氨氮对内循环生物流化床亚硝化过程影响_雷鸣

第40卷第6期2008年6月哈尔滨工业大学学报JOURNALOFHARBININSTITUTEOFTECHNOLOGYVol.40No.6Jun.2008氨氮对内循环生物流化床亚硝化过程影响雷鸣1,温沁雪1,陈志强1,施汉昌2(1.哈尔滨工业大学市政环境工程学院,哈尔滨150090,E-mail:lei-0647@sohu.com;2.清华大学环境科学与环境工程系,北京100084)摘要:为实现内循环生物流化床(ITFB)短程脱氮处理高氨氮废水,在小试ITFB反应器内考察了氨氮浓度对生物膜亚硝化特性的影响.通过5个月的连续试验,研究了ITFB反应器历经启动培养、短暂亚硝化、硝化系统破坏、硝化系统恢复、完全硝化五个过程中,氨氮、硝酸盐氮和亚硝酸盐氮的转化规律及游离氨毒性作用对短程硝化过程的影响.试验结果表明:反应器启动初期出现了短暂亚硝化,平均亚硝化率为79%;在进水氨氮浓度增加到300mg/L时,系统再次实现了亚硝化,平均亚硝化率达81%,但由于游离氨浓度的影响使得系统硝化能力受到严重影响,系统氨氮去除率降低至22%;系统恢复后,亚硝化现象不明显.反应器内游离氨浓度随进水氨氮浓度升高而增加至8mg/L时,系统内硝化细菌和亚硝化细菌活性均受到抑制.通过提高进水氨氮浓度来实现系统短程脱氮过程稳定运行的可逆性较差.关键词:ITFB;硝化;亚硝化;游离氨;亚硝化率中图分类号:TU992.3文献标识码:A文章编号:0367-6234(2008)06-0891-04Effectofammoniaconcentrationonnitritationprocessininternal-circulationthree-phasebio-fluidizedbed(ITFB)LEIMing1,WENQin-xue1,CHENZhi-qiang1,SHIHan-chang2(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China,E-mail:lei-0647@sohu.com;2.Dept.ofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Inordertoachievepartialnitrificationvianitrite(nitritation)ininternal-circulationthree-phasebio-fluidizedbed(ITFB)totreathighstrengthnitrogen,theeffectofammoniaconcentrationonthebiofilmni-tritationprocesswasinvestigatedinalab-scaleITFBreactor.Duringfivemonths,theexperimentalperiodsweredividedintofivedifferentphases,includingthestartupphase,thetemporarynitritationphase,thede-stroyphaseofnitrification,therecoveryphaseofnitrificationandthecompletenitrificationphase.Thetrans-formationrelationshipamongnitrogenspeciesandtheinhibitioneffectoffreeammoniaonnitritationprocesswereinvestigated.Theresultsshowedthatthenitritationratioof79%wasachievedunderthestart-upcondi-tion.Whentheammoniaconcentrationininfluentincreasedfrom100mg/Lto300mg/L,partialnitrificationwasobtainedagainandtheaveragenitritationratiowas81%.However,thenitrificationcapacitywasde-stroyedbythehighconcentrationoffreeammonia;correspondinglytheammoniaremovalratewasdecreasedto22%;nonitritationwasobservedafterthesystemwasrecovered.The