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《Environmental Science & Technology》 2012-12
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Removing Algaecide Byproduct Chlorite by Ferrous Salt

LI Shao-xiu1,XIA Wen-qin1,ZHAO De-jun2,YUAN Xiu-li2, WANG Zhi-hong1,LI Dong-mei1,XIE Bao-hong2(1.Faculty of Civil and Traffic Engineering,Guangdong University of Technology,Guangzhou 510006,China; 2.Guangzhou Project Center for Water Engineering and Management,Guangzhou 510640,China)  
An experimental study is conducted relating to the drinking water treatment process with raw water abstracted from a reservoir,during which ClO2,a sort of algaecide,has been used and as a result the byproduct,i.e.chlorite produced.The study focuses on removing chlorite,the by-product,by using FeSO4 that remove chlorite at the same time reacts with ClO2.In the case of the time interval between addition of ClO2 and FeSO4 being relatively short,the dosage of FeSO4 is determined according to the stoichiometric relation of the dosage reacting with 70% of the initial dosage of ClO2,thus chlorite in the water can be totally removed.Being able to enhance turbidity-removing,FeSO4,when added,reduces amount of the coagulant conventionally applied in water treatment;it has been proved that no more conventional coagulant is needed when turbidity is 23.3NTU or 24.3 NTU.In fact,FeSO4 is characterized with a synergetic effect of removing algae and turbidity.
【Fund】: 2011年度广州市水务科技项目
【CateGory Index】: TU991.263
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