JP2017006891A - Waste treating method for providing useful substance by using biomass in waste as raw material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating waste which permits efficient and stable energy recovery.SOLUTION: A method for treating waste for providing a useful substance by using biomass in waste as raw material includes: a fractionation process (1) for separating the waste into heavy-weight material and light-weight material; a process (2) for recovering paper pulp by separating dissociative massive foreign material from slurry obtained from the light-weight material; an ethanol fermentation process (3) for fermenting the whole amount or a part of the paper pulp and a part of the heavy-weight material as ethanol fermentation raw material to obtain an ethanol-containing solution; and a distillation process (4) for distilling the ethanol-containing solution to obtain ethanol. Therein, prior to the process (3), a distribution process for distributing the paper pulp and the heavy-weight material which are to be projected to the process (3) is further included and, in the distribution process, the proportion of the heavy-weight material and the paper pulp is adjusted based on a dry weight ratio of paper pulp/the heavy-weight material, or a solid content concentration of ethanol fermentation raw material is adjusted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste treatment method for recovering biomass in waste and obtaining a useful product by using a part of the biomass as an ethanol raw material, and the present invention produces ethanol from a part of the biomass thus recovered. In addition, the present invention relates to a waste treatment method for obtaining a useful material from biomass in waste as a raw material, in which biogas is produced by methane fermentation from the generated ethanol distillation residue and the remaining biomass.

  In recent years, the creation of new environmentally friendly energy has been demanded worldwide due to energy problems such as depletion of fossil resources and environmental problems such as global warming. Among them, the creation of carbon neutral energy from biomass is sustainable, and in particular, utilization of waste biomass is required for a highly social life.

  In Japan, more than half of the approximately 34 million tons of general waste that is incinerated is biomass, such as moss and paper. In addition, along with the promotion of 3R (Reduce, Reuse, Recycle), the proportion of high-calorie waste such as plastics is decreasing, while the proportion of moss is increasing The proportion of moist garbage that is not suitable for incineration is increasing.

  One of the methods often used when using miscellaneous biomass is methane fermentation. Biomass containing methane is produced by fermenting biomass under anaerobic conditions, and can be used as raw fuel. Also, papers contained in general waste cannot be recycled into recycled paper due to dirt and odors if they are collected and mixed, but they are delignified cellulose, which is a good biomass. It can be said that it is a raw material.

  In addition, as a method of using paper contained in general waste as an ethanol raw material, methods for recovering paper from waste as an ethanol raw material as shown in Patent Documents 1 and 2 have been studied.

  Furthermore, ethanol is produced from food waste, which is industrial waste, and the distillation residue is subjected to methane fermentation, and studies are being made on fuel conversion of waste in two stages (Non-patent Document 1).

  Here, the characteristics of each raw fuel are listed. Ethanol is a liquid fuel that is easier to handle than gas, and some existing facilities can be diverted when used as fuel for automobiles and boilers. is there. Moreover, it can be used as a chemical raw material as a substance, and ethanol-derived polyethylene, ethyl acetate, and the like currently exist on the market. Ethanol is produced within a few days by ethanol-fermenting microorganisms such as yeast from cellulose-derived saccharification products in biomass or saccharification products of cellulose and cereal-derived starch contained in fiber derived from straw.

  Biogas can be used for applications such as natural gas automobile fuel and pipe injection after refining and adjusting the amount of heat, for example, as a direct fuel for power generation. Synthetic organic materials such as plastic cannot be decomposed as raw materials, but biomass-derived organic materials can be used as raw materials, and the reaction time is said to be 15 to 30 days.

  The present inventors collect biomass from waste, particularly general waste, use it as a raw material for producing ethanol, and convert and collect residual organic substances contained in the obtained distillation residue into biogas by methane fermentation Studying the two-stage fuel to do, has been aiming to collect more energy and increase the value of waste-derived raw fuel.

JP 2002-159953 A JP 2010-246421 A

Koike Y, An MZ, Tang YQ, Syo T, Osaka N, Morimura S, Kida K, "Production of fuel ethanol and methane from garbage by high-efficiency two-stage fermentation process.", J Biosci Bioeng, 2009, 108, No. 6, p. 508-12

  As described in the background, the present inventors produced ethanol from the biomass derived from waste, using the recovered biomass, and conducted methane fermentation using the distillation residue remaining after the recovery of ethanol as a raw material, The goal was to recover more energy by producing biogas.

  Biomass raw materials for ethanol production are first composed of heavy waste mainly composed of biomass such as moss and wet paper, and mainly plastics, vinyl and dry paper by mechanical separation of waste. Paper pulp obtained by separating into light weight products, adding water to the obtained light weight materials, disaggregating the paper, separating the lump-shaped foreign matter such as plastics and vinyls, etc. The total amount of pulp and the heavy weight obtained from the first mechanical fractionation were to be used.

  For example, in Patent Document 2, an ethanol production process is attached to a waste incineration facility, and heavy waste is incinerated. However, since heavy waste has a high moisture content, if incineration is performed, the combustion state of the waste incineration facility There was a problem that was not stable.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a waste processing method that realizes efficient and stable energy recovery.

  In order to solve the above-mentioned problems, the present inventors have intensively studied, and as a result, the following invention has been completed.

That is, the present invention is a waste processing method for obtaining useful materials using biomass in waste as a raw material,
(1) A separation step of separating into a heavy product containing at least a cocoon component and a wet cellulose component and a light product containing another biomass component by fractionation by weight using a machine;
(2) adding water to the lightweight material, disaggregating the cellulose component contained in the lightweight material, and recovering paper pulp by separating non-disintegrating massive foreign substances from the obtained slurry;
(3) An ethanol fermentation process in which an ethanol-containing solution is obtained by fermenting the whole or part of the paper pulp obtained in the step (2) and a part of the heavy product obtained in the step (1) as an ethanol fermentation raw material. When,
(4) a distillation step of obtaining ethanol by distilling the ethanol-containing solution,
Before the step (3), the method further includes a distribution step of distributing the paper pulp and heavy material to be input into the step (3), and the weight to be introduced into the step (3) in the distribution step. The ratio of the product and the paper pulp is adjusted based on the dry weight ratio of the paper pulp / the heavy product, or the solid content concentration of the ethanol fermentation raw material is adjusted.

  Preferably, the method further includes a step of producing biogas by methane fermentation of the distillation residue generated in the step (4) and the remaining biomass not input in the step (3).

  Preferably, in the distributing step, the whole amount of the paper pulp obtained in the step (2) is charged into the step (3), and a part of the heavy article obtained in the step (1) is the (3). ) Adjust to be put into the process.

  Preferably, in the step (3), ethanol is produced by semi-batch simultaneous saccharification and fermentation.

  Preferably, in the distribution step, each amount is adjusted so that the paper pulp / heavy weight is in a range of 1.8 to 35.0 in a dry weight ratio.

  Preferably, in the distribution step, the solid content concentration of the ethanol fermentation raw material is adjusted to 18.0 to 23.3%.

  According to the waste treatment method of the present invention, since the proportion of components introduced into the ethanol fermentation process is appropriately adjusted, the amount of ethanol produced per unit raw material increases, and accordingly the running cost during ethanol production is reduced. I can do it.

  Moreover, the solid content concentration at the time of the reaction decreases due to the reduction in the mixing ratio of heavy materials, and the initial cost can be reduced due to the reduction in equipment requirements for stirring, and the running cost required for stirring power can be reduced.

  Higher reproducibility and stable reaction can be achieved by increasing the mixing ratio of paper pulp that is relatively uniform compared to heavy objects with large variations in moisture content and composition, and the remaining biomass components are converted to biogas. This makes it possible to use fuel.

It is a processing flowchart explaining the form for implementing this invention. It is a figure explaining the ethanol fermentation process by semi-batch type saccharification and fermentation. It is a graph which shows the result of the simultaneous saccharification fermentation reaction (henceforth SSF reaction) in the laboratory scale using each raw material in Example 1. FIG. In Example 2, it is a graph which shows the result of having implemented simultaneous saccharification and fermentation reaction on the same conditions as Example 1 on the raw material conditions of (7)-(9) and (1). It is a graph which shows the ethanol amount ratio produced | generated per the amount of enzyme used. In Example 3, it is a graph which shows the biogas generation amount in the methane fermentation using a distillation residue. In Example 4, it is a graph which shows the biogas generation amount in the methane fermentation using a heavy article.

  Hereinafter, a waste treatment method for obtaining a useful product from biomass in waste according to the present invention will be described in detail with reference to the drawings as appropriate.

  FIG. 1 is a process flow diagram illustrating an embodiment for carrying out the present invention.

[waste]
Specifically, an object of the present invention is to efficiently recover ethanol and biogas mainly composed of methane, which are useful materials by treating waste. Therefore, from this viewpoint, the origin of the waste in the present invention is not particularly limited as long as it contains a cellulose component (paper), a cocoon component, and the like as raw materials.

  More specifically, examples of the waste include general waste and industrial waste including business and household systems such as waste paper, paper sludge, and food waste. Moreover, you may obtain separately the raw material which contains many papers, and the raw material which contains many potatoes. It should be assumed that the waste varies depending on the region, season, and climate (sunny / rainy).

[Useful]
In the present invention, useful materials are those obtained by fermentation using the cellulose component (papers), cocoon component, etc. contained in the above waste as raw materials, specifically, ethanol obtained by saccharification and ethanol fermentation, And biogas containing methane obtained by methane fermentation. However, as long as the biomass contained in the waste can be obtained as a raw material, other materials may be used without being limited to the above.

[Separation by weight using machines (machine sorting)]
First, waste is sorted by weight. Since it is convenient to perform separation by weight using a machine in the separation step here, separation by weight using a machine (hereinafter simply referred to as machine separation) will be described below.

  The mechanical separation is performed for the purpose of taking out the soot component and the wet paper (cellulose component) from the waste as a heavy material. This mechanical separation is basically carried out if the waste is mixed and collected. By this separation, the waste components in the waste and the wet paper are used as heavy materials, and the plastics are biomass components other than these. Kinds, vinyls, and papers that are not wet are classified as lightweight.

  Examples of the mechanical separation include a method of mechanically separating using specific gravity. However, the separation is not particularly limited as long as the above-described separation by weight can be performed. For example, when selecting mechanically by wind power, it is conceivable that a light lightweight object will fly farther than a heavy object having a heavy specific gravity.

  Moreover, when the form of waste exists in the shape of a bag, a crushing process for the purpose of breaking the bag can be performed in the preceding stage.

  In addition, since the purpose is to remove the cocoon component and moist paper (cellulose component) from the waste as a heavy material, the size of a screen, etc. is used to eliminate large lumps, sheets, strings, etc. Removal can be provided downstream.

<Handling of lightweight materials>
[Disaggregation process]
In a lightweight product obtained by mechanical separation, the paper component includes components other than paper, such as a bonded portion such as laminating and backrest, and bonding with plastic. By adding water to a lightweight material with a pulper and mixing, only the paper component is disaggregated into a pulp slurry, and the other components (such as plastic) that do not disaggregate are removed. Although it is the same process as the pulping process performed in paper recycling, it is not necessary to remove foreign substances as strictly as in recycling. The obtained paper pulp slurry is dehydrated and recovered as paper pulp. The weight can be measured using a conveyor or load cell having a weighing function. Here, the paper pulp is preferably sampled and measured for dry weight, solid content concentration, moisture content, and the like.

  After the measurement, the whole or part of the paper pulp is transferred to a reaction tank for ethanol production in a later step by the paper pulp distributor. Since the paper pulp can be obtained in a uniform state when dehydrated from the slurry and adjusted, the water content of the paper pulp can be used as a set value of 35% ± 10%. The lightweight material used for mixing can be measured by a weighing device using a conveyor or load cell having a weighing function.

  In addition, as for a lightweight thing, you may add separately the fraction containing the papers obtained by another line, and the raw material containing many papers described in the above-mentioned raw material.

  The removed plastic or the like is preferably incinerated at a waste incineration facility attached to an ethanol fermentation facility.

<Treatment of heavy items>
[Distribution process in heavy goods distribution section]
Heavy goods obtained by mechanical separation are composed mainly of cocoons and wet paper. The weight of the heavy object is preferably measured using a conveyor or a load cell having a weighing function. Here, it is preferable that the heavy object is sampled and the dry weight, the solid content concentration, and the like are measured. Then, after the measurement, the whole or a part of the heavy material is transferred to the reaction tank for ethanol production in a later process by the paper pulp distributor.

  Heavy products are necessary as nutrients for yeast in ethanol fermentation, but heavy products have some obstacles to yeast, and if there are too many heavy products in the raw materials for ethanol fermentation, the amount of yeast to be added must be increased. There was a problem to say.

  Accordingly, in the present invention, the ratio of the heavy material to be charged for ethanol fermentation is adjusted from the dry weight ratio or solid content concentration of the paper pulp / the heavy material, and a part of the heavy material is used for ethanol production. Will be transferred to the reaction tank. The other heavy material that has not been transferred to the reaction vessel is transferred to the reaction vessel for methane fermentation or stored for subsequent batch processing.

  In addition, it is preferable to measure the moisture content of a heavy article by daily work. A heavy object used for mixing can be measured by a weighing device using a conveyor or a load cell having a weighing function.

[Ethanol fermentation process]
A paper pulp and a heavy product are fermented as an ethanol fermentation raw material to obtain an ethanol-containing solution. The higher the solid content concentration during the reaction, the higher the ethanol concentration of the fermented liquor, and the lower the energy and time required for distillation. Therefore, it is desirable to be a simultaneous saccharification and fermentation reaction that can carry out the reaction at a high concentration. Enzymes such as cellulase and amylase used for saccharification and yeast used for fermentation are not particularly limited as long as hydrolysis of cellulose or amylose or ethanol fermentation of sugar is possible.

  In the ethanol fermentation process, the dry weight ratio or solid content concentration of paper pulp / heavy weight may be adjusted to a desired value by supplying water. Here, it is preferable to use the waste water of the disaggregation process as water for water supply. The waste water in the disaggregation process contains about 0.5% by weight of paper pulp, but it is not a value that affects the dry weight ratio of the paper pulp / the heavy article.

[Ethanol fermentation process by semi-batch simultaneous saccharification and fermentation]
The ethanol fermentation process can be produced by simultaneous saccharification and fermentation, but may be an ethanol fermentation process by semi-batch simultaneous saccharification and fermentation.

  The ethanol fermentation process by semi-batch saccharification and fermentation will be described with reference to FIG.

  For the first SSF reaction, raw materials are charged into the reaction tank, and then enzymes and yeast are charged. About a part (about half) of the fermented rice cake (ethanol containing solution) obtained after performing SSF reaction, it is sent to distillation for collect | recovering ethanol. The remaining part of the reaction solution is left in the same reaction tank in the state containing the enzyme and yeast to perform the second SSF reaction, and new raw materials are newly added to replenish the diverted portion. In addition, the enzyme and yeast are also supplemented and the second SSF reaction is performed.

  The same operation is performed for the third and subsequent SSF reactions.

[Method for adjusting ethanol fermentation process]
In one embodiment, in the ethanol fermentation process, the paper pulp / heavy weight is adjusted to be 1.8 to 35.0 by dry weight ratio.

  For this purpose, the dry weight ratio is calculated from the paper pulp and heavy material measured by sampling, and the whole or a part of each raw material is taken and mixed in a reaction vessel.

  In another embodiment, in the ethanol fermentation process, the solid content concentration of the ethanol fermentation raw material is adjusted to be 18.0% to 30.7%.

  For this purpose, the solid content is calculated from the paper pulp and heavy material measured by sampling, and the whole or a part of each raw material is taken and mixed in a reaction vessel. In order to adjust the solid content concentration, necessary adjustment water is added from the solid content of each raw material mixed.

[Distillation process]
Distill the fermented rice cake obtained by ethanol fermentation. The distillation residue remaining after distillation is transferred to the methane fermentation process, which is the next process. Here, as for the energy for distillation, it is preferable to distill the fermented rice cake using the heat of boiler steam, waste heat from incineration, etc. attached to the ethanol fermentation facility.

  For heavy products, based on the weight of the paper pulp input to the ethanol fermentation process, a part of the heavy product obtained from the dry weight ratio or solid content concentration of the paper pulp / the heavy product is used for ethanol production. It is transferred to the reaction tank. The other heavy product is transferred to a reactor for methane fermentation or stored for subsequent batch processing.

[Methane fermentation]
Methane fermentation may be carried out by any method as long as it can handle heavy materials and distillation residues. However, since it is expected that foreign substances are included to some extent due to the origin of raw materials, it may be dry methane fermentation. preferable.

  Moreover, when classified according to the fermentation temperature range, there are medium temperature fermentation in which the reaction is carried out at around 35 ° C and high temperature fermentation in which the reaction is carried out at around 55 ° C. However, it is more preferable because the reaction rate can be increased. However, when the composition ratio of moss is high and the influence on ammonia inhibition is large, it can be considered that the medium temperature fermentation is performed.

  Hereinafter, the present invention will be described specifically by way of examples.

(Example 1: Influence investigation at the time of heavy material mixing)
The general waste generated in the local government was mechanically separated into heavy and light wastes, and the light wastes were further subjected to a disaggregation process to obtain paper pulp. A simultaneous saccharification and fermentation reaction was performed using a mixed raw material obtained by mixing the obtained heavy material and paper pulp at a generation ratio to generate ethanol.

  Cellulase manufactured by Novozymes was used as the enzyme for hydrolysis, and Saccharomyces cerevisiae was used as the fermentation microorganism.

  In order to compare the effects of mixing heavy objects, various mixed raw materials were prepared with various mixing ratios of heavy objects and paper pulp.

  In Table 1, it shows about the density | concentration in a mixed raw material about each of (1)-(6). In addition, (1)-(3) mixes with the generation | occurrence | production ratio of various general wastes, and has the meaning as a comparative example. On the other hand, (4) to (6) were prepared by mixing the raw materials used in (1) to (3) so that the solid content concentration was 15% paper pulp and 5% by weight, respectively. Used as a raw material for simultaneous saccharification and fermentation reaction. Therefore, (4) to (6) are examples consistent with the method of the present invention.

  This mixing ratio is equivalent to the potential amount of sugar in each raw material of (1) to (3). The enzyme amount and yeast amount used for each reaction of (1) to (6) were all carried out by adding constant amounts. The reaction temperature was 38 ° C. for all examples.

  The result of the simultaneous saccharification and fermentation reaction (hereinafter referred to as SSF reaction) on a laboratory scale using the raw materials (1) to (6) is shown in FIG.

  Looking at the results at 72 hours after the start of the reaction, the ethanol concentration was about 4% in (1) to (3). In (4) to (6) where the mixing ratio of heavy materials is low, the latent amount of sugar is the same as that in each of (1) to (3), and the amounts of enzyme and yeast used are the same. Since the ethanol production rate was obviously high, a result of 5% or more was obtained, and the reaction was almost completed.

  If time is taken, the value may be close, but if the reaction time is lengthened, the amount of raw material that can be processed per reaction tank will be reduced. It was shown that more ethanol was produced at the same running cost when the ratio was reduced.

(Example 2: Examination of weight mixture ratio)
According to Example 1, it was confirmed that when the mixing ratio of heavy materials was high, a decrease in the amount of ethanol conversion and a decrease in the reaction rate were observed. Then, the same thing as what was used for (1) as a raw material was used, and the relationship with the ethanol production amount by the difference in the mixing ratio of a paper pulp and a heavy article was investigated.

  Table 2 below shows the mixing ratio of the raw materials standardized with the same raw material type as (1) and with a slightly increased sugar potential.

  FIG. 4 shows the results of the simultaneous saccharification and fermentation reaction under the same conditions as (1) under the raw material conditions (7) to (10).

  As is apparent from FIG. 4, the ethanol concentration reached 5% at any mixing ratio at 72 hours after the start of the reaction. In addition, in order to strictly compare the amount of ethanol produced, the amount of produced ethanol per amount of enzyme used was calculated using the test results at 72 hours after the start of the reaction, and the ratio expressed based on Comparative Example 1 is shown in FIG. As shown in FIG.

  In any case, the ethanol amount ratio was higher than that in (1) in which heavy objects were mixed at a high concentration, and the ratio increased as the mixing ratio of heavy objects decreased.

  From the results of Examples 1 and 2, the ratio of paper pulp / heavy weight of the mixed raw material is preferably in the range of 1.8 to 35.0, more preferably 3.0 to 10.0 in terms of dry weight ratio. it was thought.

  Similarly, the solid content concentration of the mixed raw materials was preferably 18.0 to 30.7%, and more preferably 18.7 to 23.3%.

  In addition, energy recovery can be achieved by using a heavy material that can no longer be processed as a substrate for methane fermentation in which a distillation residue is processed at a later stage.

(Example 3: Methane fermentation of distillation residue)
In the ethanol fermenter, unreacted residues and organic substances that are difficult to be converted into ethanol remain, and it is considered possible to produce biogas using the distillation residue as a raw material. This was confirmed in the following examples.

  An anaerobic treatment was performed at a treatment temperature of 53 ° C. using a 2 L separable flask. The seed sludge used for fermentation used the sludge accustomed for a long time by the present inventors.

  The raw material used was the distillation residue of the ethanol fermented rice cake generated in Examples 1 and 2. The solid content concentration was adjusted to 20-25% and used so that the residence time was 20-25 days. After acclimatizing the seed sludge with a low load, the load was gradually increased from 4.0 g / kg / day to Volatile Total Solids (hereinafter referred to as VTS load). Once a day or every two days, a distillation residue was introduced from the top of the separable flask, and excess sludge was appropriately extracted so that the weight of the fermentation broth became 1 kg.

  Each load is about 1 to 2 weeks. When the amount of biogas generated is stable, the load is repeatedly increased, and a VTS load of 10.0 g. Up to kg / day. The result of the average value of the biogas generation amount in each load is shown in FIG.

  As shown in FIG. 6, the biogas generation amount increased linearly as the load increased. In addition, the amount of biogas generated per load remained almost constant, although there was a tendency to decrease slightly as the load increased. Thus, it was confirmed that biogas was stably generated only from the distillation residue.

(Example 4: Heavy methane fermentation)
In Example 3, biogas generation from the distillation residue was confirmed. On the other hand, from the results of Examples 1 and 2, since a part of the heavy material is used as the ethanol fermentation raw material, the remaining heavy material remains. Since it was considered to use this as a biogas raw material together with the distillation residue, heavy methane fermentation used in Examples 1 and 2 was performed in this example.

  An anaerobic treatment was performed at a treatment temperature of 53 ° C. using a 2 L separable flask. The seed sludge used for fermentation used the sludge accustomed for a long time by the present inventors. After acclimatizing the seed sludge with a low load, the load was gradually increased from a VTS load of 5.5 g / kg / day. Once a day or every two days, a heavy material was introduced from the top of the separable flask, and excess sludge was appropriately extracted so that the weight of the fermentation broth became 1 kg. Each load is about 1 to 2 weeks, and when the amount of generated biogas is stable, the load is repeatedly increased to obtain a VTS load of 10.4 g. Up to kg / day. The raw materials were used by adjusting the solid content concentration to 20-30% so that the residence time was 20-25 days.

  The result of the biogas generation amount in each load is shown in FIG. As a result, as the load increased, the amount of biogas generated increased, but the amount of biogas generated per load clearly showed a decrease in the amount generated as the load increased. A heavy product is not uniform as a raw material as compared with a distillation residue, and therefore, one of the causes is considered to be a large error on a scale of 1 kg. In any case, it was confirmed that biogas was stably generated using only heavy materials as raw materials. From the results of Examples 3 and 4, it was confirmed that methane fermentation using only the distillation residue and heavy material as raw materials could be confirmed, so that anaerobic treatment was possible at any mixing ratio.

Claims (6)

A waste processing method for obtaining useful materials from biomass in waste as a raw material,
(1) A separation step of separating into a heavy product containing at least a cocoon component and a wet cellulose component and a light product containing another biomass component by fractionation by weight using a machine;
(2) adding water to the lightweight material, disaggregating the cellulose component contained in the lightweight material, and recovering paper pulp by separating non-disintegrating massive foreign substances from the obtained slurry;
(3) An ethanol fermentation process in which an ethanol-containing solution is obtained by fermenting the whole or part of the paper pulp obtained in the step (2) and a part of the heavy product obtained in the step (1) as an ethanol fermentation raw material. When,
(4) a distillation step of obtaining ethanol by distilling the ethanol-containing solution,
Before the step (3), the method further includes a distribution step of distributing the paper pulp and heavy material to be input into the step (3), and the weight to be introduced into the step (3) in the distribution step. The waste processing method characterized by adjusting the ratio of a thing and paper pulp based on the dry weight ratio of the said paper pulp / the said heavy thing, or adjusting the solid content concentration of an ethanol fermentation raw material.   The waste treatment according to claim 1, further comprising a step of producing biogas by methane fermentation of the distillation residue generated in the step (4) and the remaining biomass not input in the step (3). Method.   In the distribution step, the entire amount of the paper pulp obtained in the step (2) is charged into the step (3), and a part of the heavy material obtained in the step (1) is transferred to the step (3). The waste treatment method according to claim 1, wherein the waste is treated so as to be charged. In the step (3), ethanol is produced by semi-batch simultaneous saccharification and fermentation.
The waste treatment method according to claim 1.   The disposal according to any one of claims 1 to 4, wherein in the distribution step, each amount of paper pulp / heavy matter is adjusted to be in a range of 1.8 to 35.0 in a dry weight ratio. Material processing method.   The waste disposal method according to any one of claims 1 to 5, wherein in the distribution step, a solid content concentration of the ethanol fermentation raw material is adjusted to 18.0 to 23.3%.

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