Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第7期    总第160期    2012年7月

[PDF全文下载]        

    

文章编号:1004-0609(2012)07-2125-08
微电解−絮凝耦合技术处理含重金属铅锌冶炼废水
杨津津,徐晓军,王  刚,王  盼,韩振宇,管堂珍,田  蕊

(昆明理工大学 环境科学与工程学院,昆明 650093)

摘 要: 采用“石灰中和−曝气微电解−絮凝沉淀法”技术处理含重金属铅锌冶炼废水,考察微电解进水pH值、水力停留时间、铁炭质量比、絮凝pH值和助凝剂用量等反应条件对废水中铅、锌、镉、铜和砷离子去除率的影响。采用扫描电镜(SEM)和能谱(EDS)等测试手段,研究微电解反应前后铁屑和活性炭的表面形貌及物质组成的变化,分析铁炭微电解原理及铁炭床失效原因。结果表明:在微电解铁炭质量比为1:1.5、进水初始pH值为2.5、水力停留时间为40 min、絮凝pH值为11、助凝剂PAM用量为4×10−6(质量分数)的条件下,微电解−絮凝耦合技术对废水中各离子的去除效果最佳,Cd2+出水浓度达到了《污水综合排放标准》(GB8978-1996)中的一级标准,Pb2+、Cu2+、Zn2+和总砷的出水浓度满足《地表水环境质量标准》(GB 3838-2002)中Ⅲ类水标准。

 

关键字: 重金属;铅;锌;砷;微电解;絮凝;冶炼废水

Treatment of zinc and lead smelting wastewater containing heavy metals by combined process of micro-electrolysis with flocculation
YANG Jin-jin, XU Xiao-jun, WANG Gang, WANG Pan, HAN Zhen-yu, GUAN Tang-zhen, TIAN Rui

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China

Abstract:The combined process of “lime neutralization-micro-electrolysis-flocculation” was used to treat lead and zinc smelting wastewater containing heavy metal ions. The influence of the experimental conditions on the removal rate of Pb2+, Zn2+, Cd2+, Cu2+ and As ions in the wastewater was also investigated. The experimental conditions included the mass ratio of Fe to C, initial pH of the infall wastewater, and hydraulic retention time for the micro-electrolysis reactions, and pH and dosage of PAM flocculant for following flocculation reactions. The morphology and compositions of the carbon and iron surface were also characterized by SEM and EDS before and after the treatment of the micro-electrolysis reaction, the reaction mechanism of Fe/C micro-electrolysis and the invalidation cause of Fe/C wadding were analyzed. The results show that the optimal conditions of the micro-electrolysis-flocculation are the mass ratio of Fe to C of 1:1.5, initial pH 2.5 and reaction time 40 min for the micro-electrolysis reactions, and pH 11 and dosage of PAM of 4×10−6 (mass fraction) for flocculation reaction, under which the combined technique has the highest removal efficiency for the heavy metal ions in this wastewater. Cd2+concentration in the outlet wastewater satisfies the primary standard in 《Integrated Wastewater Discharge Standard》(GB8978-1996) in China, and the concentrations of Pb2+, Zn2+, Cu2+ and As ions satisfy the Ⅲ surface water standard of《Environmental Quality Standard for Surface Water》(GB 3838-2002) in China.

 

Key words: heavy metal; lead; zinc; arsenic; micro-electrolysis; flocculation; smelting wastewater

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com