JP6105409B2 - Coagulation sedimentation apparatus and coagulation sedimentation method - Google Patents

Coagulation sedimentation apparatus and coagulation sedimentation method Download PDF

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JP6105409B2
JP6105409B2 JP2013134152A JP2013134152A JP6105409B2 JP 6105409 B2 JP6105409 B2 JP 6105409B2 JP 2013134152 A JP2013134152 A JP 2013134152A JP 2013134152 A JP2013134152 A JP 2013134152A JP 6105409 B2 JP6105409 B2 JP 6105409B2
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知久　治之
治之 知久
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Sumitomo Heavy Industries Environment Co Ltd
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Description

本発明は、凝集沈殿装置及び凝集沈殿方法に関する。   The present invention relates to a coagulation sedimentation apparatus and a coagulation sedimentation method.

従来より、有機性排水の処理方法として、有機性排水に対して凝集剤を添加することで有機物を凝集沈殿させて分離する方法が知られている。この凝集沈殿方法においては、有機物を効果的に凝集沈殿させるために、凝集反応槽よりも前段において酸剤を添加してｐＨを低下させた上で脱気が行われると共に、凝集反応槽においては無機凝集剤とアルカリ剤とが添加される（例えば、特許文献１，２参照）。   2. Description of the Related Art Conventionally, as a method for treating organic wastewater, a method of coagulating and separating organic substances by adding a flocculant to organic wastewater is known. In this coagulation sedimentation method, in order to effectively coagulate and precipitate organic matter, degassing is performed after adding an acid agent and lowering the pH before the aggregation reaction tank, and in the aggregation reaction tank, An inorganic flocculant and an alkali agent are added (for example, refer to Patent Documents 1 and 2).

特開２００２−３５７６４号公報JP 2002-35764 A 特開２００８−１６１７３２号公報JP 2008-161732 A

しかしながら、近年有機性排水の処理に係るコストを低減することが望まれている。   However, in recent years, it has been desired to reduce the cost associated with the treatment of organic waste water.

本発明は上記を鑑みてなされたものであり、コスト低減が図られた凝集沈殿装置及び凝集沈殿方法を提供することを目的とする。   The present invention has been made in view of the above, and an object thereof is to provide a coagulation sedimentation apparatus and a coagulation sedimentation method in which cost reduction is achieved.

ここで、本発明者は、鋭意検討し以下の考察により本発明に至った。すなわち、従来技術において凝集反応槽において添加されていた無機凝集剤が酸性であることに着目し、従来脱気槽において添加されていた酸剤に代えて酸性の無機凝集剤を脱気槽において添加することにより、脱気槽における脱気を促進することができることを見出した。また、凝集反応槽においてｐＨを調整することによって処理水の凝集反応を促進させることができる点についても見出した。   Here, the present inventors diligently studied and arrived at the present invention through the following considerations. That is, paying attention to the fact that the inorganic flocculant added in the agglomeration reaction tank in the prior art is acidic, an acidic inorganic flocculant is added in the deaeration tank instead of the acid agent added in the conventional deaeration tank. By doing, it discovered that deaeration in a deaeration tank could be accelerated | stimulated. In addition, the inventors have found that the coagulation reaction of treated water can be promoted by adjusting the pH in the coagulation reaction tank.

そこで、本発明に係る凝集沈殿装置は、導入される有機性排水を脱気する脱気手段と、当該有機性排水に対して無機凝集剤を添加する無機凝集剤添加手段とが設けられた脱気槽と、前記脱気槽から導入される処理水を所望の範囲のｐＨに調整するｐＨ調整手段が設けられた凝集反応槽と、前記凝集反応槽から導入される処理水中の凝集フロックを沈降分離する沈殿槽と、を備えることを特徴とする。   Therefore, the coagulation sedimentation apparatus according to the present invention is a degassing unit provided with deaeration means for deaerating the introduced organic waste water and inorganic coagulant addition means for adding an inorganic coagulant to the organic waste water. An agglomeration reaction tank provided with a pH adjustment means for adjusting the pH of the treatment water introduced from the air tank and the deaeration tank to a desired range; and agglomeration floc in the treated water introduced from the agglomeration reaction tank And a settling tank for separation.

また、本発明に係る凝集沈殿方法は、脱気槽に導入される有機性排水を脱気手段により脱気し、当該有機性排水に対して無機凝集剤添加手段により無機凝集剤を添加する工程と、凝集反応槽において、ｐＨ調整手段により前記脱気槽から導入される処理水を所望の範囲のｐＨに調整する工程と、沈殿槽において、前記凝集反応槽から導入される処理水中の凝集フロックを沈降分離する工程と、を備えることを特徴とする。   In the coagulation sedimentation method according to the present invention, the organic wastewater introduced into the deaeration tank is degassed by the deaeration means, and the inorganic flocculant is added to the organic wastewater by the inorganic flocculant addition means. And a step of adjusting the treated water introduced from the deaeration tank by a pH adjusting means to a pH within a desired range in the agglomeration reaction tank, and a flocculent floc in the treated water introduced from the agglomeration reaction tank in the precipitation tank And a step of sedimentation separation.

上記の凝集沈殿装置及びその運転方法によれば、脱気槽において酸性の無機凝集剤が添加されることで、脱気槽における有機性排水のｐＨを低下させ、有機性排水の脱気を好適に行うことができる。また、凝集反応槽において処理水を所望の範囲のｐＨに調整することで凝集反応槽における凝集反応を好適に進めることができる。ここで、無機凝集剤を脱気槽で添加する構成とすることで従来脱気槽において添加されていた酸剤が不要となると共に、酸剤が添加されなくなったことで、従来の構成と比較して凝集反応槽において添加されるｐＨ調整剤（アルカリ剤）の量を低減することもでき、運転時の薬品コストの低減を達成することができる。   According to the above coagulation sedimentation apparatus and its operation method, the acidic inorganic flocculant is added in the deaeration tank, so that the pH of the organic waste water in the deaeration tank is lowered and the organic waste water is preferably deaerated. Can be done. Moreover, the coagulation reaction in the coagulation reaction tank can be suitably advanced by adjusting the treated water to a pH in a desired range in the coagulation reaction tank. Here, by adding the inorganic flocculant in the degassing tank, the acid agent that has been added in the conventional degassing tank becomes unnecessary, and the acid agent is no longer added. Thus, the amount of the pH adjusting agent (alkaline agent) added in the agglomeration reaction tank can be reduced, and the chemical cost during operation can be reduced.

また、前記脱気手段は、粗気泡型曝気装置である態様とすることができる。上記のように脱気手段として粗気泡型曝気装置を用いることで、脱気槽における脱気を好適に行うことができ、コスト低減が図られた凝集沈殿装置をより効率よく運転することが可能となる。   Moreover, the said deaeration means can be made into the aspect which is a coarse bubble type aeration apparatus. By using the coarse bubble type aeration apparatus as the deaeration means as described above, the deaeration in the deaeration tank can be suitably performed, and the coagulation sedimentation apparatus with reduced cost can be operated more efficiently. It becomes.

本発明によれば、コスト低減が図られた凝集沈殿装置及び凝集沈殿方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, the coagulation sedimentation apparatus and the coagulation sedimentation method in which cost reduction was achieved are provided.

本発明の実施形態に係る凝集沈殿装置の概略構成図である。It is a schematic block diagram of the coagulation sedimentation apparatus which concerns on embodiment of this invention.

以下、添付図面を参照して、本発明を実施するための形態を詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

図１は、本発明の実施形態に係る凝集沈殿装置の概略構成図である。図１に示すように、凝集沈殿装置１は、有機性排水が導入される脱気槽１０、凝集反応槽２０、及び沈殿槽３０をこの順に接続して備えると共に、脱気槽１０に対して被処理水を導入するラインＬ１、脱気槽１０からの処理水を凝集反応槽２０に対して導入するラインＬ２、凝集反応槽２０からの処理水を沈殿槽３０に対して導入するラインＬ３、沈殿槽３０からの処理水を外部に排出するラインＬ４、及び沈殿槽３０からの汚泥を外部に排出するラインＬ５を備える。   FIG. 1 is a schematic configuration diagram of a coagulation sedimentation apparatus according to an embodiment of the present invention. As shown in FIG. 1, the coagulation sedimentation apparatus 1 includes a deaeration tank 10 into which organic wastewater is introduced, an aggregation reaction tank 20, and a precipitation tank 30 connected in this order, and is connected to the deaeration tank 10. Line L1 for introducing the water to be treated, line L2 for introducing the treated water from the degassing tank 10 to the aggregation reaction tank 20, line L3 for introducing the treated water from the aggregation reaction tank 20 to the precipitation tank 30, A line L4 for discharging treated water from the settling tank 30 to the outside and a line L5 for discharging sludge from the settling tank 30 to the outside are provided.

脱気槽１０は、ラインＬ１を通して有機性排水が導入され、有機性排水中に含まれている気体を除去する槽である。脱気槽１０の底部には、脱気槽１０内の有機性排水の脱気を行うための脱気手段として、外部に設けられたブロワからの空気を粗気泡として槽内に供給する粗気泡型曝気装置１１が設けられている。粗気泡型曝気装置１１による脱気槽１０内の曝気量を１ＶＶＨ程度とすることで、脱気槽１０内の脱気を好適に行うことができる。   The deaeration tank 10 is a tank in which organic waste water is introduced through the line L1 and gas contained in the organic waste water is removed. At the bottom of the degassing tank 10, as a degassing means for degassing the organic waste water in the degassing tank 10, air from the blower provided outside is supplied into the tank as coarse bubbles. A mold aeration device 11 is provided. By setting the aeration amount in the deaeration tank 10 by the coarse bubble type aeration apparatus 11 to about 1 VVH, the deaeration in the deaeration tank 10 can be suitably performed.

また、脱気槽１０には、酸性の無機凝集剤を添加可能な無機凝集剤添加部１３が接続されている。無機凝集剤としては、硫酸バンドやＰＡＣ等のＡｌ系の無機凝集剤を用いてもよく、例えばＦｅ系の無機凝集剤を用いてもよく、要は、排水中の有機物と電気化学的反応する金属成分（ＡｌやＦｅ）とを有していればよい。また、酸性の無機凝集剤を有機性排水に添加することで、有機性排水のｐＨを低下させることができる。脱気槽１０内の有機性排水のｐＨを低下させることで、有機性排水からの脱気を促進することができ、特に脱炭酸を促進することができる。脱気（脱炭酸）の促進に適したｐＨは６未満であり、例えば４〜５．５である。   The deaeration tank 10 is connected to an inorganic flocculant addition unit 13 to which an acidic inorganic flocculant can be added. As the inorganic flocculant, an Al-based inorganic flocculant such as a sulfuric acid band or PAC may be used. For example, an Fe-based inorganic flocculant may be used. In short, it reacts electrochemically with organic matter in the waste water. What is necessary is just to have a metal component (Al and Fe). Moreover, pH of organic wastewater can be lowered | hung by adding an acidic inorganic flocculant to organic wastewater. By reducing the pH of the organic waste water in the deaeration tank 10, the deaeration from the organic waste water can be promoted, and in particular, the decarboxylation can be promoted. The pH suitable for promoting degassing (decarboxylation) is less than 6, for example, 4 to 5.5.

凝集反応槽２０は、脱気槽１０からの処理水がラインＬ２を通して導入され、当該処理水のｐＨを所望の値に調整することで、排水の凝集反応を進行させる槽である。凝集反応槽２０には、槽内の処理水を撹拌する撹拌羽根を備えた撹拌手段２１と、槽内の処理水のｐＨを測定するｐＨ計２３とが設けられると共に、ｐＨ計２３により測定される処理水のｐＨに基づいてアルカリ剤を添加するアルカリ剤添加部２５が接続されている。このｐＨ計２３及びアルカリ剤添加部２５が槽内の処理水のｐＨを調整するｐＨ調整手段として機能する。凝集反応槽２０においては、アルカリ剤添加部２５によってアルカリ剤を添加することで、無機凝集剤の添加による凝集フロックの生成が進み沈殿性が良くなるｐＨとなるように、ｐＨが上昇する方向に調整される。沈殿に適したｐＨは、例えば６〜８である。アルカリ剤添加部２５によって供給されるアルカリ剤として、例えば苛性ソーダ（ＮａＯＨ）や水酸化カルシウム（Ｃａ（ＯＨ）２）などを適用することができる。 The agglomeration reaction tank 20 is a tank in which treated water from the deaeration tank 10 is introduced through the line L2, and the pH of the treated water is adjusted to a desired value to advance the agglomeration reaction of waste water. The agglomeration reaction tank 20 is provided with a stirring means 21 having a stirring blade for stirring the treated water in the tank, and a pH meter 23 for measuring the pH of the treated water in the tank. An alkaline agent addition unit 25 for adding an alkaline agent based on the pH of the treated water is connected. The pH meter 23 and the alkaline agent addition unit 25 function as pH adjusting means for adjusting the pH of the treated water in the tank. In the agglomeration reaction tank 20, by adding an alkali agent by the alkali agent addition unit 25, the pH increases so that the formation of agglomeration flocs due to the addition of the inorganic flocculant advances and the precipitation becomes better. Adjusted. A suitable pH for precipitation is, for example, 6-8. For example, caustic soda (NaOH) or calcium hydroxide (Ca (OH) 2 ) can be applied as the alkaline agent supplied by the alkaline agent addition unit 25.

沈殿槽３０は、凝集反応槽２０からの凝集フロックを含む処理水がラインＬ３を通して導入されると共に、凝集フロックを沈降分離する槽である。沈降分離された凝集フロックは汚泥としてラインＬ５から排出されると共に、上澄液は処理水としてラインＬ４から排出される。なお、沈殿槽３０又はその上流側において、フロックを粗大化し沈降性を高めることを目的として高分子凝集剤を添加する構成としてもよい。   The settling tank 30 is a tank that settles and separates the aggregated flocs while the treated water containing the aggregated flocs from the aggregation reaction tank 20 is introduced through the line L3. The aggregated floc separated and separated is discharged from the line L5 as sludge, and the supernatant is discharged from the line L4 as treated water. In addition, it is good also as a structure which adds a polymer flocculant in the sedimentation tank 30 or the upstream side for the purpose of coarsening a floc and improving sedimentation property.

上記の凝集沈殿装置１では、まず、有機性排水がラインＬ１を通して脱気槽１０に導入されると、粗気泡型曝気装置１１の駆動により、有機性排水の脱気が行われる。また、無機凝集剤添加部１３により排水中に酸性の無機凝集剤が添加されることで、排水のｐＨが低下され、特に脱炭酸が促進される。次に、脱気槽１０からの処理水はラインＬ２を通して凝集反応槽２０に導入されると、撹拌手段２１により撹拌されながら、ｐＨ計２３によりｐＨを測定しながらアルカリ剤添加部２５によってアルカリ剤が添加されることで、処理水のｐＨが所望の値となるように調整され、これにより、排水中の凝集フロックの生成が促進される。そして、凝集フロックを含む処理水は、ラインＬ３を通して沈殿槽３０に導入されると、沈殿槽３０内で凝集フロックが沈降分離され、上澄液が処理水としてラインＬ４から排出されると共に沈降分離された凝集フロックが汚泥としてラインＬ５から排出される。   In the coagulation sedimentation apparatus 1, first, when organic wastewater is introduced into the deaeration tank 10 through the line L 1, the organic wastewater is deaerated by driving the coarse bubble aeration apparatus 11. Moreover, by adding an inorganic inorganic flocculant into the wastewater by the inorganic flocculant addition unit 13, the pH of the wastewater is lowered, and in particular, decarboxylation is promoted. Next, when the treated water from the deaeration tank 10 is introduced into the agglomeration reaction tank 20 through the line L2, the alkali agent is added by the alkali agent addition unit 25 while being measured by the pH meter 23 while being stirred by the stirring means 21. Is added so that the pH of the treated water is adjusted to a desired value, thereby promoting the formation of aggregated floc in the waste water. Then, when the treated water containing the flocculated floc is introduced into the sedimentation tank 30 through the line L3, the flocculated floc is settled and separated in the sedimentation tank 30, and the supernatant is discharged from the line L4 as treated water and settled and separated. The agglomerated floc is discharged from the line L5 as sludge.

ここで、本実施形態に係る凝集沈殿装置１の作用・効果について説明する。   Here, the operation and effect of the coagulation sedimentation apparatus 1 according to the present embodiment will be described.

従来の凝集沈殿装置では、有機物を効果的に凝集沈殿させるために、凝集反応槽よりも前段の例えば脱気槽において酸剤を添加してｐＨを低下させることで脱気処理を進行させた後、凝集反応槽において凝集フロックの生成を促進するためにｐＨを調整しながら無機凝集剤とアルカリ剤とを添加する構成であった。この場合、脱気槽においては脱気を促進するためにｐＨを低下させるための酸剤を添加する一方で、凝集反応槽においては無機凝集剤を添加すると共に凝集フロックの生成を促進するためのアルカリ剤を添加する必要があった。また、従来の凝集沈殿装置では、脱気を効率よく行うために、脱気槽の前段にｐＨ調整槽を別途設ける場合もあった。   In the conventional coagulation sedimentation device, in order to effectively coagulate and precipitate organic matter, after degassing treatment is advanced by adding an acid agent and lowering the pH in a degassing tank, for example, before the coagulation reaction tank In the agglomeration reaction tank, the inorganic aggregating agent and the alkali agent were added while adjusting the pH in order to promote the formation of agglomerated floc. In this case, in the deaeration tank, an acid agent for lowering the pH is added in order to promote degassing, while in the agglomeration reaction tank, an inorganic flocculant is added and the generation of agglomerated flocs is promoted. It was necessary to add an alkaline agent. Moreover, in the conventional coagulation sedimentation apparatus, in order to perform deaeration efficiently, the pH adjustment tank may be provided separately in the front | former stage of the deaeration tank.

これに対して、本実施形態に係る凝集沈殿装置１では、脱気槽１０において無機凝集剤添加部１３によって酸性の無機凝集剤が添加されることで、脱気槽１０における有機性排水のｐＨを低下させ、有機性排水の脱気を好適に行うことができる。また、凝集反応槽２０においてｐＨ調整手段（ｐＨ計２３及びアルカリ剤添加部２５）によって処理水を所望の範囲のｐＨに調整することで、凝集反応槽２０における凝集フロックの生成に係る凝集反応を好適に進めることができる。そしてこのような構成を有することで、従来脱気槽１０において添加されていた酸剤が不要となる。   On the other hand, in the coagulation sedimentation apparatus 1 according to this embodiment, the pH of the organic wastewater in the deaeration tank 10 is obtained by adding an acidic inorganic flocculant in the deaeration tank 10 by the inorganic flocculant addition unit 13. The organic waste water can be suitably degassed. Further, by adjusting the treated water to a pH within a desired range by a pH adjusting means (pH meter 23 and alkaline agent addition unit 25) in the aggregation reaction tank 20, the aggregation reaction related to the generation of the aggregation floc in the aggregation reaction tank 20 is performed. It can proceed suitably. And by having such a structure, the acid agent conventionally added in the deaeration tank 10 becomes unnecessary.

また、従来の構成によれば、酸剤によってｐＨが低く調整されていた処理水に対してさらに無機凝集剤を添加した後に、凝集反応を促進するためにアルカリ剤の添加によりｐＨを調整していた。これと比較して、本実施形態に係る凝集沈殿装置１では、脱気槽１０における酸剤の添加が不要となったことで、凝集反応を促進するためのｐＨの調整を目的として添加されるアルカリ剤の量を低減することもできた。すなわち、本実施形態に係る凝集沈殿装置１によれば、従来の凝集沈殿装置と比較して、酸剤が不要となると共にアルカリ剤の使用量を低減することができるため、凝集反応に係る性能を維持した上で、薬品コストの大幅な低減を達成することができる。また、脱気槽の前段にｐＨ調整槽を別途設ける構成と比較すると、脱気処理に係る設備の簡素化も達成することができる。   In addition, according to the conventional configuration, after further adding an inorganic flocculant to the treated water that has been adjusted to a low pH by the acid agent, the pH is adjusted by adding an alkali agent in order to promote the agglomeration reaction. It was. Compared with this, in the coagulation sedimentation apparatus 1 which concerns on this embodiment, since the addition of the acid agent in the deaeration tank 10 becomes unnecessary, it is added for the purpose of adjusting pH for promoting the coagulation reaction. It was also possible to reduce the amount of alkaline agent. That is, according to the coagulation sedimentation apparatus 1 according to the present embodiment, compared with the conventional coagulation sedimentation apparatus, an acid agent is not required and the amount of the alkali agent used can be reduced, so that the performance related to the coagulation reaction is achieved. In addition, a significant reduction in chemical costs can be achieved. Moreover, compared with the structure which provides a pH adjustment tank separately in the front | former stage of a deaeration tank, simplification of the installation which concerns on a deaeration process can also be achieved.

また、脱気槽１０に設けられる脱気手段として粗気泡型曝気装置１１を採用することにより、脱気槽１０における脱気、特に脱炭酸を好適に行うことができ、コスト低減が図られた凝集沈殿装置をより効率よく運転することが可能となる。   Further, by adopting the coarse bubble type aeration apparatus 11 as the deaeration means provided in the deaeration tank 10, the deaeration in the deaeration tank 10, particularly the decarboxylation can be suitably performed, and the cost can be reduced. It becomes possible to operate the coagulation sedimentation apparatus more efficiently.

以上、本発明の実施形態について説明したが、本発明は上述の実施形態に限定されるものではない。   As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment.

例えば、上記実施形態では、脱気手段として粗気泡型曝気装置１１を採用した構成について説明をしたが、例えば撹拌羽根を用いた撹拌装置等他の装置を脱気手段として用いる構成であってもよい。また、凝集反応槽２０に用いられる撹拌手段２１についても上述の撹拌羽根に限定されない。   For example, in the above-described embodiment, the configuration in which the coarse bubble type aeration apparatus 11 is used as the deaeration means has been described. However, for example, other apparatuses such as an agitation apparatus using a stirring blade may be used as the deaeration means. Good. Further, the stirring means 21 used in the agglomeration reaction tank 20 is not limited to the above-described stirring blade.

１…凝集沈殿装置、１０…脱気槽、１３…無機凝集剤添加部、２５…アルカリ剤添加部、２０…凝集反応槽、３０…沈殿槽、Ｌ１〜Ｌ５…ライン。

DESCRIPTION OF SYMBOLS 1 ... Coagulation precipitation apparatus, 10 ... Deaeration tank, 13 ... Inorganic flocculant addition part, 25 ... Alkaline agent addition part, 20 ... Agglomeration reaction tank, 30 ... Precipitation tank, L1-L5 ... Line.

Claims (3)

導入されるｐＨの調整が行われていない有機性排水を脱気する脱気手段と、当該有機性排水に対して、当該有機性排水を酸性状態にする無機凝集剤を添加する無機凝集剤添加手段とが設けられた脱気槽と、
前記脱気槽から導入される酸性状態の処理水を所望の範囲のｐＨに調整するｐＨ調整手段が設けられた凝集反応槽と、
前記凝集反応槽から導入される処理水中の凝集フロックを沈降分離する沈殿槽と、
を備える凝集沈殿装置。 Degassing means for degassing organic wastewater that has not been adjusted for pH, and inorganic flocculant addition for adding organic flocculant that makes the organic wastewater acidic to the organic wastewater A deaeration tank provided with means,
An agglomeration reaction tank provided with pH adjusting means for adjusting the acidic state treated water introduced from the deaeration tank to a pH within a desired range;
A settling tank for settling and separating the aggregated floc in the treated water introduced from the aggregation reaction tank;
A coagulating sedimentation apparatus. 前記脱気手段は、粗気泡型曝気装置である請求項１記載の凝集沈殿装置。   The coagulation sedimentation apparatus according to claim 1, wherein the deaeration means is a coarse bubble aeration apparatus. 脱気槽に導入されるｐＨの調整が行われていない有機性排水を脱気手段により脱気し、当該有機性排水に対して無機凝集剤添加手段により、当該有機性排水を酸性状態にする無機凝集剤を添加する工程と、
凝集反応槽において、前記脱気槽から導入される酸性状態の処理水をｐＨ調整手段により所望の範囲のｐＨに調整する工程と、
沈殿槽において、前記凝集反応槽から導入される処理水中の凝集フロックを沈降分離する工程と、
を備える凝集沈殿方法。 The organic wastewater that has not been adjusted for pH introduced into the degassing tank is degassed by the degassing means, and the organic wastewater is made acidic by the inorganic flocculant addition means with respect to the organic wastewater. Adding an inorganic flocculant;
In the agglomeration reaction tank, a step of adjusting the treated water in an acidic state introduced from the deaeration tank to a pH in a desired range by a pH adjusting means;
In the settling tank, a step of settling and separating the aggregated floc in the treated water introduced from the aggregation reaction tank;
A coagulation precipitation method comprising:
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