| 重金属捕集剂对水中微量Hg(Ⅱ)的处理研究 |
| 摘要点击 3140 全文点击 1533 投稿时间：2012-12-26 修订日期：2013-03-11 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 DTCR-2 重金属捕集剂 微量Hg(Ⅱ) 螯合沉淀 排放标准 |
| 英文关键词 dithiocarbamate (DTCR-2) heavy metal capturing agent low-level Hg(Ⅱ) chelating precipitation discharge standard |
|
| 中文摘要 |
| 针对含汞废水采用常规处理难以达标的问题,选用二硫代氨基甲酸盐类(DTCR-2)、2,4,6-三硫醇基钠硫代三嗪(TMT-18B)、硫化钠(Na2S)和氢氧化钙[Ca(OH)2]作为重金属捕集剂,对水中微量Hg2+进行深度处理研究. 通过处理效果的对比,最终选用DTCR-2作为Hg2+最理想的捕集剂,重点考察了pH值、DTCR-2投加量、反应时间、Hg2+初始浓度及其他重金属离子等因素对Hg2+去除效果的影响. 结果表明,在Hg2+初始浓度为100 μg ·L-1,pH为8.0,投加量1.0倍化学计量比,反应时间10 min时处理效果较好,Hg2+剩余浓度为41.36 μg ·L-1,低于国家排放标准中的限值(50 μg ·L-1). 另外,Cd2+、Pb2+、Cu2+这3种重金属离子对DTCR-2去除Hg2+具有抑制作用,影响大小依次为Cu2+>Pb2+>Cd2+,而Zn2+具有促进作用. 通过本研究,可以为DTCR-2处理低浓度含汞废水工艺设计提供理论支持. |
| 英文摘要 |
| Treatment of mercury containing wastewater using conventional approach is considered to be difficult to bring down its concentration to meet the discharge standard. In this study, we utilized dithiocarbamate (DTCR-2), 2,4,6-trimercaptotriazine(TMT-18B), Na2S and Ca(OH)2 as the advanced treatment agents to remove low-level Hg2+ from water. Due to its better treatment effect, DTCR-2 was finally chosen as the most ideal option. The influence of pH value, dosage of DTCR-2, reaction time, initial Hg2+ concentration as well as other heavy metal ions on the Hg2+ removal were studied. The results showed that DTCR-2 had high removal efficiency under the following conditions: 100 μg ·L-1 of initial Hg2+concentration, pH 8.0, 1.0 times stoichiometric ratio of DTCR-2 dosage and 10 min of reaction time, leading to 41.36 μg ·L-1 of residual Hg2+concentration which was below the national discharge standard (50 μg ·L-1). Moreover, three heavy metal ions including Cd2+, Pb2+ and Cu2+, inhibited the DTCR-2 capturing capacity towards Hg2+ and the inhibition effects followed this order: Cu2+>Pb2+>Cd2+, while Zn2+ promoted the Hg2+removal. From this study, we could provide theoretical support for process design to deal with wastewater containing low mercury concentration using DTCR-2. |
|
|
|
