KMnO_4预氧化与混凝联合作用去除湖泊源水中Mn~(2+)的研究
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摘要
以外加Mn~(2+)湖水为研究对象,研究了KMnO_4预氧化与混凝去除湖泊源水中的Mn~(2+),考察了浊度、COD_(Mn)、p H、水中共存离子等水质参数以及混凝剂对除锰效率的影响,并探讨了预氧化产物新生态二氧化锰对混凝剂除浊投量的影响。结果表明:KMn O_4投量为理论值的83%或更低时剩余Mn~(2+)达标;KMnO_4与Mn~(2+)反应2 min内达到平衡;湖水COD_(Mn)变化对锰的去除率基本无影响;浊度对除锰有一定促进作用,但随着高锰酸钾投量增加逐渐减小;p H增大高锰酸钾对锰去除率上升,初始p H从6.54增加至9.57,95%锰去除率所需高锰酸钾投量从1.6 mg/L降低至0.8mg/L;Fe~(3+)/Al~(3+)离子混凝剂、HCO_3~-、H_2PO_4~-、SiO_3~(2-)对Mn~(2+)去除有一定影响;KMnO_4预氧化除Mn~(2+)产物水合二氧化锰可节省混凝除浊29%硫酸铝或43%聚合氯化铝铁投量。
The lake water with added Mn~(2+)was used as the research object,the effect of turbidity、COD_(Mn)、p H、coexisting ions and coagulants on Mn~(2+)removal by KMn O_4were investigated,the effect of coagulants dosage was also discussed while the new-formed manganese dioxide produced in the process of the pre-oxidation was existing.The result show that 95%or more Mn~(2+)has been removed when the dosage of KMn O_4was 83%or less of the calculated;the reaction between KMn O_4and Mn~(2+)quickly occurred and the balance achieved simultaneously in 2 min;The COD_(Mn)change of the lake water has less influence of on Mn~(2+)removal;The turbidity could promote Mn~(2+)removal rate,but the rate promoted by turbidity decreased as KMn O_4dosage increasing;Mn~(2+)removal rate was increasing as p H value increasing,initial p H value was 6.54 and 9.57,KMnO_4dosage of 95%Mn~(2+)removal was 1.6 mg/L and 0.8 mg/L separated;Fe~(3+)/Al~(3+)ion coagulants、HCO_3~-、H_2PO_4~-、SiO_3~(2-)has some influence on Mn~(2+)removal;Hydrated manganese dioxide could reduce 29%Al_2(SO_4)_3or 43%PAFC dosage for turbidity removal.
The lake water with added Mn~(2+)was used as the research object,the effect of turbidity、COD_(Mn)、p H、coexisting ions and coagulants on Mn~(2+)removal by KMn O_4were investigated,the effect of coagulants dosage was also discussed while the new-formed manganese dioxide produced in the process of the pre-oxidation was existing.The result show that 95%or more Mn~(2+)has been removed when the dosage of KMn O_4was 83%or less of the calculated;the reaction between KMn O_4and Mn~(2+)quickly occurred and the balance achieved simultaneously in 2 min;The COD_(Mn)change of the lake water has less influence of on Mn~(2+)removal;The turbidity could promote Mn~(2+)removal rate,but the rate promoted by turbidity decreased as KMn O_4dosage increasing;Mn~(2+)removal rate was increasing as p H value increasing,initial p H value was 6.54 and 9.57,KMnO_4dosage of 95%Mn~(2+)removal was 1.6 mg/L and 0.8 mg/L separated;Fe~(3+)/Al~(3+)ion coagulants、HCO_3~-、H_2PO_4~-、SiO_3~(2-)has some influence on Mn~(2+)removal;Hydrated manganese dioxide could reduce 29%Al_2(SO_4)_3or 43%PAFC dosage for turbidity removal.
引文
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[3]胡存丽,邵文.我国锰毒性研究现况[J].毒理学杂志,2000,14(3):185-187.
[4]刘凤娟,黄贤仪,张月明,等.锰对细胞免疫功能的影响[J].环境与职业医学,2002,19(3):139-142.
[5]DEMPERS C J N,BREED A W,HANSFORD G S.The kinetics of ferrous-iron oxidation by acidithiobacillus ferrooxidans,and leptospirillum ferrooxidans:effect of cell maintenance[J].Biochemical Engineering Journal,2003,16(3):337-346.
[6]U S ENVIRONMENTAL PROTECTION AGENCY,2012.2012Edition of the Drinking Water Standards and Health Advisories.Office of Water,U.S.Environmental Protection Agency,Washington,D.C.,USA.
[7]卫生部.生活饮用水卫生标准[J].GB 5749-2006.
[8]唐朝春,叶鑫,陈惠民,等.地下水除铁除锰技术与应用的研究进展[J].华东交通大学学报,2016(1):136-142.
[9]李冬,曾辉平,张杰.饮用水除铁除锰科学技术进展[J].给水排水,2011,37(6):7-13.
[10]陈季子.应用电位-p H图论述锰的主要化合物的氧化还原反应[J].北京邮电大学学报,1987(3):63-69.
[11]GOHARI R J,LAU W J,MATSUURA T,et al.Adsorptive removal of Pb(II)from aqueous solution by novel PES/HMO ultrafiltration mixed matrix membrane[J].Separation&Purification Technology,2013,120:59-68.
[12]黄一帆,于志红,廉菲,等.纳米二氧化锰对水中Cu2+和Cd2+的吸附特性[J].环境工程技术学报,2016(4):350-356.
[13]杨威.水合二氧化锰混凝去除水中微量金属镉[J].化学与粘合,2007,29(4):229-231.
[14]杨威,刘灿波,余敏,等.微污染水源水中重金属镉的去除[J].化工学报,2014,65(3):1076-1083.
[15]徐俊.强化混凝与吸附去除水中微量重金属小试研究[D].哈尔滨:哈尔滨工业大学,2007.
[16]SU Q,PAN B,WAN S,et al.Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead,cadmium,and zinc ions from water.[J].Journal of Colloid&Interface Science,2010,349(2):607.
[17]常青.水处理絮凝学[M].北京:化学工业出版社,2011.
[18]汤鸿霄.羟基聚合氯化铝的絮凝形态学[J].环境科学学报,1998,18(1):1-10.
[19]杨威,杨艳玲,李星,等.胶态水合二氧化锰絮凝粒子的结构形貌及其混凝机理[J].环境科学,2007,28(5):1050-1055.