JP2011217639A - Fermentation system utilizing fermentation bag and method for producing ethanol - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy and low-cost technique for producing ethanol by utilizing a plastic bag in a series of steps of storage of a raw material, saccharification, fermentation, distillation, and further preservation, transportation, or the like of a distillation residue.SOLUTION: The fermentation system utilizing a fermentation bag includes: the fermentation bag formed from the plastic bag having water resistance and flexibility, storing the fermentation raw material, and carrying out saccharification and ethanol fermentation; and a distillation unit including heating means for heating the fermentation bag, air-feeding means for feeding air to fermented unrefined lees in the fermentation bag, and a cooling trap for capturing the air discharged from the fermentation bag by cooling water, and extracting ethanol from the fermented unrefined lees in the fermentation bag.

Description

  The present invention relates to a fermentation system and an ethanol production method, and more particularly, to a fermentation system and an ethanol production method using a fermentation bag in place of tanks and containers used for saccharification, fermentation, distillation, storage and the like.

  Conventional ethanol production requires large equipment such as storage tanks and fermenters. A large capital investment requires a great deal of cost, and in Japan it cannot be operated without subsidies from the country.

Therefore, various proposals have been made to use a plastic bag in place of a storage tank or a fermenter that requires a large capital investment when carrying out ethanol production. For example, in Japanese Patent Application Laid-Open No. 2006-174728, water hyacinth is made into chips, lactic acid bacteria and saccharides are added to chips that have been squeezed and dehydrated to destroy the tissue, and the mixture is put into a plastic bag to make the contents. A method for processing and utilizing water hyacinth to obtain silage by performing rapid lactic acid fermentation in a state has been disclosed (Patent Document 1).

  Japanese Patent Application Laid-Open No. 2004-97330 discloses that in a pure culture koji using a film-made closed container, the film-made closed container is provided with a filtration filter, a check valve, and an exhaust port. An culturing apparatus and a culturing method have been disclosed in which the inside of the apparatus can be evacuated so that a heat sterilization operation such as an autoclave can be performed while the raw material is placed in a closed film container (Patent Document 2).

JP 2006-174728 A JP 2004-97330 A

  Conventional ethanol production mostly employs a so-called liquid fermentation method in which the moisture content of the fermented mash is 70% or more, so a container having a certain shape (for example, a stainless steel tank) to handle the liquid, etc. In the present situation, the plastic bag can be used only for the production of a solid koji that requires a small amount of water and the lactic acid fermentation at the time of silage production.

  However, ethanol fermentation is not necessarily performed in a container having a fixed shape as long as it can maintain a constant temperature and an anaerobic state. Moreover, if a series of steps such as raw material storage, saccharification, fermentation, distillation, and storage and transportation of distillation residue can be carried out by simple means without using large-scale equipment, the production cost of ethanol can be reduced. It is expected to lead to a decline.

  In recent years, the expectation to bioethanol as one of alternative energy is increasing. Ethanol is produced in Japan and overseas using carbohydrates, starches, and cellulosic raw materials, but profitability has become an important issue for practical use. In particular, the cost of manufacturing and installing equipment necessary for pretreatment, fermentation, and distillation is large, and reduction of initial investment is a problem.

  Therefore, the present invention aims to provide a simple and low-cost ethanol production technology using a plastic bag in a series of processes such as raw material storage, saccharification, fermentation, distillation, and preservation and transportation of distillation residue. And

  In order to solve the above-mentioned problems, the present invention consists of a water-resistant and flexible plastic bag, contains a fermentation raw material, a fermentation bag for performing saccharification and ethanol fermentation, a heating means for heating the fermentation bag, fermentation A distillation unit that extracts air from the fermentation mash in the fermentation bag, comprising air supply means for supplying air to the fermentation mash in the bag and a cooling trap for capturing the air discharged from the fermentation bag with cooling water. And a fermentation system using a fermentation bag.

  The present invention also includes a fermentation process in which fermentation raw materials are put into a fermentation bag made of a water-resistant and flexible plastic bag, and saccharification and ethanol fermentation are performed in the fermentation bag, and after completion of the fermentation, the fermentation bag is heated. The distillation process of distilling ethanol from the fermentation mash in the fermentation bag by supplying air to the fermentation bag and capturing the air discharged from the fermentation bag with cooling water, ethanol production using the fermentation bag Provide a method.

  According to the fermentation system and ethanol production method using the fermentation bag of the present invention, since the plastic bag is used in a series of processes such as raw material storage, saccharification, fermentation, distillation, and storage and transportation of distillation residue, Since a raw material storage tank, a saccharification tank, a fermenter, a distillation apparatus and the like are not required and refilling of the raw material is not required, transportation can be simplified. As a result, simple and low-cost ethanol production can be realized.

It is a figure which shows the outline | summary of the fermentation system of this embodiment. It is a figure which shows the outline | summary of the distillation unit used at the ethanol extraction process of this embodiment.

  FIG. 1 is a diagram showing an outline of a fermentation system using a fermentation bag according to an embodiment of the present invention. The fermentation bag 10 used in the present embodiment is made of a plastic bag having water resistance and flexibility, and contains the fermentation raw material 12 for saccharification and ethanol fermentation.

  In this embodiment, “polybag” means a bag made of a film made of a polymer such as polyethylene, polypropylene, polyvinyl chloride, polyolefin, etc., and has water resistance and flexibility as described above. There is no particular limitation as long as it is a plastic bag, and any type of plastic bag may be used. Also, the capacity does not matter.

  In addition, it is preferable that the fermentation bag 10 is formed with the raw material which can visually recognize the contents. If the contents can be visually confirmed, the storage state of the fermentation raw material 12, the progress of saccharification and fermentation, the distillation state, the storage state of the distillation residue, and the like can be visually observed, and any abnormality can be dealt with immediately.

  The fermentation bag 10 is preferably formed with an air hole a having a diameter of 10 to 50 mm in order to discharge the gas generated during the fermentation to the outside of the fermentation bag 10. Since carbon dioxide is generated when ethanol fermentation progresses, the formation of the air hole a causes the fermentation bag 10 to expand with carbon dioxide, which reduces the strength of the fermentation bag 10 and does not withstand the gas pressure. Inconveniences such as tearing can be prevented.

  Instead of forming the air holes a in the fermentation bag 10, a plastic bag using a film having gas permeability can also be used.

  The fermentation raw material 12 is not particularly limited as long as it contains starch and can serve as a substrate for ethanol fermentation. Cooking residues discharged from foodstuffs, restaurants, lunch centers, etc. can also be used. When rice is used as a fermentation raw material, one or more types selected from the group consisting of glutinous rice, brown rice, embryo rice (germ polished rice), white rice (milled rice, polished rice), waste rice, and rice bran can be used.

  Here, “sticky rice” refers to seeds that have been threshed from harvested rice ears. “Brown rice” refers to the one after the rice husk has been removed from the rice. The “germ rice (germ-milled rice)” means the one that has been polished so that only the cocoon layer of the brown rice is removed and the germ remains. “White rice (milled rice, polished rice)” means a product obtained by removing the straw layer and the germ from the brown rice. “Scrap rice” refers to low-grade rice (blue rice) that has been distributed in the rice bran-rice selection process, or a powdery portion that is generated after white rice is scraped off in the milling process. The “rice cake” refers to the powder of the rice cake layer and the germ that is produced when the brown rice is polished into white rice, and there are “red rice cake” with a high proportion of rice cake layer and “white rice cake” with a high proportion of white rice.

  Among these, sticky rice is preferable because it contains a lot of proteins, vitamins and minerals on the surface, and promotes the growth of yeast and the rate of ethanol fermentation. In addition, rice husk may be added to rice for the purpose of adding nutritional components contained in the rice to other rice. In addition, the rice used for this embodiment does not require the steaming process for gelatinizing starch, and can be used as it is without steaming.

  The fermentation raw material 12 may be used as it is, but it is preferable to use a pulverized one. By pulverizing the fermentation raw material 12, saccharification can be performed more efficiently than when the pulverization process is not performed. The pretreatment of the fermentation raw material 12 differs depending on the fermentation raw material. For example, starch candy may be used as it is, but for example, it is preferable to use crushed rice, carrot, and pumpkin.

  When rice is used as the fermentation raw material 12, 70% by weight or more of the pulverized rice powder (particles) is less than 5 mm in size from the viewpoint of increasing the efficiency of saccharification. Preferably there is. In particular, it is particularly preferable that 50% by weight or more of the pulverized rice powder (particles) has a particle diameter of less than 1 mm because saccharification is performed more efficiently.

  The particle diameter of the rice powder referred to here is determined by whether or not it passes through a sieve made of a mesh having a predetermined mesh. For example, “particle diameter of less than 5 mm” means that the powder passes through a four-way mesh having an opening of 5 mm. "The particle diameter is less than 1 mm" means a material that passes through a four-sided mesh with an opening of 1 mm. In the present embodiment, it is particularly desirable to grind the rice so that the particle size of the rice powder passes through a four-sided mesh having an opening of 1 mm (that is, particles having a particle size of less than 1 mm) is 50% by weight or more.

  It is preferable that the amount of the fermentation raw material 12 introduced into the fermentation bag 10 is 80% by volume or less of the fermentation bag 10. By setting the amount of the fermentation raw material 12 to be added to the fermentation bag 10 to 80% by volume or less of the fermentation bag 10, the fermentation bag can be fermented by the gas such as carbon dioxide generated during the fermentation without rupture. it can.

  The fermentation raw material 12 is saccharified by adding the enzyme agent 20 and the water 30 while being put in the fermentation bag 10. The enzyme agent 20 can be used without particular limitation as long as it is an amylase-based enzyme, but an enzyme agent containing α-amylase and glucoamylase is preferable because of its excellent saccharification efficiency. As the enzyme agent 20, a commercially available enzyme agent can be used, and examples thereof include Kokugen G20 (α-amylase 1%, glucoamylase 80% and dextrin 19%) manufactured by Daiwa Kasei.

  The addition amount of the enzyme agent 20 can be determined arbitrarily.

  As the water 30, it is preferable to use pure water or ultrapure water such as ion exchange water, ultrafiltration water, reverse osmosis water, or distilled water. In particular, water obtained by sterilizing these waters by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria is prevented.

  The amount of water 30 added is preferably 40 to 60% by weight with respect to the weight of the fermentation raw material 12. By adjusting the amount of water added to 40 to 60% by weight, fermentation with low moisture is possible, so that the treatment of the distillation waste liquid becomes unnecessary.

In the saccharification treatment, koji molds may be added instead of adding the enzyme agent 20. As the koji mold, for example, Aspergillus sojae KBN606 (for soy sauce), Aspergillus sojae KBN615 (for soy sauce), Aspergillus oryzae KBN650 (for soy sauce), Aspergillus oryzae KBN930 (for miso), Aspergillus oryzae KBN943 (for barley miso), Aspergillus 15 oryzae KB (For sake), Aspergillus kawachii KBN2001 (for shochu), Aspergillus kawachii P10-1 (for shochu), Aspergillus awamori KBN2012 (for shochu), Aspergillus saitoi KBN2024 (for Awamori), etc., especially Aspergillus kawachii KBN2001 ( (For shochu), Aspergillus kawachii P10-1, A. oryzae KBN1015, A. oryzae
It is preferable to use KBN943.

  Next, yeast 40 and water 30 as necessary are added, and fermentation mash 14 is prepared. At this time, it is preferable that the fermentation mash 14 is fermented by so-called solid fermentation in which the water content at the start of fermentation is adjusted to 40 to 60% by weight.

  Here, solid fermentation refers to a fermentation method that is performed in a solid state from the start to the end of fermentation using fermentation mash that maintains the minimum amount of water that allows yeast growth and ethanol fermentation.

  In the conventional liquid fermentation method, yeast is added to an aqueous solution containing about 5 to 10% by weight of reducing sugar and cultured, and when ethanol is recovered by distillation after the end of ethanol fermentation, a waste liquid and a fermentation residue are generated. On the other hand, in the solid fermentation method, only the fermentation residue is produced after ethanol is recovered by distillation, so there is no generation of waste liquid, and work and costs for waste liquid treatment become unnecessary. Moreover, since the water content is lower than that of the liquid fermentation method, the generation of malodor is small and the ethanol can be easily recovered.

  In addition, when using rice as the fermentation raw material 12, if the water content at the start of fermentation is less than 40% by weight, almost no ethanol is produced. On the other hand, if the water content exceeds 60% by weight, the waste liquid is recovered after ethanol recovery. Because of this, waste liquid treatment is required. However, the fermentation system and the ethanol production method of the present embodiment can be carried out even when the water content at the start of fermentation exceeds 60% by weight.

  Saccharification and solid fermentation can be carried out separately, but saccharification and fermentation can be carried out simultaneously by the so-called parallel double fermentation method. In such a case, the fermentation raw material 12, the enzyme agent 20, the yeast 40, and the water 30 may be added simultaneously. The saccharification / fermentation conditions can be carried out at 10 to 40 ° C. for 48 to 72 hours.

  The temperature of the solid fermentation can be appropriately set depending on the optimum temperature of the yeast 40, but from the viewpoint of cost, it is preferable to carry out at such a temperature because the temperature of 20 to 25 ° C is economical. When the room temperature is already 20 to 25 ° C., temperature adjustment is not particularly required.

  As the yeast 40, yeast belonging to the genus Saccharomyces cerevisiae, which is generally used for ethanol fermentation, can be used. A part of the moromi after the fermentation can be used as an inoculum (starter) for the next fermentation.

  After completion of the solid fermentation, the fermentation mash 16 after the fermentation is subjected to a distillation process together with the fermentation bag 10. In the distillation step, ethanol (EtOH) is extracted from the fermentation mash 16 after completion of fermentation in the fermentation bag 10. FIG. 2 is a diagram showing an outline of the distillation unit 50 used in the distillation process of the present embodiment.

  The distillation unit 50 includes heating means 52 for heating the fermentation bag 10, air supply means 54 for supplying air B to the fermentation mash 16 after the fermentation in the fermentation bag 10, and air B discharged from the fermentation bag 10. It consists of a cooling trap 56 for capturing with cooling water W.

  The air B is supplied by a pump 58 installed in one of the flow paths, and is configured to circulate between the fermentation bag 10 and the cooling trap 56. Moreover, in order to maintain the airtightness of the flow path, the air hole a is used as an insertion port for inserting the air supply means 54 into the fermentation bag 10. The air hole a may be used as an insertion port for inserting a flow path for discharging to the cooling trap 56.

  The heating means 52 is for heating the fermentation bag 10 and volatilizing ethanol contained in the fermentation mash 16 after completion of the fermentation. If it is in the range of this objective, there will be no limitation in the structure, For example, the heating means 52 can use the bathtub provided with 30-90 degreeC hot water. A heater (not shown) may be attached as appropriate. The reason why the temperature is set to 30 ° C. or higher is that considering the temperature at which ethanol is efficiently volatilized, and that the temperature is 90 ° C. or lower is because the heat resistance of the fermentation bag 10 is considered.

  In addition, when the inside of the fermentation bag 10 becomes a negative pressure during distillation and the flow path on the discharge side is blocked, a carrier (not shown) for improving the air permeability is installed in the fermentation bag 10. It is preferable. Examples of the carrier for improving the air permeability include gold scourer.

  The cooling water W used for the cooling trap 56 preferably has a water temperature of 10 ° C. or lower. The liquefaction efficiency of vaporized ethanol can be improved, so that the water temperature of the cooling water W is low.

  When the fermentation mash 16 after the fermentation is distilled by the distillation unit 50, the ethanol concentration is concentrated to about 60% by weight or more. Thereby, crude distillation ethanol is obtained. Furthermore, you may implement the process of further distilling the obtained crude distillation ethanol, ie, a rectification process, after a distillation process as needed. A general rectification apparatus etc. can be used for a rectification process. In the rectification step, the ethanol concentration is finally concentrated to about 90% by weight or more to obtain rectified ethanol. The obtained ethanol (crude ethanol or rectified ethanol) can be used in various fields such as industrial alcohol and brewing alcohol.

  A distillation residue 18 remains in the contents of the fermentation bag 10 after the distillation process. In the present embodiment, the distillation residue 18 produced as a by-product in the distillation step contains abundant nutrients derived from the fermentation raw material 12 and the yeast 40 and is nutritionally superior. It can be effectively used as livestock feed 19.

  In the case of converting the distillation residue 18 into a livestock feed 19, for example, the distillation residue 18 can be supplied to livestock as it is or after being subjected to a drying treatment. In this embodiment, since the fermentation bag 10 can be used as it is after the distillation step, it can be stored and transported very efficiently and at a low cost.

  In such a case, it is preferable to have a step of degassing the air in the fermentation bag 10 after the distillation step from the viewpoint of improving storage stability and transportability. The deaeration method is not particularly limited, and general deaeration means such as a sealed packaging device can be used. If degassing is performed, the fermentation bag 10 will not be broken immediately even if the remaining yeast undergoes ethanol fermentation and gas is generated. Moreover, if alcohol is contained in the distillation residue 18, since propagation of miscellaneous bacteria can be suppressed, preservability improves.

  The empty bag 10 ′ remaining after the distillation residue 18 is taken out from the fermentation bag 10 can be refilled with the fermentation raw material 12 and used for storage of the raw material, and reused as the fermentation bag 10 used in the saccharification / fermentation and distillation processes. can do. By repeating such a cycle, the running cost can be reduced.

1. Production Method of Ethanol Ethanol was produced according to the following procedure based on the ethanol fermentation system using the fermentation bag shown in FIG.

(1) Fermentation raw material As the fermentation raw material, sprouted potato, carrot, starch cake, and “Iwanan No. 29” which is feed rice cultivated in Oshu City, Iwate Prefecture were used. In the case of feed rice, the rice was pulverized three times using a Town Beaver Mill (registered trademark) biaxial crusher (manufactured by Kayaba Kogyo Co., Ltd.) to prepare a fermentation raw material. In the case of potato and carrot, the fermentation raw material was prepared by crushing twice using a sample crusher manufactured by Nishihara Environmental Technology Co., Ltd.

(2) Fermentation vessel As fermentation vessel, large plastic bag (transparent, 20L capacity, air hole φ50mm), small plastic bag (transparent, 3.79L capacity, air hole φ50mm), aluminum vapor deposited plastic bag (opaque, 3.79L capacity) , Air hole φ30mm), polyethylene garbage collection bag (translucent, approx. 4L capacity, partially using “white translucent garbage collection bag” manufactured by Nippon Sanipack Co., Ltd., no air hole), polyethylene freezing and thawing bag ( Transparent, 196mm x 177mm x 0.068mm, "ZIPLOC Freezer pack for freezing and thawing" (Registered trademark), no air holes), manufactured by Asahi Kasei Home Products Co., Ltd., polyethylene vegetable / fruit pack bag (clear, 280mm x 400mm x 0.20 mm, “Kitchen Stella for Vegetables and Fruit Pack” manufactured by Nippon Sanipack Co., Ltd., without air holes) was used.

  For comparison, a glass bottle with a 500 ml capacity lid and a stainless steel tank device having a saccharification, fermentation and distillation function (vertical semicircular Raschig ring vacuum distillation machine manufactured by Yokoyama Engineering Co., Ltd., effective capacity of about 40 L) are also available. It carried out similarly.

(3) Test enzyme agent As enzyme agents, Kokugen G20 (α-amylase 1%, glucoamylase 80%, dextrin 19%) manufactured by Daiwa Kasei Co., Ltd., and acremonium cellulase (manufactured by Meiji Seika Co., Ltd.) were added in appropriate amounts. .

(4) Test yeast The yeast used was shochu yeast A30 Saccharomyces cerevisiae, which was a gift from the Department of Brewing Microbiology, Tokyo University of Agriculture. 10 ml of YM medium consisting of 0.5% by weight of polypeptone, 0.3% by weight of yeast extract, 2.0% by weight of glucose and 0.3% by weight of maltose was dispensed into an L-shaped tube, and autoclaved (1.2 atm, 121 (20 ° C., 20 min), 1 platinum ear of the shochu yeast was aseptically inoculated and shake-cultured (25 ° C., 48 hours) was used as the preculture yeast.

(5) Saccharification and solid fermentation The fermentation raw material that has been pretreated as described above is placed in a fermentation vessel in an amount such that the ratio of the fermentation raw material / container is 80% or less, and the moisture content of the fermentation mash is about 60% by weight. Water was added so that However, when the water content of the fermentation raw material was 60% by weight or more, no water adjustment was performed. Next, precultured yeast and Kokugen G20 and / or Acremonium cellulase are added to the fermentation vessel, and saccharification and solid fermentation (parallel duplex fermentation) are performed at room temperature (20-30 ° C.) or 25 ° C. for 2 to 3 days. went. In addition, since gas, such as a carbon dioxide which generate | occur | produced during solid-state fermentation, was made to discharge | release from the air hole previously formed in the fermentation bag, the fermentation bag was able to implement fermentation without bursting.

(6) Distillation After completion of the solid fermentation, the example using the fermentation bag was distilled using the distillation unit shown in FIG. That is, a fermentation bag was installed in a 50 ° C. thermostat, an air stone was inserted into the fermentation cake, the temperature of the cooling water in the cooling trap was 0 ° C., and the fermentation bag was connected to the cooling trap with a rubber tube and a pump. Then, the pump was turned on, and distillation was performed for about 2 hours while refluxing between the fermentation bag and the cooling trap.

In addition, about the example which used the glass bottle as a fermentation container, it distilled by the rotary evaporator made from GL Sciences, and used the stainless steel tank apparatus (the vertical semicircle Raschig ring type vacuum distillation machine made from Yokoyama Engineering). For the examples, distillation was performed using the distillation function provided in the apparatus.

(7) Feeding After the distillation, the air stone and rubber tube were removed from the fermentation bag, and the inside of the fermentation bag was deaerated with a pump. And a part was preserve | saved and a part was used as livestock feed. When this livestock feed was fed to chickens in a poultry farm, either a feed mixed with corn as the main ingredient was added as a high protein additive, or a livestock feed was fed as a high protein feed. In this case, good biting was confirmed.

  In addition, it confirmed that the used fermentation bag had the intensity | strength which can be fully used as a fermentation bag for the next ethanol manufacture.

2. Test result (1) Composition composition of fermentation raw material The total sugar amount of the fermentation raw material rice was measured by the phenol-sulfuric acid method. Moreover, when the moisture content was measured with the drying method, the moisture content was 12 weight%.

(2) Measurement of ethanol production Fermentation mash after solid fermentation was collected, and the ethanol concentration was measured using an alcohol concentration meter (YSA-Kiki Co., Ltd. YSA-200 type). The results are shown in Table 2.

  From the results in Table 2, even when a plastic bag was used for the fermenter, ethanol having an ethanol concentration comparable to that obtained when a conventional stainless steel tank device and glass bottle were used was produced. In addition, as shown in Table 2, the ethanol yield, which indicates the amount of ethanol produced per raw material, showed a ratio that was almost the same as that of the conventional method.

DESCRIPTION OF SYMBOLS 10 ... Fermentation bag 12 ... Fermentation raw material 14 ... Fermentation mash 16 ... Fermentation mash 18 after fermentation end ... Distillation residue 19 ... Feed 20 ... Enzyme agent 30 ... Water 40 ... Yeast 50 ... Distillation unit 52 ... Heating means 54 ... Air supply means 56 ... Cooling trap 58 ... Pump

Claims (11)

A fermentation bag comprising a water-resistant and flexible plastic bag, containing fermentation raw materials, and performing saccharification and ethanol fermentation;
It consists of a heating means for heating the fermentation bag, an air supply means for supplying air to the fermentation mash in the fermentation bag, and a cooling trap for capturing the air discharged from the fermentation bag with cooling water. A distillation unit for extracting ethanol from fermented moromi,
A fermentation system using a fermentation bag.   The fermentation system using the fermentation bag according to claim 1, wherein the fermentation bag includes an air hole for discharging gas generated during fermentation to the outside of the fermentation bag.   The fermentation system using the fermentation bag according to claim 1 or 2, wherein the fermentation bag is formed of a material capable of visually checking the contents.   The fermentation system using the fermentation bag of any one of Claims 1-3 whose said heating means is a bathtub provided with 30-90 degreeC warm water. A fermentation process in which fermentation raw materials are introduced into a fermentation bag made of a plastic bag having water resistance and flexibility, and saccharification and ethanol fermentation are performed in the fermentation bag;
After the fermentation is completed, the distillation step of distilling ethanol from the fermentation cake in the fermentation bag by supplying air to the fermentation bag while heating the fermentation bag and capturing the air discharged from the fermentation bag with cooling water;
A method for producing ethanol using a fermentation bag.   The said ethanol fermentation is the ethanol manufacturing method using the fermentation bag of Claim 5 which is solid state fermentation performed by the water | moisture content of 40-60 weight% at the time of fermentation start.   The said ethanol fermentation is the ethanol manufacturing method using the fermentation bag of Claim 5 or 6 which has the process of discharging | emitting the gas produced at the time of fermentation outside a fermentation bag.   The said fermentation bag is an ethanol manufacturing method using the fermentation bag of any one of Claims 5-7 using the raw material which can visually recognize the contents.   The ethanol production method using the fermentation bag according to any one of claims 5 to 8, wherein the fermentation bag is heated at 30 to 90 ° C.   The ethanol production method using the fermentation bag according to any one of claims 5 to 9, wherein an amount of the fermentation raw material to be introduced into the fermentation bag is 80% by volume or less of the fermentation bag.   Furthermore, the ethanol manufacturing method using the fermentation bag of any one of Claims 5-10 which has the process of deaerating the air in the said fermentation bag after the said distillation process.