JPH07256295A - Treatment of sewage return water - Google Patents
Treatment of sewage return waterInfo
- Publication number
- JPH07256295A JPH07256295A JP6049629A JP4962994A JPH07256295A JP H07256295 A JPH07256295 A JP H07256295A JP 6049629 A JP6049629 A JP 6049629A JP 4962994 A JP4962994 A JP 4962994A JP H07256295 A JPH07256295 A JP H07256295A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- sewage
- treatment
- return water
- tank
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
- Water Treatment By Sorption (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水処理場から発生す
る余剰汚泥、初沈汚泥、消化汚泥等の汚泥を濃縮処理す
る際に発生する上澄水や、脱水処理する際に発生する脱
水廃液等のいわゆる下水返流水の処理方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to supernatant water produced when concentrating sludge such as surplus sludge, first settled sludge and digested sludge produced from a sewage treatment plant, and dehydrated waste liquid produced during dehydration treatment. The present invention relates to a so-called sewage return water treatment method such as.
【０００２】[0002]
【従来の技術】従来の下水処理においては、下水処理場
から発生する余剰汚泥、初沈汚泥、消化汚泥等の汚泥を
濃縮処理する際に発生する上澄水や、脱水処理する際に
発生する脱水廃液等のいわゆる下水返流水は、図４に示
したように最初沈殿槽に返送して流入下水と混合され、
活性汚泥処理されてきた。このため、下水返流水中に含
有されるＳＳ、ＣＯＤ、ＢＯＤ、窒素、リン等の成分が
流入下水に加味されて負荷を増大させたり、次第に蓄積
され処理水質の低下を招くといった問題があった。ま
た、処理水量やＢＯＤ、窒素、リン等の成分の含有量の
増加による負荷量が増加した際に、都市部においては同
一処理場内に処理設備を増設することが困難であるとい
った問題が発生している。2. Description of the Related Art In conventional sewage treatment, supernatant water generated when concentrating sludge such as surplus sludge, primary sludge and digested sludge generated from a sewage treatment plant, and dehydration generated during dehydration treatment. So-called sewage return water such as waste liquid is first returned to the settling tank and mixed with the inflow sewage, as shown in FIG.
It has been treated with activated sludge. Therefore, there is a problem that components such as SS, COD, BOD, nitrogen, and phosphorus contained in the sewage return water are added to the inflow sewage to increase the load, or gradually accumulated to cause deterioration of treated water quality. . In addition, when the amount of treated water and the load due to the increase in the content of components such as BOD, nitrogen, and phosphorus increase, it is difficult to add treatment equipment in the same treatment plant in urban areas. ing.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、下水返流水に含有されるＢＯＤ、
窒素、リン等を除去して蓄積を防止し、負荷の増大や処
理水質の低下をなくするための方法を提供するものであ
る。また本発明は、処理水量やＢＯＤ、窒素、リン等の
成分の含有量の増加による負荷量が増加した際や、都市
部において同一処理場内に処理設備を増設することが困
難である際等に、複数の下水処理場の下水返流水を一括
して処理することを可能にする方法を提供するものであ
る。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and improves the BOD contained in sewage return water.
It is intended to provide a method for removing nitrogen, phosphorus, etc. to prevent accumulation and to prevent an increase in load and deterioration of treated water quality. Further, the present invention is applied when the load amount increases due to an increase in the amount of treated water or the content of components such as BOD, nitrogen and phosphorus, or when it is difficult to add treatment equipment in the same treatment plant in urban areas. It provides a method that makes it possible to collectively treat sewage return water from a plurality of sewage treatment plants.
【０００４】[0004]
【課題を解決するための手段】上記の課題を解決するた
めになされた請求項１に記載の発明は、下水処理場から
発生する余剰汚泥、初沈汚泥、消化汚泥等の汚泥に対し
て脱水、濃縮等の処理をすることにより発生する下水返
流水に、凝集剤を添加して凝集沈殿処理することを特徴
とするものである。また請求項２に記載の発明は、下水
処理場から発生する余剰汚泥、初沈汚泥、消化汚泥等の
汚泥に対して脱水、濃縮等の処理をすることにより発生
する下水返流水と、後段の凝集沈殿処理で発生する凝集
沈殿後の余剰汚泥を曝気することにより活性化した活性
化返送汚泥とを接触させて、下水返流水中のＢＯＤや窒
素を吸着させた後、凝集剤を添加して凝集沈殿処理する
ことを特徴とするものである。また請求項３に記載の発
明は、複数の下水処理場から発生する余剰汚泥、初沈汚
泥、消化汚泥等の汚泥をパイプライン等の移送手段によ
り１か所の処理場に移送し、集められた汚泥を脱水、濃
縮等の処理をすることにより発生する下水返流水を、そ
の処理場の後段の凝集沈殿処理で発生する凝集沈殿後の
余剰汚泥を曝気することにより活性化した活性化返送汚
泥と接触させて、下水返流水中のＢＯＤや窒素を吸着さ
せた後、凝集剤を添加して凝集沈殿処理することを特徴
とするものである。また請求項４に記載の発明は、複数
の下水処理場から発生する余剰汚泥、初沈汚泥、消化汚
泥等の汚泥に対して脱水、濃縮等の処理をすることによ
り発生する下水返流水を、パイプライン等の移送手段に
より１か所の処理場に移送し、集められた下水返流水を
その処理場の後段の凝集沈殿処理で発生する凝集沈殿後
の余剰汚泥を曝気することにより活性化した活性化返送
汚泥と接触させて、下水返流水中のＢＯＤや窒素を吸着
させた後、凝集剤を添加して凝集沈殿処理することを特
徴とするものである。更に請求項５に記載の発明は、上
記のいずれかの方法で処理された処理水を更に脱窒、硝
化処理することを特徴とするものである。The invention according to claim 1 made in order to solve the above-mentioned problems, dehydrates sludge such as surplus sludge, first settling sludge and digested sludge generated from a sewage treatment plant. It is characterized in that a coagulant is added to the sewage return water generated by the treatment such as concentration, and the coagulation sedimentation treatment is performed. Further, the invention according to claim 2 is the sewage return water generated by subjecting sludge such as surplus sludge, first settling sludge and digested sludge generated from the sewage treatment plant to dehydration and concentration, and After contacting the activated return sludge activated by aeration of the excess sludge after coagulation sedimentation generated in the coagulation sedimentation treatment, after adsorbing BOD and nitrogen in the sewage return water, a coagulant is added. It is characterized by a coagulating sedimentation treatment. In the invention according to claim 3, sludges generated from a plurality of sewage treatment plants, such as surplus sludge, first settled sludge and digested sludge, are transferred to one treatment plant by a transfer means such as a pipeline and collected. Activated return sludge activated by aeration of sewage return water generated by subjecting sludge to dehydration and concentration, etc., by aeration of excess sludge after coagulation sedimentation generated in coagulation sedimentation treatment at the latter stage of the treatment plant. And then adsorb BOD and nitrogen in the sewage return water, and then add a coagulant to carry out coagulation-precipitation treatment. Further, the invention according to claim 4 is the sewage return water generated by subjecting sludge such as surplus sludge, primary sludge and digested sludge generated from a plurality of sewage treatment plants to dehydration and concentration, The sewage return water was transferred to one treatment site by a transfer means such as a pipeline and activated by aeration of excess sludge after coagulation sedimentation generated in the coagulation sedimentation treatment in the latter stage of the treatment site. It is characterized in that it is brought into contact with the activated return sludge to adsorb BOD and nitrogen in the sewage return water, and then a coagulant is added to perform coagulation sedimentation treatment. Further, the invention according to claim 5 is characterized in that the treated water treated by any one of the above methods is further subjected to denitrification and nitrification treatment.
【０００５】[0005]
【実施例】以下に各発明を図示の実施例によって更に詳
細に説明し、併せて各発明の作用を説明する。請求項１
の発明においては、図１に示すように流入下水を最初沈
殿槽１１で沈殿させた後、上澄水を曝気槽１２で曝気
し、最終沈殿槽１３で再度重力沈殿して分離された余剰
汚泥を最初沈殿槽１１で分離された初沈汚泥とともに脱
水機１で脱水し、得られた脱水ろ液を下水返流水とす
る。この下水返流水に凝集槽３で凝集剤を添加して凝集
させ、凝集沈殿槽４で分離して凝集沈殿処理水を得る。The present invention will be described in more detail below with reference to the embodiments shown in the drawings, and the operation of each invention will be described. Claim 1
In the invention of FIG. 1, the inflowing sewage is first precipitated in the settling tank 11, the supernatant water is aerated in the aeration tank 12, and the surplus sludge separated by gravity settling again in the final settling tank 13 is separated as shown in FIG. The dehydrated filtrate is dehydrated by the dehydrator 1 together with the initially settled sludge first separated in the settling tank 11, and is used as sewage return water. A coagulant is added to the sewage return water in the coagulation tank 3 to cause coagulation and separation in the coagulation sedimentation tank 4 to obtain coagulation sedimentation treated water.
【０００６】この下水返流水中には、例えば表１に示す
ようにＳＳ、ＣＯＤ、ＢＯＤ、窒素、リン等の成分が含
有されており、ＳＳに対して例えば２００〜５００ｐｐ
ｍの凝集剤（ＰＡＣ、硫酸バンド等の無機凝集剤）を添
加すれば、凝集沈殿により２〜３ｍｍ程度の凝集フロッ
クを形成することができ、この凝集沈殿により下水返流
水中のＳＳは８０％程度除去できる。なおリンの除去率
を向上させるためには凝集剤の添加量を増加させるが、
ＡｌとＰの比（Ａｌ／Ｐ）を１〜２、好ましくは１．１
〜１．５とすると、表１に示すようにＳＳ、ＣＯＤ、リ
ン等が８０％程度除去される。The sewage return water contains components such as SS, COD, BOD, nitrogen and phosphorus as shown in Table 1, for example, 200 to 500 pp relative to SS.
By adding m coagulant (inorganic coagulant such as PAC or sulfuric acid band), flocculation flocs of about 2 to 3 mm can be formed by coagulation sedimentation, and SS in sewage return water is 80% by this coagulation sedimentation. It can be removed to some extent. In order to improve the phosphorus removal rate, the addition amount of the coagulant is increased,
The ratio of Al to P (Al / P) is 1 to 2, preferably 1.1.
When it is set to 1.5, SS, COD, phosphorus, etc. are removed by about 80% as shown in Table 1.
【０００７】しかし、下水返流水中に含有されるＳＳ、
ＣＯＤ、ＢＯＤ、窒素、リン等を凝集沈殿のみにより高
度に除去することは、凝集剤の添加量が少ない場合には
困難であり、また凝集剤の添加量を増加させれば可能と
なるもののコスト高となる。そこで請求項２の発明で
は、図２のように脱水機１から得た下水返流水を活性化
返送汚泥とともに接触安定槽２に導き、下水返流水中の
ＢＯＤや窒素を活性化返送汚泥に吸着させる。この活性
化返送汚泥は活性化槽５において曝気され活性化された
ものであり、その返送汚泥率は請求項３に示したように
下水返流水の流量の１０〜５０％、好ましくは２０〜３
０％とする。また接触安定槽２における滞留時間は２０
〜９０分、より好ましくは３０〜６０分とする。実施例
では接触安定槽２と活性化槽５との容積比は１：１とさ
れており、返送率２０〜３０％に固定することにより活
性化槽５の滞留時間は接触安定槽２の３．３３〜５倍と
なる。However, SS contained in the sewage return water,
Highly removing COD, BOD, nitrogen, phosphorus, etc. only by coagulation and precipitation is difficult when the amount of coagulant added is small, and the cost can be increased by increasing the amount of coagulant added. It becomes high. Therefore, in the invention of claim 2, as shown in FIG. 2, the sewage return water obtained from the dehydrator 1 is guided to the contact stabilization tank 2 together with the activated return sludge, and BOD and nitrogen in the sewage return water are adsorbed to the activated return sludge. Let The activated return sludge is aerated and activated in the activation tank 5, and the return sludge rate is 10 to 50%, preferably 20 to 3 of the flow rate of the sewage return water as shown in claim 3.
0% Further, the residence time in the contact stabilizing tank 2 is 20
To 90 minutes, more preferably 30 to 60 minutes. In the embodiment, the volume ratio between the contact stabilization tank 2 and the activation tank 5 is set to 1: 1. By fixing the return rate to 20 to 30%, the residence time of the activation tank 5 is 3 times that of the contact stabilization tank 2. .33 to 5 times.
【０００８】このようにして接触安定槽２においてＢＯ
Ｄや窒素を活性化返送汚泥に吸着させた接触安定処理水
を凝集槽３に導き、凝集剤を添加して攪拌する。凝集槽
３を出た接触安定処理水は凝集沈殿槽４において固液分
離され、分離された汚泥の一部は凝集沈殿後の返送汚泥
として活性化槽５に送られ、残部は系外へ排出される。
次の表１に、請求項１、２の発明における含有成分の除
去性能を示し、表２に従来の硝化液循環法における脱窒
槽と硝化槽の容積を１とした場合の、請求項１、２の発
明における脱窒槽と硝化槽の容積比を示す。In this way, the BO in the contact stabilizing tank 2
The contact stabilization treated water in which D and nitrogen are adsorbed by the activated return sludge is introduced into the coagulation tank 3, a coagulant is added, and the mixture is stirred. The contact stabilization treated water that has left the coagulation tank 3 is subjected to solid-liquid separation in the coagulation sedimentation tank 4, a part of the separated sludge is sent to the activation tank 5 as return sludge after coagulation sedimentation, and the rest is discharged to the outside of the system. To be done.
The following Table 1 shows the removal performance of the contained components in the inventions of claims 1 and 2, and Table 2 shows the removal performance of the components contained in the denitrification tank and the nitrification tank in the conventional nitrification solution circulation method, The volume ratio of the denitrification tank and the nitrification tank in the invention of 2 is shown.
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【表２】 [Table 2]
【００１１】請求項３の発明は、図２に示すように複数
の下水処理場から発生する汚泥を、パイプライン等の移
送手段により１か所の処理場に移送し、集められた汚泥
を、脱水、濃縮等の処理をすることにより発生する下水
返流水を請求項２の発明の方法によって活性化返送汚泥
と接触させ、凝集沈殿処理する方法である。この請求項
３の発明によれば、複数の下水処理場の下水返流水を一
括して処理することができるので、都市部において同一
処理場内に処理設備を増設することが困難である際等に
適する。また請求項４の発明は、複数の下水処理場にお
いて発生した下水返流水を１か所の処理場に集め、請求
項３と同様に処理する方法である。According to the third aspect of the invention, as shown in FIG. 2, sludge generated from a plurality of sewage treatment plants is transferred to one treatment plant by a transfer means such as a pipeline, and the collected sludge is According to the method of the present invention, the sewage return water generated by the treatments such as dehydration and concentration is brought into contact with the activated return sludge to carry out a coagulation sedimentation treatment. According to the invention of claim 3, since the sewage return water of a plurality of sewage treatment plants can be collectively treated, when it is difficult to add treatment equipment in the same treatment plant in urban areas, etc. Suitable. Further, the invention of claim 4 is a method of collecting sewage return water generated in a plurality of sewage treatment plants in one treatment plant and treating it in the same manner as in claim 3.
【００１２】請求項５の発明は、請求項１の発明により
得られた凝集沈殿処理水や、請求項２〜４の発明により
得られた接触安定処理水等を更に脱窒槽６、硝化槽７に
導いて硝化液循環法により処理する方法である。硝化液
は硝化液沈殿槽８により固液分離され排出される。この
方法によれば、より完全な処理が可能となる。According to a fifth aspect of the present invention, the coagulation sedimentation treated water obtained by the first aspect of the invention, the contact stabilization treated water obtained by the second aspect of the invention, and the like are further denitrified by a denitrification tank 6 and a nitrification tank 7. It is a method of conducting the treatment by the nitrification solution circulation method. The nitrification solution is solid-liquid separated by the nitrification solution settling tank 8 and discharged. This method enables more complete processing.
【００１３】[0013]
【発明の効果】本発明の下水返流水の処理方法によれ
ば、表１に示したように凝集沈殿処理により下水返流水
中のＢＯＤや窒素を従来法によるよりもよく除去するこ
とができる。また接触安定化処理を付加することによ
り、下水返流水中のＢＯＤや窒素を更によく除去するこ
とができる。また、接触安定処理水の水質が安定するの
で、流入する下水返流水の濃度変動に対しても安定した
処理性能を維持することができる。According to the method for treating sewage return water of the present invention, as shown in Table 1, BOD and nitrogen in the sewage return water can be removed better by the coagulation sedimentation treatment than by the conventional method. Further, by adding the contact stabilization treatment, BOD and nitrogen in the sewage return water can be removed more effectively. Further, since the quality of the contact-stabilized treated water is stable, stable treatment performance can be maintained even when the concentration of the inflowing sewage return water changes.
【図１】請求項１の発明の実施例のフローシートであ
る。FIG. 1 is a flow sheet of an embodiment of the invention of claim 1.
【図２】請求項２、３の発明の実施例のフローシートで
ある。FIG. 2 is a flow sheet of an embodiment of the invention of claims 2 and 3.
【図３】請求項５の発明の実施例のフローシートであ
る。FIG. 3 is a flow sheet of an embodiment of the invention of claim 5;
【図４】従来法のフローシートである。FIG. 4 is a flow sheet of a conventional method.
１ 脱水機、２ 接触安定槽、３ 凝集槽、４ 凝集沈
殿槽、５ 活性化槽1 dehydrator, 2 contact stabilization tank, 3 coagulation tank, 4 coagulation sedimentation tank, 5 activation tank
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 1/28 ＺＡＢ Ａ 1/52 ＺＡＢ Ｅ 3/12 ＺＡＢ Ｎ 11/12 ＺＡＢ Ｃ 11/14 ＺＡＢ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location C02F 1/28 ZAB A 1/52 ZAB E 3/12 ZAB N 11/12 ZAB C 11/14 ZAB A
Claims (5)
汚泥、消化汚泥等の汚泥に対して脱水、濃縮等の処理を
することにより発生する下水返流水に、凝集剤を添加し
て凝集沈殿処理することを特徴とする下水返流水の処理
方法。1. A flocculant is added to the sewage return water generated by subjecting sludge such as surplus sludge, first settling sludge, digested sludge, etc. generated from a sewage treatment plant to dehydration and concentration, and coagulated. A method for treating sewage return water, characterized by performing a precipitation treatment.
汚泥、消化汚泥等の汚泥に対して脱水、濃縮等の処理を
することにより発生する下水返流水と、後段の凝集沈殿
処理で発生する凝集沈殿後の余剰汚泥を曝気することに
より活性化した活性化返送汚泥とを接触させて、下水返
流水中のＢＯＤや窒素を吸着させた後、凝集剤を添加し
て凝集沈殿処理することを特徴とする下水返流水の処理
方法。2. The sewage return water generated by subjecting sludge such as surplus sludge, first settled sludge, digested sludge, etc. generated from a sewage treatment plant to dehydration and concentration, and the coagulation-sedimentation treatment in the latter stage. After contacting the activated return sludge activated by aeration of excess sludge after coagulation and sedimentation to adsorb BOD and nitrogen in the sewage return water, a coagulant is added to perform coagulation and sedimentation treatment. A method for treating sewage return water, characterized by.
泥、初沈汚泥、消化汚泥等の汚泥をパイプライン等の移
送手段により１か所の処理場に移送し、集められた汚泥
を脱水、濃縮等の処理をすることにより発生する下水返
流水を、その処理場の後段の凝集沈殿処理で発生する凝
集沈殿後の余剰汚泥を曝気することにより活性化した活
性化返送汚泥と接触させて、下水返流水中のＢＯＤや窒
素を吸着させた後、凝集剤を添加して凝集沈殿処理する
ことを特徴とする下水返流水の処理方法。3. Sludge such as surplus sludge, first settled sludge, digested sludge, etc. generated from a plurality of sewage treatment plants is transferred to one treatment plant by a transfer means such as a pipeline, and the collected sludge is dehydrated, Sewage return water generated by processing such as concentration, contact with activated return sludge activated by aeration of excess sludge after coagulation sedimentation generated in the coagulation sedimentation treatment of the latter stage of the treatment site, A method for treating sewage return water, which comprises adsorbing BOD or nitrogen in the sewage return water, and then adding a coagulant to perform coagulation sedimentation treatment.
泥、初沈汚泥、消化汚泥等の汚泥に対して脱水、濃縮等
の処理をすることにより発生する下水返流水を、パイプ
ライン等の移送手段により１か所の処理場に移送し、集
められた下水返流水をその処理場の後段の凝集沈殿処理
で発生する凝集沈殿後の余剰汚泥を曝気することにより
活性化した活性化返送汚泥と接触させて、下水返流水中
のＢＯＤや窒素を吸着させた後、凝集剤を添加して凝集
沈殿処理することを特徴とする下水返流水の処理方法。4. The sewage return water generated by dewatering and concentrating sludge such as surplus sludge, first settling sludge, digested sludge, etc. generated from a plurality of sewage treatment plants is transferred to a pipeline or the like. The activated sewage return sludge activated by aeration of excess sewage after coagulation sedimentation generated by coagulation sedimentation treatment after the sewage return water collected at one treatment site by means of means. A method for treating sewage return water, which comprises contacting and adsorbing BOD or nitrogen in the sewage return water, and then adding a coagulant to perform coagulation sedimentation treatment.
れた処理水を更に脱窒、硝化処理することを特徴とする
下水返流水の処理方法。5. A method for treating sewage return water, which comprises denitrifying and nitrifying the treated water treated by any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6049629A JP2704109B2 (en) | 1994-03-22 | 1994-03-22 | Sewage return water treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6049629A JP2704109B2 (en) | 1994-03-22 | 1994-03-22 | Sewage return water treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07256295A true JPH07256295A (en) | 1995-10-09 |
| JP2704109B2 JP2704109B2 (en) | 1998-01-26 |
Family
ID=12836522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6049629A Expired - Lifetime JP2704109B2 (en) | 1994-03-22 | 1994-03-22 | Sewage return water treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704109B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100319375B1 (en) * | 1999-07-30 | 2002-01-09 | 채문식 | Method and Apparatus of Nitrogen Removal from the Recycle Water in the Sewage Treatment Plant |
| JP2006081963A (en) * | 2004-09-14 | 2006-03-30 | Hitachi Kiden Kogyo Ltd | Method and apparatus for treating sludge-containing returned water |
| CN102557386A (en) * | 2010-12-09 | 2012-07-11 | 中铝国际技术发展有限公司 | Sludge disposal method for circulating water of coal gas station of alumina plant |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0418994A (en) * | 1990-05-15 | 1992-01-23 | Kurita Water Ind Ltd | Treatment of organic waste water |
| JPH04313399A (en) * | 1991-04-12 | 1992-11-05 | Mitsubishi Heavy Ind Ltd | Method for cleaning filter cloth of dehydrator |
-
1994
- 1994-03-22 JP JP6049629A patent/JP2704109B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0418994A (en) * | 1990-05-15 | 1992-01-23 | Kurita Water Ind Ltd | Treatment of organic waste water |
| JPH04313399A (en) * | 1991-04-12 | 1992-11-05 | Mitsubishi Heavy Ind Ltd | Method for cleaning filter cloth of dehydrator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100319375B1 (en) * | 1999-07-30 | 2002-01-09 | 채문식 | Method and Apparatus of Nitrogen Removal from the Recycle Water in the Sewage Treatment Plant |
| JP2006081963A (en) * | 2004-09-14 | 2006-03-30 | Hitachi Kiden Kogyo Ltd | Method and apparatus for treating sludge-containing returned water |
| JP4610977B2 (en) * | 2004-09-14 | 2011-01-12 | 株式会社日立プラントテクノロジー | Method and apparatus for treating sludge return water |
| CN102557386A (en) * | 2010-12-09 | 2012-07-11 | 中铝国际技术发展有限公司 | Sludge disposal method for circulating water of coal gas station of alumina plant |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2704109B2 (en) | 1998-01-26 |
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