JP4065743B2 - Treatment method of organic wastewater - Google Patents
Treatment method of organic wastewater Download PDFInfo
- Publication number
- JP4065743B2 JP4065743B2 JP2002242871A JP2002242871A JP4065743B2 JP 4065743 B2 JP4065743 B2 JP 4065743B2 JP 2002242871 A JP2002242871 A JP 2002242871A JP 2002242871 A JP2002242871 A JP 2002242871A JP 4065743 B2 JP4065743 B2 JP 4065743B2
- Authority
- JP
- Japan
- Prior art keywords
- wastewater
- organic matter
- treatment
- earth metal
- hydroxide
- 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.)
- Expired - Fee Related
Links
- 239000002351 wastewater Substances 0.000 title claims description 59
- 238000000034 method Methods 0.000 title claims description 29
- 239000005416 organic matter Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 8
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 11
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-DYCDLGHISA-N deuterium hydrogen oxide Chemical compound [2H]O XLYOFNOQVPJJNP-DYCDLGHISA-N 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 241001148470 aerobic bacillus Species 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 150000004679 hydroxides Chemical class 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000589516 Pseudomonas Species 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- UHPMCKVQTMMPCG-UHFFFAOYSA-N 5,8-dihydroxy-2-methoxy-6-methyl-7-(2-oxopropyl)naphthalene-1,4-dione Chemical compound CC1=C(CC(C)=O)C(O)=C2C(=O)C(OC)=CC(=O)C2=C1O UHPMCKVQTMMPCG-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- 229920000936 Agarose Polymers 0.000 description 1
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000222120 Candida <Saccharomycetales> Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000193403 Clostridium Species 0.000 description 1
- 229920002307 Dextran Polymers 0.000 description 1
- 241000223218 Fusarium Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 241000316848 Rhodococcus <scale insect> Species 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 229940023476 agar Drugs 0.000 description 1
- 235000010419 agar Nutrition 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000679 carrageenan Substances 0.000 description 1
- 235000010418 carrageenan Nutrition 0.000 description 1
- 229920001525 carrageenan Polymers 0.000 description 1
- 229940113118 carrageenan Drugs 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005949 ozonolysis reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
Images
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)
- Activated Sludge Processes (AREA)
- Physical Water Treatments (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、有機物含有廃水の処理方法に関する。
【０００２】
【従来の技術およびその課題】
従来、塗装工場から排出される塗料廃水などの工業廃水、農業廃水など有機物を多く含む廃水は、凝集分離（浮上又は沈殿）処理を行なった後、好気下で生物処理するのが一般的であった。しかしながら、生物処理では微生物が有機物を分解する能力に限界があり、この手法で難分解性の有機物、例えば窒素を含む水溶性有機物質はそのまま処理水中に残存したり、処理できたとしても非常に長時間処理する必要があるなどの問題があった。
【０００３】
そこで、廃水中に含まれる難分解性の有機物を、微生物が分解しやすいような物質に変換するために、オゾン分解法、フェントン法、ＵＶ照射法など種々の方法が開発されてきた。例えば特開平８−１５５３０８号公報には、光酸化触媒の存在化で紫外線及び／又は可視光線を照射して有機物を含有する廃水を酸化分解する処理方法が開示されている。しかしながら、これらの方法では汚染物質を十分に分解することが困難であり、汚染物質濃度が上がったり、処理量が増大したりした場合に、分解されない物質が最終処理水中に残ってしまう危険があった。
【０００４】
本発明の目的は、廃水中に含まれる有機物を効率的に且つ十分に分解し得る有機物含有廃水の処理方法を提供することにある。
【０００５】
【課題を解決するための手段】
本発明者らは上記問題を解決するために鋭意研究した結果、有機物含有廃水にアルカリ土類金属の酸化物及び／又は水酸化物を添加し、該廃水中に含まれる有機物を十分に分解し得ることを見出し本発明を完成するに至った。
【０００６】
すなわち本発明は、有機物含有廃水を凝集分離処理した後、廃水中に含まれる有機物を、アルカリ土類金属の酸化物及び／又は水酸化物の存在下でマイクロ波の照射による加熱を行った後、生物処理を行って分解することを特徴とする有機物含有廃水の処理方法に関する。
【０００７】
【発明の実施の形態】
本発明において有機物含有廃水とは、工場や事業所から排出される工業廃水、農業廃水、生活排水などであり、特に塗料廃水を含む場合が挙げられる。該塗料廃水とは、例えば自動車などの塗装ライン、板金工場における塗装ブース水、塗料製造工場などから出る塗料成分を含んだ廃水や、各種工場における洗浄水などが挙げられる。
【０００８】
これらの廃水には、それぞれの種類に応じて各種顔料、染料、有機樹脂、架橋剤、有機溶剤、界面活性剤、油脂、及びその他の有機成分が含まれるが、その組成や含有量については、廃水の種類や発生源となる工場、あるいは発生する時間帯によっても変動し、一定ではない。例えば自動車の塗装ラインの廃水の一例を挙げると、沈殿物１〜１００ｇ／ｌ、ＣＯＤＭｎ１，０００〜１０，０００ｍｇ／ｌ、ＴＯＣ１，０００〜１５，０００ｍｇ／ｌ、ＢＯＤ１，０００〜５，０００ｍｇ／ｌ及び有機溶剤１〜１０，０００ｍｇ／ｌ程度であった。ここでＣＯＤＭｎは化学的酸素供給量を、ＴＯＣは全有機体炭素量を、またＢＯＤは生化学的酸素要求量を意味する。
【０００９】
上記有機物含有廃水のうち、固形物を多く含む廃水は、必要に応じて凝集剤の添加や電解処理等によって凝集分離処理されることが望ましい。該凝集分離処理は、本発明方法の前後工程の何処の工程であっても良いが、特に本発明では、前工程としてまず凝集分離処理を行ない、廃水から浮遊もしくは沈降分離する汚泥（スラッジ）、固形物を分離除去した処理水とし、該処理水を本発明方法に供することが望ましい。
【００１０】
凝集剤としては例えば、硫酸アルミニウム、ポリ塩化アルミニウム、塩化第二鉄等に代表される無機系凝集剤、界面活性剤等の低分子凝集剤、アニオン性、弱アニオン性、ノニオン性又はカチオン性の高分子凝集剤などを挙げることができ、廃水の種類に応じてこれらを単独で、あるいは複数種を組合せて用いることができる。
【００１１】
また、電解処理は、電極を廃水に入れて電流を流し、水の電気分解によって生じた酸素と水素の微細な気泡を用いて廃水中の顔料や樹脂等を吸着させ、気泡の浮力でそれらの物質を廃水表面に集める方法であり、凝集剤による処理と組み合わせても効果がある。電解処理は、通常、供給された廃水に電解質を投入・溶解し、その水槽内に複数の電極を適当な間隔に配置して、電極間に通電し電気分解を行なうものである。これによって廃水が凝集化するものである。電極としては、アルミ電極を、電解質としては硝酸ナトリウム、塩化ナトリウムなどを使用することが好適である。
【００１２】
本発明においては、上記の通り凝集物を沈降や濾過などにより取り除いた後、該凝集分離処理では取り除くことのできない、例えば親水性の有機溶剤、水溶性の有機樹脂などを、アルカリ土類金属の酸化物及び／又は水酸化物を用いて分解する。
【００１３】
本発明で用いるアルカリ土類金属の酸化物及び／又は水酸化物は、非水溶性であることが望ましく、アルカリ土類金属としては、カルシウムがコストや有機物分解能の面から特に好適である。アルカリ土類金属の酸化物は、水と反応して水酸化物となるが、その際発熱を伴い激しく反応するため、ハンドリング性、安定性の面からは水酸化物の方が望ましい。またアルカリ土類金属の酸化物及び／又は水酸化物として、アルカリ土類金属を含む複合金属酸化物及び／又は水酸化物を用いてもよい。
【００１４】
上記アルカリ土類金属の酸化物及び／又は水酸化物を用いた有機物含有廃水の分解は、該アルカリ土類金属の酸化物及び／又は水酸化物を廃水中に添加し、必要に応じて加熱しながら攪拌することによって行われる。処理終了後は、アルカリ土類金属の酸化物及び／又は水酸化物をろ過回収して再利用することができる。
【００１５】
アルカリ土類金属の酸化物及び／又は水酸化物の添加量は、廃水中に含まれる有機物の種類や濃度によって適宜選択され、通常は廃水に対して０．１〜５０重量％、好ましくは１〜２０重量％程度が好適である。該添加量が０．１重量％未満では、有機物を十分に分解するのが困難であり、一方５０重量％を越えると、処理槽内の十分な攪拌が困難となり、またコスト面でも不利となるので望ましくない。
【００１６】
上記処理では加熱によって有機物分解能をさらに高めることができる。加熱の手段としては、特にマイクロ波の照射が好適である。
【００１７】
マイクロ波は波長約０．１〜１，０００ｍｍの電磁波であり、ＵＨＦ（デシメートル波）、ＳＨＦ（センチメートル波）、ＥＨＦ（ミリメートル波）、サブミリ波が含まれる。国際的に工業用として割り当てられている２４５０ＭＨｚが用いられることが多いが、これに限定されるものではない。本発明に用いるマイクロ波は、電子レンジなどに用いられるマイクロ波発生装置を用いて作られ、必要に応じて凝集分離処理された塗料廃水に照射される。照射時間は廃水中の有機物の濃度、照射光の強さなどによって適宜選択できるが、照射時間は通常１分間〜６０分間程度が好ましい。
【００１８】
マイクロ波の照射によって廃水は発熱するが、一般に温度が高いほど有機物の分解の速度も上昇するため、廃水の沸騰や有機溶剤の揮散といった作業上の危険のない範囲では特に冷却の必要はない。また、分解効率を上げるためさらに加温してもよい。
【００１９】
本発明では、またアルカリ土類金属の酸化物及び／又は水酸化物による処理の前後工程の何処において、必要に応じて、生物処理を行なうことができる。特に上記アルカリ土類金属の酸化物及び／又は水酸化物による処理後、さらに廃水中の有機物量を低減する必要がある場合、生物処理を行うことが好適である。
【００２０】
生物処理方法としては従来から公知の方法、例えば活性汚泥法や担体投入型生物処理法などを用いて行うことができ、特に微生物固定化担体を用いた後者の生物処理が好適である。
【００２１】
上記担体投入型生物処理法は、有機又は無機の担体を用いるものであり、該担体に微生物を担持させ、この微生物により、廃水中の有機物を分解させるもので活性汚泥法より効率がよい。有機担体の材質としては、例えば、光硬化性樹脂、ポリウレタン、ポリビニルアルコール、ポリエチレン、ポリアクリルアミド、ポリエステル、ポリプロピレン、寒天、アルギン酸、カラギーナン、セルロール、デキストラン、アガロース、イオン交換樹脂などが挙げられるが、これらに限定されるものではなく、また、これらと無機物を併用することもできる。
【００２２】
生物処理に用いられる微生物としては従来公知の好気性菌及び嫌気性菌の中から適宜選択すればよい。好気性菌としては、例えばシュードモナス属、アシトバクター属等が挙げられる。また、嫌気性菌としては、例えばメタン細菌、クロストリジウム属等が挙げられる。上記生物処理は、例えば処理温度１０〜４０℃、ｐＨ６．０〜９．０、水理学的滞留時間（ＨＲＴ）２４〜４８時間の条件下に行なうことができる。
【００２３】
以下、図面を用いて本発明の好適な実施の形態を説明する。
【００２４】
図１は、本発明方法の実施の一形態を示すフロー図である。必要に応じて凝集分離処理を行った有機物含有廃水をマイクロ波照射装置４を有するマイクロ波処理漕１に供給し、次いで、廃水中にアルカリ土類金属の酸化物及び／又は水酸化物を投入し攪拌する。該廃水に必要に応じてマイクロ波を照射し、加熱する。得られた処理水は散気管３を有する生物分解漕２に導かれ好気下で生物処理される。取り出された処理水は活性炭処理槽に通した後排出される。
【００２５】
【実施例】
以下、実施例及び比較例を挙げて、本発明をより具体的に説明する。
【００２６】
実施例１
自動車用水性塗料の塗装廃水を有機物含有廃水として用いた。該有機物含有廃水（Ａ）のＣＯＤＭｎは８，２００ｍｇ／ｌ及びＴＯＣは９，１５０ｍｇ／ｌであった。この塗料廃水（Ａ）１ｌに凝集剤「クリスタックＢ１００」(栗田工業社製)を１５，００ｍｇ、「クリスタックＢ４５０」(栗田工業社製)を１，５００ｍｇ添加して攪拌した後１日放置し、凝集物を取り除いた。この凝集処理後の処理液（Ｂ）のＣＯＤＭｎは４，９００ｍｇ／ｌ及びＴＯＣは５，６２０ｍｇ／ｌであった。該処理液（Ｂ）の１０重量％に相当する量の水酸化カルシウム粉末を処理液（Ｂ）中に添加して攪拌した後、マイクロ波（周波数２．４５ＧＨｚ、出力５５０Ｗ）を１０分間照射した。この処理後の処理液（Ｃ）のＣＯＤＭｎは３，７５０ｍｇ／ｌ及びＴＯＣは４，４００ｍｇ／ｌであった。
【００２７】
次いで該処理液（Ｃ）を生物反応槽に入れ、シュードモナス属、アシトバクター属、ロドコッカス属、バチルス属、キャンディダ属及びフザリウム属の好気性菌を有する活性汚泥を使用し、処理温度２０〜２５℃、ｐＨ７〜８．５及び水理学的滞留時間４８時間の条件下に生物処理を行った後、生物処理水を濾過した。得られた処理水（Ｄ）はＣＯＤＭｎは５２ｍｇ／ｌ及びＴＯＣは６４ｍｇ／ｌであった。
【００２８】
実施例２
上記実施例１において、水酸化カルシウムの代わりに水酸化マグネシウムを用いた以外は実施例１と同様にして処理を行った。得られた処理水（Ｄ）はＣＯＤＭｎは２５０ｍｇ／ｌ及びＴＯＣは２８５ｍｇ／ｌであった。
【００２９】
実施例３
上記実施例１において、マイクロ波の照射をせずに、水酸化カルシウム添加後４０℃で４８時間攪拌する以外は実施例１と同様に処理を行った。得られた処理水（Ｄ）はＣＯＤＭｎは５５０ｍｇ／ｌ及びＴＯＣは６５５ｍｇ／ｌであった。
【００３０】
実施例４
上記実施例１において、マイクロ波の照射をせずに、水酸化カルシウム添加後８５℃で５時間攪拌する以外は実施例１と同様に処理を行った。得られた処理水（Ｄ）はＣＯＤＭｎは２９０ｍｇ／ｌ及びＴＯＣは３２０ｍｇ／ｌであった。
【００３１】
比較例１
上記実施例１において、水酸化カルシウム添加処理をせずに、凝集処理後の処理液（Ｂ）をそのまま生物反応槽に入れて実施例１と同様の生物処理を行った。得られた処理水（Ｄ）はＣＯＤＭｎは２，９５０ｍｇ／ｌ及びＴＯＣは３，５６０ｍｇ／ｌであった。
【００３２】
比較例２
上記実施例１において、水酸化カルシウムの代わりに酸化アルミニウムを処理液（Ｂ）の１０重量％に相当する量添加した以外は実施例１と同様にして処理を行った。得られた処理水（Ｄ）はＣＯＤＭｎは２，８００ｍｇ／ｌ及びＴＯＣは３，３４０ｍｇ／ｌであった。
【００３３】
上記実施例及び比較例の廃水処理実験の結果をまとめると下記表１のようになる。
【００３４】
【表１】
【発明の効果】
本発明方法によれば、塗料廃水などの工業廃水や農業廃水など、有機物含有廃水中に含まれる有機物の分解を促進することができ、特に生物処理の前処理としてマイクロ波を照射することにより、廃水中の難分解性の有機物を効率的に且つ十分に分解することができる。
【図面の簡単な説明】
【図１】本発明の好適な実施の態様を説明する廃水処理フロー図である。
【符号の説明】
１ マイクロ波処理槽
２ 生物分解漕
３ 散気管
４ マイクロ波照射装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating waste water containing organic matter.
[0002]
[Prior art and problems]
Conventionally, industrial wastewater such as paint wastewater discharged from paint factories and wastewater containing a large amount of organic matter, such as agricultural wastewater, are generally subjected to agglomeration separation (floating or sedimentation) treatment and then biological treatment under aerobic conditions. there were. However, in biological treatment, the ability of microorganisms to decompose organic substances is limited, and even if organic substances that are difficult to decompose, for example, water-soluble organic substances containing nitrogen, remain in the treated water as they are or can be treated with this technique, There were problems such as the need to process for a long time.
[0003]
Therefore, various methods such as an ozonolysis method, a Fenton method, and a UV irradiation method have been developed in order to convert a hardly decomposable organic substance contained in waste water into a substance that is easily decomposed by microorganisms. For example, JP-A-8-155308 discloses a treatment method for oxidatively decomposing waste water containing organic substances by irradiating ultraviolet rays and / or visible rays in the presence of a photooxidation catalyst. However, it is difficult to sufficiently decompose the pollutants by these methods, and there is a risk that the undecomposed substances remain in the final treated water when the concentration of pollutants increases or the treatment amount increases. .
[0004]
An object of the present invention is to provide a method for treating organic matter-containing wastewater that can efficiently and sufficiently decompose organic matter contained in wastewater.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have added an alkaline earth metal oxide and / or hydroxide to the organic matter-containing wastewater, and sufficiently decomposed the organic matter contained in the wastewater. As a result, the present invention has been completed.
[0006]
That is, the present invention is such that after the organic matter-containing wastewater is coagulated and separated , the organic matter contained in the wastewater is heated by microwave irradiation in the presence of an oxide and / or hydroxide of an alkaline earth metal. The present invention also relates to a method for treating waste water containing organic matter, characterized by performing biological treatment and decomposing.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, organic matter-containing wastewater is industrial wastewater, agricultural wastewater, domestic wastewater, etc. discharged from factories or business establishments, and particularly includes paint wastewater. Examples of the paint wastewater include a paint line of an automobile, a paint booth water in a sheet metal factory, a waste water containing paint components from a paint manufacturing factory, and washing water in various factories.
[0008]
These wastewaters contain various pigments, dyes, organic resins, cross-linking agents, organic solvents, surfactants, fats and oils, and other organic components according to their types. It varies depending on the type of wastewater, the source factory, or the time zone in which it occurs, and is not constant. For example, as an example of the waste water of an automobile painting line, 1-100 g / l of sediment, COD Mn 1,000-10,000 mg / l, TOC 1,000-15,000 mg / l, BOD 1,000-5,000 mg / L and the organic solvent was about 1 to 10,000 mg / l. Here, COD Mn is the chemical oxygen supply, TOC is the total organic carbon, and BOD is the biochemical oxygen demand.
[0009]
Of the organic matter-containing wastewater, wastewater containing a large amount of solids is desirably subjected to agglomeration and separation treatment by adding a flocculant or electrolytic treatment, if necessary. The flocculation separation treatment may be any step before or after the method of the present invention. In particular, in the present invention, the flocculation separation treatment is first performed as a previous step, and sludge (sludge) that floats or settles and separates from waste water, It is desirable to use treated water from which solids have been separated and removed, and to provide the treated water to the method of the present invention.
[0010]
As the flocculant, for example, inorganic flocculants represented by aluminum sulfate, polyaluminum chloride, ferric chloride and the like, low molecular flocculants such as surfactants, anionic, weak anionic, nonionic or cationic A polymer flocculant etc. can be mentioned, and these can be used alone or in combination of two or more according to the kind of waste water.
[0011]
In addition, in the electrolytic treatment, an electrode is put into waste water to pass an electric current, and fine bubbles of oxygen and hydrogen generated by electrolysis of water are used to adsorb pigments and resins in the waste water, and the buoyancy of the bubbles causes them to buoy. This is a method for collecting substances on the surface of wastewater, and is effective even when combined with a treatment with a flocculant. In the electrolytic treatment, an electrolyte is usually charged and dissolved in supplied waste water, and a plurality of electrodes are arranged in the water tank at appropriate intervals, and electricity is passed between the electrodes to perform electrolysis. As a result, the waste water is agglomerated. It is preferable to use an aluminum electrode as the electrode and sodium nitrate, sodium chloride or the like as the electrolyte.
[0012]
In the present invention, after removing the aggregate by sedimentation or filtration as described above, for example, a hydrophilic organic solvent, a water-soluble organic resin or the like that cannot be removed by the aggregation separation process is used. Decompose using oxides and / or hydroxides.
[0013]
The alkaline earth metal oxide and / or hydroxide used in the present invention is desirably water-insoluble, and calcium is particularly preferred as the alkaline earth metal from the viewpoint of cost and organic matter resolution. Alkali earth metal oxides react with water to form hydroxides. At this time, since they react vigorously with heat generation, hydroxides are preferable from the viewpoint of handling properties and stability. Further, as the alkaline earth metal oxide and / or hydroxide, a composite metal oxide and / or hydroxide containing an alkaline earth metal may be used.
[0014]
The decomposition of the organic-containing wastewater using the alkaline earth metal oxide and / or hydroxide is performed by adding the alkaline earth metal oxide and / or hydroxide to the wastewater and heating as necessary. While stirring. After completion of the treatment, the alkaline earth metal oxide and / or hydroxide can be recovered by filtration and reused.
[0015]
The amount of the alkaline earth metal oxide and / or hydroxide is appropriately selected depending on the type and concentration of the organic matter contained in the wastewater, and usually 0.1 to 50% by weight, preferably 1 with respect to the wastewater. About 20% by weight is preferable. If the amount added is less than 0.1% by weight, it is difficult to sufficiently decompose the organic matter. On the other hand, if it exceeds 50% by weight, it is difficult to sufficiently stir the treatment tank, and the cost is disadvantageous. So undesirable.
[0016]
In the above treatment, the organic matter resolution can be further increased by heating. As the heating means, microwave irradiation is particularly suitable.
[0017]
The microwave is an electromagnetic wave having a wavelength of about 0.1 to 1,000 mm, and includes UHF (decimeter wave), SHF (centimeter wave), EHF (millimeter wave), and submillimeter wave. Although 2450 MHz, which is internationally allocated for industrial use, is often used, the present invention is not limited to this. The microwave used in the present invention is produced using a microwave generator used in a microwave oven or the like, and is irradiated to paint wastewater that has been subjected to coagulation and separation treatment as necessary. Although the irradiation time can be appropriately selected depending on the concentration of organic matter in the wastewater, the intensity of irradiation light, etc., the irradiation time is usually preferably about 1 minute to 60 minutes.
[0018]
Although the wastewater generates heat by microwave irradiation, generally, the higher the temperature, the higher the rate of decomposition of organic matter. Therefore, there is no need for cooling in a range where there is no work risk such as boiling of the wastewater or volatilization of the organic solvent. Further, the temperature may be further increased in order to increase the decomposition efficiency.
[0019]
In the present invention, biological treatment can be performed as necessary in any step before or after the treatment with the alkaline earth metal oxide and / or hydroxide. In particular, after treatment with the alkaline earth metal oxide and / or hydroxide, when it is necessary to further reduce the amount of organic matter in the wastewater, it is preferable to perform biological treatment.
[0020]
As the biological treatment method, a conventionally known method such as an activated sludge method or a carrier-injected biological treatment method can be used, and the latter biological treatment using a microorganism-immobilized carrier is particularly suitable.
[0021]
The carrier-injection type biological treatment method uses an organic or inorganic carrier, and a microorganism is supported on the carrier, and the organic matter in the wastewater is decomposed by the microorganism, which is more efficient than the activated sludge method. Examples of the material of the organic carrier include a photocurable resin, polyurethane, polyvinyl alcohol, polyethylene, polyacrylamide, polyester, polypropylene, agar, alginic acid, carrageenan, cellulose, dextran, agarose, ion exchange resin, and the like. It is not limited to these, In addition, these and an inorganic substance can also be used together.
[0022]
What is necessary is just to select suitably from conventionally well-known aerobic bacteria and anaerobic bacteria as microorganisms used for biological treatment. Examples of aerobic bacteria include the genus Pseudomonas and the genus Ashitobacter. Examples of the anaerobic bacteria include methane bacteria and Clostridium. The biological treatment can be performed, for example, under conditions of a treatment temperature of 10 to 40 ° C., a pH of 6.0 to 9.0, and a hydraulic residence time (HRT) of 24 to 48 hours.
[0023]
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0024]
FIG. 1 is a flowchart showing an embodiment of the method of the present invention. If necessary, the organic matter-containing waste water that has been subjected to the coagulation and separation treatment is supplied to the microwave treatment tank 1 having the
[0025]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.
[0026]
Example 1
Water-borne paint wastewater for automobiles was used as wastewater containing organic matter. The organic matter-containing wastewater (A) had a COD Mn of 8,200 mg / l and a TOC of 9,150 mg / l. To 1 liter of this paint wastewater (A), 1500 mg of flocculant “Chrystuck B100” (manufactured by Kurita Kogyo Co., Ltd.) and 1,500 mg of “Chrystuck B450” (manufactured by Kurita Kogyo Co., Ltd.) were added and stirred for 1 day. And agglomerates were removed. The COD Mn of the treatment liquid (B) after this aggregation treatment was 4,900 mg / l and the TOC was 5,620 mg / l. An amount of calcium hydroxide powder corresponding to 10% by weight of the treatment liquid (B) was added to the treatment liquid (B) and stirred, and then irradiated with microwaves (frequency 2.45 GHz, output 550 W) for 10 minutes. . The treatment liquid (C) after this treatment had a COD Mn of 3,750 mg / l and a TOC of 4,400 mg / l.
[0027]
Next, the treatment liquid (C) is put into a biological reaction tank, and activated sludge having aerobic bacteria of Pseudomonas, Ashitobacter, Rhodococcus, Bacillus, Candida and Fusarium is used, and the treatment temperature is 20 to 25 ° C. After biological treatment was carried out under conditions of pH 7 to 8.5 and hydraulic residence time 48 hours, the biological treated water was filtered. The treated water (D) obtained had a COD Mn of 52 mg / l and a TOC of 64 mg / l.
[0028]
Example 2
In Example 1 above, treatment was performed in the same manner as Example 1 except that magnesium hydroxide was used instead of calcium hydroxide. The obtained treated water (D) had a COD Mn of 250 mg / l and a TOC of 285 mg / l.
[0029]
Example 3
In Example 1, the treatment was performed in the same manner as in Example 1 except that the mixture was stirred at 40 ° C. for 48 hours after the addition of calcium hydroxide without being irradiated with microwaves. The treated water (D) obtained had COD Mn of 550 mg / l and TOC of 655 mg / l.
[0030]
Example 4
In Example 1, the treatment was performed in the same manner as in Example 1 except that the mixture was stirred at 85 ° C. for 5 hours after adding calcium hydroxide without being irradiated with microwaves. The obtained treated water (D) had COD Mn of 290 mg / l and TOC of 320 mg / l.
[0031]
Comparative Example 1
In the said Example 1, the biological treatment similar to Example 1 was performed by putting the process liquid (B) after an aggregation process into a biological reaction tank as it was, without performing calcium hydroxide addition process. The obtained treated water (D) had COD Mn of 2,950 mg / l and TOC of 3,560 mg / l.
[0032]
Comparative Example 2
In Example 1, the treatment was performed in the same manner as in Example 1 except that aluminum oxide was added in an amount corresponding to 10% by weight of the treatment liquid (B) instead of calcium hydroxide. The obtained treated water (D) had COD Mn of 2,800 mg / l and TOC of 3,340 mg / l.
[0033]
The results of the wastewater treatment experiments of the above examples and comparative examples are summarized as shown in Table 1 below.
[0034]
[Table 1]
【The invention's effect】
According to the method of the present invention, decomposition of organic matter contained in organic matter-containing wastewater, such as industrial wastewater such as paint wastewater and agricultural wastewater, can be promoted. It is possible to efficiently and sufficiently decompose the hardly decomposable organic matter in the wastewater.
[Brief description of the drawings]
FIG. 1 is a wastewater treatment flow diagram illustrating a preferred embodiment of the present invention.
[Explanation of symbols]
1
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002242871A JP4065743B2 (en) | 2002-08-23 | 2002-08-23 | Treatment method of organic wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002242871A JP4065743B2 (en) | 2002-08-23 | 2002-08-23 | Treatment method of organic wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004081905A JP2004081905A (en) | 2004-03-18 |
| JP4065743B2 true JP4065743B2 (en) | 2008-03-26 |
Family
ID=32051787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002242871A Expired - Fee Related JP4065743B2 (en) | 2002-08-23 | 2002-08-23 | Treatment method of organic wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4065743B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116272949B (en) * | 2023-02-06 | 2024-10-25 | 山东默同生态有限公司 | Porous catalyst and preparation method and application thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830671A (en) * | 1971-08-25 | 1973-04-23 | ||
| JPS496764A (en) * | 1972-05-06 | 1974-01-21 | ||
| JPS51119163A (en) * | 1975-04-09 | 1976-10-19 | Ootori Senko Kk | Treating method of waste liquor of sodium silicate solution containing oils |
| JPS54161749A (en) * | 1978-06-09 | 1979-12-21 | Agency Of Ind Science & Technol | Disposal of waste water containing emulsified oil |
| JP2003088892A (en) * | 2001-09-18 | 2003-03-25 | Mitsubishi Heavy Ind Ltd | Organic waste water treatment apparatus |
-
2002
- 2002-08-23 JP JP2002242871A patent/JP4065743B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004081905A (en) | 2004-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7431850B2 (en) | Process for purification treatment of wastewater containing organic substance | |
| Xia et al. | Analysis of factors influencing on Electro-Fenton and research on combination technology (II): a review | |
| Ullah et al. | Automotive wastewater treatment processes and technologies: A review | |
| Mouli et al. | Electrochemical processes for the remediation of wastewater and contaminated soil: emerging technology | |
| Chakraborty et al. | AOPs for municipal and tannery based industrial wastewater treatment | |
| US6902674B2 (en) | Treating method for coating material waste water | |
| Salameh | Treatment of olive mill wastewater by ozonation and electrocoagulation processes | |
| JP2004136274A (en) | Treatment method of paint waste water | |
| Sindhi et al. | COD removal of different industrial wastewater by Fenton oxidation process | |
| Sadeghi et al. | Performance evaluation of a biological landfill leachate treatment plant and effluent treatment by electrocoagulation | |
| JP4541776B2 (en) | Purification method for wastewater containing organic substances | |
| JP4065743B2 (en) | Treatment method of organic wastewater | |
| JP2007029825A (en) | Waste water treatment apparatus and waste water treatment method using this apparatus | |
| Odhaib et al. | A review of color and COD removal from textile effluent by coagulation and advanced oxidation processes | |
| JP2004081904A (en) | Treatment method for organic matter-containing wastewater | |
| CN105174568A (en) | Method used for ultrasonic treatment of waste water | |
| JP2004089991A (en) | Painting waste water treatment method | |
| Raagasweatha et al. | Hybrid strategies for the treatment of latex-like wastewater from industries | |
| Venkatachalam et al. | Recent trends in advanced oxidation processes for tannery effluent treatment–A review | |
| Guvenc et al. | Effects of persulfate, peroxide activated persulfate and permanganate oxidation on treatability and biodegradability of leachate nanofiltration concentrate | |
| Baskaran et al. | Integrated Advanced Oxidation Process for the Treatment of Pharmaceutical Effluent. | |
| KR100225693B1 (en) | Hardly degradable organic material treatment method | |
| CN215924703U (en) | Hazardous waste landfill leachate evaporation treatment system | |
| CN222975040U (en) | A fully quantitative deep treatment system for landfill leachate | |
| JPH1076296A (en) | Treatment method for drainage containing poorly decomposable organic substance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050721 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071001 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071016 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20071129 |
|
| 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: 20071225 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080107 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110111 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110111 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110111 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120111 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120111 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130111 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130111 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130111 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140111 Year of fee payment: 6 |
|
| 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 |
|
| LAPS | Cancellation because of no payment of annual fees |