黏土与粉煤灰吸附农村生活垃圾渗滤液的效能及机理

吴海霞; 吴小卉; 孟棒棒; 岳波; 禾海伶; 高红

doi:10.12153/j.issn.1674-991X.2019.05.140

黏土与粉煤灰吸附农村生活垃圾渗滤液的效能及机理

doi: 10.12153/j.issn.1674-991X.2019.05.140

吴海霞^1,2,
吴小卉¹,
孟棒棒¹,
岳波^1,*, ,,
禾海伶¹,
高红²

1.
中国环境科学研究院土壤与固体废物研究所,北京 100012
2.
昆明理工大学建筑工程学院,云南昆明 650500

详细信息

作者简介:
吴海霞(1994—),女,硕士研究生,研究方向为固体废物资源化利用, 1184512101@qq.com

通讯作者:
岳波 E-mail: yuebo@craes.org.cn

中图分类号: X705
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-20
- 刊出日期: 2019-09-20

Research on adsorption efficiency and mechanism of clay and coal fly ash for rural domestic waste leachate

1.
Research Institue of Solid Waste Management,Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2.
Faculty of Civil Engineering and Architectural,Kunming University of Science and Technology, Kunming 650500, China

More Information

Corresponding author: Bo YUE E-mail: yuebo@craes.org.cn

摘要

摘要: 分别以黏土和粉煤灰作为吸附剂,研究单一材料下吸附时间、吸附剂投加量和渗滤液初始pH对农村生活垃圾渗滤液吸附效能的影响及吸附机理。综合考虑去除效果、运行成本及可操作性,选择吸附时间为180 min、吸附剂投加量为50 g/L、渗滤液初始pH为自然值(7.5~8.0)作为实际运行工况。结果表明:黏土对农村生活垃圾渗滤液中化学需氧量(COD_Cr)、氨氮(NH₃-N)、总氮(TN)、总磷(TP)的去除率分别为25.58%、14.87%、41.63%和62.25%,粉煤灰为33.01%、18.18%、22.07%和60.46%;黏土对重金属Cr、As、Cd、Ni和Pb的去除率分别为13.04%、43.34%、60.24%、47.52%和61.77%,粉煤灰为10.53%、31.52%、84.30%、65.73%和68.65%。黏土和粉煤灰对渗滤液中污染物的等温吸附较符合Freundlich模型,化学吸附在多种吸附作用中占主导作用。
- 农村生活垃圾 /
- 渗滤液 /
- 黏土 /
- 粉煤灰 /
- 吸附效能 /
- 机理
Abstract: The effects of contact time, adsorbent dosage and initial pH on adsorption efficiency and its adsorption mechanism of clay and coal fly ash were investigated in batch experiments. Considering the removal effect, operation cost and maneuverability, the contact time of 180 min, adsorbent dosage of 50 g/L, initial leachate pH of natural value(7.5-8.0)were chosen as the actual operation condition. The results showed that under this condition, the removal rates of clay and coal fly ash for normal pollutants of rural domestic waste leachate (COD_Cr, NH₃-N, TN, TP) were 25.58% and 33.01%, 14.87% and 18.18%, 41.63% and 22.07%, 62.25% and 60.46%, respectively. The removal rates of clay and coal fly ash for heavy metals (Cr, As, Cd, Ni, Pb) were 13.04% and 10.53%, 43.34% and 31.52%, 60.24% and 84.30%, 47.52% and 65.73%, 61.77% and 68.65%, respectively. The isothermal dates of clay and coal fly ash for various pollutants in landfill leachate could be well described by the Freundlich adsorption model, and the chemisorption was the dominant mechanism.
- rural domestic waste /
- leachate /
- clay /
- coal fly ash /
- adsorption efficiency /
- mechanism

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