A_2O工艺中反硝化除磷及过量曝气对生物除磷的影响_王晓莲

第56卷第8期化工学报Vol.56No.82005年8月JournalofChemicalIndustryandEngineering(China)August2005研究论文A2O工艺中反硝化除磷及过量曝气对生物除磷的影响王晓莲1,王淑莹1,马勇2,彭永臻1(1北京工业大学水环境恢复重点实验室,北京100022;2哈尔滨工业大学市政与环境工程学院,黑龙江哈尔滨150090)摘要:如何有效提高城市污水厂除磷效率一直是研究的热点,而反硝化除磷菌可以在碳源不足的条件下,通过“一碳两用”的方式同时实现反硝化脱氮和吸磷作用,是一种新型高效的技术.试验以啤酒废水为研究对象,验证了厌氧-缺氧-好氧(A2O)工艺中反硝化除磷现象的存在及其对系统脱氮除磷的影响.试验结果表明,A2O系统稳定运行时,反硝化聚磷菌在缺氧区可利用在厌氧段储存的PHB大量吸磷,同时氮也得到去除,计算表明缺氧除磷量可占厌氧总释磷量的71.3%,另外可节约曝气能耗25%.无论系统进水COD浓度从200mgL-1变化为400mgL-1,COD、总氮和总磷去除率总能保持较高水平,平均出水总氮和总磷浓度分别小于10mgL-1和0.30mgL-1.另外发现,过量曝气对系统除磷具有明显的影响,导致除磷效率降低,甚至会产生不吸磷现象,系统需要经过约一个污泥龄时间才能恢复其吸磷能力,所以应加强系统曝气的控制.关键词:A2O工艺;反硝化除磷;过量曝气;脱氮除磷中图分类号:X703.1文献标识码:A文章编号:0438-1157(2005)08-1565-06AnoxicbiologicalphosphorusremovalandeffectofexcessiveaerationonbiologicalphosphorusremovalinA2OprocessWANGXiaolian1,WANGShuying1,MAYong2,PENGYongzhen1(1SchoolofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022,China;2SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,Heilongjiang,China)Abstract:Apilot-scalenutrientremovalactivatedsludgesystem,basedontheA2Oconfiguration,wasusedtotreatbrewerywastewater.Intheexperiment,theexistenceofdenitrifyingphosphorusremovingbacteria(DPB)andthecontributionofDPBtophosphorusremovalwasobserved.ThetestsshowedtheaveragetotalamountofanoxicPuptakeaccountedfor70%ofthetotalamountofPuptakeofthesystematsteadystate,oxygenrequirementcouldbedecreasedsignificantly(about25%).DenitrifyingphosphateremovalresolvedthecompetitionfororganicsubstratesbetweenPoly-Porganismsanddenitrifiersunderlowerorganicloading.Effluenttotal-Pconcentrationcouldachievelessthan0.30mgL-1andaverageeffluenttotal-Nwaslessthan10mgL-1.Itisclearlydemonstratedthatthephosphorusuptakealmoststoppedinanover-aeratedsystem,thereleasedphosphoruscouldnotbetakenupfullyagain.Consequently,incompletephosphorusuptakeledtotemporaryreductionofbiologicalphosphorousremovalefficiency.Ittookaboutthetimeofonesludgeagetoeliminatethatdisturbance.Keywords:A2Oprocess;anoxicbiologicalphosphorusremo