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1、第44卷第3期應(yīng)用化工Vo1.44No.32015年3月AppliedChemicalIndustryMar.2015AAO法處理焦化廢水中氨氮及COD的實(shí)驗(yàn)研究高雯雯。,張智芳,孫琪。,李貝貝。(1.榆林學(xué)院陜西省低變質(zhì)煤潔凈利用重點(diǎn)實(shí)驗(yàn)室,陜西榆林719000;2.榆林學(xué)院榆林市綠色化學(xué)與化32過(guò)程綠色化重點(diǎn)實(shí)驗(yàn)室陜西榆林719000;3.榆林學(xué)院化學(xué)與化工學(xué)院,陜西榆林719000)摘要:采用厭氧-缺氧一好氧工藝處理焦化廢水,在穩(wěn)定運(yùn)行階段,考察了系統(tǒng)及其各反應(yīng)段對(duì)COD及氨氮的降解情況。結(jié)果表明,系統(tǒng)對(duì)COD及氨氮的去除率分別為86.7%,97.2%,最終出水COD
2、濃度低于150mg/L,氨氮濃度低于15m#L,達(dá)到國(guó)家廢水排放標(biāo)準(zhǔn)。系統(tǒng)運(yùn)行穩(wěn)定時(shí),各段對(duì)COD及氨氮的降解能力不同:COD去除率由大到小為缺氧池、好氧池和厭氧池;氨氮去除率由大到小為好氧池、缺氧池和厭氧池,初步探討了AAO各段運(yùn)行機(jī)理。關(guān)鍵詞:焦化廢水;AAO;氨氮;COD中圖分類號(hào):TQ520.9;x703.1文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1671—3206(2015)03—0470—03ExperimentstudyontreatmentofNH3一NandCODincokingwastewaterwithAAOprocessGAOWen—wen。,ZHANGZhing,
3、SUNQi。,LIBei—bei(I.ShaanxiKeyLaboratoryofLowMetamorphicCoalCleanUtilization,YulinUniversity,Yulin719000,China;2.YulinKeyLaboratoryofGreenChemistryandGreenChemicalEngineering,YulinUniversity,Yulin719000,China;3.SchoolofChemistryandChemicalEngineering,YulinUniversity,Yulin719000,China)Abstra
4、ct:Cokingwastewaterwastreatedbyanaerobic/anoxic/aerobicbiologicalprocess,thedegradationconditionsofCODandNH3一NinunitsoftheAAOsystemandthewholesystemwereinvestigatedinsta—bleoperationphase.Theresultsshow:theremovalratesofCODandNH3一Nwere86.7%and97.2%,re—spectively.Theaverageconcentrationinef
5、fluentforCODandNH3-Nwerelessthan150mg/Land15mg/L,respectively,whichcouldmeetthenationaldischargestandard.WhenthesystemwasrunningnormaUyandstably,theremovalratesofCODandNH3一Ninunitsofthesystemwereverydiferent:ofCODfrombigtosmallinproperorderwere:anoxicstage,aerobicstageandanaerobicstage,and
6、ofNH3-Nwasasfollows:aerobicstage,anoxicstageandanaerobicstage.Finally,therunningmechanisminunitsoftheAAOsystemwereprimarydiscussed.Keywords:cokingwastewater;hydrolysisplusanoxicandaerobic;ammonianitrogen;chemicaloxygendemand焦化廢水是煤制焦炭、煤氣凈化以及焦化產(chǎn)品AAO法在AO法的基礎(chǔ)上增加了厭氧酸化段回收精制過(guò)程中產(chǎn)生的廢水,含有多種有機(jī)污染物(A段)
7、,不僅提高了廢水的可生化性,同時(shí)對(duì)有毒和無(wú)機(jī)污染物,其中難生物降解物質(zhì)主要為多環(huán)芳污染物也具有明顯的轉(zhuǎn)化和降解作用,因此整個(gè)系烴類和含氮、含硫及含氧雜環(huán)類化合物,是一種典型統(tǒng)有較高的處理能力和效率引。相對(duì)其他AO變難降解的工業(yè)廢水u】。生物法由于具有處理效率形工藝,AAO工藝具有工藝簡(jiǎn)單、總水力停留時(shí)間高、成本低、容易操作等特點(diǎn),常用來(lái)處理焦化廢短、運(yùn)行費(fèi)用低、處理效率較好等優(yōu)點(diǎn),同時(shí)該工藝水-2剖。常用的方法有AO法及其變形工藝如AAO、厭氧(缺氧)/好氧交替運(yùn)行,不宜絲狀菌的繁殖,基AAO0等。本不存在污泥膨脹