JP4276933B2 - Flock-forming agent, bulking prevention method and activated sludge treatment method - Google Patents
Flock-forming agent, bulking prevention method and activated sludge treatment method Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims description 65
- 239000003795 chemical substances by application Substances 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 29
- 230000002265 prevention Effects 0.000 title claims description 6
- 108010020346 Polyglutamic Acid Proteins 0.000 claims description 19
- 229920002643 polyglutamic acid Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 150000001767 cationic compounds Chemical class 0.000 claims description 7
- 125000003277 amino group Chemical group 0.000 claims description 4
- 229920002873 Polyethylenimine Polymers 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims 1
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- 238000002474 experimental method Methods 0.000 description 20
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- 239000002351 wastewater Substances 0.000 description 6
- 229960002989 glutamic acid Drugs 0.000 description 5
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000004220 glutamic acid Substances 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 230000004931 aggregating effect Effects 0.000 description 2
- 239000004067 bulking agent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 235000013922 glutamic acid Nutrition 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 235000013557 nattō Nutrition 0.000 description 2
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- 241000193830 Bacillus <bacterium> Species 0.000 description 1
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- WHUUTDBJXJRKMK-GSVOUGTGSA-N D-glutamic acid Chemical compound OC(=O)[C@H](N)CCC(O)=O WHUUTDBJXJRKMK-GSVOUGTGSA-N 0.000 description 1
- 229930182847 D-glutamic acid Natural products 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000244206 Nematoda Species 0.000 description 1
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- 229910021536 Zeolite Inorganic materials 0.000 description 1
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- 229920006317 cationic polymer Polymers 0.000 description 1
- OGEBRHQLRGFBNV-RZDIXWSQSA-N chembl2036808 Chemical class C12=NC(NCCCC)=NC=C2C(C=2C=CC(F)=CC=2)=NN1C[C@H]1CC[C@H](N)CC1 OGEBRHQLRGFBNV-RZDIXWSQSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 244000144972 livestock Species 0.000 description 1
- JWZXKXIUSSIAMR-UHFFFAOYSA-N methylene bis(thiocyanate) Chemical compound N#CSCSC#N JWZXKXIUSSIAMR-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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Classifications
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- 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
Description
本発明は、微生物フロックの形成を促進するフロック形成剤と、該フロック形成剤を用いたバルキング予防方法及び活性汚泥処理方法に関する。 The present invention relates to a floc forming agent that promotes the formation of microbial flocs, a bulking prevention method and an activated sludge treatment method using the floc forming agent.
有機性排水の生物酸化処理方法である活性汚泥法が知られている。この活性汚泥法は、細菌、かび類、藻類、原生動物、輪虫類、線虫類等の好気性微生物の集合体である「活性汚泥」を利用して排水を浄化する方法であり、現在、下水処理、産業排水処理、畜産汚水処理等に広く利用されている。 An activated sludge method, which is a biological oxidation treatment method for organic wastewater, is known. This activated sludge method is a method of purifying wastewater using “activated sludge”, which is an aggregate of aerobic microorganisms such as bacteria, fungi, algae, protozoa, rotifers, nematodes, etc. It is widely used for sewage treatment, industrial wastewater treatment, livestock sewage treatment, etc.
この活性汚泥法のプロセスは、概ね、次の通りである。まず、濾過、沈殿等の前処理を行った排水を、生物反応槽（曝気槽）に送り込み、曝気しながらフロック状の活性汚泥と接触させ、この過程で排水中に含まれている有機物を好気的に酸化分解する。続いて、処理水を沈殿槽（沈殿池）に送って汚泥を分離・沈殿（固液分離）させた後に、その分離上層水を消毒し、放流する。そして、前記沈殿槽で発生した濃縮活性汚泥の一部を返送汚泥として前記生物反応槽に送って、該反応槽内の汚泥の微生物濃度の調製に用いるとともに、新しい流入排水（流入基質）と接触させる。 The process of this activated sludge method is generally as follows. First, wastewater that has undergone pretreatment such as filtration and precipitation is sent to a biological reaction tank (aeration tank) and brought into contact with floc-like activated sludge while aerated, and organic substances contained in the wastewater are preferred during this process. It decomposes oxidatively. Subsequently, the treated water is sent to a sedimentation tank (sedimentation basin) to separate and settle sludge (solid-liquid separation), and then the separated upper layer water is disinfected and discharged. Then, a part of the concentrated activated sludge generated in the sedimentation tank is sent to the biological reaction tank as a return sludge and used for the preparation of the microbial concentration of the sludge in the reaction tank, and in contact with a new influent wastewater (inflow substrate) Let
フロック状の微生物集合体である前記活性汚泥は、有機物酸化力と凝集吸着力が強く、沈降分離性に優れているが、一旦生物反応槽で「バルキング」と称される現象が発生すると、活性汚泥が膨れて軽くなるため、沈降性と圧密性が悪化し、沈殿槽での分離上層水の量が減少悪くなる等の問題が起こる。 The activated sludge, which is a floc-like microorganism aggregate, has strong organic matter oxidizing power and cohesive adsorption power, and is excellent in sedimentation separation. However, once a phenomenon called “bulking” occurs in a biological reaction tank, it becomes active. Since the sludge is swollen and lightened, sedimentation and compaction are deteriorated, and problems such as a decrease in the amount of separated upper layer water in the sedimentation tank occur.
前記バルキングは、活性汚泥中に糸状体を形成する微生物（糸状性細菌）が増殖した場合（糸状性バルキング）や活性汚泥中に高粘性多糖類のような物質が蓄積した場合（非糸状性バルキング）等に発生する。その発生原因として、水温の変化、炭水化物を多量に含む排水の流入、低分子の溶解性有機物の多量流入、ＳＳ流入量の低下、窒素及びリンの不足等が知られている。 The bulking is performed when microorganisms (filamentous bacteria) that form filaments in activated sludge grow (filamentous bulking) or when substances such as highly viscous polysaccharides accumulate in activated sludge (non-filamentous bulking). ) Etc. As the cause of the occurrence, changes in water temperature, inflow of wastewater containing a large amount of carbohydrates, inflow of a large amount of low-molecular soluble organic matter, decrease in inflow of SS, lack of nitrogen and phosphorus, and the like are known.
一般的なバルキング対策としては、凝集剤の添加によって汚泥の沈降性の改善を行う方法、殺菌剤添加による糸状性細菌の殺菌を行う方法、糸状性細菌の糸状化抑制を行う方法等が採用されている。 As a general countermeasure against bulking, a method of improving the sedimentation property of sludge by adding a flocculant, a method of sterilizing filamentous bacteria by adding a bactericide, a method of suppressing filamentation of filamentous bacteria, etc. are adopted. ing.
例えば、特許文献１には、カチオン系高分子凝集剤、無機凝集剤等を含有するバルキング防除剤が開示され、これを曝気槽、沈殿槽、返送汚泥に添加するバルキング防除方法が開示されている。特許文献２には、メチレンジチオシアネートを有効性成分として含有し、該有効成分によって特定の糸状性細菌を破壊することを特徴とするバルキング現象防止剤が開示されている。特許文献３には、ピラゾロピリミジン誘導体によって、糸状性細菌の糸状化のみを抑制するバルキング防止剤が開示されている。加えて、特許文献４には、天然原料から製造されたゼオライトを主成分とするバルキング防止剤が開示されている。
しかしながら、活性汚泥槽等に凝集剤や殺菌剤の添加を行って、バルキングを防止又は抑制を図る方法では、微生物活性が低下するという技術的課題がある。また、従来のバルキング防止剤では、微生物のフロック形成の促進を充分に行うことができなかった。 However, a method for preventing or suppressing bulking by adding a flocculant or a disinfectant to an activated sludge tank or the like has a technical problem that microbial activity is reduced. In addition, the conventional bulking inhibitor cannot sufficiently promote the formation of microbial flocs.
そこで、本発明は、微生物活性を低下させることなく、フロック形成を促進できるフロック形成剤を提供するとともに、該フロック形成剤を用いるバルキング予防方法と活性汚泥処理方法を提供することを主な目的とする。 Accordingly, the present invention mainly provides a floc forming agent capable of promoting floc formation without reducing microbial activity, and a bulking prevention method and an activated sludge treatment method using the floc forming agent. To do.
上記課題を解決するため、本発明では、網目状構造を有するポリグルタミン酸（Poly-γ-Glutamic Acid）架橋樹脂と、架橋樹脂のカルボキシル基（−ＣＯＯＨ）に結合するカチオン性化合物と、から構成されたフロック形成剤を提供する。 In order to solve the above problems, the present invention comprises a polyglutamic acid (Poly-γ-Glutamic Acid) crosslinked resin having a network structure and a cationic compound that binds to a carboxyl group (—COOH) of the crosslinked resin. Providing a flocculant.
Ａ．ポリグルタミン酸架橋樹脂について。 A. About polyglutamic acid crosslinked resin.
ポリグルタミン酸（Poly-γ-Glutamic Acid）は、Ｄ−グルタミン酸とＬ−グルタミン酸が混在したアミノマー（高分子体）で、例えば、納豆のネバ成分もこのアミノマーのひとつである。本発明に係るポリグルタミン酸架橋樹脂は、このポリグルタミン酸が網目状に結合したものである。 Polyglutamic acid (Poly-γ-Glutamic Acid) is an aminomer (polymer) in which D-glutamic acid and L-glutamic acid are mixed. For example, the Neva component of natto is one of these aminomers. The polyglutamic acid cross-linked resin according to the present invention is obtained by binding the polyglutamic acid in a network.
グルタミン酸はアミノ酸の一種で、側鎖にカルボキシル基（−ＣＯＯＨ）を含む。従って、ポリグルタミン酸架橋樹脂も、網目状構造の中に、多数のカルボキシル基を含む。カルボキシル基は、液体中では負に荷電（−ＣＯＯ−）している。 Glutamic acid is a kind of amino acid and contains a carboxyl group (—COOH) in the side chain. Therefore, the polyglutamic acid cross-linked resin also contains a large number of carboxyl groups in the network structure. The carboxyl group is negatively charged (—COO − ) in the liquid.
ポリグルタミン酸架橋樹脂の網目状構造は、微生物の支持体として機能する。この網目状構造は、微生物を高密度に定着・凝集させることに適している。 The network structure of the polyglutamic acid cross-linked resin functions as a microbial support. This network structure is suitable for fixing and aggregating microorganisms at high density.
ポリグルタミン酸架橋樹脂は、例えば、以下の方法で製造することができる。（１）Ｂａｃｉｌｌｕｓ属細菌（納豆菌種）を、グルタミン酸を添加して培養して、ポリグルタミン酸を作製する。（２）作製したポリグルタミン酸にγ線を照射し、網目状に架橋させ、ポリグルタミン酸架橋樹脂を作製する。 The polyglutamic acid crosslinked resin can be produced, for example, by the following method. (1) Bacillus genus bacteria (natto species) are added with glutamic acid and cultured to produce polyglutamic acid. (2) The produced polyglutamic acid is irradiated with γ-rays and crosslinked in a network form to produce a polyglutamic acid crosslinked resin.
Ｂ．カチオン性化合物について。 B. About cationic compounds.
前記ポリグルタミン酸架橋樹脂は、多数のカルボキシル基を含むため、負に荷電（−ＣＯＯ−）している。一方、微生物も負に荷電している。そのため、ポリグルタミン酸架橋樹脂のみでは、微生物が高効率に定着しにくく、また、微生物活性を弱めてしまうという欠点があった。そこで、本発明では、ポリグルタミン酸架橋樹脂のカルボキシル基にカチオン性化合物を結合させた。 Since the polyglutamic acid cross-linked resin contains a number of carboxyl groups, it is negatively charged (—COO − ). On the other hand, microorganisms are also negatively charged. Therefore, the polyglutamic acid cross-linked resin alone has the disadvantages that microorganisms are difficult to settle with high efficiency and that the microbial activity is weakened. Therefore, in the present invention, a cationic compound is bonded to the carboxyl group of the polyglutamic acid crosslinked resin.
カチオン性化合物をポリグルタミン酸架橋樹脂に結合させることには、以下の利点がある。（１）フロック形成剤の網目状部分が正に荷電する。これにより、フロック形成剤と微生物との親和性が増すため、微生物を高密度に定着・凝集させることができる。そのため、微生物フロックの形成を促進することができる。（２）微生物を高密度に凝集させることができるため、バルキングの発生を予防できる。（３）フロック形成に際して、薬剤による凝集・殺菌等を行っていないため、微生物活性を弱めない。 Binding the cationic compound to the polyglutamic acid crosslinked resin has the following advantages. (1) The mesh portion of the floc forming agent is positively charged. As a result, the affinity between the floc-forming agent and the microorganism increases, so that the microorganism can be fixed and aggregated at a high density. Therefore, formation of microbial floc can be promoted. (2) Since microorganisms can be aggregated with high density, the occurrence of bulking can be prevented. (3) Since flocs are not agglomerated or sterilized by chemicals during flocculation, microbial activity is not weakened.
カチオン性化合物は、ポリグルタミン酸架橋樹脂のカルボキシル基と結合するもの、例えば、アミノ基を有する化合物を用いることができる。特に、ポリエチレンイミンは、一端のアミノ基はポリグルタミン酸架橋樹脂のカルボキシル基と結合し、他のアミノ基は正に荷電して微生物と親和することができるので、好適である。 As the cationic compound, one that binds to the carboxyl group of the polyglutamic acid cross-linked resin, for example, a compound having an amino group can be used. In particular, polyethyleneimine is preferable because the amino group at one end is bonded to the carboxyl group of the polyglutamic acid cross-linked resin, and the other amino group can be positively charged to be compatible with microorganisms.
Ｃ．本発明に係るフロック形成剤の利用について C. Use of floc forming agent according to the present invention
このフロック形成剤は、活性汚泥法を利用した水処理設備等に利用できる。例えば、水処理施設の曝気槽、沈殿槽、硝化槽、脱窒槽、返送汚泥等に添加して用いる。このフロック形成剤を水処理設備等に添加することには、以下の利点がある。（１）微生物フロックの形成を促進し、微生物を凝集するため、水処理能力（有機物酸化力）を高くできる。（２）微生物がフロック形成剤に定着・凝集するため、バルキングを予防できる。（３）新たな設備の設置、既存の設備の交換等を行わずに、水処理を高効率化することができる。 This floc-forming agent can be used for water treatment facilities using an activated sludge method. For example, it is used by adding to an aeration tank, settling tank, nitrification tank, denitrification tank, return sludge, etc. of a water treatment facility. The addition of this floc-forming agent to water treatment facilities has the following advantages. (1) Since the formation of microbial flocs is promoted and the microorganisms are aggregated, the water treatment capacity (organic matter oxidizing power) can be increased. (2) Since microorganisms settle and aggregate on the floc forming agent, bulking can be prevented. (3) Water treatment can be made highly efficient without installing new equipment or replacing existing equipment.
このフロック形成剤は、微生物を高密度に定着・凝集することができる。そのため、微生物フロックの形成を促進することができる。 This floc forming agent can fix and agglomerate microorganisms at high density. Therefore, formation of microbial floc can be promoted.
このフロック形成剤は、活性汚泥を定着・保持できる。そのため、水処理工程で、処理水の流れによって活性汚泥が流されることによる、活性汚泥のロスを防止できる。このことにより、活性汚泥の補充回数を少なくすることができ、また、活性汚泥を長持ちさせる効果がある。 This floc forming agent can fix and retain activated sludge. Therefore, the loss of activated sludge due to the activated sludge being flowed by the flow of treated water in the water treatment step can be prevented. As a result, the number of times the activated sludge is replenished can be reduced, and the activated sludge can be lasted for a long time.
このフロック形成剤は、バルキング予防効果がある。 This flocculant has a bulking preventive effect.
このフロック形成剤は、簡易、低コストに利用できる。 This floc forming agent can be used simply and at low cost.
実施例１は、活性汚泥装置の曝気槽に、活性汚泥を添加又は補充する場合を想定して行った実験である。実験手順は以下のとおりである。 Example 1 is an experiment conducted assuming that activated sludge is added to or supplemented to the aeration tank of the activated sludge apparatus. The experimental procedure is as follows.
まず、曝気槽を想定した容積１．５Ｌの角槽を準備した。その角槽内を活性汚泥混合液で満たし、球形のエアストーンを角槽内に設置して曝気できるようにした。 First, a square tank having a volume of 1.5 L assuming an aeration tank was prepared. The inside of the square tank was filled with the activated sludge mixed liquid, and a spherical air stone was installed in the square tank so that it could be aerated.
次に、角槽内を曝気している状態で、本発明に係るフロック形成剤を１５ｍＬ添加した。同剤を添加後、活性汚泥混合液を６．２５ｍＬ／ｍｉｎの流量で連続添加（滞留時間４時間）し、同時に本発明に係るフロック形成剤を０．６２５ｍＬ／ｍｉｎの流量（活性汚泥混合液の１／１０の頻度）で連続添加した。１６時間後連続添加を停止し、角槽内の汚泥のＳＶ３０、ＭＬＳＳ、ＳＶＩを測定した。また、上記実験と同時に、本発明に係るフロック形成剤を添加せずに、同じ実験手順で対照実験を行った。 Next, 15 mL of the floc forming agent according to the present invention was added while the inside of the square tank was aerated. After the same agent is added, the activated sludge mixed solution is continuously added at a flow rate of 6.25 mL / min (residence time 4 hours), and at the same time, the floc forming agent according to the present invention is flowed at a flow rate of 0.625 mL / min (activated sludge mixed solution). 1/10 of the frequency). After 16 hours, the continuous addition was stopped, and SV30, MLSS, and SVI of the sludge in the square tank were measured. Simultaneously with the above experiment, a control experiment was performed in the same experimental procedure without adding the floc forming agent according to the present invention.
なお、実験で用いたフロック形成剤は、ポリグルタミン酸１６０ｍｇ／Ｌ、ポリエチレンイミン８００００ｍｇ／Ｌのものを用いた。 The floc forming agent used in the experiment was polyglutamic acid 160 mg / L and polyethyleneimine 80000 mg / L.
結果を表１に示す。
ＳＶ３０は、３０分静置後の活性汚泥沈殿率を示したもので、汚泥の量の指標となる。ＭＬＳＳ（活性汚泥浮遊物質）は、活性汚泥槽の汚泥量を表す値であり、２０００ｍｇ／Ｌ以上の値が必要となる。この実験では、ＳＶ３０は、両方ともほぼ１００％になったのに対して、ＭＬＳＳは、フロック形成剤を添加したほうが対照実験の２倍以上の値になった。このことは、フロック形成剤によって、活性汚泥が高密度に凝集されたことを示している。従って、本発明に係るフロック形成剤が微生物フロックの形成を促進することが本実験により示された。 SV30 indicates the activated sludge sedimentation rate after standing for 30 minutes and serves as an index of the amount of sludge. MLSS (activated sludge suspended matter) is a value representing the amount of sludge in the activated sludge tank, and a value of 2000 mg / L or more is required. In this experiment, both SV30 were almost 100%, while MLSS was more than twice as high as the control experiment when the flocculant was added. This indicates that the activated sludge is aggregated at a high density by the floc forming agent. Therefore, this experiment showed that the flocculant according to the present invention promotes the formation of microbial flocs.
また、前記のとおり、ＭＬＳＳは、対照実験の２倍以上の値になった。この結果は、このフロック形成剤には、活性汚泥の濃度を高める効果があることを示している。従って、本発明に係るフロック形成剤によって、活性汚泥装置の曝気槽に高効率に活性汚泥を添加又は補充できることが本実験により示された。 In addition, as described above, MLSS was more than twice that of the control experiment. This result shows that this floc forming agent has an effect of increasing the concentration of activated sludge. Therefore, it was shown by this experiment that the activated sludge can be added or supplemented with high efficiency to the aeration tank of the activated sludge apparatus by the floc forming agent according to the present invention.
ＳＶＩ（汚泥容量指数）は、活性汚泥の沈降性を示す指標で、通常の曝気槽では５０〜１５０が適切な値である。ＳＶＩが２００以上の場合、バルキングしている状態である。本実験の結果は、表１に示すとおりである。本発明に係るフロック形成剤を添加することにより、ＳＶＩは対照実験の１／２程度に下がった。この結果は、このフロック形成剤にはバルキング予防効果があることを示している。 SVI (sludge capacity index) is an index indicating the sedimentation property of activated sludge, and 50 to 150 is an appropriate value in a normal aeration tank. When SVI is 200 or more, it is in a bulking state. The results of this experiment are as shown in Table 1. By adding the flocculant according to the present invention, the SVI decreased to about ½ of the control experiment. This result indicates that this flocculant has a bulking preventive effect.
実施例２は、活性汚泥装置の曝気槽に活性汚泥を添加又は補充した後、実際に水処理を行った場合を想定して行った実験である。実験手順は以下のとおりである。 Example 2 is an experiment conducted assuming that water treatment is actually performed after adding or supplementing activated sludge to the aeration tank of the activated sludge apparatus. The experimental procedure is as follows.
実施例１の角槽内の活性汚泥混合液（活性汚泥とフロック形成剤を連続添加したのちの活性汚泥混合液）の一部を、５００ｍＬビーカーに流し込み、球形のエアストーンをビーカー内に設置して曝気できるようにした。 A part of the activated sludge mixed liquid (the activated sludge mixed liquid after the activated sludge and the floc forming agent are continuously added) in the square tank of Example 1 is poured into a 500 mL beaker, and a spherical air stone is installed in the beaker. I was able to aerate.
次に、ビーカー内を曝気している状態で、水を６．２５ｍＬ／ｍｉｎの流量で連続添加した。水を４時間連続添加した後、連続添加を停止し、ＳＶ３０、ＳＶ１２０、ＭＬＳＳを測定した。また、上記実験と同時に、実施例１の対照実験における活性汚泥混合液についても、同様の手順で実験を行った。 Next, water was continuously added at a flow rate of 6.25 mL / min while the beaker was aerated. After continuous addition of water for 4 hours, continuous addition was stopped and SV30, SV120, and MLSS were measured. At the same time as the above experiment, the activated sludge mixed liquid in the control experiment of Example 1 was also tested in the same procedure.
結果を表２に示す。
ＳＶ３０は３０分後の活性汚泥沈殿率を、ＳＶ１２０は１２０分後の活性汚泥沈殿率を表している。表２に示すとおり、フロック形成剤を添加したほうは、３０分後の値は５０％であり、１２０分後でも２５％であり、対照実験よりも高い値を維持している。このことは、フロック形成剤に、活性汚泥を長期間保持・固定する機能があることを示している。 SV30 represents the activated sludge sedimentation rate after 30 minutes, and SV120 represents the activated sludge sedimentation rate after 120 minutes. As shown in Table 2, when the flocculant was added, the value after 30 minutes was 50%, and even after 120 minutes, it was 25%, which is higher than the control experiment. This indicates that the floc forming agent has a function of holding and fixing activated sludge for a long period of time.
また、フロック形成剤を用いたもののＭＬＳＳ（活性汚泥浮遊物質）は、対照実験と比較して、３倍以上の値となった。長時間の水処理の後において、対照実験では、汚泥量が８５０ｍｇ／ｌまで少なくなっているのに対し、フロック形成剤を用いたものは、３倍以上の汚泥量を保持している。この結果は、本発明に係るフロック形成剤が、活性汚泥装置による水処理を行った場合にも、活性汚泥を保持する担体として有効に機能していることを示している。従って、本発明に係るフロック形成剤は、活性汚泥を曝気槽等に定着・保持させる方法として、有効である。 Moreover, MLSS (activated sludge suspended solids) using a floc forming agent was three times or more compared to the control experiment. After a long water treatment, in the control experiment, the amount of sludge decreased to 850 mg / l, while those using a flock-forming agent retained a sludge amount three times or more. This result shows that the floc-forming agent according to the present invention functions effectively as a carrier for holding activated sludge even when water treatment is performed by the activated sludge apparatus. Therefore, the floc forming agent according to the present invention is effective as a method for fixing and holding activated sludge in an aeration tank or the like.
活性汚泥法は、水浄化方法として広く用いられている。本発明に係るフロック形成剤は、活性汚泥を凝集・保持する担体として有効であり、特に、活性汚泥法を用いた水処理施設、水処理装置に適用できる。従って、産業上の利用可能性がある。 The activated sludge method is widely used as a water purification method. The floc forming agent according to the present invention is effective as a carrier for aggregating and holding activated sludge, and is particularly applicable to water treatment facilities and water treatment apparatuses using the activated sludge method. Therefore, there is industrial applicability.
活性汚泥法には、「バルキング」発生しやすいという欠点がある。本発明に係るフロック形成剤は、バルキング予防・防止機能を持つため、産業上有用である。 The activated sludge method has a drawback that “bulking” is likely to occur. Since the floc forming agent according to the present invention has a bulking prevention / prevention function, it is industrially useful.
本発明に係るフロック形成剤は、新たな設備の設置や既存設備の改造等をせずに導入できる。そのため、簡易、低コストに、活性汚泥法を用いた既存の水処理施設、水処理装置に適用できる点で、産業上有用である。 The floc forming agent according to the present invention can be introduced without installing new equipment or modifying existing equipment. Therefore, it is industrially useful in that it can be applied to existing water treatment facilities and water treatment apparatuses using the activated sludge method in a simple and low cost manner.
Claims (4)
アミノ基を有し、前記架橋樹脂のカルボキシル基（−ＣＯＯＨ）に結合するカチオン性化合物と、
から構成されたフロック形成剤。 A poly-glutamic acid crosslinked resin having a network structure;
A cationic compound having an amino group and binding to a carboxyl group (—COOH) of the crosslinked resin;
A floc-forming agent composed of
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