粉煤合成沸石及其在脫氮除磷的研究.pdf

1、安徽理工大學(xué)碩士學(xué)位論文粉煤合成沸石及其在脫氮除磷的研究姓名：吳斌申請學(xué)位級別：碩士專業(yè)：環(huán)境工程指導(dǎo)教師：桂和榮20100606安徽理工大學(xué)碩士學(xué)位論文AbstractAsthemainsolidwasteofcoalfiredpowerplant，theannualemissionofcoalflvashisupto30milliontons，andtheannualashreservoirareaincreasedisupto82

2、37thousandacresSomuchcoalflyashneedsalargeofcroplandtodepositandcausemanyenvironmentproblemsinatmosphere，waterandsoilenvironmentOnlyalittleoftheseflyashisusedasbuildingmaterialsproducts，buildingengineering，transportation

3、andsoilimprovementetcTherecyclingtechniqueoftheflyashseemstoismorerough，andtheindustrychainisSOshortAndtheresearcheswhichappIycoalflyashintotheusageofwastewatertreatmenthavenotachievedsomeimportantresultsandtheresearchde

4、pthisinadequateTheseresearchesdidn’tdevelopnewDathsincomprehensiveutilizationofthevaluableresourcetothegreatestextentTheaccumulationofthenitrogenandphosphoruscancauseeutrophicationinlakesandestuariesTherefore，theremovalo

5、fthenutrientsfromwastewaterbeforedischargehasbeenthehighlightofresearchinrecentyearsInthisstudy，thehydrothermalconversionofaChineseflyashintozeolitehasalsobeeninvestigatedintensivelyasafunctionoftemperature，liquid／solidr

6、atio，NaOHconcentrationandreactiontimeinaclosedretortDenifrificationandDephosphorizationofsynthesizedzeoliteweredeterminedandthecharacteristicsandmechanismonthesimultaneousremovalofammoniumandphosphateinthedomesticwastewa

7、terwerealsoprobedThemainconclusionsareasfollows：(1)Theremovalrateofammoniumbyzeolitizedflyashcouldreachthemaximumvalueof60％whenPhwasbetween7and9，anddecreasedoutofthepHrange，evenlowerthan25％Forphosphate，theminimumremovalr

8、ateofabout74％wasobtainedwithinthePHrangeof79，andtheremovalrateincreasedtoabout94％beyondthePHrangeItwasproposedthatthemechanismfortheremovalofammonmmfromwastewaterbyzeolitizedflyashwascationexchangeprocess，bothprecipitati

9、onandadsorptionforphosphate(2)SynthesizedzeolitewasefficienttopurifytheammoniumandphosphateinthedomesticwastewaterPhandtheconcentrationofammoniumandphosphateininfluenthadaneffectonthesimultaneousremovalofammoniumandphosp