微氧水解酸化工艺处理高浓度抗生素废水

微氧水解酸化工艺处理高浓度抗生素废水祁佩时,丁雷,刘云芝(哈尔滨工业大学市政环境工程学院,哈尔滨150090)摘要:试验研究了高浓度难生物降解抗生素废水微氧水解酸化效果.结果表明,微氧环境提高了兼性水解酸化菌的生理代谢功能,曝气搅拌改善了水力条件,在最短HRT为10h,最大OLR为20kg/(m3·d)条件下,酸化率为58164%,出水VFA为4825mg/L,极大地改善了废水的生物降解性能,BOD5/COD升高了17%左右,为后续好氧生物处理提供了良好的基质准备.在进水水质波动较大的情况下,出水水质相对稳定,出水COD和SS浓度分别为7000～8000mg/L和150～300mg/L,COD和SS去除率分别为15%～30%和90%～95%.出水VFA的变化滞后于酸化率的变化,酸化率能更好地表征水解酸化系统的效果.反应器底部的污泥床层是VFA生成的主要反应区,随着OLR的升高,达到稳定VFA浓度的反应器高度逐渐增加.填料区功能主要在于截留出水中的SS.污泥以粒径为015～110mm之间的小颗粒污泥和絮状污泥为主.关键词:微氧水解酸化;抗生素废水;VFA;酸化率;生物降解性能中图分类号:X787文献标识码:A文章编号:025023301(2005)0320106206收稿日期:2004205230;修订日期:2004210208基金项目:黑龙江省科委重大科技攻关项目(Z99A1124)作者简介:祁佩时(1955～),男,博士,博士生导师,主要从事环境工程方面的教学和科研工作.TreatingHighStrengthAntibioticWastewaterbyMicro2AerobicHydrolysisandAcidificationProcessQIPei2shi,DINGLei,LIUYun2zhi(SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China)Abstract:Theeffectofmicro2aerobichydrolysisandacidificationtohighstrengthantibioticwastewatertreatmentisstudied.Theresultsdemonstratethatmicrooxygenenhancedthephysiologicalmetabolizabilityoffacultativehydrolyticandacidogenicbacteria,andaeratingstirringimprovedthehydrauliccondition.Degreeofacidification(AD)andvolatilefattyacid(VFA)intheeffluentreached58164%and4825mg/LwiththeshortestHRT10handthemaximalOLR20kg/(m3·d),respectively.WastewaterbiodegradabilitywasimprovedgreatlyandrisingBOD5/CODwasabout17%,whichofferedgoodsubstrateforpostaerobictreatment.Theeffluentqualitywasrelativestablewiththefluctuantinfluent,andCODandSSwere7000～8000mg/Land150～300mg/L,respectively,whiletheremovalefficienciesofCODandSSwere15%～30%and90%～95%.ThechangementofVFAlaggedbehindthatofADintheeffluent,andADwouldrepresenttheeffectofhydrolysisandacidificationprocessmoreproperly.ThesludgebedinthebottomofthereactorwasthemainreactionfieldforVFAproduction,andtheheightofthereactorforstableVFAproductionincreasedwiththeincreaseofOLR.ThefillingfieldmainlyaimedtoentrapSSintheeffluentandbenefitedlittletoVFAproduction.Sludgeinthereactorwasmainlylittlesludgeparticleswithth