JPH1034199A - Treatment of tap water sludge - Google Patents
Treatment of tap water sludgeInfo
- Publication number
- JPH1034199A JPH1034199A JP8194693A JP19469396A JPH1034199A JP H1034199 A JPH1034199 A JP H1034199A JP 8194693 A JP8194693 A JP 8194693A JP 19469396 A JP19469396 A JP 19469396A JP H1034199 A JPH1034199 A JP H1034199A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- aluminum sulfate
- acid treatment
- aluminum
- sulfate solution
- 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
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- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、浄水場から排出さ
れる上水汚泥の処理法に関する。The present invention relates to a method for treating water sludge discharged from a water treatment plant.
【０００２】[0002]
【従来の技術】図３に、一般的な浄水場における汚泥処
理法を示す。図で、１は混和池、２はフロック形成池、
３は沈殿池、４は汚泥濃縮槽、８は汚泥貯留槽、９は脱
水機、１１は急速濾過池、１２は滅菌槽を表す。2. Description of the Related Art FIG. 3 shows a method of treating sludge in a general water purification plant. In the figure, 1 is a mixing pond, 2 is a floc formation pond,
Reference numeral 3 denotes a sedimentation tank, 4 denotes a sludge thickening tank, 8 denotes a sludge storage tank, 9 denotes a dehydrator, 11 denotes a rapid filtration pond, and 12 denotes a sterilization tank.
【０００３】通常、浄水場においては図３に示すような
工程を経て、上水汚泥が処理される。すなわち、河川、
貯水池、井戸から取水された原水は混和池１に導かれ、
そこでＰＡＣ（ポリ塩化アルミニウム）あるいは硫酸ア
ルミニウム（硫酸ばん土）の凝集剤が添加された後フロ
ック形成池２へ送られる。フロック形成池２では懸濁質
がフロック化され、このフロック化された懸濁質は次の
沈殿池３で沈降し上水汚泥となる。この上水汚泥は汚泥
濃縮槽４で重力沈降分離法により濃縮され、汚泥貯留槽
８に貯留され、脱水機９により脱水されて固形物の脱水
ケーキとなる。[0003] Normally, in a water purification plant, water sludge is treated through a process as shown in FIG. That is, rivers,
Raw water taken from reservoirs and wells is led to mixing pond 1,
Then, a flocculant such as PAC (polyaluminum chloride) or aluminum sulfate (sulfuric acid earth) is added and then sent to the floc forming pond 2. The suspended solids are flocculated in the floc forming pond 2, and the flocculated suspended solids settle in the next sedimentation pond 3 and become water sludge. The clean water sludge is concentrated in the sludge concentration tank 4 by gravity sedimentation, stored in the sludge storage tank 8 and dewatered by the dewatering machine 9 to become a solid dewatered cake.
【０００４】一方、沈殿池３の上澄水は急速濾過池１１
で砂濾過され、滅菌槽１２で塩素滅菌され上水となる。On the other hand, the supernatant water of the sedimentation basin 3 is supplied to the rapid filtration basin 11.
, And is sterilized with chlorine in the sterilization tank 12 to become clean water.
【０００５】このような一般的な汚泥処理法で排出され
る上水汚泥は凝集剤に起因する水酸化アルミニウムを含
むため非常に脱水性が悪く、脱水機の処理能力を低下さ
せる。そこで脱水性を改善するために、濃縮された汚泥
を硫酸を用いて酸処理する方法が提案されており、実際
にいくつかの浄水場で採用されている。[0005] Water sludge discharged by such a general sludge treatment method has very poor dewaterability because it contains aluminum hydroxide caused by a coagulant, and reduces the treatment capacity of a dewatering machine. Therefore, in order to improve the dewatering property, a method of treating concentrated sludge with acid using sulfuric acid has been proposed, and is actually employed in some water purification plants.
【０００６】図４に、酸処理工程の付加された浄水場の
汚泥処理法の１例を示す。図で、図３と同じ番号は図３
と同じものを表し、６は酸処理槽、１０は再生ばん土
（後述）貯留槽を表す。FIG. 4 shows an example of a sludge treatment method in a water purification plant to which an acid treatment step is added. In the drawing, the same numbers as those in FIG.
And 6 represents an acid treatment tank and 10 represents a reclaimed soil (described later) storage tank.
【０００７】汚泥濃縮槽４で濃縮された汚泥は、通常、
固形物重量濃度が０．５〜３％程度のスラリー状のもの
であるが、酸処理槽６でｐＨを２前後に調整して硫酸と
反応させると、汚泥中のアルミニウムは硫酸アルミニウ
ムとして溶出するので、汚泥の脱水性が改善される。The sludge concentrated in the sludge concentration tank 4 is usually
Although the slurry is a slurry having a solid matter weight concentration of about 0.5 to 3%, when the pH is adjusted to about 2 in the acid treatment tank 6 and reacted with sulfuric acid, aluminum in the sludge is eluted as aluminum sulfate. Therefore, the dewatering property of the sludge is improved.
【０００８】汚泥は酸処理槽６内で重力沈降分離法によ
り硫酸アルミニウムの溶出した上澄水（再生ばん土と呼
ばれる）と分離されるが、この上澄水は回収され、再生
ばん土貯留槽１０に貯留され凝集剤として再利用され
る。また、酸処理槽６で沈降した脱水性の改善された汚
泥は、消石灰などのアルカリで中和処理後汚泥貯留槽８
に貯留され脱水機９により脱水されて固形物の脱水ケー
キとなる。The sludge is separated from the supernatant water (referred to as reclaimed soil) from which aluminum sulfate has been eluted by gravity sedimentation in the acid treatment tank 6, and the supernatant water is recovered and stored in the reclaimed soil storage tank 10. It is stored and reused as a flocculant. The sludge settled in the acid treatment tank 6 and having improved dehydration property is neutralized with an alkali such as slaked lime, and the sludge storage tank 8
And is dehydrated by the dehydrator 9 to form a solid dehydrated cake.
【０００９】こうした酸処理工程の付加された汚泥処理
法においては、汚泥の脱水性は改善されるものの、以下
に示すような問題がある。In the sludge treatment method to which such an acid treatment step is added, although the dewatering property of the sludge is improved, there are the following problems.
【００１０】ｉ）酸処理で排出される硫酸アルミニウム
溶液のアルミニウム濃度はＡｌ2 Ｏ 3 換算で０．３％前
後と希薄なため、汚泥からアルミニウムを除去するには
大量の硫酸アルミニウム溶液が排出されることになる
が、そのためには容量の大きな酸処理槽や再生ばん土貯
留槽が必要となり、コストや設置場所の問題が生じる。I) Aluminum sulfate discharged by acid treatment
The aluminum concentration of the solution is AlTwoO Three0.3% before conversion
To remove aluminum from sludge because it is lean and late
A large amount of aluminum sulfate solution will be discharged
However, for this purpose, large-capacity acid treatment tanks and recycled soil storage
A reservoir is required, which causes problems in cost and installation location.
【００１１】ｉｉ）酸処理で排出される硫酸アルミニウ
ム溶液を凝集剤として再利用するときには、アルミニウ
ム濃度を調整してから再利用する必要がある。しかし、
排出される硫酸アルミニウム溶液のアルミニウム濃度は
Ａｌ2 Ｏ3 換算で０．３％前後と低いため、濃度調整が
困難である。Ii) When the aluminum sulfate solution discharged in the acid treatment is reused as a flocculant, it is necessary to adjust the aluminum concentration and then reuse it. But,
Since the aluminum concentration of the discharged aluminum sulfate solution is as low as about 0.3% in terms of Al 2 O 3, it is difficult to adjust the concentration.
【００１２】そのため、酸処理で排出される硫酸アルミ
ニウム溶液のアルミニウム濃度を高濃度化するべく、特
開昭６３ー２５２５９９号公報や特公昭６３ー５３１３
１号公報には、酸処理前の汚泥の濃度を高める方法が提
案されている。Therefore, in order to increase the aluminum concentration of the aluminum sulfate solution discharged by the acid treatment, Japanese Patent Application Laid-Open No. Sho 63-252599 and Japanese Patent Publication No. Sho 63-5313 have been proposed.
No. 1 proposes a method for increasing the concentration of sludge before acid treatment.
【００１３】[0013]
【発明が解決しようとする課題】しかしながら、酸処理
前の汚泥の濃度を高めると酸処理時の汚泥の粘度が高く
なり、酸処理時の攪拌が困難になるとともに重力沈降分
離性が著しく低下する。However, if the concentration of the sludge before the acid treatment is increased, the viscosity of the sludge at the time of the acid treatment becomes high, and the stirring at the time of the acid treatment becomes difficult, and the sedimentation by gravity sedimentation is remarkably reduced. .
【００１４】そのため、特開昭６３ー２５２５９９号公
報に記載の方法では、汚泥の粘度に上限を設けており、
上限以上の粘度になった場合は、希釈する手段が講じら
れているが、水などにより希釈すれば硫酸アルミニウム
溶液のアルミニウム濃度は低下する。Therefore, in the method described in JP-A-63-252599, an upper limit is set for the viscosity of sludge.
When the viscosity exceeds the upper limit, a means for diluting is taken, but if diluted with water or the like, the aluminum concentration of the aluminum sulfate solution decreases.
【００１５】したがって、硫酸アルミニウム溶液のアル
ミニウム濃度の高濃度化には限界があり、Ａｌ2 Ｏ3 換
算で高々１％前後の高濃度化が図れるにすぎない。Therefore, there is a limit in increasing the aluminum concentration of the aluminum sulfate solution, and it is only possible to increase the aluminum concentration to about 1% at most in terms of Al 2 O 3 .
【００１６】本発明はこのような課題を解決するために
なされたものであり、酸処理で排出される硫酸アルミニ
ウム溶液のアルミニウム濃度をＡｌ2 Ｏ3 換算で１％を
超えて高濃度化できる上水汚泥の処理法を提供すること
を目的とする。The present invention has been made to solve such a problem, and can increase the aluminum concentration of an aluminum sulfate solution discharged by acid treatment to more than 1% in terms of Al 2 O 3. An object of the present invention is to provide a method for treating water sludge.
【００１７】[0017]
【課題を解決するための手段】上記課題は、上水用原水
にアルミニウムを含む凝集剤を添加し懸濁質を沈降させ
て汚泥を形成する工程と、前記汚泥を濃縮する工程と、
前記濃縮汚泥を酸処理する工程と、前記酸処理後に硫酸
アルミニウム溶液と汚泥を分離する工程と、前記硫酸ア
ルミニウム溶液を回収する工程と、前記酸処理された汚
泥を中和処理後脱水処理する工程とを有してなる上水汚
泥の処理法において、前記濃縮汚泥を酸処理する時に所
定の濃度の硫酸アルミニウム溶液を添加することを特徴
とする上水汚泥の処理法により解決される。Means for Solving the Problems The object is to add a coagulant containing aluminum to raw water for tap water to settle suspended matter to form sludge, and to concentrate the sludge;
An acid treatment of the concentrated sludge, a step of separating the aluminum sulfate solution and the sludge after the acid treatment, a step of recovering the aluminum sulfate solution, and a step of neutralizing and dehydrating the acid-treated sludge In the method for treating water sludge, the method is characterized in that an aluminum sulfate solution having a predetermined concentration is added when the concentrated sludge is acid-treated.
【００１８】酸処理で排出される硫酸アルミニウム溶液
のアルミニウム濃度をＡｌ2 Ｏ3 換算で１％を超え得る
ほどに濃縮された汚泥を酸処理するとき、所定の濃度の
硫酸アルミニウム溶液を添加して汚泥を希釈しその粘度
低下を図れば、酸処理後に得られる硫酸アルミニウム溶
液のアルミニウム濃度が低下することはない。また、汚
泥の粘度が低いので酸処理時の攪拌や重力沈降分離も容
易に行える。When the sludge concentrated so that the aluminum concentration of the aluminum sulfate solution discharged by the acid treatment can exceed 1% in terms of Al 2 O 3 is acid-treated, an aluminum sulfate solution having a predetermined concentration is added. If the sludge is diluted to lower its viscosity, the aluminum concentration of the aluminum sulfate solution obtained after the acid treatment does not decrease. Further, since the viscosity of the sludge is low, stirring during acid treatment and sedimentation by gravity can be easily performed.
【００１９】なお、添加する硫酸アルミニウム溶液の濃
度は、酸処理前の汚泥の濃縮度に合わせ酸処理で排出さ
れる硫酸アルミニウム溶液のアルミニウム濃度がＡｌ2
Ｏ3換算で１％を超え得るような濃度にすればよい。The concentration of the aluminum sulfate solution to be added depends on the concentration of the sludge before the acid treatment and the aluminum concentration of the aluminum sulfate solution discharged by the acid treatment is Al 2.
The concentration may be such that it can exceed 1% in terms of O 3 .
【００２０】添加する硫酸アルミニウム溶液として、本
発明法で酸処理後に回収された硫酸アルミニウム溶液を
用いればより経済的である。It is more economical to use the aluminum sulfate solution recovered after the acid treatment in the method of the present invention as the aluminum sulfate solution to be added.
【００２１】酸処理前の濃縮汚泥にさらに濾過処理また
は遠心分離処理を施すと、より高濃度の汚泥が得られる
ため、硫酸アルミニウム溶液のアルミニウム濃度を高濃
度化できる。If the concentrated sludge before the acid treatment is further subjected to a filtration treatment or a centrifugation treatment, a higher concentration of the sludge can be obtained, so that the aluminum concentration of the aluminum sulfate solution can be increased.
【００２２】酸処理後に汚泥と硫酸アルミニウム溶液を
分離するには、従来の重力沈降分離法で行うより濾過処
理または遠心分離処理で行う方が効率的であり、分離能
も優れている。In order to separate the sludge and the aluminum sulfate solution after the acid treatment, it is more efficient to carry out the filtration or centrifugation treatment than to carry out the conventional gravity sedimentation method, and the separation ability is excellent.
【００２３】[0023]
【発明の実施の形態】濾過処理や遠心分離処理には、遠
心濃縮機、遠心脱水機、加圧脱水機、ベルトプレス脱水
機などを用いることができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS For filtration and centrifugation, a centrifugal concentrator, a centrifugal dehydrator, a pressure dehydrator, a belt press dehydrator and the like can be used.
【００２４】酸処理に用いる硫酸の濃度は９０％以上に
することが好ましいが、９６％以上にすることがより好
ましい。The concentration of sulfuric acid used in the acid treatment is preferably at least 90%, more preferably at least 96%.
【００２５】酸処理槽のｐＨは５以下にすることが好ま
しいが、１〜３にすることがより好ましい。The pH of the acid treatment tank is preferably adjusted to 5 or less, more preferably 1 to 3.
【００２６】中和するためのアルカリとして、消石灰の
他、カセイソーダや生石灰を用いることができる。As an alkali for neutralization, caustic soda or quicklime can be used in addition to slaked lime.
【００２７】[0027]
（実施例１）図１に、本発明の上水汚泥処理法の１実施
例を示す。図で、１は混和池、２はフロック形成池、３
は沈殿池、４は汚泥濃縮槽、５は加圧脱水機、６は酸処
理槽、７ａは真空脱水機、８は汚泥貯留槽、９は脱水
機、１０は再生ばん土貯留槽、１１は急速濾過池、１２
は滅菌槽を表す。(Embodiment 1) FIG. 1 shows an embodiment of the method for treating water sludge of the present invention. In the figure, 1 is a mixing pond, 2 is a floc formation pond, 3
Is a sedimentation tank, 4 is a sludge thickening tank, 5 is a pressure dehydrator, 6 is an acid treatment tank, 7a is a vacuum dehydrator, 8 is a sludge storage tank, 9 is a dehydrator, 10 is a reclaimed soil storage tank, and 11 is Rapid filtration pond, 12
Represents a sterilization tank.
【００２８】取水した原水に混和池１でＰＡＣを加えて
混合し、フロック形成池２で懸濁質をフロック化した
後、沈殿池３で沈降させた。この沈降した汚泥を汚泥濃
縮槽４で重力沈降させて固形物重量濃度１％の濃縮汚泥
を得た。この濃縮汚泥を加圧脱水機５で濃縮処理したと
ころ固形物重量濃度４６％の濃縮汚泥を得た。この濃縮
汚泥を酸処理槽６へ投入して酸処理を行った。酸処理
は、９８％の濃硫酸に次工程で回収される硫酸アルニウ
ム溶液を加え、ｐＨを２に調整し１時間攪拌して行っ
た。得られた混合液を真空脱水機７ａに送り脱水処理
し、硫酸アルニウム溶液と汚泥を分離した。硫酸アルミ
ニウム溶液中のアルミニウム濃度を測定したところ、Ａ
ｌ2 Ｏ3 換算で１２％であった。PAC was added to the raw water that had been withdrawn and mixed in the mixing pond 1, the suspended matter was flocculated in the floc forming pond 2, and the sediment was settled in the sedimentation pond 3. The settled sludge was settled by gravity in the sludge concentration tank 4 to obtain a concentrated sludge having a solid concentration of 1% by weight. When the concentrated sludge was concentrated by the pressure dehydrator 5, a concentrated sludge having a solid concentration by weight of 46% was obtained. The concentrated sludge was charged into the acid treatment tank 6 to perform an acid treatment. The acid treatment was performed by adding an alium sulfate solution recovered in the next step to 98% concentrated sulfuric acid, adjusting the pH to 2, and stirring for 1 hour. The obtained mixed solution was sent to a vacuum dehydrator 7a to be subjected to a dehydration treatment, whereby an aluminum sulfate solution and sludge were separated. When the aluminum concentration in the aluminum sulfate solution was measured, A
It was 12% in terms of l 2 O 3 .
【００２９】同じ原水を図４の従来法で処理した得られ
た硫酸アルミニウム溶液中のアルミニウム濃度はＡｌ2
Ｏ3 換算で０．３％であった。The aluminum concentration of the prior art treated with the resulting aluminum sulfate solution of 4 the same raw water Al 2
It was 0.3% in terms of O 3 .
【００３０】したがって、本発明法により硫酸アルミニ
ウム溶液中のアルミニウム濃度を、従来法に比べ約４０
倍に高濃度化することが可能になった。Therefore, according to the method of the present invention, the aluminum concentration in the aluminum sulfate solution is reduced by about 40 times compared with the conventional method.
It became possible to double the concentration.
【００３１】こうして得られた硫酸アルミニウム溶液の
一部は上述のように酸処理に利用され、残りは再生ばん
土貯留槽１０に貯留され凝集剤として再利用される。A part of the aluminum sulfate solution thus obtained is used for the acid treatment as described above, and the rest is stored in the reclaimed soil storage tank 10 and reused as a flocculant.
【００３２】一方、酸処理後硫酸アルミニウム溶液と分
離された汚泥はカセイソーダで中和後汚泥貯留槽８に貯
留され脱水機９で脱水されて脱水ケーキとなる。On the other hand, the sludge separated from the aluminum sulfate solution after the acid treatment is neutralized with caustic soda, stored in a sludge storage tank 8 and dewatered by a dehydrator 9 to form a dewatered cake.
【００３３】（実施例２）図２に、本発明の上水汚泥処
理法の別の１実施例を示す。図で、１は混和池、２はフ
ロック形成池、３は沈殿池、４は汚泥濃縮槽、５は加圧
脱水機、６は酸処理槽、７ｂは加圧脱水機、８は汚泥貯
留槽、９は脱水機、１０は再生ばん土貯留槽、１１は急
速濾過池、１２は滅菌槽を表す。(Embodiment 2) FIG. 2 shows another embodiment of the method for treating water sludge of the present invention. In the figure, 1 is a mixing pond, 2 is a floc forming pond, 3 is a sedimentation pond, 4 is a sludge thickening tank, 5 is a pressurized dehydrator, 6 is an acid treatment tank, 7b is a pressurized dehydrator, and 8 is a sludge storage tank. , 9 is a dehydrator, 10 is a reclaimed soil storage tank, 11 is a rapid filtration pond, and 12 is a sterilization tank.
【００３４】実施例１と同様な処理を経て、汚泥濃縮槽
４では固形物重量濃度１％の濃縮汚泥を得た。この濃縮
汚泥を加圧脱水機５で脱水処理したところ固形物重量濃
度４６％の濃縮汚泥を得た。この濃縮汚泥を酸処理槽６
へ投入して酸処理を行った。酸処理は、９８％の濃硫酸
に次工程で回収される硫酸アルニウム溶液を加え、ｐＨ
を２に調整し１時間攪拌して行った。得られた混合液を
加圧脱水機７ｂで濾過処理し、硫酸アルニウム溶液と汚
泥を分離した。硫酸アルミニウム溶液中のアルミニウム
濃度を測定したところ、Ａｌ2 Ｏ3 換算で１０％であっ
た。Through the same treatment as in Example 1, concentrated sludge having a solid weight concentration of 1% was obtained in the sludge concentration tank 4. When the concentrated sludge was dehydrated by the pressurized dehydrator 5, a concentrated sludge having a solid matter weight concentration of 46% was obtained. The concentrated sludge is converted into an acid treatment tank 6
To perform acid treatment. In the acid treatment, add 98% concentrated sulfuric acid to the solution of alnium sulfate recovered in the next step, and adjust the pH.
Was adjusted to 2 and stirred for 1 hour. The obtained mixed solution was subjected to a filtration treatment with a pressure dehydrator 7b to separate an aluminum sulfate solution and sludge. When the aluminum concentration in the aluminum sulfate solution was measured, it was 10% in terms of Al 2 O 3 .
【００３５】同じ原水を図４の従来法で処理した得られ
た硫酸アルミニウム溶液中のアルミニウム濃度はＡｌ2
Ｏ3 換算で０．３％であった。The aluminum concentration of the prior art treated with the resulting aluminum sulfate solution of 4 the same raw water Al 2
It was 0.3% in terms of O 3 .
【００３６】したがって、本発明法により硫酸アルミニ
ウム溶液中のアルミニウム濃度を、従来法に比べ約３３
倍に高濃度化することが可能になった。Therefore, according to the method of the present invention, the aluminum concentration in the aluminum sulfate solution is reduced by about 33
It became possible to double the concentration.
【００３７】こうして得られた硫酸アルミニウム溶液の
一部は上述のように酸処理に利用され、残りは再生ばん
土貯留槽１０に貯留され下水処理剤として再利用され
る。A part of the aluminum sulfate solution thus obtained is used for the acid treatment as described above, and the rest is stored in the reclaimed soil storage tank 10 and reused as a sewage treatment agent.
【００３８】一方、酸処理後硫酸アルミニウム溶液と分
離された汚泥は実施例１と同様に処理されて脱水ケーキ
となる。On the other hand, the sludge separated from the aluminum sulfate solution after the acid treatment is treated in the same manner as in Example 1 to form a dewatered cake.
【００３９】[0039]
【発明の効果】本発明は以上説明したように構成されて
いるので、酸処理で排出される硫酸アルミニウム溶液の
アルミニウム濃度をＡｌ2 Ｏ3 換算で１％を超えて高濃
度化できる上水汚泥の処理法を提供できる。Since the present invention is constructed as described above, water sludge capable of increasing the aluminum concentration of the aluminum sulfate solution discharged by the acid treatment to more than 1% in terms of Al 2 O 3 can be obtained. Can be provided.
【００４０】実際、本発明法によれば、硫酸アルミニウ
ム溶液中のアルミニウム濃度を従来法に比べ３０倍以上
に高濃度化できるので、酸処理槽や再生ばん土貯留槽の
容量を著しくコンパクト化できる。In fact, according to the method of the present invention, the aluminum concentration in the aluminum sulfate solution can be increased 30 times or more as compared with the conventional method, so that the capacity of the acid treatment tank or the reclaimed soil storage tank can be remarkably reduced. .
【００４１】また、再生ばん土を浄水場で凝集剤として
再利用する場合、アルミニウム濃度が高いので供給量が
少なくてすむため供給用のポンプ容量を小さくでき、ア
ルミニウム濃度の調整も容易になる。Further, when the recycled soil is reused as a flocculant in a water purification plant, since the aluminum concentration is high, the supply amount is small, so that the supply pump capacity can be reduced, and the adjustment of the aluminum concentration becomes easy.
【００４２】さらに、再生ばん土を下水処理場で下水の
脱リン処理剤として再利用する場合、アルミニウム濃度
が高いので脱リン処理に必要な量は少なくてすむため、
浄水場から下水処理場へ輸送する費用を従来の場合に比
べ大幅に低減できる。Further, when the recycled soil is reused as a sewage dephosphorizing agent in a sewage treatment plant, the amount required for the dephosphorizing treatment can be reduced due to the high aluminum concentration.
The cost of transporting from a water treatment plant to a sewage treatment plant can be significantly reduced compared to the conventional case.
【００４３】本発明法により処理れた上水汚泥はアルミ
ニウム含有量が非常に少ないため、園芸用土や建設用土
に好適である。The water sludge treated by the method of the present invention is very suitable for horticultural soil and construction soil because it has a very low aluminum content.
【図１】本発明の上水汚泥処理法の１実施例を示す図で
ある。FIG. 1 is a view showing one embodiment of a method for treating water sludge of the present invention.
【図２】本発明の上水汚泥処理法の別の１実施例を示す
図である。FIG. 2 is a view showing another embodiment of the clean water sludge treatment method of the present invention.
【図３】一般的な浄水場における汚泥処理法を示す図で
ある。FIG. 3 is a diagram showing a sludge treatment method in a general water purification plant.
【図４】酸処理工程の付加された浄水場の汚泥処理法の
１例を示す図である。FIG. 4 is a diagram showing an example of a sludge treatment method in a water purification plant to which an acid treatment step has been added.
１ 混和池 ２ フロック形成池 ３ 沈殿池 ４ 汚泥濃縮槽 ５ 加圧脱水機 ６ 酸処理槽 ７ａ 真空脱水機 ７ｂ 加圧脱水機 ８ 汚泥貯留槽 ９ 脱水機 １０ 再生ばん土貯留槽 １１ 急速濾過池 １２ 滅菌槽 DESCRIPTION OF SYMBOLS 1 Mixing pond 2 Floc formation pond 3 Settling pond 4 Sludge thickening tank 5 Pressure dehydrator 6 Acid treatment tank 7a Vacuum dehydrator 7b Pressure dehydrator 8 Sludge storage tank 9 Dehydrator 10 Recycled soil storage tank 11 Rapid filtration pond 12 Sterilization tank
Claims (4)
を添加し懸濁質を沈降させて汚泥を形成する工程と、前
記汚泥を濃縮する工程と、前記濃縮汚泥を酸処理する工
程と、前記酸処理後に硫酸アルミニウム溶液と汚泥を分
離する工程と、前記硫酸アルミニウム溶液を回収する工
程と、前記酸処理された汚泥を中和処理後脱水処理する
工程とを有してなる上水汚泥の処理法において、前記濃
縮汚泥を酸処理する時に硫酸アルミニウム溶液を添加す
ることを特徴とする上水汚泥の処理法。1. A step of adding a coagulant containing aluminum to raw water for tap water to settle a suspended solid to form sludge, a step of concentrating the sludge, and an acid treatment of the concentrated sludge; A step of separating the aluminum sulfate solution and the sludge after the acid treatment, a step of recovering the aluminum sulfate solution, and a step of neutralizing and dehydrating the acid-treated sludge; In the treatment method, an aluminum sulfate solution is added when the concentrated sludge is treated with an acid.
ム溶液として、前記回収された硫酸アルミニウム溶液を
用いることを特徴とする請求項１に記載の上水汚泥の処
理法。2. The method according to claim 1, wherein the recovered aluminum sulfate solution is used as the aluminum sulfate solution added during the acid treatment.
縮汚泥を濾過処理または遠心分離処理することを特徴と
する請求項１または請求項２に記載の上水汚泥の処理
法。3. The method for treating clean water sludge according to claim 1, wherein the concentrated sludge is filtered or centrifuged before the concentrated sludge is acid-treated.
液と汚泥の分離を濾過処理または遠心分離処理で行うこ
とを特徴とする請求項１から請求項３のいずれか１項に
記載の上水汚泥の処理法。4. The clean water sludge according to claim 1, wherein the separation of the aluminum sulfate solution and the sludge after the acid treatment is performed by filtration or centrifugation. Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8194693A JPH1034199A (en) | 1996-07-24 | 1996-07-24 | Treatment of tap water sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8194693A JPH1034199A (en) | 1996-07-24 | 1996-07-24 | Treatment of tap water sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1034199A true JPH1034199A (en) | 1998-02-10 |
Family
ID=16328715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8194693A Pending JPH1034199A (en) | 1996-07-24 | 1996-07-24 | Treatment of tap water sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1034199A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1013615A2 (en) * | 1998-12-22 | 2000-06-28 | Sociedad General de Aguas de Barcelona, S.A. | Procedure for obtaining a pulverulent product from the reject fraction of a water potabilization plant, the product obtained through such a procedure and the use of that product |
| KR100987011B1 (en) | 2009-10-12 | 2010-10-11 | 주식회사한국지씨엠 | River purification structure |
| WO2015155631A1 (en) * | 2014-04-07 | 2015-10-15 | 3E Nutrition Limited | Waste material process and product |
| US10272481B2 (en) * | 2017-05-23 | 2019-04-30 | Wenzhou University | System for consolidating hydraulic reclamation silt by combined flocculation and deep boosted vacuum preloading, and method for consolidating hydraulic reclamation silt |
| JP2020185504A (en) * | 2019-05-10 | 2020-11-19 | 株式会社北▲りょう▼ | Sludge treatment method and apparatus thereof |
| CN112816655A (en) * | 2020-12-22 | 2021-05-18 | 山西大学 | Soil profile reconstruction method for ecological restoration |
-
1996
- 1996-07-24 JP JP8194693A patent/JPH1034199A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1013615A2 (en) * | 1998-12-22 | 2000-06-28 | Sociedad General de Aguas de Barcelona, S.A. | Procedure for obtaining a pulverulent product from the reject fraction of a water potabilization plant, the product obtained through such a procedure and the use of that product |
| EP1013615A3 (en) * | 1998-12-22 | 2002-06-05 | Sociedad General de Aguas de Barcelona, S.A. | Procedure for obtaining a pulverulent product from the reject fraction of a water potabilization plant, the product obtained through such a procedure and the use of that product |
| KR100987011B1 (en) | 2009-10-12 | 2010-10-11 | 주식회사한국지씨엠 | River purification structure |
| WO2015155631A1 (en) * | 2014-04-07 | 2015-10-15 | 3E Nutrition Limited | Waste material process and product |
| US10272481B2 (en) * | 2017-05-23 | 2019-04-30 | Wenzhou University | System for consolidating hydraulic reclamation silt by combined flocculation and deep boosted vacuum preloading, and method for consolidating hydraulic reclamation silt |
| JP2020185504A (en) * | 2019-05-10 | 2020-11-19 | 株式会社北▲りょう▼ | Sludge treatment method and apparatus thereof |
| CN112816655A (en) * | 2020-12-22 | 2021-05-18 | 山西大学 | Soil profile reconstruction method for ecological restoration |
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