鸟粪石结晶法回收垃圾渗滤液氨氮研究.pdf
第3卷第ll期环境工程学报
2009年11月ChineseJournalofEnvironmentalEngineerin
鸟粪石结晶法回收垃圾渗滤液氨氮研究
张记市王玉松
(1.山东轻工业学院轻化与环境工程学院,济南250353;2.日照市固体废物处理中心,日照276800)
摘要采用MgSO·7H:O和Na:HPO·12H:O使NH,一N生成MgNHPO·6H:0(鸟粪石)结晶沉淀法回收渗滤液
中NH3-N。考察了pH值、反应时间、药剂配比对NH-N去除率的影响。结果表明,鸟粪石结晶回收NH,一N反应的适宜pH
值为99.5之间,过高的pH会破坏鸟粪石晶体结构,导致固定氨从MgNHPO中游离出来,不利于氨氮的去除。在pH值
为9.5、反应时间为25min、Mg:Nn;:PO:一:1.5:1:1.5的最佳条件下,渗滤液中NH,一N浓度由初始3500mg/L,经结晶
沉淀后降低至175mg/L,去除率达95%。鸟粪石结晶沉淀过程中几乎不吸收重金属,同时回收了氨氮,其沉淀产物鸟粪石
是一种优良的缓释肥原料。
关键词填埋渗滤液氨氮鸟粪石结晶
中图分类号X703文献标识码A文章编号1673—9108(2009)11—2017—04
Struvitecrystallizationforrecoveringammonianitrogenfromlandfillleachate
ZhangJishi。WangYusong
(1.SchoolofLightChemistryandEnvironmentalEngineering,ShandongInstituteofLightIndustry,Jinan250353,China;
2.SolidWasteDisposalCenter,Rizhao276800,China)
AbstractAlab.scalestudywasconductedtoprecipitatetheammoniafromlandfillleachateinthefotinof
magnesiumammoniumphosphate(MAP)byapplyingsuchchemicalsasMgSO4‘7H2OandNa2HPO4‘12H20.
TheinfluencesofpHvalue,reactivetimeandconcentrationonremovalrateofammonianitrogenweretested.
ResultsshowedthatthefeasiblepHvaluesofcrystallizationandprecipitationwerebetween9and9.5.Thestruc.
tureofstruvitecrystallizationwasdestroyedunderhighpHvalueconditionresultedinammonianitrogendissocia-
tingfromMAP,whichreducedtheremovalrateofammonianitrogen.ResultsalSOdemonstratedthatammonia
nitrogenwaseffectivelyreducedrfominitial3500mg/Ltofinal175mg/L,whichremovalefficiencyreached
95%withcrystallizationandprecipitationmethodwhentheoptimalpH,precipitationtimemoleratioofMg“,
NH4+,POi—were9.5,25rainand1.5:1:1.5respectively.ResultsalsoshowedthatMAPhardlyabsorbedheav-
Ymetalduringstruviteandcrystallization,whichwasanexcellentfertilizer—controlledrelease.
Keywordslandfillleachate;