JP6739860B2 - Sewage treatment system - Google Patents
Sewage treatment system Download PDFInfo
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- JP6739860B2 JP6739860B2 JP2020031562A JP2020031562A JP6739860B2 JP 6739860 B2 JP6739860 B2 JP 6739860B2 JP 2020031562 A JP2020031562 A JP 2020031562A JP 2020031562 A JP2020031562 A JP 2020031562A JP 6739860 B2 JP6739860 B2 JP 6739860B2
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- 239000010865 sewage Substances 0.000 title claims description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 40
- 239000001301 oxygen Substances 0.000 claims description 40
- 229910052760 oxygen Inorganic materials 0.000 claims description 40
- 230000000813 microbial effect Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 27
- 244000005700 microbiome Species 0.000 claims description 26
- 239000010802 sludge Substances 0.000 claims description 25
- 238000005086 pumping Methods 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 241000894006 Bacteria Species 0.000 claims description 11
- 238000004659 sterilization and disinfection Methods 0.000 claims description 8
- 230000004913 activation Effects 0.000 claims description 6
- 230000035784 germination Effects 0.000 claims description 6
- 235000015097 nutrients Nutrition 0.000 claims description 5
- 238000010564 aerobic fermentation Methods 0.000 claims description 4
- 241000186361 Actinobacteria <class> Species 0.000 claims description 3
- 241001156739 Actinobacteria <phylum> Species 0.000 claims description 3
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 3
- 241000606125 Bacteroides Species 0.000 claims description 3
- 241000192142 Proteobacteria Species 0.000 claims description 3
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 3
- 230000000249 desinfective effect Effects 0.000 claims description 3
- 210000000936 intestine Anatomy 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 241000192125 Firmicutes Species 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000019086 sulfide ion homeostasis Effects 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
- 239000003643 water by type 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
- Treatment Of Sludge (AREA)
- Sewage (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Activated Sludge Processes (AREA)
Description
本発明は、下水処理システムに関し、更に詳細には、中継ポンプ場下流の下水道管渠の劣化防止を可能とし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 particularly to a sewage treatment system capable of preventing deterioration of a sewer pipe downstream of a relay pumping station.
下水道管渠には、時々刻々、家庭や工場・企業所等から、下水が流れ込む。この中には、人の腸内細菌や工場から微生物（主として細菌）が一緒に流れ込む。下水は、下水道管渠を流下する過程で、空気中から酸素を取り込むが、これにも増して、前記微生物が酸素を摂取することにより、一般に無酸素状況になりやすい。その結果、嫌気性細菌である硫酸塩還元菌の活動が活発になり、硫酸塩を使って有機物を分解し、硫化水素ガスを発生する。発生した硫化水素ガスは、下水の悪臭の原因であり、マンホールから作業員が入る時に危険な毒ガスとなっている。それだけではなく、この硫化水素ガスが下水道管渠の空間上部の壁に存在する水膜に溶解すると、その水膜中のバイオフィルムに硫酸生成菌が増殖して、硫酸を生成し、下水道管渠のセメント壁を腐食させて、コンクリート管が劣化・崩壊させることになる。下水道の基本であるコンクリート管の長寿命化は、都市インフラの維持管理上極めて重要な問題である。 Sewage flows into the sewer pipe from home, factory, company, etc. every moment. Microorganisms (mainly bacteria) flow into the intestinal bacteria of humans and factories together. Sewage takes in oxygen from the air in the process of flowing down the sewer pipe, but in addition to this, the microorganisms generally take in oxygen, which makes it easy to become anoxic. As a result, the activity of the anaerobic bacterium sulfate-reducing bacterium becomes active, and the sulfates are used to decompose organic substances and generate hydrogen sulfide gas. The generated hydrogen sulfide gas causes a bad smell of sewage and is a dangerous poison gas when a worker enters from a manhole. Not only that, when this hydrogen sulfide gas dissolves in the water film that exists on the upper wall of the space of the sewer pipe, sulphate-producing bacteria grow in the biofilm in the water film, producing sulfuric acid, and the sewer pipe Will corrode the cement wall and cause the concrete pipe to deteriorate and collapse. Extending the life of concrete pipes, which is the basis of sewerage, is a very important issue for the maintenance of urban infrastructure.
このような問題を解決するため、特公平３−５５１９９号公報では、下水道管渠の途中に、酸素化（酸素付加）器を設け、下水道管渠を流下する下水中の汚泥をこの酸素化器に取り込み、これに酸素を付加し、再び下水管渠を流下する下水にこれを戻すことにより、下水の溶解酸素濃度をポジティブに保つようにした装置を提案している。 In order to solve such a problem, in Japanese Examined Patent Publication No. 3-55199, an oxygenator (oxygen addition) device is provided in the middle of the sewer pipe, and sludge in the sewage flowing down the sewer pipe is treated with this oxygenator. We have proposed a device that keeps the dissolved oxygen concentration in the sewage positive by taking it into the sewage, adding oxygen to it, and returning it to the sewage flowing down the sewer pipe again.
前記特許公報に記載の装置によれば、確かに、下水道管渠中の下水の溶解酸素濃℃をポジティブに保つことができるが、それに留まるものである。 According to the apparatus described in the above patent publication, the dissolved oxygen concentration of sewage in the sewer pipe can be kept positive, but it is limited to that.
そこで本発明は、一歩進んで、中継ポンプ場下流の下水道管渠を流下する下水の溶解酸素濃℃をポジティブに保つとともに、前記下水道管渠の内壁の微生物状態を変えて、該下水道管渠の腐食を防止することのできる下水処理システムを提供することを目的とする。 Therefore, the present invention goes one step further, keeping the dissolved oxygen concentration ℃ of the sewage flowing down the sewer pipe downstream of the relay pumping station positive, and changing the microbial state of the inner wall of the sewer pipe to change the microbial condition of the sewer pipe. It is an object of the present invention to provide a sewage treatment system capable of preventing corrosion.
上記課題は、下記（１）〜（８）の構成の本発明の下水処理システムによって達成される。
（１）
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おいて、
前記最初沈殿池および／または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／または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を好気性発酵させ、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（胞子）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、
前記微生物資材製造装置からの微生物資材を受け、該微生物資材に、前記水給送手段からの水を供給すると共に、この水の温度を１０℃〜４０℃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、活性化させる微生物活性化装置、および
前記中継ポンプ場のポンプ中の下水に、またはポンプから排出された直後の下水に酸素を供給する酸素供給手段を備え、
前記中継ポンプ場から、前記活性化された微生物資材および前記酸素供給手段から供給された酸素を含む下水を前記下水処理設備に送ることを特徴とする下水処理システム。
（２）
前記水給送手段からの水の温度を１５℃〜４０℃の範囲に維持する前記（１）の下水処理システム。
（３）
前記水給送手段からの水が、前記下水処理設備により処理済みの水である前記（１）の下水処理システム。
（４）
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、前記水が、この消毒槽における消毒前の水である前記（３）の下水処理システム。
（５）
前記水給送手段からの水が、前記中継ポンプ場のポンプより上流の下水である前記（１）の下水処理システム。
（６）
前記水給送手段からの水が、前記芽胞の発芽に必要な栄養素を備えている前記（１）〜（５）のいずれかの下水処理システム。
（７）
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を含み、そして酵母菌も含むことのある前記（１）〜（６）のいずれかの下水処理システム。
（８）
前記嫌気性および通性嫌気性微生物が、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である前記（１）〜（７）のいずれかの下水処理システム。
The above problems can be achieved by the sewage treatment system of the present invention having the following configurations (1) to (8).
(1)
It has a relay pump station for sewage discharged from homes, factories, companies, etc., and has a first settling tank, a biological treatment tank and a final settling tank, and receives the sewage from the relay pumping station via a sewer pipe, In a sewage treatment system including sewage treatment equipment for treating this,
Dewatering means connected to the first settling basin and/or the final settling basin, for receiving excess sludge from the first settling basin and/or returning sludge from the final settling basin and dewatering the same.
Oxygen is supplied to the dehydrated sludge from this dehydrating means while maintaining the temperature at 60° C. to 110° C. to aerobically ferment the Gram-positive aerobic microorganisms in the dehydrated sludge, which results in Gram-negative A microbial material manufacturing apparatus for decomposing and killing anaerobic and facultative anaerobic microorganisms, and for manufacturing a microbial material containing spores (spores) of aerobic microorganisms produced after the aerobic fermentation,
A water supply means for supplying water from any of the systems of the sewage treatment system to a microbial activation device described below,
The microbial material from the microbial material manufacturing apparatus is received, water from the water feeding means is supplied to the microbial material, the temperature of the water is in the range of 10°C to 40°C, and the oxygen concentration is 1 to 10 mg/ Oxygen is supplied to the sewage in the pump of the relay pumping station or to the sewage immediately after being discharged from the pump by maintaining the L level to germinate and activate the spores of the microbial material. An oxygen supply means for
A sewage treatment system, wherein sewage containing the activated microbial material and oxygen supplied from the oxygen supply means is sent from the relay pumping station to the sewage treatment facility.
(2)
The sewage treatment system according to (1) above, wherein the temperature of the water from the water feeding means is maintained in the range of 15°C to 40°C.
(3)
The sewage treatment system according to (1), wherein the water from the water feeding means is water that has been treated by the sewage treatment facility.
(4)
The sewage treatment system according to (3), wherein the sewage treatment facility includes a disinfection tank for disinfecting water from the final settling tank, and the water is water before disinfection in the disinfection tank.
(5)
The sewage treatment system according to (1), wherein the water from the water feeding means is sewage upstream of the pump at the relay pumping station.
(6)
The sewage treatment system according to any one of (1) to (5) above, wherein the water from the water feeding means is provided with nutrients necessary for germination of the spores.
(7)
The aerobic microorganisms include those belonging to the gram-positive Bacillus class of the phylum Firmictus and/or those belonging to the gram-positive actinobacteria class of the Actinomycetes, and may also include yeast (1) to The sewage treatment system according to any one of (6).
(8)
(1) to (7), wherein the anaerobic and facultative anaerobic microorganisms include a Gram-negative sulfate-reducing bacterium of the phylum Proteobacteria present in the intestine and/or a gram-negative bacterium of the phylum Bacteroides. ) Either sewage treatment system.
本発明の下水処理システムにおいては、微生物資材製造装置を設けて、この微生物資材製造装置によって、最初沈殿池からの余剰汚泥および／または最終沈殿池からの返送汚泥を含む脱水汚泥を処理することにより、好気性微生物の芽胞を含有する微生物資材を製造し、これを活性化した状態で、中継ポンプ場の下水に供給するとともに、中継ポンプ場のポンプ中の下水に、またはポンプから排出された直後の下水に酸素を供給するようにしたので、中継ポンプ場直下からの下水管渠の壁面の細菌条件を良好な状態に改善させることができ、これによって下水管渠の腐食を防止し、長寿命化した。 In the sewage treatment system of the present invention, by providing a microbial material manufacturing apparatus, by treating the dewatered sludge including excess sludge from the first settling tank and/or return sludge from the final settling tank by this microbial material manufacturing apparatus , Manufacture microbial material containing spores of aerobic microorganisms, supply it to the sewage at the relay pumping station in the activated state, and to the sewage in the pump at the relay pumping station or immediately after discharging from the pump Since oxygen is supplied to the sewage in the sewage system, it is possible to improve the bacterial conditions on the wall surface of the sewage pipe directly below the relay pump station to a good condition, which prevents corrosion of the sewage pipe and increases the service life. Turned into
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。
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。
Hereinafter, a sewage treatment system 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The sewage treatment system 10 receives sewage from the relay pumping station 20 via a relay pumping station 20 for sewage discharged from homes, factories, companies, and the sewer pipe 100, and treats the sewage. The processing equipment 50 is provided. This sewage treatment facility 50 is equipped with a first settling tank 52, a biological treatment tank (aeration tank) 54, a final settling tank 56 and a disinfecting tank 58, as in the case of the ordinary activated sludge method. Cleaned, disinfected and discharged through sewers. The above-described configuration of the sewage treatment facility 50 is a normal one in the sewage treatment system 10 of this type, so further details will be omitted. Further, the relay pumping station 20 includes a pump P connected to a sewer pipe extending from each home or factory.
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６０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 first settling tank 52 and the final settling tank 56, and receives a dewatering device 60 for receiving excess sludge from the first settling tank and returning sludge from the final settling tank and dewatering the sludge. I have it. The dewatering device 60 may receive only one of the excess sludge and the returned sludge and dehydrate the sludge. The dewatering device 60 may be any of dewatering methods such as a centrifugal separation type, a filter press type, and a mechanical concentrating type. The dewatering device 60 removes the excess sludge and/or the returned sludge. The dehydrated sludge has a water content of 65 to 85%.
この脱水装置６０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を好気性発酵させる。この好気性発酵により、グラム陰性の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、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。 A microbial material manufacturing apparatus 62 is connected to the dehydrating apparatus 60. The microbial material manufacturing apparatus 62 supplies oxygen to the dehydrated sludge from the dehydrator 60 while maintaining the temperature at 60°C to 110°C to favor Gram-positive aerobic microorganisms in the dehydrated sludge. Spontaneous fermentation. This aerobic fermentation decomposes and kills Gram-negative anaerobic microorganisms, and depletion of water and nutrients in the dehydrated sludge spent in this aerobic fermentation causes the aerobic microorganisms to become spores, which is harmful. To produce a microbial material containing spores of beneficial aerobic microorganisms, containing as few gram-negative anaerobic and facultative anaerobic microorganisms as possible. The microbial material manufacturing apparatus 62 is provided with a heater for the above-mentioned temperature control and, if necessary, an oxygen (air) supply device.
前記下水処理システム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に給送するための水給送手段７２、および酸素を該微生物活性化装置７０に給送するための酸素供給手段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。
また、酸素供給手段７４から供給される酸素は、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。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。
The sewage treatment system 10 includes a microbial activation device 70 installed or connected to the relay pumping station 20. The microorganism activating device 70 has a water feeding means 72 for feeding water from any of the systems of the sewage treatment system to the microbial activating device 70, and oxygen to the microbial activating device 70. An oxygen supply means 74 for feeding is connected. The water supplied by the water feeding means 72 is sewage before being treated (for example, sewage upstream of the pump P of the relay pumping station 20) or water flowing out from the final settling basin 56 in front of the disinfection tank 58. It is preferable to have. These waters contain nutrients necessary for germination of the spores, and can simultaneously provide the water and nutrients necessary for germination of the spores.
Further, the oxygen supplied from the oxygen supply means 74 may be supplied in the form of air. In this case, it is not necessary to specially provide an oxygen generator or an oxygen tank. Further, when the oxygen concentration in the sewage is found to be 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℃〜４０℃の範囲、特に１５℃〜４０℃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芽胞を発芽させて、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７０において、芽胞が発芽するには、通常、発芽の環境が整ってから、５分以上掛かるため、微生物資材がこの微生物活性化装置７０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。 The microbial activation device 70 receives the microbial material from the microbial material manufacturing device 62, supplies the microbial material with water from the water feeding means 72, and keeps the temperature of the water at 10°C to 40°C. In particular, the oxygen concentration is maintained at 1 to 10 mg/L in the range of 15° C. to 40° C., and the spores of the microbial material are germinated and activated. A cooling/heating facility may be provided to maintain the water temperature in the above range. Further, 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 of the relay pumping station 20 to increase the amount of dissolved oxygen in the sewage. Incidentally, in the microbial activation device 70, it usually takes 5 minutes or more after the germination environment is set up for the spores to germinate, so that after the microbial material stays in the microbial activation device 70 for 5 minutes or more, It is preferable that the sewage (for example, sewage in the pump) is added.
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硫酸生成菌が存在しない、良好な状態に改善させることができ、これによって、硫酸の発生を防いで、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 oxygen consumption of the germinated aerobic microorganisms and the aerobic microorganisms originally present in the sewage, in the sewer pipe downstream of the relay pumping station 20, A sufficient amount of oxygen is dissolved in the sewage (a state in which the oxygen concentration is increased).
As a result of the increased oxygen concentration in the sewage, the anaerobic bacteria sulfate-reducing bacteria are inactivated and hydrogen sulfide production is suppressed. The microorganisms can improve the bacterial conditions in the biofilm on the wall surface of the sewer pipe directly below the relay pump station to a good condition without the presence of sulfuric acid-producing bacteria, thereby preventing the generation of sulfuric acid and It is possible to prevent corrosion of the ditch and prolong the service life, and to purify the sewage itself by the activity of the aerobic microorganisms, thereby reducing the burden on the subsequent equipment.
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 Actinomycetes, and optionally yeast. Mention may also be made of fungi.
On the other hand, examples of the anaerobic and facultative anaerobic microorganisms include those containing a Gram-negative sulfate-reducing bacterium of the phylum Proteobacteria present in the intestine and/or those of the phylum Bacteroides.
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 微生物活性化装置
７２ 水給送手段
７４ 酸素供給手段
１００ 下水管渠
Ｐ ポンプ
10 Sewage Treatment System 20 Relay Pump Station 50 Sewage Treatment Facility 52 First Settling Tank 54 Biological Treatment Tank 56 Final Settling Tank 58 Disinfection Tank 60 Dehydrator 62 Microbial Material Manufacturing Device 70 Microorganism Activator 72 Water Feeding Means 74 Oxygen Supplying Means 100 Sewer pipe P pump
Claims (8)
前記最初沈殿池および／または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／または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を好気性発酵させ、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（胞子）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、
前記微生物資材製造装置からの微生物資材を受け、該微生物資材に、前記水給送手段からの水を供給すると共に、この水の温度を１０℃〜４０℃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、活性化させる微生物活性化装置、および
前記中継ポンプ場のポンプ中の下水に、またはポンプから排出された直後の下水に酸素を供給する酸素供給手段を備え、
前記中継ポンプ場から、前記活性化された微生物資材および前記酸素供給手段から供給された酸素を含む下水を前記下水処理設備に送ることを特徴とする下水処理システム。 It has a relay pump station for sewage discharged from homes, factories, companies, etc., and has a first settling tank, a biological treatment tank and a final settling tank, and receives the sewage from the relay pumping station via a sewer pipe, In a sewage treatment system including sewage treatment equipment for treating this,
Dewatering means connected to the first settling basin and/or the final settling basin, for receiving excess sludge from the first settling basin and/or returning sludge from the final settling basin and dewatering the same.
Oxygen is supplied to the dehydrated sludge from this dehydrating means while maintaining the temperature at 60° C. to 110° C. to aerobically ferment the Gram-positive aerobic microorganisms in the dehydrated sludge, which results in Gram-negative A microbial material manufacturing apparatus for decomposing and killing anaerobic and facultative anaerobic microorganisms, and for manufacturing a microbial material containing spores (spores) of aerobic microorganisms produced after the aerobic fermentation,
A water supply means for supplying water from any of the systems of the sewage treatment system to a microbial activation device described below,
The microbial material from the microbial material manufacturing apparatus is received, water from the water feeding means is supplied to the microbial material, the temperature of the water is in the range of 10°C to 40°C, and the oxygen concentration is 1 to 10 mg/ Oxygen is supplied to the sewage in the pump of the relay pumping station or to the sewage immediately after being discharged from the pump by maintaining the L level to germinate and activate the spores of the microbial material. An oxygen supply means for
A sewage treatment system, wherein sewage containing the activated microbial material and oxygen supplied from the oxygen supply means is sent from the relay pumping station to the sewage treatment facility.
8. The anaerobic and facultative anaerobic microorganisms are those containing a Gram-negative sulfate-reducing bacterium of the phylum Proteobacteria present in the intestine, and/or gram-negative of the phylum Bacteroides. Or sewage treatment system.
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