| .6种湿地填料对含铅废水中铅吸附作用的比较研究[J].农业环境科学学报,2013,32(3):. |
| 6种湿地填料对含铅废水中铅吸附作用的比较研究 |
| Evaluating the Lead Adsorption Performance of Six Wetlands Substrates in Wastewater Treatment |
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| DOI：10.11654/jaes.2013.03.034 |
| 中文关键词: 湿地填料 含铅废水 吸附作用 |
| 英文关键词: substrates of wetlands wastewater containing lead adsorption performance |
| 基金项目: |
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| 摘要点击次数: 1833 |
| 全文下载次数: 1853 |
| 中文摘要: |
| 为评价人工湿地常用填料对含铅废水中铅的吸附作用，并在此基础上为利用湿地处理特殊重金属废水筛选出更为适用的湿地填料，研究了沸石、砾石、磁铁矿石、陶粒、石英砂和膨胀珍珠岩六种湿地填料对废水中铅的吸附作用。结果表明：当废水中Pb2+浓度为200 mg·L-1时，各填料对废水中Pb2+的吸附能力依次为沸石>磁铁矿石>砾石>石英砂>膨胀珍珠岩>陶粒，其中经磁铁矿石和沸石吸附处理后出水中Pb2+能够达到《污水综合排放标准》（GB 8978—1996）（≤1.0 mg·L-1）。沸石、磁铁矿石和砾石对铅的等温吸附曲线表明，沸石对铅的吸附容量较砾石和磁铁矿石大。综合考虑吸附效果和经济性能，认为采用砾石作为人工湿地处理废水中Pb2+的填料，同时在砾石中掺入一定量沸石可以提高湿地填料的吸附效果。 |
| 英文摘要: |
| Constructed wetlands are widely used as sewage ecological treatment technology for the treatment of domestic sewage, industrial wastewater, mining and oil exploitation wastewater. In this research, we evaluate Pb2+ adsorption performance of wetlands substrates in wastewater containing lead and screened out suitable wetlands substrates to treat special heavy metal wastewater, absorption of lead on the substrates of zeolite, gravel, magnetite, haydite, quartz sand and pearlite were evaluated. The results showed that the zeolite, magnetic iron ore and gravel had good removal effects：the removal rate of zeolite and magnetic iron ore were up to 99% and the removal rate of gravel was above 92% at Pb2+ concentration of 200 mg·L-1. The Pb2+ adsorption abilities followed as：zeolite>magnetite>gravel>quartz sand>perlite> haydite. Pb2+ concentration in wastewater treated by magnetite and zeolite could meet the integrated wastewater discharge standard（GB 8978—1996）（≤1.0 mg·L-1）. Adsorption of Pb2+ on zeolite, magnetic iron ore and gravel followed well the Langmuir equation , while the Freundlich equation is more suitable for descripting the Isothermal adsorption of magnetic iron ore. The adsorption capacity of zeolite to Pb2+ was higher than magnetic iron ore and gravel. On taking the adsorption effect and economic performance into consideration, gravel is the best wetlands substrates for the treatment of Pb2+ in wastewater, and the adsorption effect can be further improved by adding certain amount of zeolite. |
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