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时间:2020-03-25
《不同氨氮浓度对混凝_超滤组合工艺水质处理效果及膜通量.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第7卷第1期环境工程学报Vol.7,No.12013年1月ChineseJournalofEnvironmentalEngineeringJan.2013不同氨氮浓度对混凝-超滤组合工艺水质处理效果及膜通量的影响1,22,3*13322林佳琪刘百仓郭劲松黄尔杨国洪张梦然刘彩虹(1.重庆大学城市建设与环境工程学院,重庆400045;2.四川大学建筑与环境学院,成都610065;3.四川大学水力学与山区河流开发保护国家重点实验室,成都610065)摘要我国地表水源污染物中氨氮是普遍存在的,且难以处理,实验选择混凝-超滤组合工艺,腐殖酸为NOM的代表物,
2、通过考察污染物中氨氮不同含量水平的变化,考察氨氮含量对出水水质、通量下降和污染类型这3个方面的影响。结果表明,在给定实验条件下,氨氮含量由0.1mg/L增大至0.5mg/L时,加快了污染物在膜表面的沉积,最终导致出水有机物含量降低。PVDF和PVC膜的TOC去除率分别提高17.31%和23.21%,UV254去除率分别提高2.78%和11.72%,膜组件通量分别下降了3.51%和10.17%。考察膜污染类型,发现氨氮促进了标准孔堵塞和滤饼层形成,同时削弱完全孔堵塞和中间孔堵塞。关键词氨氮超滤膜通量污染类型中图分类号X703.1文献标识码A文章编号1
3、673-9108(2013)01-0113-06Organicmatterremovalandfluxvariationinfluencedbyammonianitrogenincoagulation-ultrafiltrationcombinedprocess1,22,3133LinJiaqiLiuBaicangGuoJinsongHuangErYangGuohong22ZhangMengranLiuCaihong(1.FacultyofUrbanConstructionandEnvironmentalEngineering,ChongqingU
4、niversity,Chongqing400045,China;2.CollegeofArchitectureandEnvironment,SichuanUniversity,Chengdu610065,China;3.StateKeyLaboratoryofHydraulicsandMountainRiverEngineering,SichuanUniversity,Chengdu610065,China)AbstractItiscommonthatammonianitrogenexistsinthesurfacewateranditisdiff
5、iculttotreat.Duringthecoagulation-ultrafiltrationcombinedprocess,whilethehumicacidwaschosenastherepresentativeofNOM,effectofdifferentammonianitrogenconcentrationonorganicmatterremovalwerestudied,includingtreatedwa-ter’squality,fluxdeclineandmembrane’sblockinglaw.Theresultsshow
6、edthatafterincreasingthedoseofammoniafrom0.1mg/Lto0.5mg/L,electrostaticrepulsionwasreduced,whichacceleratedthedepositionofcontaminantsonthemembranesurface.Ammoniacaneventuallyleadtothedecreaseoforganicmatter’scon-centration.TheTOCremovalratesofPVDFandPVCmembraneincreaseby17.31
7、%and23.21%,respectivelyandtheirUV254removalratesincreaseby2.78%and11.72%,respectively.Itmakesthemembranefluxde-creasingmorerapidly,andthusfavorstheformationofstandardblockingandthecakelayer,whilereducingthecompleteblockingandintermediateblockingsimultaneously.Keywordsammoniani
8、trogen;ultrafiltration;membraneflux;blockinglaw[1-3]天然有机物腐殖酸的
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