JP4543504B2 - Dry methane fermentation method for organic waste - Google Patents

Dry methane fermentation method for organic waste Download PDF

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Publication number
JP4543504B2
JP4543504B2 JP2000170827A JP2000170827A JP4543504B2 JP 4543504 B2 JP4543504 B2 JP 4543504B2 JP 2000170827 A JP2000170827 A JP 2000170827A JP 2000170827 A JP2000170827 A JP 2000170827A JP 4543504 B2 JP4543504 B2 JP 4543504B2
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methane fermentation
organic waste
concentration
ratio
dry methane
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JP2001347247A (en
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光昭 黒島
重希 堀井
哲雄 古賀
保 石橋
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Kurita Water Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/20—Waste processing or separation

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  • Treatment Of Sludge (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、畜産業、食品産業、製紙業等より発生する有機性廃棄物の乾式メタン発酵方法に係り、特に、これらの有機性廃棄物を高負荷で効率的に乾式メタン発酵処理してメタンガスとして再資源化すると共に、古紙や雑草等の乾式メタン発酵をも行える有機性廃棄物の乾式メタン発酵方法に関する。
【０００２】
【従来の技術】
古紙、生ごみ、家畜糞尿などの有機性廃棄物をメタン発酵菌の作用で嫌気性分解するメタン発酵処理は、廃棄物を大幅に減容化すると共に、分解により得られるメタンガスを含むバイオガスを電気又は熱の形でエネルギー回収することができるという優れた利点を有する処理方法である。
【０００３】
このメタン発酵法には、ＴＳ（全固形物）濃度３〜５％程度でメタン発酵する湿式メタン発酵法と、ＴＳ濃度１５〜４０％程度でメタン発酵する乾式メタン発酵法とがある。
【０００４】
このうち、湿式メタン発酵法では、ＴＳ濃度が低いため、高負荷処理が困難であり、また、生ゴミや糞尿、古紙、下水汚泥等のＴＳ濃度の高い有機物を処理するためには前処理工程として可溶化処理や希釈によってＴＳ濃度を１０％以下にする必要があった。
【０００５】
これに対して、乾式メタン発酵法であれば、ＴＳ濃度の高い有機性廃棄物を複雑な前処理工程なしに高負荷で処理してバイオガスを得ることができる。
【０００６】
【発明が解決しようとする課題】
しかしながら、乾式メタン発酵法では、ＴＳ濃度の高い有機性廃棄物を高負荷で処理するため、被処理物によっては窒素含有濃度が高くアンモニアが高濃度に発生して、メタン発酵菌の生育が阻害され、メタン発酵効率が低下したり、炭素源が少なく、メタン発酵の基質が不足してメタン発酵が進行せず、メタンガスを安定かつ効率的に回収することができないという不具合があった。
【０００７】
本発明は上記従来の問題点を解決し、古紙、生ごみ、家畜糞尿、し尿、汚泥等の有機性廃棄物を乾式メタン発酵により高いメタン発酵効率にて高負荷処理することにより、メタンガスを安定かつ効率的に回収することができる有機性廃棄物の乾式メタン発酵方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明の有機性廃棄物の乾式メタン発酵方法は、有機性廃棄物をＴＳ（全固形物）濃度２０〜４０％で乾式メタン発酵処理する方法において、該有機性廃棄物のＣ／Ｎ比が２５〜２５０となるように該有機性廃棄物を調整することを特徴とする。
【０００９】
Ｃ／Ｎ比が２５〜２５０となるように有機性廃棄物を調整することにより、効率的な乾式メタン発酵処理を行うことができる。
【００１０】
上記Ｃ／Ｎ比に調整するためには、繊維含有有機物を有機性廃棄物に添加するのが好ましく、特に、繊維含有有機物として紙（古紙）及び／又は草（雑草）を添加することにより、従来のメタン発酵では前処理が必要とされたこれらの廃棄物を前処理なしでメタン発酵処理することが可能となる。
【００１１】
【発明の実施の形態】
以下に本発明の有機性廃棄物の乾式メタン発酵方法の実施の形態を図面を参照しながら詳細に説明する。
【００１２】
図１は本発明の有機性廃棄物の乾式メタン発酵方法の実施の形態を示す系統図である。
【００１３】
生ゴミ、家畜糞尿、下水処理場等から発生する汚泥などの有機性廃棄物を、要すれば破砕機等を用い直径５〜４ｃｍ或いはそれ以下に破砕した投入原料１を混合装置２に投入し、必要に応じて水や繊維含有有機物３を添加混合し、混合発酵原料を得、これを乾式メタン発酵槽６からの返送汚泥９と混合した混合物５を乾式メタン発酵槽６に送給する。
【００１４】
本発明においては、この混合発酵原料のＣ／Ｎ比が２５〜２５０、好ましくは２５〜６０となるように調整する。また、混合発酵原料のＴＳ濃度は２０〜４０％、好ましくは２０〜３５％とする。
【００１５】
Ｃ／Ｎ比が２０未満ではメタン発酵の基質である炭素源が不足し、２５０を超えるような炭素過剰のものでは、別途窒素やリンを添加しなければ微生物による分解が困難である。特に、Ｃ／Ｎ比が６０を超えると有機態炭素を資化する増殖速度の大きい酸生成菌がメタン発酵菌に優先してメタン発酵菌の生育が阻害されるため、Ｃ／Ｎ比は６０以下、特に２５〜６０とするのが好ましい。
【００１６】
また、ＴＳ濃度が２０％未満では乾式メタン発酵による高負荷処理ができず、４０％を超えると水分量が不足していずれの場合もメタン発酵効率が低下する場合がある。
【００１７】
投入原料１は通常、下水汚泥や糞尿のように窒素過多なものであるため、混合装置２においてＣ／Ｎ比を調整する。Ｃ／Ｎ比の調整手段としては、投入原料１を加熱脱水し、脱アンモニア処理してＣ／Ｎ比を高くすることにより混合発酵原料のＣ／Ｎ比及びＴＳ濃度を調整することができる。しかし、このような投入原料の前処理を行うと処理操作が複雑化し、また脱水濾液の処理も必要になるので好ましくなく、混合装置２に紙や藁、雑草などＣ／Ｎ比、ＴＳ濃度の両方が高い繊維含有有機物３もあわせて投入し、投入原料１と混合することにより混合発酵原料のＣ／Ｎ比を上記範囲に調整することができると共に、ＴＳ濃度も調整できる。
【００１８】
一般に、汚泥や家畜糞尿等の有機性廃棄物は、上記ＴＳ濃度に対して若干固形物量が不足し、またＣ／Ｎが低い。これに対して紙（古紙）や草（雑草）は繊維を多く含む有機物であり、しかもＣ／Ｎ比が高い。紙はＮを殆ど含まず従って、Ｃ／Ｎは著しく高く、草はＣ／Ｎが６０〜１００程度である。従って、ＴＳ濃度やＣ／Ｎ比の調整剤として適している。しかも、紙や草はセルロースなどの生物分解性の炭素源とリグニン、ヘミセルロース、灰分などの難分解性物質も含むため、これらを添加することにより、生物分解性物質が微生物の基質となり、また、難分解性物質が微生物担体として作用することで良好な乾式メタン発酵処理を行える。
【００１９】
混合装置２には蒸気４の吹き込みを行って混合発酵原料と返送汚泥９との混合物５を５０〜６０℃に加温し、これを乾式メタン発酵槽６に投入し、嫌気条件下で乾式メタンを発酵させる。混合発酵原料はメタン生成菌を含む返送汚泥９と混合され、加温されているため、発酵槽６内の加温、攪拌操作は不要である。このため、発酵槽６内にはＴＳ濃度１５〜４０％の高濃度の汚泥が保持され、１０〜２０ｋｇ−ＣＯＤＣＣｒ／ｍ３／ｄａｙの高負荷で乾式メタン発酵が行われる。
【００２０】
発酵槽６に投入された混合発酵原料は発酵槽６内で嫌気性微生物により分解されて徐々にＴＳ濃度が低下し、発酵槽６の下部へ移動し、引抜き汚泥７として引き抜かれる。１日当りの汚泥７の引き抜き量は槽内に保有される汚泥の１／４〜１倍、好ましくは１／３〜１／２倍で、このうち混合発酵原料からガス化した部分を除いた量（通常は混合発酵原料の９０％程度）を余剰汚泥８として排出し、残りは返送汚泥９として混合装置２に供給し、混合発酵原料と混合する。
【００２１】
このような本発明の方法によれば、畜産業、食品産業、製紙業等から排出される有機性廃棄物や、生ごみ等を効率的に処理してメタンガスとして再資源化することが可能となる。
【００２２】
【実施例】
以下に実施例及び比較例を挙げて本発明をより具体的に説明する。
【００２３】
試験１（実施例１）
図１に示す装置を用いてＴＳ濃度２０％、Ｃ／Ｎ比１３の豚糞と生ゴミの混合物（生ゴミは直径５ｃｍに破砕）の処理を行った。混合装置２において豚糞と生ゴミの混合物及び繊維含有有機物３として幅５ｍｍ程度に裁断した古紙を表１に示す割合で混合し、混合発酵原料のＴＳ濃度及びＣ／Ｎ比を表１に示す値に調整した。これを３１ｋｇ−混合発酵原料／ｔ−返送汚泥となるように返送汚泥９と混合し、蒸気の吹き込みにより５５℃に加温し、乾式メタン発酵槽６に投入し、下記条件で３２日間連続して乾式メタン発酵槽処理し、このときのメタンガス発生量を調べた。表１に試験期間中のメタンガス発生量の平均値を示す。なお、発酵槽６内の温度は試験期間中、５２〜５５℃であった。
［処理条件］
発酵槽内汚泥量；約２１ｔ
投入原料 ；約６００ｋｇ／ｄａｙ
余剰汚泥量 ；約５５０ｋｇ／ｄａｙ
返送汚泥量 ；約２１ｔ／ｄａｙ
【００２４】
試験２（実施例２〜４、比較例１）
投入原料１をＴＳ濃度２６％、Ｃ／Ｎ比１２の豚糞とし、試験１で用いた装置より規模が小さい試験装置を用い、下記に示す条件で３０日間の連続処理を行った。投入原料と実験装置の大きさ及び試験期間以外は実施例１と同様とした。このときの古紙の添加量、混合発酵原料のＴＳ濃度、Ｃ／Ｎ比、メタンガス発生量の平均値を表１に示す。
［処理条件］
発酵槽内汚泥量；約３．５ｋｇ
投入原料 ；約１１０ｇ／ｄａｙ
余剰汚泥量 ；約１００ｇ／ｄａｙ
返送汚泥量 ；約３．５ｋｇ／ｄａｙ
【００２５】
試験３（実施例５、比較例２）
投入原料１として２種類の古紙を用い、混合装置２において、ＴＳ濃度を調整したものを混合発酵原料とした他は試験２と同様の処理を行った。このときの混合発酵原料のＴＳ濃度、Ｃ／Ｎ比、メタンガス発生量の平均値を表１に示す。
【００２６】
【表１】

Figure 0004543504
【００２７】
表１より、被処理物のＣ／Ｎ比を２５〜２５０、好ましくは２５〜６０とすることにより、効率的なメタン発酵処理を行えることがわかる。
【００２８】
【発明の効果】
以上詳述した通り、本発明の有機性廃棄物の乾式メタン発酵方法によれば、生ごみ、家畜糞尿等の有機性廃棄物、更には古紙、雑草等を乾式メタン発酵により高いメタン発酵効率にて高負荷処理することにより、メタンガスを安定かつ効率的に回収することが可能とされる。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す系統図である。
【符号の説明】
１ 投入原料
２ 混合装置
３ 繊維含有有機物
４ 蒸気
６ 乾式メタン発酵槽
７ 引抜汚泥
８ 余剰汚泥
９ 返送汚泥[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry methane fermentation method for organic waste generated from the livestock industry, food industry, paper industry, etc., and in particular, these organic wastes are efficiently subjected to dry methane fermentation treatment with high load to produce methane gas. It is related with the dry methane fermentation method of the organic waste which can also carry out dry methane fermentation of waste paper, weeds, etc.
[0002]
[Prior art]
The methane fermentation process that anaerobically decomposes organic waste such as waste paper, food waste, and livestock manure by the action of methane fermentation bacteria greatly reduces the volume of waste, and biogas containing methane gas obtained by the decomposition. It is a processing method having an excellent advantage that energy can be recovered in the form of electricity or heat.
[0003]
This methane fermentation method includes a wet methane fermentation method in which methane fermentation is performed at a TS (total solids) concentration of about 3 to 5%, and a dry methane fermentation method in which methane fermentation is performed at a TS concentration of about 15 to 40%.
[0004]
Among these, the wet methane fermentation method has a low TS concentration, so it is difficult to carry out a high load treatment, and a pretreatment step is required to treat organic matter with a high TS concentration such as raw garbage, manure, waste paper, and sewage sludge. As a result, it was necessary to reduce the TS concentration to 10% or less by solubilization or dilution.
[0005]
On the other hand, if it is a dry-type methane fermentation method, a biogas can be obtained by processing an organic waste with a high TS concentration at a high load without a complicated pretreatment process.
[0006]
[Problems to be solved by the invention]
However, in the dry methane fermentation method, organic waste with a high TS concentration is treated with a high load, so depending on the material to be treated, the nitrogen content is high and ammonia is generated at a high concentration, which inhibits the growth of methane fermentation bacteria. However, the methane fermentation efficiency is reduced, the carbon source is low, the substrate for methane fermentation is insufficient, methane fermentation does not proceed, and methane gas cannot be recovered stably and efficiently.
[0007]
The present invention solves the above-mentioned conventional problems and stabilizes methane gas by treating organic waste such as waste paper, garbage, livestock manure, human waste, sludge, etc. with high methane fermentation efficiency by dry methane fermentation. An object of the present invention is to provide a method for dry methane fermentation of organic waste that can be recovered efficiently.
[0008]
[Means for Solving the Problems]
The method of dry methane fermentation of organic waste according to the present invention is a method of subjecting organic waste to dry methane fermentation at a TS (total solids) concentration of 20 to 40%, wherein the C / N ratio of the organic waste is The organic waste is adjusted to be 25 to 250.
[0009]
By adjusting the organic waste so that the C / N ratio is 25 to 250, an efficient dry methane fermentation treatment can be performed.
[0010]
In order to adjust to the C / N ratio, it is preferable to add fiber-containing organic matter to organic waste, and in particular, by adding paper (waste paper) and / or grass (weed) as fiber-containing organic matter, It becomes possible to perform methane fermentation treatment of these wastes, which require pretreatment in conventional methane fermentation, without pretreatment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the organic waste dry methane fermentation method of the present invention will be described below in detail with reference to the drawings.
[0012]
FIG. 1 is a system diagram showing an embodiment of the organic waste dry methane fermentation method of the present invention.
[0013]
Feeding raw material 1 that has been crushed into organic waste such as raw garbage, livestock manure, sludge, etc. from sewage treatment plant, if necessary, using a crusher etc. If necessary, water and fiber-containing organic matter 3 are added and mixed to obtain a mixed fermentation raw material, and the mixture 5 mixed with the return sludge 9 from the dry methane fermentation tank 6 is fed to the dry methane fermentation tank 6.
[0014]
In the present invention, C / N ratio of the mixed fermentation material is 25 to 250, preferably adjusted to be 25 to 60. Also, TS concentration in the mixed fermentation material 20-40% preferably you 20 to 35%.
[0015]
When the C / N ratio is less than 20, the carbon source that is a substrate for methane fermentation is insufficient, and when the carbon excess exceeds 250, decomposition by microorganisms is difficult unless nitrogen or phosphorus is added separately. In particular, when the C / N ratio exceeds 60, acid-producing bacteria having a high growth rate that assimilate organic carbon are preferentially inhibited from growth of methane-fermenting bacteria. Therefore, the C / N ratio is 60 Hereinafter, it is particularly preferably 25 to 60.
[0016]
Moreover, if the TS concentration is less than 20%, high-load treatment by dry methane fermentation cannot be performed, and if it exceeds 40%, the amount of water is insufficient and the methane fermentation efficiency may be reduced in any case.
[0017]
Since the input raw material 1 is usually rich in nitrogen such as sewage sludge and manure, the mixing device 2 adjusts the C / N ratio. As a means for adjusting the C / N ratio, the C / N ratio and the TS concentration of the mixed fermentation raw material can be adjusted by heating and dehydrating the input raw material 1 and deammonia treatment to increase the C / N ratio. However, such a pretreatment of the input material is not preferable because the processing operation becomes complicated and the treatment of the dehydrated filtrate is also required, and the mixing device 2 has a C / N ratio such as paper, straw, and weed, and TS concentration. By adding together the fiber-containing organic material 3 that is both high and mixing with the input raw material 1, the C / N ratio of the mixed fermentation raw material can be adjusted to the above range, and the TS concentration can also be adjusted.
[0018]
In general, organic wastes such as sludge and livestock manure are slightly deficient in solids and have a low C / N ratio with respect to the TS concentration. On the other hand, paper (waste paper) and grass (weeds) are organic substances containing a lot of fibers and have a high C / N ratio. The paper contains almost no N, so the C / N is remarkably high and the grass has a C / N of about 60-100. Therefore, it is suitable as a regulator of TS concentration and C / N ratio. Moreover, since paper and grass also contain biodegradable carbon sources such as cellulose and refractory substances such as lignin, hemicellulose, and ash, by adding these, the biodegradable substance becomes a microbial substrate, A good dry methane fermentation process can be performed because a hardly decomposable substance acts as a microorganism carrier.
[0019]
Steam 4 is blown into the mixing device 2 to heat the mixture 5 of the mixed fermentation raw material and the return sludge 9 to 50-60 ° C., and this is put into the dry methane fermentation tank 6, and dry methane under anaerobic conditions. Ferment. Since the mixed fermentation raw material is mixed with the return sludge 9 containing methanogen and heated, the heating and stirring operations in the fermenter 6 are not required. For this reason, high concentration sludge with a TS concentration of 15 to 40% is retained in the fermenter 6, and dry methane fermentation is performed with a high load of 10 to 20 kg-CODC Cr / m 3 / day.
[0020]
The mixed fermented raw material charged into the fermenter 6 is decomposed by anaerobic microorganisms in the fermenter 6 and gradually decreases in TS concentration, moves to the lower part of the fermenter 6, and is extracted as drawn sludge 7. The extraction amount of sludge 7 per day is 1/4 to 1 times, preferably 1/3 to 1/2 times the sludge retained in the tank, and the amount excluding the gasified portion from the mixed fermentation raw material (Normally, about 90% of the mixed fermentation raw material) is discharged as surplus sludge 8, and the remainder is supplied as return sludge 9 to the mixing device 2 and mixed with the mixed fermentation raw material.
[0021]
According to such a method of the present invention, it is possible to efficiently treat organic waste discharged from the livestock industry, food industry, paper industry, etc., garbage, etc., and recycle it as methane gas. Become.
[0022]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
[0023]
Test 1 (Example 1)
Using the apparatus shown in FIG. 1, a mixture of pig feces and garbage having a TS concentration of 20% and a C / N ratio of 13 (food garbage was crushed to a diameter of 5 cm) was performed. In the mixing device 2, waste paper cut into a width of about 5 mm as a mixture of pig excrement and raw garbage and fiber-containing organic matter 3 is mixed at a ratio shown in Table 1, and the TS concentration and C / N ratio of the mixed fermentation raw material are shown in Table 1. Adjusted to value. This is mixed with return sludge 9 so that it becomes 31 kg-mixed fermentation raw material / t-return sludge, heated to 55 ° C. by blowing steam, put into the dry methane fermentation tank 6, and continuously for 32 days under the following conditions. The methane gas generation amount at this time was investigated. Table 1 shows the average value of methane gas generation during the test period. In addition, the temperature in the fermenter 6 was 52-55 degreeC during the test period.
[Processing conditions]
Amount of sludge in the fermenter; approx. 21t
Input material: approx. 600 kg / day
Excess sludge amount: about 550kg / day
Return sludge volume: approx. 21t / day
[0024]
Test 2 (Examples 2 to 4, Comparative Example 1)
The input raw material 1 was pig feces having a TS concentration of 26% and a C / N ratio of 12, and a test apparatus having a smaller scale than the apparatus used in the test 1 was used, and continuous treatment was performed for 30 days under the following conditions. Example 1 was the same as in Example 1 except for the input materials, the size of the experimental apparatus, and the test period. Table 1 shows the amount of waste paper added, the TS concentration of the mixed fermentation material, the C / N ratio, and the average value of the amount of methane gas generated.
[Processing conditions]
Amount of sludge in the fermenter; about 3.5 kg
Input material: about 110 g / day
Excess sludge amount: approx. 100 g / day
Return sludge amount: about 3.5kg / day
[0025]
Test 3 (Example 5, Comparative Example 2)
The same treatment as in Test 2 was performed, except that two types of used paper were used as the input raw material 1 and the mixed apparatus 2 used a mixed fermentation raw material with a TS concentration adjusted. Table 1 shows the TS concentration, the C / N ratio, and the average value of the amount of methane gas generated at this time.
[0026]
[Table 1]
Figure 0004543504
[0027]
From Table 1, it is understood that an efficient methane fermentation treatment can be performed by setting the C / N ratio of the object to be treated to 25 to 250, preferably 25 to 60.
[0028]
【The invention's effect】
As described in detail above, according to the dry methane fermentation method for organic waste of the present invention, organic waste such as garbage, livestock manure, etc., as well as waste paper, weeds, etc., have high methane fermentation efficiency by dry methane fermentation. By carrying out high load processing, methane gas can be recovered stably and efficiently.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input raw material 2 Mixing device 3 Fiber-containing organic substance 4 Steam 6 Dry-type methane fermentation tank 7 Extraction sludge 8 Surplus sludge 9 Return sludge

Claims (3)

有機性廃棄物をＴＳ（全固形物）濃度２０〜４０％で乾式メタン発酵処理する方法において、該有機性廃棄物のＣ／Ｎ比が２５〜２５０となるように該有機性廃棄物を調整することを特徴とする有機性廃棄物の乾式メタン発酵方法。In the method of subjecting organic waste to dry methane fermentation at a TS (total solids) concentration of 20 to 40% , the organic waste is adjusted so that the C / N ratio of the organic waste is 25 to 250 A dry methane fermentation method for organic waste, characterized in that: 請求項１において、該有機性廃棄物に繊維含有有機物を添加することにより、該有機性廃棄物を調整することを特徴とする有機性廃棄物の乾式メタン発酵方法。The method for dry methane fermentation of organic waste according to claim 1, wherein the organic waste is adjusted by adding a fiber-containing organic matter to the organic waste. 請求項２において、繊維含有有機物が紙及び／又は草であることを特徴とする有機性廃棄物の乾式メタン発酵方法。3. The dry methane fermentation method for organic waste according to claim 2, wherein the fiber-containing organic material is paper and / or grass.
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