JPH0775720B2 - Bag-type dehydration method for sludge - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to dams, lakes, rivers, seabed sediments and sludges, pollutants, red tides, blue powders, and industrial wastewater pollutants, that is, fisheries, livestock, A liquid waste during processing of agricultural foods, or industrial liquid waste, for example, sludges such as metal sludge or slurry are treated with a purification separation treatment agent, and hydrophilic colloid particles of the sludges are hydrophobized to separate and dehydrate water molecules. The present invention relates to a bag-type dehydration treatment method for sludge, which comprises removing residual solids and separated water, and then dehydrating using a dehydration container such as a dehydration bag.

[0002]

BACKGROUND ART Sludges such as lakes, rivers, seabed sediments and industrial wastewater pollutants generally contain organic substances such as proteins, carbohydrates and fatty acids, inorganic substances and bacteria. It is composed of fine particles of an organic or inorganic substance, and these exist in a colloidal state in water, and most of them are hydrophilic, so that removal and separation thereof are difficult. Conventionally, as a method for purifying and separating sludge, which separates sludge from lakes, rivers, and seabed, "sludge", or industrial wastewater pollutants and solidifies the residue, It is a sun drying process, a method of waiting for natural dehydration until it meets the purpose of use by applying consolidation for a long period at a landfill, a mechanical dehydration process, forcibly dehydrating with a dehydration processing machine to make mud solid There is a method of chemical dehydration treatment such as coagulation-precipitation and concentration with a polymer flocculant to reduce the water content, and then treatment with lime, cement, and a solidifying agent. As a sludge treatment agent comprising a divalent or trivalent iron salt, a trivalent metal salt, a monovalent metal salt and solvent water (JP-A-62-2771).
99 No.), Al _2, FeO ₃ and SO ₃ of 3 components comprising a specific weight basic liquid inorganic coagulant comprising an aqueous solution of aluminum sulfate of iron (JP-60-14911) and the like are known, these processes Attempts have been made to use agents.

[0003]

In the above prior art,
For example, there are the following drawbacks. In the case of the sun drying process, water molecules are evaporated from the bottom mud over a wide area and over a long period of time, but during that period, there is a bad odor characteristic of the bottom mud, and when it receives rainwater or snow, it liquefies again and the bad odor is generated. Release
It is difficult to use for landfill soil. In the case of the method of mechanical dehydration, even if a large amount of money is invested, the water content is reduced by squeezing out the water from the bottom mud, and the malodor, soil quality, and water quality are not improved. In addition, since the sludge is not completely solidified, it is difficult to use it as landfill or embankment. Further, in the chemical dehydration treatment method, lime and cement are used, but these only solidify the bottom mud to facilitate the disposal and cannot improve the soil quality. Another problem is that the solidification process is affected by rainwater and spring water for a long period of time, causing alkalinity to be washed away from the treated area and deteriorating the water quality of the downstream river. And, in the case of the treatment agents listed in the above and, not only the pretreatment such as the treatment with the polymer coagulant is necessary in order to sufficiently separate the water, but the separation of the water is still unsatisfactory for a long time. In addition, it is not effective in detoxifying bacteria and heavy metals and eliminating odors, and there is a problem in that the range of utilization of the residual solids is limited.

Therefore, the bottom mud can be quickly hydrophobized, the separated water, the bacteria contained in the separated bottom mud can be sterilized, and the heavy metals can be detoxified, and the soil particles can be regenerated into the soil particles before the bottom mud. The use range is not limited, and the appearance of a method and treatment agent that can be used as landfill, embankment soil or fertilizer is desired, and industrial wastewater pollutants, that is, industrial metal sludge, or agricultural, livestock, and marine food processing. Similarly, the wastewater polluted during the process can be immediately hydrophobized,
It is expected that a separation treatment agent and a treatment method that can utilize the separated water and bacteria containing the separated solids and the detoxification of heavy metals can be used.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventor previously found that in addition to a divalent or trivalent iron salt, a trivalent metal salt, an alkaline earth metal salt. We proposed a purification separation treatment agent that can effectively purify and separate sludge consisting of an aqueous solution containing a metal salt containing as a main component, but as a result of further research, sludge was treated with the above purification separation treatment agent. The present invention has been completed by finding that sludge can be dehydrated, transported and stored very easily by using a dehydration container such as a dehydration bag for the subsequent dehydration separation.
That is, the present invention is a purification and separation treatment agent for sludges, which comprises a divalent or trivalent iron salt, a trivalent metal salt and an alkaline earth metal salt as main components, and the inorganic salt dissolved in solvent water, Alternatively, a purification / separation treatment agent for sludges obtained by further adding diphosphorus pentoxide to this is added to the sludges, or a neutralizing agent and a polymer coagulant are sequentially added to the sludges for hydrophobic separation. Then, as a dehydration container, it consists of an outer container and an inner container,
The outer storage body has a hanging tool on the top and an openable and closable tightening on the bottom.
It is a net-shaped container with tools, and the inner container removes sludge.
Do not use a bottomed cloth container for storing water, especially a non-woven cloth container.
The present invention relates to a method for purifying and dehydrating sludge, which is characterized by dehydrating using a dehydrating container .

In the sludge purification and separation treatment agent of the present invention, examples of the divalent and trivalent iron salts include ferrous sulfate, ferric sulfate and ferric chloride. Examples thereof include aluminum sulfate [Al ₂ (SO ₄ ) ₃ ], potassium aluminum sulfate [AlK (SO ₄ ) ₃ ], and the like. These metal salts are conventionally generally used as a flocculant for sludge water treatment. Examples of the alkaline earth metal salt used in the present invention include magnesium chloride (MgCl ₂ .6H ₂ O) and calcium chloride (CaC
l ₂ · 2H ₂ O) etc. These alkaline earth metal salts, such as MgCl ₂ .6H ₂ O, are used as a coagulant for tofu, a freezing agent, and a raw material for cement.
Cl ₂ is widely used as a desiccant, a calcium skeletal skeletal medicine as a medicine, and a treatment for allergic diseases. These alkaline earth metal salts are used as sludges such as bottom sludge and industrial wastewater pollutants. There is no example used as a treating agent of the present invention, the purification separation treating agent of the present invention containing this facilitates the separation of water and solids of sludges, alkaline earth metal salts and aluminum sulfate, ferric chloride, It has an excellent effect that sludges easily coagulate due to an additive effect with a coagulant such as ferric sulfate, and adsorption solidification and drying can be performed in a short time.

In the present invention, the purification / separation treatment agent can be obtained by adding diphosphorus pentoxide (P ₂ O ₅ ) to the purification / separation treatment agent. P ₂ O ₅ is known as a condensing agent, a surfactant, and a digestive / cooling agent for medical use in dehydration, gas drying, and organic chemistry, but in the present invention, this is a heavy metal of sludges, an antidote for bacteria, The present inventor has found for the first time that it acts as a bactericidal agent and also as a neutralizing agent for neutralizing alkaline to acidic.

The composition ratio of the components of the purification / separation treatment agent of the present invention is appropriately selected depending on the source of the sludge to be treated, that is, the components constituting the sludge, the particle size composition ratio, the water content, the pH, the temperature and the like. However, 50 to 30% by weight of divalent or trivalent iron salt, 3
It can be 45 to 30% by weight of a valent metal salt, 30 to 3% by weight of an alkaline earth metal salt, and 1.5 to 0.3% by weight of P ₂ O ₅ so that it can be treated effectively.

In the present invention, the solvent water of the main component is preferably at least 4 times the total weight of the other components, and it is also possible to use an amount less than this, but in that case, each chemical component must react. Therefore, the effect may be reduced. The amount of the purification and separation treatment agent used for sludge is not particularly limited, but sludge (water content 10%) 1,000 l
To 1 to 30 liters, preferably 3 to 6 liters. In treating sludge, after treatment with the purification / separation treatment agent of the present invention, the hydrogen ion concentration in water rises due to the positively charged metal salt or the like of the purification / separation treatment agent, the pH decreases, and the coagulation-coagulation reaction slows down. Therefore, the neutralizing agent calcium hydroxide [Ca
(OH) ₂ ], sodium hydroxide (NaOH), magnesium oxide (MgO) and the like to lower the hydrogen ion concentration and raise the pH so that the aggregation-condensation reaction can be carried out smoothly. These neutralizing agents are selected according to the source of sludges, and the pH is adjusted to about 6 to 8.6. Calcium hydroxide is widely used as a neutralizing agent, sodium hydroxide is strongly alkaline and is suitable for the treatment of sedimentary sludge in seawater. Also, MgO as a neutralizing agent
It also acts as an antidote because it forms an insoluble salt with arsenous acid.

In treating sludges, a polymer flocculant can be used in combination. As a result, the coagulation-condensation reaction of the sludge particles can be further promoted. Sludges rapidly form large flocs and settle due to the synergistic action with the purification and separation treatment agent. The polymer coagulant is an anion, nonion, or cation polymer coagulant, for example, anion is a polyacrylic amide type [HYMOLOCK SS500, the same OK107 (registered trademark) (Kyoritsu Organic Industry Co., Ltd.)], and nonionic is a polyacrylic amide type. Hymoloc SS200 (registered trademark) (Kyoritsu Organic Industry Co., Ltd.)],
For cations, polyacrylic amide type [Himoloc MP
173, Q101, Q105 (registered trademark) (Kyoritsu Organic Industry Co., Ltd.)] and the like are used.

The method for purifying and dehydrating sludges according to the present invention comprises:
For example, it is performed as follows. A certain amount of the purification / separation treatment agent of the present invention is added to sludge and mixed. As a result, water and solids are separated, and sludges are easily solidified and aggregated. Further, a neutralizer and then a polymer flocculant are added to the treated product to separate the flocculate from water in a sludge separation tank, and the separated solid is dehydrated with a dehydration bag to remove solid residue (separation). Get the soil). The purification / separation treatment agent of the present invention is a treatment of sedimentary mud in organic, inorganic or neutral fresh water, treatment of sedimentary mud in fresh water containing metal layer bacteria, treatment of sedimentary mud in seawater containing heavy metal bacteria, etc. It is effective for treating various kinds of bottom mud, etc. and various industrial wastewater suspended matter, that is, various industrial wastewater pollutants such as various sludges such as various metal sludges, agricultural / water / cattle breeding food processing wastewater pollutants.

[0012] Also, dehydrating storage body of the present invention is composed of a outer side container and the inner container, instrument suspending outer container at the top, a mesh container having a reclosable fastener at the bottom, An inner container for dewatering and containing the hydrous sludge mixture.
It is a container for dehydration consisting of a bottomed cloth container (Fig. 6 ,
7 , 8 and 10 ), the outer container is a tubular mesh bag (Fig.
6 , FIG. 7 ) and a cylindrical basket-shaped container (FIGS. 8 and 10 ) can be used. The basket-like container is a synthetic resin unit composed of a rectangular plate having a large number of holes forming the body of the basket, and one or more trapezoidal plates having a large number of holes at the top and bottom of the basket. One that consists of assembling multiple units by combining the units provided on both sides of the body rectangular plate (Fig. 8 ), or a rectangular plate with many holes forming the body of the basket A synthetic resin unit for forming a head portion and a bottom portion is formed by combining a plurality of units by combining portions provided on both sides of a rectangular body plate of a body of a synthetic resin unit (FIG. 10 ). ). Further, the inner container is a tubular bag made of synthetic resin continuous long-fiber non-woven fabric, a bag made of synthetic resin yarn knitting, etc. (FIGS. 4 and 5 ), which are made of a collapsible or corrosive material. Can be. It has been found that this further facilitates dehydration of the separated solid and dehydration of the solid residue, transportation and storage. The net-like material, which is the outer bag of the dehydrating container, is made of synthetic resin having a large tensile strength, such as nylon thread, if it is a tubular net-like bag. This outer bag stores the inner bag used for dehydration of the hydrophobized separation-treated product treated with the sludge purification and separation treatment agent, so the bottom is closed with a fastener. After the inner container, for example, the inner bag has been dehydrated, the bottom fastener is opened, the outer container is formed into a bottomless cylinder, and the inner bag stored is discharged.
The inner bag contains residual solid matter, and is transported and stored.
In the dehydrated container, the inner bag is capable of dehydrating and storing or storing the hydrophobized and separated product at the same time. The inner bag may be made of a non-woven cloth made of the same material as the dehydration bag. Since this inner bag has an outer bag, a non-woven cloth having a small thickness can be used, so that the dehydration efficiency can be further improved. When the outer container is basket-shaped, the inner bag can be made thinner, and the dehydration effect can be further enhanced. Further, it is preferable that the inner bag has a collapsible or corrosive container because it can be returned to the soil by dehydrating the bottom mud and placing it in the soil for a long time.

The size of the dehydration bag can be appropriately selected according to the scale of the hydrophobizing treatment of sludge. The bag-type dehydration method using the bag of the present invention is easier to collect the residual solid matter as compared with other dehydrators and those using a filtering device, and the residual solid matter is put in the bag as it is, which can be conveyed. It is very convenient because it can be used, and it is extremely efficient because the separation and recovery of residual solids can be performed in one step.

[0014]

The main component of the sludge purification and separation treatment agent of the present invention is a positively charged inorganic metal salt, which binds and neutralizes negatively charged fine particles constituting the sludge to solidify the sludge. object,
Water molecules attached around the soil fine particles and bound are separated from the particles, and due to the agglomeration / condensation reaction of solid particles, water molecules are further extruded to form flocs agglomerated into large particles. It is considered to be a thing. In particular, since the purification / separation treatment agent of the present invention contains an alkaline earth metal salt, the sludge treatment agents of this type heretofore required the treatment of the polymer flocculant as an auxiliary agent first. However, the hydrophilic colloid particles can be effectively converted into the hydrophobic colloid particles without the need for such pretreatment.
Agglomeration, adsorption and solidification to form a solid mass, and the particles can be made into a large agglomerate. In addition, it has a deodorizing effect and can remove bad odors, and sterilizes and detoxifies bacteria and heavy metals. In addition, there is no contaminant in the separated water, and the quality of the water is good. The soil from the separated bottom mud has low water retention and high water permeability, and can be used as landfill and embankment soil. The solid matter obtained from wastewater, for example, the solid matter obtained from metal sludge can be used as an additive for the ceramic industry, and various uses are possible. For example, the solid matter can be used in each field depending on the type of sludge. In the dehydration step after the sludge's hydrophobic treatment with the purification / separation treatment agent, the bag-type dehydration treatment is performed, so that the separation and collection and storage of the residual solids can be performed in one step, and the transportation of the residual solids is easy. Can be used smoothly.

[0015]

EXAMPLES The present invention will be described below with reference to examples, but it goes without saying that the present invention is not limited to these. Solvent water of the purification and separation treatment agent of the present invention used specifically 1
Table 1 shows the blending amounts (blending ratios) of the components in 1 and the order of addition of the treating agents in treating sludges. The first
In the table, Example 1 is organic, inorganic, sedimentary mud in neutral fresh water, Example 2 is sedimentary mud in fresh water containing heavy metal bacteria,
Of the comparative example (JP-A-62-27719).
(Corresponding to No. 9) is shown, and the same bottom mud as in Example 1 is treated.

The processing method is as follows. (1) Bottom mud: Put sludge such as industrial wastewater in the treatment tank,
About 2.0 to 8.0 l of the purification and separation treatment agent is added per 1.0 m ³ of the stock solution, and the mixture is stirred for 15 to 30 seconds to make it hydrophobic. By this agitation, a synergistic effect is exerted, ion exchange is performed, anaerobic bacteria are changed to aerobic, and malodor is eliminated. to this,
Add about 2.0 to 8.0 liters of neutralizing agent, stir for about 15 to 30 seconds, and p
Adjust H to within 5.8-8.6. The flocculant (cationic or anionic) is then added and stirred for about 20-30 seconds. The hydrophobized solids form aggregates and precipitate.
Further, if necessary, by adding a flocculant (anionic or nonionic) and stirring for about 30 to 60 seconds, the already formed aggregate solid matter becomes a larger aggregate (5 to 20 mm) to increase the hardness, Settle. That is, the hydrophobized aggregates increase in size and are easily dehydrated. The pH of this treated mixture is adjusted within environmental standards. Then, a dehydration bag (a bag made of a continuous long-fiber non-woven fabric of polyprepyrone or a bag knitted with a thread made of synthetic resin) is placed in a bag-filling machine, and the agglomerated water suspended matter is put therein and dehydrated. Depending on the aggregation state of the dehydrated stock solution, the dehydrated step may be performed after the above steps. The separated liquid dehydrated in the dehydration bag is discharged,
Residual solids are stored in the bag, and the bag is closed as it is, stored, and reused in various appropriate fields.

(2) In the sludge purification and dewatering apparatus shown in FIG. 1, the bottom sludge is put in the reaction tank 1 and the agitator 2 (driven by the motor 11) is stirred and the hydrophobic treatment agent is introduced into the inlet 3 more (1) Like the sediment was 1.0 m ³ per about 2.
Add 0 to 8.0 liters, stir for about 15 to 30 seconds, add a neutralizer (lucium hydroxide) and stir for about 15 to 30 seconds, pH 5.8 to
Adjust within 8.6. Next, a polymer flocculant (cationic or anionic) is mixed in, and the mixture is stirred for about 20 to 30 seconds, and the already hydrophobized solids form aggregates and precipitate. If necessary, a polymer flocculant (anionic or nonionic) is added to make the agglomerates larger, and
Stir for 30-60 seconds. The aggregates have a size of 5 to 20 mm, which facilitates dehydration. Next, the valve 4 at the lower part of the reaction tank 1 is opened, and the dehydration bag 8 is put through the mono pump 5 (driven by the motor 12) and the perforated plate 7 in the bag fixing machine 6 for dehydration. The perforated plate 7 serves to separate a large amount of water before putting it in the dehydration bag 8. The perforated plate 9 is also placed under the dehydration bag to drain the water in the bag. Dehydration in the dehydration bag 8 is performed in an extremely short time. After the dehydration is completed, the dehydration bag 8 is carried out by the movable pulley 10.

The dewatering bag 8 of the present invention is shown in FIGS. 2 to 11. This dehydration bag 8 is a dehydration bag composed of an outer storage body 8'and an inner storage body 8 ". Fig. 2 is a schematic view of the mesh outer storage body 8'in an open state, and Fig. 3 is an outer storage body 8". 'is a schematic diagram of a closed state. Matazu 4 ", and 5 the inner container 8 in the closed position" state of the inner container 8 opened a. FIG. 6 is an outer container 8' Inner storage 8 "
It is a schematic diagram at the time of putting and dehydrating. As shown in FIG. 6,
Put the inner storage body 8 ″ in the open state in the net-shaped outer storage body 8 ′, and pull the draw string 14 at the bottom of the outer storage body.
The inner container 8 ″ is stored in the outer container 8 ′ and is hung by the suspending tool 13, and the purified water-containing mixture is put into the inner container 8 ″ from its mouth to be dehydrated, The dehydrated residual solids are taken out from the outer bag by opening the bottom of the outer container 8'while remaining inside the inner container 8 "and stored or transported. Fig. 7 shows the hanging of the mesh outer container 8 '. It is a figure in which ingredient 13 is provided in the trunk middle part of outside storage object 8 '. Drawing 8 and Drawing 10 are basket-like outside storage object 8', and these are the synthetic resin shown in Drawing 9 and Drawing 11 , respectively. A plurality of manufacturing units are assembled and assembled, whereby the water-containing mixture is dehydrated and stored or transported in the same manner as described above.Table 2 shows the results obtained by the treatment method of the present invention.

[0019]

[Table 1]

[0020]

[Table 2-1]

[0021]

[0022]

[Table 2-2]

[0023]

EFFECT OF THE INVENTION The sludge purification and separation treatment agent according to the present invention can be used to remove various types of wastewater pollutants such as dams, lakes, rivers, seabeds, industrial mud, agricultural, water and livestock products. The sludge can be dehydrated in an extremely short time, and the obtained solid matter such as separated soil is not re-slurried (liquefied), and for example, in the case of bottom sludge treatment, it can be regenerated into soil particles before the bottom sludge. Further, in the present invention, since a dehydration bag is used for dehydration, the dehydrated residual solid matter is dried quickly and does not form a mud stream even when it is exposed to rainwater. It has the advantages that the dehydration operation is simple, the dehydration and the storage or packing of the residual solids can be done in one step, and the transport for use is easy. Further, by forming the dehydration bag from the net-like outer bag and the inner bag made of non-woven cloth, the dehydration treatment, storage and transportation are further facilitated. Dehydration in a dehydration bag can be obtained only by using the specific purification / separation treatment agent of the present invention, and dehydration in a dehydration bag cannot be performed with a conventional hydrophobizing agent. It can be said to be an effect. Further, the purification / separation treatment agent of the present invention can deodorize or deodorize the bad odor peculiar to sludges, and also enables the sterilization of contained bacteria and the detoxification of heavy metals, and the obtained residual solid matter depends on its constituent components. It is possible to reuse as a soil improvement material for landfill soil, embankment soil, agricultural land, metal sludge,
Or, in the case of residual solids from the slurry, it can be used as an additive for the ceramic industry, and the separated water is returned to lakes, rivers, the sea, etc.
It has an extremely excellent effect that it can be used as a water resource.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for bag-type dehydration treatment of sludge according to the present invention.

FIG. 2 is a schematic view of the outer bag of the present invention in which the sludge dewatering bag is open.

FIG. 3 is a schematic view of the outer bag of the sludge dewatering bag of the present invention in a closed state.

FIG. 4 is a schematic view of an inner bag of the sludge dewatering bag of the present invention in an open state.

FIG. 5 is a schematic view of the inner bag of the sludge dewatering bag of the present invention in a closed state.

[Fig. 6 ] Fig. 6 is a schematic view of a dewatering container for the sludge dewatering of the present invention, in which an inner bag as an inner container is placed in a mesh outer container.

FIG. 7 is a schematic diagram of a dewatering container for sludges according to the present invention, in which an inner bag, which is an inner container, is placed in a net-shaped outer container.

[Fig. 8 ] Fig. 8 is a schematic view of a dewatering container for the sludge dewatering according to the present invention in which an inner bag as an inner container is placed in a basket-shaped outer container.

FIG. 9 is a development view of one unit for assembling the basket-shaped outer storage body in the storage body for dewatering sludges of the present invention.

FIG. 10 shows a sludge dewatering container according to the present invention,
It is a schematic diagram of a dewatering container in which an inner bag as an inner container is put in a basket-shaped outer container.

FIG. 11 shows a storage body for dehydrating sludge of the present invention,
It is a development view of one unit for assembling a basket-like outer side storage body.

[Explanation of symbols]

 1. Reaction tank 2. Stirrer 3. Input port 4. Valve 5. Mono pump 6. Bag fixing machine 7. Perforated plate 8. Dehydration bag 8 '. Outer bag of dehydration bag 8 ″. Inner bag of dehydration bag 9. Perforated plate 10. Mobile pulley 11. Stirrer motor 12. Motor for mono pump 13. Hanging tool 14. Drawstring 15. Basket hole 16. Unit connection part 17. Connecting rod 18. Rope fixing device 19. Drawstring string hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C02F 11/12 C 7446-4D D 7446-4D

Claims (3)

[Claims] 1. A purifying / separating agent for sludges, which comprises a divalent or trivalent iron salt, a trivalent metal salt and an alkaline earth metal salt as a main component and the inorganic salt dissolved in solvent water. In addition to sludges, the sludges are hydrophobized and separated, and then the outer container and the inner
It consists of the side storage body, the outer storage body is a hanging tool on the top,
It is a net-shaped storage body that has a fastener that can be opened and closed at the bottom.
A bottomed cloth storage for the side storage to dewater sludge.
A method for purifying and dehydrating sludges, which comprises performing dehydration treatment using a dehydration storage body comprising a body. 2. The method for purifying and dehydrating sludge according to claim 1, wherein the purifying and separating treating agent obtained by adding diphosphorus pentoxide to the purifying and separating treating agent according to claim 1 is used. 3. A purification separation treatment agent according to claim 1 or 2, wherein the addition process on sludge material such, then the sludge was such separated hydrophobic by adding a neutralizing agent further polymer flocculant, followed claim 1 notes
Purification dehydration method of the sludge product class, characterized in that the dehydration process by using a dehydrating container mounting. 4. The method for purifying and dehydrating sludges according to claim 1, wherein the outer container is a tubular mesh bag. 5. The method for purifying and dehydrating sludge according to claim 1, wherein the outer container is a cylindrical basket-shaped container. 6. The method for purifying and dehydrating sludges according to claim 1, wherein the inner container is a tubular bag made of a synthetic resin continuous long-fiber non-woven fabric. 7. A cleaning dehydration method of the sludge product such claim 1, wherein the inner container is made of a bag made from knitted fabric of synthetic resin reeling. 8. The method for purifying and dehydrating sludge according to claim 1, wherein the inner container is a bag made of a disintegrating or corrosive material.