文献类型：期刊文献

英文题名：Decrease of dissolved sulfide in sewage by powdered natural magnetite and hematite

作者：Zhang, Lehua[1,2];Verstraete, Willy[2];Mendoza, Maria de Lourdes[2,3];Lu, Zhihao[1];Liu, Yongdi[1];Huang, Guangtuan[1];Cai, Lankun[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Univ Ghent, Lab Microbial Ecol & Technol LabMET, Coupure Links 653, B-9000 Ghent, Belgium;[3]Super Polytech Sch Coast ESPOL, Dept Chem & Environm Sci, Guayaquil 090112, Ecuador

年份：2016

卷号：573

起止页码：1070

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20163702791841);WOS:【SCI-EXPANDED(收录号:WOS:000390071000104)】；

基金：This work is supported by the National Natural Science Foundation of China (Grant No. 20906026) and Shanghai Pujiang Program (Grant No. 09PJ1402900).

语种：英文

外文关键词：Concrete pipe corrosion; Hematite; Magnetite; Sulfide decrease; Municipal sewage

摘要：Natural magnetite and hematite were explored to decrease sulfide in sewage, compared with iron salts (FeCl3 and FeSO4). A particle size of magnetite and hematite ranging from 45 to 60 pm was used. The results showed that 40 mg L-1 of powdered magnetite and hematite addition decreased-the sulfide in sewage by 79%and 70%, respectively. The achieved decrease of sulfide production capacities were 1973, 210.6, 317.6 and 2833 mg S g(-1)Fe for magnetite, hematite, FeCl3 and FeSO4 at the optimal dosage of 40 mg L-1, respectively. Magnetite and hematite provided a higher decrease of sulfide production since more iron ions are capable of being released from the solid phase, not because of adsorption capacity of per gram iron. Besides, the impact on pH and oxidation-reduction potential (ORP) of hematite addition was negligible; while magnetite addition resulted in slight increase of 0.3-0.5 on pH and 10-40 mV on ORP. Powdered magnetite and hematite thus appear to be suitable for sulfide decrease in sewage, for their sparing solubility, sustained-release, long reactive time in sewage as well as cost-effectiveness, compared with iron salts. Further investigation over long time periods, under practical conditions are needed to evaluate the possible settlement in sewers and unwanted (toxic) metal elements presenting as impurities. Capsule abstract: Powdered magnetite and hematite were more cost-effective at only 30% costs of iron salts, such as FeCl3 and FeSO4 for decreasing sulfide production in sewage. (C) 2016 Published by Elsevier B.V.