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1、第5卷第1期环境工程学报Vol.5,No.12011年1月ChineseJournalofEnvironmentalEngineeringJan.2011投药方式对鸟粪石法脱氮除磷的影响11*23杨鸿瑞朱洪光周雪飞张亚雷(1.同济大学现代农业科学与工程研究院生物质能源研究中心,上海200092;2.同济大学环境学院长江水环境教育部重点实验室,上海200092;3.同济大学污染控制与资源化国家重点实验室,上海200092)摘要鸟粪石法脱氮除磷过程中,投药方式对反应产生很大影响。以MgCl26H2O和Na2HPO412H2O为沉淀剂进行脱氮除磷的实验
2、研究,结果表明,药剂的投加顺序影响不大,加药速度以缓慢加药为宜,pH值调节时机对氮磷的去除率影响很大,pH值调节时机由前调改为后调,氨氮的去除率由70%左右提高至80%~85%,磷的去除率由60%左右提高至80%左右。综合比较技术经济性,认为当氨氮和磷含量较低时,可采用前调pH值,对于高氨氮和磷废水,适于后调pH值。关键词鸟粪石脱氮除磷投药方式pH值调节时机技术经济性中图分类号X7031文献标识码A文章编号1673-9108(2011)01-0055-05Influenceofagentaddingmodeonammoniaandpho
3、sphorousremovalthroughstruviteprecipitation1123YangHongruiZhuHongguangZhouXuefeiZhangYalei(1.Bio-EnergyResearchCenter,ModernAgriculturalScienceandEngineeringResearchInstitute,TongjiUniversity,Shanghai200092,China;2.KeyLaboratoryofYangtzeWaterEnvironment,MinistryofEducation,TongjiU
4、niversity,Shanghai200092,China;3.StateKeyLaboratoryofPollutionControlandResourcesReuse,TongjiUniversity,Shanghai200092,China)AbstractTheagentaddingmodehasasignificantimpactonstruviteprecipitationreactiontoremoveam-moniaandphosphorus.Thepaperfocusedonammoniaandphosphorusremovalthroug
5、hstruviteprecipitationwithMgCl26H2OandNa2HPO412H2Oasprecipitants.Theresultsshowedthatagentaddingorderhadlittleeffectandtheslowdosingspeedwasbetterforreaction.AlsothepHadjustmenttimingaffectedtheammoniaandphosphorusremovalefficiencygreatly.WhenadjustingpHafterdosinginsteadofbefore,t
6、heammoniaremovalratewasenhancedfromapproximately70%to80%~85%,andtheremovalrateofphosphorusincreasedfromabout60%toabout80%.BycomparingtechnicaleconomybetweendifferentpHadjustmenttimingcomprehen-sively,itwassuitableforadjustingpHbeforedosingwhenammoniaandphosphoruscontentwaslow,whilead
7、-justingpHafterdoisingforhighammoniaandphosphorusconten.tKeywordsstruvite;ammoniaandphosphorousremova;lagentaddingmode;pHadjustmenttiming;technicaleconomy以鸟粪石沉淀的形式回收废水中的磷被国外环阶段,尚待完善。境工作者和企业家公认为一种最有希望的技术方鸟粪石即六水合磷酸铵镁(MgNH4PO4[1]法。该方法还可以同时回收氮资源,减少氮磷对6H2O),是一种白色晶体,易溶于酸性溶液,不溶于水体环境的危害,
8、回收的鸟粪石沉淀可以作为