JPH0738994B2 - Initial operation method of low temperature methane fermentation - Google Patents
Initial operation method of low temperature methane fermentationInfo
- Publication number
- JPH0738994B2 JPH0738994B2 JP8631187A JP8631187A JPH0738994B2 JP H0738994 B2 JPH0738994 B2 JP H0738994B2 JP 8631187 A JP8631187 A JP 8631187A JP 8631187 A JP8631187 A JP 8631187A JP H0738994 B2 JPH0738994 B2 JP H0738994B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- methane
- fermentation
- bacteria
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 106
- 238000000855 fermentation Methods 0.000 title claims description 44
- 230000004151 fermentation Effects 0.000 title claims description 44
- 238000000034 method Methods 0.000 title claims description 12
- 241000894006 Bacteria Species 0.000 claims description 51
- 239000000758 substrate Substances 0.000 claims description 35
- 239000010802 sludge Substances 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 11
- 230000004913 activation Effects 0.000 claims description 4
- 238000002309 gasification Methods 0.000 description 13
- 230000003301 hydrolyzing effect Effects 0.000 description 13
- 210000003608 fece Anatomy 0.000 description 11
- 241000282898 Sus scrofa Species 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- 230000007062 hydrolysis Effects 0.000 description 9
- 238000006460 hydrolysis reaction Methods 0.000 description 9
- 150000007524 organic acids Chemical class 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 4
- 239000002054 inoculum Substances 0.000 description 4
- 239000013067 intermediate product Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000010871 livestock manure Substances 0.000 description 3
- 235000005985 organic acids Nutrition 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000010801 sewage sludge Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000035473 Communicable disease Diseases 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Treatment Of Biological Wastes In General (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】 A.産業上の利用分野 本発明は、低温メタン菌を利用した低温メタン発酵の初
期運転の方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method of initial operation of low temperature methane fermentation using low temperature methane bacteria.
B.発明の概要 本発明は、例えば自然界から採取した低温菌を用いて家
畜糞等の発酵原料を低温メタン発酵する場合の初期運転
方法において、 発酵原料を、中温メタン発酵消化汚泥を収容した第１の
槽と低温菌を収容した第２の槽とを順次に通すと共に、
第２の槽よりの消化汚泥を第１の槽に返送して、双方の
槽に基質に適応した加水分解菌と低温メタン菌とを併存
させることにより、 低温メタン発酵の定常運転に至るまでの立上がり期間が
早くなるようにしたものである。B. Outline of the Invention The present invention is, for example, in the initial operation method in the case of performing low-temperature methane fermentation of a fermentation raw material such as livestock manure using a low temperature bacterium collected from the natural world. While sequentially passing the first tank and the second tank containing the psychrophilic bacteria,
By returning the digested sludge from the 2nd tank to the 1st tank and making both tanks coexist with the hydrolyzing bacteria adapted to the substrate and the low temperature methane bacteria, the steady operation of low temperature methane fermentation is achieved. It is designed so that the rising period is shortened.
C.従来の技術 メタン発酵技術は、有機系廃棄物からのエネルギー回収
効果と環境衛生における処理効果という両面からその有
効性が再認識されてきている。メタン発酵は、嫌気的条
件で多種類の細菌が関与して２段階で進行する生物反応
である。この生物反応は、有機物を加水分解菌により加
水分解させて中間生成物に分解し、更にその中間生成物
をメタン菌によりガス化して最終生成物に分解すること
により進行する。ここに中間生成物とは有機酸、アルコ
ール、二酸化炭素、水素であり、これらら中間生成物が
分解し、或いは互いに反応して最終生成物であるメタ
ン、二酸化炭素、及び硫化水素が得られる。C. Conventional technology Methane fermentation technology has been re-recognized as its effectiveness in terms of both energy recovery effect from organic waste and treatment effect in environmental hygiene. Methane fermentation is a biological reaction that progresses in two stages in which a large variety of bacteria are involved under anaerobic conditions. This biological reaction proceeds by hydrolyzing an organic substance with a hydrolyzing bacterium to decompose it into an intermediate product, and further gasifying the intermediate product with a methane bacterium to decompose it into a final product. Here, the intermediate products are organic acids, alcohols, carbon dioxide, and hydrogen, and these intermediate products decompose or react with each other to obtain methane, carbon dioxide, and hydrogen sulfide as final products.
ところでメタン発酵法としては、加温にそれ程大きなエ
ネルギーを必要としないこと及びメタン菌を容易に入手
できることから、従来より中温メタン菌を用いた中温メ
タン発酵が主流を占めている。しかしながら中温メタン
発酵は、寒冷期には加温エネルギーが大きくなって補助
燃料を必要とする場合もあること等からエネルギー回収
システムとしての評価がそれ程高くない。By the way, as a methane fermentation method, mesophilic methane fermentation using mesophilic methane bacteria has been dominated in the past since it does not require so much energy for heating and methane bacteria can be easily obtained. However, medium-temperature methane fermentation is not so highly evaluated as an energy recovery system because heating energy may become large in the cold season and auxiliary fuel may be required.
こうした実情から自然界からのスクリーニングにより30
℃以下の低温においてもガス化活性の高いメタン菌を得
る研究がなされている。このような低温メタン菌は高い
エネルギー回収効率が得られることから有効なものであ
るが、現状では希少であるためタンク内で優先種とする
ための方法を開発する必要がある。Based on this situation, screening from the natural world 30
Studies have been conducted to obtain methane bacteria with high gasification activity even at low temperatures of ℃ or below. Such a low temperature methane bacterium is effective because it can obtain a high energy recovery efficiency, but at present it is rare and it is necessary to develop a method for making it a priority species in the tank.
D.発明が解決しようとする問題点 ところで自然界より採取した低温菌は有機酸あるいは同
種基質に対するガス化能力は高いものの、異種基質に対
しては、低温下にて高いガス化能力を発揮するまでに長
時間を要する。これは炭水化物，脂肪，蛋白質などの複
雑な有機物から有機酸への加水分解を行う加水分解菌群
の構成が基質の変化に適応するのに時間がかかり、特に
低温下ではその傾が顕著になるためであると考えられ
る。従って低温メタン発酵を実用化するためには種菌の
異種基質に対する馴養の期間を短縮することが特に重要
である。しかしながら種菌の異種基質に対する馴養方法
については、現場の技術者の経験に頼っており、定型的
な方法はないのが実状である。こうしたことから現状で
は低温メタン発酵の実用化が十分図られていない。D. Problems to be Solved by the Invention By the way, although the psychrophilic bacteria collected from nature have a high gasification capacity for organic acids or the same kind of substrates, they have a high gasification capacity for different kinds of substrates at a low temperature. Takes a long time. It takes time for the composition of hydrolyzing bacteria that hydrolyzes complex organic substances such as carbohydrates, fats, and proteins to organic acids to adapt to changes in the substrate, and this tendency becomes remarkable especially at low temperatures. It is thought to be because of this. Therefore, in order to put the low temperature methane fermentation into practical use, it is particularly important to shorten the period of acclimatization of the inoculum to the heterogeneous substrate. However, the method of acclimatizing the inoculum to the heterogeneous substrate depends on the experience of engineers in the field, and there is no standard method. For these reasons, at present, low-temperature methane fermentation has not been sufficiently put into practical use.
本発明の目的は、例えば自然界より採取した低温菌を用
いて立上がりの早い即ち高い能力を発揮する状態に至る
までの時間を短縮することのでる低温メタン発酵の初期
運転方法に関するものである。The object of the present invention relates to an initial operation method of low-temperature methane fermentation, which can shorten the time required to reach a state in which it rapidly rises, that is, exhibits a high capacity, by using a low-temperature bacterium collected from nature.
E.問題点を解決するための手段 本発明は、発酵原料の基質と類似または同種の基質を用
いて中温メタン発酵を行うことにより得られた中温メタ
ン発酵消化汚泥を第１の槽に収容すると共に低温メタン
菌を含む低温菌を第２の槽に収容して、これら第１の槽
及び第２の槽を低温メタン菌の活性化温度範囲内に保温
し、 発酵原料を前記第１の槽内にて前記消化汚泥の加水分解
菌群により加水分解し、次いで前記第２の槽に導入して
低温メタン菌群によりガス化し、次に前記第２の槽より
の消化汚泥を、汚泥濃度を高める処理をした後前記第１
の槽に返送することを特徴とする。E. Means for Solving Problems The present invention accommodates, in a first tank, a mesophilic methane fermentation digested sludge obtained by carrying out mesophilic methane fermentation using a substrate similar to or similar to a substrate of a fermentation raw material. In addition, a psychrotrophic bacterium containing a psychrotrophic bacterium is accommodated in the second tank, and the first tank and the second tank are kept warm within the activation temperature range of the psychrophilic methane bacterium. In the inside, it is hydrolyzed by the hydrolyzing bacteria group of the digested sludge, then introduced into the second tank and gasified by the low temperature methane bacteria group, and then the digested sludge from the second tank is adjusted to the sludge concentration. After the process of increasing, the first
It is characterized by returning to the tank of.
F.作用 中温メタン発酵消化汚泥中の加水分解菌は、発酵原料の
基質に適合しているから、これにより第１の槽にて発酵
原料が加水分解される。それ後加水分解された基質は第
２の槽にて低温メタン菌群によりガス化される。そして
第２の槽には基質に適合した加水分解菌が流入し、また
第１の槽には、低温メタン菌が流入するため、時間の経
過と共に双方の槽で加水分解とガス化とが進行する。F. Action The hydrolyzing bacteria in the mesophilic methane fermentation digested sludge are compatible with the substrate of the fermentation raw material, and thus the fermentation raw material is hydrolyzed in the first tank. After that, the hydrolyzed substrate is gasified by the low temperature methane bacteria group in the second tank. Then, since the hydrolyzing bacteria suitable for the substrate flow into the second tank and the low temperature methane bacteria flow into the first tank, hydrolysis and gasification proceed in both tanks over time. To do.
G.実施例 第１図は、本発明の方法を実施するためのシステムを示
す構成図であり、この実施例では発酵原料として豚糞の
搾汁液が用いられる。先ず発酵原料の基質と類似の基質
である下水汚泥（人糞）を用いて予め中温メタン発酵を
行うことにより得られた中温メタン発酵消化汚泥を種菌
として第１の槽１に収容して、温度25〜30℃に保温す
る。また自然界より採取した低温メタン菌を含む低温菌
を第２の槽２に収容して、温度15〜25℃に保温する。そ
して豚糞の搾汁液を第１の槽１に投入し、次いで第２の
槽２に流入させる。この場合HRT（水理学的滞留時間）
を第１の槽１については、25日以上、第２の槽２につい
ては75日以上に設定し、有機物の槽容積当たりの負荷は
1kg/m3／日以上としている。更に第２の槽２より流出し
た消化汚泥を汚泥貯留槽３に貯留し、静置して濃縮す
る。その後濃縮された消化汚泥の一部を汚泥返送ポンプ
４により第１の槽１に返送する。G. Example FIG. 1 is a block diagram showing a system for carrying out the method of the present invention. In this example, a swine dung juice is used as a fermentation raw material. First, the sewage sludge (human feces), which is a substrate similar to the substrate of the fermentation raw material, is used to store the medium-temperature methane-fermenting digested sludge obtained in advance by performing the medium-temperature methane fermentation in the first tank 1 as the inoculum, and Keep warm at 25-30 ° C. In addition, cold bacteria containing cold methane bacteria collected from nature are stored in the second tank 2 and kept at a temperature of 15 to 25 ° C. Then, the squeezed liquid of pig manure is put into the first tank 1 and then allowed to flow into the second tank 2. In this case HRT (hydraulic retention time)
Is set to 25 days or more for the first tank 1 and 75 days or more for the second tank 2, and the load per tank volume of organic matter is
1kg / m 3 / day or more. Further, the digested sludge flowing out from the second tank 2 is stored in the sludge storage tank 3 and allowed to stand still to be concentrated. After that, a part of the concentrated digested sludge is returned to the first tank 1 by the sludge return pump 4.
このような方法によれば、前記中温メタン発酵消化汚泥
に含まれる加水分解菌は、豚糞と人糞との基質が類似し
ているため、投入された発酵原料の基質に既に適合して
おり、従って第１の槽１内にて基質を加水分解する。こ
の場合中温メタン菌は30℃以下の温度では活性化が低い
のでここではガス化はほとんど進行しない。次いで加水
分解された基質が第２の槽２内に入り、低温メタン菌群
によりガス化が行われる。この第２の槽２内では、低温
菌に含まれる加水分解菌は運転開始時には豚糞の基質に
適合していないため、加水分解はほとんど行われない。
しかしながら第２の槽２より流出した消化汚泥は濃縮さ
れた後第１の槽１に返送されるため、当該槽１内の低温
メタン菌の菌体数が増加し、加水分解だけでなくガス化
も行われるようになる。また第２の槽２においては、豚
糞の基質に適合した加水分解菌が第１の槽１より流入し
てくるのでその菌体数が増加し、次第に有機酸濃度の低
下とガス発生量の増加とが見られるようになる。こうし
て時間の経過と共に第１の槽１及び第２の槽２の双方に
て、加水分解とガス化との両方の反応が促進されるよう
になる。そして異種基質に対する馴養が順調に進行した
低温菌を用いたメタン発酵においては、加水分解よりも
ガス化の方が律速段階となるので、第１の槽１の温度を
第２の槽２の温度と同じになるまで下げても発酵効率は
著しく低下しない。従って保温に必要なエルネギーを抑
えるため第１の槽１における加水分解及びガス化がある
程度進行した時点でその温度を下げるようにする。しか
しながら第１の槽１及び第２の槽２の平均発酵温度があ
まり低下すると、ガス化速度が低下して有機酸濃度が上
昇しやすくなるので、その濃度が上昇しないように負荷
を調整する必要がある。負荷調整の指標としては、例え
ば基質投入後１日経過時における第２の槽２の酢酸濃度
を用いることができ、この場合酢酸濃度が100ppm以下で
あれば負荷を高め、100ppmを越えていれば負荷を低減す
る。良好なメタン発酵が行われていれば１日１回の半連
続的基質投入の場合、通常基質投入後１日経過時には酢
酸濃度が100ppm以下になっている。According to such a method, the hydrolyzing bacteria contained in the medium-temperature methane fermentation digested sludge, since the substrates of pig dung and human dung are similar, they are already compatible with the substrate of the input fermentation raw material. Therefore, the substrate is hydrolyzed in the first tank 1. In this case, the mesophilic methane bacterium has low activation at a temperature of 30 ° C. or lower, so that gasification hardly progresses here. Next, the hydrolyzed substrate enters the second tank 2 and is gasified by the low temperature methane bacteria group. In this second tank 2, the hydrolyzing bacteria contained in the psychrophilic bacteria are not compatible with the substrate of pig feces at the start of operation, and therefore hydrolysis is hardly performed.
However, the digested sludge flowing out from the second tank 2 is concentrated and then returned to the first tank 1, so that the number of low-temperature methane bacteria in the tank 1 increases, and not only hydrolysis but also gasification. Will also be done. In the second tank 2, hydrolyzing bacteria compatible with the substrate of swine feces flow in from the first tank 1, so that the number of bacteria increases, and the concentration of organic acid decreases and the amount of gas generated gradually increases. Will be seen to increase. Thus, with the passage of time, both the hydrolysis and gasification reactions are promoted in both the first tank 1 and the second tank 2. Further, in methane fermentation using a psychrophilic bacterium in which acclimation to different substrates has proceeded smoothly, gasification is the rate-determining step rather than hydrolysis, so the temperature of the first tank 1 is changed to the temperature of the second tank 2. The fermentation efficiency does not decrease remarkably even if it is lowered to the same value as. Therefore, in order to suppress the energy required for heat retention, the temperature is lowered when the hydrolysis and gasification in the first tank 1 have progressed to some extent. However, if the average fermentation temperature of the first tank 1 and the second tank 2 is too low, the gasification rate is decreased and the organic acid concentration is likely to increase. Therefore, it is necessary to adjust the load so that the concentration does not increase. There is. As an index for load adjustment, for example, the acetic acid concentration in the second tank 2 one day after the introduction of the substrate can be used. In this case, if the acetic acid concentration is 100 ppm or less, the load is increased, and if it exceeds 100 ppm. Reduce the load. If good methane fermentation is carried out, in the case of semi-continuous substrate input once a day, the acetic acid concentration is usually 100 ppm or less one day after substrate input.
豚糞搾汁液を基質とした場合、発酵温度20℃においては
総HRTが35日、有機物負荷が3kg/m3／日を目標とし、ま
た発酵温度15℃においては総HRTが45日、有機物負荷が2
kg/cm3／日を目標として次第に負荷を高めていく。この
ようにして運転していくことにより運転開始後２〜３ケ
月でガス発生量が安定し、定常運転が可能になる。When using pig dung juice as a substrate, a total HRT of 35 days and an organic load of 3 kg / m 3 / day are targeted at a fermentation temperature of 20 ° C, and a total HRT of 45 days and an organic load of 15 ° C. Is 2
The load will be gradually increased with the goal of kg / cm 3 / day. By operating in this way, the gas generation amount becomes stable within a few months after the start of operation, and steady operation becomes possible.
ここで豚糞搾汁液を基質とし、初期運転を２〜３ケ月行
った後、第１及び第２の各総1,2の温度が25℃,15℃の各
条件において表１の運転条件を設定して運転し、体積効
率（タンク容積当たり１日当たりガス発生量）を調べた
ところ同表に示す結果が得られた。Here, using pig dung juice as a substrate, after performing the initial operation for 2 to 3 months, the operating conditions shown in Table 1 were applied under the conditions of the first and second total temperatures 1 and 2 of 25 ° C and 15 ° C, respectively. When the volume efficiency (gas generation amount per day per tank volume) was examined by setting and operating, the results shown in the same table were obtained.
また下水汚泥を用いて得られた上記の中温メタン発酵消
化汚泥のみを用い、豚糞の搾汁液を基質として運転を行
い、定常運転に至ったところで発酵温度20℃及び15℃の
条件下で夫々同様の運転を行った。体積効率は、20℃に
おいては0.60m3／m3／日、15℃では0.15m3／m3／日であ
った。従って低温菌によるメタン発酵は、中温菌の場合
と比較して20℃では1.67倍、15℃では３倍の体積効率が
得られる。 In addition, using only the above-mentioned medium-temperature methane fermentation digestion sludge obtained using sewage sludge, operation was performed using the squeezed juice of pig feces as a substrate, and when steady operation was reached, the fermentation temperature was 20 ° C and 15 ° C, respectively. The same operation was performed. The volumetric efficiency was 0.60 m 3 / m 3 / day at 20 ° C and 0.15 m 3 / m 3 / day at 15 ° C. Therefore, the methane fermentation by the psychrophilic bacteria is 1.67 times more efficient at 20 ° C and 3 times more efficient at 15 ° C as compared with the case of mesophilic bacteria.
なお養豚場では、伝染病を避けるために種菌を馴養する
基質として豚糞を用いることを嫌い、この点から上述実
施例では、下水汚泥により得られた中温メタン発酵消化
汚泥を用いている。しかしながらこのような制限がない
場合には、発酵原料と同種の基質により得られた中温メ
タン発酵消化汚泥を用いることができる。In swine farms, it is disliked to use pig manure as a substrate for accommodating inoculum in order to avoid infectious diseases. From this point, in the above-mentioned examples, the medium temperature methane fermentation digested sludge obtained from sewage sludge is used. However, if there is no such limitation, the medium temperature methane fermentation digested sludge obtained from the same substrate as the fermentation raw material can be used.
H.発明の効果 本発明によれば、発酵原料の基質に適合している加水分
解菌により第１の槽にて基質を加水分解し、この加水分
解された基質が低温菌を収容した第２の槽に流入するた
め、この中の低温メタン菌により基質を直ちにガス化す
ることができるので低温メタン菌が増殖する。そして第
２の槽内には基質に適合した加水分解菌も流入してくる
ため、第２の槽にてガス化のみならず加水分解も進行す
るようになる。更に第２の槽より消化汚泥が第１の槽に
返送されるため、第１の槽では、中温メタン菌にとって
は活性化の低い低温であっても低温メタン菌の増加によ
り加水分解と共にガス化も進行するようになる。この結
果運転開始後短時間で第１の槽及び第２の槽は低温メタ
ン発酵を高い能力で行うことができる状態になり、シス
テムの立上がりが早くなる。H. Effect of the Invention According to the present invention, the substrate is hydrolyzed in the first tank by a hydrolyzing bacterium that is compatible with the substrate of the fermentation raw material, and the hydrolyzed substrate is the second Since it flows into the tank, the substrate can be immediately gasified by the low temperature methane bacterium, so that the low temperature methane bacterium grows. Then, since hydrolyzing bacteria suitable for the substrate also flow into the second tank, not only gasification but also hydrolysis proceeds in the second tank. Furthermore, since digested sludge is returned to the first tank from the second tank, in the first tank, gasification occurs along with hydrolysis due to an increase in low-temperature methane bacteria even at low temperatures where activation is low for mesophilic methane bacteria. Will also proceed. As a result, the first tank and the second tank are brought into a state in which the low-temperature methane fermentation can be carried out with high capacity within a short time after the start of operation, and the system starts up quickly.
しかも２つの槽を用いて、加水分解菌及び低温メタン菌
を互いに流入させて加水分解、ガス化を進行させている
から、別個に温度コントロールやHRT等を調整できるた
め、単一の槽に中温メタン発酵消化汚泥及び低温菌を投
入する場合に比べて状況に応じたきめ細かい制御がで
き、これにより安定した結果が得られる。Moreover, using two tanks, hydrolyzing bacteria and low temperature methane bacteria are introduced into each other to promote hydrolysis and gasification, so temperature control and HRT can be adjusted separately, so a single tank can be used at medium temperature. Compared to the case of adding methane fermentation digested sludge and psychrophilic bacteria, fine control can be performed according to the situation, and stable results can be obtained.
第１図は本発明方法を実施するためのシステムの一例を
示す構成図である。 １……第１の槽、２……第２の槽、３……汚泥貯留槽、
４……汚泥返送ポンプ。FIG. 1 is a block diagram showing an example of a system for carrying out the method of the present invention. 1 ... First tank, 2 ... Second tank, 3 ... Sludge storage tank,
4 ... Sludge return pump.
Claims (1)
用いて中温メタン発酵を行うことにより得られた中温メ
タン発酵消化汚泥を第１の槽に収容すると共に低温メタ
ン菌を含む低温菌を第２の槽に収容して、これら第１の
槽及び第２の槽を低温メタン菌の活性化温度範囲内に保
温し、 発酵原料を前記第１の槽内にて前記消化汚泥の加水分解
菌群により加水分解し、次いで前記第２の槽に導入して
低温メタン菌群によりガス化し、次に前記第２の槽より
の消化汚泥を、汚泥濃度を高める処理をした後前記第１
の槽に返送することを特徴とする低温メタン発酵の初期
運転方法。1. A mesophilic methane fermentation digested sludge obtained by carrying out mesophilic methane fermentation using a substrate similar to or similar to a substrate of a fermentation raw material is contained in a first tank and a psychrophilic bacterium containing a psychrophilic methane bacterium. The first tank and the second tank are housed in a second tank, and the first tank and the second tank are kept warm within the activation temperature range of the low temperature methane bacteria, and the fermentation raw material is hydrolyzed in the digested sludge in the first tank. After being hydrolyzed by the bacteria group, then introduced into the second tank and gasified by the low temperature methane bacteria group, and then the digested sludge from the second tank is treated to increase the sludge concentration, and then the first
The initial operation method of low-temperature methane fermentation, which is characterized in that the low-temperature methane fermentation is returned to the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8631187A JPH0738994B2 (en) | 1987-04-08 | 1987-04-08 | Initial operation method of low temperature methane fermentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8631187A JPH0738994B2 (en) | 1987-04-08 | 1987-04-08 | Initial operation method of low temperature methane fermentation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63252598A JPS63252598A (en) | 1988-10-19 |
| JPH0738994B2 true JPH0738994B2 (en) | 1995-05-01 |
Family
ID=13883290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8631187A Expired - Lifetime JPH0738994B2 (en) | 1987-04-08 | 1987-04-08 | Initial operation method of low temperature methane fermentation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738994B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3820216B2 (en) * | 2002-12-20 | 2006-09-13 | 三菱重工業株式会社 | Operation method of medium temperature digester |
| JP5873736B2 (en) * | 2012-02-29 | 2016-03-01 | 水ｉｎｇ株式会社 | Organic wastewater treatment method and treatment apparatus |
| JP6954853B2 (en) * | 2018-02-20 | 2021-10-27 | 水ｉｎｇ株式会社 | Anaerobic digestion start-up method and anaerobic digestion start-up system |
| JP7752088B2 (en) * | 2022-04-06 | 2025-10-09 | 株式会社神鋼環境ソリューション | Mesophilic methane fermentation treatment device and method for operating the same |
-
1987
- 1987-04-08 JP JP8631187A patent/JPH0738994B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63252598A (en) | 1988-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Obileke et al. | Anaerobic digestion: Technology for biogas production as a source of renewable energy—A review | |
| Bouallagui et al. | Bioreactor performance in anaerobic digestion of fruit and vegetable wastes | |
| CN102921711B (en) | Organic solid waste regeneration resource treatment method and apparatus system thereof | |
| CN101058097B (en) | Resource using method for food and drink garbage | |
| EP1473279A1 (en) | Apparatus and process for the anaerobic digestion of biomass and production of biogas | |
| CN102227383A (en) | Systems and methods for anaerobic digestion and collection of products | |
| WO1995018073A1 (en) | Method of anaerobic digestion of sewage sludge | |
| WO2006056819A1 (en) | Method for increased production of biogas | |
| CN108866116B (en) | Method for preparing medium-chain fatty acid from organic waste by utilizing carbon chain extension | |
| CN109867428A (en) | A kind of method of sludge dual treatment disposition | |
| JPH0783878B2 (en) | Sewage sludge treatment method | |
| Carotenuto et al. | Biogas production from anaerobic digestion of manure at different operative conditions | |
| Radwan et al. | Dry anaerobic fermentation of agricultural residues | |
| CN106318982A (en) | Method for producing biogas by carrying out alkalization treatment on biomass straw | |
| JP4011439B2 (en) | Method and apparatus for methane fermentation of organic waste | |
| CN114906999B (en) | Method for improving sequencing batch anaerobic digestion performance of cow dung by gradient heating method | |
| JPH0738994B2 (en) | Initial operation method of low temperature methane fermentation | |
| JPS6291293A (en) | Wastewater treatment method based on anaerobic treatment | |
| JP2659895B2 (en) | Organic sludge treatment method | |
| JPS602920B2 (en) | Anaerobic sludge digestion method | |
| CN113772814B (en) | Efficient multi-dimensional carbon source and preparation method thereof | |
| EP0484867A1 (en) | Process for the utilization of organic wastes for producing biogas and agricultural products | |
| Ghaly | Biogas production from dairy manure using continuous mix and no-mix mesophilic reactors | |
| CN109022494A (en) | A kind of method that the semicontinuous dry-type anaerobic fermentation of manioc waste produces biogas | |
| JP2003310245A (en) | Method for proliferating useful microorganism group and proliferation apparatus therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |