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| DTC类重金属捕集剂对猪场废水中Cu、Zn的去除试验研究 |
| Removal of Cooper and Zinc from Swine Wastewater by DTC Chelator |
| 投稿时间：2015-03-12 |
| DOI：10.13254/j.jare.2015.0068 |
| 中文关键词: 猪场废水 DTC类捕集剂 铜 锌 |
| 英文关键词: swine wastewater dithiocarbamate chelator (DTC) cooper zinc |
| 基金项目:国家“十一五”科技支撑计划项目(2010BAD03B03);重庆市科技攻关重点项目(CSTC2009AB7027) |
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| 中文摘要: |
| 通过黄原酸化反应将二硫代氨基甲酸(DTC)基团引入至壳聚糖, 制备DTC类重金属捕集剂, 用以去除猪场废水Cu、Zn。结果表明, DTC类重金属捕集剂对Cu、Zn的捕集性能受废水初始pH值和捕集剂投加量的影响, pH值有一个适宜范围, 即pH 3.0~5.0;随着捕集剂投加量的增加, 去除效果逐渐增加, 但增加速率逐渐减缓。捕集剂性能受进水Cu、Zn浓度以及废水温度的干扰不很明显。在废水pH值5.0, 捕集剂投加量2.0 g·L-1(废水), 初始Cu、Zn浓度25~200 mg·L-1时, 捕集剂对Cu、Zn的去除率可达到99%以上, 且处理后Cu、Zn浓度低于污水综合排放标准(GB 8978—1996)一级标准限值规定。DTC类重金属捕集剂对Cu、Zn的等温吸附特征可用Langmuir方程进行拟合, 其吸附平衡时间约为20 min左右。 |
| 英文摘要: |
| The dithiocarbamate chelator (DTC) was prepared to remove Cu, Zn from swine wastewater by xanthic acid reaction of linking DTC-groups into chitosan. The results showed that the removal efficiency with DTC chelator was affected by initial pH value and the chelator amount added but had little affection from the initial concentration of Cu, Zn and temperature. The pH value had a suitable range from 3.0 to 5.0, and the removal efficiency gradually increased with DTC amount, but the increasing rate slowed down gradually. When the pH value was about 5, the added chelator amount was 2.0 g·L-1 (wasterwater), the initial concentrations of both Cu and Zn were 25~200 mg·L-1, the removal efficiency of Cu and Zn reached to 99%, and the concentrations of Cu and Zn in effluent were lower than those stipulated in the national standard (GB 8978—1996). Langmuir equation could well describe the isothermal adsorption process, and the equilibrium time was determined as 20 minutes by the kinetic process. |
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