EGSBTP耿炤宇1, 董春娟2, 王增长1(1.太原理工大学环境科学与工程学院,山西太原030024;2.太原大学环境工程系,山西太原030009) : 采用硫酸铝混凝强化去除微氧EGSB反应器出水中的TP,考察了混凝时间和沉淀时间、混凝剂投量、pH和温度等对强化除磷效果的影响,以分析微氧EGSB/化学混凝组合工艺作为生活污水再生回用工艺的可行性。结果表明,在最佳Al3+/TP值(质量比)为1.5~2.3、混凝时间为20min、沉淀时间为20min的条件下,对TP的去除率可达94.6%~96.4%,出水TP可降至0.29mg/L,达到了GB18918—2002的一级A标准,证明了微氧EGSB/化学混凝组合工艺作为生活污水再生回用工艺是可行的。硫酸铝的混凝除磷效果对pH的变化较敏感,最佳pH值范围为6.5~7.2,此时对TP的去除率可达到90.8%~92.1%;微氧EGSB反应器出水pH值为6.5~8.5,投加硫酸铝后能获得85%以上的TP去除率,出水TP最高可达0.85mg/L,因此需要适当调节pH使出水TP0.5mg/L,以满足回用要求。硫酸铝混凝除磷的适宜温度为10~25℃,微氧EGSB反应器出水的温度满足此要求。 : 化学混凝除磷; 微氧EGSB; 生活污水; 回用; 硫酸铝:X703 :C :1000-4602(2010)09-0124-04 :(2007031104-1); (0702006)EnhancedChemicalCoagulationforTPRemovalfromEffluentofMicro-aerobicEGSBReactorGENGZhao-yu1, DONGChun-juan2, WANGZeng-zhang1(1.CollegeofEnvironmentalScienceandEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,China;2.DepartmentofEnvironmentEngineering,TaiyuanUniversity,Taiyuan030009,China) Abstract: Inordertoconfirmthefeasibilityofusingthecombinedprocessofmicro-aerobicEGSBreactorandchemicalcoagulationforphosphorusremovalasadomesticsewagetreatmentprocess,alumi-numsulfatewasemployedtoenhanceTPremovalfromtheeffluentofthemicro-aerobicEGSBreactor,andtheinfluencesofcoagulationandprecipitationtimes,pH,coagulantdosageandtemperatureontheenhancedphosphorusremovalwereinvestigated.TheresultsshowthatwhentheoptimalmassratioofAl3+/TPis1.5to2.3,thecoagulationandprecipitationtimesareall20min,TPremovalrateis94.6%to96.4%andtheeffluentTPis0.29mg/L,whichmeetsthefirstlevelAcriteriaspecifiedintheDis-chargeStandardofPollutantsforMunicipalWastewaterTreatmentPlant(GB18918-2002).Thecom-binedprocessisfeasiblefordomesticsewagetreatment.Aluminumsulfatecoagulationphosphorusremov-·124·第26卷 第9期2010年5月 中国给水排水CHINAWATERWASTEWATER Vol.26No.9May2010alprocessisverysensitivetopH,withtheoptimalpHof6.5to7.2atwhichtheTPremovalratecanreach90.8%to92.1%.ButwiththeeffluentpHof6.5to8.5forthemicro-aerobicEGSBreactor,theTPremovalrateisabove85%afteradditionofaluminumsulfate,andthehighesteffluentTPconcentra-tioncanreach0.85mg/L.Therefore,inordertomeetthereuserequirement,itisnecessarytoadjustthepHtoallowtheeffluentTPtobelessthan0.5mg/L.Theoptimaltemperatureforthealuminumsul-fatecoagulationphosphorusremovalprocessis10to25℃,andthetemperatureoftheeffluentfromthemicro-aerobicEGSBreactormeetstherange. Keywords: chemicalcoagulationphosphorusremoval; micro-aerobicEGSB; domesticsew-age; reuse; aluminumsulfate (EGSB),,,EGSBN、P,[1]。[1],EGSBCOD、NP,TPGB18918—2002A()。,。、、[2、3],pH、、、、[4~6]。,、、、pH、EGSBTP,EGSB/。1 材料与方法1.1 EGSBEGSB,EGSB2.3m,18L;1.8m,10cm,12L;8L。1。,EGSB。,,EGSB(DO)。、(ORP)DO,。1 EGSBFig.1 Schematicdiagramofmicro-aerobicEGSBsystemEGSBCOD、NH3-N、TNTP(12~87)、(4.4~12.1)、(6.7~22.6)(2.2~9.3)mg/L,29、10.0、14.04.7mg/L,GB18918—2002A、B、A。EGSBTP。1.2 EGSB(15~26℃);(Al3+8.1%);。EGSB(1L),,,400r/min,1min;(12080r/min),,。。1.3 COD、NH3-N、TNTP;pH;。·125·耿炤宇,等:化学混凝强化去除微氧EGSB出水中的TP第26卷 第9期2 结果与讨论2.1 EGSBpH7.9、TP5.12mg/L、1.02NTU、15℃,40g/L,6、8、11、1419min,,1。1 TPTab.1 InfluenceofcoagulationtimeonTPremovalrate% /min68111419/mL128.5521.1833.2930.1432.01266.8068.7876.2050.7160.43386.4792.1693.4086.4184.51495.0395.7395.1994.3393.60595.3697.1195.6095.2794.62695.3896.9795.8795.2796.16 1,40g/L,,8~11min。,3mL,8~11minTP92.16%~93.40%,TP。,(20g/L),TP。EGSB12℃、pH7.91、TP4.03mg/L、3.63NTU,6mL、20g/L,5、10、15、2025min,20、40、60、80、100min,TP2。2 TPTab.2 ChangeofTPremovalratewithcoagulationandsedimentationtime% /min510152025/min2078.180.680.884.785.440—83.2———60—83.7———80——85.7——100—84.5——— 2,TP,TP,,Al3+,TP。,3mL、40g/L,11minTP93.40%;6mL、20g/L,25min85.4%TP。TP,,10min,20min40、60100min,TP80.6%83.2%、83.7%84.5%。2,TP,,20min。,,TP。40g/L,8~11min;20g/L,20~25min。25g/L,20min。2.2 Al3+/TP(,),Al3+/TP1()。EGSBpH6.6、TP5.33mg/L、1.22NTU、15℃,TP。,,TP,6mL,TP96.4%,Al3+12.2mg/L,Al3+/TP=2.3。TP,,TP。,25g/L4mL,Al3+8.1mg/L,Al3+/TP=1.5,TP94.6%,TP0.29mg/L,GB18918—2002A。,Al3+/TP1.5~2.3。2.3 pHEGSBpH7.1、TP4.73mg/L、1.02NTU、15℃,4mL、25g/L,HClNaOHpH5.5~9.0,pH。,pH5.59.0,TP·126·第26卷 第9期 中国给水排水 ~7.2,TP90.8%~92.1%,TP0.5mg/L;pH9.0,TP84.8%。,pH,EGSBpH(6.5~8.5),85%TP,TP0.85mg/L,,pHTP,TP0.5mg/L,。2.4 5、10、15、20、25℃,。,,,TP。,5℃10℃,TP82%90%;10℃25℃,TP90%92%。,10~25℃,TP90%~92%。,EGSB15~26℃、,。3 结论① EGSBTP,Al3+/TP1.5~2.3、20min、20min,TP94.6%~96.4%,TP0.29mg/L,GB18918—2002A,EGSB/。② pH,pH6.5~7.2,TP90.8%~92.1%;EGSBpH6.5~8.5,85%TP,TP0.85mg/L,pHTP,TP0.5mg/L,。③ 10~25℃,EGSB。:[1] ChuLB,ZhangXW,LiXH,etal.Simultaneousremov-aloforganicsubstancesandnitrogenusingamembranebioreactorseededwithanaerobicgranularsludgeunderoxygen-limitedconditions[J].Desalination,2005,172(3):271-280.[2] WangY,HanT,XuZ,etal.OptimizationofphosphorusremovalfromsecondaryeffluentusingsimplexmethodinTianjin,China[J].JHazardMater,2005,121(1-3):183-186.[3] LeeSI,WeonSY,LeeCW,etal.Removalofnitrogenandphosphatefromwastewaterbyadditionofbittern[J].Chemosphere,2003,51(4):265-271.[4] BanuRJ,DoKU,YeomIT.Phosphorusremovalinlowalkalinitysecondaryeffluentusingalum[J].IntJEnvi-ronSciTechnol,2008,5(1):93-98.