JP2009219960A - Methane fermentation process - Google Patents

Methane fermentation process Download PDF

Info

Publication number
JP2009219960A
JP2009219960A JP2008065042A JP2008065042A JP2009219960A JP 2009219960 A JP2009219960 A JP 2009219960A JP 2008065042 A JP2008065042 A JP 2008065042A JP 2008065042 A JP2008065042 A JP 2008065042A JP 2009219960 A JP2009219960 A JP 2009219960A
Authority
JP
Japan
Prior art keywords
methane fermentation
fermentation
organic waste
methane
alkalinity
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.)
Granted
Application number
JP2008065042A
Other languages
Japanese (ja)
Other versions
JP4834021B2 (en
Inventor
Yoshimasa Tomiuchi
芳昌 富内
Shigeru Maruyama
茂 丸山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metawater Co Ltd
Original Assignee
Metawater Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metawater Co Ltd filed Critical Metawater Co Ltd
Priority to JP2008065042A priority Critical patent/JP4834021B2/en
Publication of JP2009219960A publication Critical patent/JP2009219960A/en
Application granted granted Critical
Publication of JP4834021B2 publication Critical patent/JP4834021B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

<P>PROBLEM TO BE SOLVED: To provide a methane fermentation process which controls the reduction of alkalinity of a fermentation solution and which is capable of conducting the stable methane fermentation for a long time. <P>SOLUTION: The methane fermentation process for executing methane fermentation with anaerobic microorganisms by charging organic waste into a methane fermentation tank 11 comprises the steps of measuring the electric conductivity E<SB>1</SB>of the organic waste and the electric conductivity E<SB>1</SB>of the fermentation solution in the methane fermentation tank 11, and executing a means to raise the ammonia nitrogen content in the fermentation solution when the difference of the electric conductivity E<SB>1</SB>of the fermentation solution in the fermentation tank 11 and the electric conductivity E<SB>1</SB>of the organic waste is not larger than a predetermined value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、嫌気性微生物を用いて、糞尿、生ゴミ、食品加工残滓等の有機性廃棄物を処理するメタン発酵処理方法に関する。   The present invention relates to a methane fermentation treatment method for treating organic waste such as manure, raw garbage, food processing residue and the like using anaerobic microorganisms.

メタン発酵処理は、有機性廃棄物を嫌気性下でメタン菌により発酵処理することで、有機性廃棄物をメタンガスに転換するもので、有機性廃棄物をバイオガスと水とに分解して大幅に減量することができ、嫌気性のため曝気動力が不要であるため省エネルギーな処理法である。しかも、副産物として生成するメタンガスをエネルギーとして回収できるメリットがある。   Methane fermentation treatment converts organic waste into methane gas by fermenting organic waste under anaerobic conditions with methane bacteria, and decomposes organic waste into biogas and water. This is an energy-saving treatment method because aeration power is unnecessary because it is anaerobic. In addition, there is a merit that methane gas generated as a by-product can be recovered as energy.

メタン発酵処理においては、有機性廃棄物の発酵状態が安定しているときは、有機性廃棄物が規定量投入されていればバイオガスが一定量生成する。しかし、メタン発酵槽内の発酵温度や、有機性廃棄物の投入量及び性状などの変動によって発酵状態が変動する。この発酵状態の変動は、発酵性能を低下させる要因となっている。   In the methane fermentation treatment, when the fermentation state of the organic waste is stable, a certain amount of biogas is generated if a specified amount of the organic waste is input. However, the fermentation state varies depending on the fermentation temperature in the methane fermenter, the input amount and properties of organic waste, and the like. This variation in the fermentation state is a factor that reduces the fermentation performance.

発酵性能が低下するのは、主としてメタン発酵に関係する嫌気性細菌群の活性が低下するためであり、活性の低下要因としては、pHや温度の他にアンモニアなどの阻害物質の生成がある。特にアンモニア性窒素濃度が所定濃度以下になるように発酵状態を制御する技術が知られている。   The reason why the fermentation performance is reduced is that the activity of the anaerobic bacteria group mainly related to methane fermentation is reduced, and as a factor of the decrease in activity, there is generation of an inhibitor such as ammonia in addition to pH and temperature. In particular, a technique for controlling the fermentation state so that the ammoniacal nitrogen concentration is a predetermined concentration or less is known.

特許文献1には、メタン発酵槽内の発酵液の電気伝導率は、アンモニア性窒素濃度と相関関係にあることが記載されており、メタン発酵槽内の電気伝導率と、スラリー調整槽内の電気伝導率とを測定し、発酵槽測定値と、スラリー調整槽内の電気伝導率である調整槽測定値との差が所定値以上のときに、メタン発酵槽内の電気伝導率を下げてメタン発酵処理を行うことが開示されている。
特許第3630165号公報
Patent Document 1 describes that the electrical conductivity of the fermentation liquor in the methane fermentation tank is correlated with the ammoniacal nitrogen concentration, and the electrical conductivity in the methane fermentation tank and the slurry adjustment tank Measure the electrical conductivity, and when the difference between the fermentation tank measurement value and the adjustment tank measurement value, which is the electrical conductivity in the slurry adjustment tank, is greater than or equal to a predetermined value, lower the electrical conductivity in the methane fermentation tank. Performing a methane fermentation process is disclosed.
Japanese Patent No. 3630165

嫌気性プロセスにおけるアルカリ度の基本的な役割は、炭酸酸性度を緩衝することである。例えば、「産業廃水処理のための嫌気性バイオテクノロジー」(p17 技報堂出版 R.E.Speece原著)には、二酸化炭素濃度が20%のガス相と平衡状態にあるとき、イオン強度0.2の液相をpH7に緩衝するためには、少なくとも2000mg/L以上のアルカリ度が必要である旨が記載されている。また、一般的には、メタン発酵を安定に保つためには、およそ3000mg/Lのアルカリ度が必要とされている。   The basic role of alkalinity in the anaerobic process is to buffer carbonic acidity. For example, “Anaerobic biotechnology for industrial wastewater treatment” (p17 Gihodo Shuppan RIE Speed original) has an ionic strength of 0.2 when the carbon dioxide concentration is in equilibrium with a gas phase of 20%. It describes that an alkalinity of at least 2000 mg / L or more is necessary to buffer the liquid phase at pH 7. In general, an alkalinity of about 3000 mg / L is required to keep methane fermentation stable.

このように、発酵液のアルカリ度が低下すると、メタン発酵槽内の発酵液内の炭酸イオンを緩衝しきれなくなるので、発酵液のpHが低下して、メタン発酵性能が低下する。   Thus, when the alkalinity of a fermentation liquid falls, since it becomes impossible to buffer the carbonate ion in the fermentation liquid in a methane fermentation tank, pH of a fermentation liquid falls and methane fermentation performance falls.

上記特許文献1には、電気伝導率を用いてアンモニア性窒素の阻害領域にならないように希釈水によってアンモニア性窒素濃度を低下させることが示されているが、アルカリ度が不足する場合の対処法については、なんら開示されていない。   In the above-mentioned Patent Document 1, it is shown that the ammonia nitrogen concentration is lowered with diluted water so as not to be in the ammonia nitrogen inhibition region by using electric conductivity. Is not disclosed at all.

したがって、本発明の目的は、発酵液のアルカリ度の低下を抑制し、長期にわたって安定したメタン発酵を行うことができるメタン発酵処理方法を提供することである。   Accordingly, an object of the present invention is to provide a methane fermentation treatment method that can suppress a decrease in alkalinity of a fermentation broth and perform stable methane fermentation over a long period of time.

上記目的を達成するため、本発明のメタン発酵処理方法は、有機性廃棄物をメタン発酵槽内に投入し、嫌気性微生物によりメタン発酵させるメタン発酵処理方法において、前記有機性廃棄物の電気伝導率と、前記メタン発酵槽内の発酵液の電気伝導率とを測定し、前記メタン発酵槽内の発酵液の電気伝導率と、前記有機性廃棄物の電気伝導率との差が所定値以下の場合には、前記発酵液中のアルカリ度を高める手段を施すことを特徴とする。   In order to achieve the above object, the methane fermentation treatment method of the present invention is the methane fermentation treatment method in which an organic waste is introduced into a methane fermentation tank and subjected to methane fermentation by anaerobic microorganisms. The electrical conductivity of the fermentation liquid in the methane fermentation tank and the difference between the electrical conductivity of the fermentation liquid in the methane fermentation tank and the electrical conductivity of the organic waste is below a predetermined value. In this case, a means for increasing the alkalinity in the fermentation broth is applied.

メタン発酵槽内の発酵液の電気伝導率は、アンモニア性窒素濃度と相関関係を有しているが、メタン発酵槽に投入される有機性廃棄物は、Na、K、Ca、Mgなどを含んでいるので、未発酵状態でも電気伝導率を有している。このため、メタン発酵槽に存在するアンモニア性窒素分を精度よく電気伝導率として換算するためには、投入する下水汚泥などの有機性廃棄物に当初から存在する塩濃度を電気伝導率として計測して、上記の発酵槽測定値から除く必要がある。そこで、メタン発酵槽内の発酵液の電気伝導率の測定値から、メタン発酵槽に投入する有機性廃棄物の電気伝導率の測定値を減ずることで、アンモニア性窒素濃度と相関の取れた電気伝導率値が得られる。
そして、本発明では、上記電気伝導率の差が所定値以下となったら、発酵液中のアルカリ度を高めるようにするので、pH上昇を抑制し、安定した発酵状態を維持することができる。
The electrical conductivity of the fermentation broth in the methane fermenter has a correlation with the ammoniacal nitrogen concentration, but the organic waste introduced into the methane fermenter contains Na, K, Ca, Mg, etc. Therefore, it has electrical conductivity even in an unfermented state. Therefore, in order to accurately convert the ammonia nitrogen content in the methane fermenter as electrical conductivity, the salt concentration present from the beginning in the organic waste such as sewage sludge to be input is measured as electrical conductivity. Therefore, it is necessary to exclude from the above fermenter measurement values. Therefore, by subtracting the measured value of the electrical conductivity of the organic waste to be introduced into the methane fermentation tank from the measured value of the electrical conductivity of the fermentation broth in the methane fermentation tank, A conductivity value is obtained.
And in this invention, since the alkalinity in a fermented liquor will be raised if the difference of the said electrical conductivity becomes below a predetermined value, pH rise can be suppressed and the stable fermentation state can be maintained.

本発明のメタン発酵処理方法は、前記電気伝導率の差が4mS/cm以下となったときに、前記発酵液中のアルカリ度を高める手段を施すことが好ましい。上記電気伝導率の差とアルカリ度は相関関係にある。そして、該電気伝導率の差が4mS/cm以下となったとき、発酵液中のアルカリ度を高めるようにすることで、発酵液のアルカリ度をおよそ3000mg/L以上に保つことができるので、発酵液のpH低下をより効果的に抑制できる。   In the methane fermentation treatment method of the present invention, it is preferable to provide means for increasing the alkalinity in the fermentation broth when the difference in electrical conductivity is 4 mS / cm or less. The difference in electrical conductivity and the alkalinity are correlated. And when the difference in electrical conductivity is 4 mS / cm or less, the alkalinity of the fermentation broth can be maintained at about 3000 mg / L or more by increasing the alkalinity in the fermentation broth. It is possible to more effectively suppress the pH drop of the fermentation broth.

本発明のメタン発酵処理方法は、前記発酵液中のアルカリ度を高める手段が、前記メタン発酵槽に供給する有機性廃棄物の濃度を増加させることからなることが好ましい。有機性廃棄物の濃度を高めることにより、発酵により分解される有機物が増え、結果としてアンモニア性窒素が増大するため、アルカリ度を高めることができる。   In the methane fermentation treatment method of the present invention, it is preferable that the means for increasing the alkalinity in the fermentation liquid comprises increasing the concentration of organic waste supplied to the methane fermentation tank. By increasing the concentration of organic waste, the amount of organic matter decomposed by fermentation increases, resulting in an increase in ammoniacal nitrogen, so that the alkalinity can be increased.

本発明のメタン発酵処理方法は、前記発酵液中のアルカリ度を高める手段が、前記メタン発酵槽に供給する有機性廃棄物に、窒素分を多く含む他の有機性廃棄物を加えて、窒素濃度を増加させることからなることが好ましい。有機性廃棄物の窒素濃度を高めることにより、発酵により分解されるアンモニア性窒素が増大するため、アルカリ度を高めることができる。   In the methane fermentation treatment method of the present invention, the means for increasing the alkalinity in the fermentation broth adds other organic waste containing a large amount of nitrogen to the organic waste supplied to the methane fermentation tank, Preferably it consists of increasing the concentration. By increasing the nitrogen concentration of the organic waste, ammoniacal nitrogen decomposed by fermentation increases, so that the alkalinity can be increased.

本発明のメタン発酵処理方法は、前記発酵液中のアルカリ度を高める手段が、前記有機性廃棄物を可溶化し、菌体中に含まれる窒素分を分解し易くして前記メタン発酵槽に供給することからなることが好ましい。有機性廃棄物を可溶化すれば、汚泥細胞などの細胞壁が破壊されて内部のタンパク質が可溶化されるので、窒素からアンモニアへの転換率が向上し、発酵液中のアンモニア性窒素濃度が増加するので、アルカリ度を高めることが可能となる。   In the methane fermentation treatment method of the present invention, the means for increasing the alkalinity in the fermentation broth solubilizes the organic waste, facilitates decomposition of nitrogen contained in the bacterial cells, Preferably it consists of supplying. If organic waste is solubilized, cell walls such as sludge cells are destroyed and internal proteins are solubilized, improving the conversion rate from nitrogen to ammonia and increasing the concentration of ammoniacal nitrogen in the fermentation broth. Therefore, the alkalinity can be increased.

本発明のメタン発酵処理方法は、前記発酵液中のアルカリ度を高める手段が、前記有機性廃棄物にアンモニア化合物を添加することからなることが好ましい。有機性廃棄物に、アンモニア化合物を添加することで、窒素濃度を高めることになり、発酵により分解される有機物が増え、結果としてアンモニア性窒素が増大するため、アルカリ度を高めることができる。   In the methane fermentation treatment method of the present invention, it is preferable that the means for increasing the alkalinity in the fermentation liquid comprises adding an ammonia compound to the organic waste. By adding an ammonia compound to the organic waste, the nitrogen concentration is increased, the amount of organic matter decomposed by fermentation is increased, and as a result, ammonia nitrogen is increased, so that the alkalinity can be increased.

本発明によれば、発酵液のアルカリ度の低下を防止して、長期にわたって安定したメタン発酵処理を行うことができる。   ADVANTAGE OF THE INVENTION According to this invention, the fall of the alkalinity of a fermentation liquid can be prevented and the methane fermentation process stabilized over the long term can be performed.

以下、本発明について図面を用いて更に詳細に説明する。図1には、本発明のメタン発酵処理方法に用いることができるメタン発酵処理装置の第一の実施形態の概略構成図が示されている。   Hereinafter, the present invention will be described in more detail with reference to the drawings. The schematic block diagram of 1st embodiment of the methane fermentation processing apparatus which can be used for the methane fermentation processing method of this invention is shown by FIG.

この処理装置は、下水汚泥などの有機性廃棄物を貯留する貯留槽10と、窒素含有物供給槽12と、希釈水槽13と、メタン発酵槽11とで主に構成されている。   This processing apparatus mainly includes a storage tank 10 for storing organic waste such as sewage sludge, a nitrogen-containing material supply tank 12, a dilution water tank 13, and a methane fermentation tank 11.

窒素含有物供給槽12としては、貯留槽10内に貯留された有機性廃棄物よりも窒素含有量の高い窒素含有物が貯留された槽であれば特に限定はなく、(a)タンパク質含量の高い生ごみ(好ましくは肉類や魚類などを多く含む生ごみ)などの食品残渣をスラリー化して貯留するスラリー槽や、(b)廃液処理装置などで窒素含有廃液を脱窒処理した際に排出される窒素分を多く含有する余剰汚泥の貯留槽や、(c)炭酸アンモニウム、炭酸水素アンモニウム、硫酸アンモニウム、塩化アンモニウムなどのアンモニア化合物の貯留槽などが一例として挙げられる。   The nitrogen-containing material supply tank 12 is not particularly limited as long as it is a tank in which a nitrogen-containing material having a higher nitrogen content than the organic waste stored in the storage tank 10 is stored. Slurry tanks for storing food residues such as high garbage (preferably garbage containing a lot of meat and fish) and slurry storage, (b) discharged when nitrogen-containing waste liquid is denitrified by waste liquid treatment equipment, etc. Examples include a storage tank for excess sludge containing a large amount of nitrogen and (c) a storage tank for ammonia compounds such as ammonium carbonate, ammonium hydrogen carbonate, ammonium sulfate, and ammonium chloride.

メタン発酵槽11の上流側には、貯留槽10と、窒素含有物供給槽12と、希釈水槽13が配置されている。   A storage tank 10, a nitrogen-containing material supply tank 12, and a dilution water tank 13 are arranged on the upstream side of the methane fermentation tank 11.

貯留槽10とメタン発酵槽11とを接続する配管L1には、ポンプP1が介装されている。また、窒素含有物供給槽12とメタン発酵槽11とを接続する配管L2には、ポンプP2が介装されている。また、希釈水槽13とメタン発酵槽11とを接続する配管L3には、ポンプP3が介装されている。   A pump P1 is interposed in the pipe L1 connecting the storage tank 10 and the methane fermentation tank 11. A pump P2 is interposed in the pipe L2 connecting the nitrogen-containing material supply tank 12 and the methane fermentation tank 11. A pump P3 is interposed in the pipe L3 connecting the dilution water tank 13 and the methane fermentation tank 11.

メタン発酵槽11の上部からは、槽内でのメタン発酵処理で発生したバイオガスを取り出すための配管L4が伸びており、図示しないガスホルダーなどに接続している。また、メタン発酵槽11の下部からは、排出ポンプP4が介装された配管L5が伸びており、図示しない廃液処理装置などに接続している。   From an upper part of the methane fermentation tank 11, a pipe L4 for taking out biogas generated by the methane fermentation process in the tank extends and is connected to a gas holder (not shown). Further, from the lower part of the methane fermentation tank 11, a pipe L5 provided with a discharge pump P4 extends and is connected to a waste liquid treatment apparatus (not shown).

貯留槽10及びメタン発酵槽11には、電気伝導率計30、31がそれぞれ接続されており、貯留槽10に貯留された有機性廃棄物、及び、メタン発酵槽11内の発酵液の電気伝導率が測定可能となっている。電気伝導率計30、31としては従来公知のものを用いることができ特に限定されない。   Electrical conductivity meters 30 and 31 are connected to the storage tank 10 and the methane fermentation tank 11, respectively, and the organic waste stored in the storage tank 10 and the electrical conductivity of the fermentation liquid in the methane fermentation tank 11. The rate is measurable. As the electric conductivity meters 30 and 31, conventionally known ones can be used and are not particularly limited.

この電気伝導率計30、31からの測定値は、演算器であるPLC40(プログラマブルロジックコントローラ)に入力されるように構成されており、PLC40では、例えば、図2のフローチャートに示すような演算処理が行われている。   The measured values from the electric conductivity meters 30 and 31 are configured to be input to a PLC 40 (programmable logic controller) which is an arithmetic unit. In the PLC 40, for example, arithmetic processing as shown in the flowchart of FIG. Has been done.

PLC40による演算処理及び制御の一例について、図2を用いて説明する。   An example of arithmetic processing and control by the PLC 40 will be described with reference to FIG.

まず、ステップS1にて、電気伝導率計30を用いて測定された貯留槽10内の電気伝導率EがPLC40に入力される。 First, in step S 1, the electrical conductivity E 1 in the storage tank 10 measured using the electrical conductivity meter 30 is input to the PLC 40.

次に、ステップS2にて、電気伝導率計31を用いて測定されたメタン発酵槽11内の発酵液の電気伝導率EがPLC40に入力される。ステップS1及びステップS2の工程は、ほぼ同時に行なわれている。 Next, in step S <b> 2, the electrical conductivity E <b> 2 of the fermentation liquid in the methane fermentation tank 11 measured using the electrical conductivity meter 31 is input to the PLC 40. Steps S1 and S2 are performed almost simultaneously.

ステップS3では、それぞれの電気伝導率の測定値の差(E−E)が所定値Xを超えているかどうかの判断が行われる。所定値Xを超えている場合は、ステップS4に移り、ポンプP3を作動してメタン発酵槽11に希釈水を供給し、ステップS1に戻る。一方、所定値Xを下回っている場合は、ステップS5へ移る。 In step S3, it is determined whether or not the difference (E 2 −E 1 ) between the measured values of the respective electrical conductivities exceeds a predetermined value X 1 . If the difference exceeds the predetermined value X 1, the procedure proceeds to step S4, and operates the pump P3 to supply dilution water to the methane fermentation tank 11, the flow returns to step S1. On the other hand, if you are below a predetermined value X 1, and proceeds to step S5.

ステップS5では、測定値の差(E−E)が所定値X(ただし、X>Xである)を下回っているかどうかの判断が行われる。所定値Xを下回っている場合は、ステップS6へ移る。ステップS6では、ポンプP2を作動させて、メタン発酵槽11に窒素含有物を供給して、メタン発酵槽11内の窒素濃度を増加させて、ステップS1に戻る。メタン発酵槽11内の窒素濃度が増加すると、メタン発酵処理時に生成するアンモニア性窒素が増加するので、発酵液のアンモニア性窒素濃度が上昇して、アルカリ度が上昇する。 In step S5, it is determined whether or not the difference between measured values (E 2 −E 1 ) is less than a predetermined value X 2 (where X 1 > X 2 ). If below the predetermined value X 2, it moves to step S6. In step S6, the pump P2 is operated to supply a nitrogen-containing material to the methane fermentation tank 11, the nitrogen concentration in the methane fermentation tank 11 is increased, and the process returns to step S1. When the nitrogen concentration in the methane fermentation tank 11 is increased, ammonia nitrogen generated during the methane fermentation process is increased, so that the ammonia nitrogen concentration of the fermentation liquid is increased and the alkalinity is increased.

一方、ステップS5において、所定値Xを超えている場合は、制御終了となり、そのままの状態でメタン発酵が継続される。 On the other hand, in step S5, if the difference exceeds the predetermined value X 2, it becomes the control end, the methane fermentation is continued as it is.

次に、この処理装置を用いた、本発明のメタン発酵処理方法について説明する。   Next, the methane fermentation processing method of this invention using this processing apparatus is demonstrated.

貯留槽10に貯留された有機性廃棄物が、ポンプP1の作動によってメタン発酵槽11に供給される。   The organic waste stored in the storage tank 10 is supplied to the methane fermentation tank 11 by the operation of the pump P1.

メタン発酵槽11には、図示しないメタン菌等の嫌気性微生物が付着・担持された固定化微生物を充填した固定ろ床等が設置されており、ここで槽内に供給された有機性廃棄物が、嫌気性微生物によって分解されてメタン発酵処理される。メタン発酵処理は、50〜60℃で行なうことが好ましい。これによれば、より活性の高い、高温メタン菌での発酵が行なえるので、有機性廃棄物の分解速度を更に向上することができる。   The methane fermentation tank 11 is provided with a fixed filter bed or the like filled with immobilized microorganisms on which anaerobic microorganisms such as methane bacteria (not shown) are attached and carried, and organic waste supplied into the tank here Is decomposed by anaerobic microorganisms and subjected to methane fermentation. The methane fermentation treatment is preferably performed at 50 to 60 ° C. According to this, since the fermentation with a high-temperature methane bacterium having higher activity can be performed, the decomposition rate of the organic waste can be further improved.

なお、配管L5からは、一定時間毎に供給される有機性廃棄物と同量の発酵液が、ポンプP4によってメタン発酵槽11の底部から引き抜かれ、メタン発酵槽11内は、常に一定量の発酵液で満たされている。また、発酵により生成したバイオガスは、図示しないガスホルダーに回収され、燃料電池発電装置、ガスエンジン等の発電機やボイラーの燃料として有効利用されるようになっている。   From the pipe L5, the same amount of fermented liquid as the organic waste supplied at regular intervals is drawn from the bottom of the methane fermentation tank 11 by the pump P4, and the methane fermentation tank 11 always has a constant amount. Filled with fermentation broth. In addition, biogas produced by fermentation is collected in a gas holder (not shown) and is effectively used as a fuel for a power generator such as a fuel cell power generation device or a gas engine or a boiler.

ここで、本発明においては、貯留槽10及びメタン発酵槽11において、電気伝導率計30、31による電気伝導率の測定が行なわれ、貯留槽10の電気伝導率測定値E、発酵槽の電気伝導率測定値Eがそれぞれ得られ、これがPLC40に入力される。 Here, in the present invention, in the storage tank 10 and the methane fermentation tank 11, the electric conductivity is measured by the electric conductivity meters 30 and 31, and the measured electric conductivity value E 1 of the storage tank 10 is measured. Electrical conductivity measured values E 2 are respectively obtained and input to the PLC 40.

そして、PLC40では、発酵槽の電気伝導率測定値Eと、貯留槽10の電気伝導率測定値Eとの差が演算され、この測定値の差(E−E)に基づいて、必要に応じてポンプP2,P3を作動して、メタン発酵槽11の発酵液のアンモニア性窒素濃度が所定範囲となるように維持する。この方法では、発酵液のアンモニア性窒素濃度を上昇させることによりアルカリ度も上昇するので、発酵液のアルカリ度を増加させる際に、炭酸水素ナトリウムや炭酸ナトリウムのようなアルカリ試薬の使用量を大幅に削減、もしくは使用しないで済み、経済的にも有利である。 Then, the PLC 40, and electrical conductivity measurements E 2 of the fermenter, the difference between the electric conductivity measurement E 1 of the storage tank 10 is calculated based on the difference between the measured value (E 2 -E 1) The pumps P2 and P3 are operated as necessary to maintain the ammoniacal nitrogen concentration of the fermentation broth in the methane fermentation tank 11 within a predetermined range. This method increases the alkalinity by increasing the ammoniacal nitrogen concentration of the fermentation broth, so when increasing the alkalinity of the fermentation broth, greatly increase the amount of alkaline reagents such as sodium bicarbonate and sodium carbonate. Therefore, it can be reduced or not used, which is economically advantageous.

このように、本発明は、電気伝導率の測定値をメタン発酵状態の監視指標として利用する。メタン発酵槽内の電気伝導率は、発酵液全体のイオン性塩濃度に対応するので、アンモニウムイオンやアルカリ度と相関がある。電気伝導率は、測定が容易であり、また、測定機器も安価であるので、低コストで、かつ、ほぼリアルタイムでメタン発酵状態を監視できる。したがって、本発明によれば、発酵液のアルカリ度が低下しても、速やかにアルカリ度を上昇させることができるので、発酵状態が悪化しても、速やかに発酵状態を良好な状態にすることができる。   Thus, this invention utilizes the measured value of electrical conductivity as a monitoring index of the methane fermentation state. Since the electrical conductivity in the methane fermenter corresponds to the ionic salt concentration of the entire fermentation broth, it correlates with ammonium ions and alkalinity. The electrical conductivity can be easily measured, and the measurement equipment is also inexpensive, so that the methane fermentation state can be monitored at a low cost and almost in real time. Therefore, according to the present invention, even if the alkalinity of the fermentation liquor is lowered, the alkalinity can be quickly increased, so that even if the fermentation state is deteriorated, the fermentation state is quickly made good. Can do.

図3に、貯留槽10及びメタン発酵槽11の電気伝導率と、イオンクロマトグラフ法から測定したアンモニア性窒素濃度と、アルカリ度との相関性を測定した結果を示す。   In FIG. 3, the result of having measured the correlation with the electrical conductivity of the storage tank 10 and the methane fermenter 11, the ammonia nitrogen concentration measured from the ion chromatograph method, and alkalinity is shown.

図3に示すように、メタン発酵槽11の電気伝導率から貯留槽10の電気伝導率を減じた値(以下、「電気伝導率の差分」と記す)は、発酵液のアンモニア性窒素濃度と相関関係にあり、電気伝導率の差分と、アンモニア性窒素濃度(NH−N)の関係は、下式(1)のように示すことができる。 As shown in FIG. 3, the value obtained by subtracting the electrical conductivity of the storage tank 10 from the electrical conductivity of the methane fermentation tank 11 (hereinafter, referred to as “difference in electrical conductivity”) is the ammonia nitrogen concentration of the fermentation broth. There is a correlation, and the relationship between the difference in electrical conductivity and the ammoniacal nitrogen concentration (NH 4 -N) can be expressed by the following equation (1).

NH−N=220.3×電気伝導率の差分・・・(1) NH 4 −N = 220.3 × difference in electrical conductivity (1)

また、電気伝導率の差分と、アルカリ度の関係も、図3に示すように相関関係があり、下式(2)のように示すことができる。   Further, the relationship between the difference in electrical conductivity and the alkalinity has a correlation as shown in FIG. 3 and can be expressed as the following formula (2).

アルカリ度=786.45×電気伝導率の差分・・・(2)   Alkalinity = 786.45 × difference in electrical conductivity (2)

発酵液のアルカリ度が3000mg/L以上であれば、メタン発酵の過程で生成する炭酸イオンを中和できるので、発酵液のpHをほぼ中性にでき、メタン発酵性能を良好な状態にすることができる。   If the alkalinity of the fermented liquid is 3000 mg / L or more, carbonate ions generated in the process of methane fermentation can be neutralized, so the pH of the fermented liquid can be made almost neutral, and the methane fermentation performance should be in a good state. Can do.

アルカリ度を3000mg/L以上にするためには、上式(2)から、電気伝導率の差分が、3.8mS/cm以上に保つ必要がある。そして、1.5倍の余裕率をみて、およそ6.0mS/cm以下となったら、ポンプP2を作動して、メタン発酵槽11に供給する有機性廃棄物の窒素濃度を増加させることがより好ましい。   In order to set the alkalinity to 3000 mg / L or more, the difference in electrical conductivity needs to be kept at 3.8 mS / cm or more from the above formula (2). And when the margin rate of 1.5 times is seen, when it becomes about 6.0 mS / cm or less, it is more possible to increase the nitrogen concentration of the organic waste supplied to the methane fermentation tank 11 by operating the pump P2. preferable.

また、アンモニアによる、メタン菌などの嫌気性細菌の阻害は、主に非解離アンモニア(NH)のほうがアンモニウムイオン(NH )より強い。しかし、イオンクロマトグラフ法などでアンモニウムイオンを測定し、アンモニア性窒素として換算した濃度がある一定値を超えると阻害領域となることが知られている(K.H.Hansenら、Water Research,vol.32,No.1,p5−12(1998))。この文献によれば、アンモニアによる阻害は、アンモニア性窒素濃度が3000〜4000mg/Lで起こるとされている。 In addition, the inhibition of anaerobic bacteria such as methane bacteria by ammonia is mainly stronger in non-dissociated ammonia (NH 3 ) than in ammonium ions (NH 4 + ). However, it is known that an ammonium ion is measured by an ion chromatograph method or the like, and when the concentration converted to ammonia nitrogen exceeds a certain value, it becomes an inhibition region (KH Hansen et al., Water Research, vol. 32, No. 1, p5-12 (1998)). According to this document, inhibition by ammonia is assumed to occur at an ammoniacal nitrogen concentration of 3000 to 4000 mg / L.

したがって、上式(1)から得られるアンモニア性窒素濃度を上記の3000mg/L以下とすれば安定なメタン発酵が維持できると考えられるので、上式(1)から得られるアンモニア性窒素濃度3000mg/Lのときの電気伝導率である13.6mS/cmを基準として、ステップ3では、前記電気伝導率の差が13.6mS/cm以下となるように、ポンプP3を作動して稀釈水は供給することが好ましい。   Therefore, since it is considered that stable methane fermentation can be maintained if the ammoniacal nitrogen concentration obtained from the above formula (1) is 3000 mg / L or less, the ammoniacal nitrogen concentration obtained from the above formula (1) is 3000 mg / L. With reference to the electrical conductivity of 13.6 mS / cm at L, in Step 3, the dilution water is supplied by operating the pump P3 so that the difference in electrical conductivity is 13.6 mS / cm or less. It is preferable to do.

また上述の文献では、アンモニアによる阻害は、馴養を行っていない場合は、アンモニア性窒素濃度が、1500〜2000mg/Lでも生じるとされているので、プラントの立ち上げ時には、余裕を持った設定値である6.8〜9.1mS/cmを使用することが好ましい。   Moreover, in the above-mentioned document, when ammonia is not acclimatized, it is said that ammonia nitrogen concentration occurs even at 1500 to 2000 mg / L. Therefore, when the plant is started up, a set value with a margin is provided. It is preferable to use 6.8 to 9.1 mS / cm.

上記(1)、(2)の関係式は、処理に用いる有機性廃棄物に含まれる塩濃度によって変化することがあるため、都度処理対象を用いて計算式を見直すことで、対象を広げることが可能である。   Since the relational expressions (1) and (2) above may change depending on the salt concentration contained in the organic waste used in the treatment, the scope can be expanded by reviewing the calculation formula using the treatment target each time. Is possible.

なお、この実施形態では、窒素含有物供給槽12から窒素含有物を供給してメタン発酵槽11内のアンモニア性窒素濃度を増加させることで、アルカリ度を上昇させる構成としているが、貯留槽10に貯留する有機性廃棄物の濃度(好ましくは窒素濃度)を増加させる措置を行って、メタン発酵槽11内のアンモニア性窒素濃度を増加させて、アルカリ度を上昇させる構成にしてもよい。このような構成にする場合は、窒素含有物供給槽12は不要になる。   In addition, in this embodiment, it is set as the structure which raises alkalinity by supplying a nitrogen containing material from the nitrogen containing material supply tank 12 and increasing the ammonia nitrogen concentration in the methane fermentation tank 11, However, The storage tank 10 It may be configured to increase the alkalinity by increasing the ammonia nitrogen concentration in the methane fermentation tank 11 by taking measures to increase the concentration (preferably nitrogen concentration) of the organic waste stored in the tank. In the case of such a configuration, the nitrogen-containing material supply tank 12 becomes unnecessary.

貯留槽10内の有機性廃棄物の窒素濃度を増加させる方法としては、例えば、有機性廃棄物として下水汚泥を用いる場合においては、貯留槽10に貯留する下水汚泥の固形分濃度を高くする方法が一例として挙げられる。固形物濃度を高める方法として、重力による沈降を利用した濃縮や、浮上分離による濃縮、シックナーを用いる濃縮、遠心分離や多重円盤式の脱水機を用いる方法などが挙げられる。   As a method of increasing the nitrogen concentration of the organic waste in the storage tank 10, for example, when using sewage sludge as the organic waste, a method of increasing the solid content concentration of the sewage sludge stored in the storage tank 10. Is given as an example. Examples of the method for increasing the solid concentration include concentration using gravity sedimentation, concentration by flotation separation, concentration using a thickener, centrifugation, and a method using a multiple disk type dehydrator.

したがって、この場合においては、上記電気伝導率の差分が、所定値を下回ったら、貯留槽10に供給する有機性廃棄物の濃縮率などを増加して、貯留槽10に貯留する有機性廃棄物の固形分濃度(好ましくは窒素濃度)を増加させる処理を行うことが好ましい。   Therefore, in this case, when the difference in electrical conductivity is below a predetermined value, the organic waste stored in the storage tank 10 is increased by increasing the concentration rate of the organic waste supplied to the storage tank 10. It is preferable to carry out a treatment for increasing the solid content concentration (preferably the nitrogen concentration).

また、別の態様として、メタン発酵槽11へ投入する有機性廃棄物を可溶化し、窒素からアンモニアへの転換率を高くして、メタン発酵槽11内の発酵液のアンモニア性窒素濃度してアルカリ度を増加する方法が挙げられる。有機性廃棄物を可溶化することで、汚泥細胞などの細胞壁が破壊され、内部のタンパク質を溶出するので、窒素からアンモニアへの転換率が向上し、発酵液のアンモニア性窒素濃度を増加できる。   Moreover, as another aspect, the organic waste thrown into the methane fermentation tank 11 is solubilized, the conversion rate from nitrogen to ammonia is increased, and the ammoniacal nitrogen concentration of the fermentation liquid in the methane fermentation tank 11 is increased. A method for increasing the alkalinity is mentioned. By solubilizing organic waste, cell walls such as sludge cells are destroyed and internal proteins are eluted, so that the conversion rate from nitrogen to ammonia is improved and the concentration of ammoniacal nitrogen in the fermentation broth can be increased.

可溶化の方法としては、(a)超音波、ボールミル、キャビテーションなどを用いた物理的な破壊や、(b)酸、オゾンなどによる化学的な酸化、(c)アルカリによる加水分解、(d)生物を用いた処理などが挙げられる。   The solubilization methods include (a) physical destruction using ultrasonic waves, ball mill, cavitation, etc., (b) chemical oxidation with acid, ozone, etc., (c) hydrolysis with alkali, (d) Examples include treatment using living organisms.

したがって、この場合においては、上記電気伝導率の差分が、所定値を下回ったら、貯留槽10に貯留された有機性廃棄物を可溶化処理する、あるいは、可溶化率を増加させて、可溶化した有機性廃棄物をメタン発酵槽11に供給する処理を行うことが好ましい。   Therefore, in this case, when the difference in electrical conductivity is below a predetermined value, the organic waste stored in the storage tank 10 is solubilized, or the solubilization rate is increased and solubilized. It is preferable to perform the process which supplies the organic waste which was made to the methane fermenter 11.

(実施例1)
有機性廃棄物として、下水処理場の初沈汚泥を用いた。この初沈汚泥の有機性廃棄物濃度は、25g/Lで、窒素濃度は1.1g/Lであった。
メタン発酵槽11として、3.3mの容積を持つ高温発酵槽を用いた。起動時には、アルカリ度が不足すると予想し、アルカリ度2.0g/Lのアルカリ度が加算されるように、NaHCOを3.36g/Lの濃度になるように初沈汚泥にあらかじめ添加して滞留日数が5.2日(初沈汚泥投入量635L/日)になるように起動した。そして、メタン発酵処理開始から20日経過後からは、有機性廃棄物のみをメタン発酵槽11に供給してメタン発酵処理を行った。
メタン発酵処理開始から31日目に、発酵液のアルカリ度が低下し、発酵が悪化した指標となる揮発性有機酸の濃度が上昇したので、本発明の制御を用いて、有機物濃度77g/Lで、窒素濃度は4.0g/Lの給食残渣を水道水で2倍稀釈した生ごみスラリーの自動投入制御を実施し、電気伝導率の差分の値が6.0mS/cm以上となるようにしたころ、メタン発酵槽11内のアンモニア性窒素濃度が上昇し、アルカリ度が高くなって、発酵が安定化した。
安定時の初沈汚泥と生ごみスラリーの投入量比率は、8:2で推移した。(3.3mの容積を持つ高温発酵槽への有機性廃棄物の投入量の合計が635L/日になるように制御した。)それに伴い、高濃度になっていた揮発性有機酸の濃度の減少が見られ、安定な発酵の継続できた。
Example 1
The first settling sludge from a sewage treatment plant was used as organic waste. The organic waste concentration of this initial sedimentation sludge was 25 g / L, and the nitrogen concentration was 1.1 g / L.
As the methane fermentation tank 11, a high-temperature fermentation tank having a volume of 3.3 m 3 was used. At the time of start-up, the alkalinity is expected to be insufficient, and NaHCO 3 is added in advance to the initial settling sludge so as to have a concentration of 3.36 g / L so that an alkalinity of 2.0 g / L is added. The operation was started so that the staying days were 5.2 days (initial sludge input amount 635 L / day). Then, after 20 days from the start of the methane fermentation treatment, only organic waste was supplied to the methane fermentation tank 11 to perform the methane fermentation treatment.
On the 31st day from the start of the methane fermentation treatment, the alkalinity of the fermented liquid decreased and the concentration of the volatile organic acid, which is an indicator that the fermentation deteriorated, increased. Therefore, using the control of the present invention, the organic matter concentration was 77 g / L. Then, the automatic feed control of the garbage slurry in which the feeding concentration of 4.0g / L of the feeding residue was diluted twice with tap water was carried out so that the difference value of the electrical conductivity was 6.0 mS / cm or more. At that time, the ammoniacal nitrogen concentration in the methane fermentation tank 11 increased, the alkalinity increased, and the fermentation was stabilized.
The ratio of the amount of primary sludge and garbage slurry input at the time of stabilization remained at 8: 2. (Controlled so that the total amount of organic waste input to the high-temperature fermentor with a volume of 3.3 m 3 was 635 L / day.) Accordingly, the concentration of the volatile organic acid that had become high concentration A stable fermentation could be continued.

(実施例2)
有機性廃棄物として、下水処理場の初沈汚泥を用いた。この初沈汚泥の有機性廃棄物濃度は、25g/Lで、窒素濃度は1.1g/Lであった。
メタン発酵槽11として、3.3mの容積を持つ高温発酵槽を用いた。起動時には、アルカリ度が不足すると予想し、アルカリ度2.0g/Lのアルカリ度が加算されるように、NaHCOを3.36g/Lの濃度になるように初沈汚泥にあらかじめ添加して滞留日数が5.2日(初沈汚泥投入量635L/日)になるように起動した。そして、メタン発酵処理開始から19日経過後からは、有機性廃棄物のみをメタン発酵槽11に供給してメタン発酵処理を行った。
メタン発酵処理開始から32日目に、本発明の制御を用いて、有機物濃度45g/Lで、窒素濃度は3.3g/Lの余剰汚泥の自動投入制御を実施し、電気伝導率の差分の値が6.0mS/cm以上となるようにしたころ、メタン発酵槽11内のアンモニア性窒素濃度が上昇し、アルカリ度が高くなって、発酵が安定化した。
安定時の初沈汚泥と余剰汚泥の投入量比率は、7:3で推移した。(3.3mの容積を持つ高温発酵槽への有機性廃棄物の投入量の合計が635L/日になるように制御した。)それに伴い、高濃度になっていた揮発性有機酸の濃度の減少が見られて、安定な発酵を継続できた。
(Example 2)
The first settling sludge from a sewage treatment plant was used as organic waste. The organic waste concentration of this initial sedimentation sludge was 25 g / L, and the nitrogen concentration was 1.1 g / L.
As the methane fermentation tank 11, a high-temperature fermentation tank having a volume of 3.3 m 3 was used. At the time of start-up, the alkalinity is expected to be insufficient, and NaHCO 3 is added in advance to the initial settling sludge so as to have a concentration of 3.36 g / L so that an alkalinity of 2.0 g / L is added. The operation was started so that the staying days were 5.2 days (initial sludge input amount 635 L / day). Then, after 19 days from the start of the methane fermentation treatment, only organic waste was supplied to the methane fermentation tank 11 to perform the methane fermentation treatment.
On the 32nd day from the start of the methane fermentation treatment, by using the control of the present invention, an automatic input control of surplus sludge having an organic matter concentration of 45 g / L and a nitrogen concentration of 3.3 g / L was performed, and the difference in electrical conductivity was When the value was adjusted to 6.0 mS / cm or more, the ammoniacal nitrogen concentration in the methane fermentation tank 11 increased, the alkalinity increased, and the fermentation was stabilized.
The input ratio of primary sludge and surplus sludge during the stable period was 7: 3. (Controlled so that the total amount of organic waste input to the high-temperature fermentor with a volume of 3.3 m 3 was 635 L / day.) Accordingly, the concentration of the volatile organic acid that had become high concentration Was observed, and stable fermentation could be continued.

本発明に用いるメタン発酵処理装置の一実施形態を示す概略構成図である。It is a schematic block diagram which shows one Embodiment of the methane fermentation processing apparatus used for this invention. PLCでの演算処理の一例を示すフローチャート図である。It is a flowchart figure which shows an example of the arithmetic processing in PLC. 電気伝導率とアンモニア性窒素濃度及びアルカリ度の相関を求めたグラフである。It is the graph which calculated | required the correlation of electrical conductivity, ammonia nitrogen concentration, and alkalinity. 実施例1におけるメタン発酵液中の電気伝導率の差分とアンモニア性窒素濃度及びアルカリ度、揮発性有機酸濃度の経過時間変化を示したグラフである。It is the graph which showed the elapsed time change of the difference of the electrical conductivity in the methane fermentation liquid in Example 1, ammonia nitrogen concentration, alkalinity, and a volatile organic acid concentration. 実施例2におけるメタン発酵液中の電気伝導率の差分とアンモニア性窒素濃度及びアルカリ度、揮発性有機酸濃度の経過時間変化を示したグラフである。It is the graph which showed the elapsed time change of the difference of the electrical conductivity in the methane fermentation liquid in Example 2, ammonia nitrogen concentration, alkalinity, and a volatile organic acid concentration.

符号の説明Explanation of symbols

10:貯留槽
11:メタン発酵槽
12:窒素含有物供給槽
13:希釈水槽
30,31:電気伝導率計
L1〜L5:配管
P1〜P4:ポンプ
40:PLC
10: Storage tank 11: Methane fermentation tank 12: Nitrogen-containing material supply tank 13: Dilution water tank 30, 31: Electrical conductivity meter L1-L5: Pipes P1-P4: Pump 40: PLC

Claims (6)

有機性廃棄物をメタン発酵槽内に投入し、嫌気性微生物によりメタン発酵させるメタン発酵処理方法において、
前記有機性廃棄物の電気伝導率と、前記メタン発酵槽内の発酵液の電気伝導率とを測定し、
前記メタン発酵槽内の発酵液の電気伝導率と、前記有機性廃棄物の電気伝導率との差が所定値以下の場合には、前記発酵液中のアルカリ度を高める手段を施すことを特徴とするメタン発酵処理方法。
In a methane fermentation treatment method in which organic waste is put into a methane fermentation tank and methane fermentation is performed by anaerobic microorganisms.
Measure the electrical conductivity of the organic waste and the electrical conductivity of the fermentation broth in the methane fermentation tank,
When the difference between the electrical conductivity of the fermentation liquid in the methane fermentation tank and the electrical conductivity of the organic waste is a predetermined value or less, a means for increasing the alkalinity in the fermentation liquid is applied. A methane fermentation treatment method.
前記電気伝導率の差が4mS/cm以下となったときに、前記発酵液中のアルカリ度を高める手段を施す、請求項1記載のメタン発酵処理方法。   The methane fermentation treatment method according to claim 1, wherein when the difference in electrical conductivity is 4 mS / cm or less, means for increasing alkalinity in the fermentation broth is applied. 前記発酵液中のアルカリ度を高める手段が、前記メタン発酵槽に供給する有機性廃棄物の濃度を増加させることからなる、請求項1又は2に記載のメタン発酵処理方法。   The methane fermentation treatment method according to claim 1 or 2, wherein the means for increasing the alkalinity in the fermentation broth comprises increasing the concentration of organic waste supplied to the methane fermentation tank. 前記発酵液中のアルカリ度を高める手段が、前記メタン発酵槽に供給する有機性廃棄物に、窒素分を多く含む他の有機性廃棄物を加えて、窒素濃度を増加させることからなる、請求項1又は2に記載のメタン発酵処理方法。   The means for increasing the alkalinity in the fermentation liquid consists of adding another organic waste containing a large amount of nitrogen to the organic waste supplied to the methane fermenter to increase the nitrogen concentration. Item 3. The methane fermentation treatment method according to Item 1 or 2. 前記発酵液中のアルカリ度を高める手段が、前記有機性廃棄物を可溶化し、菌体中に含まれる窒素分を分解し易くして前記メタン発酵槽に供給することからなる、請求項1又は2記載のメタン発酵処理方法。   The means for increasing the alkalinity in the fermentation broth comprises solubilizing the organic waste and easily decomposing nitrogen contained in the bacterial cells to supply to the methane fermenter. Or the methane fermentation processing method of 2. 前記発酵液中のアルカリ度を高める手段が、前記有機性廃棄物にアンモニア化合物を添加することからなる、請求項1又は2に記載のメタン発酵処理方法。   The methane fermentation treatment method according to claim 1 or 2, wherein the means for increasing alkalinity in the fermentation broth comprises adding an ammonia compound to the organic waste.
JP2008065042A 2008-03-14 2008-03-14 Methane fermentation treatment method Active JP4834021B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008065042A JP4834021B2 (en) 2008-03-14 2008-03-14 Methane fermentation treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008065042A JP4834021B2 (en) 2008-03-14 2008-03-14 Methane fermentation treatment method

Publications (2)

Publication Number Publication Date
JP2009219960A true JP2009219960A (en) 2009-10-01
JP4834021B2 JP4834021B2 (en) 2011-12-07

Family

ID=41237348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008065042A Active JP4834021B2 (en) 2008-03-14 2008-03-14 Methane fermentation treatment method

Country Status (1)

Country Link
JP (1) JP4834021B2 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011118440A1 (en) * 2010-03-25 2011-09-29 株式会社神鋼環境ソリューション Anaerobic treatment apparatus and anaerobic treatment method
WO2011122056A1 (en) * 2010-03-29 2011-10-06 メタウォーター株式会社 Methane fermentation treatment method
US9203116B2 (en) 2006-12-12 2015-12-01 Commonwealth Scientific And Industrial Research Organisation Energy storage device
JP2016505357A (en) * 2012-11-16 2016-02-25 ブレイゴウ リミテッド Grain processing
US9401508B2 (en) 2009-08-27 2016-07-26 Commonwealth Scientific And Industrial Research Organisation Electrical storage device and electrode thereof
US9450232B2 (en) 2009-04-23 2016-09-20 Commonwealth Scientific And Industrial Research Organisation Process for producing negative plate for lead storage battery, and lead storage battery
US9508493B2 (en) 2009-08-27 2016-11-29 The Furukawa Battery Co., Ltd. Hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9524831B2 (en) 2009-08-27 2016-12-20 The Furukawa Battery Co., Ltd. Method for producing hybrid negative plate for lead-acid storage battery and lead-acid storage battery
JP2017000982A (en) * 2015-06-12 2017-01-05 水ing株式会社 Wastewater treatment system and method
US9666860B2 (en) 2007-03-20 2017-05-30 Commonwealth Scientific And Industrial Research Organisation Optimised energy storage device having capacitor material on lead based negative electrode

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003010893A (en) * 2001-07-04 2003-01-14 Mitsubishi Heavy Ind Ltd Control method for methane fermentation tank and control unit therefor
JP3630165B1 (en) * 2003-10-31 2005-03-16 富士電機ホールディングス株式会社 Methane fermentation treatment method
JP2005211712A (en) * 2004-01-27 2005-08-11 Fuji Electric Holdings Co Ltd Methane fermentation method
JP2005211713A (en) * 2004-01-27 2005-08-11 Fuji Electric Holdings Co Ltd Methane fermentation apparatus
JP2006212581A (en) * 2005-02-04 2006-08-17 Mitsubishi Heavy Ind Ltd Method for treating organic waste material
JP2007190489A (en) * 2006-01-19 2007-08-02 Kobelco Eco-Solutions Co Ltd Waste treatment method and waste treatment system
JP2008246359A (en) * 2007-03-30 2008-10-16 Kubota Corp Treating method and apparatus of organic waste
JP2009119328A (en) * 2007-11-13 2009-06-04 Fuji Electric Holdings Co Ltd Methane fermentation apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003010893A (en) * 2001-07-04 2003-01-14 Mitsubishi Heavy Ind Ltd Control method for methane fermentation tank and control unit therefor
JP3630165B1 (en) * 2003-10-31 2005-03-16 富士電機ホールディングス株式会社 Methane fermentation treatment method
JP2005152875A (en) * 2003-10-31 2005-06-16 Fuji Electric Holdings Co Ltd Methane fermentation treatment method
JP2005211712A (en) * 2004-01-27 2005-08-11 Fuji Electric Holdings Co Ltd Methane fermentation method
JP2005211713A (en) * 2004-01-27 2005-08-11 Fuji Electric Holdings Co Ltd Methane fermentation apparatus
JP2006212581A (en) * 2005-02-04 2006-08-17 Mitsubishi Heavy Ind Ltd Method for treating organic waste material
JP2007190489A (en) * 2006-01-19 2007-08-02 Kobelco Eco-Solutions Co Ltd Waste treatment method and waste treatment system
JP2008246359A (en) * 2007-03-30 2008-10-16 Kubota Corp Treating method and apparatus of organic waste
JP2009119328A (en) * 2007-11-13 2009-06-04 Fuji Electric Holdings Co Ltd Methane fermentation apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9203116B2 (en) 2006-12-12 2015-12-01 Commonwealth Scientific And Industrial Research Organisation Energy storage device
US9666860B2 (en) 2007-03-20 2017-05-30 Commonwealth Scientific And Industrial Research Organisation Optimised energy storage device having capacitor material on lead based negative electrode
US9450232B2 (en) 2009-04-23 2016-09-20 Commonwealth Scientific And Industrial Research Organisation Process for producing negative plate for lead storage battery, and lead storage battery
US9524831B2 (en) 2009-08-27 2016-12-20 The Furukawa Battery Co., Ltd. Method for producing hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9401508B2 (en) 2009-08-27 2016-07-26 Commonwealth Scientific And Industrial Research Organisation Electrical storage device and electrode thereof
US9508493B2 (en) 2009-08-27 2016-11-29 The Furukawa Battery Co., Ltd. Hybrid negative plate for lead-acid storage battery and lead-acid storage battery
JP2011200792A (en) * 2010-03-25 2011-10-13 Kobelco Eco-Solutions Co Ltd Apparatus and method for anaerobic treatment
WO2011118440A1 (en) * 2010-03-25 2011-09-29 株式会社神鋼環境ソリューション Anaerobic treatment apparatus and anaerobic treatment method
JP2011206639A (en) * 2010-03-29 2011-10-20 Univ Of Sumatera Utara Methane fermentation treatment method
WO2011122056A1 (en) * 2010-03-29 2011-10-06 メタウォーター株式会社 Methane fermentation treatment method
JP2016505357A (en) * 2012-11-16 2016-02-25 ブレイゴウ リミテッド Grain processing
US11193143B2 (en) 2012-11-16 2021-12-07 Blaygow Limited Grain processing
JP2017000982A (en) * 2015-06-12 2017-01-05 水ing株式会社 Wastewater treatment system and method

Also Published As

Publication number Publication date
JP4834021B2 (en) 2011-12-07

Similar Documents

Publication Publication Date Title
JP4834021B2 (en) Methane fermentation treatment method
Li et al. Achieving stable partial nitritation using endpoint pH control in an SBR treating landfill leachate
CN101805066B (en) Method and device for preventing scaling of reactor and simultaneously purifying biogas
Zeng et al. Sewage sludge digestion beyond biogas: Electrochemical pretreatment for biochemicals
Ndobeni et al. Organic removal rates and biogas production of an upflow anaerobic sludge blanket reactor treating sugarcane molasses
JP3772882B2 (en) Methane fermentation treatment method
Kerroum et al. Production of biogas from sludge waste and organic fraction of municipal solid waste
JP4576845B2 (en) Nitrogen-containing waste liquid treatment method
JP4784521B2 (en) Methane fermentation treatment method
JP4844608B2 (en) Methane fermentation equipment
JP2003136089A (en) Method for suppressing generation of hydrogen sulfide
JP4403812B2 (en) Methane fermentation treatment method
JP2004290921A (en) Methane fermentation method and system
JP3630165B1 (en) Methane fermentation treatment method
JP2009531159A (en) Excess sludge digestion method and equipment
JP2006055769A (en) Method and apparatus for anaerobic treatment of organic contaminant
EP2900608A1 (en) A method and an apparatus for simultaneous removal of thiosalt and nitrogen compounds in waste water
JP2003285031A (en) Apparatus for methane fermentation of organic waste
CN107473519A (en) A kind of biochemical processing method of ultrahigh concentration ammonia nitrogen waste water
WO2011122056A1 (en) Methane fermentation treatment method
JP4292999B2 (en) Methane fermentation equipment
JP5731209B2 (en) Method and apparatus for treating soap production waste liquid
JP6829956B2 (en) Anaerobic treatment method and anaerobic treatment equipment
JP5759839B2 (en) Anaerobic treatment equipment for organic wastewater
KR20130064173A (en) System for treating organic wastewater having high nitrogen content

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20101112

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110824

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110906

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110922

R150 Certificate of patent or registration of utility model

Ref document number: 4834021

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140930

Year of fee payment: 3

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

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250