膜生物反应器工艺运行条件对脱氮性能及膜污染影响的试验研究

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1、北京交通大学硕士学位论文膜生物反应器工艺运行条件对脱氮性能及膜污染影响的试验研究姓名：石晓庆申请学位级别：硕士专业：环境工程指导教师：王锦20081201j￡塞交通太堂亟±堂僮j金塞．△旦墨!基△￡!ABSTRACTABSTRACT：TheenergyconsumptionofsubmergedmembranebioreactorisrelativelylowandtheremovalefficiencyforCODishi．gh．However,theremovaleffciencyfortotalnitrogen(TN)needsimproving．Inrecentyea

2、rs，newtypebiologicalnitrogenremovaltechnologiesprovidetheoryfoundationforimprovingnitrogenremovalefficiency．Inthisresearch，reactortemperaturewaskeptat30℃andintermiRentaerationmodeWasadopted．Theinfluenceofthedissolvedoxygen(DO)concentrationandaerationon／offtimeonshort．cutnitrificationanddeni

3、trificationwereinvestigated．Theinfluenceofextracellularpolymericsubstances(EPS)onmembranefoulingwerealsostudied．nemainconclusionsareasfollows：(1)Setaerationon／offtimeat5min／lmin，changeDOconcentrationsto1mg／L、2mg／L、3mg／L、4mg／LandtheTNremovalefficiencyisintherangeof11．28％～39．85％．Thevariationo

4、fDOconcentrationcouldnotimprovenitrogenremovalefficiencysignificantly．TheoptimalTNremovalefficiencyandtheleastseveremembranefoulingstatecouldbeobtainedsimultaneously．(2)SetDOconcentrationat2mg／L，changeaerationon／offtimeto5min／1min、20min／4min、20min／10min、10min／5min、5min／2．5min；theTNremovalef

5、ficiencyisintherangeof30．72％一69．68％．Thevariationofaerationon／offtimecouldimprovenitrogenremovalefficiencysubstantially．BecauseDOconcentrationattheendofaeration-offperiodisbelowlmg／L，thenitrogenremovalefficiencyWasimprovedTheoptimalTNremovalefficiencyandtheleastseveremembranefoulingstatecoul

6、dnotbeobtainedsimultaneously．(3)SetDOconcentrationat4mg／L，variationoftheaerationon／offtimeisthesamewith(2)．TNremovaleffieienciyisintherangeof21．96％'-'34．16％．Thevariationofaerationon／offtimecouldnotimprovenitrogenremovalefficiencysubstantially．BecauseDOconcentrationattheendofaeration-offperi

7、odisabove1．5mg／L，TNremovalefficiencyisonlyhalfofthatwhenDOconcentrationis2mg／L．TheoptimalTNremovalefficiencyandtheleastseveremembranefoulingstatecouldnotbeobtainedsimultaneouslyeither．(4)EPSscontributesmoretomembranefoulingthanLB．Correlationindexesbetwee