JPH06296978A - Device for removing phosphorus from digested sludge dehydration filtrate - Google Patents
Device for removing phosphorus from digested sludge dehydration filtrateInfo
- Publication number
- JPH06296978A JPH06296978A JP5091713A JP9171393A JPH06296978A JP H06296978 A JPH06296978 A JP H06296978A JP 5091713 A JP5091713 A JP 5091713A JP 9171393 A JP9171393 A JP 9171393A JP H06296978 A JPH06296978 A JP H06296978A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- phosphorus
- filtrate
- tank
- chemical injection
- 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
- Removal Of Specific Substances (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は消化汚泥脱水濾液を対象
として、薬品注入によりリンを除去する手段において、
リン濃度を測定して薬品注入量を制御するようにしたリ
ン除去装置に関するものである。BACKGROUND OF THE INVENTION The present invention is directed to a digested sludge dehydrated filtrate, and in a means for removing phosphorus by chemical injection,
The present invention relates to a phosphorus removing device that measures the phosphorus concentration and controls the chemical injection amount.
【０００２】[0002]
【従来の技術】リンは地中に広く存在する元素であって
自然水中にも含まれているが、特に屎尿とか汚泥，肥料
等に多量に含まれているため、これらが自然水に混入す
る場合が多い。水中におけるリンは、オルトリン酸塩，
メタリン酸塩，ピロリン酸塩，ポリリン酸塩とか、リン
酸エステル，リン脂質等の有機性リン化合物等種々の形
態で存在する。リンの形態はリン酸イオン態リンと加水
分解性リン及び全リンの３種類に分けられ、これらは更
に溶解性と不溶解性とに分けられる。2. Description of the Related Art Phosphorus is a widely existing element in the earth and is also contained in natural water. However, since phosphorus is contained in large amounts in human waste, sludge, fertilizer, etc., phosphorus is mixed in natural water. In many cases. Phosphorus in water is orthophosphate,
It exists in various forms such as metaphosphates, pyrophosphates, polyphosphates, and organic phosphorus compounds such as phosphates and phospholipids. The form of phosphorus is classified into three types, that is, phosphate ion-type phosphorus, hydrolyzable phosphorus, and total phosphorus, which are further divided into soluble and insoluble.
【０００３】これら種々のリン化合物は、前処理によっ
て最終的にすべてオルトリン酸とし、リン酸イオン固有
の反応を利用して測定し、リンの量で表わしている。リ
ン自体は生物の増殖活動に重要な役割を果たしており、
且つ下水等の生物処理においては必須の元素であるが、
他方でリンは湖沼とか海域の富栄養化を促進する一因と
もなっており、水中におけるリン化合物の増加は好まし
くない。All of these various phosphorus compounds are finally converted to orthophosphoric acid by pretreatment, measured using the reaction peculiar to phosphate ions, and expressed as the amount of phosphorus. Phosphorus itself plays an important role in the growth activity of organisms,
And it is an essential element in biological treatment of sewage,
On the other hand, phosphorus is one of the factors that promote eutrophication in lakes and sea areas, and an increase in phosphorus compounds in water is not preferable.
【０００４】他方で下水汚泥の嫌気性消化手段は、固相
からリンが溶解する現象が見られる。そのため消化汚泥
の液相には比較的高濃度，例えば１００〜３００ｍｇ・
Ｐ／ｌ程度のリン酸イオン態リンを含むことが知られて
いる。上記のリン酸イオン態リンとは水中のリン酸イオ
ンをリン（Ｐ）の量で表したものである。On the other hand, in the anaerobic digestion means for sewage sludge, the phenomenon that phosphorus is dissolved from the solid phase is observed. Therefore, the liquid phase of digested sludge has a relatively high concentration, for example 100-300 mg.
It is known to contain phosphate ion phosphorus of about P / l. The above-mentioned phosphate ion type phosphorus is a phosphate ion in water expressed by the amount of phosphorus (P).
【０００５】従来の下水汚泥に対する水処理系の具体例
を図２に基づいて説明すると、流入水１が最初沈澱池２
からエアレーションタンク３及び最終沈澱池４を経由し
て処理水５として放流される間に、最初沈澱池２の初沈
汚泥６が最終沈澱池４の余剰汚泥７とともに汚泥濃縮槽
８に送り込まれる。尚、この余剰汚泥７の一部はエアレ
ーションタンク３に戻されている。汚泥濃縮槽８の上澄
液９は、返流水１０とともに最初沈澱池２に還流され、
汚泥濃縮槽８の濃縮汚泥１１は汚泥消化槽１２に送り込
まれて嫌気性の消化処理が行われる。A concrete example of a water treatment system for conventional sewage sludge will be described with reference to FIG.
While being discharged as treated water 5 through the aeration tank 3 and the final settling tank 4, the first settling sludge 6 in the first settling tank 2 is sent to the sludge thickening tank 8 together with the surplus sludge 7 in the final settling tank 4. A part of this excess sludge 7 is returned to the aeration tank 3. The supernatant liquid 9 of the sludge thickening tank 8 is first returned to the sedimentation tank 2 together with the return water 10,
The thickened sludge 11 in the sludge thickening tank 8 is sent to the sludge digesting tank 12 and subjected to anaerobic digestion treatment.
【０００６】そして汚泥消化槽１２の消化汚泥１３に、
高分子凝集剤注入装置１４から高分子凝集剤が注入され
て凝集処理され、凝集後に脱水機１５にかけて脱水ケー
キ１６を得て廃棄処分される一方、脱水濾液１７は返流
水１０として前記上澄液９とともに最初沈澱池２に返流
される。通常高分子凝集剤としてリン除去能力がない薬
品が用いられる。In the digested sludge 13 of the sludge digestion tank 12,
The polymer coagulant is injected from the polymer coagulant injecting device 14 to perform coagulation treatment, and after coagulation, the dehydrator 15 is subjected to dehydration cake 16 to be discarded, while the dehydration filtrate 17 is the supernatant liquid as the return water 10. First returned to Settling Pond 2 with 9. As the polymer flocculant, a chemical having no phosphorus removing ability is usually used.
【０００７】[0007]
【発明が解決しようとする課題】しかしながらこのよう
な従来の下水汚泥処理装置では、脱水機の脱水濾液を対
象としてリンを除去する適当な方法がないため、処理水
のリン濃度が高くなってしまうという課題があった。However, in such a conventional sewage sludge treatment device as described above, there is no suitable method for removing phosphorus from the dehydrated filtrate of the dehydrator, so that the phosphorus concentration of the treated water becomes high. There was a problem.
【０００８】例えば図２に示した例では、脱水濾液１７
を最初沈澱池２に返流水１０としてそのまま返流してい
るため、これが処理水５のリン濃度を高める原因とな
る。特にリンの排出規制が実施された場合を想定する
と、生物学的リン除去方法として知られる嫌気好気活性
汚泥法を採用した装置であっても、嫌気性消化槽から排
出される消化汚泥の脱水濾液を含む返流水によって水処
理系へのリンの負荷が高くなってしまい、上記排出規制
をクリヤできないことが予想される。For example, in the example shown in FIG. 2, dehydrated filtrate 17
Is first returned to the settling tank 2 as the return water 10 as it is, which causes the phosphorus concentration of the treated water 5 to be increased. Assuming that the emission control of phosphorus is implemented, even if the device adopts the anaerobic aerobic activated sludge method known as a biological phosphorus removal method, dehydration of digested sludge discharged from an anaerobic digestion tank is performed. It is expected that the above-mentioned emission regulation cannot be cleared because the load of phosphorus on the water treatment system becomes high due to the return water containing the filtrate.
【０００９】上記の生物学的リン除去方法で規制をクリ
ヤできない場合には、薬品の注入によってリンを沈澱除
去する方法が考慮される。前記例の場合にはエアレーシ
ョンタンク３に対して直接薬品を注入する手段とか、二
次処理水もしくは返流水１０に薬品を注入する手段が考
えられる。しかしこのような薬品注入手段は、リン濃度
に応じて過不足なく薬品を注入することが要求されるも
のであって、単に一定量の薬品を注入するとか、定注入
率流量比例注入制御手段を採用すると、リン濃度が高い
場合には薬品注入量が不足してしまい、リン濃度が低い
場合には薬品の注入過剰となって該薬品の無駄が生じて
しまうという問題があった。When regulation cannot be cleared by the above-mentioned biological phosphorus removal method, a method of precipitating and removing phosphorus by injecting a chemical is considered. In the case of the above example, a means for directly injecting the chemical into the aeration tank 3 or a means for injecting the chemical into the secondary treated water or the return water 10 can be considered. However, such a chemical injection means is required to inject chemicals in an appropriate amount according to the phosphorus concentration, and simply injects a fixed amount of chemicals or a constant injection rate flow rate proportional injection control means. If adopted, there is a problem that the amount of chemicals injected becomes insufficient when the phosphorus concentration is high and the chemicals are excessively injected when the phosphorus concentration is low, resulting in waste of the chemicals.
【００１０】特に前記処理水５のリン濃度を低減させる
ためには、脱水濾液１７に溶解しているリンを除去する
ことが望ましい。そのためには、上記脱水濾液１７にア
ルミニウム塩とか石灰等のリン不溶化試薬を注入してリ
ンを沈澱分離して除去する手段が有効であるものと考え
られるが、リン濃度を自動的に測定する方法が開発され
ていないため、リン除去を目的とした薬品注入制御は実
施されていない現状にある。Particularly, in order to reduce the phosphorus concentration of the treated water 5, it is desirable to remove the phosphorus dissolved in the dehydrated filtrate 17. For that purpose, it is considered that a means for injecting an aluminum salt or a phosphorus insolubilizing reagent such as lime into the dehydrated filtrate 17 to precipitate and separate phosphorus for removal is effective, but a method for automatically measuring the phosphorus concentration Has not been developed, the chemical injection control for the purpose of phosphorus removal is not currently implemented.
【００１１】そこで本発明はこのような従来の下水汚泥
処理装置等におけるリン除去に関する課題を解消して、
脱水濾液を対象としてリンを除去することにより、処理
水のリン濃度を低減することができるリン除去装置を提
供することを目的とするものである。Therefore, the present invention solves the above-mentioned problems relating to phosphorus removal in conventional sewage sludge treatment equipment,
It is an object of the present invention to provide a phosphorus removing device capable of reducing the phosphorus concentration of treated water by removing phosphorus from the dehydrated filtrate.
【００１２】[0012]
【課題を解決するための手段】本発明は上記の目的を達
成するために、嫌気性の汚泥消化槽によって処理された
消化汚泥に、高分子凝集剤を注入してから脱水機により
脱水処理し、該脱水濾液を返流水として再度水処理系に
よって処理するようにして下水汚泥処理装置において、
脱水濾液排出管路を介して上記脱水機に接続された脱水
濾液一時貯留槽と、この脱水濾液排出管路からサンプリ
ングされた脱水濾液のリン濃度を測定するリン濃度自動
測定装置と、該脱水濾液の流量を測定する流量計と、測
定された脱水濾液のリン濃度と流量からリン除去用薬品
との化学量論的関係に基づいて最終薬品注入率を演算す
る薬品注入制御演算装置と、演算された最終薬品注入率
に基づいて前記脱水濾液一時貯留槽に所定量の薬品を注
入する薬品注入装置とを具備した消化汚泥脱水濾液のリ
ン除去装置の構成にしてある。[Means for Solving the Problems] In order to achieve the above object, the present invention performs a dehydration treatment with a dehydrator after injecting a polymer flocculant into digested sludge treated by an anaerobic sludge digestion tank. In the sewage sludge treatment device, the dehydrated filtrate is treated as return water by a water treatment system again,
A dehydration filtrate temporary storage tank connected to the dehydrator via the dehydration filtrate discharge conduit, a phosphorus concentration automatic measuring device for measuring the phosphorus concentration of the dehydration filtrate sampled from the dehydration filtrate discharge conduit, and the dehydration filtrate A flow meter that measures the flow rate of the chemicals, a chemical injection control calculation device that calculates the final chemical injection rate based on the stoichiometric relationship between the measured phosphorus concentration and the flow rate of the dehydrated filtrate and the chemicals for phosphorus removal. A phosphorus removing device for the dehydrated filtrate of digested sludge is provided, which comprises a chemical injection device for injecting a predetermined amount of chemical into the temporary storage tank for dehydrated filtrate based on the final chemical injection rate.
【００１３】更に請求項２により、上記脱水濾液一時貯
留槽に沈澱槽を付設して、該沈澱槽の底部から薬品の注
入処理によって不溶化された沈澱物を引き抜いて脱水機
に戻し、該沈澱槽の上澄液は返流水として水処理系に返
流するようにしたリン除去装置の構成にしてある。Further, according to claim 2, a precipitation tank is attached to the temporary storage tank for dehydrated filtrate, the precipitate insolubilized by the chemical injection process is drawn from the bottom of the precipitation tank and returned to the dehydrator, and the precipitation tank is removed. The above supernatant liquid is configured as a phosphorus removing device that is returned to the water treatment system as return water.
【００１４】[0014]
【作用】かかる消化汚泥脱水濾液のリン除去装置によれ
ば、流入水が水処理系により処理水として放流される間
に、嫌気性の汚泥消化槽によって嫌気性の消化処理が行
われ、且つ消化汚泥中に高分子凝集剤が注入されて凝集
処理されて、凝集後に脱水機にかけて脱水ケーキが得ら
れるが、この脱水機の脱水濾液が脱水濾液一時貯留槽に
送り込まれて一時貯留される。[Function] According to the phosphorus removing apparatus for the digested sludge dehydrated filtrate, the anaerobic sludge digestion tank performs the anaerobic digestion treatment while the inflowing water is discharged as the treated water by the water treatment system, and the digestion is performed. A polymer flocculant is injected into the sludge for coagulation treatment, and after coagulation, a dehydrator is subjected to a dehydrator to obtain a dehydrated cake, and the dehydrated filtrate of this dehydrator is sent to and temporarily stored in the dehydrated filtrate temporary storage tank.
【００１５】この時に脱水機の脱水濾液排出管路からか
らサンプリングされた脱水濾液のリン濃度が自動測定装
置によって自動的に測定され、この測定値から薬品注入
制御演算装置によってリンとリン除去用薬品との化学量
論的関係に基づく薬品注入率が演算され、且つこの薬品
注入率に、流量計によって測定された脱水濾液の流量の
データを乗じて最終薬品注入率を決定される。この最終
薬品注入率に基づいて薬品注入装置から脱水濾液一時貯
留槽に薬品の注入が行われ、リン不溶化処理が実施され
る。At this time, the phosphorus concentration of the dehydrated filtrate sampled from the dehydrated filtrate discharge pipe of the dehydrator is automatically measured by an automatic measuring device, and from this measured value, phosphorus and phosphorus removing chemicals are controlled by a chemical injection control computing device. The chemical injection rate is calculated based on the stoichiometric relationship with and the final chemical injection rate is determined by multiplying the chemical injection rate by the flow rate data of the dehydrated filtrate measured by the flow meter. Based on this final chemical injection rate, chemicals are injected from the chemical injection device into the dehydrated filtrate temporary storage tank, and phosphorus insolubilization treatment is performed.
【００１６】このように薬品処理により不溶化された沈
澱物は脱水機に戻され、再度脱水処理され、上澄液は返
流水として水処理系に返流される。The precipitate thus insolubilized by the chemical treatment is returned to the dehydrator and dehydrated again, and the supernatant is returned to the water treatment system as return water.
【００１７】[0017]
【実施例】以下図１により本発明にかかる消化汚泥脱水
濾液のリン除去装置の具体的な実施例を、前記従来の構
成部分と同一の構成部分に同一の符号を付して詳述す
る。２は流入水１が流入する最初沈澱池、３はエアレー
ションタンク、４は最終沈澱池、８は汚泥濃縮槽、１２
は汚泥消化槽、１４は高分子凝集剤注入装置、１５は脱
水機である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the phosphorus removing apparatus for digested sludge dewatering filtrate according to the present invention will be described in detail below with reference to FIG. 2 is a first settling tank into which inflow water 1 flows in, 3 is an aeration tank, 4 is a final settling tank, 8 is a sludge thickening tank, 12
Is a sludge digestion tank, 14 is a polymer coagulant injection device, and 15 is a dehydrator.
【００１８】そして上記脱水機１５から導出された脱水
濾液排出管路１８が脱水濾液一時貯留槽１９に接続され
ている。２０は撹拌機構、２１は脱水濾液のリン濃度自
動測定装置、２２は流量計、２３は脱水濾液に対する薬
品注入制御演算装置、２４は脱水濾液一時貯留槽１９へ
の薬品注入装置、２５は沈澱槽である。The dehydrated filtrate discharge pipe 18 led out from the dehydrator 15 is connected to a dehydrated filtrate temporary storage tank 19. Reference numeral 20 is a stirring mechanism, 21 is an automatic phosphorus concentration measuring device for dehydrated filtrate, 22 is a flow meter, 23 is a chemical injection control calculation device for dehydrated filtrate, 24 is a chemical injection device for temporarily storing dehydrated filtrate 19, and 25 is a precipitation tank. Is.
【００１９】本実施例の基本的な動作態様を以下に説明
する。即ち、流入水１が最初沈澱池２からエアレーショ
ンタンク３及び最終沈澱池４を経由して処理水５として
放流される間に、最初沈澱池２の初沈汚泥６が最終沈澱
池４の余剰汚泥７とともに汚泥濃縮槽８に送り込まれ
る。この余剰汚泥７の一部はエアレーションタンク３に
戻される。又、汚泥濃縮槽８の上澄液９は、返流水１０
とともに最初沈澱池２に還流され、汚泥濃縮槽８の濃縮
汚泥１１は、汚泥消化槽１２に送り込まれて嫌気性の消
化処理が行われる。The basic operation mode of this embodiment will be described below. That is, while the influent 1 is discharged from the first settling tank 2 as treated water 5 via the aeration tank 3 and the final settling tank 4, the first settling sludge 6 in the first settling tank 2 is the surplus sludge in the final settling tank 4. It is sent to the sludge thickening tank 8 together with 7. Part of this excess sludge 7 is returned to the aeration tank 3. Also, the supernatant liquid 9 of the sludge thickening tank 8 is the return water 10
At the same time, the sludge is first returned to the settling tank 2, and the thickened sludge 11 in the sludge thickening tank 8 is sent to the sludge digesting tank 12 for anaerobic digestion treatment.
【００２０】この汚泥消化槽１２の消化汚泥１３中に高
分子凝集剤注入装置１４から凝集剤が注入されて凝集処
理される。尚、この凝集剤はリン除去能力がない高分子
凝集剤が採用される。そして凝集後に脱水機１５にかけ
て脱水ケーキ１６を得る一方、脱水機１５の脱水濾液
は、脱水濾液排出管路１８を経由して脱水濾液一時貯留
槽１９に送り込まれる。A coagulant is injected from the polymer coagulant injection device 14 into the digested sludge 13 of the sludge digestion tank 12 for coagulation treatment. As the coagulant, a polymer coagulant having no phosphorus removing ability is adopted. Then, after the flocculation, the dehydrated cake is applied to the dehydrator 15 to obtain the dehydrated cake 16, while the dehydrated filtrate of the dehydrator 15 is sent to the dehydrated filtrate temporary storage tank 19 via the dehydrated filtrate discharge conduit 18.
【００２１】この時に脱水濾液排出管路１８からサンプ
リングされた脱水濾液がリン濃度自動測定装置２１に供
給されてリン濃度が自動的に測定され、この測定値が電
気信号に変換されて薬品注入制御演算装置２３に入力さ
れ、同時に流量計２２によって脱水濾液の流量が測定さ
れて、この測定値が同様に電気信号に変換されて薬品注
入制御演算装置２３に入力される。At this time, the dehydrated filtrate sampled from the dehydrated filtrate discharge conduit 18 is supplied to the phosphorus concentration automatic measuring device 21 to automatically measure the phosphorus concentration, and the measured value is converted into an electric signal to control the chemical injection. The flow rate of the dehydrated filtrate is measured by the flow meter 22 at the same time as being input to the arithmetic unit 23, and the measured value is similarly converted into an electric signal and input to the chemical injection control arithmetic unit 23.
【００２２】薬品注入制御演算装置２３は、脱水濾液の
リン濃度に関するデータからリンとリン除去用薬品との
化学量論的関係に基づく薬品注入率を演算し、この薬品
注入率に流量計２２によって測定された流量のデータを
乗じて最終薬品注入率を決定し、この最終薬品注入率に
基づいて薬品注入装置２４を駆動することによって脱水
濾液一時貯留槽１９に薬品の注入が行われる。そして撹
拌機構２０の駆動に伴って脱水濾液の撹拌が行われてリ
ン不溶化処理が実施される。The chemical injection control arithmetic unit 23 calculates the chemical injection rate based on the stoichiometric relationship between phosphorus and the chemicals for phosphorus removal from the data on the phosphorus concentration of the dehydrated filtrate, and the flow meter 22 calculates the chemical injection rate based on this chemical injection rate. The final chemical injection rate is determined by multiplying the measured flow rate data, and the chemical injection device 24 is driven based on the final chemical injection rate to inject the chemical into the dehydrated filtrate temporary storage tank 19. Then, the dehydration filtrate is stirred as the stirring mechanism 20 is driven, and the phosphorus insolubilization treatment is performed.
【００２３】このように処理された脱水濾液は沈澱槽２
５に送り込まれ、上記薬品の注入によって不溶化された
沈澱物２６が槽の底部から引き抜かれて脱水機１５に戻
され、再度脱水処理される。この沈澱槽２５の上澄液２
７は返流水１０として前記上澄液９とともに最初沈澱池
２に返流される。The dehydrated filtrate treated in this way is used in the precipitation tank 2
The precipitate 26 that has been sent to the tank 5 and insolubilized by the above-mentioned chemical injection is pulled out from the bottom of the tank and returned to the dehydrator 15 to be dehydrated again. Supernatant liquid 2 of this settling tank 25
7 is returned to the settling tank 2 as return water 10 together with the supernatant 9.
【００２４】本実施例のように消化汚泥１３の脱水濾液
に薬品を注入してリンを除去する手段は、エアレーショ
ンタンク３に直接薬品を注入して手段に比して脱水性不
良に起因する薬品スラッジの発生量が低減されるという
作用がある。The means for injecting a chemical into the dehydrated filtrate of the digested sludge 13 to remove phosphorus as in this embodiment is directly injecting the chemical into the aeration tank 3 and causing a poor dehydration property as compared with the means. This has the effect of reducing the amount of sludge generated.
【００２５】上記リン濃度自動測定装置２１の測定手段
に関しては、本願出願人が先に提案した特願平４−３１
７５９０号に開示した滴定方式による装置を採用すれば
良いが、この測定原理を簡単に説明すると、検体を凝集
分離槽に取り入れて凝集剤の注入により固形物の凝集を
行い、開口部を下向きにして挿入したロートを用いて液
だけをゆっくり吸引して試料溶液とし、この一定量を反
応槽内でリン不溶化試薬注入によってリンを沈澱させ、
この反応槽の下方に配備した自動真空濾過機構を用いて
液体だけを吸引除去した後、沈澱物を濃塩酸で溶解し、
窒素ガスの通気によって溶解炭酸を揮散した後、蒸留水
を加えて滴定用試料溶液とし、電導ビュレットによるア
ルカリの滴定を行って滴定に要したアルカリ溶液の量か
ら計算式を用いて試料溶液中のリン酸イオン態リンの濃
度を算出するものである。この装置によれば、検体中の
高濃度のリン測定する際に、試料を無希釈で測定し、且
つ全操作の自動化を可能にするという特徴を有してい
る。Regarding the measuring means of the phosphorus concentration automatic measuring device 21, the applicant of the present application has previously proposed Japanese Patent Application No. 4-31.
Although the device based on the titration method disclosed in No. 7590 may be adopted, the measuring principle will be briefly described. The sample is taken into the aggregating / separating tank, and the solid matter is agglomerated by injecting the aggregating agent, and the opening is directed downward. Using the funnel inserted as described above, only the liquid is slowly sucked to form a sample solution, and a certain amount of this is precipitated by injecting the phosphorus insolubilizing reagent in the reaction tank,
Only the liquid was sucked and removed using the automatic vacuum filtration mechanism arranged below this reaction tank, and the precipitate was dissolved with concentrated hydrochloric acid,
After volatilizing the dissolved carbonic acid by aeration of nitrogen gas, add distilled water to make a sample solution for titration, perform alkali titration with a conductive burette, and use the formula from the amount of the alkaline solution required for the titration The concentration of phosphate ion-state phosphorus is calculated. According to this device, when measuring a high concentration of phosphorus in a sample, the sample is measured without dilution, and all the operations can be automated.
【００２６】上記リン濃度自動測定装置２１によって測
定されたリンの濃度から最終薬品注入率を算出する演算
手段は以下の通りである。一般にアルミニウム系の凝集
剤を用いた場合には、Ａｌ3+とＰＯ4 3-の反応により、
ＡｌＰＯ4（リン酸アルミニウム）が沈澱する。リン除
去のために使用されるＡｌ／Ｐのモル比は１、重量比は
１．０４０であるが、実際には過剰のＡｌ3+が必要であ
って、希望リン分除去率（％）によっても異なってく
る。具体的には、表１に示されるＡｌ硫酸バンド量が使
用される。この硫酸バンドとはＡｌ2（ＳＯ4）3・１４
Ｈ2Ｏ表わされる。The arithmetic means for calculating the final chemical injection rate from the phosphorus concentration measured by the phosphorus concentration automatic measuring device 21 is as follows. Generally, when an aluminum-based coagulant is used, the reaction between Al 3+ and PO 4 3-
AlPO 4 (aluminum phosphate) precipitates. The Al / P molar ratio used for phosphorus removal is 1, and the weight ratio is 1.040, but in reality an excessive amount of Al 3+ is required, and the desired phosphorus removal rate (%) is required. Will also be different. Specifically, the amount of Al sulfuric acid band shown in Table 1 is used. This sulfuric acid band is Al 2 (SO 4 ) 3・ 14
Represented by H 2 O.
【００２７】[0027]
【表１】 [Table 1]
【００２８】実施に際し、上記表１から希望リン分除去
率を指定して、Ａｌ／Ｐの重量比、もしくは硫酸バンド
のとリンの重量比Ａｌ2（ＳＯ4）3・１４Ｈ2Ｏ／Ｐを求
めてそれぞれｋ，ｋ′とすると、最終薬品注入率は以下
の式で表わされる。In carrying out the present invention, the desired phosphorus removal rate is specified from Table 1 above, and the weight ratio of Al / P or the weight ratio of phosphorus in the sulfuric acid band Al 2 (SO 4 ) 3 .14H 2 O / P is set. The final chemical injection rate is given by the following equation, where k and k'are obtained.
【００２９】 Ａｌ注入率（ppm）＝リン酸イオン態リン濃度測定値(mg/l)×ｋ・・・・（１） Ａｌ2（ＳＯ4）3・１４Ｈ2Ｏ／Ｐ注入率（ppm）＝ リン酸イオン態リン濃度測定値(mg/l)×ｋ′・・（２） 上記の式（１）（２）を用いてアルミニウム系の凝集剤
もしくはＡｌ硫酸バンド量が決定される。Al injection rate (ppm) = phosphoric acid ion-state phosphorus concentration measurement value (mg / l) × k (1) Al 2 (SO 4 ) 3 · 14H 2 O / P injection rate (ppm) = Measured value of phosphate ion phosphorus concentration (mg / l) × k ′ ·· (2) Using the above formulas (1) and (2), the amount of aluminum coagulant or Al sulfate band is determined.
【００３０】[0030]
【発明の効果】以上詳細に説明したように、本発明にか
かる消化汚泥脱水濾液のリン除去装置によれば、汚泥消
化槽によって嫌気性の消化処理が行われた後の消化汚泥
が、高分子凝集剤の注入により凝集処理されてから脱水
機によって脱水処理され、この脱水機の脱水濾液が脱水
濾液一時貯留槽に送り込まれて一時貯留されるとともに
該脱水濾液のリン濃度が自動測定装置によって自動的に
測定され、この測定値から薬品注入制御演算装置によっ
てリンとリン除去用薬品との化学量論的関係に基づく薬
品注入率が演算されて、この薬品注入率に流量計によっ
て測定された脱水濾液の流量のデータを乗じて決定され
た最終薬品注入率によって脱水濾液一時貯留槽に薬品の
注入が行われて、リン不溶化処理を実施することができ
る。As described in detail above, according to the phosphorus removal apparatus for the digested sludge dewatering filtrate according to the present invention, the digested sludge after the anaerobic digestion treatment by the sludge digestion tank is a polymer. The coagulant is injected for coagulation and then dehydrated by a dehydrator. The dehydrated filtrate of the dehydrator is sent to a dehydrated filtrate temporary storage tank for temporary storage and the phosphorus concentration of the dehydrated filtrate is automatically measured by an automatic measuring device. The chemical injection rate is calculated by the chemical injection control calculation device based on the stoichiometric relationship between phosphorus and the phosphorus removal chemical, and the dehydration measured by the flow meter is calculated for this chemical injection rate. According to the final chemical injection rate determined by multiplying the flow rate data of the filtrate, the chemical is injected into the dehydrated filtrate temporary storage tank, and the phosphorus insolubilization treatment can be performed.
【００３１】従って脱水濾液がそのまま水処理系に返流
されていないため、処理水のリン濃度を効果的に低減す
ることが出来て、嫌気性消化槽から排出される消化汚泥
の脱水濾液を含む返流水によって水処理系へのリンの負
荷が高くならず、リンの排出規制に対しても対処可能と
なる。Therefore, since the dehydrated filtrate is not directly returned to the water treatment system, the phosphorus concentration of the treated water can be effectively reduced, and the dehydrated filtrate of digested sludge discharged from the anaerobic digestion tank is included. The return water does not increase the load of phosphorus on the water treatment system, and it becomes possible to deal with phosphorus emission regulations.
【００３２】上記薬品注入制御を実施することにより、
脱水濾液のリン濃度に応じて過不足なく薬品を注入する
ことが可能となり、特に薬品の注入過剰にともなう該薬
品の無駄が生じないという効果が得られる。By performing the above chemical injection control,
It becomes possible to inject the chemicals just enough according to the phosphorus concentration of the dehydrated filtrate, and there is an effect that the chemicals are not wasted particularly when the chemicals are excessively injected.
【００３３】又、上記脱水濾液の溶解性リンの濃度は、
消化状態によっても変動することが知られており、従っ
てリン濃度の測定によって消化状態の良否を判断する目
安にすることが出来る。特に溶解性リンの濃度が異常に
低い場合には消化不足であるものと考えることができ
る。The concentration of soluble phosphorus in the dehydrated filtrate is
It is known that it also varies depending on the digested state, and therefore the measurement of the phosphorus concentration can be used as a standard for judging the quality of the digested state. Particularly when the concentration of soluble phosphorus is abnormally low, it can be considered that the digestion is insufficient.
【００３４】従って本発明によれば、従来の下水汚泥処
理装置等における脱水濾液を対象としてリンを除去する
ことにより、処理水のリン濃度が効果的に低減されると
いう大きな効果が発揮される。Therefore, according to the present invention, by removing the phosphorus from the dehydrated filtrate in the conventional sewage sludge treatment apparatus, the phosphorus concentration of the treated water can be effectively reduced.
【図１】本発明にかかるリン除去装置を適用した下水汚
泥処理装置を全体的に示す概要図。FIG. 1 is an overall schematic view showing a sewage sludge treatment device to which a phosphorus removing device according to the present invention is applied.
【図２】従来の下水汚泥処理装置の一例を示す概要図。FIG. 2 is a schematic diagram showing an example of a conventional sewage sludge treatment device.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年９月１４日[Submission date] September 14, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Name of item to be corrected] Brief description of the drawing
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図面の簡単な説明】[Brief description of drawings]
【図１】 本発明にかかるリン除去装置を適用した下水
汚泥処理装置を全体的に示す概要図。FIG. 1 is an overall schematic view of a sewage sludge treatment device to which a phosphorus removing device according to the present invention is applied.
【図２】 従来の下水汚泥処理装置の一例を示す概要
図。FIG. 2 is a schematic diagram showing an example of a conventional sewage sludge treatment device.
【符号の説明】１…流入水 ２…最初沈澱池 ３…エアレーションタンク ４…最終沈澱池 ５…処理水 ６…初沈汚泥 ７…余剰汚泥 ８…汚泥濃縮槽 １０…返流水 １１…濃縮汚泥 １２…汚泥消化槽 １３…消化汚泥 １４…高分子凝集剤注入装置 １５…脱水機 １８…脱水濾液排出管路 １９…脱水濾液一時貯留槽 ２０…撹拌機構 ２１…リン濃度自動測定装置 ２２…流量計 ２３…薬品注入制御演算装置 ２４…薬品注入装置 ２５…沈澱槽 [Description of Reference Numerals] 1 ... influent water 2 ... first sedimentation basin 3 ... aeration tank 4 ... Last sedimentation basin 5 ... treated water 6 ... primary sludge 7 ... excess sludge 8 ... sludge concentration tank 10 ... return water flow 11 ... thickened sludge 12 ... sludge digestion tank 13 ... digested sludge 14 ... polymer coagulant injection device 15 ... dehydrator 18 ... dehydration filtrate discharge pipe 19 ... dehydration filtrate temporary storage tank 20 ... stirring mechanism 21 ... phosphorus concentration automatic measurement device 22 ... flow meter 23 ... Chemical injection control arithmetic unit 24 ... Chemical injection unit 25 ... Settling tank
Claims (2)
消化汚泥に、高分子凝集剤を注入してから脱水機により
脱水処理し、該脱水濾液を返流水として再度水処理系に
よって処理するようにして下水汚泥処理装置において、 脱水濾液排出管路を介して上記脱水機に接続された脱水
濾液一時貯留槽と、この脱水濾液排出管路からサンプリ
ングされた脱水濾液のリン濃度を測定するリン濃度自動
測定装置と、該脱水濾液の流量を測定する流量計と、測
定された脱水濾液のリン濃度と流量からリン除去用薬品
との化学量論的関係に基づいて最終薬品注入率を演算す
る薬品注入制御演算装置と、演算された最終薬品注入率
に基づいて前記脱水濾液一時貯留槽に所定量の薬品を注
入する薬品注入装置とを具備して成ることを特徴とする
消化汚泥脱水濾液のリン除去装置。1. A high-molecular flocculant is injected into a digested sludge treated in an anaerobic sludge digestion tank, and then dehydrated by a dehydrator, and the dehydrated filtrate is treated again as return water by a water treatment system. In the sewage sludge treatment device, the dehydration filtrate temporary storage tank connected to the dehydrator via the dehydration filtrate discharge pipe and the phosphorus concentration for measuring the phosphorus concentration of the dehydration filtrate sampled from the dehydration filtrate discharge pipe An automatic measuring device, a flow meter that measures the flow rate of the dehydrated filtrate, and a chemical that calculates the final chemical injection rate based on the stoichiometric relationship between the measured phosphorus concentration and the flow rate of the dehydrated filtrate and the chemical for removing phosphorus. A digestion sludge dehydrated filtrate comprising an injection control arithmetic device and a chemical injection device for injecting a predetermined amount of the chemical into the dehydrated filtrate temporary storage tank based on the calculated final chemical injection rate. Phosphorus removal device.
して、該沈澱槽の底部から薬品の注入処理によって不溶
化された沈澱物を引き抜いて脱水機に戻し、該沈澱槽の
上澄液は返流水として水処理系に返流するようにした請
求項１記載の消化汚泥脱水濾液のリン除去装置。2. A precipitation tank is attached to the temporary storage tank for dehydrated filtrate, and the precipitate insolubilized by the chemical injection process is drawn out from the bottom of the precipitation tank and returned to the dehydrator to obtain a supernatant of the precipitation tank. The phosphorus removal apparatus for digested sludge dewatered filtrate according to claim 1, wherein is returned to the water treatment system as return water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091713A JPH06296978A (en) | 1993-04-20 | 1993-04-20 | Device for removing phosphorus from digested sludge dehydration filtrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091713A JPH06296978A (en) | 1993-04-20 | 1993-04-20 | Device for removing phosphorus from digested sludge dehydration filtrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06296978A true JPH06296978A (en) | 1994-10-25 |
Family
ID=14034159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5091713A Pending JPH06296978A (en) | 1993-04-20 | 1993-04-20 | Device for removing phosphorus from digested sludge dehydration filtrate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06296978A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876574A (en) * | 1987-11-04 | 1989-10-24 | Canon Kabushiki Kaisha | Developing apparatus |
| JP2003080269A (en) * | 2001-09-07 | 2003-03-18 | Tohoku Electric Power Co Inc | Method for treating boron-containing water |
| JP2007069053A (en) * | 2005-09-02 | 2007-03-22 | Kobelco Eco-Solutions Co Ltd | Method and facility for treating organic sludge |
| JP2010264417A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| KR101033851B1 (en) * | 2010-07-09 | 2011-05-16 | 주식회사 호국이엔지 | Phosphorous removing apparatus |
| JP2012157836A (en) * | 2011-02-02 | 2012-08-23 | Ishigaki Co Ltd | Nitrogen removal system and nitrogen removal method for dehydration filtrate |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
| CN103984378A (en) * | 2013-07-18 | 2014-08-13 | 俞元洪 | Control apparatus suitable for mud rapid dehydration system |
-
1993
- 1993-04-20 JP JP5091713A patent/JPH06296978A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876574A (en) * | 1987-11-04 | 1989-10-24 | Canon Kabushiki Kaisha | Developing apparatus |
| JP2003080269A (en) * | 2001-09-07 | 2003-03-18 | Tohoku Electric Power Co Inc | Method for treating boron-containing water |
| JP2007069053A (en) * | 2005-09-02 | 2007-03-22 | Kobelco Eco-Solutions Co Ltd | Method and facility for treating organic sludge |
| JP2010264417A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| KR101033851B1 (en) * | 2010-07-09 | 2011-05-16 | 주식회사 호국이엔지 | Phosphorous removing apparatus |
| JP2012157836A (en) * | 2011-02-02 | 2012-08-23 | Ishigaki Co Ltd | Nitrogen removal system and nitrogen removal method for dehydration filtrate |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
| CN103984378A (en) * | 2013-07-18 | 2014-08-13 | 俞元洪 | Control apparatus suitable for mud rapid dehydration system |
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