磁性生物炭对重金属污染废水处理条件优化及机理

被引：59

作者：

杜文琪

曹玮

周航

杨文弢

辜娇峰

彭佩钦

张平

廖柏寒

机构：

[1] 中南林业科技大学环境科学与工程学院

来源：

环境科学学报 | 2018年 / 38卷 / 02期

关键词：

磁性谷壳生物炭; Cd2+和Zn2+; 正交实验; 吸附; 重金属污染废水;

D O I：

10.13671/j.hjkxxb.2017.0355

中图分类号：

X703 [废水的处理与利用];

学科分类号：

083001 [环境科学];

摘要：

将水稻谷壳经改性和负磁后制得磁性谷壳生物炭（BC-Fe）,通过正交实验研究了pH、生物炭添加量、吸附时间和转速对磁性谷壳生物炭吸附实际污染废水中Cd2+和Zn2+的影响,提出了磁性谷壳生物炭作为实际污染废水处理材料的最佳操作条件,并应用于多步骤废水处理系统中,同时进行了BC-Fe的再生吸附实验.正交实验结果表明,在pH为6.0、固液比为6.0 g·L-1、吸附时间为1.0 h、转速为160 r·min-1的条件下,磁性谷壳生物炭对Cd2+和Zn2+的去除率最高,分别达到61.1%和60.4%,吸附量分别为8.6 mg·g-1和21.3 mg·g-1.在实验所设条件下,Cd2+和Zn2+的综合去除效果随着pH和生物炭添加量的增加而显著升高,吸附时间和转速的影响未达显著水平.在多步骤废水处理系统中,使用CaO和Na2S作为前处理,利用磁性谷壳生物炭二次处理,可使实际污染废水中Cd2+、Zn2+、Pb2+、Mn2+、Fe2+的去除率分别达到100%、99.8%、99.3%、97.8%、100%,SS降为1.0 mg·L-1,此时系统pH为7.5,色度为2倍,出水各项指标均达到硫酸工业污染物排放标准（GB 26132—2010）和污水综合排放标准（GB 8978—1996）的要求.再生实验表明,BC-Fe第3次吸附Cd2+和Zn2+的去除率分别为50.6%和49.1%,吸附材料再生性能良好.

引用

页码：492 / 500

页数：9

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