JPS63218296A - Process for preventing activated sludge from bulking - Google Patents
Process for preventing activated sludge from bulkingInfo
- Publication number
- JPS63218296A JPS63218296A JP62049396A JP4939687A JPS63218296A JP S63218296 A JPS63218296 A JP S63218296A JP 62049396 A JP62049396 A JP 62049396A JP 4939687 A JP4939687 A JP 4939687A JP S63218296 A JPS63218296 A JP S63218296A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- activated sludge
- bulking
- water
- type
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 125000005265 dialkylamine group Chemical group 0.000 claims abstract description 23
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 241000894006 Bacteria Species 0.000 claims description 61
- 230000001603 reducing effect Effects 0.000 abstract 1
- 229920003169 water-soluble polymer Polymers 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 52
- 238000005273 aeration Methods 0.000 description 33
- 239000007864 aqueous solution Substances 0.000 description 24
- 238000004062 sedimentation Methods 0.000 description 24
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 20
- 239000000203 mixture Substances 0.000 description 14
- 230000003247 decreasing effect Effects 0.000 description 13
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 12
- 239000010865 sewage Substances 0.000 description 11
- 229920000642 polymer Polymers 0.000 description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 9
- 229910052801 chlorine Inorganic materials 0.000 description 9
- 239000000460 chlorine Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 125000002091 cationic group Chemical group 0.000 description 5
- 230000029087 digestion Effects 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 239000005708 Sodium hypochlorite Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 4
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- 238000006297 dehydration reaction Methods 0.000 description 4
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- 239000003814 drug Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 4
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- 150000002367 halogens Chemical class 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 241000228212 Aspergillus Species 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- QCOGKXLOEWLIDC-UHFFFAOYSA-N N-methylbutylamine Chemical compound CCCCNC QCOGKXLOEWLIDC-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000010840 domestic wastewater Substances 0.000 description 2
- LIWAQLJGPBVORC-UHFFFAOYSA-N ethylmethylamine Chemical compound CCNC LIWAQLJGPBVORC-UHFFFAOYSA-N 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- GVWISOJSERXQBM-UHFFFAOYSA-N n-methylpropan-1-amine Chemical compound CCCNC GVWISOJSERXQBM-UHFFFAOYSA-N 0.000 description 2
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- 238000004065 wastewater treatment Methods 0.000 description 2
- LTHNHFOGQMKPOV-UHFFFAOYSA-N 2-ethylhexan-1-amine Chemical compound CCCCC(CC)CN LTHNHFOGQMKPOV-UHFFFAOYSA-N 0.000 description 1
- 241000190909 Beggiatoa Species 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 1
- AGPKZVBTJJNPAG-WHFBIAKZSA-N L-isoleucine Chemical compound CC[C@H](C)[C@H](N)C(O)=O AGPKZVBTJJNPAG-WHFBIAKZSA-N 0.000 description 1
- ROHFNLRQFUQHCH-YFKPBYRVSA-N L-leucine Chemical compound CC(C)C[C@H](N)C(O)=O ROHFNLRQFUQHCH-YFKPBYRVSA-N 0.000 description 1
- COLNVLDHVKWLRT-QMMMGPOBSA-N L-phenylalanine Chemical compound OC(=O)[C@@H](N)CC1=CC=CC=C1 COLNVLDHVKWLRT-QMMMGPOBSA-N 0.000 description 1
- OUYCCCASQSFEME-QMMMGPOBSA-N L-tyrosine Chemical compound OC(=O)[C@@H](N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-QMMMGPOBSA-N 0.000 description 1
- KZSNJWFQEVHDMF-BYPYZUCNSA-N L-valine Chemical compound CC(C)[C@H](N)C(O)=O KZSNJWFQEVHDMF-BYPYZUCNSA-N 0.000 description 1
- ROHFNLRQFUQHCH-UHFFFAOYSA-N Leucine Natural products CC(C)CC(N)C(O)=O ROHFNLRQFUQHCH-UHFFFAOYSA-N 0.000 description 1
- 241000736262 Microbiota Species 0.000 description 1
- 241000409991 Mythimna separata Species 0.000 description 1
- 208000012868 Overgrowth Diseases 0.000 description 1
- 241000228143 Penicillium Species 0.000 description 1
- 241000190807 Thiothrix Species 0.000 description 1
- KZSNJWFQEVHDMF-UHFFFAOYSA-N Valine Natural products CC(C)C(N)C(O)=O KZSNJWFQEVHDMF-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229940024606 amino acid Drugs 0.000 description 1
- 235000001014 amino acid Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000004067 bulking agent Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 150000004659 dithiocarbamates Chemical class 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000020595 eating behavior Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- -1 halogen ion Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002497 iodine compounds Chemical class 0.000 description 1
- 229960000310 isoleucine Drugs 0.000 description 1
- AGPKZVBTJJNPAG-UHFFFAOYSA-N isoleucine Natural products CCC(C)C(N)C(O)=O AGPKZVBTJJNPAG-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- QHCCDDQKNUYGNC-UHFFFAOYSA-N n-ethylbutan-1-amine Chemical compound CCCCNCC QHCCDDQKNUYGNC-UHFFFAOYSA-N 0.000 description 1
- XCVNDBIXFPGMIW-UHFFFAOYSA-N n-ethylpropan-1-amine Chemical compound CCCNCC XCVNDBIXFPGMIW-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 235000003715 nutritional status Nutrition 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 230000002588 toxic effect Effects 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- 239000004474 valine Substances 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)
Abstract
Description
【発明の詳細な説明】
〔発明の背景〕
技術分野
本発明は、活性汚泥の膨化現象、すなわちバルキング(
bulking ) 、を防止する方法に関する。[Detailed Description of the Invention] [Background of the Invention] Technical Field The present invention relates to the expansion phenomenon of activated sludge, that is, bulking (
Bulking).
さらに具体的には、本発明は、薬剤添加によるバルキン
グ防止法において、特定の雑菌によって発生する活性汚
泥のバルキングを効果的に防止する方法に関する。More specifically, the present invention relates to a method for effectively preventing bulking of activated sludge caused by specific bacteria in a method for preventing bulking by adding chemicals.
廃水処理に用いられる生物学的方法の一つとして活性汚
泥法がある。この方法は、有機物を含む廃水に空気を吹
込んで、微生物を繁殖させることによって生じる泥状物
、すなわち活性汚泥、の性質を利用したものであって、
活性汚泥が吸着性に富むフロックを生じて、その比重が
水のそれより大きい(たとえば1.003前後といわれ
ている)ところから、それが静置によって沈降してあと
に透明な処理水が残る、という現象を利用したものであ
る。沈降した活性汚泥は、返送汚泥として再使用される
。Activated sludge method is one of the biological methods used for wastewater treatment. This method utilizes the properties of activated sludge, a sludge produced by blowing air into wastewater containing organic matter and propagating microorganisms.
Activated sludge produces highly adsorbent flocs whose specific gravity is higher than that of water (for example, it is said to be around 1.003), which settles when left to stand, leaving behind clear treated water. This method takes advantage of the phenomenon of . The settled activated sludge is reused as return sludge.
下水、凍原および各種有機性産業廃水は、普通活性汚泥
法によって処理される。この方法によって処理している
間に、流入廃水の流量の変動、流入廃水中の有機物の食
動や下水道管内に生育した種々のカビ、糸状性細菌類等
の微生物の種類の変動ががおこって、これらの変動に応
じて活性汚泥中の微生物相も変化することが知られてい
る。この糸状性細菌が増加したときは、汚泥が膨化し、
沈降が悪くなり、汚泥が水面近くまで上昇し、汚泥の溢
流量がふえ、処理能力低下して場合によっては処理不能
となるいわゆるバルキング現象が発生する。この現象が
生ずると、汚泥は白っぽく、非常に軽く、沈降しにくい
ものとなり、BOD除去率も極端に低下する。Sewage, frozen ground and various organic industrial wastewaters are usually treated by activated sludge methods. During treatment using this method, fluctuations in the flow rate of inflowing wastewater, changes in the eating behavior of organic matter in inflowing wastewater, and changes in the types of microorganisms such as various molds and filamentous bacteria that grow in sewer pipes occur. It is known that the microbial flora in activated sludge changes in response to these changes. When this filamentous bacteria increases, the sludge expands and
Sedimentation worsens, sludge rises close to the water surface, the amount of sludge overflow increases, and a so-called bulking phenomenon occurs, which reduces treatment capacity and, in some cases, makes treatment impossible. When this phenomenon occurs, the sludge becomes whitish, very light, and difficult to settle, and the BOD removal rate is also extremely reduced.
活性汚泥が正常に機能しているか否かの一つの目安とし
て、S V I (Sludge Volume I
ndex s汚泥指標)値がある。このSVIは、1g
の活性汚泥が30分間の沈降により占める容積で表わさ
れる。正常な機能を発揮する活性汚泥のSVI値は50
〜150、特に100以下であるが、バルキングを起し
た活性汚泥のそれは、300〜800にもなることがあ
る。As an indicator of whether activated sludge is functioning normally, SVI (Sludge Volume I)
ndex s sludge index) value. This SVI is 1g
It is expressed as the volume occupied by activated sludge in 30 minutes of settling. The SVI value of activated sludge that functions normally is 50.
-150, especially below 100, but that of activated sludge that has undergone bulking can reach as high as 300-800.
このようなバルキングを起した活性汚泥は、その機能を
回復するのは容易でなく、最悪の場合には汚泥の入れ替
えの必要が生じ、工場などでは入れ替えの場合は汚泥の
馴養がすむまで使用を中止しなければならず、工場の生
産計画に重大な影響をLpえることとなる。公共下水処
理場でも、膨化汚泥の流出や汚泥濃度の低下により、B
ODの除去能率が低下して環境汚染につながり、大きな
社会問題となる場合がある。It is not easy to restore the function of activated sludge that has undergone such bulking, and in the worst case, it may be necessary to replace the sludge.In factories, when replacing the sludge, it is recommended that the sludge is not used until the sludge has become acclimatized. This would have to be canceled, which would have a serious impact on the factory's production plan. Even at public sewage treatment plants, B
The OD removal efficiency decreases, leading to environmental pollution, which may become a major social problem.
先行技術
活性汚泥のバルキング発生を防止する方法としては、特
公昭58−14274号公報、特公昭58−14275
号公報等に記載の方法が提案されている。Prior art methods for preventing bulking of activated sludge are disclosed in Japanese Patent Publications No. 58-14274 and Japanese Patent Publication No. 58-14275.
The method described in the above publication has been proposed.
特公昭58−14274号公報に記載の方法は、特定の
構造を育するジチオカルバミン酸塩の1種または2種以
上を、水に溶解して活性汚泥に添加する方法である。し
かしこの方法は、バルキングの原因が糸状菌類の異常繁
殖にある場合のみを対象としており、そのほかに原因が
ある場合には有効ではない。また、この方法によるとき
は、効果が発現されるまでには、活性汚泥の障害の程度
が比較的軽微であっても、4日以上、場合によっては1
0日以1−必要であり、しかも毎日子はに添加し続けな
ければならないという欠点がある。The method described in Japanese Patent Publication No. Sho 58-14274 is a method in which one or more dithiocarbamates that foster a specific structure are dissolved in water and added to activated sludge. However, this method is only applicable when the cause of bulking is abnormal growth of filamentous fungi, and is not effective when there are other causes. In addition, when using this method, it takes more than 4 days, or even 1 day in some cases, even if the degree of damage to the activated sludge is relatively minor, before the effect appears.
It has the disadvantage that it is necessary for 1 day after day 0 and must be continued to be added every day.
特公昭58−14275号公報に記載の方法は、廃水中
に、バリン、ロイシン、イソロイシン、グルタミン酸、
フェニルアラニン、チロシン等のアミノ酸の11または
2種以上を有効成分として含んでいる組成物を、活性汚
泥に添加するものである。この方法によるときは、これ
らの有効成分を含んでいる組成物を、流入廃水に対して
0.5〜3kg/Trtもの多量のレベルで、3時間以
上継続的に添加する必要があり、効果を発揮するまでに
は24時間以上の時間が必要であるとの欠点がある。The method described in Japanese Patent Publication No. 58-14275 contains valine, leucine, isoleucine, glutamic acid,
A composition containing 11 or 2 or more types of amino acids such as phenylalanine and tyrosine as active ingredients is added to activated sludge. When using this method, it is necessary to continuously add a composition containing these active ingredients to the inflowing wastewater at a high level of 0.5 to 3 kg/Trt for more than 3 hours, and the effect cannot be obtained. The drawback is that it takes more than 24 hours to show its full potential.
活性汚泥のバルキング現象は、5phacrot11u
s(スフエロチルス属) 、Th1othr1x (
チオトリックス属) 、Aspcrgillus (
アスペルギルス属)、Pcnlelllium (ペ
ニシリウムr14)等の糸状菌の異常繁殖にもとづくほ
か、季節や栄養状態によっては活性汚泥中に粘性に富む
ゼリー状の物質が発生し、これが原因で汚泥が沈降しに
くくなり、バルキング現象を示すこともある。後者の場
合には、廃水に対して、Z n C12や、陽イオン性
ポリアクリルアミド系高分子凝集剤を添加するのが効果
的であるといわれている。しかし本発明者の実験によれ
ば、この方法は、曝気槽等において、活性汚泥は気泡を
包含しやすく、気泡を包含した活性汚泥は、廃水を処理
する能力が極端に低下し、バルキング発生防止に顕著な
効果はないことが分った。The bulking phenomenon of activated sludge is 5phacrot11u
s (Sphaerochilus spp.), Th1othr1x (
Thiothrix), Aspcrgillus (
In addition to abnormal growth of filamentous fungi such as Aspergillus (genus Aspergillus) and Pcnlellium (Penicillium r14), a highly viscous jelly-like substance is generated in activated sludge depending on the season and nutritional status, which makes it difficult for the sludge to settle. , may also exhibit bulking phenomenon. In the latter case, it is said to be effective to add Z n C12 or a cationic polyacrylamide-based polymer flocculant to the wastewater. However, according to experiments conducted by the present inventors, this method has shown that activated sludge tends to contain air bubbles in an aeration tank, etc., and that activated sludge that contains air bubbles has an extremely reduced ability to treat wastewater, preventing bulking from occurring. It was found that there was no significant effect.
また、薬剤の添加に頼らず、例えば嫌気好気処理や、初
沈槽を用いず、多量の浮塀固形物(SS)を混入する方
法等の運転条件だけで正常な微生物相に復帰させる試み
がなされているが、タイプ0041糸状性細菌の異常発
生によるバルキングに対しては、いまだ満足なものは提
案されていない。In addition, attempts have been made to restore normal microbiota without relying on the addition of chemicals, using only operating conditions such as anaerobic and aerobic treatment, or adding a large amount of floating solids (SS) without using an initial settling tank. However, no satisfactory method has yet been proposed for bulking caused by abnormal growth of type 0041 filamentous bacteria.
考えられる解決策
しかして、タイプ0041糸状性細菌の異常繁殖による
バルキングに対しては、薬剤添加が有効である。Possible Solutions However, the addition of drugs is effective against bulking due to overgrowth of type 0041 filamentous bacteria.
このような薬剤添加による従来のバルキング防止法に認
められた問題点を解決するものとして、本発明者らは既
に一つの提案をなした(特開昭61−204092号公
報および特願昭60−295890号明細書)。これら
の提案は、バルキング防止用薬剤としてジアルキルアミ
ンとエビロクロルヒドリンとの反応によって得られる水
溶性陽イオン性重合体、あるいはジアルキルアミンとア
ンモニアとエピクロルヒドリンとの反応によって得られ
る水溶性陽イオン性重合体、を使用することを主要な特
徴とするものである。The present inventors have already made a proposal to solve the problems observed in the conventional bulking prevention method by adding chemicals (Japanese Patent Laid-Open No. 61-204092 and Japanese Patent Application No. 1983-1982). 295890). These proposals are based on the use of water-soluble cationic polymers obtained by the reaction of dialkylamines and epichlorohydrin, or water-soluble cationic polymers obtained by the reaction of dialkylamines, ammonia, and epichlorohydrin as anti-bulking agents. The main feature is the use of merging.
問題の所在
都市下水を対象とする一般の終末処理場では、糸状性細
菌に起因して発生するバルキングが最も多く、従来から
スフエロチルスやベギアトア(1’3eggiatoa
)がその原因微生物の代表であるとされている(下水
道協会誌、第22巻、第252号、第2〜12頁(19
85年))。Where the problem lies At general final treatment plants for urban sewage, bulking is most commonly caused by filamentous bacteria, and conventionally bulking caused by filamentous bacteria such as Sphaerochilus and Beggiatoa (1'3 eggiatoa
) are said to be representative of the causative microorganisms (Journal of the Japan Sewage Works Association, Vol. 22, No. 252, pp. 2-12 (19
1985)).
ところで、最近の下水道の整備に伴なって雨水と生活廃
水等とを分離して処理するようになってきた。その結果
、生活廃水等である都市下水の活性汚泥法による処理の
場合にバルキングを起す糸状性細菌にも変化が生じてい
ると推定される。By the way, with the recent development of sewerage systems, rainwater and domestic wastewater have come to be separated and treated. As a result, it is presumed that changes have occurred in the filamentous bacteria that cause bulking when urban sewage, such as domestic wastewater, is treated by the activated sludge method.
要旨
本発明は最近の都市下水の変化に対応して特定のバルキ
ング生成糸状性細菌を特定的に殺滅することを目的とし
、前記の本発明者らの水溶性陽イオン東合体をバルキン
グ防止用薬剤として使用することによってこの目的を達
成しようとするものである。Summary The present invention aims to specifically kill specific bulking-forming filamentous bacteria in response to recent changes in urban sewage. The aim is to achieve this goal by using it as a drug.
すなわち、本発明による活性汚泥のバルキング防出法は
、タイプ0041の糸状性細菌によってバルキングが生
じるべきまたは生じた活性汚泥あるいはそれを含をする
廃水に、この活性汚泥の乾燥固形分100重量部に対し
て0.05〜25ffl量部の、ジアルキルアミンと場
合によりアンモニア(ジアルキルアミンと等モル以下)
とエピハロヒドリンとの反応によって得られる水溶性陽
イオン性重合体を添加すること、を特徴とするものであ
る。That is, the method for preventing bulking of activated sludge according to the present invention is to add 100 parts by weight of dry solids of activated sludge to activated sludge or wastewater containing bulking that should or has been caused by filamentous bacteria of type 0041. 0.05 to 25 ffl parts of dialkylamine and optionally ammonia (equal mole or less to dialkylamine)
It is characterized by the addition of a water-soluble cationic polymer obtained by the reaction of 100% and epihalohydrin.
効果
本発明によれば、前記の目的が達成されて、タイプ00
41の糸状性細菌による活性汚泥のバルキングが特定的
に防止される。Effects According to the present invention, the above objects are achieved and the type 00
Bulking of activated sludge caused by 41 filamentous bacteria is specifically prevented.
すなわち、本発明による重合体によれば、糸状性細菌の
異常繁殖でSVI値が」−昇する徴候が認められた時点
で、またはSVI値がL昇したあとで、この重合体を添
加すると、速かにSVI値のさらなる上昇が実質的に生
じることなくSVI値をもとのレベルまたはそれ以下に
保持することができる。そのうえ、本発明薬剤によれば
、糸状性細菌の糸状形態が破壊され、生成物は処理水と
ともに処理槽から流出するけれどもBODの上昇はほと
んど認められないので、良好な処理水を提供することか
ができる。また、本発明薬剤は、1回の添加による効果
の持続時間が長い。That is, according to the polymer of the present invention, when this polymer is added at the time when signs of an increase in the SVI value due to abnormal proliferation of filamentous bacteria are observed, or after the SVI value has increased by L, The SVI value can quickly be maintained at or below the original level without substantial further increase in the SVI value. Moreover, according to the agent of the present invention, although the filamentous forms of filamentous bacteria are destroyed and the products flow out of the treatment tank together with the treated water, almost no increase in BOD is observed, so it is possible to provide good treated water. Can be done. Furthermore, the drug of the present invention has a long duration of effect after one addition.
従って、本発明を実施すれば、活性汚泥性工程管理」二
極めて有益である。Therefore, implementing the present invention will be extremely beneficial in terms of activated sludge process control.
なお、本発明は、このような固有の効果に加えて、本発
明者らの前記先行発明由来の下記の効果をも有する。In addition to these unique effects, the present invention also has the following effects derived from the prior invention of the present inventors.
(1)本発明方法によるときは、活性汚泥処理系に、l
itに水溶性陽イオン性重合体を添加するだけで、短時
間のうちに、活性汚泥のSVIの上昇を抑制することが
できる。(1) When using the method of the present invention, l is added to the activated sludge treatment system.
By simply adding a water-soluble cationic polymer to it, the increase in SVI of activated sludge can be suppressed in a short period of time.
(2)本発明方法によるときは、Ill気槽内の活性汚
泥の膨化はおこらず、沈降体積を小さくし、活性汚泥濃
度を高く保ち、BODの除去効果を著しく高くすること
ができる。(2) When the method of the present invention is used, the activated sludge in the Ill air tank does not expand, the sedimentation volume can be reduced, the activated sludge concentration can be kept high, and the BOD removal effect can be significantly increased.
(3)本発明方法によるときは、沈降槽においても活性
汚泥の沈降分離が極めて容易になる。しかも、沈降した
ものの体積(沈降体積)を著しく小さくできるため、余
剰活性汚泥が生成しにくく、余剰活性汚泥の除去、焼却
処理を頻繁に行なう必要がない。(3) When the method of the present invention is used, the sedimentation and separation of activated sludge becomes extremely easy even in a sedimentation tank. Moreover, since the volume of sedimented material (sedimentation volume) can be significantly reduced, excess activated sludge is less likely to be produced, and there is no need to frequently remove or incinerate excess activated sludge.
前記のように、本発明は特定の糸状性細菌による活性汚
泥のバルキングを防止する方法に関するものである。As mentioned above, the present invention relates to a method for preventing bulking of activated sludge due to certain filamentous bacteria.
対架活性汚泥
本発明が対象とする活性汚泥は、タイプ0041の糸状
性細菌によってバルキングを生じるものである。Activated sludge vs. activated sludge The activated sludge to which the present invention is directed is one that causes bulking due to type 0041 filamentous bacteria.
タイプ0041の糸状性細菌は、0.1+。Type 0041 filamentous bacteria is 0.1+.
Eikclboom+Prog、vatar Tcch
、、第8巻、第6号、第153−161頁(1977年
)に定義されているものである。Eikclboom+Prog, vatar Tcch
, Vol. 8, No. 6, pp. 153-161 (1977).
この糸状性細菌を含む都市下水活性汚泥が最近多くなっ
てきたことは前記したところであり、この微生物を単離
する必要があるならば、これらの下水の活性汚泥から容
易にこれを得ることができる。As mentioned above, urban sewage activated sludge containing this filamentous bacteria has recently become more common, and if it is necessary to isolate this microorganism, it can be easily obtained from these sewage activated sludges. .
水溶性陽イオン重合体
本発明で使用する薬剤は、その化学的本体がジアルキル
アミンとエピハロヒドリンとあるいはジアルキルアミン
とその等モル以下のアンモニアとエピハロヒドリンとの
反応によって得られたものである水溶性陽イオン性重合
体である。Water-soluble cationic polymer The drug used in the present invention is a water-soluble cation whose chemical substance is obtained by the reaction of a dialkylamine and epihalohydrin, or a dialkylamine and an equimolar amount or less of ammonia and epihalohydrin. Polymer.
この重合体の化学構造は必ずしも明らかではないが、ジ
アルキルアミンの窒素原子が四級化されていて、エピハ
ロヒドリン由来のハロゲンイオンがその対イオンをなし
ている構造が推定される(ただし、本発明はそのような
推定によって何らの馴約をも受けるものではない)。Although the chemical structure of this polymer is not necessarily clear, it is assumed that the nitrogen atom of the dialkylamine is quaternized and the halogen ion derived from epihalohydrin serves as its counter ion (however, the present invention No such presumption shall be construed as binding.)
また、本発明でいう「ジアルキルアミンと場合によりア
ンモニア(ジアルキルアミンと等モル以下)とエピハロ
ヒドリンとの反応によって得られる水溶性陽イオン性重
合体」は、上記の対イオン(ハロゲン)を他の陰イオン
に置きかえたものおよび対応水酸化物を包含するものと
する。Furthermore, in the present invention, the "water-soluble cationic polymer obtained by the reaction of a dialkylamine, optionally ammonia (equal molar or less to the dialkylamine), and epihalohydrin" is a water-soluble cationic polymer obtained by reacting an epihalohydrin with the above counterion (halogen). It is intended to include substitutes for ions and the corresponding hydroxides.
従って、アンモニアを含まない場合のこの水溶性陽イオ
ン重合体について考えられる推定構造は、下記の通りで
ある。Therefore, the possible predicted structure of this water-soluble cationic polymer when it does not contain ammonia is as follows.
R20H
ここで、R1−R2はジアルキルアミン由来のアルキル
基、X−はエピハロヒドリン由来のハロゲンその他の陰
イオンまたはOH″″、nは重合体であって、2以上、
好ましくは3以上)
このような重合体を製造すべきジアルキルアミンとして
は、アルキル基の炭素数が1〜8程度、特に1〜2程度
のもの、が好ましい。2個のアルキル基は、−分子中で
同一でなくてもよい。このようなジアルキルアミンの具
体例としては、ジメチルアミン、ジエチルアミン、ジプ
ロピルアミン、メチルエチルアミン、メチルプロピルア
ミン、エチルプロピルアミン、メチルブチルアミン、エ
チルブチルアミン、ジブチルアミン、2−エチルヘキシ
ルアミン等があげられる。R20H Here, R1-R2 is an alkyl group derived from dialkylamine, X- is a halogen or other anion derived from epihalohydrin or OH'', n is a polymer, and 2 or more,
(preferably 3 or more) The dialkylamine from which such a polymer is to be produced is preferably one in which the alkyl group has about 1 to 8 carbon atoms, particularly about 1 to 2 carbon atoms. The two alkyl groups do not have to be the same in the molecule. Specific examples of such dialkylamine include dimethylamine, diethylamine, dipropylamine, methylethylamine, methylpropylamine, ethylpropylamine, methylbutylamine, ethylbutylamine, dibutylamine, 2-ethylhexylamine, and the like.
アンモニアを併用するときは、ジアルキルアミンに対し
てごくわずか添加すればよい。その量は、モル比で、ア
ンモニア/ジアルキルアミン−〇、0001〜1.0の
範囲で選ぶことができ、特に好ましいのはモル比で0.
001〜0.1の範囲である。When ammonia is used in combination, it is only necessary to add a very small amount to the dialkylamine. The amount can be selected in the molar ratio of ammonia/dialkylamine-〇,0001 to 1.0, with a particularly preferred molar ratio of 0.0001 to 1.0.
It is in the range of 001 to 0.1.
エピハロヒドリンとしては、ハロゲンがフッ素、塩素、
臭素、またはヨウ素のものが一般に対象となるが、エピ
クロルヒドリンが少なくとも経済上の理由から好ましい
といえる。In epihalohydrin, the halogens are fluorine, chlorine,
Bromine or iodine compounds are generally targeted, but epichlorohydrin is preferred at least for economic reasons.
ジアルキルアミン、アンモニア(使用したとき)および
エピハロヒドリンを反応させるには、ジアルキルアミン
とアンモニアとのモル数と、エピハロヒドリンのモル数
とをほぼ等モルとし、撹拌機付き密閉型反応容器を用い
、不活性ガスの雰囲気下で、反応容器内温を30〜11
0℃の温度範囲とするのがよい。To react dialkylamine, ammonia (when used), and epihalohydrin, the number of moles of dialkylamine and ammonia is approximately equal to the number of moles of epihalohydrin, a closed reaction vessel equipped with a stirrer is used, and an inert Under a gas atmosphere, the internal temperature of the reaction vessel is set to 30-11
The temperature range is preferably 0°C.
より具体的には、ジアルキルアミンまたはこれと場合に
よりアンモニアとの20〜70重量%濃度の水溶液を、
撹拌機、還流冷却器、温度計等を備えた密閉型反応容器
に仕込み、容器内雰囲気を窒素ガスで置換し、撹拌下、
反応容器内温が上昇しすぎないように調節しながら、エ
ピハロヒドリンを連続的または回分式に添加するのがよ
い。アンモニアを加える場合には、先ず、ジメチルアミ
ン水溶液中にエピハロヒドリンを添加し、ついで、アン
モニアを添加するのがよい。反応容器にエピハロヒドリ
ンとジアルキルアミン(およびアンモニア)とを添加し
終えてから、反応容器に、アルカリ金属、アルカリ土類
金属の酸化物や水酸化物を、エピクロルヒドリン1モル
に対して0.00001〜0.01モル添加し、30〜
60°Cの温度範囲で数時間保持すると、生成した重合
体の分子量が上昇することがある。なお、この反応生成
物を、水溶液のまま、窒素ガス雰囲気下で、約30℃の
温度に保持すると、約2ケ月間程度は、緩慢に、分子量
が上昇する反応が進行する。この間、容器に空気または
酸素を入れると、分子量が上昇する反応は進行しなくな
る。More specifically, a 20-70% strength by weight aqueous solution of dialkylamine or dialkylamine and optionally ammonia,
Pour into a closed reaction container equipped with a stirrer, reflux condenser, thermometer, etc., replace the atmosphere inside the container with nitrogen gas, and while stirring,
It is preferable to add epihalohydrin continuously or batchwise while controlling the internal temperature of the reaction vessel to prevent it from rising too much. When adding ammonia, it is preferable to first add epihalohydrin to the dimethylamine aqueous solution and then add ammonia. After adding epihalohydrin and dialkylamine (and ammonia) to the reaction vessel, add alkali metal or alkaline earth metal oxides or hydroxides to the reaction vessel at a rate of 0.00001 to 0.00 per mole of epichlorohydrin. .01 mol added, 30~
Holding in the temperature range of 60°C for several hours may increase the molecular weight of the resulting polymer. Note that when this reaction product is maintained as an aqueous solution at a temperature of about 30° C. under a nitrogen gas atmosphere, a reaction in which the molecular weight increases slowly proceeds for about two months. During this time, if air or oxygen is introduced into the container, the reaction that increases the molecular weight will not proceed.
このようにして得られる重合体を更に処理して、対イオ
ンとしてのハロゲン(エピハロヒドリン由来のもの)を
他の陰イオンに代えることも、対イオンを除去してこの
陽イオン重合体を水酸化物にすることも、可能であるこ
とは前記したところから明らかである。The polymer thus obtained can be further processed to replace the halogen (derived from epihalohydrin) as a counterion with another anion or to remove the counterion and convert this cationic polymer into a hydroxide. It is clear from the above that it is also possible to do this.
」1記のようにして得られる重合体は、2モル/リット
ルのKBr水溶液に溶解して測定、算出する極限粘度[
η]によって、分子量の大小を判断することができて、
本発明方法では、[η]が0.0O1dl/g以上、よ
り好ましくは0.01dl/ g以上、のちのを使用す
る。[η]が過度に小さいと、活性汚泥への吸着性が低
下して、バルキング防止効果の持続性が低下するので好
ましくない。The polymer obtained as described in 1 above has an intrinsic viscosity [
η], the molecular weight can be determined by
In the method of the present invention, [η] is 0.001 dl/g or more, more preferably 0.01 dl/g or more. If [η] is too small, the adsorption to activated sludge will decrease and the sustainability of the bulking prevention effect will decrease, which is not preferable.
このようにして得られた水溶性陽イオン性重合体は溶媒
(水がふつうである)を除去して固体とすることもでき
る。しかし、水溶液として製造されたものはそのままあ
るいは必要に応じて希釈または濃縮して、水溶液として
活性汚泥のバルキング防11−に使用することが好まし
く、またそれがふつうである。The water-soluble cationic polymer thus obtained can also be converted into a solid by removing the solvent (usually water). However, it is preferable and usual that the aqueous solution produced as an aqueous solution is used as it is or after being diluted or concentrated if necessary, for use as an aqueous solution for bulking prevention of activated sludge.
活性汚泥のバルキング防上
バルキングを防止すべき対象活性汚泥が上記のような特
定の糸状性細菌を含をするものであること、ならびにそ
れによって生じることあるべき処理条件の変更を除けば
、本発明による薬剤添加による活性汚泥のバルキング防
止法は従来のそれと本質的には変らない。Prevention of Bulking of Activated Sludge The present invention is applicable to the present invention, except that the target activated sludge to be prevented from bulking contains specific filamentous bacteria as described above, and that the treatment conditions are changed accordingly. The method of preventing bulking of activated sludge by adding chemicals is essentially the same as the conventional method.
具体的には、水溶性陽イオン性重合体を適当濃度、たと
えば0. 1〜10重量%程度の濃度の水溶液としてお
き、この水溶液を下記のいずれかの方法またはこれらを
2種以上組合せた方法に従って添加すればよい。Specifically, the water-soluble cationic polymer is added to an appropriate concentration, for example 0. An aqueous solution having a concentration of about 1 to 10% by weight may be prepared, and this aqueous solution may be added according to any of the following methods or a combination of two or more of these methods.
(1)流入廃水に混和、混合し、これを曝気槽に送る方
法。(1) Method of mixing with inflowing wastewater and sending it to an aeration tank.
(2)曝気槽や沈降槽の活性汚泥のバルキングが起って
いる槽に、直接添加する方法。(2) Method of adding directly to an aeration tank or settling tank where bulking of activated sludge is occurring.
(3)返送汚泥に添加する方法。(3) Method of adding to returned sludge.
この水溶性陽イオン性重合体の使用量は、使用量が少な
すぎると、発明の目的が達成されないので好ましくなく
、逆に多すぎると、糸状性細菌が急激に破壊されて処理
水が急激に白濁したり、廃水とともに系外に流去されて
場合によっては処理水のCODの上昇をひきおこす可能
性があるので好ましくない。使用量は、活性汚0,05
〜25重量部の範囲で選ぶのがよい。より好ましくは、
0.1〜10Tf1量部の範囲である。If the amount of this water-soluble cationic polymer used is too small, the purpose of the invention will not be achieved, so it is undesirable. On the other hand, if it is too large, filamentous bacteria will be rapidly destroyed and the treated water will deteriorate rapidly. This is not preferable because it may become cloudy or be washed out of the system together with the wastewater, possibly causing an increase in the COD of the treated water. The amount used is activated dirt 0.05
It is preferable to choose between 25 parts by weight. More preferably,
The range is 0.1 to 10Tf1 part.
活性汚泥に対して、水溶性陽イオン性重合体を、泥の乾
燥固形分100重量部に対して、前記範囲で1回添加す
ると、1ケ月以上はSVI値の上昇は認められない。そ
の後は、SVI値が上昇する徴候が認められたら、その
時点で、水溶性陽イオン性重合体を、前記範囲で添加す
るのがよい。When a water-soluble cationic polymer is added to activated sludge once in the above range per 100 parts by weight of dry solid content of the mud, no increase in the SVI value is observed for one month or more. Thereafter, when signs of an increase in the SVI value are observed, the water-soluble cationic polymer is preferably added within the above range.
実験例
実施例1
月8七均2500 rIt/日、BODが280ppm
。Experimental Example Example 1 Monthly 87yen 2500 rIt/day, BOD 280ppm
.
浮遊固形分(S S)が220ppmあり、しかもその
88分の成分は有機質分が50%以上を占め、また、1
日の流入原水の時間変化が非常に大きくて午前9時と午
後10時に処理量が最低時の約6倍になる状態が周期的
に毎日繰り返されている集合住宅団地からの下水排水量
が大部分を占める分流式都市下水道排水を、1000m
の曝気槽と500mの最終沈降槽を用いて、活性汚泥に
よる廃水処理している公共下水処理場で、曝気槽の沈降
汚泥体積指数(SVI値)が350を超え、返送汚泥の
乾燥汚泥濃度(MLSS)が3000ppm以下になり
、曝気槽内のMLSSも1200ppm以下になり、最
終沈澱槽で処理水と汚泥の分離性が著しく悪化し、処理
水が白濁し、最終沈降槽からの処理水のBOD値が20
ppmを超えた。運転条件は、返送汚泥の処理原水に対
する返送率は5G%、原水に対する空気倍率は8倍、空
気の導入は散気板を使用している。この処理場の曝気槽
=lfliびに沈降槽の汚泥をダラム染色して位相差顕
微鏡で観察したところ、汚泥のなかと周辺部には、フロ
ック形成菌に付着した、典型的なタイプ0041の糸状
性細菌が多く観察された。The suspended solid content (S S) is 220 ppm, and moreover, organic matter accounts for 50% or more of the 88 components, and 1
Most of the sewage discharge comes from apartment complexes, where the daily inflow raw water has a very large temporal change, and the amount of treated water at 9 a.m. and 10 p.m. is approximately six times the lowest at 9 a.m. and 10 p.m. Separate urban sewerage drainage, which occupies 1,000m of
At a public sewage treatment plant where wastewater is treated with activated sludge using an aeration tank and a 500m final settling tank, the settled sludge volume index (SVI value) of the aeration tank exceeds 350, and the dry sludge concentration ( MLSS) becomes less than 3000 ppm, MLSS in the aeration tank also becomes less than 1200 ppm, the separation of treated water and sludge in the final settling tank deteriorates significantly, the treated water becomes cloudy, and the BOD of the treated water from the final settling tank decreases. value is 20
Exceeded ppm. The operating conditions are that the return ratio of returned sludge to treated raw water is 5G%, the air ratio to raw water is 8 times, and a diffuser plate is used to introduce air. When the sludge in the aeration tank and settling tank at this treatment plant was Durham stained and observed using a phase contrast microscope, it was found that the sludge contained typical type 0041 filaments attached to floc-forming bacteria in and around the sludge. Many bacteria were observed.
この処理場で、エピクロルヒドリンと50%ジメチルア
ミン水溶液のモル比が1:1.05の割合になる迄、5
096ジメチルアミン水溶液の中にエピクロルヒドリン
を反応温度を90℃に保ちながら添加、攪はん混合して
得られた混合反応組成物(2モル/リットルのKBr水
溶液で測定した極限粘度〔η〕が0.02dl/、の組
成物)を70g/分の割合でこれを100倍に水道水で
希釈しながら返送汚泥ラインに50時間連続添加したと
ころ、9時間後から最終沈降槽からの処理水中にタイプ
0041等の糸状性細菌の破壊されたと考えられるもの
が多数観察されると共に、曝気槽中にあるタイプ004
1等が破壊され始めてSVI値が150に低下し、最終
沈降槽の汚泥界面位置も低下してきた。50時間後には
、SVI値が90になった。この時の曝気槽中に存在す
る汚泥にはタイプ0041等の糸状性細菌が極端に減少
したことが、確認できた。また、活性汚泥は、添加前に
比べて、しっかりしたフロックを形成して来た。その結
果、100時間後には、沈降性が著しく改善されてSV
I値が80になり、それに伴い、返送汚泥濃度がMLS
S値5500ppmに上昇し、曝気槽の汚泥濃度もML
SS値2300ppmに上昇してきたので、原水の処理
が平常の運転で良好な処理水が得られるように成り、従
って原水の流入量が朝と晩に大きく変動しても、返送汚
泥の濃度が高く成った為、返送率を一時的に調節するだ
けで、曝気槽の汚泥濃度を変えられ、しかも、沈降槽の
汚泥界面が上昇して流出するドが無くなった。At this treatment plant, until the molar ratio of epichlorohydrin and 50% dimethylamine aqueous solution becomes 1:1.05,
096 A mixed reaction composition obtained by adding epichlorohydrin to a dimethylamine aqueous solution while maintaining the reaction temperature at 90°C and mixing with stirring (intrinsic viscosity [η] measured with a 2 mol/liter KBr aqueous solution is 0) A composition of 0.02 dl/min) was continuously added to the return sludge line for 50 hours while diluting it 100 times with tap water at a rate of 70 g/min. A large number of destroyed filamentous bacteria such as 0041 were observed, as well as type 004 in the aeration tank.
As the first class began to be destroyed, the SVI value decreased to 150, and the position of the sludge interface in the final settling tank also decreased. After 50 hours, the SVI value was 90. It was confirmed that filamentous bacteria such as type 0041 were extremely reduced in the sludge present in the aeration tank at this time. Furthermore, the activated sludge formed firmer flocs than before addition. As a result, after 100 hours, the sedimentation properties were significantly improved and the SV
The I value becomes 80, and the returned sludge concentration decreases to MLS.
The S value has increased to 5500 ppm, and the sludge concentration in the aeration tank has also decreased to ML.
Since the SS value has increased to 2,300 ppm, it is now possible to obtain good quality treated water during normal operation, and therefore even if the amount of raw water inflow varies greatly between morning and evening, the concentration of returned sludge remains high. As a result, the sludge concentration in the aeration tank can be changed simply by temporarily adjusting the return rate, and the sludge interface in the settling tank rises, eliminating the possibility of outflow.
タイプ0041等の糸状性細菌が破壊されて流出して来
るが、この時の浮遊固形分濃度は5ppm未満であり、
塩素滅閑後の放流水のBODおよびCODの値は、それ
ぞれ20ppm未満であって、放流水として良好な状態
であった。Filamentous bacteria such as type 0041 are destroyed and flow out, but the suspended solids concentration at this time is less than 5 ppm,
The BOD and COD values of the effluent after chlorination were each less than 20 ppm, and were in good condition as effluent.
実施例2
実施例1の処理場で、タイプ0041等の糸状性細菌が
多量に発生して、SVI値が250を超えた。返送汚泥
の乾燥汚泥濃度(MLSS)が3500ppm以下にな
り、曝気槽内のMLSSも1200ppm以下になり、
最終沈澱槽で処理水と汚泥の分離性が著しく悪化し、処
理水が白濁し、最終沈降槽からの処理水のBOD値が2
0ppmを超えた。運転条件は、返送汚泥の処理原水に
対する返送率は50%、原水に対する空気倍率は8倍、
空気の導入は散気板を使用している。Example 2 In the treatment plant of Example 1, a large amount of filamentous bacteria such as type 0041 occurred, and the SVI value exceeded 250. The dry sludge concentration (MLSS) of the returned sludge is 3500 ppm or less, and the MLSS in the aeration tank is also 1200 ppm or less.
Separability of treated water and sludge in the final sedimentation tank deteriorated significantly, the treated water became cloudy, and the BOD value of the treated water from the final sedimentation tank decreased to 2.
Exceeded 0 ppm. The operating conditions are that the return ratio of return sludge to treated raw water is 50%, the air ratio to raw water is 8 times,
A diffuser plate is used to introduce air.
この処理場の曝気槽並びに沈降槽の汚泥をダラム染色し
て位を日差顕微鏡で観察したところ、汚泥ののなかと周
辺部には、フロック形成菌に付着した、典型的なタイプ
0041の糸状性細菌が多く観察された。When the sludge in the aeration tank and sedimentation tank of this treatment plant was Duram-stained and observed under a daylight microscope, it was found that in the sludge and around the sludge, typical type 0041 filaments attached to floc-forming bacteria were observed. Many sexually transmitted bacteria were observed.
この処理場で、エピクロルヒドリンと50%ジメチルア
ミン水溶液のモル比が1=1の割合になる迄、50%ジ
メチルアミン水溶液の中にエピクロルヒドリンを反応温
度を85℃に保ちながら添加、攪はん混合して得られた
混合反応組成物(2モル/リットルのKBr水溶液で測
定した極限粘度〔η〕が0.12dl/g−の組成物)
を70g/分の割合でこれを100倍に水道水で希釈し
ながら返送汚泥ラインに45時間連続添加したところ、
8時間後から最終沈降槽からの処理水中にタイプ004
1等の糸状性細菌が破壊されたと考えられるものが多数
観察されると共に、曝気槽中にあるタイプ0041等の
糸状性細菌が破壊され始め、SVI値が160に低下し
、最終沈降槽の汚泥界面位置も低下してきた。50時間
後には、SVI値が90になった。この時の曝気槽中に
存(1:する汚泥には糸状性細菌が極端に減少したこと
が、確認できた。70時間後にはタイプ0041等の糸
状性細菌の糸状形態が破壊され、しかも、破壊された糸
状細菌が処理水と一緒に流出して、曝気槽と沈降槽内に
残存している活性汚泥には、殆どタイプ0041等の糸
状性細菌が残っていないのが確認できた。また、活性汚
泥は、添加前に比べて、しっかりしたフロックを形成し
て来た。At this treatment plant, epichlorohydrin was added to a 50% dimethylamine aqueous solution while maintaining the reaction temperature at 85°C, and the mixture was stirred until the molar ratio of epichlorohydrin and 50% dimethylamine aqueous solution was 1=1. The mixed reaction composition obtained by
was continuously added to the return sludge line for 45 hours at a rate of 70 g/min while diluting it 100 times with tap water.
After 8 hours, type 004 was added to the treated water from the final settling tank.
Many filamentous bacteria of type 0041 in the aeration tank were observed to be destroyed, and the SVI value decreased to 160, causing the sludge in the final settling tank to decrease. The interface position has also decreased. After 50 hours, the SVI value was 90. It was confirmed that the filamentous bacteria present in the aeration tank at this time (1: It was confirmed that the destroyed filamentous bacteria flowed out together with the treated water, and that almost no filamentous bacteria such as type 0041 remained in the activated sludge remaining in the aeration tank and sedimentation tank. , activated sludge formed firmer flocs than before addition.
その結果、活性汚泥の沈降性が著しく改善され、SVI
値が80になり、返送汚泥濃度がMLSS値7000p
pmに上昇し、曝気槽の汚泥濃度もMLSS値2600
ppmに」−Hしてきた。更に、重力式の濃縮槽で汚泥
が濃縮され、消化槽に濃厚な汚泥が送れるようになり、
消化ガスの発生速度が、に昇して、消化槽の効率が上昇
した。また、消化汚泥の脱水時にカチオン系ポリアクリ
ルアミドを凝集剤として、汚泥の乾燥TiI!:iに対
して0.6ffiE1%使用して遠心式デカンタ−で脱
水していたが、凝集剤の使用量が0.5重量%で脱水出
来るようになった。As a result, the sedimentation properties of activated sludge were significantly improved, and SVI
The value becomes 80, and the returned sludge concentration reaches the MLSS value of 7000p.
pm and the sludge concentration in the aeration tank also reached an MLSS value of 2600.
ppm”-H. Furthermore, the sludge is thickened in a gravity-type thickening tank, and the thick sludge can be sent to the digestion tank.
The rate of production of digester gas increased to , and the efficiency of the digester increased. In addition, when dewatering digested sludge, cationic polyacrylamide is used as a flocculant to dry sludge TiI! Dehydration was performed using a centrifugal decanter using 0.6ffiE1% for :i, but now dehydration can be performed using 0.5% by weight of flocculant.
タイプ0041等の糸状性細菌が破壊されて流出して来
るが、この時の浮遊固形分濃度は5ppm未満であり、
塩素滅菌後の放流水のBODおよびCODの値は、それ
ぞれ20ppm未満であって、放流水として良好な状態
であった。Filamentous bacteria such as type 0041 are destroyed and flow out, but the suspended solids concentration at this time is less than 5 ppm,
The BOD and COD values of the effluent after chlorine sterilization were each less than 20 ppm, and were in good condition as effluent.
水溶性陽イオン性正合体添加後、約1ケ月間は、ド水道
の排水中にはタイプ0041等の糸状性細E■が含冑さ
れていると考えられるにも拘らず、糸状菌の急激な増加
が抑制されていた。For about a month after the addition of the water-soluble cationic conjugate, although it is thought that the drainage water from the water supply system contains filamentous cells such as type 0041, the growth of filamentous bacteria rapidly increases. This increase was suppressed.
実施例3
実施例1の処理場で、タイプ0041等の糸状性細菌が
多量に発生して、SVI値が250を超えた。返送汚泥
の乾燥汚泥濃度(MLSS)が3500ppm以下にな
り、曝気槽内のMLSSも1200ppm以下になり、
最終沈澱槽で処理水と汚泥の分離性が著しく悪化し、処
理水が白濁し、最終沈降槽からの処理水のBOD値が2
0ppmを超えた。運転条件は、返送汚泥の処理原水に
対する返送率は50%、原水に対する空気倍率は8倍、
空気の導入は散気板を使用している。Example 3 In the treatment plant of Example 1, a large amount of filamentous bacteria such as type 0041 occurred, and the SVI value exceeded 250. The dry sludge concentration (MLSS) of the returned sludge is 3500 ppm or less, and the MLSS in the aeration tank is also 1200 ppm or less.
Separability of treated water and sludge in the final sedimentation tank deteriorated significantly, the treated water became cloudy, and the BOD value of the treated water from the final sedimentation tank decreased to 2.
Exceeded 0 ppm. The operating conditions are that the return ratio of return sludge to treated raw water is 50%, the air ratio to raw water is 8 times,
A diffuser plate is used to introduce air.
この処理場の曝気槽並びに沈降槽の汚泥をダラム染色し
て位相差顕微鏡で観察したところ、汚泥ののなかと周辺
部には、フロック形成菌に付着した、典型的なタイプ0
041の糸状性細菌が多く観察された。When the sludge in the aeration tank and sedimentation tank at this treatment plant was stained with Durham and observed using a phase contrast microscope, it was found that the inside and surrounding area of the sludge contained typical type 0 bacteria attached to floc-forming bacteria.
Many filamentous bacteria of 041 were observed.
この処理場で、エピクロルヒドリンと50%ジメチルア
ミン水溶液と1296アンモニア水溶液のモル比が1:
1.o5:o、1の割合になる迄、50%ジメチルアミ
ン水溶液と1296アンモニア水の中の混合アミン中に
、エピクロルヒドリンを反応温度を90℃に保ちながら
添加、攪はん混合して得られた混合反応組成物を更に、
100時間後ん混合して得られた反応組成物(2モル/
リットルのKBr水溶液で測定した極限粘度〔η〕が0
.02dl/gの組成物)を70g/分の割合でこれを
100倍に水道水で希釈しながら返送汚泥ラインに50
時間連続添加したところ、8時間後から最終沈降槽から
の処理水中にタイプ0041糸状性細菌の破壊されたと
考えられるものが多数観察されると共に、曝気槽中にあ
るタイプ0041糸状性細菌が破壊され始めてSVI値
が】30に低下し、最終沈降槽の汚泥界面位置も低下し
てきた。50時間後には、SVI値が80になった。こ
の時の曝気槽中に存在する汚泥にはタイプ0041の糸
状性細菌が極端に減少したことが、確認できた。また、
活性汚泥は、添加前に比べて、しっかりしたフロックを
形成して来た。In this treatment plant, the molar ratio of epichlorohydrin, 50% dimethylamine aqueous solution, and 1296 ammonia aqueous solution is 1:
1. A mixture obtained by adding epichlorohydrin to a mixed amine in a 50% dimethylamine aqueous solution and 1296 ammonia water while maintaining the reaction temperature at 90°C until the ratio of o5:o, 1 is reached, and stirring and mixing. The reaction composition further comprises:
The reaction composition obtained by mixing after 100 hours (2 mol/
The intrinsic viscosity [η] measured with liter of KBr aqueous solution is 0.
.. 0.2 dl/g composition) was added to the return sludge line at a rate of 70 g/min while diluting it 100 times with tap water.
After 8 hours of continuous addition, many types of type 0041 filamentous bacteria that were thought to have been destroyed were observed in the treated water from the final settling tank, and type 0041 filamentous bacteria in the aeration tank were also destroyed. For the first time, the SVI value decreased to ]30, and the position of the sludge interface in the final settling tank also decreased. After 50 hours, the SVI value was 80. It was confirmed that the number of type 0041 filamentous bacteria in the sludge present in the aeration tank at this time was extremely reduced. Also,
The activated sludge formed a firmer floc than before addition.
その結果、100時間後には、沈降性が著しく改善され
て、SVI値が70になった。返送汚泥濃度がMLSS
値6500ppmに上昇し、曝気槽の汚泥濃度もMLS
S値2400ppmに上昇してきたので、原水の処理が
平常の運転で良好な処理水が得られるように成った。ま
た、原水の流入量が朝と晩に大きく変動しても、返送汚
泥の濃度が高く成った為、返送率を一時的に調節するだ
けで、曝気槽の汚泥濃度が変えられ、しかも、沈降槽の
汚泥界面が−1−昇して流出する事が無くなった。As a result, after 100 hours, the sedimentation properties were significantly improved and the SVI value reached 70. Returned sludge concentration is MLSS
The value rose to 6,500 ppm, and the sludge concentration in the aeration tank also reached MLS.
Since the S value has increased to 2,400 ppm, it has become possible to obtain good quality treated water with normal operation. In addition, even if the amount of raw water flowing in changes greatly between morning and evening, the concentration of the returned sludge becomes high, so by temporarily adjusting the return rate, the sludge concentration in the aeration tank can be changed, and the sedimentation The sludge interface in the tank no longer rises by -1- and flows out.
更に、重力式の濃縮槽で汚泥が濃縮され、消化槽に濃厚
な汚泥が送れるようになり、消化ガスの発生速度が上昇
して、消化槽の効率が上昇した。In addition, the sludge was thickened in a gravity-type thickening tank, which made it possible to send thick sludge to the digester, increasing the rate of digestion gas generation and increasing the efficiency of the digester.
タイプ0041等の糸状性細菌が破壊されて流出して来
るが、この時の浮遊固形分濃度は5ppm未満であり、
塩素滅菌後の放流水のBODおよびCODの値は、それ
ぞれ20ppm未満であって、放流水として良好な状態
であった。Filamentous bacteria such as type 0041 are destroyed and flow out, but the suspended solids concentration at this time is less than 5 ppm,
The BOD and COD values of the effluent after chlorine sterilization were each less than 20 ppm, and were in good condition as effluent.
実施例4
実施例1の処理場で、タイプ0041等の糸状性細菌が
多量に発生して、SVI値が250を超えた。返送汚泥
の乾燥汚泥濃度(MLSS)が3500ppm以下にな
り、曝気槽内のMLSSも1200ppm以下になり、
最終沈澱槽で処理水と汚泥の分離性が著しく悪化し、処
理水が白濁し、最終沈降槽からの処理水のBOD値が2
0ppmを超えた。運転条件は、返送汚泥の処理原水に
対する返送率は5096、原水に対する空気倍率は8倍
、空気の導入は散気板を使用している。Example 4 In the treatment plant of Example 1, a large amount of filamentous bacteria such as type 0041 occurred, and the SVI value exceeded 250. The dry sludge concentration (MLSS) of the returned sludge is 3500 ppm or less, and the MLSS in the aeration tank is also 1200 ppm or less.
Separability of treated water and sludge in the final sedimentation tank deteriorated significantly, the treated water became cloudy, and the BOD value of the treated water from the final sedimentation tank decreased to 2.
Exceeded 0 ppm. The operating conditions are that the return ratio of returned sludge to treated raw water is 5096, the air ratio to raw water is 8 times, and a diffuser plate is used to introduce air.
この処理場の曝気槽並びに沈降槽の汚泥をダラム染色し
て位相差顕微鏡で観察したところ、汚泥のフロックのな
かと周辺部には、フロックに付着した、典型的なタイプ
0041の糸状性細菌が多く観察された。When the sludge in the aeration tank and sedimentation tank at this treatment plant was Durham stained and observed using a phase contrast microscope, it was found that typical type 0041 filamentous bacteria attached to the sludge flocs were found in and around the sludge flocs. observed a lot.
二の処理場で、エピクロルヒドリンと50%ジメチルア
ミン水溶液と12%アンモニア水溶液のモル比が1;1
:0.1の割合になる迄、50%ジメチルアミン水溶液
の中に、エピクロルヒドリンを反応温度を90℃に保ち
なから添加、攪はん混合して得られた混合反応組成物に
、更に攪はんしながら12%アンモニア水を添加して、
100時間後ん混合して得られた反応組成物(2モル/
リットルのKBr水溶液でM1定した極限粘度〔η〕が
0.12dl/gの組成物)を70g/分の割合でこれ
を100倍に水道水で希釈しながら返送汚泥ラインに5
0時間連続添加したところ、8時間後から最終沈降槽か
らの処理水中にタイプ0041の糸状性細菌の破壊され
たと考えられるものが多数観察されると共に、曝気槽中
にあるタイプ0041の糸状性細菌が破壊され始−めて
SVI値が160に低下し、最終沈降槽の汚泥界面位置
も低下してきた。50時間後には、SVI値が100に
なった。この時の曝気槽中に存在する汚泥には糸状性細
菌が極端に減少したことが、確認できた。70時間後に
はタイプ0041の糸状性細菌の糸状形態が破壊され、
しかも、破壊された糸状細菌が処理水と一緒に流出して
、曝気槽と沈降槽内に残存している活性汚泥には、殆ど
タイプ0041の糸状性細菌が残っていないのが確認で
きた。また、活性汚泥は、添加前に比べて、しっかりし
たフロックを形成して来た。その結果、活性汚泥の沈降
性が著しく改善されてSVI値が80になり、返送汚泥
濃度がMLSS値7000ppmに上昇し、曝気槽の汚
泥濃度もMLSS値2800ppmに上昇してきた。更
に、重力式の濃縮槽で汚泥が濃縮され易くなり、嫌気消
化槽に濃厚な汚泥が送れるようになり、消化槽でのガス
の発生速度が増大し、消化槽の効率が上昇した。At the second treatment plant, the molar ratio of epichlorohydrin, 50% dimethylamine aqueous solution, and 12% ammonia aqueous solution was 1:1.
: Add epichlorohydrin to a 50% dimethylamine aqueous solution while keeping the reaction temperature at 90°C until the ratio is 0.1, and stir and mix to the resulting mixed reaction composition, without further stirring. While stirring, add 12% ammonia water,
The reaction composition obtained by mixing after 100 hours (2 mol/
A composition with an intrinsic viscosity [η] of 0.12 dl/g determined by M1 with 1 liter of KBr aqueous solution was added to the return sludge line at a rate of 70 g/min while diluting it 100 times with tap water.
When the addition was continued for 0 hours, a large number of destroyed type 0041 filamentous bacteria were observed in the treated water from the final settling tank after 8 hours, and type 0041 filamentous bacteria in the aeration tank were observed. began to be destroyed, and the SVI value decreased to 160, and the position of the sludge interface in the final settling tank also decreased. After 50 hours, the SVI value reached 100. It was confirmed that the number of filamentous bacteria in the sludge present in the aeration tank at this time was extremely reduced. After 70 hours, the filamentous form of type 0041 bacteria was destroyed;
Furthermore, it was confirmed that the destroyed filamentous bacteria flowed out together with the treated water, and that almost no type 0041 filamentous bacteria remained in the activated sludge remaining in the aeration tank and sedimentation tank. Furthermore, the activated sludge formed firmer flocs than before addition. As a result, the sedimentation properties of the activated sludge were significantly improved and the SVI value reached 80, the return sludge concentration increased to an MLSS value of 7000 ppm, and the sludge concentration in the aeration tank also increased to an MLSS value of 2800 ppm. Furthermore, it became easier to thicken the sludge in the gravity-type thickening tank, making it possible to send thick sludge to the anaerobic digestion tank, increasing the rate of gas generation in the digestion tank, and increasing the efficiency of the digestion tank.
また、消化汚泥の脱水時にカチオン系ポリアクリルアミ
ドを汚泥の乾燥重量に対して0. 6重量%凝集剤とし
て添加後、遠心式デカンタ−で脱水していたが、この凝
集剤の使用量を0.5重量%迄減らしても脱水出来るよ
うになった。In addition, when dewatering digested sludge, cationic polyacrylamide was added at 0.0% relative to the dry weight of the sludge. After adding 6% by weight of flocculant, dehydration was performed in a centrifugal decanter, but now dehydration can be achieved even if the amount of flocculant used is reduced to 0.5% by weight.
タイプ0041の糸状性細菌が破壊されて流出して来る
が、この時の浮遊固形分濃度は5ppm未満であり、塩
素滅菌後の放流水のBODおよびCODの値は、それぞ
れ20ppm未満であって、放流水として良好な状態で
あった。Type 0041 filamentous bacteria are destroyed and flow out, but the suspended solids concentration at this time is less than 5 ppm, and the BOD and COD values of the effluent after chlorine sterilization are each less than 20 ppm, The water was in good condition as effluent.
水溶性陽イオン性重合体添加後、約1ケ月間は、下水道
の排水中にはタイプ0041の糸状性細菌がa&されて
いると考えられるにも拘らず、これらの糸状性細菌の急
激な増加が抑制されていた。For about one month after the addition of the water-soluble cationic polymer, there was a rapid increase in the number of type 0041 filamentous bacteria, even though it is thought that there were type 0041 filamentous bacteria in the sewage wastewater. was suppressed.
比較例1
実施例1において、タイプ0041の糸状性細菌が多量
に発生して、SVI値が350を超えた。Comparative Example 1 In Example 1, a large amount of filamentous bacteria of type 0041 occurred, and the SVI value exceeded 350.
返送16泥の乾燥汚泥濃度(MLSS)が3500pp
m以−ドになり、曝気槽内のMLSSも1200ppm
以下になり、最終沈澱槽で処理水と汚泥の分離性が著し
く悪化し、処理水が白濁し、最終沈降槽からの処理水の
BOD値が20ppmを超えた。返送汚泥ラインに次亜
塩素酸ナトリウム水溶液(a効塩素濃度5%)を50リ
ットル/日の割合で5日181添加したところ、汚泥中
に自存されていた糸状性細菌が減少し始めたが、SVI
値は]80であって沈降しに<<、十分でないので、更
に次亜塩素酸ナトリウム水溶液(育効塩素濃度596)
を80リットル/口の割合で5日間添加したところ、S
VI値は90と低下して来たが、処理水が著しく白濁し
、浮遊固形分濃度が15ppmを超えた。塩素滅菌後の
放流水のBODは20ppm未満であったが、CODの
値は30ppmを超えた。顕微鏡で活性汚泥の状態を観
察したところ、フロックが破壊されて非常に微細に成り
、原生動物が全くいなくなった。白濁したのは、liに
タイプ0041の糸状性細菌が破壊されて流出したのみ
ならず、有用なフロック形成菌の多くが破壊されて、フ
ロック形成能力を失い、微細な状態になり流出したこと
による。この白濁状態は、返送汚泥ラインに次亜塩素酸
ナトリウム水溶液(有効塩素濃度5%)を添加している
最中は勿論、添加を終了した後、30間は続き、破壊さ
れた有用なフロック形成菌等が流出しているのが観察さ
れた。そのため、放流水は、白濁した状態が続き、良好
な状態とは言いがたかった。また、添加を終了してから
、処理水が白濁状態から開放されると直ちに再度タイプ
0041等の糸状性細菌が観察されるように成った。そ
して、8日後には、SVI値は150になった。Dry sludge concentration (MLSS) of returned 16 mud is 3500pp
MLSS in the aeration tank is also 1200ppm.
The separability of treated water and sludge in the final settling tank deteriorated significantly, the treated water became cloudy, and the BOD value of the treated water from the final settling tank exceeded 20 ppm. When an aqueous sodium hypochlorite solution (5% effective chlorine concentration) was added to the return sludge line at a rate of 50 liters/day for 5 days, the filamentous bacteria existing in the sludge began to decrease. , SVI
The value is 80, which is not sufficient for sedimentation, so add a sodium hypochlorite aqueous solution (cultivating chlorine concentration 596).
When added for 5 days at a rate of 80 liters/mouth, S
Although the VI value decreased to 90, the treated water became extremely cloudy and the suspended solids concentration exceeded 15 ppm. The BOD of the effluent after chlorine sterilization was less than 20 ppm, but the COD value exceeded 30 ppm. When the state of the activated sludge was observed under a microscope, the flocs were destroyed and became extremely fine, with no protozoa present at all. The white cloudiness was due to the fact that not only type 0041 filamentous bacteria were destroyed by li and leaked out, but also many of the useful floc-forming bacteria were destroyed, losing their floc-forming ability, becoming microscopic, and leaking out. . This cloudy state lasts not only while adding sodium hypochlorite aqueous solution (effective chlorine concentration: 5%) to the return sludge line, but also for 30 minutes after the addition is completed, and the formation of useful flocs that has been destroyed. Bacteria were observed to be leaking out. As a result, the discharged water remained cloudy and was not in good condition. Further, after the addition was completed, as soon as the treated water was released from its cloudy state, filamentous bacteria such as type 0041 were observed again. After 8 days, the SVI value reached 150.
次亜塩素酸ナトリウム水溶液(有効塩素濃度596)は
毒性が強いので、添加に際しては充分な設備と注意をし
なければならない。更に、機器の腐食をも促進するので
、添加場所に制約がある。Since sodium hypochlorite aqueous solution (effective chlorine concentration 596) is highly toxic, sufficient equipment and care must be taken when adding it. Furthermore, since it also promotes corrosion of equipment, there are restrictions on where it can be added.
比較例2
実施例1において、タイプ0041の糸状性細菌が多;
に発生して、SVI値が250を超えた。Comparative Example 2 In Example 1, there were many filamentous bacteria of type 0041;
The SVI value exceeded 250.
返送汚泥の乾燥汚泥濃度(MLSS)が3500ppm
以ドになり、曝気槽内のMLSSも1200ppm以下
になり、最終沈澱槽で処理水と汚泥の分離性が著しく悪
化し、処理水が白濁し、最終沈降槽からの処理水のBO
D値が20ppmを超えた。カチオン系ポリアクリルア
ミド(ダイヤフロック株式会社製のC402)を曝気槽
から最終沈降槽への流出汚泥に対して、3ppmの割合
で、8日間添加したところ、タイプ0041の糸状性細
菌を含んだ状態で凝集が生じてSVI値が120になっ
た。しかし、添加をやめた後は徐々に沈降性が悪化して
、80後にはSVI値が180に上昇した。Dry sludge concentration (MLSS) of returned sludge is 3500 ppm
As a result, the MLSS in the aeration tank became less than 1200 ppm, the separation of treated water and sludge in the final settling tank deteriorated significantly, the treated water became cloudy, and the BO of the treated water from the final settling tank deteriorated.
D value exceeded 20 ppm. When cationic polyacrylamide (C402 manufactured by Diafloc Co., Ltd.) was added at a rate of 3 ppm for 8 days to the sludge flowing from the aeration tank to the final settling tank, it was found that it contained type 0041 filamentous bacteria. Aggregation occurred resulting in an SVI value of 120. However, after the addition was stopped, the sedimentation properties gradually worsened, and the SVI value increased to 180 after 80 minutes.
そこで再度、この凝集剤を添加して、沈降性を促進した
。そして、この添加を繰り返していたら、曝気槽と沈降
槽において、汚泥が気泡を抱き込んでメゾ上し、最終沈
降槽から汚泥が処理水と共に流出して、排水処理に支障
が表れた。Therefore, this flocculant was added again to promote sedimentation. When this addition was repeated, the sludge entrained air bubbles in the aeration tank and settling tank and rose to the top, and the sludge flowed out of the final settling tank together with the treated water, causing problems in wastewater treatment.
Claims (1)
るべきまたは生じた活性汚泥あるいはそれを含有する廃
水に、この活性汚泥の乾燥固形分100重量部に対して
0.05〜25重量部の、ジアルキルアミンと場合によ
りアンモニア(ジアルキルアミンと等モル以下)とエピ
ハロヒドリンとの反応によって得られる水溶性陽イオン
性重合体を添加することを特徴とする、活性汚泥のバル
キング防止法。0.05 to 25 parts by weight of dialkylamine per 100 parts by weight of dry solids of the activated sludge is added to activated sludge or wastewater containing bulking which is to be or has been bulked by filamentous bacteria of type 0041. A method for preventing bulking of activated sludge, which is characterized by adding a water-soluble cationic polymer obtained by the reaction of ammonia (equal mole or less with dialkylamine) and epihalohydrin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62049396A JPS63218296A (en) | 1987-03-04 | 1987-03-04 | Process for preventing activated sludge from bulking |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62049396A JPS63218296A (en) | 1987-03-04 | 1987-03-04 | Process for preventing activated sludge from bulking |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63218296A true JPS63218296A (en) | 1988-09-12 |
Family
ID=12829872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62049396A Pending JPS63218296A (en) | 1987-03-04 | 1987-03-04 | Process for preventing activated sludge from bulking |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63218296A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990005117A1 (en) * | 1988-11-04 | 1990-05-17 | Mitsubishi Monsanto Chemical Company Limited | Treatment of activated sludge |
WO1990009966A1 (en) * | 1989-02-23 | 1990-09-07 | Mitsubishi Kasei Polytec Company | Treatment of activated sludge |
AT409857B (en) * | 2000-08-30 | 2002-12-27 | Vta Engineering Und Umwelttech | Suppressing scum formation during the aerobic stage of biological water purification involves adding a mixture of a flocculant based on a polymerized metal hydroxide compound and a positively-charged organic compound |
-
1987
- 1987-03-04 JP JP62049396A patent/JPS63218296A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990005117A1 (en) * | 1988-11-04 | 1990-05-17 | Mitsubishi Monsanto Chemical Company Limited | Treatment of activated sludge |
WO1990009966A1 (en) * | 1989-02-23 | 1990-09-07 | Mitsubishi Kasei Polytec Company | Treatment of activated sludge |
AT409857B (en) * | 2000-08-30 | 2002-12-27 | Vta Engineering Und Umwelttech | Suppressing scum formation during the aerobic stage of biological water purification involves adding a mixture of a flocculant based on a polymerized metal hydroxide compound and a positively-charged organic compound |
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