JP3271315B2 - Wastewater treatment method - Google Patents
Wastewater treatment methodInfo
- Publication number
- JP3271315B2 JP3271315B2 JP20999292A JP20999292A JP3271315B2 JP 3271315 B2 JP3271315 B2 JP 3271315B2 JP 20999292 A JP20999292 A JP 20999292A JP 20999292 A JP20999292 A JP 20999292A JP 3271315 B2 JP3271315 B2 JP 3271315B2
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- Prior art keywords
- tank
- anaerobic
- wastewater
- anaerobic tank
- returned
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は廃水の処理方法に係り、
特に、廃水を嫌気槽、（脱窒槽）、好気槽及び沈殿槽の
順に通水することにより、廃水中のＢＯＤ成分、（窒素
成分）及びリン成分を生物学的に除去する方法におい
て、脱リン効率の向上を図る方法に関する。The present invention relates to a method for treating wastewater,
In particular, by passing wastewater through an anaerobic tank, a (denitrification tank), an aerobic tank, and a sedimentation tank in this order, the BOD component, the (nitrogen component) and the phosphorus component in the wastewater are biologically removed. The present invention relates to a method for improving phosphorus efficiency.
【０００２】[0002]
【従来の技術】従来、廃水の生物学的脱リン処理は、嫌
気槽と好気槽とを組み合せて、更には脱窒槽を組み合せ
て行なわれており、嫌気槽への硝酸の流入を防止する方
法（ＵＣＴプロセス）及び、廃水中のＳＳを有機酸醗酵
させてリン除去効率を高める方法（Ｂａｒｎａｒｄ，
Ｊ．Ｌ．，Ｗａｔｅｒ−Ｓ．Ａ １０（３）Ｐ．１２
１，１９８４）などが提案されている。2. Description of the Related Art Conventionally, biological dephosphorization treatment of wastewater has been carried out by combining an anaerobic tank and an aerobic tank, and further by combining a denitrification tank to prevent inflow of nitric acid into the anaerobic tank. Method (UCT process) and a method of increasing the phosphorus removal efficiency by fermenting SS in wastewater with organic acid (Barnard,
J. L. , Water-S. A 10 (3) P. 12
1, 1984).
【０００３】具体的には、 廃水を嫌気槽、好気槽及び沈殿槽の順に通水すると
共に、沈殿槽で分離された汚泥の一部を嫌気槽に返送し
て、廃水中のＢＯＤ成分及びリン成分を生物学的に除去
する方法。或いは 廃水を嫌気槽、脱窒槽、好気槽及び沈殿槽の順に通
水すると共に、沈殿槽で分離された汚泥の一部を嫌気槽
に返送し、かつ好気槽処理液の一部を脱窒槽に返送し
て、廃水中のＢＯＤ成分、窒素成分及びリン成分を生物
学的に除去する方法。が採用されている。More specifically, wastewater is passed through an anaerobic tank, an aerobic tank, and a sedimentation tank in this order, and a part of the sludge separated in the sedimentation tank is returned to the anaerobic tank to remove the BOD component and the BOD component in the wastewater. A method for biologically removing phosphorus components. Alternatively, the wastewater is passed through an anaerobic tank, a denitrification tank, an aerobic tank, and a sedimentation tank in this order, a part of the sludge separated in the sedimentation tank is returned to the anaerobic tank, and a part of the aerobic tank treatment liquid is removed. A method of biologically removing BOD components, nitrogen components and phosphorus components in wastewater by returning the wastewater to a nitrification tank. Has been adopted.
【０００４】上記生物学的脱リン処理方法において、廃
水は、まず嫌気槽にて嫌気性処理され、ＢＯＤ成分が微
生物に取り込まれると共に、リン化合物が加水分解され
てリン（正リン酸）が放出される。[0004] In the above biological dephosphorization treatment method, wastewater is first anaerobically treated in an anaerobic tank, BOD components are taken up by microorganisms, and phosphorus compounds are hydrolyzed to release phosphorus (normal phosphoric acid). Is done.
【０００５】上記の方法においては、嫌気槽の処理液
は次いで脱窒槽で脱窒処理（硝酸イオン及び亜硝酸イオ
ンの窒素ガスへの還元処理）される。In the above method, the treatment liquid in the anaerobic tank is then subjected to a denitrification treatment (reduction treatment of nitrate ions and nitrite ions to nitrogen gas) in a denitrification tank.
【０００６】更に、の方法における嫌気槽処理液又は
の方法における脱窒槽処理液は、好気槽において嫌気
性処理され、微生物によるアンモニアの硝化と正リン酸
の取り込みが行なわれる。その後、好気槽処理液は沈殿
槽にて沈殿処理される。Further, the anaerobic tank treatment liquid in the above method or the denitrification tank treatment liquid in the above method is subjected to anaerobic treatment in an aerobic tank, and nitrification of ammonia and uptake of orthophosphoric acid by microorganisms are performed. Thereafter, the aerobic tank treatment liquid is subjected to a precipitation treatment in a precipitation tank.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記従
来の方法は、廃水として下水を処理するには有効であっ
ても、一般産業廃水、特に、フェノール類、ケトン類を
含む廃水には有効ではないという問題があった。However, the above-mentioned conventional method is effective for treating sewage as wastewater, but is not effective for general industrial wastewater, especially wastewater containing phenols and ketones. There was a problem.
【０００８】このため、このような産業廃水にも有効な
生物学的脱リン処理方法の開発が望まれている。Therefore, development of a biological dephosphorization method effective for such industrial wastewater is desired.
【０００９】本発明は上記従来の実情に鑑みてなされた
ものであり、廃水を嫌気槽、（脱窒槽）、好気槽及び沈
殿槽の順に通水することにより、廃水中のＢＯＤ成分、
（窒素成分）及びリン成分を生物学的に除去する方法に
おいて、脱リン効率の向上を図る廃水の処理方法を提供
することを目的とする。The present invention has been made in view of the above-mentioned conventional circumstances. By passing wastewater through an anaerobic tank, a (denitrification tank), an aerobic tank, and a sedimentation tank in this order, the BOD component in the wastewater can be reduced.
It is an object of the present invention to provide a method for treating wastewater that improves the efficiency of phosphorus removal in a method for biologically removing (nitrogen components) and phosphorus components.
【００１０】[0010]
【課題を解決するための手段】請求項１の廃水の処理方
法は、廃水を嫌気槽、好気槽及び沈殿槽の順に通水する
と共に、沈殿槽で分離された汚泥の一部を嫌気槽に返送
して、廃水中のＢＯＤ成分及びリン成分を生物学的に除
去する廃水の処理方法において、嫌気槽として第１嫌気
槽及び第２嫌気槽を含む２槽以上の嫌気槽を直列に設
け、沈殿槽で分離された汚泥の一部を、第１嫌気槽と第
２嫌気槽との両方に返送することを特徴とする。According to a first aspect of the present invention, there is provided a method of treating wastewater, wherein the wastewater is passed through an anaerobic tank, an aerobic tank, and a sedimentation tank in this order, and a part of the sludge separated in the sedimentation tank is subjected to an anaerobic tank. In the wastewater treatment method for biologically removing the BOD component and the phosphorus component in the wastewater, two or more anaerobic tanks including a first anaerobic tank and a second anaerobic tank are provided in series. And returning part of the sludge separated in the settling tank to both the first anaerobic tank and the second anaerobic tank.
【００１１】請求項２の廃水の処理方法は、廃水を嫌気
槽、脱窒槽、好気槽及び沈殿槽の順に通水すると共に、
沈殿槽で分離された汚泥の一部を嫌気槽に返送し、かつ
好気槽処理液の一部を脱窒槽に返送して、廃水中のＢＯ
Ｄ成分、窒素成分及びリン成分を生物学的に除去する廃
水の処理方法において、嫌気槽として第１嫌気槽及び第
２嫌気槽を含む２槽以上の嫌気槽を直列に設け、沈殿槽
で分離された汚泥の一部を、第１嫌気槽と第２嫌気槽と
の両方に返送することを特徴とする。According to a second aspect of the present invention, the wastewater is passed through an anaerobic tank, a denitrification tank, an aerobic tank, and a sedimentation tank in this order.
A part of the sludge separated in the sedimentation tank is returned to the anaerobic tank, and a part of the aerobic tank treatment liquid is returned to the denitrification tank.
In a method for treating wastewater for biologically removing D, nitrogen and phosphorus components, two or more anaerobic tanks including a first anaerobic tank and a second anaerobic tank are provided in series as anaerobic tanks, and separated in a sedimentation tank. A part of the sludge is returned to both the first anaerobic tank and the second anaerobic tank.
【００１２】[0012]
【作用】生物学的脱リン処理は、嫌気槽内で脱リン菌が
有機物を汚泥中に吸収し、ＰＨＢ（ポリヒドロキシブチ
レン）やグリコーゲン等の貯蔵有機物を合成することに
より引き起こされる。The biological dephosphorization treatment is caused by the dephosphorus bacteria absorbing organic substances into sludge in an anaerobic tank and synthesizing stored organic substances such as PHB (polyhydroxybutylene) and glycogen.
【００１３】即ち、嫌気槽において、菌体内のポリリン
酸を加水分解して得られるエネルギーを利用して、廃水
中の有機物を菌体内に摂取し、貯蔵有機物に転換し、そ
の際、液中に放出される正リン酸は、好気槽において有
機物の酸化によって得られるエネルギーを利用して菌体
外の正リン酸を摂取しポリリン酸を菌体内に蓄積する。That is, in an anaerobic tank, organic matter in wastewater is ingested into cells and converted into stored organic matter by utilizing energy obtained by hydrolyzing polyphosphoric acid in the cells. The released orthophosphoric acid takes in extraphosphorus orthophosphoric acid using energy obtained by oxidation of organic matter in the aerobic tank, and accumulates polyphosphoric acid in the microbial cells.
【００１４】しかしながら、廃水中に含有されるすべて
の有機物がこのような合成反応に有効ではなく、反応に
寄与しない有機物もある。因みに、メタノール、アセト
ン、フェノール等は有効ではない。However, all organic substances contained in the wastewater are not effective in such a synthesis reaction, and some organic substances do not contribute to the reaction. Incidentally, methanol, acetone, phenol and the like are not effective.
【００１５】一方、廃水中のＳＳを有機酸醗酵させて易
生物分解性ＣＯＤを増加させることにより、上記貯蔵有
機物の合成反応を助長することができ、結果として、脱
リン効率を高めることができる。On the other hand, by increasing the biodegradable COD by fermenting the SS in the wastewater with organic acid, the synthesis reaction of the stored organic matter can be promoted, and as a result, the dephosphorization efficiency can be increased. .
【００１６】しかしながら、この有機酸醗酵による方法
は、ＳＳを多く含む廃水には有効であるが、産業廃水、
特にＳＳをあまり含まない廃水、或いは、ＳＳがある程
度含まれていても、無機性ＳＳが多い産業廃水では、有
機酸醗酵が起こり難いことから、有効に作用しない。However, this method using organic acid fermentation is effective for wastewater containing a large amount of SS,
In particular, wastewater that does not contain much SS, or industrial wastewater that contains a lot of inorganic SS even if it contains some SS, does not work effectively because organic acid fermentation hardly occurs.
【００１７】通常の場合、有機酸醗酵は、廃水を嫌気性
条件下で攪拌するのみで、或いは、前掲のＷａｔｅｒ−
Ｓ．Ａに記載の方法で行なうことができるが、この場合
には臭気の発生が避けられない。しかも、有機酸醗酵が
起こり難い廃水では、有機酸醗酵のための処理時間を長
く要する。In the ordinary case, the organic acid fermentation is performed only by stirring the wastewater under anaerobic conditions, or by using the above-mentioned Water-fermentation.
S. A can be performed by the method described in A, but in this case, generation of odor is inevitable. Moreover, in wastewater in which organic acid fermentation is unlikely to occur, a long processing time for organic acid fermentation is required.
【００１８】また、従来法において、単に、嫌気槽の滞
留時間を長くすることにより、有機酸醗酵を起こし難い
廃水であっても有機酸醗酵を起こすことは可能である
が、この場合には汚泥が腐敗し、脱リンが起こらなくな
る。In the conventional method, it is possible to cause organic acid fermentation by simply increasing the residence time in an anaerobic tank even in wastewater in which organic acid fermentation is unlikely to occur. Will rot and dephosphorization will not occur.
【００１９】これに対して、本発明の方法に従って、嫌
気槽として、少なくとも２槽の嫌気槽を直列に設け、返
送汚泥の一部を第１嫌気槽へ、残部を第２嫌気槽へ返送
することにより、脱リン効率の向上が達成される理由の
詳細は明らかではないが、特に、第１嫌気槽において、
有機酸醗酵菌と脱リン菌とが有効に共生し、有機酸醗酵
による易生物分解生ＣＯＤの増加及びそれによる貯蔵有
機物の合成が促進されると共に、この貯蔵有機物を利用
した良好な脱リン反応が円滑に進行することによるもの
と推定される。On the other hand, according to the method of the present invention, at least two anaerobic tanks are provided in series as anaerobic tanks, and a part of the returned sludge is returned to the first anaerobic tank and the remaining part is returned to the second anaerobic tank. Thus, although the details of the reason why the improvement in dephosphorization efficiency is achieved are not clear, in particular, in the first anaerobic tank,
The organic acid fermentation bacteria and the dephosphorus bacteria effectively coexist, increasing the biodegradable raw COD by the organic acid fermentation and promoting the synthesis of the stored organic matter, and a favorable dephosphorization reaction utilizing the stored organic matter. Is presumed to be due to smooth progress.
【００２０】従って、本発明によれば、臭気発生を引き
起こすことなく、脱リン効率の大幅な向上が達成され、
また、この脱リン効率の向上に伴って、好気槽における
通気量の低減も図れる。Therefore, according to the present invention, a significant improvement in dephosphorization efficiency is achieved without causing odor generation,
Further, with the improvement of the dephosphorization efficiency, the amount of ventilation in the aerobic tank can be reduced.
【００２１】[0021]
【実施例】以下に図面を参照して本発明を詳細に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.
【００２２】図１は本発明の廃水の処理方法の一実施方
法を説明する系統図である。FIG. 1 is a system diagram for explaining one embodiment of the method for treating wastewater of the present invention.
【００２３】図中、１は第１嫌気槽、２は第２嫌気槽、
３は好気槽、４は沈殿槽、１Ａ，２Ａは攪拌機、３Ａは
曝気管である。また、図１（ｂ）において、５は脱窒槽
である。１１〜２１は配管を示す。In the figure, 1 is a first anaerobic tank, 2 is a second anaerobic tank,
3 is an aerobic tank, 4 is a sedimentation tank, 1A and 2A are stirrers, and 3A is an aeration tube. In FIG. 1B, reference numeral 5 denotes a denitrification tank. Reference numerals 11 to 21 denote pipes.
【００２４】図１（ａ）に示す方法においては、原水
（被処理廃水）は、配管１１により第１嫌気槽１に導入
された後、配管１２を経て第２嫌気槽２に導入されてそ
れぞれ嫌気性処理され、更に配管１３より好気槽３に導
入されて好気性処理される。好気性処理液は配管１４よ
り沈殿槽４に導入されて固液分離処理され、上澄水は配
管１５より処理水として系外に排出される。一方、沈殿
汚泥は配管１６より抜き出され、一部は配管１８より返
送汚泥として循環され、残部は余剰汚泥として配管１７
より系外へ排出される。In the method shown in FIG. 1A, raw water (waste water to be treated) is introduced into a first anaerobic tank 1 through a pipe 11 and then introduced into a second anaerobic tank 2 through a pipe 12. After being subjected to anaerobic treatment, it is further introduced into the aerobic tank 3 through the pipe 13 and subjected to aerobic treatment. The aerobic treatment liquid is introduced into the sedimentation tank 4 from the pipe 14 and subjected to solid-liquid separation processing, and the supernatant water is discharged from the pipe 15 as treated water to the outside of the system. On the other hand, the settled sludge is withdrawn from the pipe 16, a part of the sludge is circulated as return sludge from the pipe 18, and the rest is collected as excess sludge in the pipe 17.
It is discharged out of the system.
【００２５】本実施例においては、配管１８より返送さ
れる返送汚泥のうちの一部を配管２０を経て第１嫌気槽
１へ、残部を配管１９を経て第２嫌気槽２へ送給する。In this embodiment, a part of the returned sludge returned from the pipe 18 is supplied to the first anaerobic tank 1 via the pipe 20 and the remaining part is supplied to the second anaerobic tank 2 via the pipe 19.
【００２６】このように、嫌気槽として、２槽の第１、
２嫌気槽を直列に設置し、両嫌気槽に沈殿槽からの返送
汚泥を送給することにより、脱リン反応が効率的に行な
われるようになり、原水中のＢＯＤ成分及びリン成分が
高度に除去される。Thus, as the anaerobic tank, the first of the two tanks,
(2) By installing anaerobic tanks in series and sending back sludge from the sedimentation tank to both anaerobic tanks, the dephosphorization reaction can be performed efficiently, and the BOD component and phosphorus component in the raw water can be highly Removed.
【００２７】図１（ｂ）に示す方法は、好気槽３の前段
に脱窒槽５を設けると共に、好気槽３の処理水の一部を
配管２１より脱窒槽５に返送して脱窒処理を併せて行な
うようにしたこと以外は図１（ａ）に示す方法と同様に
実施される。In the method shown in FIG. 1B, a denitrification tank 5 is provided in front of the aerobic tank 3, and a part of the treated water in the aerobic tank 3 is returned to the denitrification tank 5 from the pipe 21 to denitrify the tank. The process is performed in the same manner as the method shown in FIG.
【００２８】本実施例の方法においても、嫌気槽とし
て、２槽の第１、２嫌気槽を直列に設置し、両嫌気槽に
沈殿槽からの返送汚泥を送給することにより、脱リン反
応が効率的に行なわれるようになり、廃水中のＢＯＤ成
分、窒素成分及びリン成分が高度に除去される。In the method of the present embodiment, the first and second anaerobic tanks are installed in series as anaerobic tanks, and the sludge returned from the sedimentation tank is supplied to both anaerobic tanks to remove the phosphorus. Is carried out efficiently, and the BOD component, nitrogen component and phosphorus component in the wastewater are highly removed.
【００２９】このような本発明の方法において、沈殿槽
４からの返送汚泥量は合計で原水流量に対して１０〜２
００％程度とするのが好ましい。しかして、第１嫌気槽
１には、この返送汚泥総量の５〜２０％を送給し、残部
を第２嫌気槽２に送給するようにするのが好ましい。こ
の第１嫌気槽１への返送汚泥量が多く、２０％を超える
と分割注入の効果が小さくなり、逆に５％未満の少量で
は長い滞留時間が必要となる。In the method of the present invention, the amount of sludge returned from the settling tank 4 is 10 to 2 in total with respect to the flow rate of the raw water.
It is preferably set to about 00%. Thus, it is preferable that the first anaerobic tank 1 is supplied with 5 to 20% of the total amount of returned sludge, and the remainder is supplied to the second anaerobic tank 2. The amount of sludge returned to the first anaerobic tank 1 is large, and if it exceeds 20%, the effect of divided injection becomes small, and if it is less than 5%, a long residence time is required.
【００３０】なお、図示の方法はいずれも本発明の一実
施例であって、本発明はその要旨を超えない限り、図示
の方法に限定されるものではない。The illustrated methods are all examples of the present invention, and the present invention is not limited to the illustrated methods unless it exceeds the gist.
【００３１】例えば、嫌気槽は２槽に限らず３槽以上設
け、これを直列に配設したものであっても良い。その場
合、第１嫌気槽に返送汚泥の一部を、第２嫌気槽に返送
汚泥の残部を送給すれば良いが、必要に応じて、第３嫌
気槽或いは第４嫌気槽以降の嫌気槽にも返送汚泥を送給
するようにしても良い。この場合においても、第１嫌気
槽への返送汚泥量は返送汚泥総量の５〜２０％であるこ
とが好ましい。For example, the number of anaerobic tanks is not limited to two but may be three or more, and these may be arranged in series. In that case, a part of the returned sludge may be sent to the first anaerobic tank and the rest of the returned sludge may be sent to the second anaerobic tank, but if necessary, the anaerobic tank after the third anaerobic tank or the fourth anaerobic tank. Alternatively, the returned sludge may be sent. Also in this case, it is preferable that the amount of sludge returned to the first anaerobic tank is 5 to 20% of the total amount of returned sludge.
【００３２】また、本発明の方法において、各槽の滞留
時間や原水の流量等には特に制限はなく、従来と同様の
条件とすることができる。ただし、嫌気槽を２槽設ける
場合、第１嫌気槽と第２嫌気槽との滞留時間は第１嫌気
槽の方を長くするのが好ましい。In the method of the present invention, the residence time of each tank, the flow rate of raw water, and the like are not particularly limited, and the same conditions as those in the related art can be used. However, when two anaerobic tanks are provided, it is preferable that the residence time between the first anaerobic tank and the second anaerobic tank be longer in the first anaerobic tank.
【００３３】このような本発明の廃水の処理方法は、産
業廃水、特に、ＳＳ含有量の少ない廃水、或いは、ＳＳ
中の無機性ＳＳの割合の多い廃水の処理に極めて有効で
ある。The method for treating wastewater according to the present invention can be applied to industrial wastewater, particularly wastewater having a low SS content, or SS wastewater.
It is extremely effective in treating wastewater containing a large proportion of inorganic SS therein.
【００３４】以下に具体的な実施例及び比較例を挙げて
本発明をより詳細に説明する。説明の便宜上、まず比較
例を挙げる。Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples. First, a comparative example will be given for convenience of explanation.
【００３５】比較例１ フェノール２００ｍｇ／ｌ，リン３ｍｇ／ｌ、アンモニ
ア４０ｍｇ／ｌを含む廃水を、嫌気槽、好気槽及び沈殿
槽の順に通水することにより処理した。なお、嫌気槽滞
留時間は１．０ｈｒ，好気槽滞留時間は４．０ｈｒ、沈
殿槽から嫌気槽への返送汚泥量は原水流量に対して５０
％とした。種汚泥としては、予めフェノールで馴養した
ものをＭＬＳＳ４０００ｍｇ／ｌとなるように添加し
た。Comparative Example 1 Waste water containing 200 mg / l of phenol, 3 mg / l of phosphorus, and 40 mg / l of ammonia was passed through an anaerobic tank, an aerobic tank, and a sedimentation tank in this order. The anaerobic tank residence time was 1.0 hr, the aerobic tank residence time was 4.0 hr, and the amount of sludge returned from the sedimentation tank to the anaerobic tank was 50 times the raw water flow rate.
%. Seed sludge that had been previously acclimated with phenol was added so as to have a MLSS of 4000 mg / l.
【００３６】その結果、運転開始３ケ月後においても、
処理水リン濃度は２．５〜３．０ｍｇ／ｌ，リン除去率
は平均１０％以下と、良好な結果は得られなかった。As a result, three months after the start of operation,
The treated water had a phosphorus concentration of 2.5 to 3.0 mg / l and a phosphorus removal rate of 10% or less on average, indicating that good results could not be obtained.
【００３７】比較例２ 比較例１において、嫌気槽の前段に攪拌槽（滞留時間
６．０ｈｒ）を設け、予め有機酸醗酵させた原水を嫌気
槽及び好気槽で処理したこと以外は同様にして行なった
（攪拌槽への汚泥返送は行なわない。）。Comparative Example 2 In Comparative Example 1, a stirring tank (residence time: 6.0 hr) was provided in front of the anaerobic tank, and raw water that had been subjected to organic acid fermentation was treated in an anaerobic tank and an aerobic tank in the same manner. (The sludge is not returned to the stirring tank.)
【００３８】その結果、運転開始１ケ月で処理水リン濃
度が０．５ｍｇ／ｌ以下となったが、その一週間後にリ
ン除去率が悪化し、以後３ケ月たってもリン除去率の回
復はみられなかった。As a result, the phosphorus concentration of the treated water became 0.5 mg / l or less one month after the start of operation, but one week later the phosphorus removal rate deteriorated, and the recovery of the phosphorus removal rate did not recover even after three months. I couldn't.
【００３９】実施例１ 比較例１と同様の廃水を図１（ａ）に示す方法で処理し
た。なお、第１嫌気槽への返送汚泥量は原水流量に対し
て５％とし、第２嫌気槽への返送汚泥量は原水流量に対
して５０％とし、また、第１嫌気槽滞留時間は６ｈｒ，
第２嫌気槽滞留時間は１ｈｒとした。その他の条件は、
比較例１と同様とした。Example 1 The same wastewater as in Comparative Example 1 was treated by the method shown in FIG. The amount of sludge returned to the first anaerobic tank was 5% with respect to the flow rate of raw water, the amount of sludge returned to the second anaerobic tank was 50% with respect to the flow rate of raw water, and the residence time of the first anaerobic tank was 6 hours. ,
The second anaerobic tank residence time was 1 hr. Other conditions are
The same as Comparative Example 1 was performed.
【００４０】その結果、運転開始１ケ月後には、処理水
リン濃度が０．５ｍｇ／ｌ以下となり、以後３ケ月間、
処理水リン濃度は１ｍｇ／ｌ以下で安定していた。As a result, one month after the start of operation, the phosphorus concentration of the treated water became 0.5 mg / l or less, and for three months thereafter,
The concentration of phosphorus in the treated water was stable at 1 mg / l or less.
【００４１】実施例２ 比較例１と同様の廃水を図１（ｂ）に示す方法で処理し
た。各槽の滞留時間及び返送汚泥量、好気槽処理水返送
量は下記の通りとした。また、種汚泥としてはフェノー
ルで馴養し、硝化活性のあるものをＭＬＳＳ６０００ｍ
ｇ／ｌとなるように用いた。Example 2 The same wastewater as in Comparative Example 1 was treated by the method shown in FIG. The residence time, returned sludge amount, and aerobic tank treated water return amount in each tank were as follows. Seed sludge acclimated with phenol and having nitrification activity is MLSS6000m.
g / l.
【００４２】第１嫌気槽滞留時間 ：６ｈｒ 第２嫌気槽滞留時間 ：１ｈｒ 脱窒槽滞留時間 ：３ｈｒ 好気槽滞留時間 ：６ｈｒ 第１嫌気槽返送汚泥量：原水流量の８％ 第２嫌気槽返送汚泥量：原水流量の１００％ 好気槽処理水返送量 ：原水流量の３００％ その結果、処理水中のリン濃度は０〜１．５ｍｇ／ｌで
あり、窒素濃度は３〜７ｍｇ／ｌであった。First anaerobic tank residence time: 6 hr Second anaerobic tank residence time: 1 hr Denitrification tank residence time: 3 hr Aerobic tank residence time: 6 hr First anaerobic tank return sludge amount: 8% of raw water flow rate Second anaerobic tank return Sludge amount: 100% of raw water flow rate Aerobic tank treated water return amount: 300% of raw water flow rate As a result, the phosphorus concentration in the treated water is 0 to 1.5 mg / l, and the nitrogen concentration is 3 to 7 mg / l. Was.
【００４３】比較例３ 実施例２において、嫌気槽を１槽のみ設け、嫌気槽滞留
時間７ｈｒ、返送汚泥量を原水流量の１００％としたこ
と以外は同様に処理を行なった。Comparative Example 3 The same treatment as in Example 2 was performed except that only one anaerobic tank was provided, the anaerobic tank residence time was 7 hours, and the amount of returned sludge was 100% of the raw water flow rate.
【００４４】その結果、処理中の窒素濃度は３〜７ｍｇ
／ｌであったが、リン濃度は２．５〜３ｍｇ／ｌであっ
た。As a result, the nitrogen concentration during the treatment was 3 to 7 mg.
/ L, but the phosphorus concentration was 2.5-3 mg / l.
【００４５】[0045]
【発明の効果】以上詳述した通り、本発明の廃水の処理
方法によれば、廃水を嫌気槽、好気槽及び沈殿槽の順に
通水して、廃水中のＢＯＤ成分及びリン成分を生物学的
に除去する方法、或いは、廃水を嫌気槽、脱窒槽、好気
槽及び沈殿槽の順に通水して、廃水中のＢＯＤ成分、窒
素成分及びリン成分を生物学的に除去する方法におい
て、産業廃水のように有機酸醗酵による脱リン効率の向
上に有効なＳＳを十分に含まない廃水であっても、有機
酸醗酵菌と脱リン菌との共生を好適なものとし、臭気発
生を引き起こすことなく脱リン効率の向上、更には好気
槽における通気量の低減を図ることができる。従って、
本発明の廃水の処理方法によれば、高効率かつ低コスト
な処理により、高水質処理水を得ることが可能とされ
る。As described in detail above, according to the method for treating wastewater of the present invention, wastewater is passed through an anaerobic tank, an aerobic tank and a sedimentation tank in this order, and the BOD component and the phosphorus component in the wastewater are converted into biological substances. Or a method of biologically removing wastewater by passing a wastewater through an anaerobic tank, a denitrification tank, an aerobic tank, and a sedimentation tank in this order to remove the BOD component, nitrogen component, and phosphorus component in the wastewater. However, even wastewater that does not sufficiently contain SS, which is effective for improving the dephosphorization efficiency by organic acid fermentation, such as industrial wastewater, makes the symbiosis of organic acid fermentation bacteria and dephosphorus bacteria suitable and reduces odor generation. It is possible to improve the dephosphorization efficiency and reduce the amount of ventilation in the aerobic tank without causing such a phenomenon. Therefore,
According to the wastewater treatment method of the present invention, high-quality treated water can be obtained by high-efficiency and low-cost treatment.
【図１】本発明の廃水の処理方法の一実施方法を説明す
る系統図である。FIG. 1 is a system diagram illustrating an embodiment of a method for treating wastewater of the present invention.
１ 第１嫌気槽 ２ 第２嫌気槽 ３ 好気槽 ４ 沈殿槽 ５ 脱窒槽 1 1st anaerobic tank 2 2nd anaerobic tank 3 aerobic tank 4 sedimentation tank 5 denitrification tank
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/30 C02F 3/34 101 Continuation of front page (58) Field surveyed (Int. Cl. 7 , DB name) C02F 3/30 C02F 3/34 101
Claims (2)
通水すると共に、沈殿槽で分離された汚泥の一部を嫌気
槽に返送して、廃水中のＢＯＤ成分及びリン成分を生物
学的に除去する廃水の処理方法において、 嫌気槽として第１嫌気槽及び第２嫌気槽を含む２槽以上
の嫌気槽を直列に設け、沈殿槽で分離された汚泥の一部
を、第１嫌気槽と第２嫌気槽との両方に返送することを
特徴とする廃水の処理方法。The wastewater is passed through an anaerobic tank, an aerobic tank and a sedimentation tank in this order, and a part of the sludge separated in the sedimentation tank is returned to the anaerobic tank to remove the BOD component and the phosphorus component in the wastewater. In the method for treating wastewater to be biologically removed, two or more anaerobic tanks including a first anaerobic tank and a second anaerobic tank are provided in series as an anaerobic tank, and a part of the sludge separated in the sedimentation tank is subjected to a second step. A method for treating wastewater, wherein the wastewater is returned to both the first anaerobic tank and the second anaerobic tank.
槽の順に通水すると共に、沈殿槽で分離された汚泥の一
部を嫌気槽に返送し、かつ好気槽処理液の一部を脱窒槽
に返送して、廃水中のＢＯＤ成分、窒素成分及びリン成
分を生物学的に除去する廃水の処理方法において、 嫌気槽として第１嫌気槽及び第２嫌気槽を含む２槽以上
の嫌気槽を直列に設け、沈殿槽で分離された汚泥の一部
を、第１嫌気槽と第２嫌気槽との両方に返送することを
特徴とする廃水の処理方法。2. The wastewater is passed through an anaerobic tank, a denitrification tank, an aerobic tank, and a sedimentation tank in this order, a part of the sludge separated in the sedimentation tank is returned to the anaerobic tank, and In a wastewater treatment method in which a part is returned to a denitrification tank and BOD components, nitrogen components and phosphorus components in the wastewater are biologically removed, two tanks including a first anaerobic tank and a second anaerobic tank as anaerobic tanks A method for treating wastewater, comprising providing the above anaerobic tank in series, and returning a part of the sludge separated in the sedimentation tank to both the first anaerobic tank and the second anaerobic tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20999292A JP3271315B2 (en) | 1992-08-06 | 1992-08-06 | Wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20999292A JP3271315B2 (en) | 1992-08-06 | 1992-08-06 | Wastewater treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0655192A JPH0655192A (en) | 1994-03-01 |
| JP3271315B2 true JP3271315B2 (en) | 2002-04-02 |
Family
ID=16582068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20999292A Expired - Lifetime JP3271315B2 (en) | 1992-08-06 | 1992-08-06 | Wastewater treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3271315B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9181602B2 (en) | 2009-08-28 | 2015-11-10 | Sms Group Gmbh | Device for degassing molten steel with an improved discharge nozzle |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4690265B2 (en) * | 2006-08-04 | 2011-06-01 | メタウォーター株式会社 | Wastewater treatment method |
| JP4854706B2 (en) * | 2008-06-09 | 2012-01-18 | 水ｉｎｇ株式会社 | Organic wastewater treatment method and treatment apparatus |
| JP5059077B2 (en) * | 2009-09-30 | 2012-10-24 | 住重環境エンジニアリング株式会社 | Wastewater treatment method |
-
1992
- 1992-08-06 JP JP20999292A patent/JP3271315B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9181602B2 (en) | 2009-08-28 | 2015-11-10 | Sms Group Gmbh | Device for degassing molten steel with an improved discharge nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0655192A (en) | 1994-03-01 |
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