JPS60197300A - Method and apparatus for dehydrating sludge - Google Patents
Method and apparatus for dehydrating sludgeInfo
- Publication number
- JPS60197300A JPS60197300A JP59052390A JP5239084A JPS60197300A JP S60197300 A JPS60197300 A JP S60197300A JP 59052390 A JP59052390 A JP 59052390A JP 5239084 A JP5239084 A JP 5239084A JP S60197300 A JPS60197300 A JP S60197300A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- turbidity
- flocculant
- dewatering
- gravity
- 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
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、下水汚泥等の脱水方法及び脱水装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for dewatering sewage sludge and the like.
下水汚泥の脱水設備では、汚泥濃度、強熱減量等の汚泥
特性が変化するため、これらの特性に応じて凝集剤注入
量を適正な値に変更する必要がある。In sewage sludge dewatering equipment, sludge properties such as sludge concentration and loss on ignition change, so it is necessary to change the amount of flocculant injection to an appropriate value according to these properties.
しかｌ−従来は、この操作を人為的に行なってｂたため
、頻繁な変更はむずかしく、適切な調節がなされなかっ
た。このため凝集剤せが不足して、充分な脱水が行表わ
れず、汚泥ケーキ含水率が上昇したり、またこれを防ぐ
ための過剰量の凝集剤を注入して薬剤の浪費を招くなど
の問題があった。However, in the past, this operation was performed manually, making it difficult to make frequent changes and not making appropriate adjustments. As a result, there is a shortage of flocculant, which prevents sufficient dewatering, resulting in an increase in the water content of the sludge cake, and injecting an excessive amount of flocculant to prevent this, resulting in waste of chemicals. There was a problem.
これを解決するため、汚泥濃度を測定し、この測定値か
ら汚泥供給量、凝集剤注入量を操作する方法が提案され
ている（特公昭５７−３１９３２号。In order to solve this problem, a method has been proposed in which the sludge concentration is measured and the sludge supply amount and flocculant injection amount are controlled based on the measured value (Japanese Patent Publication No. 57-31932).
「脱水装置」）。しかし、下水汚泥は一般に最初の沈澱
池からの初沈汚泥と最終沈澱池からの余剰汚泥を混合濃
縮槽で濃縮したものでおシ、その比率が変動することに
よシ、必要な凝集剤注入量も変化する。従ってこの方法
の如く、汚泥濃度を測定しただけでは、適正な凝集剤注
入量制御を行なえない場合がある。"Dehydration equipment"). However, sewage sludge is generally made by concentrating initial sludge from the first settling tank and surplus sludge from the final settling tank in a mixed thickening tank, and due to fluctuations in the ratio, the necessary flocculant injection is required. The amount also changes. Therefore, by simply measuring the sludge concentration as in this method, it may not be possible to appropriately control the amount of coagulant injected.
また、被供給汚泥の有機含有量を検出して凝集剤注入量
を制御する方法（特開昭５４−１２９７４８号、「汚泥
処理設備における薬品性入着制御装置Ｊ）、被供給汚泥
のアルカリ度を検出して凝集剤注入量を制御する方法（
特開昭５５−５６８９６号。In addition, a method for controlling the amount of flocculant injection by detecting the organic content of the supplied sludge (JP-A-54-129748, "Chemical adhesion control device J in sludge treatment equipment"), alkalinity of the supplied sludge, etc. How to detect and control flocculant injection amount (
Japanese Patent Publication No. 55-56896.
［汚泥処理方式における凝集剤注入制御方法」）、被供
給汚泥のｐＨを各々検出して凝集剤注入量を制御する方
法（特開昭５８−１２８１９９号、［脱水機の薬品注入
制御方法」）などが提案されている。しかしいずれも汚
泥特性の変動に対してフィードフォワード的にＲ集剤注
入量を定めたものである。このため、汚泥特性の変動に
早急に対応できる利点はあるものの、凝集剤注入後、生
成される凝集混和物の状態を適切に反映した制御方式で
はない。この結果、脱水された汚泥ケーキ含水率が変動
するおそれがあった。[Method for controlling flocculant injection in sludge treatment system''), method for controlling the amount of flocculant injection by detecting the pH of the supplied sludge (JP-A No. 58-128199, [Method for controlling chemical injection in dewatering machine'') etc. have been proposed. However, in both cases, the R collection agent injection amount is determined in a feedforward manner in response to changes in sludge characteristics. Therefore, although it has the advantage of being able to quickly respond to changes in sludge properties, it is not a control method that appropriately reflects the state of the flocculated mixture produced after flocculant injection. As a result, the moisture content of the dehydrated sludge cake may vary.
そこで本発明者は、凝集混和槽で攪拌、混合された汚泥
が脱水機の重力脱水部で自然脱水される際、凝集剤が不
足し、フロック形成が充分性なわれていない場合には懸
濁物が重力脱水部の枦布を通過し、脱水ｐ液の濁度が高
くなることに着目した。そしてこの濁度と加圧脱水部を
経て生成された汚泥ケーキ含水率を比較したところ、第
１図に示したように、攪拌速度によシその絶対値は異な
るが両者には一定の関係が成立することを見い出した。Therefore, the present inventor discovered that when the sludge that has been stirred and mixed in the flocculation mixing tank is naturally dehydrated in the gravity dehydration section of the dehydrator, if there is insufficient flocculant and floc formation is not sufficient, the sludge will be suspended. We focused on the fact that the turbidity of the dehydrated p-liquid increases as substances pass through the cloth in the gravity dehydration section. When we compared this turbidity with the water content of the sludge cake produced through the pressurized dewatering section, we found that, as shown in Figure 1, although the absolute value differs depending on the stirring speed, there is a constant relationship between the two. I found out that it works.
本発明は、上述した知見にもとづいてなされたもので、
その目的とするところは、濁度が常に一定値以下になる
よう、な凝集剤注入量制御を行なうことによシ、汚泥ケ
ーキ含水率を低い値で安定させることができる汚泥の脱
水方法及び脱水装置を得んとするものである。The present invention was made based on the above-mentioned findings, and
The purpose of this is to provide a sludge dewatering method and dewatering method that can stabilize the water content of the sludge cake at a low value by controlling the amount of coagulant injected so that the turbidity is always below a certain value. The purpose is to obtain equipment.
すなわち第１の発明は、汚泥に凝集剤を注入して混合、
撹拌する工程と、この工程で生成した凝集混和物をｐ布
で重力脱水する工程を含む汚泥の脱水方法において、上
記重力脱水工程で分離されたｐ液の濁度を測定し、この
測定値にもとづいて上記凝集剤の注入量を制御すること
を特徴とする。That is, the first invention involves injecting a flocculant into sludge and mixing it,
In a sludge dewatering method that includes a step of stirring and a step of gravity dewatering the flocculated mixture produced in this step with a P cloth, the turbidity of the P liquid separated in the above gravity dewatering step is measured, and the measured value is The method is characterized in that the injection amount of the flocculant is controlled based on the above.
また第２の発明は、汚泥貯留槽からの汚泥と凝集剤貯留
槽からの凝集剤が流入する凝集混和槽と、上記凝集剤貯
留槽から凝集混和槽への管路に備えた流量調整弁と、上
記凝集混和槽からの凝集混和物が流入する重力脱水部を
有するイルトゾレス脱水機と、上記重力脱水部の涙液排
出部に設けた濁度計と、同濁度計の検出値と設定濁度と
を比較演算しその偏差に応じて上記流量１４整弁を操作
する制御器とを具備することを特徴とする。A second invention also provides a flocculation mixing tank into which sludge from a sludge storage tank and a flocculant from a flocculant storage tank flow, and a flow rate regulating valve provided in a pipe line from the flocculant storage tank to the flocculation mixing tank. , an Irtosoles dehydrator having a gravity dehydration section into which the flocculated mixture flows from the flocculation mixing tank, a turbidity meter installed in the tear discharge section of the gravity dehydration section, and the detection value and setting turbidity of the turbidity meter. The present invention is characterized by comprising a controller that compares and calculates the flow rate and operates the flow rate valve 14 according to the deviation.
以下本発明を図示する実施例を参照して説明する。The present invention will be described below with reference to illustrative embodiments.
第２図は汚泥の脱水装置の一例を示す。この脱水装置は
、混合濃縮槽（図示せず）から送られてきた下水汚泥を
貯留する汚泥貯留槽１と、凝集剤貯留槽２と、汚泥貯留
槽１から供給される汚泥及び凝集剤貯留槽２から供給さ
れる凝集剤を混合、攪拌するＩＩｉ集混和槽３と同凝集
混和４１３の凝集混和物が管路４を経て供給されるベル
トプレス型脱水機５とを備え、凝集剤貯留槽２から凝集
混和槽３への管路に流量調整弁６を取付けた構成である
。Figure 2 shows an example of a sludge dewatering device. This dewatering device includes a sludge storage tank 1 that stores sewage sludge sent from a mixing thickening tank (not shown), a flocculant storage tank 2, and a sludge and flocculant storage tank supplied from the sludge storage tank 1. The flocculant storage tank 2 is equipped with a belt press type dehydrator 5 to which the agglomerated mixture of the flocculant mixture 413 is supplied via the pipe 4, In this configuration, a flow rate regulating valve 6 is attached to the pipe line from the flocculation mixing tank 3 to the flocculation mixing tank 3.
上記ベルトプレス型脱水機５は、重力脱水部７と加圧脱
水部８とから構成されている。重力脱水部２は、デケッ
ト型戸布９をエンドレス状に設け、これをモータ１０で
駆動するもので、この重力脱水部７の下部には、重力脱
水Ｆ液を集める排出部１１が設けられてｂる。一方加圧
脱水部８は、上記重力脱水部７で自然脱水された凝集混
和物を圧縮脱水するもので、凝集混和物をはさむ２枚の
炉布１２．１３をエンドレス状につなぎ合せて、モータ
１４で周回運動させるものである。The belt press type dehydrator 5 is composed of a gravity dewatering section 7 and a pressure dehydrating section 8. The gravity dewatering section 2 is provided with endless decket-type door cloths 9, which are driven by a motor 10. At the bottom of the gravity dewatering section 7, a discharge section 11 is provided to collect the gravity dewatering F liquid. bru. On the other hand, the pressurized dehydration section 8 compresses and dehydrates the flocculated mixture that has been naturally dehydrated in the gravity dehydration section 7, and connects two furnace cloths 12 and 13 that sandwich the flocculated mixture in an endless manner, and 14 to perform circular motion.
しかして上記排出部１１には、重力脱水涙液濁度を測定
する濁度計１５が設けである。この濁度計１５は検出値
を・制御装置１６に入力している。制御装置ノロは、こ
の検出値と予じめ定めた設定値とを比較演算し、その偏
差に対応した信号を上記調整弁６に入力して調整弁６を
操作するものである。The discharge section 11 is provided with a turbidity meter 15 for measuring the turbidity of gravitational dehydration tear fluid. This turbidity meter 15 inputs detected values to a control device 16. The control device Noro compares and calculates this detected value with a predetermined set value, inputs a signal corresponding to the deviation to the regulating valve 6, and operates the regulating valve 6.
本発明方法は、このように宿成された脱水装置を用いて
、次のように高含水廃棄物を脱水する。In the method of the present invention, high water content waste is dehydrated as follows using the dewatering apparatus constructed as described above.
汚泥貯留槽１から供給された汚泥と凝集剤貯留槽２から
供給された凝集剤とを凝集混和槽３で混合、攪拌する。The sludge supplied from the sludge storage tank 1 and the flocculant supplied from the flocculant storage tank 2 are mixed and stirred in the flocculation mixing tank 3.
次いで凝集混和槽３で生成された凝集混和物をベルトプ
レス型脱水機５の重力脱水部７に導き、自然脱水させた
後、加圧脱水部８に送υ、２枚の戸布１２．１３にはさ
んで圧縮脱水した後排水する。この際、上記重力脱水部
７で生成した重力脱水Ｆ液を排出部１１に集め、との濁
度を濁度計１５で測定して、測定値信号を制御装ａｌｅ
ＩＣ入力する。制御装置１６では、予じめ第１図に示す
如き濁度と汚泥クー中含水率との関係がデータとして入
っておシ、ここで測定された検出濁度と予じめ定めた設
定値とを比較演算し、その偏差によって、流量調整弁６
を操作し、所望の汚泥ケーキ含水率となるように凝集剤
注入量を制御する。Next, the flocculated mixture produced in the flocculation mixing tank 3 is led to the gravity dehydration section 7 of the belt press type dehydrator 5, and after being naturally dehydrated, it is sent to the pressure dehydration section 8, where it is separated into two sheets of cloth 12.13. After compressing and dehydrating the water, drain it. At this time, the gravity dehydrated liquid F generated in the gravity dehydration section 7 is collected in the discharge section 11, and its turbidity is measured with the turbidity meter 15, and the measured value signal is sent to the control device ale.
Enter IC. In the control device 16, the relationship between turbidity and water content in the sludge cooler as shown in FIG. are compared, and based on the deviation, the flow rate adjustment valve 6
to control the amount of coagulant injected to achieve the desired sludge cake moisture content.
なお上記実施例では、重力脱水部７で脱水されたＦ液の
濁度を測定したが、本発明はこれに限ら々い。例えば凝
集混和物をサンプリングし、これを濾過して得たｐ液の
濁度を測定するようにしてもよい。In the above embodiment, the turbidity of the F liquid dehydrated in the gravity dehydration section 7 was measured, but the present invention is not limited to this. For example, the turbidity of the p liquid obtained by sampling the agglomerated mixture and filtering it may be measured.
しかして本発明によれば、涙液の濁度にもとづいて凝集
剤注入量を制御しているので、第１図からも明らかなよ
うに被供給汚泥の特性変動に対応して適正な凝集剤量を
注入でき、安定したしかも低い含水率の汚泥ケーキを得
ることができる。更に本発明では、被供給汚泥流量を測
定する必要がなく、制御装置を簡易とすることができる
など顕著な効果を奏する。However, according to the present invention, since the amount of flocculant injected is controlled based on the turbidity of the lachrymal fluid, as is clear from FIG. A stable sludge cake with a low moisture content can be obtained. Further, in the present invention, there is no need to measure the flow rate of the supplied sludge, and the control device can be simplified, and other remarkable effects are achieved.
第１図は濁度と汚泥ケーキ含水率との関係を示す特性図
、第２図は本発明の一実施例を示す汚泥の脱水装置の説
明図である。
１・・・汚泥貯留槽、２・・・凝集剤貯留槽、３・・・
凝集混和槽、４・・・管路、５・・・ベルトプレス型脱
水機、６・・・流量調整弁、７・・・重力脱水部、８・
・・加圧脱水部、９・・・ポケット型戸布、１０・・・
モータ１１・・・排出部、１２．１３・・・ｐ布、１４
・・・モータ、１５・・・濁度計、１６・・・制御装置
。
出願人代理人 弁理士 鈴 江 武 彦τ’Ｊ！ ２
図FIG. 1 is a characteristic diagram showing the relationship between turbidity and sludge cake water content, and FIG. 2 is an explanatory diagram of a sludge dewatering apparatus showing an embodiment of the present invention. 1...Sludge storage tank, 2...Flocculant storage tank, 3...
Coagulation mixing tank, 4... Pipe line, 5... Belt press type dehydrator, 6... Flow rate adjustment valve, 7... Gravity dewatering section, 8...
... Pressurized dehydration section, 9... Pocket type door cloth, 10...
Motor 11...discharge section, 12.13...p cloth, 14
...Motor, 15...Turbidity meter, 16...Control device. Applicant's agent Patent attorney Takehiko Suzue τ'J! 2
figure
Claims (1)
の工程で生成した凝集混和物を炉布で重力脱水する工程
とを含む汚泥の脱水方法において、上記重力脱水１穆で
分離された涙液の濁度を測定し、この測定値にもとづい
て上記凝集剤の注入量を制御することを特徴とする汚泥
の脱水方法。 （２）汚泥貯留槽からの汚泥と凝集剤貯留槽からの凝集
剤が流入する凝集混和槽と、上記凝集剤貯留槽から凝集
混和槽への管路に備えた流量調整弁と、上記凝集混和槽
からの凝集混和物が流入する重力脱水部を有するペルト
ゲレス脱水機と、上記重力脱水部の涙液排出部に設けた
濁度計と、同濁度計の検出値と設定濁度とを比較演算し
その、偏差に応じて上記流量調整弁を操作する制御器と
を具備してなる汚泥の脱水装置。[Scope of Claims] m. A sludge dewatering method comprising a step of injecting, mixing and stirring a flocculant into sludge, and a step of gravity dewatering the flocculated mixture produced in this step with a furnace cloth, 1. A method for dewatering sludge, comprising measuring the turbidity of the lachrymal fluid separated in one layer, and controlling the injection amount of the flocculant based on the measured value. (2) A flocculation mixing tank into which sludge from the sludge storage tank and flocculant from the flocculant storage tank flow, a flow rate adjustment valve provided in a pipe line from the flocculant storage tank to the flocculation mixing tank, and the flocculation mixing tank. Compare the detection value and set turbidity of a Pertgelles dehydrator that has a gravity dehydration section into which the flocculated mixture flows from the tank, and a turbidity meter installed in the tear discharge section of the gravity dehydration section. A sludge dewatering device comprising: a controller that performs calculations and operates the flow rate regulating valve according to the deviation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59052390A JPS60197300A (en) | 1984-03-21 | 1984-03-21 | Method and apparatus for dehydrating sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59052390A JPS60197300A (en) | 1984-03-21 | 1984-03-21 | Method and apparatus for dehydrating sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60197300A true JPS60197300A (en) | 1985-10-05 |
Family
ID=12913470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59052390A Pending JPS60197300A (en) | 1984-03-21 | 1984-03-21 | Method and apparatus for dehydrating sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60197300A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08299996A (en) * | 1995-05-08 | 1996-11-19 | Nishihara Environ Sanit Res Corp | Separated liquid monitor |
| JPH11347599A (en) * | 1998-06-04 | 1999-12-21 | Fuji Electric Co Ltd | Flocculant injection amount determining apparatus |
| JP2006272228A (en) * | 2005-03-30 | 2006-10-12 | Kurita Water Ind Ltd | Dewatering method and apparatus for sludge |
-
1984
- 1984-03-21 JP JP59052390A patent/JPS60197300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08299996A (en) * | 1995-05-08 | 1996-11-19 | Nishihara Environ Sanit Res Corp | Separated liquid monitor |
| JPH11347599A (en) * | 1998-06-04 | 1999-12-21 | Fuji Electric Co Ltd | Flocculant injection amount determining apparatus |
| JP2006272228A (en) * | 2005-03-30 | 2006-10-12 | Kurita Water Ind Ltd | Dewatering method and apparatus for sludge |
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