JPH03232597A - Treatment of organic waste water - Google Patents
Treatment of organic waste waterInfo
- Publication number
- JPH03232597A JPH03232597A JP2028730A JP2873090A JPH03232597A JP H03232597 A JPH03232597 A JP H03232597A JP 2028730 A JP2028730 A JP 2028730A JP 2873090 A JP2873090 A JP 2873090A JP H03232597 A JPH03232597 A JP H03232597A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- sludge
- liquid
- denitrification
- mixture
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 239000010815 organic waste Substances 0.000 title 1
- 239000010802 sludge Substances 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000012528 membrane Substances 0.000 claims abstract description 34
- 238000005273 aeration Methods 0.000 claims abstract description 16
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 12
- 241000894006 Bacteria Species 0.000 claims abstract description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 7
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims description 11
- 239000010800 human waste Substances 0.000 claims description 10
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 229910017464 nitrogen compound Inorganic materials 0.000 claims description 3
- 150000002830 nitrogen compounds Chemical class 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract 4
- 238000007254 oxidation reaction Methods 0.000 abstract 4
- 230000015556 catabolic process Effects 0.000 abstract 2
- 238000000354 decomposition reaction Methods 0.000 abstract 2
- 238000006731 degradation reaction Methods 0.000 abstract 2
- 239000008394 flocculating agent Substances 0.000 abstract 2
- 239000006228 supernatant Substances 0.000 abstract 2
- 238000005406 washing Methods 0.000 abstract 1
- 238000000108 ultra-filtration Methods 0.000 description 20
- 238000009825 accumulation Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- -1 hydroxide ions Chemical class 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はし尿や浄化槽汚泥などの有機性廃水の処理方法
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for treating organic wastewater such as human waste and septic tank sludge.
従来の技術
従来、し尿処理場においてはし尿とともに浄化槽汚泥や
場内清掃水が投入され、高濃度の有機性廃水を処理して
おり、このような有機性廃水を処理する方法としてたと
えば第２図にしめずようなものがある。第２図において
、し尿１および浄化槽汚泥２よりなる有機性廃水は前処
理工程３を経た後に反応槽４に投入される。この前処理
工程３は、スクリーンや沈殿槽で形成されてし尿１に含
まれたし渣の除去、反応槽４における活性汚泥処理の負
荷を軽減するためのＢＯＤ除去を行っている。さらに、
前処理工程３を終えて反応槽４に投入された有機性廃水
は活性汚泥との混合により混合液として反応槽４に貯留
される。そして、反応槽４においては散気管５から散気
する曝気空気量を調整することにより反応槽４に脱窒素
環境と硝化環境を間欠的に形成して混合液中のＢＯＤ除
去および窒素除去を行う。また、反応槽４に浸漬された
限外濾過膜装置６によって混合液を固液分離し、限外濾
過膜を透過した透過水を処理水７として抽出するととも
に、限外濾過膜面に形成された活性汚泥のゲル層を曝気
空気により生じる上昇撹拌流によって洗浄していた。Conventional technology Conventionally, in human waste treatment plants, septic tank sludge and in-house cleaning water are input together with human waste to treat highly concentrated organic wastewater. There is something that makes me feel sad. In FIG. 2, organic wastewater consisting of human waste 1 and septic tank sludge 2 is charged into a reaction tank 4 after passing through a pretreatment step 3. This pre-treatment step 3 removes human waste formed in the screen or settling tank and contained in the human waste 1, and removes BOD to reduce the load of activated sludge treatment in the reaction tank 4. moreover,
The organic wastewater charged into the reaction tank 4 after completing the pretreatment step 3 is mixed with activated sludge and stored in the reaction tank 4 as a mixed liquid. Then, in the reaction tank 4, by adjusting the amount of aeration air diffused from the aeration pipe 5, a denitrification environment and a nitrification environment are intermittently created in the reaction tank 4, thereby removing BOD and nitrogen from the mixed liquid. . In addition, the mixed liquid is separated into solid and liquid by the ultrafiltration membrane device 6 immersed in the reaction tank 4, and the permeated water that has passed through the ultrafiltration membrane is extracted as treated water 7. The gel layer of activated sludge was washed by an upward stirring flow generated by aerated air.
発明が解決しようとする課題
しかし、上記した構成においては、浄化槽汚泥２に混入
している油脂分が限外濾過膜に付着し、透過効率が低下
する問題があった。また、前処理工程３を施すことによ
って混合液中のＢＯＤおよび窒素負荷が低下するので、
反応槽４においては少ない曝気空気量で硝化が進み限外
濾過膜を洗浄するための十分な曝気強度を維持すること
ができない問題があり、水素供与体としてのＢＯＤが不
足するために硝化によって生じた亜硝酸や硝酸を還元し
て十分な脱窒素をおこなうことができず、反応槽４が硝
酸型となってｐＨ値が低下し、活性汚泥生物に悪影響を
与える問題があった。Problems to be Solved by the Invention However, in the above-described configuration, there was a problem in that oil and fat mixed in the septic tank sludge 2 adhered to the ultrafiltration membrane, resulting in a decrease in permeation efficiency. In addition, by performing pretreatment step 3, the BOD and nitrogen load in the mixed liquid are reduced.
In reaction tank 4, nitrification progresses with a small amount of aerated air, and there is a problem that it is not possible to maintain sufficient aeration intensity to clean the ultrafiltration membrane. There was a problem in that sufficient denitrification could not be achieved by reducing the nitrous acid and nitric acid, and the reaction tank 4 became nitric acid type, resulting in a decrease in pH value and adversely affecting activated sludge organisms.
本発明は上記課題を解決するもので、限外濾過膜の透過
効率の低下を防止できるとともに、十分に脱窒素を行う
ことができる有機性廃水の処理方法を提供することを目
的とする。The present invention solves the above-mentioned problems, and aims to provide a method for treating organic wastewater that can prevent a decrease in the permeation efficiency of an ultrafiltration membrane and can perform sufficient denitrification.
課題を解決するための手段
上記課題を解決するために本発明は、凝集剤を添加され
た浄化槽汚泥を分離装置に投入して浄化槽汚泥の脱離液
を抽出し、この脱離液とスクリーンを通過したし尿とを
合わせた有機性廃水を脱窒累積に投入し、脱窒累積にお
いて有機性廃水と活性汚泥とを混合して混合液を形成す
るとともに、混合液中の有機物を脱窒素菌の硝酸呼吸お
よび亜硝酸呼吸により酸化分解し、さらに混合液を硝化
槽に投入して曝気しながら混合液中の窒素化合物を硝化
菌により硝酸および亜硝酸に酸化分解し、この硝酸およ
び亜硝酸を循環硝化液として脱窒累積に循環させて脱窒
素菌の硝酸呼吸および亜硝酸呼吸により窒素ガスに還元
し、硝化槽に浸漬された濾過膜装置によって混合液を固
液分離し、濾過膜を透過した透過水を処理水として抽出
するとともに、濾過膜面に捕捉された活性汚泥のゲル層
を曝気により生じる上昇撹拌流によって洗浄する構成と
したものである。Means for Solving the Problems In order to solve the above problems, the present invention introduces septic tank sludge to which a flocculant has been added into a separation device, extracts a desorbed liquid from the septic tank sludge, and separates this desorbed liquid and a screen. The organic wastewater combined with the passed human waste is input to the denitrification accumulation, and in the denitrification accumulation, the organic wastewater and activated sludge are mixed to form a mixed solution, and the organic matter in the mixed solution is absorbed by denitrifying bacteria. The mixed solution is oxidized and decomposed by nitrate respiration and nitrite respiration, and the mixed solution is then put into a nitrification tank and, while being aerated, the nitrogen compounds in the mixed solution are oxidized and decomposed by nitrifying bacteria into nitric acid and nitrite, and the nitric acid and nitrite are recycled. The mixture was circulated as a nitrification solution through the denitrification accumulation and reduced to nitrogen gas through nitrate respiration and nitrite respiration by denitrification bacteria, and the mixed liquid was separated into solid and liquid by a filtration membrane device immersed in the nitrification tank, and passed through the filtration membrane. The structure is such that permeated water is extracted as treated water, and the gel layer of activated sludge captured on the filtration membrane surface is washed by an upward stirring flow generated by aeration.
作用
上記した構成により、凝集剤の添加によって分離装置に
おいて浄化槽汚泥中の油脂分が除去され、限外濾過膜の
目詰まりが防止される。さらに、分離装置において脱離
液に含まれるＢＯＤが低下するが、独立した脱窒累積に
おいて脱窒素を行えるので嫌気性の脱窒素環境を形成し
て十分な脱窒素を行うことができる。また、脱窒累積に
おける脱窒素反応により硝化槽に流入する混合液中に水
酸化イオンが含まれるので、硝化槽における硝化反応に
よって生じる水素イオンが中和され、硝化槽のｐＨが安
定され、活性汚泥生物に対する悪影響が防止できる。そ
して、硝化槽が独立しているので硝化反応だけを行うこ
とができ、常に所定の曝気強度をもって曝気することが
できるので、限外濾過膜の膜面に対する洗浄を十分に行
って透過効率の低下を防止することができる。Effect: With the above-described configuration, the oil and fat content in the septic tank sludge is removed in the separation device by adding the flocculant, and clogging of the ultrafiltration membrane is prevented. Furthermore, although the BOD contained in the denitrified liquid decreases in the separation device, since denitrification can be performed in independent denitrification accumulation, it is possible to form an anaerobic denitrification environment and perform sufficient denitrification. In addition, since hydroxide ions are included in the mixed liquid flowing into the nitrification tank due to the denitrification reaction during denitrification accumulation, the hydrogen ions generated by the nitrification reaction in the nitrification tank are neutralized, the pH of the nitrification tank is stabilized, and the nitrification tank is activated. Negative effects on sludge organisms can be prevented. Since the nitrification tank is independent, only the nitrification reaction can be carried out, and aeration can always be carried out at a predetermined aeration intensity, so the membrane surface of the ultrafiltration membrane can be thoroughly cleaned and the permeation efficiency can be reduced. can be prevented.
実施例
以下本発明の一実施例を図面に基づいて説明する。第１
図において、嫌気性の脱窒累積１１には浄化槽汚泥１２
の汚泥供給路１３とし尿１４のし圧供給路１５が連通し
ている。そして、汚泥供給路１３の途中には遠心分離機
やベルトプレスなどの分離装置１６が介装されるととも
に、遠心分離機１６の上流側に位置してポリマーなどの
凝集剤１７の薬剤供給路１８が連通しており、し圧供給
路１５の途中にはスクリーン１９が介装されている。ま
た、脱窒累積１１は送液路２０を介して好気性の硝化槽
２１に連通しており、硝化槽２１には限外濾過膜装置２
２が浸漬されている。EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, anaerobic denitrification accumulation 11 includes septic tank sludge 12.
The sludge supply path 13 and the night soil pressure supply path 15 of the night soil 14 are in communication. A separation device 16 such as a centrifugal separator or a belt press is interposed in the middle of the sludge supply path 13, and a chemical supply path 18 for a flocculant 17 such as a polymer is located upstream of the centrifuge 16. are in communication with each other, and a screen 19 is interposed in the middle of the pressure supply path 15. Further, the denitrification accumulation 11 is connected to an aerobic nitrification tank 21 via a liquid supply path 20, and an ultrafiltration membrane device 2 is connected to the nitrification tank 21.
2 is immersed.
この限外濾過膜装置２２は平膜式に形成されており、負
圧側が吸引ポンプ２３に連通している。さらに、限外濾
過膜装置２２には超音波端子部２４が取付けられており
、超音波端子部２４は超音波発振器２５に接続されてい
る。そして、限外濾過膜装置２２の下方に位置して散気
管２Ｂが配置されており、散気管２Ｂはブロワ−２７に
連通している。また、硝化槽２１と脱窒薬槽１１を連通
して循環路２８が設けられており、循環路２８の途中に
は循環ポンプ２９が介装されている。This ultrafiltration membrane device 22 is formed in a flat membrane type, and the negative pressure side communicates with the suction pump 23. Furthermore, an ultrasonic terminal section 24 is attached to the ultrafiltration membrane device 22, and the ultrasonic terminal section 24 is connected to an ultrasonic oscillator 25. A diffuser pipe 2B is arranged below the ultrafiltration membrane device 22, and the diffuser pipe 2B communicates with the blower 27. Further, a circulation path 28 is provided to communicate the nitrification tank 21 and the denitrification tank 11, and a circulation pump 29 is interposed in the middle of the circulation path 28.
以下、上記構成における作用について説明する。Hereinafter, the effects of the above configuration will be explained.
浄化槽汚泥１２に薬剤供給路１８から凝集剤１７を添加
し、凝集剤１７を添加された浄化槽汚泥１２を汚泥供給
路１３から分離装置１６に投入して浄化槽汚泥１２の脱
離液を抽出する。この脱離液にスクリーン１９を通過し
てし圧供給路１５を流れるし尿１４を合わせ、有機性廃
水として脱窒薬槽１１に投入する。そして、脱窒薬槽１
１において有機性廃水と活性汚泥とを混合して混合液を
形成するとともに、混合液中の有機物を脱窒素菌の硝酸
呼吸および亜硝酸呼吸により酸化分解する。また、混合
液を送液路２０を介して硝化槽２１に投入し、ブロワ−
２７により供給される空気を散気管２６から散気して混
合液を曝気しながら混合液中の窒素化合物を硝化菌によ
り硝酸および亜硝酸に酸化分解する。さらに、硝化槽２
１の硝酸および亜硝酸を循環硝化液として循環ポンプ２
９により循環路２８を通して脱窒薬槽に循環させ、脱窒
素菌の硝酸呼吸および亜硝酸呼吸により窒素ガスに還元
する。このとき、脱窒薬槽１１に滞留する混合液中のＢ
ＯＤは、浄化槽汚泥中のＢＯＤが分離装置１６において
除去されるために、少ないものであるが、独立した脱窒
薬槽１１において脱窒素を行えるので嫌気性の脱窒素環
境を形成して十分な脱窒素を行うことができる。また、
脱窒薬槽１１における脱窒素反応により混合液中に水酸
化イオンが含まれるので、硝化槽２１における硝化反応
によって生じる水素イオンが中和され、硝化槽２１のｐ
Ｈが安定されて活性汚泥生物に対する悪影響が防止され
る。そして、硝化槽２１の混合液を吸引ポンプ２３によ
り限外濾過膜装置２２を通して吸引し、限外濾過膜を透
過した透過水を処理水として抽出する。このとき、混合
液中の油脂分は浄化槽汚泥１２に対する凝集剤１７の添
加により分離装置１６において除去されているので、限
外濾過膜が油脂分で目詰まることがない。そして、限外
濾過膜面に形成された活性汚泥のゲル層を散気管２６か
ら散気される空気のエアリフト作用により生じる上昇撹
拌流によって洗浄する。このとき、硝化槽２１が独立し
ているので硝化反応だけを行うことができ、常に所定の
曝気強度をもって曝気することができるので、限外濾過
膜の膜面に対する洗浄を十分に行って透過効率の低下を
防止することができる。しかし、曝気強度をあまり強く
すると活性汚泥フロックが壊れる危険があるので、超音
波発振器２５により超音波端子部２４から超音波を限外
濾過膜に発信し、振動する膜面と混合液との干渉によっ
て活性汚泥フロックを壊すことなく活性汚泥を剥離させ
る。そして、硝化槽２１に滞留する活性汚泥を返送汚泥
として硝化循環液とともに循環路２８を通って脱窒薬槽
１１に戻す。A flocculant 17 is added to the septic tank sludge 12 from the chemical supply path 18, and the septic tank sludge 12 to which the flocculant 17 has been added is fed into the separation device 16 from the sludge supply path 13 to extract the desorbed liquid of the septic tank sludge 12. This desorbed liquid is combined with the human waste 14 that has passed through the screen 19 and flows through the pressure supply path 15, and the mixture is charged into the denitrification tank 11 as organic wastewater. And denitrification tank 1
In Step 1, organic wastewater and activated sludge are mixed to form a mixed solution, and organic matter in the mixed solution is oxidized and decomposed by nitrate respiration and nitrite respiration of denitrifying bacteria. In addition, the mixed liquid is introduced into the nitrification tank 21 via the liquid supply path 20, and the blower
27 is diffused through the aeration tube 26 to aerate the mixed liquid, and the nitrogen compounds in the mixed liquid are oxidized and decomposed into nitric acid and nitrous acid by nitrifying bacteria. Furthermore, nitrification tank 2
Circulating pump 2 uses nitric acid and nitrous acid from 1 as circulating nitrifying liquid.
9, the denitrifying agent is circulated through the circulation path 28 to the denitrifying agent tank, and is reduced to nitrogen gas through nitrate respiration and nitrite respiration of the denitrifying bacteria. At this time, B in the mixed liquid staying in the denitrification chemical tank 11
OD is small because BOD in the septic tank sludge is removed in the separation device 16, but since denitrification can be performed in the independent denitrification chemical tank 11, an anaerobic denitrification environment is created and sufficient Denitrification can be performed. Also,
Since hydroxide ions are included in the mixed liquid due to the denitrification reaction in the denitrification chemical tank 11, the hydrogen ions generated by the nitrification reaction in the nitrification tank 21 are neutralized, and the p of the nitrification tank 21 is
H is stabilized and adverse effects on activated sludge organisms are prevented. Then, the mixed liquid in the nitrification tank 21 is sucked through the ultrafiltration membrane device 22 by the suction pump 23, and the permeated water that has passed through the ultrafiltration membrane is extracted as treated water. At this time, since the oil content in the mixed liquid is removed in the separation device 16 by adding the flocculant 17 to the septic tank sludge 12, the ultrafiltration membrane is not clogged with oil content. Then, the gel layer of activated sludge formed on the surface of the ultrafiltration membrane is washed by the upward stirring flow generated by the air lift action of the air diffused from the aeration pipe 26. At this time, since the nitrification tank 21 is independent, only the nitrification reaction can be carried out, and aeration can always be carried out at a predetermined aeration intensity, so that the membrane surface of the ultrafiltration membrane can be sufficiently cleaned to improve the permeation efficiency. It is possible to prevent a decrease in However, if the aeration intensity is too strong, there is a risk that the activated sludge flocs will break, so the ultrasonic oscillator 25 transmits ultrasonic waves from the ultrasonic terminal part 24 to the ultrafiltration membrane to prevent interference between the vibrating membrane surface and the mixed liquid. Activated sludge is separated without destroying activated sludge flocs. Then, the activated sludge retained in the nitrification tank 21 is returned to the denitrification tank 11 through the circulation path 28 together with the nitrification circulating liquid as return sludge.
発明の効果
以上述べたように、本発明によれば、凝集剤の添加によ
って浄化槽汚泥中の油脂分を除去することにより、限外
濾過膜の目詰まりを防止することができ、独立した脱窒
薬槽において脱窒素を行えるので混合液中のＢＯＤが少
なくても嫌気性の脱窒素環境を形成して十分な脱窒素を
行うことができる。また、独立した硝化槽において硝化
反応だけを行うことにより、常に所定の曝気強度をもっ
て曝気することができ、限外濾過膜の膜面に対する洗浄
を十分に行って透過効率の低下を防止することができる
。Effects of the Invention As described above, according to the present invention, clogging of the ultrafiltration membrane can be prevented by removing oil and fat from septic tank sludge by adding a flocculant, and independent denitrification can be performed. Since denitrification can be performed in the chemical tank, even if the BOD in the mixed liquid is small, an anaerobic denitrification environment can be formed and sufficient denitrification can be performed. In addition, by performing only the nitrification reaction in an independent nitrification tank, aeration can always be carried out at a predetermined aeration intensity, and the membrane surface of the ultrafiltration membrane can be sufficiently cleaned to prevent a decrease in permeation efficiency. can.
第１図は本発明の一実施例を示す全体構成図、第２図は
従来の処理設備の全体構成図である。
１１・・・脱窒薬槽、１２・・・浄化槽汚泥、１４・・
・し尿、１６・・・分離装置、１９・・・スクリーン、
２１・・・硝化槽、２２・・・限外濾過膜装置、２６・
・・散気管。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is an overall configuration diagram of conventional processing equipment. 11... Denitrification tank, 12... Septic tank sludge, 14...
- Human waste, 16...Separation device, 19...Screen,
21... Nitrification tank, 22... Ultrafiltration membrane device, 26.
...Aeration pipe.
Claims (1)
て浄化槽汚泥の脱離液を抽出し、この脱離液とスクリー
ンを通過したし尿とを合わせた有機性廃水を脱窒素槽に
投入し、脱窒素槽において有機性廃水と活性汚泥とを混
合して混合液を形成するとともに、混合液中の有機物を
脱窒素菌の硝酸呼吸および亜硝酸呼吸により酸化分解し
、さらに混合液を硝化槽に投入して曝気しながら混合液
中の窒素化合物を硝化菌により硝酸および亜硝酸に酸化
分解し、この硝酸および亜硝酸を循環硝化液として脱窒
素槽に循環させて脱窒素菌の硝酸呼吸および亜硝酸呼吸
により窒素ガスに還元し、硝化槽に浸漬された濾過膜装
置によって混合液を固液分離し、濾過膜を透過した透過
水を処理水として抽出するとともに、濾過膜面に形成さ
れた活性汚泥のゲル層を曝気により生じる上昇撹拌流に
よって洗浄することを特徴とする有機性廃水の処理方法
。1. Pour the septic tank sludge to which a flocculant has been added into a separation device to extract the desorbed liquid from the septic tank sludge, and then input the organic wastewater, which is a combination of this desorbed liquid and the human waste that has passed through the screen, into the denitrification tank. Then, in a denitrification tank, organic wastewater and activated sludge are mixed to form a mixed solution, and the organic matter in the mixed solution is oxidized and decomposed by denitrifying bacteria through nitrate respiration and nitrite respiration, and the mixed solution is further nitrified. Nitrogen compounds in the mixed solution are oxidized and decomposed into nitric acid and nitrite by nitrifying bacteria while being aerated into the tank, and the nitric acid and nitrous acid are circulated to the denitrification tank as a circulating nitrification solution, where the denitrifying bacteria respire nitrate. The mixture is reduced to nitrogen gas by nitrite respiration, the mixed liquid is separated into solid and liquid by a filtration membrane device immersed in a nitrification tank, and the permeated water that has passed through the filtration membrane is extracted as treated water. A method for treating organic wastewater, characterized in that a gel layer of activated sludge is washed by an upward stirring flow generated by aeration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2028730A JPH0659478B2 (en) | 1990-02-08 | 1990-02-08 | Organic wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2028730A JPH0659478B2 (en) | 1990-02-08 | 1990-02-08 | Organic wastewater treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03232597A true JPH03232597A (en) | 1991-10-16 |
| JPH0659478B2 JPH0659478B2 (en) | 1994-08-10 |
Family
ID=12256552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2028730A Expired - Lifetime JPH0659478B2 (en) | 1990-02-08 | 1990-02-08 | Organic wastewater treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0659478B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868934A (en) * | 1996-05-28 | 1999-02-09 | Sharp Kabushiki Kaisha | Method and apparatus for organic wastewater treatment capable of preventing decrease in permeation efficiency of submerged membrane without dilution |
| JP2003019496A (en) * | 2001-07-09 | 2003-01-21 | Kubota Corp | Water treatment equipment performing nitrogen removal |
| JP2006314908A (en) * | 2005-05-12 | 2006-11-24 | Mitsubishi Heavy Ind Ltd | Organic waste water treatment method and system |
| JP2009208012A (en) * | 2008-03-05 | 2009-09-17 | Japan Organo Co Ltd | Water treating method and water treating apparatus |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5879596A (en) * | 1981-11-04 | 1983-05-13 | Ebara Infilco Co Ltd | Treatment for night soil and sludge of septic tank by mixing |
| JPS61120694A (en) * | 1984-11-19 | 1986-06-07 | Mitsubishi Kakoki Kaisha Ltd | Treatment of organic waste water |
| JPS61129094A (en) * | 1984-11-26 | 1986-06-17 | Nitto Electric Ind Co Ltd | Apparatus for treating membrane |
| JPS61287499A (en) * | 1985-06-12 | 1986-12-17 | Kubota Ltd | Treatment of organic sewage |
| JPS6265795A (en) * | 1985-09-19 | 1987-03-25 | Mitsubishi Heavy Ind Ltd | Treatment of high concentration waste water |
| JPS62221493A (en) * | 1986-03-25 | 1987-09-29 | Japan Organo Co Ltd | Method for treating membrane bioreactor |
| JPH01119397A (en) * | 1987-10-30 | 1989-05-11 | Akua Runesansu Gijutsu Kenkyu Kumiai | Water treatment equipment |
-
1990
- 1990-02-08 JP JP2028730A patent/JPH0659478B2/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5879596A (en) * | 1981-11-04 | 1983-05-13 | Ebara Infilco Co Ltd | Treatment for night soil and sludge of septic tank by mixing |
| JPS61120694A (en) * | 1984-11-19 | 1986-06-07 | Mitsubishi Kakoki Kaisha Ltd | Treatment of organic waste water |
| JPS61129094A (en) * | 1984-11-26 | 1986-06-17 | Nitto Electric Ind Co Ltd | Apparatus for treating membrane |
| JPS61287499A (en) * | 1985-06-12 | 1986-12-17 | Kubota Ltd | Treatment of organic sewage |
| JPS6265795A (en) * | 1985-09-19 | 1987-03-25 | Mitsubishi Heavy Ind Ltd | Treatment of high concentration waste water |
| JPS62221493A (en) * | 1986-03-25 | 1987-09-29 | Japan Organo Co Ltd | Method for treating membrane bioreactor |
| JPH01119397A (en) * | 1987-10-30 | 1989-05-11 | Akua Runesansu Gijutsu Kenkyu Kumiai | Water treatment equipment |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868934A (en) * | 1996-05-28 | 1999-02-09 | Sharp Kabushiki Kaisha | Method and apparatus for organic wastewater treatment capable of preventing decrease in permeation efficiency of submerged membrane without dilution |
| JP2003019496A (en) * | 2001-07-09 | 2003-01-21 | Kubota Corp | Water treatment equipment performing nitrogen removal |
| JP2006314908A (en) * | 2005-05-12 | 2006-11-24 | Mitsubishi Heavy Ind Ltd | Organic waste water treatment method and system |
| JP2009208012A (en) * | 2008-03-05 | 2009-09-17 | Japan Organo Co Ltd | Water treating method and water treating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0659478B2 (en) | 1994-08-10 |
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