JPH0479719B2 - - Google Patents
Info
- Publication number
- JPH0479719B2 JPH0479719B2 JP59168824A JP16882484A JPH0479719B2 JP H0479719 B2 JPH0479719 B2 JP H0479719B2 JP 59168824 A JP59168824 A JP 59168824A JP 16882484 A JP16882484 A JP 16882484A JP H0479719 B2 JPH0479719 B2 JP H0479719B2
- Authority
- JP
- Japan
- Prior art keywords
- digestion tank
- sludge
- digestion
- returned
- seed sludge
- 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
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 Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は嫌気性消化法を用いて有機性汚泥を処
理する嫌気性消化プロセスにおいて、第２消化槽
から第１消化槽への消化汚泥の返送量を制御する
消化槽の種汚泥返送制御装置に関するものであ
る。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for returning digested sludge from a second digestion tank to a first digestion tank in an anaerobic digestion process for treating organic sludge using an anaerobic digestion method. This invention relates to a seed sludge return control device for a digester that controls the amount.
有機性汚泥を処理する方法として、嫌気性消化
法は古くから用いられているが、メタンを主成分
とする可燃ガスが多量に得られること、好気性処
理に比べて曝気風量が小さくてよいことなどの理
由によつて、省資源の面から最近特に注目されて
来た。
Anaerobic digestion has been used for a long time as a method for treating organic sludge, but it produces a large amount of flammable gas whose main component is methane, and requires less aeration air volume than aerobic treatment. For these reasons, it has recently received particular attention from the perspective of resource conservation.
嫌気性処理は、有機性汚泥中の炭水化物、脂
肪、たんばく質を主として揮発性有機酸に分解す
る酸生成菌による液化反応と、揮発性有機酸を主
として炭酸ガスとメタンに分解するメタン菌によ
るガス化反応の２過程から構成される。 Anaerobic treatment involves a liquefaction reaction by acid-producing bacteria that mainly decomposes carbohydrates, fats, and proteins in organic sludge into volatile organic acids, and a liquefaction reaction by methane bacteria that decomposes volatile organic acids mainly into carbon dioxide and methane. It consists of two processes: gasification reaction.
第２図に嫌気性消化プロセスの基本的な構成を
示す。 Figure 2 shows the basic configuration of the anaerobic digestion process.
第２図において、有機性汚泥は管路１を通つて
第一消化槽２に間欠的に投入され、第一消化槽２
は有機性汚泥を滞留させ、液化およびガス化反応
によつて最終的にメタン、炭酸ガスなどに分解す
る。 In FIG. 2, organic sludge is intermittently introduced into a first digestion tank 2 through a pipe 1.
The organic sludge is retained and finally decomposed into methane, carbon dioxide, etc. through liquefaction and gasification reactions.
第１消化槽２は細菌の活性を維持するために、
30〜40℃程度に加温される。 In order to maintain the activity of bacteria, the first digestion tank 2 is
It is heated to about 30-40℃.
また投入された有機性汚泥と細菌とを均一に混
合させるために、発生した消化ガスをブロワ９に
よつて循環させ、第１消化槽内を撹拌している。 Further, in order to uniformly mix the introduced organic sludge and bacteria, the generated digestion gas is circulated by a blower 9 to stir the inside of the first digestion tank.
第１消化槽での消化処理が終了した消化汚泥は
移送管３を通つて第２消化槽４に送られて沈降濃
縮され、分離された上澄液は管路５を通つて河川
などに放流されるか、水処理プロセスへ返送さ
れ、沈降濃縮された消化汚泥は管路６を通つて次
の汚泥処理工程へ送られる。 The digested sludge that has been digested in the first digestion tank is sent to the second digestion tank 4 through the transfer pipe 3 where it is sedimented and concentrated, and the separated supernatant liquid is discharged into rivers etc. through the pipe 5. The digested sludge, which has been sedimented and concentrated, is sent to the next sludge treatment step through pipe 6.
第１消化槽２および第２消化槽４で発生した消
化ガスは、最終的に管路７を通つてガスタンク８
に貯留され、燃料その他の用途に用いられる。 The digestion gas generated in the first digestion tank 2 and the second digestion tank 4 finally passes through the pipe line 7 to the gas tank 8.
is stored and used for fuel and other purposes.
このような嫌気性消化プロセスでは、消化効率
を向上させるために、第２消化槽から第１消化槽
へ種汚泥の返送が行われることが多い。 In such an anaerobic digestion process, seed sludge is often returned from the second digestion tank to the first digestion tank in order to improve digestion efficiency.
これは第２消化槽で沈降濃縮された消化汚泥は
酸生成菌やメタン菌の濃度が高いので、これを第
１消化槽へ返送することによつて第１消化槽の菌
濃度が増大するからである。 This is because the digested sludge sedimented and concentrated in the second digestion tank has a high concentration of acid-producing bacteria and methane bacteria, so returning this to the first digestion tank increases the bacteria concentration in the first digestion tank. It is.
種汚泥返送量の制御としては、比率一定制御や
固形物濃度一定制御などの方法が用いられてい
る。 Methods such as constant ratio control and constant solids concentration control are used to control the amount of seed sludge returned.
比率一定制御は、投入される有機性汚泥量と返
送される種汚泥との比率を設定値に応じて一定に
制御するものであるが、第２消化槽の沈降濃縮汚
泥の濃度が低下すると第１消化槽の菌濃度も低下
し、消化効率がかえつて低下するという問題があ
る。 Constant ratio control is to control the ratio between the amount of organic sludge input and the seed sludge returned to be constant according to a set value, but when the concentration of settled thickened sludge in the second digestion tank decreases, There is a problem in that the bacterial concentration in the 1-digestion tank also decreases, and the digestion efficiency actually decreases.
一方、固形物濃度一定制御は、第１消化槽内の
固形物濃度が設定値に応じて一定となるように種
汚泥返送量を制御するものであるが、投入される
有機物の固形物濃度が溶存物濃度に比して高いと
きは、種汚泥返送量が低下して投入有機物に見合
う菌濃度を保持できず、消化効率が低下するとい
う問題がある。 On the other hand, constant solids concentration control is to control the amount of seed sludge returned so that the solids concentration in the first digestion tank is constant according to a set value, but the solids concentration of the input organic matter is When the concentration is high compared to the dissolved matter concentration, the amount of seed sludge returned decreases, making it impossible to maintain a bacteria concentration commensurate with the input organic matter, resulting in a problem that the digestion efficiency decreases.
本発明は、投入される有機性汚泥の固形物濃度
の如何にかかわらず、第１消化槽内の菌濃度を適
正に保持できる消化槽の種汚泥返送制御装置を提
供することを目的としている。
SUMMARY OF THE INVENTION An object of the present invention is to provide a seed sludge return control device for a digestion tank that can maintain an appropriate bacterial concentration in a first digestion tank regardless of the solids concentration of the organic sludge introduced.
本発明は、嫌気性消化法を用いて有機性汚泥を
処理する嫌気性消化プロセスの第２消化槽から第
１消化槽へ返送される種汚泥量を制御する消化槽
の種汚泥返送制御装置において、第１消化槽へ投
入される有機性汚泥流量および第２消化槽から第
１消化槽への種汚泥返送流量を測定し、種汚泥返
送量を有機性汚泥投入量に対応して制御する第１
制御器と、第１消化槽内の固形物濃度および返送
種汚泥の固形物濃度を測定し第１消化槽内の固形
物濃度が返送種汚泥の固形物濃度より高いとき種
汚泥返送を停止させる第２制御器を設け、第１消
化槽に投入される有機性汚泥の流量や固形物濃度
の変動、または第２消化槽で沈殿濃縮される種汚
泥の固形物濃度の低下にかかわらず第１消化槽の
消化反応が安定に継続できるように種汚泥の返送
量を制御したものである。
The present invention provides a seed sludge return control device for a digestion tank that controls the amount of seed sludge returned from a second digestion tank to a first digestion tank in an anaerobic digestion process for treating organic sludge using an anaerobic digestion method. , the flow rate of organic sludge input into the first digestion tank and the flow rate of seed sludge returned from the second digestion tank to the first digestion tank are measured, and the amount of seed sludge returned is controlled in accordance with the amount of organic sludge input. 1
A controller, which measures the solids concentration in the first digestion tank and the solids concentration in the returned seed sludge, and stops the seed sludge return when the solids concentration in the first digestion tank is higher than the solids concentration in the returned seed sludge. A second controller is provided so that the first The amount of seed sludge returned is controlled so that the digestion reaction in the digestion tank can continue stably.
本発明の一実施例を第１図に示す。 An embodiment of the present invention is shown in FIG.
第１図において、第１消化槽２に投入される有
機性汚泥の流量qiは管路１に設けた流量計１０で
測定されて演算器１６に入力され、下記演算によ
つて種汚泥返送量目標値Qr*が決定される。 In FIG. 1, the flow rate qi of organic sludge introduced into the first digestion tank 2 is measured by a flow meter 10 installed in the pipe line 1 and inputted to the calculator 16, and the amount of seed sludge returned is determined by the following calculation. Target value Qr * is determined.
Qr*＝Ｋ・Q1
ここでQ1は投入有機性汚泥量、Ｋは定数であ
る。 Qr * = K・Q 1 Here, Q 1 is the amount of input organic sludge, and K is a constant.
一方第２消化槽４で沈降濃縮した消化汚泥は返
送ポンプ１３を介して返送管路１１を通つて種汚
泥として第１消化槽２に返送され、その返送流量
qrおよび固形物濃度Drはそれぞれ流量計１２お
よび濃度計１４で測定される。 On the other hand, the digested sludge sedimented and concentrated in the second digestion tank 4 is returned to the first digestion tank 2 as seed sludge via the return pump 13 and the return pipe line 11, and the return flow rate is
qr and solids concentration Dr are measured by a flowmeter 12 and a concentration meter 14, respectively.
上記返送流量目標値Qr*および返送流量測定値
qrは第１演算器１７に入力され、種汚泥返送量
Qrが目標値Qr*になるように返送ポンプ１３を運
転停止させる制御信号C1を出力する。 The above return flow rate target value Qr * and return flow rate measurement value
qr is input to the first computing unit 17, and the amount of seed sludge returned is
A control signal C1 is output to stop the return pump 13 so that Qr becomes the target value Qr * .
一方濃度計１５で測定した第１消化槽２内の固
形物濃度D1と上記返送汚泥の固形物濃度Drは比
較器１８で比較され、その出力は第２制御器１９
に入力され、D1＞Drになると返送ポンプを停止
させる制御信号C2を出力する。 On the other hand, the solids concentration D 1 in the first digestion tank 2 measured by the densitometer 15 and the solids concentration Dr of the returned sludge are compared by a comparator 18, and the output thereof is sent to the second controller 19.
is input, and when D 1 > Dr, a control signal C 2 is output to stop the return pump.
上記制御信号C1およびC2は返送ポンプ１３の
制御回路に入力され、返送ポンプ１３の運転停止
を制御する。 The control signals C 1 and C 2 are input to the control circuit of the return pump 13 and control the operation stop of the return pump 13 .
これによつて種汚泥の返送量が第１消化槽へ投
入される有機物汚泥量に比例して制御されると共
に、第１消化槽内の固形物濃度が返送される種汚
泥の固形物濃度より大きくなると種汚泥の返送が
停止され、第１消化槽内の菌濃度が適正な値に保
持される。また、本発明においては、第１消化槽
内固形物濃度と返送汚泥固形物濃度の比較のみで
よいから測定値の絶対値は必要ではなく、相対値
でもよく、水質計測器のメンテナンスの時間、労
力を大幅に減少させることができる。 As a result, the amount of returned seed sludge is controlled in proportion to the amount of organic sludge input into the first digestion tank, and the solids concentration in the first digestion tank is lower than the solids concentration of the returned seed sludge. When the size of the bacteria increases, the return of the seed sludge is stopped, and the bacteria concentration in the first digestion tank is maintained at an appropriate value. In addition, in the present invention, since it is only necessary to compare the solids concentration in the first digestion tank and the returned sludge solids concentration, the absolute value of the measured value is not necessary, and a relative value may be used. Labor effort can be significantly reduced.
以上説明したように、本発明によれば投入され
る有機性汚泥量に見合つた量の種汚泥が返送され
るので、第１消化槽内の菌濃度が適正に保持さ
れ、さらに第２消化槽の消化汚泥の沈降濃縮が悪
化した異常状態には低濃度の種汚泥の返送が停止
されるので、第１消化槽の菌濃度の低下が防止さ
れ、これによつて常に安定した消化処理が可能と
なる。また、本発明によれば、第１消化槽内固形
物濃度と返送汚泥固形物濃度の比較のみでよいか
ら測定値の絶対値は必要ではなく、相対値で十分
な種汚泥返送制御が可能となるので、濃度計のメ
ンテナンスの時間、労力を大幅に減少させること
ができる。
As explained above, according to the present invention, an amount of seed sludge commensurate with the amount of organic sludge input is returned, so that the bacteria concentration in the first digestion tank is maintained appropriately, and further, the bacteria concentration in the second digestion tank is maintained. In the event of an abnormal situation in which sedimentation and concentration of the digested sludge deteriorates, the return of low-concentration seed sludge is stopped, preventing a decrease in the bacterial concentration in the first digestion tank, thereby enabling stable digestion treatment at all times. becomes. Furthermore, according to the present invention, it is only necessary to compare the solids concentration in the first digestion tank and the returned sludge solids concentration, so the absolute value of the measured value is not necessary, and it is possible to perform sufficient seed sludge return control with relative values. Therefore, the time and labor required for maintenance of the concentration meter can be significantly reduced.
第１図は本発明の一実施例を示す制御系統図、
第２図は消化プロセスの一般的な構成を示す系統
図である。
２…第１消化槽、４…第２消化槽、１０，１２
…流量計、１３…返送ポンプ、１４，１５…濃度
計、１６…演算器、１７，１９…制御器、１８…
比較器。
FIG. 1 is a control system diagram showing an embodiment of the present invention;
FIG. 2 is a system diagram showing the general structure of the digestion process. 2...First digestion tank, 4...Second digestion tank, 10, 12
...Flowmeter, 13...Return pump, 14, 15...Concentration meter, 16...Arithmetic unit, 17, 19...Controller, 18...
Comparator.
Claims (1)
嫌気性消化プロセスの第２消化槽から第１消化槽
へ返送される種汚泥量を制御する消化槽の種汚泥
返送制御装置において、第１消化槽へ投入される
有機性汚泥流量および第２消化槽から第１消化槽
への種汚泥返送流量を測定し種汚泥返送量を有機
性汚泥投入量に対応して制御する第１制御器と第
１消化槽内の固形物濃度および返送種汚泥の固形
物濃度を測定し第１消化槽内の固形物濃度が返送
種汚泥の固形物濃度より高いとき種汚泥返送を停
止させる第２制御器を備えたことを特徴とする消
化槽の種汚泥返送制御装置。1. In a seed sludge return control device for a digestion tank that controls the amount of seed sludge returned from a second digestion tank to a first digestion tank in an anaerobic digestion process for treating organic sludge using an anaerobic digestion method, a first a first controller that measures the flow rate of organic sludge introduced into the digestion tank and the flow rate of seed sludge returned from the second digestion tank to the first digestion tank, and controls the amount of seed sludge returned in accordance with the amount of organic sludge input; A second controller that measures the solids concentration in the first digestion tank and the solids concentration in the return seed sludge and stops the seed sludge return when the solids concentration in the first digestion tank is higher than the solids concentration in the return seed sludge. A seed sludge return control device for a digestion tank, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59168824A JPS6150698A (en) | 1984-08-14 | 1984-08-14 | Seed sludge return control apparatus of digestion tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59168824A JPS6150698A (en) | 1984-08-14 | 1984-08-14 | Seed sludge return control apparatus of digestion tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6150698A JPS6150698A (en) | 1986-03-12 |
| JPH0479719B2 true JPH0479719B2 (en) | 1992-12-16 |
Family
ID=15875192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59168824A Granted JPS6150698A (en) | 1984-08-14 | 1984-08-14 | Seed sludge return control apparatus of digestion tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6150698A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02277600A (en) * | 1989-04-18 | 1990-11-14 | Kirin Brewery Co Ltd | Method for controlling load change of anaerobic waste water treating tank |
| JP4991832B2 (en) * | 2009-12-09 | 2012-08-01 | メタウォーター株式会社 | Methane fermentation method and methane fermentation apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594693A (en) * | 1979-01-12 | 1980-07-18 | Hitachi Ltd | Device for controlling concentration of floating substances in digestion vessel |
-
1984
- 1984-08-14 JP JP59168824A patent/JPS6150698A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6150698A (en) | 1986-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |