倒置A_2_O工艺处理混合污水的研究_石明岩

倒置A2/O工艺处理混合污水的研究石明岩1，冯兆继1，余建恒2，夏耿东2(1．广州大学土木工程学院，广东广州510006;2．广州市大坦沙污水处理厂，广东广州510163)摘要［目的］探讨倒置A2/O工艺处理混合污水关键工艺参数的作用规律。［方法］以实际混合污水为进水，采用倒置A2/O工艺处理混合污水脱氮，研究水力停留时间、好氧区溶解氧浓度、外回流比、泥龄和水温对脱氮的影响。［结果］水力停留时间的延长有利于混合污水处理系统脱氮，为实现高效脱氮，水力停留时间至少应维持8h;在1．0～1．5mg/L浓度范围内增加溶解氧对混合污水脱氮有促进作用;在60%～100%的范围内提高外回流比对硝化反硝化有利;为保证较高的硝化率，泥龄宜控制在20d以上，泥龄在15～30d时，对总氮去除影响不明显;水温的升高对脱氮有明显促进作用，高温对反硝化更为有利。［结论］试验结果在妥善处理粪便污水，实现城市污水厂混合污水的稳定达标排放，减轻水环境氮污染方面具有一定参考价值。关键词倒置A2/O工艺;混合污水;脱氮;水力停留时间;溶解氧浓度;外回流比;泥龄;水温中图分类号X703文献标识码A文章编号0517－6611(2011)14－08537－03TechnologyCharacteristicsofTreatingMixedWastewaterbyInvertedA2/OProcessSHIMing-yanetal(CollegeofCivilEngineering，GuangzhouUniversity，Guangzhou，Guangdong510006)Abstract［Objective］ThestudyaimedtodiscusstheroleruleofkeyprocessparametersfortreatingmixedwastewaterbyinvertedA2/Oprocess．［Method］Withtheactualmixedwastewaterastheinletwater，theinvertedA2/Oprocesswasusedtotreatthemixedwastewaterforthedenitrificationofthemixedwastewatersoastostudytheinfluencesofthehydraulicretentiontime(HRT)，dissolvedoxygen(DO)concn．intheaerobicarea，outsiderefluxratio(R)，sludgeageandwatertemperatureonthedenitrification．［Result］TheextensionofHRTwasfavorabletothedenitrificationinthemixedwastewatertreatmentsystem．Inordertogettheeffectivedenitrification，theHRTshouldmaintain8hatleast．InrangofDOat1．0－1．5mg，increasingtheDOconcn．hadsompromotingeffectonthedenitrificationofmixedwastewater．InrangofRat60%－100%，increasingRwasfavorabletothenitrificationanddenitrification．Inordertoensurethehighernitrificationrate，thesludgeageshouldbecontrolledatabove20d．Sludgeageof15－30dhadnoobviouseffectonthetotalnitrogenremoval．Therisingofwaterterperaturewasmorebeneficialtothedenitrificationandthehighwatertemperaturewasmorefavorabletothedenitrification．［Conclusion］Thestudyprovidedthesci-entificbasisforproperlyhandlingtheexcrementandurinesewage，realizingthedischargingstandardforthemixedwastewaterofthemunicipalwastewatertreatmentplantandreducingthenitrogenpollutionofwaterenvironment．KeywordsReversedA2/Oprocess;Mixedwast