JPH08155498A - Anaerobic digestion method for sludge containing organic substance - Google Patents
Anaerobic digestion method for sludge containing organic substanceInfo
- Publication number
- JPH08155498A JPH08155498A JP6323824A JP32382494A JPH08155498A JP H08155498 A JPH08155498 A JP H08155498A JP 6323824 A JP6323824 A JP 6323824A JP 32382494 A JP32382494 A JP 32382494A JP H08155498 A JPH08155498 A JP H08155498A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- anaerobic digestion
- anaerobic
- digestion
- tank
- 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.)
- Pending
Links
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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，汚泥の有機物を生物学
的に嫌気性消化処理することに当り，特に，有機物分解
率の高い汚泥の嫌気性消化方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to biologically anaerobic digestion of organic matter in sludge, and more particularly to a method for anaerobic digestion of sludge having a high decomposition rate of organic matter.
【０００２】[0002]
【従来の技術】汚泥中の有機物を生物学的に嫌気性消化
処理するためには，従来，活性汚泥処理場より発生する
初沈汚泥や余剰汚泥を濃縮した後，生物学的に嫌気性消
化処理し，さらに濃縮，沈降を行い濃縮された消化汚泥
は脱水，焼却の工程を経て，埋め立てなどの処分されて
いる。沈降分離された上澄水は，既存の水処理施設へ返
流され新たに処理されている。このような処理工程で問
題とされることは，有機物分解率が約５０％程度であ
り，十分な消化処理が行われていない。また上澄水は，
高濃度の水質であるために既存の水処理施設へ返流され
たとき，負荷の増大が懸念される。また，汚泥消化槽の
加温や脱水ケーキの焼却に多大のエネルギーを消費する
ため，より高効率の汚泥減量方法が望まれている。2. Description of the Related Art Conventionally, in order to biologically anaerobicly digest organic matter in sludge, the first settling sludge and surplus sludge generated from an activated sludge treatment plant have been concentrated before biologically anaerobic digestion. The digested sludge that has been treated, further concentrated and settled, is then dehydrated and incinerated before being disposed of in landfills. The supernatant water separated by settling is returned to the existing water treatment facility for new treatment. The problem with such a treatment process is that the decomposition rate of organic matter is about 50%, and sufficient digestion treatment is not performed. The clear water is
Due to the high concentration of water quality, there is concern that the load will increase when it is returned to the existing water treatment facility. In addition, since a large amount of energy is consumed for heating the sludge digestion tank and incinerating the dehydrated cake, a more efficient sludge reduction method is desired.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は，前記
の従来技術の欠点を解消し，既存の消化設備を変えるこ
となく汚泥の有機物を効率良く減量化し，経済的な汚泥
の嫌気性消化システムを提供することにある。The object of the present invention is to solve the above-mentioned drawbacks of the prior art, efficiently reduce the amount of organic matter in sludge without changing existing digestion equipment, and economically anaerobicly digest sludge. To provide a system.
【０００４】[0004]
【課題を解決するための手段】この発明は，従来の消化
日数を変えず，汚泥の引き抜き量を小さくして汚泥の嫌
気性消化槽内の嫌気性消化菌を長時間保持することで，
汚泥の有機物分解を向上させ，さらに生成する余剰の消
化汚泥に無酸素ガスを定期的に吹き込みガス層内をガス
置換させ，汚泥の有機物分解を向上させるものである。SUMMARY OF THE INVENTION The present invention, by keeping the digestion days unchanged and keeping the anaerobic digestive bacteria in the anaerobic digestion tank of sludge for a long time by reducing the amount of sludge drawn out,
This is to improve the decomposition of organic matter in sludge by further blowing oxygen-free gas into the excess digested sludge that is generated to periodically replace the gas in the gas layer.
【０００５】[0005]
【実 施 例】実施例に基づいて詳述するが，本発明は
これに限定されるものではない。図１は本発明の実施例
を示す説明図，図２は従来の消化システムの説明図であ
る。[Examples] Although detailed description will be given based on examples, the present invention is not limited thereto. FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional digestion system.
【０００６】図１は第一次嫌気性消化槽１，限外ろ過膜
装置３，汚泥循環ポンプ４，および第二次嫌気性消化槽
２より概ね構成されている。嫌気性消化層１には汚泥流
入管２１が設けられ，嫌気性消化槽内の消化汚泥は汚泥
循環ポンプ４によって限外ろ過膜装置３に移送される。
ここで消化汚泥はろ過され，濃縮された消化汚泥と透過
水に分離される。濃縮された消化汚泥は第一次嫌気性消
化槽１に返送される。限外ろ過膜装置３は，分離する手
段として膜面を吸引または加圧する方法が行われてお
り，吸引する場合，透過水吸引ポンプ５によって約３５
０Tor で吸引され，透過水２３は既存の活性汚泥処理場
へ返水される。加圧する場合，前記透過水吸引ポンプ５
は省略してもよく，この場合は０．５〜２．０kgf・cm-2
で操作する。いずれの方法も汚泥循環ポンプ４の流量を
増やし限外ろ過膜装置３の膜面流速を１〜３m/s に上
げ，膜面の目づまりを防止する必要がある。嫌気性消化
槽１の消化汚泥濃度を一定に保持するために，汚泥引き
抜きポンプ６で定期的に排出する。排出する消化汚泥量
は，嫌気性消化槽容量に対して１日当り1/100 〜1/200
の引き抜き比で運転するのが望ましい。嫌気性消化槽１
の消化汚泥濃度は均一にするように攪はん機が設けられ
ている。次に第一次嫌気性消化槽で発生する余剰の消化
汚泥を第二次嫌気性消化槽に導入し，一日一回，無酸素
ガスを吹き込み，汚泥上層部のガス層を置換する。無酸
素ガスとして窒素ガス８０％と炭酸ガス２０％混合ガス
を用いた。消化された汚泥２２は脱水機へ導入される。FIG. 1 generally comprises a primary anaerobic digestion tank 1, an ultrafiltration membrane device 3, a sludge circulation pump 4, and a secondary anaerobic digestion tank 2. A sludge inflow pipe 21 is provided in the anaerobic digestion layer 1, and the digested sludge in the anaerobic digestion tank is transferred to the ultrafiltration membrane device 3 by the sludge circulation pump 4.
Here, the digested sludge is filtered and separated into concentrated digested sludge and permeate. The concentrated digested sludge is returned to the primary anaerobic digestion tank 1. The ultrafiltration membrane device 3 employs a method of sucking or pressurizing the membrane surface as a separating means.
It is sucked at 0 Torr and the permeated water 23 is returned to the existing activated sludge treatment plant. When pressurizing, the permeated water suction pump 5
May be omitted, in this case 0.5 to 2.0 kgf · cm -2
Operate with. In either method, it is necessary to increase the flow rate of the sludge circulation pump 4 and increase the membrane surface velocity of the ultrafiltration membrane device 3 to 1 to 3 m / s to prevent clogging of the membrane surface. In order to keep the digested sludge concentration in the anaerobic digestion tank 1 constant, the sludge extraction pump 6 periodically discharges it. The amount of digested sludge to be discharged is 1/100 to 1/200 of the anaerobic digester tank capacity per day.
It is desirable to operate at a pulling ratio of. Anaerobic digester 1
A stirrer is installed to make the digested sludge concentration of the plant uniform. Next, the excess digested sludge generated in the primary anaerobic digester is introduced into the secondary anaerobic digester, and oxygen-free gas is blown into it once a day to replace the gas layer in the upper part of the sludge. A mixed gas of 80% nitrogen gas and 20% carbon dioxide gas was used as the oxygen-free gas. The digested sludge 22 is introduced into the dehydrator.
【０００７】本発明では，１００リットル容量の嫌気性
消化槽１に限外ろ過膜装置３の限外ろ過膜として分画分
子量７５万のポリスルホン膜を接続し，投入汚泥濃度
１．８％の下水活性汚泥処理場の余剰汚泥を用いた。第
一次及び第二次の嫌気性消化槽ともに消化日数を１５日
とし，温度および汚泥引き抜き比は各々３５℃，1/100
の条件で運転した。図３に本発明法の汚泥引き抜き比に
対する有機物分解率の結果を示す。第一次及び第二次の
嫌気性消化槽における全消化日数３０日のときの全有機
物分解率（図中，Ａ線を示す）と第二次嫌気性消化槽の
ガス層を窒素ガスに置換したときの全有機物分解率（図
中，Ｂ線を示す）を示す。従来の嫌気性消化の有機物分
解率が約５０％に比べて明らかに消化の効率が良い。ま
た汚泥引き抜き比は1/100 より少なくしても変化なく，
ほぼ７５％で平衡であった。これはメタン生成細菌，水
素資化性細菌，硫酸還元菌などの嫌気性微生物が多種多
様な共生系で存在している中で，平衡状態であることが
考えられる。消化槽内のガス層には，メタンガス，炭酸
ガスが主成分であるが，微量の窒素，水素などを含有し
ており，このガス分圧を変えることで嫌気性微生物の活
性に変化を生じたものと考えられる。In the present invention, a polysulfone membrane having a molecular weight cut-off of 750,000 is connected as an ultrafiltration membrane of the ultrafiltration membrane device 3 to an anaerobic digestion tank 1 having a capacity of 100 liters, and sewage having a sludge concentration of 1.8% is supplied. Excess sludge from the activated sludge treatment plant was used. Both primary and secondary anaerobic digesters had a digestion period of 15 days, and the temperature and sludge extraction ratio were 35 ° C and 1/100, respectively.
I drove under the conditions. FIG. 3 shows the results of the decomposition rate of organic matter with respect to the sludge extraction ratio of the method of the present invention. The total organic matter decomposition rate (indicated by line A in the figure) and the gas layer in the secondary anaerobic digester at 30 days in the primary and secondary anaerobic digester were replaced with nitrogen gas. The total organic matter decomposition rate (indicated by line B in the figure) is shown. The digestion efficiency is obviously better than the conventional anaerobic digestion rate of about 50% of organic matter. Also, if the sludge extraction ratio is less than 1/100, it does not change,
Equilibrium was approximately 75%. This is considered to be an equilibrium state when anaerobic microorganisms such as methanogenic bacteria, hydrogen-utilizing bacteria, and sulfate-reducing bacteria exist in a wide variety of symbiotic systems. Methane gas and carbon dioxide gas are the main components of the gas layer in the digestion tank, but they contain trace amounts of nitrogen and hydrogen, and the activity of anaerobic microorganisms was changed by changing the partial pressure of these gases. It is considered to be a thing.
【０００８】本実験では，引き抜き量を限定して高効率
の汚泥消化を目指した運転方法を詳述してあるが，この
範囲に限定されるものでなく引き抜き量を1/100 以下で
運転しても良い。この場合でも，有機物分解率は低下す
るものの従来以上の成果が期待できる。In this experiment, the operating method aiming at highly efficient sludge digestion by limiting the withdrawal amount was described in detail. However, the operating amount is not limited to this range, and the withdrawing amount is 1/100 or less. May be. Even in this case, although the decomposition rate of organic matter will decrease, more results than before can be expected.
【０００９】[0009]
【発明の効果】本発明によれば，新たに消化設備を建設
することなく，既存の汚泥消化設備に限外ろ過膜を付加
し，ガス置換するだけで従来以上の汚泥減量化が可能と
なり，脱水設備に対する負荷が軽減される。しかも，有
機物の大部分がメタンガス化されるために熱源の確保が
容易である。EFFECTS OF THE INVENTION According to the present invention, it is possible to reduce the amount of sludge more than before by simply adding an ultrafiltration membrane to the existing sludge digestion facility and replacing the gas without constructing a new digestion facility. The load on the dehydration equipment is reduced. Moreover, it is easy to secure a heat source because most of the organic substances are converted to methane gas.
【図１】本発明の実施例を説明するフロー図。FIG. 1 is a flowchart illustrating an embodiment of the present invention.
【図２】従来法を説明するフロー図。FIG. 2 is a flowchart illustrating a conventional method.
【図３】本発明法の有機物分解率を示した図。FIG. 3 is a graph showing the decomposition rate of organic substances according to the method of the present invention.
１ 第一次嫌気性消化槽 ２ 第二次嫌気性消化槽 ３ 限外ろ過膜装置 ４ 汚泥循環ポンプ ５ 透過水吸引ポンプ ６ 消化汚泥引き抜きポンプ ７ 無酸素ガス吹き込み機 1 Primary Anaerobic Digestion Tank 2 Secondary Anaerobic Digestion Tank 3 Ultrafiltration Membrane Device 4 Sludge Circulation Pump 5 Permeate Suction Pump 6 Digestion Sludge Extraction Pump 7 Anoxic Gas Blowing Machine
Claims (1)
って消化する第一次嫌気性消化槽と，消化，濃縮および
沈降を行う第二次嫌気性消化槽からなる汚泥の嫌気性消
化方法において，前記第一次嫌気性消化槽に限外ろ過膜
装置を設け，消化汚泥を濃縮，ろ過する工程と，第一次
嫌気性消化槽から排出される消化汚泥を第二次嫌気性消
化槽に流入し，無酸素ガスを吹き込みガス置換する工程
を有することを特徴とする有機物含有汚泥の嫌気性消化
方法。1. A method for anaerobic digestion of sludge comprising a primary anaerobic digester for digesting organic matter-containing sludge with biological anaerobic bacteria and a secondary anaerobic digester for digestion, concentration and sedimentation. , A step of providing an ultrafiltration membrane device in the primary anaerobic digestion tank to concentrate and filter the digested sludge, and the digested sludge discharged from the primary anaerobic digestion tank to the secondary anaerobic digestion tank An anaerobic digestion method of organic matter-containing sludge, which comprises a step of flowing in and blowing oxygen-free gas to replace the gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6323824A JPH08155498A (en) | 1994-11-30 | 1994-11-30 | Anaerobic digestion method for sludge containing organic substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6323824A JPH08155498A (en) | 1994-11-30 | 1994-11-30 | Anaerobic digestion method for sludge containing organic substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08155498A true JPH08155498A (en) | 1996-06-18 |
Family
ID=18159013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6323824A Pending JPH08155498A (en) | 1994-11-30 | 1994-11-30 | Anaerobic digestion method for sludge containing organic substance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08155498A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10781119B2 (en) | 2013-02-22 | 2020-09-22 | Bl Technologies, Inc. | Membrane assembly for supporting a biofilm |
| US11850554B2 (en) | 2014-03-20 | 2023-12-26 | Bl Technologies, Inc. | Wastewater treatment with primary treatment and MBR or MABR-IFAS reactor |
-
1994
- 1994-11-30 JP JP6323824A patent/JPH08155498A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10781119B2 (en) | 2013-02-22 | 2020-09-22 | Bl Technologies, Inc. | Membrane assembly for supporting a biofilm |
| US11724947B2 (en) | 2013-02-22 | 2023-08-15 | Bl Technologies, Inc. | Membrane assembly for supporting a biofilm |
| US11850554B2 (en) | 2014-03-20 | 2023-12-26 | Bl Technologies, Inc. | Wastewater treatment with primary treatment and MBR or MABR-IFAS reactor |
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