JP7339671B2 - sewage treatment system - Google Patents
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- JP7339671B2 JP7339671B2 JP2020204644A JP2020204644A JP7339671B2 JP 7339671 B2 JP7339671 B2 JP 7339671B2 JP 2020204644 A JP2020204644 A JP 2020204644A JP 2020204644 A JP2020204644 A JP 2020204644A JP 7339671 B2 JP7339671 B2 JP 7339671B2
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- 239000010865 sewage Substances 0.000 title claims description 77
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 52
- 239000001301 oxygen Substances 0.000 claims description 52
- 229910052760 oxygen Inorganic materials 0.000 claims description 52
- 230000000813 microbial effect Effects 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000004062 sedimentation Methods 0.000 claims description 38
- 244000005700 microbiome Species 0.000 claims description 37
- 239000010802 sludge Substances 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 28
- 230000004913 activation Effects 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000035784 germination Effects 0.000 claims description 11
- 238000004659 sterilization and disinfection Methods 0.000 claims description 10
- 235000015097 nutrients Nutrition 0.000 claims description 9
- 241001156739 Actinobacteria <phylum> Species 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 241000192125 Firmicutes Species 0.000 claims description 5
- 241000192733 Chloroflexus Species 0.000 claims description 4
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 3
- 241000605059 Bacteroidetes Species 0.000 claims description 3
- 241000192142 Proteobacteria Species 0.000 claims description 3
- 238000010564 aerobic fermentation Methods 0.000 claims description 3
- 210000000936 intestine Anatomy 0.000 claims description 3
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 description 11
- 238000005273 aeration Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000008719 thickening Effects 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
- Treatment Of Sludge (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Sewage (AREA)
- Treatment Of Biological Wastes In General (AREA)
Description
本発明は、下水処理システムに関し、更に詳細には、家庭や工場・企業などから排出される下水のための中継ポンプ場と、最初沈殿池、生物処理槽および最終沈殿池を備え、下水道管渠を介して、前記中継ポンプ場からの下水を受け、これを処理する下水処理設備とを備えた下水処理システムに関する。 TECHNICAL FIELD The present invention relates to a sewage treatment system, and more specifically, it comprises a relay pumping station for sewage discharged from homes, factories, companies, etc., a primary sedimentation tank, a biological treatment tank and a final sedimentation tank, and sewage pipes. and a sewage treatment facility for receiving and treating sewage from the relay pumping station through the sewage treatment system.
排水や汚水等の被処理液を処理する方法として、活性汚泥により被処理液を処理する活性汚泥処理が広く行われている。
例えば、特開２０１３－２３３４８２号公報等に広く開示されているように、活性汚泥法を適用する廃水処理システムは、基本的には最初沈殿池（なお小規模下水処理システムでは省略する場合がある）と、反応槽と、最終沈殿池とから構成される。そして、活性汚泥法に従って、供給された廃水から最初沈殿池で生汚泥が分離された後、流路を通って供給された廃水に対して反応槽の中で曝気・エアレーションによって酸素を溶解させると同時に攪拌混合し、その中に主に好気性微生物からなる活性汚泥を浮遊滞留させた後、流路を通って供給された最終沈殿池で活性汚泥を沈殿させて、上澄みの水を放流水として流出させる。反応槽は、曝気槽、反応タンク、エアレーションタンク、生物処理槽などと呼ばれることもあり、曝気時間は６～１４時間である。最終沈殿池で沈殿した活性汚泥の一部は、返送汚泥として再び反応槽に戻されて、残りは余剰汚泥として機械濃縮設備で濃縮される。
Activated sludge treatment, in which the liquid to be treated is treated with activated sludge, is widely used as a method for treating liquid to be treated such as wastewater and sewage.
For example, as widely disclosed in Japanese Unexamined Patent Application Publication No. 2013-233482, etc., a wastewater treatment system that applies the activated sludge method is basically a primary sedimentation tank (which may be omitted in a small-scale sewage treatment system ), a reaction tank, and a final sedimentation tank. Then, according to the activated sludge method, after raw sludge is separated from the supplied wastewater in the primary sedimentation tank, oxygen is dissolved in the wastewater supplied through the flow channel by aeration and aeration in the reaction tank. After stirring and mixing at the same time, the activated sludge mainly composed of aerobic microorganisms is suspended and retained therein, and then the activated sludge is settled in the final sedimentation tank supplied through the channel, and the supernatant water is used as effluent water. let it flow. The reaction tank is sometimes called an aeration tank, reaction tank, aeration tank, biological treatment tank, etc., and the aeration time is 6-14 hours. A part of the activated sludge precipitated in the final sedimentation tank is returned to the reaction tank as return sludge, and the rest is thickened as excess sludge in a mechanical thickening facility.
以上のようにして、最終沈殿池で沈殿した活性汚泥の一部を有効利用しているが、これに留まるものである。 As described above, part of the activated sludge precipitated in the final sedimentation tank is effectively used, but this is the only way.
そこで本発明は、一歩進んで、活性汚泥を処理して、前記中継ポンプ場より下流側で更に有効に作用する微生物資材を製造する微生物資材製造装置を備えた下水処理システムを提供することを目的とする。 Accordingly, it is an object of the present invention to go a step further and provide a sewage treatment system equipped with a microbial material manufacturing apparatus that treats activated sludge and manufactures microbial materials that act more effectively downstream from the relay pumping station. and
上記課題は、下記構成の本発明の下水処理システムによって達成される。
すなわち、本発明の下水処理システムは、下水のための中継ポンプ場と、最初沈殿池、生物処理槽および最終沈殿池のうち少なくとも生物処理槽および最終沈殿池を備え、下水道管渠を介して、前記中継ポンプ場からの下水を受け、これを処理する下水処理設備とを備えた下水処理システムにおいて、
前記最初沈殿池および最終沈殿池のうち少なくとも最終沈殿池に接続され、最初沈殿池からの余剰汚泥および最終沈殿池からの返送汚泥のうち少なくとも最終沈殿池からの返送汚泥を受け、これを脱水するための脱水手段、
この脱水手段からの脱水汚泥を、温度を６０℃～１１０℃に保った状態で、酸素を供給して、前記脱水汚泥中のグラム陽性の好気性微生物により好気性発酵させ、これによりグラム陰性の嫌気性および通性嫌気性微生物を分解死滅させるとともに、この好気性発酵以降に生成された好気性微生物の芽胞を含有する微生物資材を製造する微生物資材製造装置、
後述する微生物活性化装置に、該下水処理システムの系のいずれかからの水を給送するための水給送手段、
後述する微生物活性化装置に、酸素を供給するための酸素供給手段、および
前記微生物資材製造装置からの微生物資材を受け、かつ前記酸素供給手段からの酸素、および前記水給送手段からの水の供給を受けると共に、この水の温度を１０℃～４０℃に、酸素濃度を１～１０ｍｇ／Ｌに維持して、前記微生物資材の前記芽胞を発芽させて、活性化させ、この活性化された微生物資材を前記中継ポンプ場に供給する微生物活性化装置を備え、
前記好気性微生物が、フィルミクテス門のグラム陽性のバシラス綱に属するもの、および／または放線菌門のグラム陽性のアクチノバクテリア綱に属するもの、および／またはクロロフレクサス門のグラム陽性菌を含む
ことを特徴とするものである。
前記微生物資材は、それに含まれる微生物のうち、放線菌門のグラム陽性のアクチノバクテリア綱に属するものが最も多い。前記微生物活性化装置へ供給する前記水が、前記下水処理設備により処理済みの水であることが好ましい。前記微生物活性化装置へ供給する前記水は、前記下水処理設備が、前記最終沈殿池からの水を消毒するための消毒槽を備えている場合、この消毒槽における消毒前の水であることが好ましい。
前記水給送手段からの水の温度は、１５℃～４０℃の範囲に維持される。また、前記水給送手段からの水は、前記芽胞の発芽に必要な栄養素を備えていることが好ましい。前記酸素供給手段からの酸素は、通常、空気の形態で供給される
前記嫌気性および通性嫌気性微生物としては、腸内に存在するプロテオバクテリア門のグラム陰性の硫酸塩還元菌を含むもの、および／またはバクテロイデス門のグラム陰性のものが挙げられる。
The above objects are achieved by a sewage treatment system of the present invention having the following configuration.
That is, the sewage treatment system of the present invention includes a relay pump station for sewage, and at least a biological treatment tank and a final sedimentation tank among a primary sedimentation tank, a biological treatment tank, and a final sedimentation tank, and through a sewage pipe, A sewage treatment system comprising a sewage treatment facility for receiving and treating sewage from the relay pumping station,
It is connected to at least the final sedimentation tank of the primary sedimentation tank and the final sedimentation tank, receives the excess sludge from the primary sedimentation tank and the return sludge from the final sedimentation tank, and dewaters the returned sludge from at least the final sedimentation tank. dehydration means for
The dehydrated sludge from this dehydration means is kept at a temperature of 60° C. to 110° C., oxygen is supplied, and the Gram-positive aerobic microorganisms in the dehydrated sludge aerobicly ferment, thereby causing Gram-negative A microbial material manufacturing apparatus that decomposes and kills anaerobic and facultative anaerobic microorganisms and manufactures a microbial material containing spores of aerobic microorganisms generated after this aerobic fermentation,
water feed means for feeding water from any of the systems of the sewage treatment system to the microbial activation device described later;
Oxygen supply means for supplying oxygen to the microbial activation device, which will be described later; While receiving the supply, the temperature of the water is maintained at 10° C. to 40° C. and the oxygen concentration is maintained at 1 to 10 mg/L to germinate and activate the spores of the microbial material, and the activated Equipped with a microbial activation device that supplies microbial materials to the relay pump station,
characterized in that said aerobic microorganisms include those belonging to the Gram-positive class Bacillus of the phylum Firmicutes and/or those belonging to the Gram-positive class Actinobacteria of the phylum Actinomycota and/or Gram-positive bacteria of the phylum Chloroflexus. and
Among the microorganisms contained in the microbial material, most of them belong to the class Gram-positive Actinobacteria of the phylum Actinomycota. It is preferable that the water supplied to the microorganism activation device is water that has been treated by the sewage treatment facility. When the sewage treatment facility is equipped with a disinfection tank for disinfecting the water from the final sedimentation tank, the water supplied to the microorganism activation device may be water before disinfection in the disinfection tank. preferable.
The temperature of the water from the water supply means is maintained in the range of 15°C to 40°C. Moreover, it is preferable that the water from the water supply means contains nutrients necessary for germination of the spores. The anaerobic and facultative anaerobic microorganisms, to which oxygen from the oxygen supply means is usually supplied in the form of air, include Gram-negative sulfate-reducing bacteria of the phylum Proteobacteria present in the intestine; and/or Gram-negative members of the phylum Bacteroidetes.
以上の構成により、本下水処理システムにおいては、中継ポンプ場より下流の下水管渠に、発芽した好気性微生物およびもともと下水中に存在していた好気性微生物の酸素の消費にかかわらず、下水中には、十分な酸素が溶存した状態（酸素濃度が増大した状態）となる。
下水の酸素濃度が増大した結果、嫌気性細菌である硫酸塩還元菌を失活化させ硫化水素の生成を抑制する結果として、硫酸生成菌の抑制により硫酸の生成の防止を行うとともに、好気性微生物により、中継ポンプ場直下からの下水管渠の壁面のバイオフィルム内細菌条件を良好な状態に改善させることができ、これによって、硫酸の発生を抑制し、下水管渠の腐食を防止し、長寿命化するとともに、前記好気性微生物の活動により下水自体の清浄化を図り、後の設備の負担を軽減することができる。
With the above configuration, in this sewage treatment system, regardless of the consumption of oxygen by germinated aerobic microorganisms and aerobic microorganisms originally present in the sewage, , a state in which sufficient oxygen is dissolved (a state in which the oxygen concentration is increased) is reached.
As a result of the increase in the oxygen concentration of sewage, anaerobic sulfate-reducing bacteria are deactivated and the production of hydrogen sulfide is suppressed. Microorganisms can improve the bacterial conditions in the biofilm on the wall surface of the sewer culvert from directly below the relay pump station to a favorable state, thereby suppressing the generation of sulfuric acid and preventing corrosion of the sewer culvert, In addition to prolonging the service life, the activity of the aerobic microorganisms purifies the sewage itself, thereby reducing the load on subsequent facilities.
以下、添付図面を参照しつつ本発明の実施の形態による下水処理システム１０について説明する。 A sewage treatment system 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
下水処理システム１０は、家庭や工場・企業などから排出される下水のための中継ポンプ場２０、および下水道管渠１００を介して、前記中継ポンプ場２０からの下水を受け、これを処理する下水処理設備５０を備えている。この下水処理設備５０は、通常の活性汚泥法によるものと同様、最初沈殿池５２、生物処理槽（曝気槽）５４、最終沈殿池５６および消毒槽５８を備えており、下水は、以上を経て、浄化され、消毒され、下水管渠を介して放流される。下水処理設備５０の上記した構成については、この種下水処理システム１０においては、通常のものであるので、これ以上の詳細は省略する。また、中継ポンプ場２０は、各家庭や工場等から延びる下水管渠に接続されたポンプＰを備えている。 A sewage treatment system 10 receives sewage from a relay pump station 20 for sewage discharged from homes, factories, companies, etc., and sewage from the relay pump station 20 via a sewer pipe 100, and treats it. A processing facility 50 is provided. This sewage treatment facility 50 is equipped with a primary sedimentation tank 52, a biological treatment tank (aeration tank) 54, a final sedimentation tank 56, and a disinfection tank 58, as in a normal activated sludge process. , are cleaned, disinfected and discharged through sewers. Since the above-described configuration of the sewage treatment facility 50 is conventional in this type of sewage treatment system 10, further details will be omitted. In addition, the relay pumping station 20 includes a pump P connected to a sewage pipe extending from each home, factory, or the like.
前記下水処理システム１０は、さらに前記最初沈殿池５２および最終沈殿池５６に接続され、最初沈殿池からの余剰汚泥および最終沈殿池からの返送汚泥を受け、これを脱水するための脱水装置を備えている。この脱水装置６０には、前記余剰汚泥および返送汚泥の一方のみを受け、これを脱水するようにしてもよい。この脱水装置６０としては、遠心分離型、フィルタープレス型や機械濃縮型等のいずれの形式の脱水方法を行うものであってもよく、この脱水装置６０によって、前記余剰汚泥および／または返送汚泥を含水率６５～８５％の脱水汚泥とする。 The sewage treatment system 10 is further connected to the primary sedimentation tank 52 and the final sedimentation tank 56, and includes a dehydrator for receiving surplus sludge from the primary sedimentation tank and return sludge from the final sedimentation tank and dewatering them. ing. The dehydrator 60 may receive only one of the excess sludge and the returned sludge and dewater it. The dehydrator 60 may be one that performs any type of dehydration method such as a centrifugal separation type, a filter press type, or a mechanical concentration type. Dehydrated sludge with a moisture content of 65-85%.
この脱水装置には、微生物資材製造装置６２が接続されている。この微生物資材製造装置６２は、前記脱水装置６０からの脱水汚泥を、温度を６０℃～１１０℃に保った状態で、酸素を供給して、前記脱水汚泥中のグラム陽性の好気性微生物により好気性発酵させる。この好気性発酵で費やした脱水汚泥中の水分および栄養分の枯渇により、グラム陰性の嫌気性微生物を分解死滅、あるいは少なくとも一部死滅をさせるとともに、好気性微生物が芽胞となることを利用して、有害なグラム陰性の嫌気性および通性嫌気性微生物を極力含まず、有益な好気性微生物の芽胞を高率（微生物資材中の微生物のうち、アクチノバクテリアが５０％強、フィルミクテスが２０％強、クロロフレクサス門が１０％強含まれる）で含有する微生物資材を製造する。この微生物資材製造装置６２は、上記の温度管理のため、ヒータを備えており、また必要により酸素（空気）供給装置を備える。この微生物資材製造装置６２により、比較的乾燥したサラサラの粒子上微生物資材が製造される。 A microbial material manufacturing device 62 is connected to this dehydrator. This microbial material manufacturing device 62 supplies oxygen to the dewatered sludge from the dewatering device 60 while maintaining the temperature at 60 ° C. to 110 ° C., so that the gram-positive aerobic microorganisms in the dehydrated sludge are more favorable. ferment aerially. Depletion of moisture and nutrients in the dehydrated sludge spent in this aerobic fermentation causes Gram-negative anaerobic microorganisms to be decomposed and killed, or at least partially killed, and aerobic microorganisms become spores, Harmful Gram-negative anaerobic and facultative anaerobic microorganisms are contained as little as possible, and a high percentage of beneficial aerobic microbial spores Chloroflexus phylum is included by more than 10%). This microbial material manufacturing apparatus 62 is equipped with a heater for the above-mentioned temperature control and, if necessary, an oxygen (air) supply device. This microbial material producing apparatus 62 produces a relatively dry and smooth particulate microbial material.
前記下水処理システム１０は、前記下水処理設備５０に設置され、あるいは接続された第１微生物活性化装置７０を備えている。この微生物活性化装置７０には、該下水処理システムの系のいずれかからの水を該微生物活性化装置７０に給送するための第１水給送手段７２が接続されている。この微生物活性化装置７０には、必要に応じて、および酸素を該微生物活性化装置７０に給送するための第１酸素供給手段７４が接続されている。前記水給送手段７２が供給する水としては、処理を受ける前の下水（例えば、前記中継ポンプ場２０のポンプＰより上流の下水）や、消毒槽５８前の最終沈殿池５６から流れ出る水であることが好ましい。これらの水は、前記芽胞を発芽させるために必要な栄養素を含有しており、芽胞の発芽に必要な水分と栄養素を同時に提供できる。
第１水給送手段７２からの水中の溶存酸素量が不足している場合には、第１酸素供給手段７４から酸素を供給する。この供給される酸素は、空気の形で供給されても良い。この場合、酸素発生装置や酸素タンクを特別に設ける必要はない
なお、従来技術（特開２００１－２７１５１０号公報参照）において、本発明の微生物資材にほぼ相当する発酵物（肥料のための）を下水汚泥に直接添加するものがあるが、その目的は、活性汚泥の沈殿の促進であり、その目的が本発明の目的とは異なっている。また、前記従来技術からは、当該発酵物を前記生物反応槽に直接添加することも考えられるが、前記生物反応槽には、栄養素を優先して消費する他の微生物（グラム陰性菌等）が多く存在し、芽胞の発芽のための栄養素等が枯渇し、あるいは少なくなっているため、生物反応槽に直接添加された芽胞は、発芽することなく、あるいは発芽に長時間を必要とする。したがって、有用微生物の下水処理の機能の発揮は限定的であると思われる。
The sewage treatment system 10 includes a first microbial activation device 70 installed in or connected to the sewage treatment facility 50 . Connected to the microbial activation device 70 is a first water feed means 72 for feeding water from any of the systems of the sewage treatment system to the microbial activation device 70 . Connected to the microbial activation device 70 is a first oxygen supply means 74 for supplying oxygen to the microbial activation device 70 as required. The water supplied by the water supply means 72 may be sewage before being treated (for example, sewage upstream from the pump P of the relay pumping station 20) or water flowing out from the final sedimentation tank 56 in front of the disinfection tank 58. Preferably. These waters contain nutrients necessary for germination of the spores, and can simultaneously provide moisture and nutrients necessary for germination of the spores.
When the amount of dissolved oxygen in water from the first water supply means 72 is insufficient, oxygen is supplied from the first oxygen supply means 74 . This supplied oxygen may be supplied in the form of air. In this case, it is not necessary to provide a special oxygen generator or oxygen tank. Some are added directly to sewage sludge, but their purpose is to promote the precipitation of activated sludge, which is different from the purpose of the present invention. Further, from the above prior art, it is conceivable to add the fermented product directly to the bioreactor, but the bioreactor contains other microorganisms (such as Gram-negative bacteria) that preferentially consume nutrients. The spores directly added to the bioreactor either do not germinate or require a long period of time for germination because they are abundant and the nutrients and the like for germination of the spores are depleted or reduced. Therefore, it is considered that the function of useful microorganisms in sewage treatment is limited.
前記第１微生物活性化装置７０は、前記微生物資材製造装置６２からの微生物資材を受け、該微生物資材に、前記水給送手段７２からの水を供給すると共に、この水の温度を１０度～４０度の範囲、特に１５度～４０度の範囲、酸素濃度を１～１０ｍｇ／Ｌに維持して、前記微生物資材の前記胞子を発芽させて、活性化させる。前記水温を前記の範囲に維持するため、冷暖設備を備えていても良い。また、酸素濃度を前記の範囲に維持するため、前記酸素供給手段７４からの酸素（空気）の供給を受けるようにする。なお、この微生物活性化装置７０において、芽胞が発芽するには、発芽の環境が整ってから、５分以上掛かるため、微生物資材が競合するグラム陰性菌を極力含まないこの微生物活性化装置７０に５分以上滞留した後、生物処理槽５４に投入される。 The first microbial activation device 70 receives the microbial material from the microbial material manufacturing device 62, supplies the microbial material with water from the water supply means 72, and adjusts the temperature of this water to 10°C. The spores of the microbial material are germinated and activated by maintaining an oxygen concentration of 1 to 10 mg/L in the range of 40 degrees, particularly in the range of 15 to 40 degrees. In order to maintain the water temperature within the above range, a cooling/heating facility may be provided. Also, in order to maintain the oxygen concentration within the above range, oxygen (air) is supplied from the oxygen supply means 74 . In this microbial activation device 70, it takes 5 minutes or more for spores to germinate after the environment for germination is established. After being retained for 5 minutes or more, it is put into the biological treatment tank 54 .
以上の構成により、本下水処理システム１０においては、生物処理槽５４中に微生物資材製造装置６２からの微生物資材中の芽胞が発芽した微生物（好気性）が、通常の活性汚泥に追加されて供給され、活性汚泥中の有用微生物とともに、下水の有機物の分解処理を効率よく行う。 With the above configuration, in the sewage treatment system 10, microorganisms (aerobic) germinated spores in the microbial material from the microbial material manufacturing device 62 are added to the normal activated sludge and supplied to the biological treatment tank 54. It efficiently decomposes organic matter in sewage together with useful microorganisms in activated sludge.
なお、本発明において、前記好気性微生物としては、例えば、フィルミクテス門のグラム陽性のバシラス綱に属するもの、および／または放線菌門のグラム陽性のアクチノバクテリア綱に属するもの、および/またはクロロフレクサス門のグラム陽性を含み、そして場合により酵母菌をも挙げることができる。
一方、前記嫌気性および通性嫌気性微生物としては、腸内に存在するプロテオバクテリア門のグラム陰性の硫酸塩還元菌を含むもの、および／またはバクテロイデス門のグラム陰性のものを挙げることができる。
In the present invention, the aerobic microorganisms include, for example, those belonging to the Gram-positive Bacillus class of the phylum Firmicutes, and/or those belonging to the Gram-positive Actinobacteria class of the phylum Actinomycota, and/or the phylum Chloroflexus. Gram-positive, and optionally also yeast.
On the other hand, the anaerobic and facultative anaerobic microorganisms include Gram-negative sulfate-reducing bacteria of the phylum Proteobacteria present in the intestine and/or Gram-negative phylum Bacteroidetes.
本下水処理システム１０は、前記中継ポンプ場２０に設置され、あるいは接続された第２微生物活性化装置８０を更に備えている。この微生物活性化装置８０には、該下水処理システムの系のいずれかからの水を該第２微生物活性化装置８０に給送するための第２水給送手段８２、および酸素を該第２微生物活性化装置８０に給送するための第２酸素供給手段８４が接続されている。前記第２水給送手段７２が供給する水としては、処理を受ける前の下水（例えば、前記中継ポンプ場２０のポンプＰより上流の下水）や、消毒槽５８前の最終沈殿池５６から流れ出る水であることが好ましい。これらの水は、前記芽胞を発芽させるために必要な栄養素を含有しており、芽胞の発芽に必要な水分と栄養素を同時に提供できる。 The sewage treatment system 10 further comprises a second microbial activation device 80 installed in or connected to the relay pumping station 20 . The microbial activation device 80 includes a second water feed means 82 for feeding water from any of the systems of the sewage treatment system to the second microbial activation device 80, and oxygen to the second microbial activation device 80. A second oxygen supply means 84 is connected for feeding the microbial activation device 80 . The water supplied by the second water supply means 72 includes sewage before being treated (for example, sewage upstream from the pump P of the relay pumping station 20), and water flowing out from the final sedimentation tank 56 in front of the disinfection tank 58. Water is preferred. These waters contain nutrients necessary for germination of the spores, and can simultaneously provide moisture and nutrients necessary for germination of the spores.
また、第２酸素供給手段７４から供給される酸素は、上述した第１酸素供給手段７４と同様、空気の形で供給されても良い。この場合、酸素発生装置や酸素タンクを特別に設ける必要はない。また、下水中の酸素濃度が、発芽に十分と認められる場合には、空気を、前記ポンプＰ中の下水、ポンプＰから排出された直後の下水に導入してもよい。 Also, the oxygen supplied from the second oxygen supply means 74 may be supplied in the form of air, like the first oxygen supply means 74 described above. In this case, there is no need to provide a special oxygen generator or oxygen tank. Also, if the oxygen concentration in the sewage is deemed sufficient for germination, air may be introduced into the sewage in the pump P or immediately after being discharged from the pump P.
前記第２微生物活性化装置８０は、前記第１微生物活性化装置７０と同様、前記微生物資材製造装置６２からの微生物資材を受け、該微生物資材に、前記第２水給送手段８２からの水を供給すると共に、この水の温度を１０度～４０度の範囲、特に１５度～４０度の範囲、酸素濃度を１～１０ｍｇ／Ｌに維持して、前記微生物資材の前記胞子を発芽させて、活性化させる。前記水温を前記の範囲に維持するため、冷暖設備を備えていても良い。また、酸素濃度を前記の範囲に維持するため、前記酸素供給手段７４からの酸素（空気）の供給を受けるようにする。前記酸素供給手段７４からの酸素（空気）は、また、前記中継ポンプ場２０のいずれかの箇所の下水に供給され、下水中の溶存酸素量を増大させる。なお、この微生物活性化装置８０において、芽胞が発芽するには、上記と同様、通常、発芽の環境が整ってから、５分以上掛かるため、微生物資材が競合するグラム陰性菌を極力含まないこの微生物活性化装置８０に５分以上滞留した後、下水（例えば、前記ポンプ中の下水）に投入されることが好ましい。 Similar to the first microbial activation device 70, the second microbial activation device 80 receives the microbial material from the microbial material manufacturing device 62 and feeds the microbial material with water from the second water supply means 82. is supplied, and the temperature of this water is maintained in the range of 10 to 40 degrees, particularly in the range of 15 to 40 degrees, and the oxygen concentration is maintained in the range of 1 to 10 mg/L to germinate the spores of the microbial material. , to activate. In order to maintain the water temperature within the above range, a cooling/heating facility may be provided. Also, in order to maintain the oxygen concentration within the above range, oxygen (air) is supplied from the oxygen supply means 74 . Oxygen (air) from the oxygen supply means 74 is also supplied to the sewage at any point in the relay pumping station 20 to increase the amount of dissolved oxygen in the sewage. In this microbial activation device 80, it usually takes five minutes or more for the spores to germinate after the environment for germination is established. After remaining in the microbial activation device 80 for 5 minutes or more, it is preferable to throw it into the sewage (for example, the sewage in the pump).
以上の構成により、本下水処理システム１０においては、中継ポンプ場２０より下流の下水管渠に、発芽した好気性微生物およびもともと下水中に存在していた好気性微生物の酸素の消費にかかわらず、下水中には、十分な酸素が溶存した状態（酸素濃度が増大した状態）となる。
下水の酸素濃度が増大した結果、嫌気性細菌である硫酸塩還元菌を失活化させ硫化水素の生成を抑制する結果として、硫酸生成菌の抑制により硫酸の生成の防止を行うとともに、好気性微生物により、中継ポンプ場直下からの下水管渠の壁面のバイオフィルム内細菌条件を良好な状態に改善させることができ、これによって、硫酸の発生を抑制し、下水管渠の腐食を防止し、長寿命化するとともに、前記好気性微生物の活動により下水自体の清浄化を図り、後の設備の負担を軽減することができる。
With the above configuration, in the sewage treatment system 10, regardless of the consumption of oxygen by germinated aerobic microorganisms and aerobic microorganisms originally present in the sewage, the sewage pipe downstream from the relay pumping station 20 The sewage is in a state in which sufficient oxygen is dissolved (a state in which the oxygen concentration is increased).
As a result of the increase in the oxygen concentration of sewage, anaerobic sulfate-reducing bacteria are deactivated and the production of hydrogen sulfide is suppressed. Microorganisms can improve the bacterial conditions in the biofilm on the wall surface of the sewer culvert from directly below the relay pump station to a favorable state, thereby suppressing the generation of sulfuric acid and preventing corrosion of the sewer culvert, In addition to prolonging the service life, the activity of the aerobic microorganisms purifies the sewage itself, thereby reducing the load on subsequent facilities.
１０ 下水処理システム
２０ 中継ポンプ場
５０ 下水処理設備
５２ 最初沈殿池
５４ 生物処理槽
５６ 最終沈殿池
５８ 消毒槽
６０ 脱水装置
６２ 微生物資材製造装置
７０ 第１微生物活性化装置
７２ 第１水給送手段
７４ 第１酸素供給手段
８０ 第２微生物活性化装置
８２ 第２水給送手段
８４ 第２酸素供給手段
１００ 下水管渠
Ｐ ポンプ
10 Sewage treatment system 20 Relay pumping station 50 Sewage treatment equipment 52 Primary sedimentation tank 54 Biological treatment tank 56 Final sedimentation tank 58 Disinfection tank 60 Dehydration device 62 Microbial material manufacturing device 70 First microorganism activation device 72 First water supply means 74 First oxygen supply means 80 Second microorganism activation device 82 Second water supply means 84 Second oxygen supply means 100 Sewer culvert P Pump
Claims (9)
前記最初沈殿池および最終沈殿池のうち少なくとも最終沈殿池に接続され、最初沈殿池からの余剰汚泥および最終沈殿池からの返送汚泥のうち少なくとも最終沈殿池からの返送汚泥を受け、これを脱水するための脱水手段、
この脱水手段からの脱水汚泥を、温度を６０℃～１１０℃に保った状態で、酸素を供給して、前記脱水汚泥中のグラム陽性の好気性微生物により好気性発酵させ、これによりグラム陰性の嫌気性および通性嫌気性微生物を分解死滅させるとともに、この好気性発酵以降に生成された好気性微生物の芽胞を含有する微生物資材を製造する微生物資材製造装置、
後述する微生物活性化装置に、該下水処理システムの系のいずれかからの水を給送するための水給送手段、
後述する微生物活性化装置に、酸素を供給するための酸素供給手段、および
前記微生物資材製造装置からの微生物資材を受け、かつ前記酸素供給手段からの酸素、および前記水給送手段からの水の供給を受けると共に、この水の温度を１０℃～４０℃に、酸素濃度を１～１０ｍｇ／Ｌに維持して、前記微生物資材の前記芽胞を発芽させて、活性化させ、この活性化された微生物資材を前記中継ポンプ場に供給する微生物活性化装置を備え、
前記好気性微生物が、フィルミクテス門のグラム陽性のバシラス綱に属するもの、および／または放線菌門のグラム陽性のアクチノバクテリア綱に属するもの、および／またはクロロフレクサス門のグラム陽性菌を含む
ことを特徴とする下水処理システム。 A relay pump station for sewage, and at least a biological treatment tank and a final sedimentation tank among a primary sedimentation tank, a biological treatment tank and a final sedimentation tank, receiving sewage from the relay pump station through a sewage pipe, In a sewage treatment system equipped with a sewage treatment facility for treating this,
It is connected to at least the final sedimentation tank of the primary sedimentation tank and the final sedimentation tank, receives the excess sludge from the primary sedimentation tank and the return sludge from the final sedimentation tank, and dewaters the returned sludge from at least the final sedimentation tank. dehydration means for
The dehydrated sludge from this dehydration means is kept at a temperature of 60° C. to 110° C., oxygen is supplied, and the Gram-positive aerobic microorganisms in the dehydrated sludge aerobicly ferment, thereby causing Gram-negative A microbial material manufacturing apparatus that decomposes and kills anaerobic and facultative anaerobic microorganisms and manufactures a microbial material containing spores of aerobic microorganisms generated after this aerobic fermentation,
water feed means for feeding water from any of the systems of the sewage treatment system to the microbial activation device described later;
Oxygen supply means for supplying oxygen to the microbial activation device, which will be described later; While receiving the supply, the temperature of the water is maintained at 10° C. to 40° C. and the oxygen concentration is maintained at 1 to 10 mg/L to germinate and activate the spores of the microbial material, and the activated Equipped with a microbial activation device that supplies microbial materials to the relay pump station,
characterized in that said aerobic microorganisms include those belonging to the Gram-positive class Bacillus of the phylum Firmicutes and/or those belonging to the Gram-positive class Actinobacteria of the phylum Actinomycota and/or Gram-positive bacteria of the phylum Chloroflexus. and sewage treatment system.
9. Any one of claims 1 to 8, wherein said anaerobic and facultative anaerobic microorganisms include Gram-negative sulfate-reducing bacteria of the phylum Proteobacteria and/or Gram-negative phylum Bacteroidetes present in the intestine. Some sewage treatment system.
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| JP2010227790A (en) | 2009-03-26 | 2010-10-14 | Sumiju Kankyo Engineering Kk | Activated sludge treatment apparatus and method |
| US20150353394A1 (en) | 2014-06-05 | 2015-12-10 | Nch Corporation | System and Method for Treating Wastewater |
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| JP2020097024A (en) | 2020-06-25 |
| JP2021058885A (en) | 2021-04-15 |
| JP6792303B2 (en) | 2020-11-25 |
| JP2021003699A (en) | 2021-01-14 |
| JP6777336B2 (en) | 2020-10-28 |
| JP2020142241A (en) | 2020-09-10 |
| JP6852214B2 (en) | 2021-03-31 |
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