JP6721699B2 - Flocculating aid and method for producing flocculating aid - Google Patents

Description

Cross-reference of related applications

This application is based on Japanese application No. 2016-187502 filed on Sep. 26, 2016, the description of which is incorporated herein by reference.

The present disclosure discloses waste water collected by vacuum suction of residues such as food wastes and fats and oils accumulated in grease traps, which are obligatory to be installed in commercial kitchens, together with water (hereinafter referred to as grease trap waste water). There is a coagulant aid added for purification.

Conventionally, in commercial kitchens, etc., a grease trap is installed to prevent sewage containing fats and oils, food wastes, etc. from flowing into the sewage as it is, but the grease traps block oils and foods wastes. (For example, refer to Patent Document 1). For this reason, it is necessary to periodically remove the oil and fat components and residues accumulated by blocking the grease trap. Therefore, as described above, the oil and fat accumulated in the grease trap and the residue are collected by vacuum suction together with water.

However, the grease trap wastewater collected in this manner contains edible oils and fats, salt, a surfactant, melanazine, amine and sludge, and it is extremely difficult to remove the emulsified edible oils and fats.
Therefore, the present inventors have conventionally studied to add and purify mineral trap minerals such as montmorillonite and bentonite to the grease trap wastewater in order to effectively remove the emulsified edible oils and fats from the grease trap wastewater. I went.

Here, a wastewater treatment method is known in which minerals such as montmorillonite and bentonite are added to wastewater containing an emulsion, and the emulsion is adsorbed on the mineral particles to remove it (see, for example, Patent Document 1).
Also, regarding grease trap wastewater, edible oils and fats can be prepared by adding a mineral-based inorganic substance together with a polymer coagulation aid for removing suspended solids other than oils and fats, or by forming a floc of mineral particles. It has been known that the content of normal hexane extract, which serves as an index of the content of the compounds, can be greatly reduced (for example, refer to Patent Document 2).

By the way, it is considered that the reduction of the content of the normal hexane extractable substance by the mineral-based inorganic substance is largely contributed by the swollen particles generated by the water absorption and swelling of the mineral particles. That is, it is considered that the swollen particles of minerals have a high adsorption capacity for edible oils and fats in wastewater, and that the adsorption capacity of the swollen particles can significantly reduce the normal hexane extractable substance content.

However, the mineral particles absorb water and swell until saturated with water. For this reason, if too much mineral-based inorganic material is added, the fluidity of the wastewater is impaired and the treatment of the wastewater is hindered. Further, after the adsorption treatment with the mineral particles, and after the water is further separated from the wastewater, the swollen particles of the mineral contain a large amount of absorbed water, and the water is removed from the swollen particles in the residue. Becomes difficult. For this reason, there is a limit to the amount of addition of the mineral type inorganic substance, and as a result, there is also a limit to the reduction of the content of the normal hexane extractable substance by the mineral type inorganic substance.

JP, 2007-029770, A JP, 2014-124594, A

The present disclosure has been made to solve the above problems, and an object thereof is to purify a grease trap wastewater using an adsorption effect of oils and fats by mineral particles, and a problem associated with water absorption swelling of mineral particles ( It is to achieve further reduction of the normal hexane extractable substance content in the waste water while suppressing the decrease in the fluidity of the waste water and the large amount of water contained in the swollen particles of the residue).

The coagulation aid of the reference example of the present disclosure is to add oils and fats accumulated in the grease trap and the residue together with water to the grease trap wastewater. The coagulation aid is an inorganic coagulation aid containing one or more inorganic substances selected from sericite, montmorillonite, bentonite and calcined vermiculite, and a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid. Equipped with.

As a result of intensive studies to solve the above problems, the present disclosure has revealed that one or more inorganic substances selected from sericite, montmorillonite, bentonite, and calcined vermiculite, and a dialkylaminoalkyl acrylate-based cation-based compound. by the combined use of molecular flocculation aid it was Heading that can solve the above problems.

That is, by using a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid having a high adsorption ability for oils and fats in combination with a mineral-based inorganic material, compared to the conventional case where only a mineral-based inorganic material is used, It was possible to realize further reduction of the content of normal hexane extract.
Further, by using the dialkylaminoalkyl acrylate-based cationic polymer coagulation aid and the mineral-based inorganic material in combination, it is possible to reliably reduce the normal hexane extractable substance content even if the addition amount of the mineral-based inorganic material is suppressed. Therefore, it is possible to suppress the problems associated with water absorption and swelling of mineral particles.

According to the first and second aspects of the present disclosure, the coagulation aid comprises an inorganic coagulation aid containing a modified inorganic substance as described below.
That is, the modified inorganic material is one obtained by modifying sericite and one or more inorganic materials selected from montmorillonite, bentonite, titanium oxide pigments and calcined vermiculite with a silane coupling agent.

Accordingly, similarly to the reference example of the present disclosure, in the purification treatment of the grease trap wastewater using the adsorption effect of oils and fats by the mineral particles, the normal hexane extraction in the wastewater is performed while suppressing the problem associated with the water absorption and swelling of the mineral particles. A further reduction of the substance content can be achieved.
Here, although the mechanism by which the modified inorganic substance solves the above problems is not clear, it can be considered as follows.

That is, sericite is a layered silicate mineral, and water easily enters between layers, and the specific surface area is easily expanded. In addition, it is considered that the one obtained by modifying the sericite with a silane coupling agent has an increased surface area due to the modification reaction, and further that a hydrophobic group and a hydrophilic group specific to silicon are mixed on the expanded surface. To be Therefore, it is considered that the uptake of emulsified fats and oils by sericite can be increased while suppressing water absorption, and as a result, while suppressing excessive water absorption of the inorganic coagulation aid, normal hexane is used. A further reduction of the extractable substance content can be achieved.

The titanium oxide pigment is a titanium oxide particle whose surface is coated with SiO 2, alumina, or aluminum hydroxide, and is inexpensive. Further, as the coagulation aid, one having a titanium oxide content in the titanium oxide pigment of 80 to 95 wt% is preferable.
In addition, the calcined vermiculite is obtained by firing a vermiculite at a high temperature (for example, 800° C. or higher) and expanding it.

According to the third and fourth aspects of the present disclosure, the coagulation aid comprises the following modified organic material. That is, the modified organic material is one or more organic materials selected from glucomannan, alginate and guar soybean enzymatic degradation product modified with a silane coupling agent.
This makes it possible to remove the coloring component (eg, melanodine) contained in the grease trap wastewater by utilizing the ability of the glucomannan, the alginate, and the enzymatic decomposition product of guar beans to remove the coloring component. Further, if these organic substances are used without being modified by the silane coupling agent, the viscosity becomes high and the fluidity of the waste water deteriorates. On the other hand, by using the modified organic substance, the fluidity of the wastewater can be improved.

Also, glucomannan, alginate and guar beans enzymatic decomposition products are biodegradable, and rapid decomposition in the residue can be expected.
Furthermore, alginate is preferable when the residue is used as compost, and glucomannan and guar enzyme decomposition products are preferable when it is necessary to remove heavy metals such as arsenic.

According to the fifth aspect of the present disclosure, the modified inorganic material is a porous granule having a water content of 0.1 to 5.0% by weight, a bulk specific gravity of 0.5 to 2.0 g/ml, and an average particle size. The diameter is 0.5 to 2.0 mm.
As a result, the modified inorganic substance can be mixed well with the wastewater, and after mixing, the dispersibility of the modified inorganic substance in the wastewater can be kept good and sedimentation or floating of the modified inorganic substance can be prevented.

According to the sixth aspect of the present disclosure, the modified organic material is a porous granule having a water content of 0.1 to 5.0% by weight, a bulk specific gravity of 0.5 to 2.0 g/ml, and an average particle size. The diameter is 0.5 to 2.0 mm.
As a result, the modified organic substance can be mixed well with the wastewater, and after mixing, the dispersibility of the modified organic substance in the wastewater can be kept good and sedimentation or floating of the modified organic substance can be prevented.

According to a seventh aspect of the present disclosure, the silane coupling agent is vinyltrimethoxysilane, vinyltriethoxysilane, 3-(2-aminoethyl)aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and 3- It is one or more silane compounds selected from aminopropyltrihydroxysilane.
As a result, the modified inorganic material or modified organic material can be reliably obtained.

According to the eighth aspect of the present disclosure, the coagulation aid comprises a polyacrylic acid ester-based cationic polymer coagulation aid and a polyacrylamide-based anionic polymer coagulation aid.
As a result, even minute particles other than oils and fats can be aggregated and separated.

According to the ninth aspect of the present disclosure, a method for producing an aggregation aid includes the following pulverization step and modification step. First, in the pulverizing step, alcohol is added to the agglomerate of sericite to be pulverized, and the pulverized sericite is dispersed in alcohol. In the modification step, a silane coupling agent and hydrogen peroxide solution are added to a mixture of sericite that has undergone the crushing step, one or more selected inorganic materials, and alcohol to produce a modified inorganic material.

First, by adding alcohol and crushing in the crushing step, it becomes easier to crush the agglomerates of sericite as compared with the case of adding water and crushing.
Further, by adding hydrogen peroxide solution in the modification step, the reaction between the inorganic substance containing sericite and the silane coupling agent can be dramatically accelerated, and further, the drying by the heat of reaction can be accelerated. Therefore, labor saving in the modification step and the drying step can be achieved. Further, since porosification and granulation can be promoted during the reaction, labor saving can be achieved also with respect to porosification and granulation of the coagulation aid.

According to the tenth aspect of the present disclosure, in the modification step, the selected one or more organic substances are contained in the mixture, and the modified organic substance is generated by the addition of the silane coupling agent and the hydrogen peroxide solution. Then, the selected one or more organic substances are mixed in advance with the mixture before the denaturing step.

First, by adding a silane coupling agent and hydrogen peroxide solution to a mixture containing an organic substance, the reaction or interaction between the organic functional group and the organic substance can be promoted by the silane coupling treatment. Further, the modified organic substance can be efficiently produced by impregnating the organic substance with alcohol in advance. Furthermore, since the organic material can be mixed with the inorganic material containing sericite before the modification step, a coagulation aid containing both the modified inorganic material and the modified organic material can be efficiently produced.

According to an eleventh aspect of the present disclosure, the alcohol is ethanol.
Among alcohols, use of methanol is not preferable, and alcohol having more carbon atoms than ethanol is expensive. In addition, by using bioethanol as the ethanol, for example, it is possible to easily crush the agglomerates of sericite at low cost.

According to the twelfth aspect of the present disclosure, the method for producing a flocculation aid comprises a washing step of washing the product obtained in the denaturing step, and in the washing step, the product is washed with saline.
As a result, it is possible to remove unreacted silane coupling agents, fine particles having a too small particle size among the products, and unporous materials having insufficient porosity.

According to the thirteenth aspect of the present disclosure, the method for producing a coagulation aid includes a drying step of drying the product after the washing step, and microwave is used in the drying step.
As a result, water and volatile components can be efficiently evaporated from the washed product, and the modified inorganic substance can be surely made porous. In addition, it is possible to promote the formation of porosity by the physical action of the boiling of the volatile component containing water, thereby promoting the expansion of the surface area. Furthermore, it is possible to prevent the burning-out of the organic component which may occur when the heater is used in the drying step.

It is a photograph which shows the coagulant|assistant agent of a 2nd Example. 4 is a photograph showing the formation state of flocs in Test 1. 9 is a photograph showing the formation state of flocs in Test 2. 9 is a photograph showing the formation state of flocs in Test 3. 9 is a photograph showing the formation state of flocs in Test 4. 9 is a photograph showing the formation state of flock in Test 5. 9 is a photograph showing the formation state of flock in Test 6.

Hereinafter, modes for carrying out the invention will be described.
First, the coagulant aid of the reference example is to add oils and fats accumulated in the grease trap and the residue to the grease trap wastewater collected together with water, and can be suitably used for coagulating the grease trap wastewater. ..

Further, the coagulation aid of the reference example is an inorganic coagulation aid containing one or more inorganic substances selected from sericite, montmorillonite, bentonite and calcined vermiculite, and a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid. And an agent.

In the purification of grease trap wastewater using the adsorption effect of oils and fats by mineral particles, the present disclosure further suppresses the normal hexane extractable substance content in wastewater while suppressing the problems associated with water swelling of mineral particles. In order to achieve As a result, in combination with one or more inorganic substances selected from sericite, montmorillonite, bentonite and calcined vermiculite, and a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid, the water absorption and swelling of mineral particles can be improved. It has been found that it is possible to achieve further reduction of the normal hexane extractable substance content in the wastewater while suppressing the problems involved.

That is, by using a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid having a high adsorption ability for oils and fats in combination with a mineral-based inorganic material, compared to the conventional case where only a mineral-based inorganic material is used, It was possible to realize further reduction of the content of normal hexane extract.
Further, by using the dialkylaminoalkyl acrylate-based cationic polymer coagulation aid and the mineral-based inorganic material in combination, it is possible to reliably reduce the normal hexane extractable substance content even if the addition amount of the mineral-based inorganic material is suppressed. Therefore, it is possible to suppress the problems associated with water absorption and swelling of mineral particles.

When bentonite is used as the inorganic substance, for example, Na-type bentonite containing sodium-type montmorillonite as a main component is preferably used, and above all, Na-type bentonite produced in Wyoming, USA is preferably used.

この化学構造式において、Ｒ１は、メチル基または水素原子を示し、Ｒ２は炭素数１〜４のアルキル基を示し、ｎは２〜４の数を示す。In addition, it is preferable to use a tertiary salt or a quaternary salt of dialkylaminoalkyl(meth)acrylate as the dialkylaminoalkyl acrylate-based cationic polymer aggregation aid. The general chemical structural formula of the dialkylaminoalkyl(meth)acrylate-based polymer coagulation aid is as follows.

In this chemical structural formula, R1 represents a methyl group or a hydrogen atom, R2 represents an alkyl group having 1 to 4 carbon atoms, and n represents a number of 2 to 4.

Further, it is preferable that the aggregation aid of the reference example contains a polyacrylic acid ester-based cationic polymer aggregation assistant and a polyacrylamide-based anionic polymer aggregation assistant.
As a result, even minute particles other than oils and fats can be aggregated and separated.
According to the coagulation aid of the reference example , the order of adding the components to the wastewater is as follows: inorganic coagulation aid → dialkylaminoalkyl acrylate-based cationic polymer coagulation aid → polyacrylic acid ester-based cation system Polymer coagulation aid→Polyacrylamide-based anionic polymer coagulation aid is preferred.

Actual embodiments with a coalescing aid comprises an inorganic flocculation aid containing modified inorganic material such as:.
That is, the modified inorganic material is one obtained by modifying sericite and one or more inorganic materials selected from montmorillonite, bentonite, titanium oxide pigments and calcined vermiculite with a silane coupling agent.

Thereby, similar to the reference example , in the purification treatment of the grease trap wastewater utilizing the adsorption effect of oils and fats by the mineral particles, while suppressing the problems associated with the water absorption swelling of the mineral particles, the normal hexane extract substance content in the wastewater Can be achieved.
Here, although the mechanism by which the modified inorganic substance solves the above problems is not clear, it can be considered as follows.

That is, sericite is a layered silicate mineral, and water easily enters between layers, and the specific surface area is easily expanded. In addition, it is considered that the one obtained by modifying the sericite with a silane coupling agent has an increased surface area due to the modification reaction, and further that a hydrophobic group and a hydrophilic group specific to silicon are mixed on the expanded surface. To be Therefore, it is considered that the uptake of emulsified fats and oils by sericite can be increased while suppressing water absorption, and as a result, while suppressing excessive water absorption of the inorganic coagulation aid, normal hexane is used. A further reduction of the extractable substance content can be achieved.

When bentonite is used as the inorganic substance modified by the silane coupling agent, for example, Na-type bentonite containing sodium-type montmorillonite as a main component is preferably used.

The titanium oxide pigment is a titanium oxide particle whose surface is coated with SiO 2, alumina, or aluminum hydroxide, and is inexpensive. Further, as the coagulation aid, one having a titanium oxide content in the titanium oxide pigment of 80 to 95 wt% is preferable.
Further, the calcined vermiculite is obtained by firing calculus at a high temperature (for example, 800° C. or higher) to expand it.

Further, the actual embodiments with a flocculating aid, it is preferable to contain the modified organic as follows.
That is, the modified organic substance is a substance obtained by modifying one or more organic substances selected from glucomannan, alginate, and guar soybean enzyme decomposition products with a silane coupling agent.

This makes it possible to remove the coloring component (eg, melanodine) contained in the grease trap wastewater by utilizing the ability of the glucomannan, the alginate, and the enzymatic decomposition product of guar beans to remove the coloring component. Further, if these organic substances are used without being modified by the silane coupling agent, the viscosity becomes high and the fluidity of the waste water deteriorates. On the other hand, by using the modified organic substance, the fluidity of the wastewater can be improved.

Also, glucomannan, alginate and guar beans enzymatic decomposition products are biodegradable, and rapid decomposition in the residue can be expected.
Furthermore, alginate is preferable when the residue is used as compost, and glucomannan and guar enzyme decomposition products are preferable when it is necessary to remove heavy metals such as arsenic.

Also relates to the physical properties of the actual embodiments with a flocculation aid, preferably limited as follows.
That is, the modified inorganic substance is made into porous granules having a water content of 0.1 to 5.0% by weight, a bulk specific gravity of 0.5 to 2.0 g/ml, and an average particle diameter of 0.5 to 2.0 mm. Preferably.
As a result, the modified inorganic substance can be mixed well with the wastewater, and after mixing, the dispersibility of the modified inorganic substance in the wastewater can be kept good and sedimentation or floating of the modified inorganic substance can be prevented.

Also, regarding the modified organic substance, it is made into porous granules, the water content is 0.1 to 5.0% by weight, the bulk specific gravity is 0.5 to 2.0 g/ml, and the average particle diameter is 0.5 to 2.0 mm. Is preferred.
As a result, the modified organic substance can be mixed well with the wastewater, and after mixing, the dispersibility of the modified organic substance in the wastewater can be kept good and sedimentation or floating of the modified organic substance can be prevented.

Further, as the silane coupling agent, it is preferable to use one or more selected from the following silane compounds. That is, one or more silane compounds selected from vinyltrimethoxysilane, vinyltriethoxysilane, 3-(2-aminoethyl)aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and 3-aminopropyltrihydroxysilane. Is preferably selected and used.
As a result, the modified inorganic material or modified organic material can be reliably obtained.

Furthermore, with regard actual embodiments with a flocculation aid, like the reference example, a polyacrylic acid ester based cationic polymer coagulant aid, that include a polyacrylamide-based anionic polymer flocculant aid preferable.
As a result, even minute particles other than oils and fats can be aggregated and separated.

[Method of manufacturing the actual embodiments with the coalescing aid]
Actual embodiments with the flocculating aid is manufactured through pulverizing step as follows, denaturation step, the washing and drying steps.
First, in the pulverizing step, alcohol is added to the agglomerate of sericite to be pulverized, and the pulverized sericite is dispersed in the alcohol.
By adding alcohol and crushing in the crushing step, it becomes easier to crush the agglomerates of sericite as compared with the case of adding water and crushing.

The alcohol used in the crushing step is preferably ethanol.
Among alcohols, use of methanol is not preferable, and alcohol having more carbon atoms than ethanol is expensive. It is preferable to use ethanol containing 2.5 to 5% by weight of water instead of absolute ethanol. Note that, for example, bioethanol is inexpensive as ethanol.

Next, in the modification step, a silane coupling agent and hydrogen peroxide solution are added to a mixture of the sericite that has undergone the crushing step, the selected inorganic material or inorganic materials, and alcohol to produce a modified inorganic material. In the modification step, while promoting hydrolysis of the silane coupling agent, formation of hydrogen bond between the silanol group obtained by hydrolysis and the hydroxyl group on the surface of the inorganic substance, further progresses, and between the silanol group and hydroxyl group. The dehydration condensation reaction promotes the formation of stronger covalent bonds.

Further, in the modification step, it is preferable to add a silane coupling agent and hydrogen peroxide solution to the mixture of sericite, the inorganic material other than sericite, and the alcohol which have been subjected to the pulverizing step.
By adding aqueous hydrogen peroxide in the modification step, the reaction between the inorganic substance containing sericite and the silane coupling agent can be dramatically accelerated, and further the drying by the heat of reaction can be accelerated. Therefore, labor saving in the modification step and the drying step can be achieved. Further, since porosification and granulation can be promoted during the reaction, labor saving can be achieved also with respect to porosification and granulation of the coagulation aid.

When the flocculating aid contains a modified organic substance, it is preferable to mix the organic substance with a mixture containing alcohol and sericite in advance before the modifying step.
By adding the silane coupling agent and hydrogen peroxide solution to the mixture containing the organic substance, the reaction or interaction between the organic functional group and the organic substance can be promoted by the silane coupling treatment. Further, the modified organic substance can be efficiently produced by impregnating the organic substance with alcohol in advance. Furthermore, since the organic material can be mixed with the inorganic material containing sericite before the modification step, a coagulation aid containing both the modified inorganic material and the modified organic material can be efficiently produced.

Next, the washing step is a step of washing the product obtained in the denaturing step, and it is preferable to wash the product with saline in the washing step.
By using the saline solution, it is possible to remove unreacted silane coupling agent, fine particles having a too small particle size among the products, and non-porous material having insufficient porosity.

Further, the drying step is a step of drying the product after the washing step, and microwave is used in the drying step.
As a result, it is possible to efficiently evaporate the water and the volatile components from the product after washing and surely make the flocculation aid porous. In addition, it is possible to promote the formation of porosity by the physical action of the boiling of the volatile component containing water, thereby promoting the expansion of the surface area. Furthermore, it is possible to prevent the burning-out of the organic component which may occur when the heater is used in the drying step.
Hereinafter, examples of the present coagulation aid will be described. Needless to say, the present disclosure is not limited to the coagulation aids in the examples.

[ Reference example ]
The coagulation aid of the reference example is bentonite as an inorganic coagulation aid, a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid, a polyacrylic acid ester-based cationic polymer coagulation aid, and a polyacrylamide-based coagulation aid. Of an anionic polymer coagulation aid. Then, the following tests A and B were performed using the aggregation aid of such a reference example and the aggregation aid of the first comparative example.

That is, in Test A, the coagulation aid of Reference Example was added to the raw water of the grease trap wastewater, and the properties of the wastewater after addition were confirmed. Further, Test B is one in which the coagulant aid of the first comparative example was added to the raw water of the grease trap wastewater, and the properties of the wastewater after the addition were confirmed.
The coagulation aid of the first comparative example does not include a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid among the components constituting the coagulation aid of the reference example , and is used as an inorganic coagulation aid. Bentonite, a polyacrylic acid ester-based cationic polymer coagulation aid, and a polyacrylamide-based anionic polymer coagulation aid.

In addition, as the components of the coagulation aid used in the reference example and the first comparative example, commercially available products were used.
For the bentonite, Na-type bentonite manufactured in Wyoming, USA is used for both the reference example and the first comparative example, and the dialkylaminoalkyl acrylate-based cationic polymer coagulant aid is dialkylaminoalkyl (meth). ) Those having a quaternary salt of acrylate as a main component were used.

The tests A and B will be described below.
In tests A and B, bentonite as an inorganic coagulation aid was dispersed in water to prepare a water slurry of about several wt %, and a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid, polyacrylic acid ester-based Each of the cationic polymer coagulation aid and the polyacrylamide anion polymer coagulation aid of 1 was individually dispersed in water to prepare a water slurry of less than 1 wt %. Then, these water slurries were individually added to the raw water of the grease trap wastewater.

That is, in test A, bentonite, a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid, a polyacrylic acid ester-based cationic polymer coagulation aid, and a polyacrylamide-based solution were added to 1 liter of raw water of the grease trap wastewater. After adding and adding several drops of water slurry of each of the anionic polymer coagulation aids, the flocs were removed by filtration, and the properties of the treated wastewater were analyzed.

Similarly, in the test B, water slurries of bentonite, polyacrylic acid ester-based cationic polymer coagulation aid, and polyacrylamide-based anionic polymer coagulation aid were added to 1 liter of raw water of the grease trap wastewater. After a few drops were added and the flocculation treatment was performed, flocs were removed by filtration, and the properties of the treated wastewater were analyzed.
The analysis items and the analysis method are as shown in Table 1.

In both the reference example and the first comparative example, all the items and the raw water of the grease trap wastewater are greatly improved. In addition, by using a dialkylaminoalkyl acrylate-based cationic polymer coagulation aid as in the coagulation aid of the reference example , the normal hexane extractable substance content is increased compared to the coagulation aid of the first comparative example. It could be reduced to less than 1 ppm.
In Tests A and B, anhydrous potassium aluminum sulfate was added together with the above coagulant aid.

[ First Embodiment]
The coagulant aid of the first example is composed of a modified inorganic material obtained by modifying both sericite and bentonite with 3-aminopropyltriethoxysilane and vinyltrimethoxysilane.
Then, such a first embodiment of a flocculation aid, and were subjected to the following tests 1 to 4 with a coalescing aid of the second comparative example.

That is, Test 1 is to confirm the formation state of flocs by adding the coagulation aid of the first example to the model wastewater, and Test 2 is the coagulation aid of the second comparative example to the model wastewater. It was added to confirm the formation state of flocs. In addition, Test 3 is one in which the flocculation aid of the first example is added to the model wastewater and the floc formation state and the properties of the wastewater after the addition are confirmed. 2 shows the floc formation state by adding the coagulation aid of Comparative Example 2 and the properties of the waste water after the addition.

Next, before describing Tests 1 to 4, the method for producing the modified inorganic material of the first embodiment will be described.
In addition, all the various inorganic substances and silane coupling agents used for the production of modified inorganic substances are commercially available.

The modified inorganic material of the first example is obtained through the following pulverization step, modification step, washing step and drying step.
First, in the crushing step, 60 g of bentonite powder and 50 g of agglomerates of sericite were added as inorganic substances to 20 g of ethanol, and the whole agglomerates of sericite were crushed while stirring the whole. Thereby, a mixture of bentonite, sericite and ethanol was obtained.

Here, Na-type bentonite from Wyoming, USA was used as the bentonite, and Otoge from Yamagata Prefecture was used as the sericite. In addition, as the ethanol, those having a pure ethanol content of 95.1 to 96.9 wt% (most of the components other than pure ethanol are water) were used.

Next, in the modification step, 15 g of 3-aminopropyltriethoxysilane and 15 g of vinyltrimethoxysilane were added as silane coupling agents to the total amount of the mixture obtained in the pulverization step, and further 30 wt% hydrogen peroxide was added. 10 g of water was added to promote hydrolysis of the silane coupling agent and chemical bond between the hydrolyzed silane coupling agent and the inorganic substance to obtain a granular and porous solid substance containing the modified inorganic substance.
It should be noted that 10 g of hydrogen peroxide water was added together with the silane coupling agent in two stages, 5 g at the start of the reaction and 5 g after 5 minutes.

Next, in the washing step, the solid matter obtained in the denaturing step is put into a draining net and washed by rubbing in saturated saline, and then drained to remove the unreacted silane coupling agent, and the particle size among the products. Too small fine substances and non-porous substances that were insufficiently made porous were removed.
Further, in the drying step, the solid matter remaining on the draining net was taken out and dried by microwave.

The modified inorganic substance of the first example obtained as described above had a water content of 3.4% by weight, a bulk specific gravity of 1.4 g/ml, and an average particle size of 4 mm.
In addition, the water content was measured using an infrared moisture meter FD-660 manufactured by Kett Scientific Laboratory Co., Ltd. Further, the bulk specific gravity is obtained by measuring the mass of the powder of the predetermined amount of the coagulation aid, and further measuring the volume by filling the graduated cylinder with the total amount of the coagulation aid measured and measuring the volume by reading the grain surface from the scale. It was calculated by dividing by the volume. Further, the average particle size was measured by a sieving method.
In addition, a photograph of the inorganic modified product of the first embodiment, that is, a photograph of the solid after microwave drying, is attached to FIG.

Hereinafter, coalescing aids in the first embodiment, and the test 1-4 using the flocculating aid of the second comparative example will be described. Tests 1 to 4 are for confirming the floc formation state by adding the coagulation aid to the model wastewater as described above.
Here, the aggregation aid of the second comparative example is bentonite similar to that of the first comparative example.
The model waste water was prepared by adding 0.5 g of salt, 3 g of edible oil and 1 g of a fatty acid alkanol as a surfactant to 500 ml of tap water and stirring.

In Test 1, anhydrous potassium aluminum sulfate was added together with the modified inorganic substance which is the coagulation aid of the first example, and in Test 2, anhydrous potassium aluminum sulfate was added together with bentonite which is the coagulation aid of the second comparative example. ..
Further, in Test 3, anhydrous potassium aluminum sulfate and polymer coagulation aid were added together with the coagulation aid of the first example, and in Test 4, anhydrous potassium aluminum sulfate and high coagulant were added together with the coagulation aid of the second comparative example. A molecular aggregation aid was added.

The polymer coagulation aid is a polyacrylic acid ester-based cationic polymer coagulation aid.
In addition, the mass of the coagulation aid of the first example and the second comparative example used in Tests 1 to 4, the mass of anhydrous potassium aluminum sulfate, and the mass of the polymer coagulation aid are as described in Table 2. Is.

The formation states of the flocs in Tests 1 to 4 are shown in FIGS. 2 to 5, respectively.
First, in the case where the polymer coagulation aid was not used in combination, the floc formation state was compared between the coagulation aid of the first example and the coagulation aid of the second comparative example (Tests 1 and 2 in Table 2, 2 and 3), the coagulation aid of the first example (FIG. 2) is clearly clearer than the coagulation aid of the second comparative example (FIG. 3), and is slightly It is difficult to understand, but the expansion of flocs, that is, the water absorption of the coagulation aid is suppressed.

Next, regarding the case where a polymer coagulation aid is used in combination, the floc formation state is compared between the coagulation aid of the first example and the coagulation aid of the second comparative example (Tests 3 and 4 in Table 2). , And FIG. 4 and FIG. 5), the flocculation aid of the first example (FIG. 4) is larger than the flocculation aid of the second comparative example (FIG. 5), that is, the flocs are enlarged, that is, It is clearly understood that the water absorption of the coagulation aid is suppressed.

Further, according to the same formulation as in Tests 3 and 4, 500 ml of model wastewater was subjected to coagulation treatment, then flocs were removed by filtration, and the properties of the treated wastewater were analyzed.
The analysis items and analysis methods are as shown in Table 3.

In both the first example and the second comparative example, all items and the model wastewater are greatly improved. Further, by using a modified inorganic substance like the coagulation aid of the first example, the normal hexane extractable substance content is reduced from 2 ppm to less than 1 ppm as compared with the coagulation aid of the second comparative example. I was able to.

[ Second Embodiment]
The coagulation aid of the second example is a modified inorganic substance obtained by modifying both sericite and bentonite with 3-aminopropyltriethoxysilane and vinyltrimethoxysilane, and glucomannan with 3-aminopropyltriethoxysilane and vinyl. It is composed of a modified organic substance modified with trimethoxysilane.

Then, the following tests 5 and 6 were performed using the aggregation aid of the second example and the aggregation aid of the third comparative example.
That is, Test 5 is to confirm the floc formation state by adding the coagulant aid of the second example to the raw water of the grease trap wastewater, and Test 6 is the third comparison to the raw water of the grease trap wastewater. The flocculation state was confirmed by adding the flocculation aid of the example.

Next, before describing Tests 5 and 6, a method for producing a modified inorganic material and a modified organic material of the second embodiment will be described.
The modified inorganic substance and the modified organic substance of the second example are obtained through the following pulverizing step, mixing step, denaturing step, washing step and drying step. The steps other than the mixing step are the same as those of the modified inorganic substance of the first embodiment. Moreover, all the various organic substances used for the production of the modified organic substances are commercially available.

In the mixing step, 5 g of glucomannan was mixed with the mixture of bentonite, sericite and ethanol obtained in the crushing step. Then, in the modification step, a mixture of bentonite, sericite, ethanol and glucomannan was subjected to the same formulation as in the first example to obtain a granular and porous solid substance containing a modified inorganic substance and a modified organic substance.

The aggregation aid of the second example obtained as described above had a water content of 3.4% by weight, a bulk specific gravity of 1.4 g/ml, and an average particle size of 4 mm.
The methods for measuring the water content, bulk specific gravity and average particle diameter are the same as in the first embodiment.

Hereinafter, Tests 5 and 6 using the coagulation aid of the second example and the coagulation aid of the third comparative example will be described. In Tests 5 and 6, the flocculation state was confirmed by adding the flocculation aid to the raw water of the grease trap wastewater as described above.
Here, the coagulation aid of the third comparative example is bentonite similar to the first and second comparative examples.

Test 5 is the addition of anhydrous potassium aluminum sulfate and a polymeric coagulation aid together with the modified inorganic and modified organics that are the coagulation aid of the second example, and Test 6 is the coagulation aid of the third comparative example. Anhydrous potassium aluminum sulphate and a polymeric flocculant were added along with bentonite.

The same anhydrous potassium aluminum sulfate and polymer coagulation aid as those used in Tests 1 to 4 were used.
In addition, the mass of the coagulation aid of the second example and the third comparative example used in tests 5 and 6, the mass of anhydrous potassium aluminum sulfate, and the mass of the polymer coagulation aid are as shown in Table 4. These were added to 500 milliliters of grease trap wastewater in Tests 5 and 6 respectively.

The states of formation of the flocs in tests 5 and 6 are shown in FIGS. 6 and 7, respectively.
From the comparison between FIG. 6 and FIG. 7, it can be clearly seen that the expansion of flocs, that is, the water absorption of the coagulation aid is suppressed even when both the modified inorganic substance and the modified organic substance are contained.

[Modification]
Although the present disclosure has been described based on the embodiments, the present disclosure is not limited to the embodiments and includes various modifications. For example, an unmodified inorganic substance that has not been modified by a silane coupling agent, and a modified inorganic substance may both be included in the coagulation aid, and aggregated by the unmodified inorganic substance and the modified organic substance of sericite, montmorillonite, bentonite, and calcined vermiculite. You may comprise an auxiliary agent.

The coagulation aid of the present disclosure can be suitably used for coagulation treatment of grease trap wastewater.

Claims (13)

A coagulant aid that is added to grease trap wastewater that collects oils and fats accumulated in the grease trap and residue together with water,
Sericite and, montmorillonite, bentonite, coalescing aids comprise inorganic flocculation aid containing modified modified inorganic by one or more inorganic and silane coupling agent selected from among titanium oxide pigments and fired Bamiki Yuraito. A coagulant aid that is added to grease trap wastewater that collects oils and fats accumulated in the grease trap and residue together with water,
And an inorganic flocculating aid including sericite, montmorillonite, one or more inorganic materials were selected from among bentonite and firing vermiculite,
With a dialkylaminoalkyl acrylate-based cationic polymer aggregation aid,
Furthermore, the inorganic coagulation aid is
An agglutination aid containing a modified inorganic substance obtained by modifying sericite and one or more inorganic substances selected from montmorillonite, bentonite, titanium oxide pigments and calcined vermiculite with a silane coupling agent. A coagulant aid that is added to grease trap wastewater that collects oils and fats accumulated in the grease trap and residue together with water ,
And an inorganic flocculating aid including sericite, montmorillonite, one or more inorganic materials were selected from among bentonite and firing vermiculite,
A dialkylaminoalkyl acrylate-based cationic polymer aggregation aid,
Glucomannan, coalescing aids and a modified organic substance modified by one or multiple organic silane coupling agent selected from alginate and guar bean enzymatic decomposition product. The coagulation aid according to claim 1 or 2 , wherein
An agglutination aid comprising a modified organic substance obtained by modifying one or more organic substances selected from glucomannan, alginate and guar bean enzymatic degradation products with a silane coupling agent. The coagulation aid according to claim 1 or 2 , wherein
The modified inorganic substance is a porous granule having a water content of 0.1 to 5.0% by weight, a bulk specific gravity of 0.5 to 2.0 g/ml, and an average particle diameter of 0.5 to 2.0 mm. Is a coagulant aid. The coagulation aid according to claim 3 or 4, wherein
The modified organic material is a porous granule having a water content of 0.1 to 5.0% by weight, a bulk specific gravity of 0.5 to 2.0 g/ml, and an average particle diameter of 0.5 to 2.0 mm. Is a coagulant aid. In flocculation aid according to any one of the claims 1 to 6,
The silane coupling agent is selected from vinyltrimethoxysilane, vinyltriethoxysilane, 3-(2-aminoethyl)aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and 3-aminopropyltrihydroxysilane. A coagulation aid which is one or more silane compounds. The coagulation aid according to any one of claims 1 to 7, wherein
A polyacrylic acid ester-based cationic polymer aggregation aid,
A coagulant aid comprising a polyacrylamide-based anionic polymer coagulant aid. Equipped with an inorganic coagulation aid containing a modified inorganic substance obtained by modifying a sericite and one or more inorganic substances selected from montmorillonite, bentonite, a titanium oxide pigment, and calcined vermiculite with a silane coupling agent,
In the method for producing a coagulant aid which is added to grease trap wastewater in which oils and residues accumulated in the grease trap and residue are collected together with water,
A grinding step of adding alcohol to the agglomerates of sericite and grinding, and dispersing the ground sericite in this alcohol,
Aggregation comprising a step of adding a silane coupling agent and aqueous hydrogen peroxide to a mixture of sericite that has undergone this crushing step, the selected inorganic material or inorganic materials, and the alcohol, and a modified inorganic material. Manufacturing method of auxiliary agent. The method for producing a coagulation aid according to claim 9,
The agglutination aid comprises a modified organic substance obtained by modifying one or more organic substances selected from glucomannan, alginate and guar soybean enzymatic degradation products with a silane coupling agent,
In the modification step, the selected one or more organic substances are included in the mixture, and the modified organic substances are generated by addition of a silane coupling agent and hydrogen peroxide solution,
A method for producing an agglutination aid, wherein the selected one or more organic substances are mixed in advance with the mixture before the modification step. In the method for producing a coagulation aid according to claim 9 or 10,
The method for producing a coagulation aid, wherein the alcohol is ethanol. The method for producing a coagulation aid according to any one of claims 9 to 11,
A washing step for washing the product obtained in the denaturing step,
In this washing step, a method for producing an agglutination aid, in which the product is washed with saline. The method for producing a coagulation aid according to any one of claims 9 to 12,
A washing step of washing the product obtained in the denaturing step,
A drying step of drying the product after the washing step,
In this drying step, a method of producing a coagulation aid using microwaves.

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