JP2009207985A - Method for suppressing propagation of algae in sewage treated water and device therefor - Google Patents
Method for suppressing propagation of algae in sewage treated water and device therefor Download PDFInfo
- Publication number
- JP2009207985A JP2009207985A JP2008052898A JP2008052898A JP2009207985A JP 2009207985 A JP2009207985 A JP 2009207985A JP 2008052898 A JP2008052898 A JP 2008052898A JP 2008052898 A JP2008052898 A JP 2008052898A JP 2009207985 A JP2009207985 A JP 2009207985A
- Authority
- JP
- Japan
- Prior art keywords
- treated water
- sewage
- trace metal
- microorganism
- algae
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 239000010865 sewage Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 40
- 241000195493 Cryptophyta Species 0.000 title claims abstract description 29
- 244000005700 microbiome Species 0.000 claims abstract description 82
- 229910021654 trace metal Inorganic materials 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 238000011282 treatment Methods 0.000 claims abstract description 40
- 239000012528 membrane Substances 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 14
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 150000002739 metals Chemical class 0.000 claims abstract description 13
- 230000002829 reductive effect Effects 0.000 claims abstract description 13
- 230000001590 oxidative effect Effects 0.000 claims abstract description 12
- 239000005416 organic matter Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims description 36
- 230000005791 algae growth Effects 0.000 claims description 35
- 150000004706 metal oxides Chemical class 0.000 claims description 26
- 230000003647 oxidation Effects 0.000 claims description 23
- 238000007254 oxidation reaction Methods 0.000 claims description 23
- 230000001076 estrogenic effect Effects 0.000 claims description 18
- 238000004062 sedimentation Methods 0.000 claims description 18
- 230000012010 growth Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 206010053759 Growth retardation Diseases 0.000 claims description 10
- 230000002401 inhibitory effect Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 abstract description 10
- 238000000746 purification Methods 0.000 abstract description 8
- 239000000969 carrier Substances 0.000 abstract description 3
- 239000012716 precipitator Substances 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 16
- 238000009287 sand filtration Methods 0.000 description 15
- 239000010802 sludge Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 10
- 229910052748 manganese Inorganic materials 0.000 description 10
- 229940011871 estrogen Drugs 0.000 description 8
- 239000000262 estrogen Substances 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- DNXHEGUUPJUMQT-UHFFFAOYSA-N (+)-estrone Natural products OC1=CC=C2C3CCC(C)(C(CC4)=O)C4C3CCC2=C1 DNXHEGUUPJUMQT-UHFFFAOYSA-N 0.000 description 6
- DNXHEGUUPJUMQT-CBZIJGRNSA-N Estrone Chemical compound OC1=CC=C2[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CCC2=C1 DNXHEGUUPJUMQT-CBZIJGRNSA-N 0.000 description 6
- 229960003399 estrone Drugs 0.000 description 6
- 241000251468 Actinopterygii Species 0.000 description 5
- 206010049290 Feminisation acquired Diseases 0.000 description 5
- 208000034793 Feminization Diseases 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 235000015097 nutrients Nutrition 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 229930002868 chlorophyll a Natural products 0.000 description 3
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VOXZDWNPVJITMN-ZBRFXRBCSA-N 17β-estradiol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@H](CC4)O)[C@@H]4[C@@H]3CCC2=C1 VOXZDWNPVJITMN-ZBRFXRBCSA-N 0.000 description 2
- 241001474374 Blennius Species 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 229940088597 hormone Drugs 0.000 description 2
- 239000005556 hormone Substances 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000195628 Chlorophyta Species 0.000 description 1
- 241000251511 Holothuroidea Species 0.000 description 1
- 241000199919 Phaeophyceae Species 0.000 description 1
- 241000206572 Rhodophyta Species 0.000 description 1
- 241001261506 Undaria pinnatifida Species 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 210000000750 endocrine system Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229960005309 estradiol Drugs 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 230000000007 visual effect Effects 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
- Biological Treatment Of Waste Water (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
この発明は、下水を浄化処理した後の下水処理水において藻類が増殖するのを抑制する方法、及び下水処理水中のエストロゲン濃度を低下させる方法、並びにそれらの方法に用いられる装置に関するものである。 The present invention relates to a method for suppressing the growth of algae in sewage treated water after purification of sewage, a method for reducing estrogen concentration in sewage treated water, and an apparatus used in these methods.
近年、下水を浄化処理した後の下水処理水を都市内の水資源として有効利用することが求められている。しかしながら、下水処理水は、窒素やリン等の化合物である栄養塩類を高濃度に含むため、都市内水路や池などに再利用した場合に付着藻類や浮遊藻類などの大量発生を引き起こし、景観障害等の問題が発生してしまう。このような問題に対応するため、一般的な下水処理（２次処理）の後工程に高度処理（３次処理）を施し、これらの栄養塩類の濃度を極めて低くする方法、例えば、凝集剤（ＰＡＣ：ポリ塩化アルミニウム等）を大量に加えて化学的にリンを沈殿させて取り除く方法（凝集剤添加活性汚泥法）や、逆浸透膜により窒素やリンを超高度に除去する方法（膜分離法）などが試験的に行われている。しかし、設備費や運転費が共に高価であるという問題があり、普及するには至っていない。 In recent years, it has been required to effectively use sewage treated water after purification of sewage as a water resource in the city. However, sewage treated water contains nutrients that are compounds such as nitrogen and phosphorus in high concentrations, causing a large amount of attached algae and floating algae when reused in urban waterways and ponds. Such problems will occur. In order to deal with such problems, a high-level treatment (tertiary treatment) is applied to the subsequent process of general sewage treatment (secondary treatment), and a method for reducing the concentration of these nutrients extremely, such as a flocculant ( PAC: Polyaluminum chloride, etc.) is added in large amounts to chemically precipitate and remove phosphorus (coagulant-added activated sludge method), or ultra-high removal of nitrogen and phosphorus using a reverse osmosis membrane (membrane separation method) ) Etc. are conducted on a trial basis. However, there is a problem that both the equipment cost and the operation cost are expensive, and it has not been spread.
それに加え、下水には、人体で生成され尿から排出された人由来の女性ホルモン、及び、ある種の合成樹脂や植物由来の女性ホルモンに似た働きをして内分泌系を撹乱する物質（以下、両者を含めてエストロゲン様物質という。）が含まれており、通常の下水処理では、このようなエストロゲン様物質は完全には除去されない。そして、このエストロゲン様物質が下水処理水に極微量であっても含有されていると下水処理水が放流される先の河川等で、魚類等に雌性化の影響を及ぼすことが知られている。下水処理の方法として一般的である活性汚泥処理法において、このようなエストロゲン様物質を十分に除去するには、固形物滞留時間（ＳＲＴ）を比較的大きく取り、溶存酸素濃度を高めに設定することが知られているが、それを実現するには生物反応槽の容量拡張、即ち装置を大型化しなければならず、また、細かな制御が必要となり、設備費、運転費が共に高価になってしまうという問題がある。また、オゾン処理によりエストロゲン様物質を分解する方法（オゾン処理法）も知られているが、この方法も高圧電源を有するオゾン発生装置などを設けなければならず設備費・運転費共に高価になるという問題がある。 In addition, sewage contains substances that disturb the endocrine system by acting in a manner similar to human-derived female hormones produced in the human body and excreted from urine, and certain synthetic resins and plant-derived female hormones (hereinafter referred to as , Both of which are called estrogen-like substances), and such estrogen-like substances are not completely removed by ordinary sewage treatment. And it is known that if this estrogen-like substance is contained in the sewage treated water even in a trace amount, it will affect feminization in fish etc. in the river where the sewage treated water is discharged. . In the activated sludge treatment method, which is a common sewage treatment method, in order to sufficiently remove such estrogen-like substances, the solids residence time (SRT) is set relatively large and the dissolved oxygen concentration is set high. However, in order to realize this, it is necessary to expand the capacity of the biological reaction tank, that is, to increase the size of the apparatus, and to require fine control, which increases both the equipment cost and the operating cost. There is a problem that it ends up. In addition, a method of decomposing estrogen-like substances by ozone treatment (ozone treatment method) is also known, but this method also requires an ozone generator having a high-voltage power source and is expensive both in equipment cost and operation cost. There is a problem.
例えば、特許文献１には、排水原水を、担体を流動させる曝気槽、第１の活性汚泥槽、第２の活性汚泥槽および沈殿槽の順で流し、沈殿槽で沈降した汚泥の全量を第１の活性汚泥槽に返送する排水の処理方法が開示されている。しかし、この特許文献１に記載の排水の処理方法は、前述した一般的な下水処理の方法を改良した、あくまでも排水の処理方法であって、藻類が増殖するのを抑制する方法、及び下水処理水中のエストロゲン濃度を低下させる方法については言及されていない。 For example, in Patent Document 1, raw waste water is flowed in the order of an aeration tank in which a carrier flows, a first activated sludge tank, a second activated sludge tank, and a settling tank. A method for treating wastewater returned to the activated sludge tank 1 is disclosed. However, the wastewater treatment method described in Patent Document 1 is a wastewater treatment method that is an improvement over the above-described general sewage treatment method, and a method for suppressing the growth of algae, and sewage treatment. No mention is made of a method for reducing the concentration of estrogen in water.
また、特許文献２には、被処理水を供給する供給口と処理水を排出する排出口とを備え、アニオン交換基を有するグラフト重合材料を含んでなる担体にエストロゲン分解微生物を固定化した固定化物を内部に備える分解除去生物反応槽を含んでなる、エストロゲン処理装置が開示されている。しかし、この特許文献２に記載のエストロゲン処理装置も、下廃水及び河川水などの環境水中に含まれる１７β−エストラジオールやエストロンなどのエストロゲンを安定かつ効率的に低濃度まで分解除去する技術であり、藻類が増殖するのを抑制する方法に関しては何ら言及されていない。 Patent Document 2 discloses an immobilization in which an estrogen-degrading microorganism is immobilized on a carrier comprising a graft polymerization material having an anion exchange group, and having a supply port for supplying treated water and a discharge port for discharging treated water. Disclosed is an estrogen treatment apparatus comprising a bioreactor for decomposing and removing chemicals therein. However, the estrogen treatment apparatus described in Patent Document 2 is also a technique for stably and efficiently decomposing and removing estrogen such as 17β-estradiol and estrone contained in environmental water such as sewage wastewater and river water to a low concentration, No mention is made of a method for inhibiting the growth of algae.
そこでこの発明は、前記従来の技術の問題点を解決し、下水処理水を再利用する際に懸念される付着藻類や浮遊藻類などの大量発生による景観障害等を防止することができ、且つ、設備費、運転費が共に安価である下水処理水の藻類増殖抑制方法を提供することを目的とする。また、景観障害を防止しつつ下水処理水中のエストロゲン濃度を低下させる方法を提供すること、及びそれらに使用する藻類増殖抑制装置を提供することも目的とする。 Therefore, the present invention solves the problems of the above-mentioned conventional technology, can prevent a landscape failure caused by a large amount of attached algae, floating algae and the like that are concerned when reusing sewage treated water, and An object is to provide a method for suppressing the growth of algae in sewage treated water, both of which are low in equipment cost and operation cost. Moreover, it aims at providing the method of reducing the estrogen density | concentration in sewage treated water, preventing a landscape disorder, and providing the algal growth suppression apparatus used for them.
前記課題を解決するために、請求項１に記載の発明は、下水に浄化処理を施して有機物濃度を低下させた下水処理水を、微生物を担持可能な微生物保持担体が収容された生物反応槽に通水し、この生物反応槽おいて、下部から空気を送り込んで曝気することを継続することにより、藻類の増殖に必要な微量金属を酸化する微量金属酸化微生物を自然発生的に前記微生物保持担体の表面に担持させ、この微量金属酸化微生物により前記下水処理水中に含まれる前記微量金属を酸化して不溶化させる微量金属酸化工程と、前記生物反応槽通過後の処理水から前記微量金属の酸化物を除去する微量金属酸化物除去工程と、を備えることを特徴とする。 In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a biological reaction tank in which a microorganism holding carrier capable of supporting microorganisms is contained in sewage treated water in which sewage is purified to reduce the concentration of organic matter. In this bioreaction tank, by continuing to feed air from the bottom and aeration, trace metal oxidation microorganisms that oxidize trace metals necessary for algae growth are naturally retained by the microorganisms. A trace metal oxidation step for supporting the surface of the carrier and oxidizing and insolubilizing the trace metal contained in the sewage treated water by the trace metal oxidation microorganism, and oxidation of the trace metal from the treated water after passing through the biological reaction tank A trace metal oxide removing step for removing an object.
請求項２に記載の発明は、請求項１において、微量金属酸化物除去工程では、沈殿槽で微量金属の酸化物を沈殿させて除去することを特徴とする。 The invention described in claim 2 is characterized in that, in the trace metal oxide removing step according to claim 1, the trace metal oxide is precipitated and removed in a precipitation tank.
請求項３に記載の発明は、請求項１において、微量金属酸化物除去工程では、濾過装置で微量金属の酸化物を濾過して除去することを特徴とする。 The invention described in claim 3 is characterized in that, in the trace metal oxide removing step according to claim 1, the trace metal oxide is filtered and removed by a filtration device.
請求項４に記載の発明は、請求項１ないし３のいずれかにおいて、微量金属酸化工程において、微量金属酸化微生物に加え、エストロゲン様物質を分解するエストロゲン分解微生物を自然発生的に前記微生物保持担体の表面に担持させ、下水処理水中に含まれる微量金属を酸化して不溶化させると共にエストロゲン様物質を分解することを特徴とする。 According to a fourth aspect of the present invention, in any one of the first to third aspects, in the trace metal oxidation step, in addition to the trace metal oxidation microorganism, an estrogen-degrading microorganism that decomposes an estrogen-like substance is spontaneously generated in the microorganism-supporting carrier. The trace metal contained in the sewage treated water is oxidized and insolubilized, and the estrogen-like substance is decomposed.
請求項５に記載の発明は、下水に浄化処理を施して有機物濃度を低下させた下水処理水に対して、藻類増殖のポテンシャルを低減する装置であって、空気を送り込んで曝気する曝気手段を有し、微生物を担持可能な微生物保持担体を収容する生物反応槽と、この生物反応槽の下流に配置され、前記生物反応槽で生物処理を施した反応槽処理水中に含まれる浮遊物質を除去する浮遊物質除去装置とを備え、前記微生物保持担体は、藻類の増殖に必要な微量金属を酸化する微量金属酸化微生物を担持することを特徴とする。 The invention according to claim 5 is an apparatus for reducing the algae growth potential with respect to the sewage treated water whose organic matter concentration is reduced by purifying the sewage, and comprising aeration means for sending air and aerating A biological reaction tank that contains a microorganism holding carrier capable of supporting microorganisms, and a suspended substance contained in the reaction water treated in the biological reaction tank disposed downstream of the biological reaction tank. The microorganism holding carrier carries a trace metal oxidizing microorganism that oxidizes trace metals necessary for the growth of algae.
請求項６に記載の発明は、請求項５において、浮遊物質除去装置は、浮遊物質を沈殿させて除去する沈殿槽であることを特徴とする。 A sixth aspect of the present invention is characterized in that, in the fifth aspect, the suspended matter removing device is a sedimentation tank that precipitates and removes suspended matter.
請求項７に記載の発明は、請求項５において、浮遊物質除去装置は、粒度の異なった複数の砂層からなる濾材の表面に浮遊物質を吸着させて濾過する砂濾過装置であることを特徴とする。 The invention according to claim 7 is the sand filtration device according to claim 5, wherein the suspended matter removing device is a sand filtration device that adsorbs suspended matter on the surface of a filter medium composed of a plurality of sand layers having different particle sizes and performs filtration. To do.
請求項８に記載の発明は、請求項５において、浮遊物質除去装置は、膜をフィルターとして浮遊物質を濾過する膜分離装置であることを特徴とする。 The invention described in claim 8 is characterized in that, in claim 5, the suspended matter removing device is a membrane separation device that filters suspended matter using a membrane as a filter.
請求項９に記載の発明は、請求項５ないし８のいずれかにおいて、微生物保持担体は、微量金属酸化微生物に加え、エストロゲン様物質を分解するエストロゲン分解微生物を担持することを特徴とする。 The invention described in claim 9 is characterized in that, in any of claims 5 to 8, the microorganism-supporting carrier carries an estrogen-degrading microorganism that decomposes an estrogen-like substance in addition to a trace amount of metal-oxidized microorganism.
請求項１０に記載の発明は、請求項５ないし９のいずれかにおいて、微生物保持担体は、比重が１程度の樹脂製であることを特徴とする。 A tenth aspect of the present invention is characterized in that, in any of the fifth to ninth aspects, the microorganism holding carrier is made of a resin having a specific gravity of about 1.
請求項１に記載の発明は、前記のように、下水に浄化処理を施して有機物濃度を低下させた下水処理水を、微生物を担持可能な微生物保持担体が収容された生物反応槽に通水し、この生物反応槽おいて、下部から空気を送り込んで曝気することを継続することにより、藻類の増殖に必要な微量金属を酸化する微量金属酸化微生物を自然発生的に前記微生物保持担体の表面に担持させ、この微量金属酸化微生物により前記下水処理水中に含まれる前記微量金属を酸化して不溶化させる微量金属酸化工程と、前記生物反応槽通過後の処理水から前記微量金属の酸化物を除去する微量金属酸化物除去工程と、を備えるので、下水処理水の藻類増殖ポテンシャルを大幅に低減することができる。そのため、下水処理水を再利用する際に問題となる夏場の藻類の大量発生を確実に防ぐことができ、景観障害等の問題を解決することができる。そのうえ、設備費や運転費も安価である。 According to the first aspect of the present invention, as described above, the sewage treated water in which the sewage is subjected to purification treatment to reduce the organic substance concentration is passed through the biological reaction tank in which the microorganism holding carrier capable of supporting microorganisms is accommodated. In this biological reaction tank, trace metal-oxidizing microorganisms that oxidize trace metals necessary for algae growth are naturally generated by continuing to feed air from the bottom and aerate. And a trace metal oxidation step in which the trace metal contained in the sewage treated water is oxidized and insolubilized by the trace metal oxidation microorganism, and the trace metal oxide is removed from the treated water after passing through the biological reaction tank. And the step of removing the trace metal oxide, the algal growth potential of the sewage treated water can be greatly reduced. Therefore, it is possible to reliably prevent the generation of a large amount of summer algae, which becomes a problem when reusing sewage treated water, and to solve problems such as landscape obstacles. In addition, equipment and operating costs are low.
請求項２に記載の発明は、微量金属酸化物除去工程では、沈殿槽で微量金属の酸化物を沈殿させて除去するので、つまり、運転費があまり掛からない沈殿槽で微量金属の酸化物を除去するので、前記効果に加え、更に運転費を安価にすることができる。 In the second aspect of the invention, in the trace metal oxide removal step, the trace metal oxide is precipitated and removed in the precipitation tank, that is, the trace metal oxide is removed in the precipitation tank which does not require much operating cost. Since it is removed, in addition to the above effects, the operating cost can be further reduced.
請求項３に記載の発明は、微量金属酸化物除去工程では、濾過装置で微量金属の酸化物を濾過して除去するので、前記効果に加え、微量金属酸化物の除去性能を向上することができ、且つ、設備費・運転費共に安価である。 According to the third aspect of the present invention, in the trace metal oxide removing step, the trace metal oxide is filtered and removed by a filtration device. In addition to the above effects, the trace metal oxide removal performance can be improved. It is possible, and both equipment cost and operation cost are low.
請求項４に記載の発明は、微量金属酸化工程において、微量金属酸化微生物に加え、エストロゲン様物質を分解するエストロゲン分解微生物を自然発生的に微生物保持担体の表面に担持させ、下水処理水中に含まれる微量金属を酸化して不溶化させると共にエストロゲン様物質を分解するので、前記効果に加え、下水処理水中に含まれるエストロゲン様物質を分解することができ、下水処理水が放流される先の河川等で、魚類等に雌性化の影響を及ぼす虞が少なくなる。 The invention according to claim 4 includes, in the trace metal oxidation step, an estrogen-degrading microorganism that decomposes an estrogen-like substance spontaneously supported on the surface of the microorganism-supporting carrier in addition to the trace metal oxidation microorganism, and is contained in the sewage treated water. In addition to the above effects, the estrogen-like substance contained in the sewage treated water can be decomposed, and the river where the sewage treated water is discharged, etc. Thus, there is less risk of having feminization on fish and the like.
請求項５に記載の発明は、下水に浄化処理を施して有機物濃度を低下させた下水処理水に対して、藻類増殖のポテンシャルを低減する装置であって、空気を送り込んで曝気する曝気手段を有し、微生物を担持可能な微生物保持担体を収容する生物反応槽と、この生物反応槽の下流に配置され、生物反応槽で生物処理を施した反応槽処理水中に含まれる浮遊物質を除去する浮遊物質除去装置とを備え、微生物保持担体は、藻類の増殖に必要な微量金属を酸化する微量金属酸化微生物を担持するので、下水処理水の藻類増殖のポテンシャルを大幅に低減することができる。そのため、下水処理水を再利用する際に問題となる夏場の藻類の大量発生を確実に防ぐことができ、景観障害等の問題を解決することができる。そのうえ、設備費や運転費も安価である。 The invention according to claim 5 is an apparatus for reducing the algae growth potential with respect to the sewage treated water whose organic matter concentration is reduced by purifying the sewage, and comprising aeration means for sending air and aerating A biological reaction tank having a microorganism holding carrier capable of supporting microorganisms, and a suspended substance contained in the reaction water treated in the biological reaction tank disposed downstream of the biological reaction tank. Since the microorganism-supporting carrier is equipped with a floating substance removing device and the microorganism-supporting carrier carries trace metal-oxidizing microorganisms that oxidize trace metals necessary for the growth of algae, the potential for algae growth in sewage treated water can be greatly reduced. Therefore, it is possible to reliably prevent the generation of a large amount of summer algae, which becomes a problem when reusing sewage treated water, and to solve problems such as landscape obstacles. In addition, equipment and operating costs are low.
請求項６に記載の発明は、浮遊物質除去装置は、浮遊物質を沈殿させて除去する沈殿槽であるので、前記効果に加え、更に運転費を安価にすることができる。 According to the sixth aspect of the present invention, since the suspended matter removing device is a sedimentation tank that precipitates and removes suspended matter, in addition to the above effects, the operating cost can be further reduced.
請求項７に記載の発明は、浮遊物質除去装置は、粒度の異なった複数の砂層からなる濾材の表面に浮遊物質を吸着させて濾過する砂濾過装置であるので、前記効果に加え、浮遊物質除去性能を向上させることができ、且つ、設備費も安価である。 The invention according to claim 7 is a sand filtration device for adsorbing and filtering suspended substances on the surface of a filter medium composed of a plurality of sand layers having different particle sizes. The removal performance can be improved and the equipment cost is low.
請求項８に記載の発明は、浮遊物質除去装置は、膜をフィルターとして浮遊物質を濾過する膜分離装置であるので、前記効果に加え、更に浮遊物質除去性能を向上させることができ、且つ、装置を小型化することができる。 The invention according to claim 8 is a membrane separation device that filters floating substances using a membrane as a filter. In addition to the above-described effect, the floating substance removal device can further improve floating substance removal performance, and The apparatus can be miniaturized.
請求項９に記載の発明は、微生物保持担体は、微量金属酸化微生物に加え、エストロゲン様物質を分解するエストロゲン分解微生物を担持するので、前記効果に加え、下水処理水中に含まれるエストロゲン様物質を分解することができ、下水処理水が放流される先の河川等で、魚類等に雌性化の影響を及ぼす虞が少なくなる。 According to the ninth aspect of the present invention, since the microorganism-supporting carrier carries the estrogen-degrading microorganism that decomposes the estrogen-like substance in addition to the trace metal oxidation microorganism, in addition to the above effect, the estrogen-like substance contained in the sewage treated water The possibility of having feminization on fish and the like is reduced in the river where the sewage treated water is discharged, etc.
請求項１０に記載の発明は、微生物保持担体は、比重が１程度の樹脂製であるので、前記効果に加え、微生物保持担体をより効果的に流動化させることができ、微量金属酸化微生物及びエストロゲン分解微生物の生物反応を促進することができる。このため、微量金属の酸化、及びエストロゲン様物質の分解が効率的になる。 In the invention described in claim 10, since the microorganism holding carrier is made of a resin having a specific gravity of about 1, in addition to the above-described effects, the microorganism holding carrier can be fluidized more effectively. The biological reaction of estrogen-degrading microorganisms can be promoted. For this reason, oxidation of trace metals and decomposition of estrogen-like substances become efficient.
この発明の一実施の形態を、図面を参照して説明する。 An embodiment of the present invention will be described with reference to the drawings.
［実施の形態１］
先ず、本発明の第１の実施の形態について図１〜３を用いて説明する。
図１は、本発明の第１の実施の形態に係る下水処理水の藻類増殖抑制方法及びその装置の概要を示す概略図であり、図２は、本発明の実施の形態に係る生物反応槽の概略構成を示す構成説明図、図３は、本発明の実施の形態に係る微生物保持担体の写真である。図中の符号１は、下水処理施設であり、符号２は、生物反応槽であり、符号３は、沈殿槽である。
[Embodiment 1]
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram showing an outline of an algal growth suppression method and apparatus therefor according to a first embodiment of the present invention, and FIG. 2 is a biological reaction tank according to an embodiment of the present invention. FIG. 3 is a photograph of a microorganism-retaining carrier according to an embodiment of the present invention. Reference numeral 1 in the figure is a sewage treatment facility, reference numeral 2 is a biological reaction tank, and reference numeral 3 is a sedimentation tank.
この下水処理施設１は、一般的な既知の下水処理施設であり、特に以下に述べる形態に限定されるものではない。この下水処理施設１について、例えば、通常の活性汚泥法によるものを例に挙げて説明すると、先ず、図示しない流入水沈砂池でゴミや土砂を取り除き、次に、最初の沈殿池において下水をゆっくり流すことで粒子径の大きな浮遊物質を沈殿させる（１次処理）。この沈殿させた浮遊物質は、別個の汚泥処理施設に搬送し、そこで減量化されて最終的にはその多くが焼却処分される。そして、下水を最初の沈殿池から図示しないエアレーションタンクに流入させて、そこで活性汚泥と混合させたのち曝気手段で曝気することにより空気を送り込んで活性汚泥中の（好気的な）微生物群の活動により下水を浄化する。次に、この処理された水と活性汚泥が入り混じった処理水を最終沈澱池に送り、処理水をゆっくり流すことにより活性汚泥を沈めて、下水に浄化処理を施した下水処理水を得る（２次処理）。通常の下水処理施設では、この後、下水処理水を塩素混和池へ送り、そこで塩素（例えば、次亜塩素酸塩）を混和して消毒して河川等に放流される。なお、活性汚泥法による下水処理施設の他に、例えば、生物膜法によるものが挙げられる。 The sewage treatment facility 1 is a general known sewage treatment facility, and is not particularly limited to the form described below. The sewage treatment facility 1 will be described by taking, for example, an ordinary activated sludge method as an example. First, dust and earth and sand are removed in an inflow water settling basin (not shown), and then sewage is slowly discharged in the first settling basin. By flowing, suspended substances with a large particle size are precipitated (primary treatment). This precipitated suspended matter is transported to a separate sludge treatment facility where it is reduced in volume and finally most of it is incinerated. Then, the sewage is introduced into the aeration tank (not shown) from the first sedimentation basin, mixed with the activated sludge there, and then aerated by aeration means to send in air, and the (aerobic) microorganism group in the activated sludge Purify sewage through activities. Next, the treated water mixed with the treated water and activated sludge is sent to the final sedimentation basin, and the activated sludge is submerged by slowly flowing the treated water to obtain sewage treated water that has been subjected to purification treatment on the sewage ( Secondary processing). In a normal sewage treatment facility, sewage treatment water is then sent to a chlorine mixing pond where chlorine (eg, hypochlorite) is mixed to disinfect and discharged into a river or the like. In addition to the sewage treatment facility by the activated sludge method, for example, a biofilm method is used.
本発明に係る藻類増殖抑制方法や装置が対象としているのは、このように、下水に一般的な浄化処理（例えば、活性汚泥法や生物膜法など）を施して有機物の濃度を低下させた下水処理水（２次処理水）である。勿論、この下水処理水に前記背景技術で述べた高度処理を施したり、活性汚泥法の処理条件や処理フローを工夫した高度処理法により下水の浄化処理を行ったりして、栄養塩類を低下させたもの（高度処理水）であっても構わない。また、下水とは、家庭からの生活雑排水や汚水、工場排水、雨水などが混合されたものを指している。 As described above, the method and apparatus for inhibiting algal growth according to the present invention are intended to reduce the concentration of organic substances by applying a general purification treatment (for example, an activated sludge method or a biofilm method) to sewage. Sewage treated water (secondary treated water). Of course, this sewage treated water is subjected to the advanced treatment described in the background art above, or the sewage purification treatment is carried out by an advanced treatment method that devises the treatment conditions and treatment flow of the activated sludge method to reduce nutrients. It may be a fresh water (highly treated water). The sewage refers to a mixture of household wastewater, sewage, factory wastewater, rainwater, etc. from households.
生物反応槽２は、空気を送り込んで曝気する曝気手段を有し、微生物を担持可能な微生物保持担体Ｓを収容しており、好気的な条件下で微生物保持担体Ｓを流動化して微生物保持担体Ｓに自然発生的に担持される微生物の生物反応により下水処理水に生物学的な処理を施して浄化する装置である。この生物反応槽２は、下水処理水を流入させて水理学的滞留時間が２時間程度になるように調整して、次工程である沈殿槽３に送水するよう構成されている。 The biological reaction tank 2 has aeration means for supplying air and aerating it, and contains a microorganism holding carrier S capable of supporting microorganisms. The microorganism holding carrier S is fluidized under aerobic conditions to hold microorganisms. The apparatus purifies the sewage treated water by biological treatment by the biological reaction of microorganisms naturally supported on the carrier S. This biological reaction tank 2 is configured so that sewage treated water is introduced and adjusted so that the hydraulic retention time is about 2 hours, and then sent to the precipitation tank 3 which is the next step.
図２に示すように、この生物反応槽２は、有底の略円筒状又は箱状の水密性がある上部が開放され、又は覆蓋された反応槽本体であるタンク２０を備えている。このタンク２０は、下部に曝気手段である散気板２１が設けられ、この散気板２１から図示しない空気圧送手段により空気の気泡を発生させて、曝気して微生物保持担体Ｓを流動化する構成となっている。また、タンク２０には、下水処理水を処理した処理水の上澄み液を次工程に流すための流出口２２と、この流出口２２から微生物保持担体Ｓが処理水と一緒に流出しないようにするためのスクリーン２３が設けられている。このスクリーン２３は、耐蝕性を考慮してステンレス製にすると好ましい。 As shown in FIG. 2, the biological reaction tank 2 includes a tank 20 that is a reaction tank main body having a bottomed, generally cylindrical or box-shaped watertight upper portion that is open or covered. The tank 20 is provided with a diffuser plate 21 as an aeration unit at the lower portion, and air bubbles are generated from the diffuser plate 21 by a pneumatic feeding unit (not shown), and aerated to fluidize the microorganism holding carrier S. It has a configuration. Further, in the tank 20, the supernatant 22 of the treated water treated with the sewage treated water is passed to the next step, and the microorganism holding carrier S is prevented from flowing out from the outlet 22 together with the treated water. A screen 23 is provided. The screen 23 is preferably made of stainless steel in consideration of corrosion resistance.
また、微生物保持担体は、表面に微生物が付着し易いようにある程度の凹凸があり、空気曝気により容易に流動化するものであれば形状及び材質については特に限定されないが、本実施の形態では、図３に示すように、微生物保持担体Ｓは、樹脂からなり１に近い比重を持ち、中空円筒状に成形されている。このように、本実施の形態に係る微生物保持担体Ｓは、中空円筒状に形成されているので、処理対象である下水処理水との接触面積を体積に比して大きく取ることができ、このため、担持している微生物の生物反応を促進することができる。また、比重が１程度の樹脂製であるので、下部から散気板２１で曝気するだけで容易に流動化して、満遍なく下水処理水と接触して、均一に浄化することができる。 In addition, the microorganism holding carrier has a certain degree of unevenness so that microorganisms can easily adhere to the surface, and the shape and material are not particularly limited as long as it can be easily fluidized by air aeration. As shown in FIG. 3, the microorganism holding carrier S is made of a resin, has a specific gravity close to 1, and is formed in a hollow cylindrical shape. Thus, since the microorganism-retaining carrier S according to the present embodiment is formed in a hollow cylindrical shape, the contact area with the sewage treated water that is the treatment target can be taken larger than the volume. Therefore, the biological reaction of the supported microorganism can be promoted. In addition, since the resin is made of resin having a specific gravity of about 1, it can be easily fluidized simply by aeration with the diffuser plate 21 from the lower part, and uniformly contacted with the sewage treated water and purified uniformly.
ところで、従来から藻類の増殖に必要な微量金属（例えば、マンガンＭｎ）を酸化する微量金属酸化微生物やエストロゲン様物質の分解能を有するエストロゲン分解微生物が存在することが知られている。しかし、これらの微量金属酸化微生物やエストロゲン分解微生物は、増殖速度が遅く他の有機物分解微生物との競合に負けてしまい、下水処理施設１で説明したような通常の活性汚泥中には、優位的に存在することができない。 By the way, it is conventionally known that there are trace metal oxidizing microorganisms that oxidize trace metals (for example, manganese Mn) necessary for the growth of algae and estrogen-degrading microorganisms having the resolution of estrogen-like substances. However, these trace metal oxidation microorganisms and estrogen-degrading microorganisms have a slow growth rate and lose the competition with other organic matter-decomposing microorganisms, and are superior in ordinary activated sludge as described in the sewage treatment facility 1. Can't exist.
一方、本発明の実施の形態に係る生物反応槽２では、前述のように有機物濃度を低下させた下水処理水を流入させて原水としており、この下水処理水は、既に浄化処理がなされて一般的な有機物分解微生物の餌となる有機物の濃度が低下している。このため、一般的な有機物分解微生物があまり増殖することができず、反対に、微量金属酸化微生物やエストロゲン分解微生物が繁殖し易い環境となっている。その上、生物反応槽２には、繁殖したこれらの微生物が処理水の流れに流されて流出しないように微生物保持担体Ｓが添加され、それらの微生物保持担体Ｓが流出しないようにスクリーン２３が設けられており、生物反応槽２内に微量金属酸化微生物やエストロゲン分解微生物がとどまって増殖できるようになっている。そのため、生物反応槽２において、下水処理水を水理学的滞留時間が２時間程度の一定の速度で通水し、散気板２１で下部から空気を送り込んで曝気することを継続することにより、微量金属酸化微生物やエストロゲン分解微生物を自然発生的に微生物保持担体Ｓの表面に担持させて、他の微生物に比して優位的に存在させることができる。このため、生物反応槽２は、微量金属酸化微生物により下水処理水中に含まれる微量金属を酸化して不溶化させると共に、エストロゲン様物質を分解することができる。 On the other hand, in the biological reaction tank 2 according to the embodiment of the present invention, the sewage treated water having a reduced organic substance concentration is introduced as raw water as described above, and this sewage treated water has already been subjected to purification treatment in general. The concentration of organic matter that feeds on organic matter-degrading microorganisms has decreased. For this reason, general organic matter-decomposing microorganisms cannot grow so much, and on the contrary, an environment in which trace metal oxidation microorganisms and estrogen-degrading microorganisms are easy to propagate. In addition, a microorganism holding carrier S is added to the biological reaction tank 2 so that these propagated microorganisms are not flowed out of the treated water flow, and a screen 23 is provided to prevent these microorganism holding carriers S from flowing out. It is provided so that trace metal oxidizing microorganisms and estrogen-degrading microorganisms can stay in the biological reaction tank 2 and grow. Therefore, in the biological reaction tank 2, by passing the sewage treated water at a constant speed with a hydraulic residence time of about 2 hours, and continuing to aerate by sending air from the lower part with the diffuser plate 21, Trace metal oxidation microorganisms and estrogen-degrading microorganisms can be naturally supported on the surface of the microorganism-supporting carrier S, and can be made to exist predominantly compared to other microorganisms. Therefore, the biological reaction tank 2 can oxidize and insolubilize the trace metals contained in the sewage treated water by the trace metal oxidizing microorganisms and decompose the estrogen-like substance.
また、図１に示す沈殿槽３は、浮遊物質除去装置の一例として示すものであり、生物反応槽２の下流側に配置され、下水処理水を生物反応槽２で前述のように処理した反応槽処理水中に含まれる浮遊物質ＳＳ（Suspended Solid）を沈殿させて除去する装置である。
図１で示すように、沈殿槽３は、生物反応槽２の下流側に配置して、処理対象を反応槽処理水としているので、この浮遊物質ＳＳには、前述の微量金属酸化微生物で酸化して不溶化した微量金属の酸化物が含まれている。つまり、本実施の形態に係る沈殿槽３によれば、浮遊物質ＳＳと共に微量金属酸化物を沈殿させて除去することができる。
Moreover, the sedimentation tank 3 shown in FIG. 1 is shown as an example of the suspended solid removal apparatus, and is disposed downstream of the biological reaction tank 2 and is a reaction in which sewage treated water is treated in the biological reaction tank 2 as described above. It is an apparatus that precipitates and removes suspended solids SS (Suspended Solid) contained in the tank treated water.
As shown in FIG. 1, the sedimentation tank 3 is disposed downstream of the biological reaction tank 2, and the treatment target is the reaction tank treated water. Therefore, the suspended solid SS is oxidized by the aforementioned trace metal oxidation microorganism. Insoluble trace metal oxides are contained. That is, according to the sedimentation tank 3 according to the present embodiment, it is possible to precipitate and remove the trace metal oxide together with the suspended matter SS.
［実施の形態２］
次に、本発明の第２の実施の形態について図４を用いて説明する。
図４は、本発明の第２の実施の形態に係る下水処理水の藻類増殖抑制方法及びその装置の概要を示す概略図である。第１の実施の形態と相違する点は、浮遊物質除去装置の１例として示した沈殿槽３が砂濾過装置３’に置き代わっている点だけであり、同じ構成は、同じ符号を付して説明を省略する。
[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a schematic diagram showing an outline of an algal growth suppression method and apparatus for sewage treated water according to the second embodiment of the present invention. The difference from the first embodiment is only that the sedimentation tank 3 shown as an example of the suspended solids removal device is replaced with a sand filtration device 3 ′, and the same components are denoted by the same reference numerals. The description is omitted.
図示する砂濾過装置３’は、生物反応槽２の下流側に配置され、濾材Ｆとして粒度の違う砂や砂利から構成された複数の砂の層を備え、この層に生物反応槽２で処理した反応槽処理水を通水して、この反応槽処理水に含まれる浮遊物質ＳＳを濾材である砂粒の表面に吸着して濾過する装置である。前述のように、浮遊物質ＳＳには、微量金属酸化微生物で酸化して不溶化した微量金属の酸化物が含まれているため、濾過することで、微量金属酸化物も除去することができる。また、濾過して除去するので、実施の形態１で示した沈殿槽３より微量金属酸化物の除去性能が格段に向上する。また、砂や砂利は安価であり、運転費も初期の設備費もあまり高価とならない。 The illustrated sand filtration device 3 ′ is disposed on the downstream side of the biological reaction tank 2, and includes a plurality of sand layers composed of sand and gravel having different particle sizes as the filter medium F, and this layer is treated in the biological reaction tank 2. In this device, the treated water treated in water is passed through, and the suspended matter SS contained in the treated water in the reaction tank is adsorbed on the surface of sand particles as a filter medium and filtered. As described above, since the suspended solid SS contains a trace metal oxide oxidized and insolubilized by a trace metal oxidizing microorganism, the trace metal oxide can also be removed by filtration. Moreover, since it removes by filtering, the removal performance of a trace amount metal oxide improves markedly from the precipitation tank 3 shown in Embodiment 1. FIG. Also, sand and gravel are inexpensive, and neither operating costs nor initial equipment costs are very expensive.
［実施の形態３］
次に、本発明の第３の実施の形態について図５を用いて説明する。
図５は、本発明の第３の実施の形態に係る下水処理水の藻類増殖抑制方法及びその装置の概要を示す概略図である。第１の実施の形態と相違する点は、浮遊物質除去装置の一例として示した沈殿槽３が膜分離装置３”になっている点だけであり、同じ構成は、同じ符号を付して説明を省略する。
[Embodiment 3]
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a schematic diagram showing an outline of an algal growth suppression method and apparatus for sewage treated water according to the third embodiment of the present invention. The only difference from the first embodiment is that the sedimentation tank 3 shown as an example of the suspended substance removing device is a membrane separation device 3 ″, and the same components are described with the same reference numerals. Is omitted.
膜分離装置３”は、生物反応槽２の下流側に配置され、精密濾過膜をフィルターとして浮遊物質ＳＳを濾過する装置である。前述のように、浮遊物質ＳＳには、微量金属酸化微生物で酸化して不溶化した微量金属の酸化物が含まれているため、濾過することで、微量金属酸化物も除去することができる。また、膜をフィルターとして濾過するので、実施の形態２で示した砂濾過装置３’より微量金属酸化物の除去性能がさらに向上する。 The membrane separation device 3 ″ is a device that is disposed on the downstream side of the biological reaction tank 2 and filters the suspended matter SS using the microfiltration membrane as a filter. As described above, the suspended matter SS includes trace metal oxidation microorganisms. Since trace metal oxides oxidized and insolubilized are contained, trace metal oxides can also be removed by filtration, and the membrane is filtered as a filter. The ability to remove trace metal oxides is further improved than the sand filtration device 3 ′.
（効果確認実験１）
藻類増殖の抑制効果を確認するために、下水処理水、沈殿槽処理水、砂濾過処理水を試験池に滞留時間１４日で連続的に供給した場合の藻類の発生状況を確認する以下の実験を行った。図６は、下水処理水、沈殿槽処理水、砂濾過処理水の藻類の発生状況を示す写真である。写真の左からａが下水処理水、ｂが沈殿槽処理水、ｃが砂濾過処理水であり、目視で明らにｂ、ｃの水の色（濃さ）が薄く、沈殿槽処理水及び砂濾過処理水において藻類増殖の抑制効果が認められる。
(Effect confirmation experiment 1)
In order to confirm the effect of suppressing the growth of algae, the following experiment was conducted to confirm the state of algae generation when sewage treated water, sedimentation tank treated water, and sand filtration treated water were continuously supplied to the test pond with a residence time of 14 days. Went. FIG. 6 is a photograph showing the algae generation status of sewage treated water, sedimentation tank treated water, and sand filtered treated water. From the left of the picture, a is sewage treated water, b is sedimentation tank treated water, c is sand filtration treated water, and the color (darkness) of water b and c is clearly thin, An inhibitory effect on algal growth is observed in the sand-filtered water.
上記表１は、下水処理水、沈殿槽処理水、砂濾過処理水のそれぞれの水質を示す表である。特筆すべきは、下水処理水に比べて、沈殿槽処理水及び砂濾過処理水の溶解性マンガン（Ｄ−Ｍｎ）の濃度が大きく低下していることである。また、砂濾過処理水においては、全マンガン（Ｔ−Ｍｎ）の濃度も低くなっている。これは、砂濾過装置により、粒子状のマンガンも除去できたことを示しており、粒子状のマンガンが放流先で後々、溶解する可能性も少なくなっていることが分かる。 Table 1 is a table showing the water quality of each of sewage treated water, settling tank treated water, and sand filtered treated water. It should be noted that the concentration of soluble manganese (D-Mn) in the precipitation tank treated water and sand filtered treated water is greatly reduced as compared with the sewage treated water. Moreover, in the sand filtration treated water, the concentration of total manganese (T-Mn) is also low. This indicates that the particulate manganese can also be removed by the sand filtration device, and it can be seen that the possibility of the particulate manganese being dissolved later at the discharge destination is reduced.
図７は、藻類増殖をクロロフィルａの濃度を累積頻度分布で示すグラフである。（ａ）が下水処理水と沈殿槽処理水を比較したもので、（ｂ）が下水処理水と砂濾過処理水を比較したものである。図６の目視確認でも明らかであったが、図７のクロロフィルａ量（濃度）［μｇ／Ｌ］からも、試験池において、沈殿槽処理水や砂濾過処理水を供給した場合に、藻類増殖が顕著に抑制されていることが認められる。 FIG. 7 is a graph showing the algal growth and the concentration of chlorophyll a as a cumulative frequency distribution. (A) compares sewage treated water and settling tank treated water, and (b) compares sewage treated water and sand filtered treated water. As is apparent from the visual confirmation of FIG. 6, from the amount of chlorophyll a (concentration) [μg / L] in FIG. It is recognized that is significantly suppressed.
（増殖抑制メカニズム）
以上のように、この実験においては、外部から薬剤等を加えていないことから、前述のように藻類増殖抑制効果が認められる原因は、藻類に必要な栄養素が不足したことによると推察される。通常、環境水中における藻類増殖の律速因子はリンであり、この濃度の高低によって藻類増殖可能性の大小が論議される場合が多い。しかし、沈殿槽処理水及び砂濾過処理水のリン（Ｔ−Ｐ）濃度は０．４０ｍｇ／Ｌ（表１参照）程であり、一般的に藻類増殖が抑制されると云われるリン濃度０．０１ｍｇ／Ｌを大きく超えていることから、リン濃度が藻類増殖を抑制しているとは考え難い。一方、従来、マンガンＭｎは、環境水中に通常、０．１ｍｇ／Ｌ度含まれるが、これが藻類増殖を抑制することはないと考えられていた。
(Proliferation suppression mechanism)
As described above, in this experiment, since a drug or the like is not added from the outside, it is presumed that the cause of the algal growth inhibitory effect as described above is due to a lack of nutrients necessary for the algae. Usually, the rate-limiting factor for algal growth in environmental water is phosphorus, and the level of algal growth potential is often discussed depending on the level of this concentration. However, the phosphorus (TP) concentration in the sedimentation tank treated water and the sand filtration treated water is about 0.40 mg / L (see Table 1), and the phosphorus concentration generally said to suppress algal growth is 0.00. Since it greatly exceeds 01 mg / L, it is difficult to think that the phosphorus concentration suppresses algal growth. On the other hand, conventionally, manganese Mn is usually contained in the environmental water at a concentration of 0.1 mg / L, but it has been thought that this does not inhibit algae growth.
しかし、本願発明者らは、下水処理水には、平均値として溶解性マンガン（Ｄ−Ｍｎ）が０．０４５ｍｇ／Ｌ程度含まれているのに対して、沈殿槽処理水には、平均値として溶解性マンガン（Ｄ−Ｍｎ）が０．０１ｍｇ／Ｌ、砂濾過処理水に至っては、溶解性マンガン（Ｄ−Ｍｎ）が平均値として０．０００７ｍｇ／Ｌしか含まれておらず、微量金属酸化微生物の働きにより、溶解性マンガンを含む藻類の増殖に必要な微量金属が、藻類が摂取することができる状態で処理水中に殆ど存在しなくなったため、藻類の増殖が抑えられたのではないかと考えている。 However, the inventors of the present application have an average value of about 0.045 mg / L of soluble manganese (D-Mn) in the sewage treated water, whereas the average value is in the precipitation tank treated water. As the soluble manganese (D-Mn) reaches 0.01 mg / L, the sand filtration treated water contains only 0.0007 mg / L of soluble manganese (D-Mn) as an average value. Because of the action of oxidizing microorganisms, trace metals necessary for the growth of algae containing soluble manganese are almost absent in the treated water in a state where the algae can ingest, so the growth of algae may have been suppressed. thinking.
（効果確認実験２）
次に、エストロゲン分解効果を確認するために、下水処理水と沈殿槽処理水中のエストロン濃度を測定した。図８は、エストロン濃度を累積頻度分布で示すグラフである。グラフから明らかなように、エストロゲン分解微生物の働きによりエストロゲンの１種であるエストロンが低下していることが認められる。この結果は、英国における魚類雌性化抑制のための下水処理に係わる環境水質目標値（エストロン：３ｎｇ／Ｌ）（下水処理水が河川に放流され、河川水で希釈された後の環境水の目標値）をほぼ満足している。このことから、本発明の下水処理水の藻類増殖抑制方法により処理した処理水における魚類等の雌性化影響は、略抑止されるものと考えられる。
(Effect confirmation experiment 2)
Next, in order to confirm the estrogen decomposition effect, the estrone concentration in the sewage treated water and the settling tank treated water was measured. FIG. 8 is a graph showing the estrone concentration as a cumulative frequency distribution. As is apparent from the graph, it is recognized that estrone, which is a kind of estrogen, is lowered by the action of estrogen-degrading microorganisms. This result shows the target value of environmental water quality (estrone: 3 ng / L) related to sewage treatment to reduce the feminization of fish in the UK (target of environmental water after sewage treatment water is discharged into the river and diluted with river water. Value). From this, it is considered that the feminization effect of fish and the like in the treated water treated by the method for inhibiting algal growth of sewage treated water of the present invention is substantially suppressed.
以上のように、この発明の実施の形態を説明してきたが、あくまでも一例を示すものであり、下水処理施設、生物反応槽、沈殿槽、砂濾過装置、膜分離装置等は、従来技術と置換可能である。その場合であっても、前記効果を奏することは明らかである。また、図面で示した各構成の形状や材質等は、あくまでも好ましい一例を示すものであり、その実施に際しては特許請求の範囲に記載した範囲内で、任意に設計変更・修正ができるものである。なお、藻類とは、主に水中に生息する光合成生物（植物）の総称であり、海藻類や植物プランクトンなどを含む意味で使用している。この海藻類は、アオノリなどの緑藻類、コンブやワカメなどの褐藻類、アサクサノリなどの紅藻類といったそれぞれ色も形も生活様式も異なる３群を含み、植物プランクトンは、渦鞭毛藻類や珪藻類，ミドリムシ類などを含んでいる。 As described above, the embodiment of the present invention has been described. However, the embodiment is merely an example, and a sewage treatment facility, a biological reaction tank, a sedimentation tank, a sand filtration apparatus, a membrane separation apparatus, and the like are replaced with conventional techniques. Is possible. Even in such a case, it is clear that the above-described effect is achieved. In addition, the shape, material, and the like of each configuration shown in the drawings are merely preferable examples, and can be arbitrarily changed and modified within the scope described in the claims in the implementation. . Algae is a general term for photosynthetic organisms (plants) that mainly live in water, and is used to include seaweeds and phytoplankton. This seaweed includes three groups with different colors, shapes, and lifestyles, such as green algae such as aonori, brown algae such as kombu and wakame, and red algae such as sea cucumber. It includes the kind.
２ 生物反応槽
２０ タンク（反応槽本体）
２１ 散気板（曝気手段）
２３ スクリーン
３ 沈殿槽（浮遊物質除去装置）
３’ 砂濾過装置（濾過装置、浮遊物質除去装置）
３” 膜分離装置（濾過装置、浮遊物質除去装置）
Ｓ 微生物保持担体
2 Biological reaction tank 20 tank (reaction tank body)
21 Air diffuser (aeration means)
23 Screen 3 Settling tank (Floating substance removal device)
3 'Sand filtration device (filtration device, suspended solids removal device)
3 "membrane separator (filtration device, suspended solids removal device)
S Microbe holding carrier
Claims (10)
前記生物反応槽通過後の処理水から前記微量金属の酸化物を除去する微量金属酸化物除去工程と、を備えることを特徴とする下水処理水の藻類増殖抑制方法。 The sewage treated water whose organic substance concentration is reduced by purifying the sewage is passed through a biological reaction tank containing a microorganism-supporting carrier capable of supporting microorganisms, and air is sent from the bottom in this biological reaction tank. The trace metal oxidation microorganisms that oxidize trace metals necessary for the growth of algae are spontaneously supported on the surface of the microorganism holding carrier, and the trace metal oxidation microorganisms allow the sewage treated water to be aerated. A trace metal oxidation step of oxidizing and insolubilizing the trace metal contained in
A method for inhibiting algal growth of sewage treated water, comprising: removing a trace metal oxide from the treated water after passing through the biological reaction tank.
空気を送り込んで曝気する曝気手段を有し、微生物を担持可能な微生物保持担体を収容する生物反応槽と、この生物反応槽の下流に配置され、前記生物反応槽で生物処理を施した反応槽処理水中に含まれる浮遊物質を除去する浮遊物質除去装置とを備え、前記微生物保持担体は、藻類の増殖に必要な微量金属を酸化する微量金属酸化微生物を担持することを特徴とする下水処理水の藻類増殖抑制装置。 A device that reduces the potential of algae growth for sewage treated water that has been purified by treating the sewage to reduce the concentration of organic matter,
A bioreactor having aeration means for sending air and aerating and containing a microorganism holding carrier capable of supporting microorganisms, and a reaction tank disposed downstream of the bioreactor and subjected to biological treatment in the bioreactor A sewage treated water comprising: a suspended matter removing device for removing suspended matter contained in treated water, wherein the microorganism holding carrier carries a trace metal oxidizing microorganism that oxidizes trace metals necessary for algae growth. Algae growth suppression device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008052898A JP5176182B2 (en) | 2008-03-04 | 2008-03-04 | Algae growth suppression method and apparatus for treated sewage water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008052898A JP5176182B2 (en) | 2008-03-04 | 2008-03-04 | Algae growth suppression method and apparatus for treated sewage water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009207985A true JP2009207985A (en) | 2009-09-17 |
| JP5176182B2 JP5176182B2 (en) | 2013-04-03 |
Family
ID=41181660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008052898A Active JP5176182B2 (en) | 2008-03-04 | 2008-03-04 | Algae growth suppression method and apparatus for treated sewage water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5176182B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06496A (en) * | 1992-06-23 | 1994-01-11 | Nippon Steel Corp | Advanced treatment of sewage |
| JPH0852481A (en) * | 1994-08-12 | 1996-02-27 | Meidensha Corp | Method for measuring chromaticity in sewage or waste water treatment and instrument therefor |
| JP2000202481A (en) * | 1999-01-12 | 2000-07-25 | Kurita Water Ind Ltd | Toc component removing device at ultrapure water production device |
| JP2003290784A (en) * | 2002-04-02 | 2003-10-14 | Kaihatsu Kogyo:Kk | Iron and manganese remover and method for the same |
| JP2005254205A (en) * | 2004-03-15 | 2005-09-22 | Ebara Corp | Method and apparatus for treating female hormone in sewage |
-
2008
- 2008-03-04 JP JP2008052898A patent/JP5176182B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06496A (en) * | 1992-06-23 | 1994-01-11 | Nippon Steel Corp | Advanced treatment of sewage |
| JPH0852481A (en) * | 1994-08-12 | 1996-02-27 | Meidensha Corp | Method for measuring chromaticity in sewage or waste water treatment and instrument therefor |
| JP2000202481A (en) * | 1999-01-12 | 2000-07-25 | Kurita Water Ind Ltd | Toc component removing device at ultrapure water production device |
| JP2003290784A (en) * | 2002-04-02 | 2003-10-14 | Kaihatsu Kogyo:Kk | Iron and manganese remover and method for the same |
| JP2005254205A (en) * | 2004-03-15 | 2005-09-22 | Ebara Corp | Method and apparatus for treating female hormone in sewage |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5176182B2 (en) | 2013-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Hazardous substances and their removal in recirculating aquaculture systems: A review | |
| US8192626B2 (en) | Wastewater chemical/biological treatment method for open water discharge | |
| US7153423B2 (en) | Wastewater treatment | |
| CN204848595U (en) | Effluent disposal system breeds | |
| KR100784933B1 (en) | Apparatus for treating organic matter and nitrogen of high density organic wastewater | |
| CN109592840A (en) | A kind of School Wastewater processing unit | |
| US20120325740A1 (en) | Organism metabolites for removal of pollutants from brine | |
| KR20170022051A (en) | Recirculating aquaculture system | |
| CN109095714A (en) | A kind of good anaerobism alternative expression sewage purifier and purification process | |
| KR101594822B1 (en) | The method and processing apparatus of the floating fish cage sludge using biological activated carbon | |
| CA2921872C (en) | Multi-step system for treating selenium-containing wastewater | |
| US20140346125A1 (en) | Desalting Salty Sludge System and Method | |
| JP2008023468A (en) | Dominating treatment apparatus and method of bacillus bacteria | |
| JPS63236596A (en) | Treatment of waste water with activated sludge | |
| JP2006314991A (en) | Apparatus and method for treating high-concentration nitrogen-containing dirty waste water such as waste water from livestock farmer and excreta | |
| KR101278475B1 (en) | Sludge Treatment Facility Combining Swirl Flow Type Inorganic Sludge Selective Discharge Device and Bioreactor | |
| CN106277602A (en) | The Treated sewage reusing processing system of industrial wastewater and method | |
| JP3797296B2 (en) | Purification method of bottom sludge | |
| JP5176182B2 (en) | Algae growth suppression method and apparatus for treated sewage water | |
| CN103508629A (en) | Wastewater treatment system for food industry | |
| KR20180013257A (en) | Apparatus of advanced wastewater treatment | |
| CN112794529A (en) | Combined sewage treatment process | |
| CN101798158A (en) | Advanced treatment method of refractory organic industrial sewage | |
| JP2004097926A (en) | Water treatment method and water treatment equipment | |
| CN109502892A (en) | A kind of sewage treatment process and its sewage disposal system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20110303 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20111118 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20111129 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20120127 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20121016 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20121112 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20121204 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20121219 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5176182 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |