JPS6351075B2 - - Google Patents
Info
- Publication number
- JPS6351075B2 JPS6351075B2 JP60141269A JP14126985A JPS6351075B2 JP S6351075 B2 JPS6351075 B2 JP S6351075B2 JP 60141269 A JP60141269 A JP 60141269A JP 14126985 A JP14126985 A JP 14126985A JP S6351075 B2 JPS6351075 B2 JP S6351075B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- stage
- treatment
- wastewater
- bod
- 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.)
- Expired
Links
- 239000010802 sludge Substances 0.000 claims description 68
- 239000002351 wastewater Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 9
- 241001465754 Metazoa Species 0.000 claims description 7
- 238000005273 aeration Methods 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 230000000813 microbial effect Effects 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 235000010469 Glycine max Nutrition 0.000 description 3
- 244000068988 Glycine max Species 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000700141 Rotifera Species 0.000 description 1
- 208000002474 Tinea Diseases 0.000 description 1
- 241000893966 Trichophyton verrucosum Species 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、有機汚濁廃水の活性汚泥処理におけ
るバルキングの防止および余剰汚泥量の減少に有
効な２段式微生物処理法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a two-stage microbial treatment method that is effective in preventing bulking and reducing the amount of excess sludge in activated sludge treatment of organic polluted wastewater.
＜従来技術と問題点＞
活性汚泥法は有機汚濁廃水の処理に広く採用さ
れているが、完全混合ばつ気方式で連続的に活性
汚泥処理を行うと食品関係の有機汚濁廃水の種類
によつてはバルキングを起し易く、また、余剰汚
泥量も多い等の問題を有している。特にバルキン
グは、発生原因が明らかでない例が多いため、そ
の対策に苦慮しており、有機汚濁廃水処理におけ
るバルキング防止および余剰汚泥量減少のための
技術が強く要望されている。<Prior art and problems> The activated sludge method has been widely adopted for the treatment of organically contaminated wastewater, but when activated sludge treatment is performed continuously using a complete mixing aeration method, depending on the type of food-related organically contaminated wastewater, has problems such as being prone to bulking and having a large amount of surplus sludge. In particular, there are many cases in which the cause of bulking is not clear, so it is difficult to countermeasures against it, and there is a strong demand for technology to prevent bulking and reduce the amount of excess sludge in organic polluted wastewater treatment.
＜発明の目的＞
本発明は、上記の点に鑑み、従来の連続式完全
混合型活性汚泥処理の前段に廃水の単純ばつ気処
理を付加し、高BOD汚泥負荷の下で溶解性汚濁
物質をあらかじめ分解除去して汚泥に転化させ、
第２段の活性汚泥処理にかかるBOD負荷を大幅
に低下させることにより最終的にバルキングの発
生を防止すると同時に、第１段で生成した汚泥を
第２段の括性汚泥中に含まれる高濃度の後生動物
および原生動物等の微小動物により除去し、余剰
汚泥の発生量を大幅に減少させ、長期に安定した
有機汚濁廃水の処理を行うものである。<Object of the invention> In view of the above points, the present invention adds simple aeration treatment of wastewater to the previous stage of the conventional continuous fully mixed activated sludge treatment, and removes soluble pollutants under a high BOD sludge load. It is decomposed and removed in advance and converted into sludge.
By significantly reducing the BOD load required for activated sludge treatment in the second stage, bulking is ultimately prevented, and at the same time, the sludge produced in the first stage is transferred to the high concentration contained in the bulk sludge in the second stage. The wastewater is removed by microscopic animals such as metazoa and protozoa, greatly reducing the amount of surplus sludge generated, and providing long-term stable treatment of organic polluted wastewater.
＜発明の構成＞
本発明における第１段処理は既設の活性汚泥処
理槽の一部を仕切るか、または同槽の前にばつ気
槽を新設して行うものであり、その容積は廃水の
水質および量に依存するが、第２段の活性汚泥処
理槽容積と同程度〜1/3容で十分であり、汚泥返
送を行わない一過処理方式とする。廃水の槽滞留
時間は９時間以上とし、廃水中のBOD濃度が高
い場合は適宜槽滞留時間を延長する必要がある。
速やかに処理平衡に到達させるには、廃水あるい
はばつ気槽に直接活性汚泥液やその上澄液を一部
植種する。処理平衡に近づくにつれてばつ気液の
相対粘度が上昇して粘質性のバルキングを起こ
し、ばつ気液中に微細な汚泥塊や非凝集性汚泥が
観察される。汚泥濃度と相対粘度の間にはほぼ直
線的な相関が認められる。ばつ気液の相対粘度は
１〜10の範囲で良好な処理が行われ、COD除去
率は90％前後に達する。相対粘度が10を越えると
槽内における空気かくはん効率が極度に低下し、
適正なDOの維持が困難になるなどの問題を生じ
る。同じ理由によりばつ気液中の汚泥濃度は
1000ppm以下が好ましい。また、廃水中のBOD
濃度は1200ppmを限度とし、これによりBOD濃
度が高い場合は希釈操作を必要とするが、相対粘
度や汚泥濃度の調節はBOD負荷量を変化させる
間接的な方法に加え、ばつ気液を直接希釈する方
法を併用することにより任意に行うことができ
る。第１段におけるBOD汚泥負荷は１Kg／Kg−
ss／日以上、好ましくは２〜５Kg／Kg−ss／日が
適当であり、１Kg／Kg−ss／日以下に低下すると
汚泥塊が凝集肥大化するため、粘質性のバルキン
グから正常な活性汚泥になる。しかし、その場合
でも一過処理方式であれば継続的な処理が可能で
ある。逆にBOD負荷が急激に高くなると、ばつ
気液の相対粘度が増加するためDOが2ppm以下
に低下し酸敗しやすくなる。なお、ばつ気液の相
対粘度はBOD負荷量に対して直線的な比例関係
にあるので、ばつ気液の相対粘度を測定すること
により、BOD負荷の急変を予測することができ
る。ばつ気液のPHは６〜８の中性域が適してお
り、PH６未満では粘性物質が析出するため処理が
行えなくなる。そのほか温度等の条件は通常の活
性汚泥処理条件の範囲内にある。<Structure of the invention> The first stage treatment in the present invention is carried out by partitioning off a part of the existing activated sludge treatment tank or by installing a new aeration tank in front of the tank, whose volume depends on the quality of the wastewater. Although it depends on the amount of sludge, it is sufficient to use the same volume to 1/3 of the volume of the second-stage activated sludge treatment tank, and a one-time treatment method is used in which sludge is not returned. The residence time of wastewater in the tank should be 9 hours or more, and if the BOD concentration in the wastewater is high, the residence time in the tank should be extended as appropriate.
In order to quickly reach treatment equilibrium, a portion of the activated sludge liquid or its supernatant liquid is inoculated directly into the wastewater or aeration tank. As the treatment equilibrium approaches, the relative viscosity of the vapor liquid increases, causing viscous bulking, and fine sludge lumps and non-coagulating sludge are observed in the vapor liquid. A nearly linear correlation is observed between sludge concentration and relative viscosity. Good treatment is achieved when the relative viscosity of the vaporized liquid is in the range of 1 to 10, and the COD removal rate reaches around 90%. If the relative viscosity exceeds 10, the air agitation efficiency in the tank will be extremely reduced.
This causes problems such as difficulty in maintaining an appropriate DO. For the same reason, the sludge concentration in gas and liquid is
It is preferably 1000 ppm or less. Also, BOD in wastewater
The concentration is limited to 1200ppm, and if the BOD concentration is high, a dilution operation is required, but relative viscosity and sludge concentration can be adjusted by indirect methods of changing the BOD load, as well as direct dilution of the gas and liquid. It can be carried out arbitrarily by using the method of BOD sludge load in the first stage is 1Kg/Kg-
ss/day or more, preferably 2 to 5 Kg/Kg-ss/day, is appropriate; if it decreases to 1 Kg/Kg-ss/day or less, the sludge lumps will coagulate and enlarge, so the normal activity will change from viscous bulking. It becomes sludge. However, even in this case, continuous processing is possible if the temporary processing method is used. On the other hand, when the BOD load suddenly increases, the relative viscosity of the gas and liquid increases, causing the DO to drop below 2 ppm and becoming rancid. Note that, since the relative viscosity of the vapor liquid has a linear proportional relationship to the BOD load amount, sudden changes in the BOD load can be predicted by measuring the relative viscosity of the vapor liquid. A neutral pH range of 6 to 8 is suitable for the PH of the vapor liquid, and if the PH is lower than 6, viscous substances will precipitate, making it impossible to perform the treatment. Other conditions such as temperature are within the range of normal activated sludge treatment conditions.
第２段は、完全混合型活性汚泥処理法により未
分解の有機汚濁物質等の除去を行う。第２段の活
性汚濁処理は通常の活性汚泥処理と比べて微小動
物が多く含まれているのが特徴である。微小動物
のうち代表的なものは輪虫などの後生動物および
つりがね虫などの原生動物であり、その濃度は汚
泥濃度約3000ppmのばつ気液１ml当り各々２×
104個と極めて高く、通常の活性汚泥処理時の10
数倍も多く含まれている。これらの微小動物によ
る汚泥のとり込みが盛んに行われ、汚泥量の減少
に寄与している。微小動物の濃度を高くするには
微小動物の好餌となりその増殖を促す汚泥塊や分
散汚泥の濃度を高くする方法が有効である。第１
段処理における汚泥濃度は最高1000ppmである
が、この時微小動物の総数は５×10cells／ml−
ばつ気液にも達する。第２段処理の条件として、
汚泥濃度は2000ppm以上、好ましくは3000ppm前
後とし、温度やDO等は通常の活性汚泥処理の条
件を適用できる。 In the second stage, undecomposed organic pollutants are removed using a completely mixed activated sludge treatment method. The second stage activated sludge treatment is characterized by the fact that it contains more microscopic animals than the normal activated sludge treatment. Typical microfauna are metazoans such as rotifers and protozoa such as ringworms, and their concentrations are 2x each per ml of gas and liquid with a sludge concentration of approximately 3000 ppm.
10 4 , which is extremely high, compared to 10 during normal activated sludge treatment.
Contains several times more. Sludge is actively taken up by these microscopic animals, contributing to a reduction in the amount of sludge. An effective way to increase the concentration of microfauna is to increase the concentration of sludge lumps or dispersed sludge that serve as favorite food for microfauna and encourage their proliferation. 1st
The maximum sludge concentration in stage treatment is 1000 ppm, but the total number of microfauna at this time is 5 × 10 cells/ml.
It also reaches gas and liquid. As a condition for the second stage processing,
The sludge concentration should be 2000 ppm or more, preferably around 3000 ppm, and the temperature, DO, etc., can be the same as normal activated sludge treatment conditions.
以下、本発明を図面により説明する。 Hereinafter, the present invention will be explained with reference to the drawings.
第１図において、廃水は管４を通つて第１段処
理槽に導かれ、粘質性のバルキングを伴うBOD
汚泥負荷１Kg／１Kg−ss／日以上の高負荷で一過
処理されたのち溢流させて第２段処理槽２に導か
れる。第２段処理槽２では汚泥濃度2000ppm以上
で活性汚泥処理されたのち沈殿層３に導かれ、処
理水５として放流される。沈殿槽下部からの濃縮
汚泥は一部第２段処理槽２に返送され、余剰分は
系外に除かれる。散気管７はDO維持のため、
BOD負荷量の変動に対応して調節可能な方式の
ものがよい。 In Figure 1, the wastewater is led to the first stage treatment tank through pipe 4, with BOD with viscous bulking.
After being temporarily treated at a high sludge load of 1 kg/1 kg-ss/day or more, the sludge is overflowed and led to the second stage treatment tank 2. In the second stage treatment tank 2, the activated sludge is treated with a sludge concentration of 2000 ppm or more, and then led to a sedimentation layer 3 and discharged as treated water 5. A portion of the thickened sludge from the lower part of the settling tank is returned to the second stage treatment tank 2, and the surplus is removed from the system. The diffuser pipe 7 is used to maintain DO.
It is best to use a system that can be adjusted in response to changes in BOD load.
＜発明の実施例＞ 以下、実施例について説明する。<Embodiments of the invention> Examples will be described below.
実施例 １
大豆食品工場における大豆煮汁廃水は高BOD
廃水であり、完全混合型活性汚泥処理を行うとバ
ルキングが発生しやすい。実験室段階においても
BOD容積負荷0.12Kg／m3／日で容易にバルキン
グを起こした。そこで、その廃水に当該２段式微
生物処理法の適用を試みた。第１段処理槽および
第２段処理槽（共に２容）の処理条件は次のと
おりである。各槽の廃水滞留時間24時間、
DO2ppm以上、温度25℃、PHは無調節とし、第
２段処理槽の汚泥濃度は約3000ppmとした。
BOD545ppm、COD527ppm、Ｔ−Ｎ（全窒素）
28ppm、Ｔ−PO4（全リン酸）8.9ppmの大豆煮汁
廃水について槽全容積にかかるBOD負荷を0.55
Kg／m3／日として連続処理を行つた。処理平衡に
達したとみなさせる46日目の処理水の分析結果お
よび第２段処理槽の汚泥の性状を各々第１表およ
び第２表に示した。第１表より、BOD除去率は
99％、COD除去率は98％を示し、Ｔ−Ｎおよび
Ｔ−PO4も効果的に除去された。また、表２よ
り、SVI（汚泥容量指標）は52、汚泥転換率は０
％を示すと共に、汚泥中の微小動物数は4.8×
104cells／ml−ばつ気液と通常より極めて高い値
を示すなど、活性汚泥の凝集沈降性は優れており
バルキングの発生は認められなかつた。Example 1 Soybean broth wastewater from a soybean food factory has high BOD
Since it is wastewater, bulking is likely to occur when fully mixed activated sludge treatment is performed. Even at the laboratory stage
Bulking easily occurred at a BOD volumetric load of 0.12 Kg/m 3 /day. Therefore, we attempted to apply the two-stage microbial treatment method to the wastewater. The processing conditions of the first stage treatment tank and the second stage treatment tank (both 2 volumes) are as follows. Wastewater residence time in each tank is 24 hours.
DO was 2ppm or more, temperature was 25℃, PH was not adjusted, and sludge concentration in the second stage treatment tank was approximately 3000ppm.
BOD545ppm, COD527ppm, T-N (total nitrogen)
For soybean broth wastewater with 28ppm and T-PO 4 (total phosphoric acid) 8.9ppm, the BOD load applied to the total tank volume is 0.55.
Continuous treatment was carried out at Kg/m 3 /day. The analysis results of the treated water on the 46th day, when it is considered that treatment equilibrium has been reached, and the properties of the sludge in the second stage treatment tank are shown in Tables 1 and 2, respectively. From Table 1, the BOD removal rate is
The COD removal rate was 99%, and the COD removal rate was 98%, and TN and T-PO 4 were also effectively removed. Also, from Table 2, SVI (sludge capacity index) is 52 and sludge conversion rate is 0.
% and the number of microscopic animals in the sludge is 4.8×
The coagulation and sedimentation properties of the activated sludge were excellent, with a value of 10 4 cells/ml - much higher than normal, and no bulking was observed.
実施例 ２
実施例１と同じ条件下でBOD容積負荷を0.28
および1.1Kg／m3／日とし、２週間以上連続処理
を行つた時の処理水ならびに汚泥の性状を第３表
に示した。同表には、比較のために実施例１の
BOD容積負荷0.55Kg／m3／日の結果も合わせて
示してある。第３表より、BOD容積負荷0.28、
0.55および1.1Kg／m3／日のいずれも処理水の水
質は良好であり、汚泥の沈降性も良く安定かつ長
期に処理が行われた。Example 2 Under the same conditions as Example 1, the BOD volume load was 0.28.
Table 3 shows the properties of treated water and sludge when continuous treatment was carried out for two weeks or more at a rate of 1.1 Kg/m 3 /day. The same table shows Example 1 for comparison.
The results for a BOD volumetric load of 0.55 Kg/m 3 /day are also shown. From Table 3, BOD volumetric load 0.28,
The quality of the treated water was good at both 0.55 and 1.1 Kg/m 3 /day, and the sludge had good sedimentation properties, and the treatment was carried out stably and over a long period of time.
実施例 ３
廃水の槽滞留時間を第１段処理は９時間、第２
段処理は16時間とし、廃水中のBOD濃度を変え
ることによりBOD容積負荷を０〜0.96Kg／m3／
日と変化させ、２週間以上連続処理を行つた。処
理平衡に達した時のBOD濃度と第１段処理ばつ
き気液の相対粘度の関係を第２図に示した。第２
図より、廃水中のBOD濃度の増加と共にばつ気
液の相対粘度は比例的に高くなつた。相対粘度が
10以上に達するとDOの維持が困難になるなど、
処理に支障を来たすことから、処理可能な廃水の
BOD最高濃度は約1200ppmである。第３図は、
第１段処理槽について、廃水のBOD濃度とBOD
汚泥負荷の関係を示したものである。第３図よ
り、BOD汚泥負荷は２〜５Kg／Kg−ss／日の範
囲内にあり、この値は一般的な活性汚泥処理にお
けるBOD汚泥負荷0.2〜0.4Kg／Kg−ss／日と比べ
るとかなり高い。Example 3 The residence time of wastewater in the tank was 9 hours for the first stage treatment and 9 hours for the second stage treatment.
The stage treatment was for 16 hours, and the BOD volume load was varied from 0 to 0.96 Kg/m 3 / by changing the BOD concentration in the wastewater.
The treatment was carried out continuously for more than two weeks, changing the conditions every day. Figure 2 shows the relationship between the BOD concentration when the treatment equilibrium is reached and the relative viscosity of the gas and liquid in the first stage treatment. Second
The figure shows that as the BOD concentration in wastewater increases, the relative viscosity of the gas-liquid increases proportionally. relative viscosity
If it reaches 10 or more, it becomes difficult to maintain DO.
Wastewater that can be treated is
The maximum BOD concentration is approximately 1200ppm. Figure 3 shows
Regarding the first stage treatment tank, BOD concentration and BOD of wastewater
This shows the relationship between sludge loads. From Figure 3, the BOD sludge load is within the range of 2 to 5 Kg/Kg-ss/day, and this value is compared to the BOD sludge load of 0.2 to 0.4 Kg/Kg-ss/day in general activated sludge treatment. Quite expensive.
＜発明の効果＞
本発明は、以上説明したように、有機汚濁廃水
の活性汚泥処理において、従来の完全混合型活性
汚泥処理におけるバルキングを防止すると共に余
剰汚泥量の低減化が可能である。<Effects of the Invention> As described above, the present invention can prevent bulking in conventional fully mixed activated sludge treatment and reduce the amount of excess sludge in activated sludge treatment of organic polluted wastewater.
第１図は２段式微生物処理装置を示す図、第２
図はBOD濃度と相対粘度の関係を示す図、第３
図はBOD濃度とBOD汚泥負荷の関係を示す図で
ある。
図中符号１は第１段処理槽、２は第２段処理
槽、３は沈殿槽、４は廃水管、５は処理水管、６
は汚泥管、７は散気管を示す。
Figure 1 shows a two-stage microbial treatment device;
Figure 3 shows the relationship between BOD concentration and relative viscosity.
The figure shows the relationship between BOD concentration and BOD sludge load. In the figure, 1 is the first stage treatment tank, 2 is the second stage treatment tank, 3 is the settling tank, 4 is the waste water pipe, 5 is the treated water pipe, 6
7 indicates a sludge pipe, and 7 indicates a diffuser pipe.
【表】【table】
【表】【table】
Claims (1)
に際し、第１段として、1000ppm以下の低汚泥濃
度、１Kg／Kg−ss／日（ss：浮遊物質）以上の高
BOD汚泥負荷の条件下で粘質性のバルキングを
起こしたばつ気槽で、廃水中の溶解性汚濁物質を
汚泥に転化したのち、第２段において残存する未
分解の汚濁物質および第１段で増殖した汚泥を後
生動物および原生動物に富む活性汚泥で処理し、
最終的にバルキングを防止すると同時に余剰汚泥
量を減少させることを特徴とする有機汚濁廃水の
２段式微生物処理法。1. In the continuous treatment of organic polluted wastewater using aerobic microorganisms, the first step is to treat sludge with a low concentration of 1000 ppm or less and a high concentration of 1Kg/Kg-ss/day (ss: suspended solids) or more.
After converting the soluble pollutants in the wastewater into sludge in the aeration tank where viscous bulking occurred under BOD sludge loading conditions, the remaining undecomposed pollutants in the second stage and the remaining undecomposed pollutants in the first stage are The grown sludge is treated with activated sludge rich in metazoa and protozoa,
A two-stage microbial treatment method for organically contaminated wastewater, which is characterized by ultimately preventing bulking and at the same time reducing the amount of excess sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60141269A JPS621496A (en) | 1985-06-26 | 1985-06-26 | Two-stage microbiological treatment of organic dirty waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60141269A JPS621496A (en) | 1985-06-26 | 1985-06-26 | Two-stage microbiological treatment of organic dirty waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS621496A JPS621496A (en) | 1987-01-07 |
| JPS6351075B2 true JPS6351075B2 (en) | 1988-10-12 |
Family
ID=15287963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60141269A Granted JPS621496A (en) | 1985-06-26 | 1985-06-26 | Two-stage microbiological treatment of organic dirty waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS621496A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4501496B2 (en) * | 2004-03-30 | 2010-07-14 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
| KR101162474B1 (en) * | 2004-02-02 | 2012-07-03 | 쿠리타 고교 가부시키가이샤 | Process for biological treatment of organic waste water and apparatus therefor |
| US7754081B2 (en) * | 2004-07-16 | 2010-07-13 | Kuraray Co., Ltd. | Method of wastewater treatment with excess sludge withdrawal reduced |
| JP4492268B2 (en) * | 2004-09-16 | 2010-06-30 | 栗田工業株式会社 | Biological treatment equipment |
| JP4892917B2 (en) * | 2005-10-12 | 2012-03-07 | 栗田工業株式会社 | Biological treatment method and apparatus for organic wastewater |
| WO2007088860A1 (en) * | 2006-02-03 | 2007-08-09 | Kurita Water Industries Ltd. | Method of biologically treating organic waste water |
| CN103408142B (en) * | 2013-08-18 | 2014-08-13 | 北京工业大学 | Method for rapidly solving sticky sludge bulking problem |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229535A (en) * | 1975-09-02 | 1977-03-05 | Ibbott Jack Kenneth | Feeding mechanism of additional air to airrfuel mixed flow in internal combustion engine |
| JPS5422025A (en) * | 1977-07-15 | 1979-02-19 | Bosch Gmbh Robert | Regulator of number of revolution of fuel injection pump |
| JPS5541832A (en) * | 1978-09-20 | 1980-03-24 | Hitachi Ltd | Liquid drop injection device |
-
1985
- 1985-06-26 JP JP60141269A patent/JPS621496A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229535A (en) * | 1975-09-02 | 1977-03-05 | Ibbott Jack Kenneth | Feeding mechanism of additional air to airrfuel mixed flow in internal combustion engine |
| JPS5422025A (en) * | 1977-07-15 | 1979-02-19 | Bosch Gmbh Robert | Regulator of number of revolution of fuel injection pump |
| JPS5541832A (en) * | 1978-09-20 | 1980-03-24 | Hitachi Ltd | Liquid drop injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS621496A (en) | 1987-01-07 |
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