JPS63294990A - Waste water treatment device - Google Patents
Waste water treatment deviceInfo
- Publication number
- JPS63294990A JPS63294990A JP12914587A JP12914587A JPS63294990A JP S63294990 A JPS63294990 A JP S63294990A JP 12914587 A JP12914587 A JP 12914587A JP 12914587 A JP12914587 A JP 12914587A JP S63294990 A JPS63294990 A JP S63294990A
- Authority
- JP
- Japan
- Prior art keywords
- yeast
- tank
- wastewater
- rotifera
- treated water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004065 wastewater treatment Methods 0.000 title claims description 14
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims abstract description 47
- 241000700141 Rotifera Species 0.000 claims abstract description 30
- 239000002351 wastewater Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 14
- 244000005700 microbiome Species 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 6
- 239000005416 organic matter Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000010802 sludge Substances 0.000 abstract description 25
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 239000008188 pellet Substances 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 230000000644 propagated effect Effects 0.000 abstract 2
- 235000014680 Saccharomyces cerevisiae Nutrition 0.000 description 36
- 235000013305 food Nutrition 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 235000010410 calcium alginate Nutrition 0.000 description 2
- 239000000648 calcium alginate Substances 0.000 description 2
- 229960002681 calcium alginate Drugs 0.000 description 2
- OKHHGHGGPDJQHR-YMOPUZKJSA-L calcium;(2s,3s,4s,5s,6r)-6-[(2r,3s,4r,5s,6r)-2-carboxy-6-[(2r,3s,4r,5s,6r)-2-carboxylato-4,5,6-trihydroxyoxan-3-yl]oxy-4,5-dihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate Chemical compound [Ca+2].O[C@@H]1[C@H](O)[C@H](O)O[C@@H](C([O-])=O)[C@H]1O[C@H]1[C@@H](O)[C@@H](O)[C@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@H](O2)C([O-])=O)O)[C@H](C(O)=O)O1 OKHHGHGGPDJQHR-YMOPUZKJSA-L 0.000 description 2
- 235000010418 carrageenan Nutrition 0.000 description 2
- 239000000679 carrageenan Substances 0.000 description 2
- 229920001525 carrageenan Polymers 0.000 description 2
- 229940113118 carrageenan Drugs 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003100 immobilizing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 2
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000834 fixative Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229940081969 saccharomyces cerevisiae Drugs 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は廃水処理装置に係り、特に廃水中の有機物を微
生物により生物学的に分解する廃水処理装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wastewater treatment device, and particularly to a wastewater treatment device that biologically decomposes organic matter in wastewater using microorganisms.
従来、有機性廃水の生物学的処理方法として活性汚泥法
が多く採用されている。この方法は廃水に含まれている
各種の有機物を培養基として溶存酵素の存在下で微生物
の混合集団を連続培養し、汚染性有機物を凝集、吸着、
酸化分解、沈澱の各作用で除去する方法である。この方
法では、維持管理が用意であり、流入廃水の水質の変動
や濃度の変動に対して強く、また、温度による影響を受
けることが少なく、特に低温に耐える等の長所があり、
従来から産業廃水、下水等の処理に多く採用されている
。この主の生物学的廃水処理方法では、種々の微生物か
らなる活性汚泥を廃水と接触させている。この処理プロ
セスは、浄化機能をもったフロック状の生物増殖体を必
要に応じて生物反応系内で絶えず循環させ、曝気槽内で
廃水中のＢＯＤ成分と浄化微生物の比率が常に一定とな
るように人為的に操作し、溶存酵素の下で廃水と異種固
体群の微生物によって構成されるフロックと ゛
を充分に接触させて、これを好気的に酸化・分解させる
。Conventionally, the activated sludge method has been widely adopted as a biological treatment method for organic wastewater. In this method, a mixed population of microorganisms is continuously cultured in the presence of dissolved enzymes using various organic substances contained in wastewater as a culture medium, and contaminant organic substances are coagulated, adsorbed, and
This method uses oxidative decomposition and precipitation to remove it. This method has the advantages of easy maintenance, resistance to fluctuations in water quality and concentration of inflow wastewater, and less influence by temperature, especially resistant to low temperatures.
It has been widely used for treating industrial wastewater, sewage, etc. In this main biological wastewater treatment method, activated sludge consisting of various microorganisms is brought into contact with wastewater. This treatment process constantly circulates floc-like biological growth bodies with a purifying function within the biological reaction system as needed, and ensures that the ratio of BOD components and purifying microorganisms in the wastewater remains constant at all times in the aeration tank. This is artificially manipulated to bring the wastewater into sufficient contact with flocs composed of a heterogeneous group of microorganisms in the presence of dissolved enzymes, and aerobically oxidize and decompose the flocs.
〔発明が解決しようとする問題点］
ところが、上記従来方法では、生成する余剰汚泥が多く
、余剰汚泥の処理、処分が困難であるという問題があっ
た。すなわち、活性汚泥処理プロセスでは、廃水中のＢ
ＯＤが分解されて菌体に取付は込まれるので、余剰汚泥
が発生する。この生物学的処理で発生した余剰汚泥は、
化学的処理から発生した汚泥より一般的に濃縮、脱水等
の処理がしに＜＜、特に粘性、圧縮性が高く、腐敗性が
あるので問題となっている。[Problems to be Solved by the Invention] However, the conventional method described above has a problem in that a large amount of surplus sludge is generated and it is difficult to process and dispose of the surplus sludge. In other words, in the activated sludge treatment process, B in wastewater
As OD is decomposed and attached to bacterial cells, surplus sludge is generated. The surplus sludge generated from this biological treatment is
Sludge generated from chemical treatment is generally more difficult to process through thickening, dewatering, etc., and is particularly problematic because it has high viscosity, compressibility, and putrefaction.
本発明は、上記従来の問題点に着目し、余剰汚泥の発生
量が更に少ない廃水処理装置を提供することを目的とす
る。The present invention focuses on the above conventional problems and aims to provide a wastewater treatment device that generates even less surplus sludge.
一般に余剰汚泥を低減する方法として、余剰汚泥を輪生
に摂食させる方法が容易に考えつく。しかし、余剰汚泥
は輪生にとって摂食し難い餌である。余剰汚泥が酵母菌
であれば摂食し易いのであるが、廃水処理のような開放
培養系で酵母を優先して培養することは不可能である。Generally, as a method of reducing excess sludge, it is easy to think of a method of feeding excess sludge to whorls. However, excess sludge is food that is difficult for whorls to consume. If the surplus sludge is yeast, it is easy to ingest it, but it is impossible to preferentially cultivate yeast in an open culture system such as in wastewater treatment.
そこで、本発明に係る廃水処理装置は、上記目的を達成
するべく、廃水中の有機物を微生物により生物学的に分
解する廃水処理装置において、固定化酵母が充填され廃
水が導入される固定化酵母槽と、この固定化酵母槽から
浮遊酵母を含有する処理水が導入されるとともに輪虫類
を充填している輪虫培養槽と、この輪虫培養槽に併設さ
れて輪虫類と処理水を分解する分解手段とを備えた構成
とした。この場合前記酵母の固定化には、例えばポリア
クリルアミド、アルギン酸カルシウム、カラギーナン等
、従来公知の任意の担体を使用すればよい。Therefore, in order to achieve the above object, the wastewater treatment device according to the present invention is a wastewater treatment device that biologically decomposes organic matter in wastewater using microorganisms. A rotifer culture tank into which treated water containing floating yeast is introduced from the immobilized yeast tank and filled with rotifers; The structure includes a disassembly means for disassembling the. In this case, any conventionally known carrier such as polyacrylamide, calcium alginate, carrageenan, etc. may be used to immobilize the yeast.
上記構成によれば、固定化酵母菌が充填された固定化酵
母槽に廃水を導入することによって、廃水が酵母菌によ
り分解処理され、固定化酵母ベレット内部で増殖した酵
母は外に漏れ、外液では酵母が優先して増殖することに
なる。この浮遊酵母含有の処理水を次段の輪虫培養槽に
供給することによって、当該槽内で輪虫類が浮遊酵母を
餌として摂食する。これにより増殖した輪虫類と処理水
は分解手段により分別し、処理水のみ系外に取り出す。According to the above configuration, by introducing wastewater into the immobilized yeast tank filled with immobilized yeast bacteria, the wastewater is decomposed by the yeast bacteria, and the yeast that has grown inside the immobilized yeast pellet leaks to the outside. In liquid, yeast will multiply preferentially. By supplying this treated water containing floating yeast to the rotifer culture tank in the next stage, the rotifers feed on the floating yeast in the tank. The rotifers that have multiplied as a result and the treated water are separated by a decomposition means, and only the treated water is taken out of the system.
したがって、余剰汚泥として輪虫類が生産されるが、Ｂ
ＯＤ変換率では極めて低くなって余剰汚泥を低減させる
ことができるのである。Therefore, rotifers are produced as surplus sludge, but B
The OD conversion rate is extremely low, making it possible to reduce excess sludge.
以下に、本発明に係る廃水処理装置の実施例を図面を参
照して詳細に説明する。Embodiments of the wastewater treatment apparatus according to the present invention will be described in detail below with reference to the drawings.
図面は実施例に係る廃水処理装置の構成図である。図に
示すように、この装置は初段槽として固定化酵母槽１０
を具備している。この固定化酵母槽１０には廃水導入管
１２が臨んでおり、廃水が直接供給されるようになって
いる。固定化酵母１０は内部に固定化酵母ベレットを５
〜４０％充填するようにしている。酵母菌の固定化には
従来公知のポリアクリルアミド、アルギン酸カルシウム
、カラギーナン等、任意の担体を使用すればよい。そし
て、固定化酵母ペレットは酵母菌を重合性の固定化剤中
に懸濁した後、酵母菌を含む固定化剤と重合性触媒とを
混合し、この混合液を液適状にして疎水性液中に適下に
造粒したり、あるいは予め固定化剤中にアルギン酸塩を
助剤として添加しておき、多価金属イオンの水溶液中に
液下し、不溶性皮膜をもつ球形の液適の状態において重
合させることで造られる。The drawing is a configuration diagram of a wastewater treatment device according to an embodiment. As shown in the figure, this device has an immobilized yeast tank 10 as the first stage tank.
Equipped with: A wastewater introduction pipe 12 faces the immobilized yeast tank 10, so that wastewater is directly supplied thereto. Immobilized yeast 10 contains 5 immobilized yeast pellets inside.
I try to fill it up to ~40%. For immobilization of yeast, any conventionally known carrier such as polyacrylamide, calcium alginate, carrageenan, etc. may be used. Immobilized yeast pellets are produced by suspending yeast in a polymerizable immobilizing agent, then mixing the immobilizing agent containing the yeast with a polymeric catalyst, making this mixture into a liquid form, and making it hydrophobic. Granules can be dropped into the solution, or alginate can be added to the fixative as an auxiliary agent in advance, and the solution can be dropped into an aqueous solution of polyvalent metal ions to form spherical droplets with an insoluble film. It is produced by polymerization in the state.
また、固定化酵母槽１０で分解処理された処理水は次段
に設けた輪虫培養槽１４に連絡路１６により供給される
ものとなっている。輪虫培養槽１４は輪虫類を培養し、
前段の固定化酵母槽１０からの供給水中における浮遊酵
母を摂食させる。この輪虫培養槽１４には輪虫類と処理
水とを分別するための分離手段１８が設けられており、
槽壁に沿ってバッファ板２０を設けることにより、バッ
ファ板２０と槽壁の間に輪虫類の自然沈降部２２を形成
している。この自然沈降部２２の上部にはプランクトン
ネット２４で仕切られた側梁２６が設けられ、ネット２
４で輪虫類を取り除いた処理水が導かれ、当該側条２６
から出口管路２８を通じて系外に排出されるようになっ
ている。Further, the treated water decomposed in the immobilized yeast tank 10 is supplied to a rotifer culture tank 14 provided at the next stage through a communication path 16. The rotifer culture tank 14 cultivates rotifers,
The floating yeast in the water supplied from the immobilized yeast tank 10 in the previous stage is fed. This rotifer culture tank 14 is provided with a separation means 18 for separating rotifers and treated water.
By providing the buffer plate 20 along the tank wall, a natural settling section 22 for rotifers is formed between the buffer plate 20 and the tank wall. A side beam 26 partitioned by a plankton net 24 is provided at the upper part of this natural sedimentation part 22, and the net 2
4, the treated water from which rotifers have been removed is led to the side strip 26.
It is designed to be discharged from the system through an outlet pipe 28.
なお、前記固定化酵母槽１０および輪虫培養槽１４には
曝気配管３０が接続され、槽内エアレーションを行うよ
うにしている。また、輪虫培養槽１４の槽底にはドレン
管３２が取付けられている。Note that an aeration pipe 30 is connected to the immobilized yeast tank 10 and the rotifer culture tank 14 to perform aeration within the tank. Further, a drain pipe 32 is attached to the bottom of the rotifer culture tank 14.
上述のような、汚水処理側薬２Ｇを用いて実際の処理を
次のように行った。Actual treatment was carried out as follows using the sewage treatment agent 2G as described above.
支施貫」
ヘプトン、肉エキスを主体とした合成廃水ＢＯＤ １０
０ ｍｇ／ １を用いて処理を行った。酵母はＳａｃｃ
−ｈａｒｏｍｙｃｅｓ ｃｅｒｅｖｉｓｉａｅ Ｉ
Ａ Ｍ５４１２を用いた９輪生は活性汚泥中から分離し
たものを用いた。それぞれの槽の運転条件は下記のとお
りである。Synthetic wastewater BOD 10 mainly composed of hepton and meat extract
Treatment was performed using 0 mg/1. Yeast is Sacc
-haromyces cerevisiae I
For 9 whorls using A M5412, one separated from activated sludge was used. The operating conditions for each tank are as follows.
固定化酵母槽：滞留時間２時間、温度２０°Ｃ１固定化
酵母充填率２０％
（ｔ！ＩＴ定化酵帰化酵母リルアミドで包括固定した２
、６■φ球状のも
のを使用）
輪生壇養槽 ：滞留時間１２時間、温度２５°Ｃ装置は
第１図のものを用いた。Immobilized yeast tank: Residence time 2 hours, temperature 20°C 1 Immobilized yeast filling rate 20% (t! IT fixed fermentation naturalized yeast comprehensively immobilized with lylamide 2
, 6 φ spherical shape) Rotating bed cultivation tank: Residence time 12 hours, temperature 25°C The device shown in Figure 1 was used.
本発明では余剰汚泥として輸出が生産されＢＯＤ変換率
で２％であった。In the present invention, export was produced as surplus sludge, and the BOD conversion rate was 2%.
本発明での輪虫培養槽内には輸出を４００〜１０００匹
／ｄ保持できた。In the present invention, 400 to 1000 rotifers/day could be maintained in the rotifer culture tank.
本発明の処理水質はＢＯＤ２０ｆｆＩｇ／ｌ以下であっ
た。The quality of the treated water according to the present invention was BOD 20ffIg/l or less.
比較のため、標準活性汚泥法で処理し最近フロックの余
剰汚泥を測定した所、ＢＯＤ変換率４０〜５０％であっ
た。For comparison, excess sludge from flocs treated with the standard activated sludge method was recently measured, and the BOD conversion rate was 40-50%.
実１目１又
実施例１と同じ条件で、食品廃水Ｂ ＯＤ １２０■／
ｆの処理を行った０本発明では輸出がよく生育したがＢ
ＯＤ変換率４％であった。輪虫培養槽内には輸出が３０
０〜６００匹／Ｉ＃１保持できた。実施例１よりもＢＯ
Ｄ変換率が高いのは食品廃水中のＳＳ成分に起因するも
のと考えられる。Under the same conditions as Example 1, food wastewater B OD 120/
Exports grew well in the present invention treated with f, but B
The OD conversion rate was 4%. There are 30 exports in the rotifer culture tank.
0 to 600 animals/I#1 could be maintained. BO than Example 1
The high D conversion rate is considered to be due to the SS component in food wastewater.
このときも標準活性汚泥法で処理した場合ＢＯＤ変換率
４０〜５０％であった。処理水はＢ ＯＤ １０ｍｇ／
ｉ以下であった。Also in this case, the BOD conversion rate was 40 to 50% when treated by the standard activated sludge method. Treated water has BOD 10mg/
It was below i.
なお、前記実施例においては、従来の如く廃水処理での
フロックを形成させる必要がないので、固定化酵母槽１
０での滞留時間を更に短くすることができ、酵母菌を白
濁状態で一種のバルキングのようにして高負荷運転する
ことも可能である。また、生成した輪虫類はプランクト
ンネット等で回収し、魚の餌として利用することができ
る。In addition, in the above embodiment, since there is no need to form flocs in wastewater treatment as in the conventional case, the immobilized yeast tank 1
The residence time at 0 can be further shortened, and it is also possible to operate under high load by keeping the yeast in a cloudy state as a kind of bulking. In addition, the rotifers produced can be collected with a plankton net or the like and used as food for fish.
以上説明したように、本発明に係る廃水処理装置によれ
ば、廃水を酵母菌で分解処理するとともに酵母を優生増
殖させ、この浮遊酵母を輪虫類に摂食させるようにした
ため、ＢＯＤ変換率が極めて低くなり、余剰汚泥の発生
量が少なく、かつ余剰汚泥としての輪虫類の処理が容易
となる効果が得られる。As explained above, according to the wastewater treatment device according to the present invention, wastewater is decomposed by yeast, the yeast is allowed to grow eugenically, and the floating yeast is fed to rotifers, so the BOD conversion rate is is extremely low, the amount of surplus sludge generated is small, and the effects of easy treatment of rotifers as surplus sludge can be obtained.
第１図は実施例に係る廃水処理装置の構成図である。
１０−一一一固定化酵母槽、１４−・・輸出培養槽、１
８−分離手段。
出願人 日立プラント建設株式会社゛
第１図FIG. 1 is a configuration diagram of a wastewater treatment apparatus according to an embodiment. 10-111 immobilized yeast tank, 14-...export culture tank, 1
8- Separation means. Applicant Hitachi Plant Construction Co., Ltd. Figure 1
Claims (1)
る廃水処理装置において、固定化酵母が充填され廃水が
導入される固定化酵母槽と、この固定化酵母槽から浮遊
酵母を含有する処理水が導入されるとともに輪虫類を充
填している輪虫培養槽と、この輪虫培養槽に併設されて
輪虫類と処理水を分離する分離手段とを備えたことを特
徴とする廃水処理装置。(1) A wastewater treatment device that biologically decomposes organic matter in wastewater using microorganisms includes an immobilized yeast tank filled with immobilized yeast and into which wastewater is introduced, and a process that contains floating yeast from this immobilized yeast tank. Wastewater characterized by comprising a rotifer culture tank into which water is introduced and filled with rotifers, and a separation means attached to the rotifer culture tank to separate the rotifers and the treated water. Processing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12914587A JPS63294990A (en) | 1987-05-27 | 1987-05-27 | Waste water treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12914587A JPS63294990A (en) | 1987-05-27 | 1987-05-27 | Waste water treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63294990A true JPS63294990A (en) | 1988-12-01 |
Family
ID=15002240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12914587A Pending JPS63294990A (en) | 1987-05-27 | 1987-05-27 | Waste water treatment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63294990A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110099A (en) * | 1990-08-31 | 1992-04-10 | Konichi Komatsu | Method and device for purifying sewage |
| WO2007125598A1 (en) * | 2006-04-28 | 2007-11-08 | Kurita Water Industries Ltd. | Method and apparatus for biologically treating organic discharged water |
-
1987
- 1987-05-27 JP JP12914587A patent/JPS63294990A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110099A (en) * | 1990-08-31 | 1992-04-10 | Konichi Komatsu | Method and device for purifying sewage |
| WO2007125598A1 (en) * | 2006-04-28 | 2007-11-08 | Kurita Water Industries Ltd. | Method and apparatus for biologically treating organic discharged water |
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