JP2002159954A - Method for treating cellulose-based waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reuse cellulose-based waste as resources by lowering the cost necessary to a process to convert the cellulose-based waste into sugar and manufacture valuable substances from the obtained liquid sugar. SOLUTION: A saccharizng step to produce sugar by reacting the cellulose- based waste 1 with an enzyme liquid 2 is carried out in a primary treatment equipment 100 installed at a primary treatment spot. A sugar-containing liquid 6 produced at the saccharizing step is transported to a central equipment 200 installed at a secondary treatment spot. A fermentation step to ferment the liquid 6 and an enzyme manufacturing step to manufacture an enzyme are carried out in the equipment 200. The liquid 2 manufactured at the enzyme manufacturing step is transported to the equipment 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for treating cellulosic waste.

[0002]

2. Description of the Related Art Cellulosic wastes are plant-derived wastes, such as agricultural wastes such as rice straw and straw, forestry wastes such as waste materials, pulp sludge, foodstuffs, and textile factory wastes. Households such as municipal waste including waste, waste paper, and paper
There are a wide variety of sources and sources, including commercial waste. Attempts are also being made to recycle resources in a variety of ways. For example, a method of producing sugars such as glucose by hydrolysis by reacting an enzyme with cellulosic waste to obtain sugars such as glucose, and subjecting the sugars to a fermentation process such as alcohol fermentation or lactic acid fermentation is not safe. It is considered to be an effective method because it is expensive and has a wide range of applications.

[0003]

However, in order to realize such a method of saccharifying the cellulosic waste and further fermenting it to recycle it, the cost required for the process is high and the waste treatment method is difficult. As a result, there were problems such as unprofitability. Specifically, for example, in order to carry out the process involving saccharification and fermentation described above, in addition to saccharification equipment and fermentation equipment, equipment for receiving waste, equipment for separating and purifying sugar liquid, etc. Since it is necessary to construct various types of equipment, it is often impossible to make profits unless the processing amount is large. In particular, since the fermentation process is a biological process that requires aseptic operations, consideration must be given to equipment planning, and the operational know-how is more complicated than ordinary chemical processes. In addition, it is expensive to purchase commercially available purified products to procure enzymes used for saccharification, but even if you try to produce them in facilities, the enzyme production process is a biological process, so the fermentation process and Similarly, there is a problem that the equipment is not simple and the operation is complicated. In addition, when a genetically modified microorganism is used in a fermentation step or an enzyme production step, there are many problems to be solved, such as strict regulations and an operation for containment. Also, the sources of cellulosic waste are often scattered, and the amount of discharge at each source is often small. Therefore, in order to increase the throughput and make it profitable, it is necessary to collect cellulosic waste from a wide range of sources, but transporting bulky cellulosic waste is not economical. There were also problems.

The present invention has been made in view of the above circumstances, and saccharifies cellulose waste treatment, reduces the cost of a process for producing valuable materials from sugar solution, and recycles cellulose waste. It is intended to be able to be realized.

[0005]

Means for Solving the Problems To solve the above problems, a method for treating cellulosic waste according to the present invention comprises a saccharification step of producing a saccharide by causing an enzyme to act on a cellulosic waste at a primary treatment point. A sugar transporting step of transporting a sugar-containing liquid containing the sugar generated in the saccharification step to a secondary processing point different from the primary processing point, and a fermentation step of performing fermentation using the sugar at the secondary processing point. And an enzyme production step of producing an enzyme at the secondary processing point; and an enzyme transporting step of transporting the enzyme produced in the enzyme production step to the primary processing point. The sugar-containing liquid,
The reaction solution may be a reaction solution after a saccharification reaction is started by allowing an enzyme to act on the cellulosic waste, or a sugar solution obtained by performing solid-liquid separation after the saccharification step. It may be a concentrated sugar solution obtained by concentrating the obtained sugar solution.

That is, a separation step of performing solid-liquid separation after the saccharification step to obtain a sugar liquid from which solids have been removed, and a concentration step of concentrating the sugar liquid obtained in the separation step to obtain a concentrated sugar liquid. At the primary treatment point, and the sugar-containing liquid transported in the sugar transporting step may be used as the concentrated sugar liquid. In this case, it is preferable to perform a thermal energy recovery step of burning the solid content removed in the separation step at the primary treatment point to obtain thermal energy and supplying the thermal energy to the concentration step.

[0007] Alternatively, after the saccharification step, a solid-liquid separation is performed to obtain a sugar liquid from which solids have been removed at the primary treatment point, and the sugar liquid obtained in the separation step is concentrated and concentrated. A concentration step of obtaining a sugar liquid may be performed at the secondary treatment point, and the sugar-containing liquid transported in the sugar transport step may be used as the sugar liquid obtained in the separation step. In this case, a solid content transporting step of transporting the solid content removed in the separation step to the secondary processing point is provided, and the solid content is burned at the secondary processing point to obtain thermal energy, and the thermal energy is It is preferable to perform a thermal energy recovery step to be supplied to the concentration step.

Alternatively, the sugar-containing liquid transported in the sugar transporting step is used as a reaction liquid after the saccharification reaction is started by reacting the cellulosic waste with an enzyme, and solidified after the saccharification step at the secondary treatment point. A separation step of performing liquid separation to obtain a sugar liquid from which solids have been removed, and a concentration step of concentrating the sugar liquid obtained in the separation step to obtain a concentrated sugar liquid may be performed. In this case, it is preferable to perform a thermal energy recovery step of burning the solid content removed in the separation step at the secondary processing point to obtain thermal energy and supplying the thermal energy to the concentration step.

It is preferable that 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. As the cellulosic waste, waste paper or waste containing waste paper is preferable. As the enzyme, cellulase containing endoglucanase is preferable. In the fermentation step, L
-It is preferred to produce lactic acid and / or ethanol.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
1 to 3 show a first embodiment of a method for treating cellulosic waste according to the present invention. FIG. 1 shows an example of a waste treatment system suitable for carrying out the method according to the present invention. FIG. 2 is a process diagram for mainly explaining processing at a primary processing point, and FIG. 3 is a process diagram for explaining processing at a secondary processing point. Symbol 1 in the figure
Denotes a cellulosic waste, 100 denotes a primary treatment facility provided at a primary treatment point, and 200 denotes a central facility provided at a secondary treatment point. The cellulosic waste to be treated is not particularly limited as long as it contains so-called plant-derived waste. In particular, waste paper or waste containing waste paper is subjected to the enzyme by simple pretreatment (eg, disaggregation). Saccharification is possible. The waste including waste paper is, for example, municipal waste discharged from homes, business waste discharged from the food and beverage industry, offices, printers, and the like.

In the present embodiment, as shown in FIG. 1, the processes until the concentrated sugar solution 6 is obtained from the cellulosic waste 1 are performed in the primary treatment facilities 100 provided at a plurality of locations. 6 is transported to the central facility 200 (sugar transport step 150). In FIG. 1, the solid arrows indicate the movement of the sugar-containing solution containing sugar, and in this embodiment, the sugar-containing solution is the concentrated sugar solution 6. On the other hand, in the central facility 200, the enzyme is produced, and the enzyme solution 2 is transported and supplied to each primary treatment facility 100 (enzyme transport step 151).
In FIG. 1, broken arrows indicate the movement of the enzyme solution 2. The primary treatment facility 100 is preferably installed at a source of cellulosic waste or at a nearby accumulation site.
The central facility 200 may be installed at one location for several primary processing facilities.

Hereinafter, the primary processing equipment 1 will be described with reference to FIG.
The process at 00 will be described. First, the cellulosic waste 1 is subjected to pretreatment as necessary (pretreatment step 10).
1). For the pretreatment, an appropriate method is selected according to the type of the cellulosic waste 1, the use, the equipment conditions, and the like. As a specific example, rice straw, wheat straw, and the like are preferably subjected to steam explosion or dilute sulfuric acid treatment, and waste paper is subjected to defibration treatment.
The defibration treatment is a treatment for loosening the fibers by adding water to the waste paper and mixing. In addition, if the saccharification treatment can be performed without performing the pretreatment, the pretreatment may not be performed.

Next, an enzyme is acted on the cellulosic waste 1 to produce sugar (saccharification step 102). Specifically, the cellulose-based waste 1, pretreated as necessary, the enzyme solution 2, and makeup water (tap water 3) are supplied into the saccharification tank, and maintained at a preset reaction condition. I do. It is preferable to stir the inside of the saccharification tank. The enzyme is a cellulase. Among them, a cellulase having a high endoglucanase activity is preferable because of its high crystal decomposition activity. The enzyme used is a liquid (enzyme solution 2) produced in the central facility 200 and supplied through the transportation step 151. Specifically, it may be an unconcentrated liquid obtained by separating the cells from the culture solution. The amount of the enzyme to be used relative to the amount of the substrate (cellulosic waste 1) is preferably about 3 to 10% by weight in terms of protein in the case of ordinary cellulase. The reaction conditions may be ordinary saccharification conditions, such as pH
4-7, temperature 30-60 ° C, more preferably 40-50
° C. The amount of clean water 3 to be added as makeup water depends on the concentration of the solid matter (for example, 10 to 2) at which sufficient stirring can be performed.
0% by weight) or less.

In the saccharification step 102, the discharge amount of the cellulosic waste 1 serving as a substrate is not constant, and when the scale is small, it is preferable to perform batchwise in terms of cost, but the discharge amount is constant. In the case of a large scale, it may be performed continuously. The degree of saccharification in the saccharification step 102 may be such that the cellulosic waste 1 can be liquefied. However, when the obtained saccharide is used as a fermentation substrate, saccharification may be performed until it is decomposed into monosaccharides. 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 the saccharified solution is too high, the saccharification step 102
The enzyme reaction in does not proceed efficiently.

Subsequently, the saccharified solution obtained in the saccharification step 102 is subjected to solid-liquid separation to remove solids as a residue 5 and to remove the saccharified 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 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 transportation means is not particularly limited as long as it can transport liquid, and examples thereof include a tanker, a container, a tanker, a railway, and a pipeline. The sugar concentration of the concentrated sugar solution 6 is preferably from 20 to 70% by weight, and more preferably a preferred sugar concentration depending on the transport mode. 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 preservability, and the smaller the transport volume, the better the transport efficiency. In the case of transportation using a pipeline, it is preferable that the sugar concentration is low because the flowability is good.

On the other hand, the residue 5 separated and removed in the separation step 103 is supplied to a combustion means such as a boiler 105, where it is burned to obtain heat energy, and the obtained heat energy is used as a heat source in the concentration step 104. (Thermal energy recovery step). For example, the residue 5 is burned in the boiler 105, and 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. The electric power obtained by this waste heat power generation can be used as a power source in the saccharification process 102. An auxiliary fuel 8 such as heavy oil is supplied to the boiler 105 as needed. Further, the evaporated vapor generated in the concentration step 104 can be cooled directly or indirectly and recovered as a condensate (condensate) 7. The collected condensate 7 is used in the saccharification step 1
02 can be reused as makeup water.

A sugar transporting step 150 for transporting the concentrated sugar solution 6 produced in the primary treatment facility 100 to the central facility 200 and an enzyme transporting step 151 for supplying the enzyme solution 2 produced in the central facility 200 to the saccharification step 102. For example, when using a non-continuous transportation means such as a tanker, a container, a tanker, and a railroad, the outward transportation and the return transportation of the same transportation means are performed in the sugar transportation step 150.
And the enzyme transport step 151 can be used to improve transport efficiency. The means for transporting the concentrated sugar solution 6 and the enzyme solution 2 preferably has a cooling mechanism for keeping the transported liquid at a low temperature. The transport temperature of the concentrated sugar solution 6 is preferably in the range of about 5 to 20 ° C., since if it is too high, it tends to rot. In addition, if the transport temperature of the enzyme solution 2 is too high, the activity is reduced and germs are easily propagated. If the transport temperature is too low, the protein structure may be affected.
The temperature is preferably in the range of about 5 to 10 ° C. Since both the concentrated sugar solution 6 and the enzyme solution 2 are liquids having no corrosiveness or danger, there is no particular limitation on the material of the transportation means and the like, and both transportations can be performed by the same transportation means. In addition, information on the amount of the waste 1 carried into the primary treatment facility 100 and the amount of the concentrated sugar solution 6 produced by the primary treatment facility 100 is managed by, for example, the central facility 200, and the operation schedule of the transportation means, Concentrated sugar solution 6 and enzyme solution 2 to be carried at one time
By determining the amount, the temporary storage amounts of the concentrated sugar solution 6 and the enzyme solution 2 in the primary treatment facility 100 can be minimized.

Next, referring to FIG.
Will be described. The central equipment 200 includes a concentrated sugar liquid storage tank 201 for temporarily storing the concentrated sugar liquid 6 transported from the primary processing equipment 100. The concentrated sugar solution 6 collected in the concentrated sugar solution storage tank 201 is purified in the sugar purification plant 202, supplied to the enzyme plant 203, and used as a component of a culture solution for enzyme production. In the enzyme plant 203, for example, Trichoderma (Tr
After culturing and producing in a liquid medium using cells of a cellulase-producing microorganism such as the genus Aspergillus or Aspergillus, an unconcentrated liquid obtained by separating and removing the cells from the culture solution is used as the enzyme solution 2 as an enzyme solution. The liquid is temporarily stored in the liquid storage tank 204 (enzyme production step). Then, the enzyme solution 2 is taken out from the enzyme solution storage tank 204 as needed, and
Supply to 00. In the enzyme solution storage tank 204, a stabilizing treatment such as adding a preservative may be appropriately performed.

The concentrated sugar solution 6 collected in the concentrated sugar solution storage tank 201 can be used as a fermentation substrate for producing valuable materials by fermentation after purification treatment as needed (fermentation step). For example, an ethanol plant 205 is provided, and ethanol is produced from sugar by ethanol fermentation. The obtained ethanol can be used as fuel 210. 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 a fossil fuel such as gasoline is not consumed. Alternatively, a lactic acid plant 206 is provided, and L-
Produces lactic acid. L-lactic acid is a biodegradable polymer 211
It is highly useful as a raw material for lactic acid polymer. FIG.
Reference numeral 207 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,
Furthermore, it is preferable to hydrolyze to a monosaccharide by the action of an enzyme or an acid, and then use it as a fermentation substrate. Further, saccharification and fermentation may be performed simultaneously by adding an enzyme to the fermenter. Alternatively, if a microorganism that assimilates the polysaccharide is used, it can be effectively used even when a large amount of the polysaccharide remains.

Sugar refining plant 202, enzyme plant 20
3. Residues 212 generated in the ethanol plant 205, the lactic acid plant 206, and the like are collectively supplied to the power plant 208 in the central facility 200, where they are preferably used as an energy source for obtaining steam 213 and electric power 214. . In the power plant 208, for example,
Electric power 214 can be obtained by burning 12 and utilizing the generated heat for waste heat power generation. The low-pressure steam 213 discharged from the steam turbine of the waste heat power generation can be used as a heat source. If necessary, the power plant 208 is supplied with an appropriate auxiliary fuel (not shown). As such a power plant 208, an existing incineration facility can be used. In addition, the condensate storage tank 209 in FIG.
It is provided as necessary when the concentration equipment 210 is provided in the vicinity of 00, and may not be provided in the present embodiment.

In this embodiment, the step of liquefying the cellulosic waste 1 by the action of an enzyme is performed in the primary treatment facility 100.
The step of producing enzymes and the step of producing valuables using sugar are performed in the central facility 200, and the processing of cellulosic waste is performed by transporting liquid between the two facilities. Even if the discharge sources of the waste 1 are scattered or the amount of the discharge is small, it is possible to rationalize the profit by taking part of the process intensively in the central facility 200. Cellulose waste 1
Even if the number of discharge sources increases, only the primary processing equipment 100 needs to be added or relocated in accordance with the new discharge source, so that low-cost and quick response is possible. If the primary treatment facility 100 is provided close to the factory of the discharge source or the like, utilities such as electric power and clean water can be supplied from the factory at low cost, so that the cost is reduced. Since the transport mode between the two facilities is liquid, the transport efficiency is good, the work of loading and unloading is easy, and transport by pipeline is also possible depending on the conditions.

By concentrating the process using the biological process in the central facility, the capital investment and the operating cost can be reduced. What is carried into the central equipment 200
Since it is not included in the type of waste,
It is clean and requires less restrictions on the location of the central facility 200. In addition, since the enzyme that acts on the cellulosic waste 1 is produced and used in the central facility 200, there is no need to purchase a purified product from the outside. Primary processing equipment 100
Since the requirements for purity and concentration are not so high for the enzymes used in the process, the enzymes produced in the central facility 200 can be supplied without purification, and the cost for enzyme procurement can be greatly reduced. it can. In addition, the transportation cost can be suppressed by performing the transportation of the sugar solution and the transportation of 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 the energy efficiency is good and the transport of the residue 5 is unnecessary. In addition, since the transportation of the sugar-containing liquid from the primary treatment equipment 100 to the central equipment 200 is performed in the form of the concentrated sugar liquid 6 which is concentrated,
The transportation volume is small and the transportation efficiency is good.

Next, a second embodiment of the method for treating cellulosic waste according to 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 description thereof will be omitted. The waste processing system of the present embodiment is significantly different from the first embodiment in that a concentrating facility 210 for performing a concentrating step 104 is provided in the vicinity of a central facility 200. Here, the term “close to the central facility 200” means that the concentrated sugar solution 6 and the condensate 7 can be transferred to the central facility 200 without using transportation means.
The concentrating equipment 210 is also provided at the secondary processing point. Central equipment 2
A concentration facility 210 may be provided in 00. The concentrating equipment 210 has a boiler 1 for burning the residue 5 to recover thermal energy and reusing it for the concentrating step 104.
05 etc. are also provided.

In the present embodiment, the primary treatment facility 110 performs the process up to obtaining the sugar solution 4 by performing the separation process 103 after the saccharification process 102, and transports the sugar solution 4 to the concentration facility 210 in the form of the sugar solution 4 before concentration ( Sugar transporting step 152). It is preferable that the residue 5 generated in the separation step 103 be transported to the concentration facility 210 after performing processing such as drying and solidification as necessary (solid content transportation step 153). In the concentration equipment 210, the sugar liquid 4 is concentrated to be a concentrated sugar liquid 6, and this is supplied to the concentrated sugar liquid storage tank 201 (concentration step 104). Boiler 1
At 05, the residue 5 transported from the primary treatment 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 concentrated at the concentration step 10
4 as a heat source (thermal energy recovery step). Further, the evaporated vapor generated in the concentration step 104 is cooled directly or indirectly, collected as a condensate (condensate) 7, temporarily stored in a condensate storage tank 209, and then used as a supply water for the enzyme plant 209. Preferably, it is reused within the facility 200. The processing steps in the central facility 200 can be the same as in the first embodiment.

As described above, the primary processing facility 110 is configured to perform the process up to the separation step 103, and the equipment for the concentration step 104 and the recovery of thermal energy is provided at the secondary processing point. , The primary processing equipment 110 is simplified and space-saving, and the primary processing equipment 11
0 is easy and low cost. In addition, in the present embodiment, in addition to the sugar transporting step 152 and the enzyme transporting step 151, a solid content transporting step 153 is provided, so that the distance between the primary processing equipment 110 and the central equipment 200 is relatively short, and the primary processing equipment 110 is loaded into the primary processing equipment 110. It is particularly suitable when the amount of the cellulosic waste 1 to be produced is small.

Next, a third embodiment of the method for treating cellulosic waste of the present invention will be described. FIG. 5 is a process diagram for mainly explaining the 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 description thereof will be omitted. The major difference between the waste treatment system of the present embodiment and the first embodiment is that a separation facility 220 for performing the separation step 103 near the central facility 200 and a concentration facility for performing the concentration step 104. 210 is provided. Here, the term “close to the central equipment 200” means that the sugar liquid 4 can be supplied to the concentration equipment 210 and the concentrated sugar liquid 6 and the condensate 7 can be supplied to the central equipment 200 without using transportation means. That is, the separation equipment 220 and the concentration equipment 21
0 is also provided at the secondary processing point. The separation facility 220 and the concentration facility 210 may be provided in the central facility 200. The concentrating equipment 210 is also provided with a boiler 105 and the like for recovering thermal energy by burning the residue 5 and reusing it for the concentrating step 104.

In the present embodiment, in the primary treatment facility 120, the pretreatment 10
After performing 1, the enzyme is allowed to act to start the saccharification reaction,
The reaction solution 10 in the saccharification reaction process is transported to the separation facility 220 (sugar transporting step 154). For example, in a saccharification tank,
The reaction liquid 10 is obtained by supplying the cellulosic waste 1, the enzyme liquid 2, and the makeup water (water 3) and maintaining the reaction conditions set in advance while stirring the inside of the saccharification tank. The reaction solution 10 to be transported may be a reaction solution immediately after the hydrolysis of the cellulosic waste 1 by the enzyme is started, or may be a reaction solution immediately before reaching a predetermined sugar concentration to be subjected to the separation step 103, A reaction solution intermediate between these may be used. Alternatively, the primary treatment facility 120 may be configured with only a saccharification tank, and may be configured to be transported together with the saccharification tank.
In the sugar transporting step 154, the reaction can be allowed to proceed during transport by maintaining the reaction solution during transport under preset reaction conditions. The reaction solution during transport is stirred to some extent due to vibration during transport, but since the reaction is promoted by aggressive stirring, it is more preferable to use a transport unit having a stirring unit. After the sugar transport step 154, the reaction solution 1
0 is supplied to the separation equipment 220, the sugar concentration of the reaction solution 10 is adjusted to a predetermined sugar concentration (5
-10% by weight).

In the separation equipment 220, the transported reaction liquid 10 is subjected to solid-liquid separation, and the solid content is removed as a residue 5.
The sugar solution 4 is obtained (separation step 103). Sugar solution 4 is concentrated equipment 2
The concentrated sugar solution is then supplied to the concentrated sugar solution storage tank 201 (concentration step 104). On the other hand, the residue 5 generated in the separation step 103 is
Of the low-pressure steam 9 discharged from the steam turbine of the waste heat power generation as a heat source to the enrichment step 104 (heat energy recovery step). ). Further, the evaporated vapor generated in the concentration step 104 is cooled directly or indirectly, collected as a condensate (condensate) 7, temporarily stored in a condensate storage tank 209, and then used as a supply water for the enzyme plant 209. Preferably, it is reused within the facility 200.

As described above, the treatment is performed at least until the saccharification reaction by the enzyme is started in the primary treatment equipment 120, and the equipment for the separation step 103, the equipment for the concentration step 104, and the equipment for the recovery of thermal energy are added to the secondary treatment equipment. By providing at the processing point, the primary processing equipment 120 is further simplified and space-saving as compared with the first embodiment and the second embodiment, and the installation of the primary processing equipment 120 is made easier and at lower cost. Become. In the present embodiment, since the reaction liquid 10 is transported from the primary processing point to the secondary processing point in a state, the distance between the primary processing point and the secondary processing point is relatively long, and the reaction liquid 10 is carried into the primary processing equipment 110. It is particularly suitable when the amount of the cellulosic waste 1 is small.
In the present embodiment, the separation step 103, the concentration step 10
Since the step 4 and the thermal energy recovery step are both performed at the secondary treatment point, the step of transporting the residue 5 is unnecessary.

Further, as shown in FIG. 5, if a central facility 200, a separation facility 220, and a concentration facility 210 are provided at the secondary treatment point, the place where the cellulosic waste 1 is discharged and the secondary facility are separated. It is also possible to construct one system by combining the first to third embodiments according to the distance from the treatment point and the size of the discharge amount. For example, a relatively large-scale emission source such as a factory is provided with a primary treatment facility 100 for performing the enrichment step 104 as in the first embodiment, and a relatively small-scale emission source according to the second embodiment is provided. And a primary treatment facility 110 for performing only the saccharification step 102 as in the third embodiment at a relatively small and distant discharge source. It is also possible to transport the sugar-containing liquid in a form corresponding to the processing step in each facility from the primary treatment facilities 100, 110, 120 to one secondary treatment point.

[0031]

As described above, according to the present invention,
Rather than performing the entire process of saccharifying the cellulosic waste treatment and producing valuables from the saccharified liquid in one place, the saccharification step of producing sugar by reacting the cellulose-based waste with an enzyme at the first treatment point The fermentation step and the enzyme production step using the obtained sugar are performed at the second treatment point, and the sugar-containing liquid is transported from the first treatment point to the second treatment point, and conversely, the second treatment point is performed. By transporting the enzyme from the point to the first treatment point, it is possible to saccharify the cellulosic waste and to increase the efficiency and cost of a series of processes for producing valuable materials from the obtained sugar. . This greatly enhances the feasibility of recycling cellulosic waste with this treatment method. Further, by using the thermal energy obtained by burning the solids (residue) generated in the saccharification step in the system, the waste of the thermal energy can be reduced and the cost can be further reduced. Furthermore, by making the enzyme transported in the enzyme transporting step liquid, and performing the enzyme transporting step and the sugar transporting step 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 illustrating an example of a waste treatment system according to a first embodiment of the present invention.

FIG. 2 is a process chart for explaining processing at a primary processing point according to the first embodiment of the present invention.

FIG. 3 is a process chart for explaining processing at a secondary processing point according to the first embodiment of the present invention.

FIG. 4 is a process chart for explaining processing at a primary processing point according to a second embodiment of the present invention.

FIG. 5 is a process chart for explaining processing at a primary processing point according to a third embodiment of the present invention.

[Explanation of symbols]

1. Cellulose waste, 2. Enzyme solution, 4. Sugar solution, 5.
Residue (solid content), 6: concentrated sugar solution, 10: reaction solution, 10
0, 110, 120: primary treatment equipment, 102: saccharification step, 103: separation step, 104: concentration step, 105: boiler (combustion means), 150, 152, 154: sugar transport step, 151: enzyme transport step, 153 … Solids transport process, 200 central equipment, 210 concentration equipment, 220 separation equipment.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B09B 3/00 303J F-term (Reference) 4B064 AC03 AD33 CA21 CC03 CD23 DA16 4D004 AA12 AA46 AC05 BA03 BA06 CA13 CA15 CA18 CA20 CA28 CB21 CB45 CC07

Claims (12)

[Claims] 1. A saccharification step in which an enzyme is acted on a cellulosic waste at a primary treatment point to produce sugar, and a saccharide-containing liquid containing the saccharide produced in the saccharification step is subjected to a secondary treatment different from the primary treatment point. A sugar transporting step of transporting to the processing point, a fermenting step of performing fermentation using the sugar at the secondary processing point, an enzyme producing step of producing an enzyme at the secondary processing point, And a step of transporting the enzyme to the primary treatment point. 2. A separation step of performing solid-liquid separation after the saccharification step at the primary treatment point to obtain a sugar liquid from which solids have been removed; and concentrating the sugar liquid obtained in the separation step at the primary treatment point. A method for treating a cellulose-based waste according to claim 1, further comprising a concentration step of obtaining a concentrated sugar liquid by carrying out the method. 3. The method according to claim 1, further comprising a heat energy recovery step of burning the solid matter removed in the separation step at the primary treatment point to obtain heat energy and supplying the heat energy to the concentration step. The method for treating cellulosic waste according to claim 2. 4. A separation step in which solid-liquid separation is performed after the saccharification step at the primary treatment point to obtain a sugar liquid from which solids have been removed, and the sugar liquid obtained in the separation step at the secondary treatment point is A cellulose-containing liquid transported in the sugar transporting step, wherein the sugar-containing liquid transported in the sugar transporting step is the sugar liquid obtained in the separation step. Waste treatment method. 5. A solid content transporting step of transporting the solid content removed in the separation step to the secondary processing point, and burning the solid content at the secondary processing point to obtain thermal energy. The method for treating cellulosic waste according to claim 4, further comprising a thermal energy recovery step of supplying the wastewater to the concentration step. 6. 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, and after the saccharification step at the secondary treatment point. A separation step of performing a solid-liquid separation to obtain a sugar liquid from which solids have been removed; and a concentration step of concentrating the sugar liquid obtained in the separation step at the secondary treatment point to obtain a concentrated sugar liquid. The method for treating cellulosic waste according to claim 1, characterized in that: 7. The method according to claim 7, further comprising a step of burning the solid matter removed in the separation step at the secondary treatment point to obtain heat energy and supplying the heat energy to the concentration step. The method for treating cellulosic waste according to claim 6. 8. The method according to claim 1, wherein the enzyme transported in the enzyme transporting step is in a liquid state, and the enzyme transporting step and the sugar transporting step are carried out by using the same transporting means. A method for treating a cellulosic waste according to any one of the above items. 9. The method for treating cellulosic waste according to claim 1, wherein said cellulosic waste is waste paper or waste containing waste paper. 10. The method for treating cellulosic waste according to claim 1, wherein the enzyme is a cellulase containing endoglucanase. 11. The method according to claim 1, wherein L-lactic acid is produced in the fermentation step. 12. The method for treating cellulosic waste according to claim 1, wherein ethanol is produced in said fermentation step.