摘要
工业废水中高氯离子使其具有腐蚀性并妨碍水生动植物生长,破坏生态环境,在排放之前必须进行氯离子去除,达到排放要求。探究了单因素对氯离子去除率的影响,并讨论了投料比、搅拌时间、静置时间以及体系初始pH对去除率影响及交互作用。研究表明:搅拌速度为400 r/min, n(Al3+):n(Ca2+)为1:3.3,搅拌时间为30 min,静置时间为30 min,废水初始pH为10时,去除效果最佳。应用所得最佳条件对实际水样进行二次去除实验并探讨了相关影响因素。对实际水样二次氯离子去除实验的最佳工艺条件:当n(Cl-):n(Al3+):n(Ca2+)为1:3.6:12,初始溶液浓度为4 g/L时,并且需要在二阶段投加药品前调节体系pH值至弱碱性,氯离子去除效率可达95%,浓度可降到400 mg/L以下。通过X射线洐射分析可知,沉淀产物为层状结构的弗氏盐[Ca2Al(OH)6Cl·2H2O]。此方法成本低、无污染,对高氯废水去除有很好的应用价值。
The high chloride ion in industrial wastewater makes it corrosive and hinders the growth of aquatic animals and plants, destroys the ecological environment,and must be removed before discharge to meet emission requirements.The influence of single. factor on chloride removal rate was explored,and the effects of feed ratio,stirring time,standing time and initial pH on removal rate and interaction were discussed.The research shows that the stirring speed is 400 r/min, n(Al^3+):n(Ca^2+)is 1:3.3,the stirring time is 30min,the standing time is 30 min,and the initial pH of the wastewater is 10,the removal effect is best.The actual conditions were applied to the second water removal experiment and the relevant influencing factors were discussed.The optimum process conditions for the secondary chloride ion removal experiment of the actual water sample were that n(Cl^-):n(Al^3+):n(Ca^2+)is 1:3.6:12,and the initial solution concentration is 4g/L.It is also necessary to adjust the pH of the system to a weak alkaline before adding the drug in the second stage,the chloride ion removal efficiency can reach 95%,and the concentration can be reduced to below 400mg/L.X-ray diffraction analysis shows that the precipitated product is a layered structure of Freund's salt [Ca2Al(OH)6Cl·2H2O].This method has low cost and no pollution,and has good application value for high chlorine wastewater removal.
作者
唐宝玲
左松
陈胜文
顾卫星
王利军
TANG Baoling;ZUO Song;CHEN Shengwen;GU Weixing;WANG Lijun(School of Environmental and Materials Engineering,Shanghai Polytechnic University,Shanghai 201209,China;Shanghai Julang Environmental Protection Co.,Ltd.,Shanghai 201712,China)
出处
《上海第二工业大学学报》
2018年第4期255-262,共8页
Journal of Shanghai Polytechnic University
基金
上海市高原学科–环境科学与工程(资源循环科学与工程)
上海第二工业大学培育学科建设项目(EGD18YJ0029)
青浦区产学研合作发展资金项目(青产学研2018-48)资助
关键词
氧化钙
铝酸钠
氯离子
去除
废水处理
calcium oxide
sodium aluminate
chloride ion
remove
wastewater treatment
