JP4447148B2 - Cellulosic waste treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating cellulosic waste.
[0002]
[Prior art]
Cellulosic waste is plant-derived waste, such as agricultural waste such as rice straw and wheat straw, forestry waste such as waste wood, industrial waste such as pulp sludge, food and textile factory waste, waste paper, There are a wide variety of sources and sources, including household and commercial waste such as municipal waste including paper. In addition, there are many attempts to recycle resources by various methods.
For example, a method for producing a valuable product by hydrolyzing a cellulosic waste by causing an enzyme to obtain a sugar such as glucose and subjecting the sugar to a fermentation process such as alcohol fermentation or lactic acid fermentation has safety. It is considered to be an effective method because it is expensive and has a wide range of applications.
[0003]
[Problems to be solved by the invention]
However, in order to realize a method for saccharifying cellulosic waste and further fermenting and recycling it in this way, the cost required for the process is high, and it is not possible to make a profit as a waste treatment method. was there.
Specifically, for example, in order to carry out the above-described process involving saccharification and fermentation, in addition to facilities for saccharification and facilities for fermentation, facilities for receiving waste, facilities for separating and purifying sugar liquid, etc. Since it is necessary to construct various facilities, it is often impossible to make a profit if the amount of processing is not large.
In particular, since the fermentation process is a biological process that requires aseptic operation, the planning of the equipment requires consideration, and the operation know-how is more complicated than the normal chemical process.
In addition, to procure enzymes used for saccharification, it is expensive to purchase commercially available refined products. Even if you try to produce them in the facility, the enzyme production process is a biological process. Similarly, there is a problem that the equipment is not simple and the operation is complicated. In addition, when genetically modified microorganisms are used in fermentation processes and enzyme production processes, there are many problems to be solved, such as strict regulations and the need for containment operations.
In addition, cellulosic waste sources are often scattered, and the amount of emissions from individual sources is often small. Therefore, in order to increase profitability by increasing the amount of processing, it is necessary to collect cellulosic waste from a wide range of emission sources, but the transportation of bulky cellulosic waste is not economical. There was also a problem.
[0004]
The present invention has been made in view of the above circumstances, and can saccharify the cellulosic waste treatment, reduce the cost of the process of producing valuable materials from the sugar solution, and realize the recycling of the cellulosic waste. The purpose is to.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the method for treating cellulosic waste according to the present invention comprises a saccharification step for producing sugar by causing an enzyme to act on cellulosic waste at a primary treatment point, and a saccharide produced in the saccharification step. A sugar transport step for transporting the sugar-containing liquid to a secondary treatment point different from the primary treatment point, a fermentation step for performing fermentation using the sugar at the secondary treatment point, and an enzyme at the secondary treatment point. It has an enzyme production process which performs production, and an enzyme transportation process which conveys the enzyme produced in the enzyme production process to the primary processing point.
The sugar-containing liquid may be a reaction liquid after the saccharification reaction is started by causing an enzyme to act on the cellulosic waste, or may be a sugar liquid obtained by performing solid-liquid separation after the saccharification step. It may be a concentrated sugar solution obtained by concentrating the sugar solution obtained in the separation step.
[0006]
That is, the primary step includes a separation step of obtaining a sugar solution from which solid content has been removed by performing solid-liquid separation after the saccharification step, and a concentration step of concentrating the sugar solution obtained in the separation step to obtain a concentrated sugar solution. The sugar-containing liquid that is carried out at the processing point and transported in the sugar transporting process may be used as the concentrated sugar liquid.
In this case, it is preferable to perform a thermal energy recovery process in which the solid content removed in the separation process is burned to obtain thermal energy and supply the thermal energy to the concentration process at the primary processing point.
[0007]
Alternatively, after the saccharification step, solid-liquid separation is performed to obtain a saccharide solution from which solid content has been removed at the primary treatment point, and the saccharide solution obtained in the separation step is concentrated to obtain a concentrated saccharide solution. The concentration step to be obtained may be performed at the secondary treatment point, and the sugar-containing liquid transported in the sugar transport step may be the sugar solution obtained in the separation step.
In this case, there is provided a solid content transportation step for transporting the solid content removed in the separation step to the secondary treatment point, and the solid content is burned at the secondary treatment point to obtain thermal energy, and the thermal energy is obtained. It is preferable to perform a thermal energy recovery process to be supplied to the concentration process.
[0008]
Alternatively, the sugar-containing liquid transported in the sugar transporting process is used as a reaction liquid after the saccharification reaction is started by causing an enzyme to act on the cellulosic waste, and solid-liquid separation is performed after the saccharification process at the secondary treatment point. A separation step to obtain a sugar solution from which the solid content has been removed;
You may perform the concentration process of concentrating the sugar liquid obtained at the said isolation | separation process, and obtaining a concentrated sugar liquid.
In this case, it is preferable to perform a thermal energy recovery step in which the solid content removed in the separation step is burned to obtain thermal energy and supply the thermal energy to the concentration step at the secondary treatment point.
[0009]
Preferably, the enzyme transported in the enzyme transporting step is in a liquid state, and the enzyme transporting step and the sugar transporting step are performed using the same transporting means.
The cellulosic waste is preferably waste paper or waste containing waste paper. The enzyme is preferably a cellulase containing endoglucanase.
In the fermentation process, it is preferable to produce L-lactic acid and / or ethanol.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
1 to 3 show a first embodiment of the cellulosic waste processing method of the present invention, and FIG. 1 shows an example of a waste processing system suitable for carrying out the method of the present invention. FIG. 2 is a process diagram for mainly explaining the processing at the primary processing point, and FIG. 3 is a process diagram for explaining the processing at the secondary processing point.
In the figure, reference numeral 1 is a cellulosic waste, 100 is a primary treatment facility provided at a primary treatment point, and 200 is a central facility provided at a secondary treatment point.
Cellulosic waste to be treated is not particularly limited as long as it contains so-called plant-derived waste, but in particular waste paper or waste containing waste paper can be obtained by simple pretreatment (such as disaggregation). Since saccharification by is possible, it is preferable. Waste including waste paper is, for example, municipal waste discharged from households, business waste discharged from the food and beverage industry, offices, printing companies, and the like.
[0011]
In this embodiment, as shown in FIG. 1, the primary processing equipment 100 provided at a plurality of locations performs steps until the concentrated sugar solution 6 is obtained from the cellulosic waste 1, respectively. Transport to facility 200 (sugar transport step 150). In FIG. 1, solid arrows indicate movement of a sugar-containing liquid containing sugar. In this embodiment, the sugar-containing liquid is a concentrated sugar liquid 6.
On the other hand, the central facility 200 produces enzymes, and transports and supplies the enzyme solution 2 to the respective primary treatment facilities 100 (enzyme transport step 151). In FIG. 1, the dashed arrow indicates the movement of the enzyme solution 2.
The primary treatment facility 100 is preferably installed at a cellulosic waste discharge source or an accumulation site in the vicinity thereof. The central facility 200 may be installed at one location for several primary processing facilities.
[0012]
Hereinafter, the processing in the primary processing facility 100 will be described with reference to FIG.
First, the cellulosic waste 1 is pretreated as necessary (pretreatment step 101). For the pretreatment, an appropriate method is selected according to the type, use, facility conditions, and the like of the cellulosic waste 1. As specific examples, rice straw, wheat straw and the like are preferably subjected to steam explosion or dilute sulfuric acid treatment, and waste paper is subjected to disaggregation treatment. A disaggregation process is a process which loosens a fiber by adding water to waste paper and mixing it. If saccharification is possible without pretreatment, pretreatment may not be performed.
[0013]
Next, an enzyme is allowed to act on the cellulosic waste 1 to generate sugar (saccharification step 102). Specifically, cellulosic waste 1, pretreated as necessary, enzyme solution 2, and make-up water (clean water 3) are supplied into the saccharification tank, and the reaction conditions are set in advance. To do. The saccharification tank is preferably stirred. The enzyme is a cellulase. Among them, a cellulase having a high endoglucanase activity is preferable because it has a high crystallizing activity. The enzyme is produced in the central facility 200 and used in a liquid state (enzyme solution 2) supplied through the transport process 151. Specifically, it may be an unconcentrated solution obtained by separating the cells from the culture solution.
In the case of normal cellulase, the amount of enzyme used relative to the amount of substrate (cellulose waste 1) is preferably about 3 to 10% by weight in terms of protein. Reaction conditions may be normal saccharification conditions, for example, pH 4-7, temperature 30-60 ° C, more preferably 40-50 ° C. The amount of clean water 3 added as make-up water is adjusted so that the solids concentration is not more than a concentration (for example, 10 to 20% by weight) at which stirring can be sufficiently performed.
[0014]
In this saccharification step 102, the discharge amount of the cellulosic waste 1 serving as a substrate is not constant, and in the case of a small scale, it is preferable to carry out the batch method in terms of cost, but the discharge amount is constant or large scale. In some cases, it may be performed continuously.
The degree of saccharification in this saccharification step 102 is not limited as long as the cellulosic waste 1 can be liquefied. desirable. Depending on the application, a large amount of polysaccharide may remain. The sugar concentration in the saccharified solution obtained by saccharification is preferably about 5 to 10% by weight. If the sugar concentration of this saccharified solution is too high, the enzyme reaction in the saccharification step 102 will not proceed efficiently.
[0015]
Subsequently, the saccharified solution obtained in the saccharification step 102 is subjected to solid-liquid separation, and the solid content is removed as a residue 5 to obtain a saccharide solution 4 (separation step 103). As the solid-liquid separation means, a filtration means or a centrifugal separation means is preferably used.
Then, the obtained sugar solution 4 is concentrated by evaporation or a reverse osmosis membrane to obtain a concentrated sugar solution 6 (concentration step 104). The obtained concentrated sugar solution 6 is transported to the central facility 200 (sugar transporting step 150). The transport means is not particularly limited as long as it can transport a liquid, and examples thereof include a tank car, a container, a tanker, a railway, and a pipeline.
The sugar concentration of the concentrated sugar solution 6 is preferably 20 to 70% by weight, and more preferably a preferable sugar concentration according to the form to be transported. For example, when the concentrated sugar solution 6 is transported by a tank truck or the like, the sugar concentration is more preferably 50 to 60% by weight. The higher the sugar concentration, the better the storage stability, and the lower the transport amount, the better the transport efficiency.
Moreover, when transporting using a pipeline, it is preferable that the sugar concentration is lower because fluidity is better.
[0016]
On the other hand, the residue 5 separated and removed in the separation step 103 is supplied to combustion means such as a boiler 105, where it is burned to obtain thermal energy, and the obtained thermal energy can be used as a heat source in the concentration step 104. Preferred (thermal energy recovery step). For example, the residue 5 is combusted in the boiler 105, the generated heat is used for waste heat power generation, and the low pressure steam 9 discharged from the steam turbine of the waste heat power generation is supplied to the concentration step 104 as a heat source. Moreover, the electric power obtained by this waste heat power generation can be used as a power source in the saccharification process 102. For example, auxiliary fuel 8 such as heavy oil is supplied to the boiler 105 as necessary.
Further, the evaporated vapor generated in the concentration step 104 can be directly or indirectly cooled and recovered as a condensate (condensate) 7. The recovered condensate 7 can be reused as makeup water in the saccharification step 102.
[0017]
A sugar transporting process 150 for transporting the concentrated sugar liquid 6 produced in the primary processing equipment 100 to the central equipment 200 and an enzyme transporting process 151 for supplying the enzyme liquid 2 produced in the central equipment 200 to the saccharification process 102 are performed, for example, in a tank. When carrying out by discontinuous transportation means such as cars, containers, tankers, railways, etc., the transportation efficiency can be improved by using the same transportation means for the sugar transportation step 150 and the enzyme transportation step 151, respectively. it can.
As a means for transporting the concentrated sugar solution 6 and the enzyme solution 2, one having a cooling mechanism for keeping the transported liquid at a low temperature is preferable. The transport temperature of the concentrated sugar solution 6 is preferably within a range of about 5 to 20 ° C. because it is likely to rot if it is too high. The transport temperature of the enzyme solution 2 is preferably in the range of about 5 to 10 [deg.] C. if the temperature is too high, the activity is likely to decrease and the propagation of various bacteria tends to occur, and if it is too low, the protein structure may be affected.
Since both the concentrated sugar solution 6 and the enzyme solution 2 are liquids that are not corrosive or dangerous, there are no special restrictions on the material of the transportation means, and both transportations can be performed by the same transportation means.
In addition, information on the amount of waste 1 carried into the primary treatment facility 100 and the amount of concentrated sugar liquid 6 produced at the primary treatment facility 100 is managed by, for example, the central facility 200, and the operation schedule of the transportation means, By determining the amounts of the concentrated sugar solution 6 and the enzyme solution 2 carried at one time, the temporary storage amounts of the concentrated sugar solution 6 and the enzyme solution 2 in the primary treatment facility 100 can be minimized.
[0018]
Next, processing in the central facility 200 will be described with reference to FIG.
The central facility 200 includes a concentrated sugar solution storage tank 201 for temporarily storing the concentrated sugar solution 6 that has been transported from the primary processing facility 100. The concentrated sugar solution 6 collected in the concentrated sugar solution storage tank 201 is purified by the sugar refining plant 202, supplied to the enzyme plant 203, and used as a constituent of the culture solution for enzyme production.
In the enzyme plant 203, cell bodies of cellulase-producing microorganisms such as Trichoderma genus and Aspergillus genus are cultivated and produced in a liquid medium. The concentrated liquid is temporarily stored in the enzyme liquid storage tank 204 as the enzyme liquid 2 (enzyme production process). Then, the enzyme solution 2 is taken out from the enzyme solution storage tank 204 as necessary, and supplied to the primary treatment facility 100. In the enzyme liquid storage tank 204, a stabilization process such as addition of a preservative may be appropriately performed.
[0019]
Further, the concentrated sugar solution 6 collected in the concentrated sugar solution storage tank 201 can be purified as necessary, and then used as a fermentation substrate for producing valuable materials by fermentation (fermentation process). For example, an ethanol plant 205 is provided to produce ethanol from sugar by ethanol fermentation. The resulting ethanol is As fuel Can be used. As a specific example, if a vehicle using ethanol as a power source is used as a transportation means in the sugar transportation step 150 and the enzyme transportation step 151, there is an advantage that it is not necessary to consume fossil fuel such as gasoline. Or the lactic acid plant 206 is provided, and L-lactic acid is produced from sugar by lactic acid fermentation. L-lactic acid is highly useful as a raw material for the lactic acid polymer that is the biodegradable polymer 211. Reference numeral 207 in FIG. 2 indicates a plant for producing a lactic acid polymer. Here, when a large amount of polysaccharide remains in the concentrated sugar solution 6 collected in the concentrated sugar solution storage tank 201, it is further hydrolyzed to a monosaccharide by acting an enzyme or an acid, It is preferably used as a fermentation substrate. Moreover, you may perform saccharification and fermentation simultaneously by adding an enzyme to a fermenter. Alternatively, if a microorganism that assimilate the polysaccharide is used, it can be effectively used even in a state where a large amount of polysaccharide remains.
[0020]
Residues 212 generated in the sugar refining plant 202, the enzyme plant 203, the ethanol plant 205, the lactic acid plant 206, etc. are collectively supplied to the power plant 208 in the central facility 200, where energy for obtaining steam 213 and electric power 214 is obtained. It is preferably used as a source. In the power plant 208, for example, the electric power 214 can be obtained by burning the residue 212 and using the generated heat for waste heat power generation. The low-pressure steam 213 discharged from the steam turbine for waste heat power generation can be used as a heat source. If necessary, an appropriate auxiliary fuel (not shown) is supplied to the power plant 208. As such a power plant 208, an existing incineration facility can be used.
Note that the condensate storage tank 209 in FIG. 3 is provided as necessary when the concentration facility 210 is provided close to the central facility 200 as in the embodiment described later. It is not necessary to provide it.
[0021]
In the present embodiment, the primary treatment facility 100 performs the step of liquefying the cellulose waste 1 with an enzyme, and the central facility 200 performs the step of producing the enzyme and the step of producing valuable materials using sugar. The cellulosic waste is treated by transporting liquid between both facilities, so that even if the sources of cellulosic waste 1 are scattered or the amount of discharge is small, the process By centrally performing the department in the central facility 200, it can be rationalized so as to be profitable.
Even when the number of emission sources of the cellulose waste 1 increases, only the primary treatment facility 100 needs to be added or relocated in response to a new emission source, so that a prompt response can be made at low cost.
If the primary treatment facility 100 is provided close to the factory or the like of the discharge source, utilities such as electric power and clean water can be supplied from the factory at low cost, thereby reducing costs.
Since the transportation form between both facilities is liquid, transportation efficiency is good, loading and unloading work is easy, and transportation by pipeline is also possible depending on conditions.
[0022]
By concentrating processes using biological processes on central facilities, capital investment and operating costs can be reduced.
What is carried into the central facility 200 is in a form that is not included in the category of waste, so it is clean and requires less restrictions on the location conditions of the central facility 200.
Moreover, since the enzyme which acts on the cellulosic waste 1 is produced and used in the central facility 200, it is not necessary to purchase a purified product from the outside. Enzymes for use in the primary treatment facility 100 are not so demanding for purity and concentration, so that the enzymes produced in the central facility 200 can be supplied without purification, greatly increasing the cost for procuring enzymes. Can be reduced. In addition, the transportation cost can be suppressed by transporting the sugar solution and the enzyme solution using the same transportation means.
In particular, in the present embodiment, the residue 5 generated in the primary processing facility 100 can be processed and reused in the primary processing facility 100, so that energy efficiency is good and transportation of the residue 5 is unnecessary.
In addition, since the sugar-containing liquid is transported from the primary processing facility 100 to the central facility 200 in the form of the concentrated concentrated sugar solution 6, the transport amount is small and the transport efficiency is high.
[0023]
Next, a second embodiment of the cellulosic waste processing method of the present invention will be described. FIG. 4 is a process diagram for mainly explaining the processing at the primary processing point. 4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.
The waste treatment system of the present embodiment is greatly different from the first embodiment in that a concentration facility 210 for performing the concentration step 104 is provided in the vicinity of the central facility 200. Here, being close to the central facility 200 means being installed so that the concentrated sugar solution 6 and the condensate 7 can be supplied to the central facility 200 without using a transportation means, and the concentration facility 210 is also secondary. It is provided at the processing point. A concentration facility 210 may be provided in the central facility 200. The concentrating facility 210 is also provided with a boiler 105 and the like for burning the residue 5 to recover thermal energy and reusing it for the concentrating step 104.
[0024]
In this embodiment, the separation process 103 is performed after the saccharification process 102 until the sugar solution 4 is obtained by the primary processing equipment 110 and transported to the concentration equipment 210 in the form of the sugar liquid 4 before concentration (sugar transport process). 152). The residue 5 produced in the separation step 103 is preferably transported to the concentration facility 210 after being subjected to a treatment such as drying or solidification as required (solid content transporting step 153). In the concentration facility 210, the sugar liquid 4 is concentrated to obtain a concentrated sugar liquid 6, which is supplied to the concentrated sugar liquid storage tank 201 (concentration step 104). In the boiler 105, the residue 5 transported from the primary processing facility 110 is burned, the generated heat is used for waste heat power generation, and the low pressure steam 9 discharged from the steam turbine of the waste heat power generation is used as a heat source for the concentration step 104. Supply (thermal energy recovery process). In addition, the evaporation vapor generated in the concentration step 104 is directly Or indirectly After cooling and recovering as condensate (condensate) 7, the condensate storage tank 209 is primarily stored, 203 It is preferable that the water is reused in the central facility 200 as makeup water. The processing steps in the central facility 200 can be the same as those in the first embodiment.
[0025]
In this way, the primary processing facility 110 is configured to perform the separation step 103, and the concentration step 104 and the facility for heat energy recovery are provided at the secondary processing point, so that the primary processing is performed as compared with the first embodiment. The facility 110 is simplified and space-saving, and the installation of the primary processing facility 110 is easy and low cost.
Moreover, in this embodiment, since it has the solid content transport process 153 in addition to the sugar transport process 152 and the enzyme transport process 151, the distance between the primary processing equipment 110 and the central equipment 200 is relatively short, and it is carried into the primary processing equipment 110. It is particularly suitable when the amount of cellulosic waste 1 to be produced is small.
[0026]
Next, a third embodiment of the cellulosic waste processing method of the present invention will be described. FIG. 5 is a process diagram for mainly explaining processing at the primary processing point. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and the description thereof is omitted.
The waste treatment system of the present embodiment is greatly different from the first embodiment in that a separation facility 220 for performing the separation step 103 in the vicinity of the central facility 200 and a concentration facility for performing the concentration step 104. 210 is provided. Here, being close to the central facility 200 is installed so that the sugar solution 4 can be supplied to the concentration facility 210 and the concentrated sugar solution 6 and the condensate 7 can be supplied to the central facility 200 without using a transportation means. That is, the separation facility 220 and the concentration facility 210 are also provided at the secondary processing point. A separation facility 220 and a concentration facility 210 may be provided in the central facility 200. The concentrating facility 210 is also provided with a boiler 105 and the like for burning the residue 5 to recover thermal energy and reusing it for the concentrating step 104.
[0027]
In the present embodiment, in the primary treatment facility 120, after pretreatment 101 is performed on the cellulosic waste 1 as necessary, the enzyme is allowed to act to start the saccharification reaction, and the reaction solution 10 in the saccharification reaction process is added. Transport to separation facility 220 (sugar transport step 154). For example, the cellulose waste 1, the enzyme solution 2, and makeup water (clean water 3) are supplied into the saccharification tank, and the reaction is performed by maintaining the reaction conditions set in advance while stirring the saccharification tank. Liquid 10 is obtained. The reaction liquid 10 to be transported may be a reaction liquid immediately after the hydrolysis of the cellulosic waste 1 by the enzyme starts, or may be a reaction liquid immediately before being supplied to the separation step 103 with a predetermined sugar concentration, An intermediate reaction solution may be used. Moreover, the primary treatment equipment 120 may be configured only by a saccharification tank, and the entire saccharification tank may be transported.
In the sugar transport step 154, the reaction can proceed during transport by maintaining the reaction solution being transported under preset reaction conditions.
wear. The reaction solution being transported is stirred to some extent by vibration during transport, but since the reaction is promoted by positive stirring, it is more preferable to use transport means equipped with stirring means.
When the reaction solution 10 is supplied to the separation facility 220 after the sugar transporting step 154, the sugar concentration of the reaction solution 10 has reached a preset preferred sugar concentration (5 to 10% by weight) of the saccharified solution. Is preferred.
[0028]
In the separation facility 220, the transported reaction liquid 10 is subjected to solid-liquid separation, and the solid content is removed as a residue 5 to obtain a sugar liquid 4 (separation step 103). The sugar solution 4 is supplied to the concentration facility 210 and concentrated here to obtain the concentrated sugar solution 6 (concentration step 104), which is supplied to the concentrated sugar solution storage tank 201. On the other hand, the residue 5 generated in the separation step 103 is supplied to the boiler 105 of the concentrating facility 210, and the heat generated by combustion is used for waste heat power generation, and the low pressure steam discharged from the steam turbine of the waste heat power generation. 9 is supplied to the concentration step 104 as a heat source (thermal energy recovery step). In addition, the evaporation vapor generated in the concentration step 104 is directly Or indirectly After cooling and recovering as condensate (condensate) 7, the condensate storage tank 209 is primarily stored, 203 It is preferable that the water is reused in the central facility 200 as makeup water.
[0029]
In this way, at least the enzyme saccharification reaction is started in the primary treatment equipment 120, and the equipment for the separation process 103, the equipment for the concentration process 104 and the heat energy recovery are used as the secondary treatment points. By providing, the primary processing equipment 120 is further simplified and space-saving compared to the first and second embodiments, and the installation of the primary processing equipment 120 is easier and less expensive.
Moreover, in this embodiment, since it is transported from the primary processing point to the secondary processing point in the state of the reaction solution 10, the distance between the primary processing point and the secondary processing point is relatively long and is carried into the primary processing facility 110. This is particularly suitable when the amount of the cellulosic waste 1 is small.
In the present embodiment, since the separation process 103, the concentration process 104, and the thermal energy recovery process are all performed at the secondary processing point, the transport process of the residue 5 is not necessary.
[0030]
Further, as shown in FIG. 5, if the central facility 200, the separation facility 220, and the concentration facility 210 are provided at the secondary treatment point, the place where the cellulosic waste 1 is discharged, the secondary treatment point, It is also possible to construct one system by combining the first to third embodiments according to the distance and the amount of discharge. For example, a primary processing facility 100 that performs up to the concentration step 104 as in the first embodiment is provided for a relatively large discharge source such as a factory, and the second embodiment is used for a relatively small discharge source. The primary processing equipment 110 that performs the separation process 103 as described above is provided, and the primary processing equipment 120 that performs only the saccharification process 102 as in the third embodiment is provided in a relatively small and remote discharge source, and these It is also possible to transport the sugar-containing liquid in a form corresponding to the treatment process in each facility from the primary treatment facility 100, 110, 120 to one secondary treatment point.
[0031]
【The invention's effect】
As described above, according to the present invention, instead of performing the entire process of saccharifying cellulosic waste processing and producing valuable resources from a sugar solution at one place, an enzyme is allowed to act on cellulosic waste to produce sugar. The saccharification process for producing sucrose is carried out at the first treatment point, the fermentation process and the enzyme production process using the obtained sugar are carried out at the second treatment point, and sugar is applied from the first treatment point to the second treatment point. A series of treatments for saccharifying cellulosic waste and producing valuables from the obtained sugars by transporting the contained liquid and conversely transporting enzymes from the second processing point to the first processing point Efficiency and cost reduction can be achieved. As a result, the feasibility of recycling cellulose waste with this treatment method is greatly enhanced.
Further, by using the thermal energy obtained by burning the solid content (residue) generated in the saccharification step in the system, waste of thermal energy can be reduced and further cost reduction can be achieved.
Furthermore, by transporting the enzyme transported in the enzyme transporting process in a liquid state and performing the enzyme transporting process and the sugar transporting process using the same transporting means, the transport efficiency can be improved and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of a waste treatment system according to a first embodiment of the present invention.
FIG. 2 is a process diagram for explaining processing at a primary processing point according to the first embodiment of the present invention.
FIG. 3 is a process diagram for explaining processing at a secondary processing point according to the first embodiment of the present invention.
FIG. 4 is a process diagram for explaining processing at a primary processing point according to a second embodiment of the present invention.
FIG. 5 is a process diagram for explaining processing at a primary processing point according to a third embodiment of the present invention.
[Explanation of symbols]
1 ... Cellulosic waste, 2 ... Enzyme solution, 4 ... Sugar solution, 5 ... Residue (solid content),
6 ... concentrated sugar solution, 10 ... reaction solution,
100, 110, 120 ... primary treatment equipment, 102 ... saccharification process,
103 ... Separation step, 104 ... Concentration step, 105 ... Boiler (combustion means),
150, 152, 154 ... sugar transport step, 151 ... enzyme transport step,
153 ... Solid content transporting process, 200 ... Central equipment, 210 ... Concentration equipment,
220: Separation equipment.

Claims (12)

A saccharification step in which sugar is produced by causing an enzyme to act on cellulosic waste at a primary treatment point;
A sugar transporting step for transporting a sugar-containing liquid containing the sugar produced in the saccharification step to a secondary treatment point different from the primary treatment point;
A fermentation step of performing fermentation using the sugar at the secondary treatment point;
An enzyme production process for producing an enzyme at the secondary treatment point;
A method for treating cellulosic waste, comprising: an enzyme transporting step for transporting the enzyme produced in the enzyme producing step to the primary treatment point. A separation step of performing solid-liquid separation after the saccharification step at the primary treatment point to obtain a sugar solution from which solids have been removed;
A concentration step of concentrating the sugar solution obtained in the separation step at the primary treatment point to obtain a concentrated sugar solution,
The method for treating cellulosic waste according to claim 1, wherein the sugar-containing liquid transported in the sugar transporting step is the concentrated sugar liquid. 3. The heat energy recovery step according to claim 2, further comprising: a thermal energy recovery step of burning the solid content removed in the separation step to obtain thermal energy and supplying the thermal energy to the concentration step at the primary treatment point. Cellulosic waste treatment method. A separation step of performing solid-liquid separation after the saccharification step at the primary treatment point to obtain a sugar solution from which solids have been removed;
A concentration step of concentrating the sugar solution obtained in the separation step at the secondary treatment point to obtain a concentrated sugar solution,
The method for treating cellulosic waste according to claim 1, wherein the sugar-containing liquid transported in the sugar transporting step is a sugar solution obtained in the separation step. A solid content transporting step for transporting the solid content removed in the separation step to the secondary treatment point;
The cellulosic waste treatment according to claim 4, further comprising a thermal energy recovery step of burning the solid content at the secondary treatment point to obtain thermal energy and supplying the thermal energy to the concentration step. Method. The sugar-containing liquid transported in the sugar transporting step is a reaction liquid after the saccharification reaction is started by causing an enzyme to act on the cellulosic waste,
A separation step of performing solid-liquid separation after the saccharification step at the secondary treatment point to obtain a sugar solution from which solids have been removed;
The cellulosic waste treatment method according to claim 1, further comprising a concentration step of concentrating the sugar solution obtained in the separation step to obtain a concentrated sugar solution at the secondary treatment point. 7. The method according to claim 6, further comprising a thermal energy recovery step of obtaining thermal energy by burning the solid content removed in the separation step and supplying the thermal energy to the concentration step at the secondary treatment point. Of cellulosic waste. The cellulose according to any one of claims 1 to 7, wherein the enzyme transported in the enzyme transporting step is liquid, and the enzyme transporting step and the sugar transporting step are performed using the same transporting means. Of waste treatment. The method for treating cellulosic waste according to any one of claims 1 to 8, wherein the cellulosic waste is waste paper or waste containing waste paper. The method for treating cellulosic waste according to any one of claims 1 to 9, wherein the enzyme is a cellulase containing endoglucanase. The method for treating cellulosic waste according to any one of claims 1 to 10, wherein L-lactic acid is produced in the fermentation step. The method for treating cellulosic waste according to any one of claims 1 to 10, wherein ethanol is produced in the fermentation step.

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