title: Treatment of soil eluate containing nitro aromatic compounds by adsorption on activated coke (AC).
abstract: Soil washing is a kind of physical method to remove organic matters from contaminated soil. However, its eluate after washing may result in secondary pollution to the environment. In this study, activated coke (AC) was used to remove organic pollutants from contaminated soil eluate. The effect of temperature, initial chemical oxygen demand (COD) and AC dosage on COD removal efficiency was investigated. The results showed that the organic matter can be removed in the eluate because the COD dropped a lot. When the AC dosage was 20 g·L(-1), 88.92% of COD decreased after 480 min of adsorption at 50 °C. The process of adsorption can be described by the Redlich-Peterson isotherm. The adsorption was spontaneous and endothermic. The pseudo-second-order model can be used to describe the adsorption process. After adsorption, the acute toxicity of the eluate was reduced by 76%, and the water qualities were in agreement with Chinese discharge standard GB 14470.1-2002, which means the eluate could be discharged to the environment.
authors.affiliation: Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China E-mail: zhengfangye@163.com.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Gansu Yinguang Chemical Industry Group Co., Ltd, No. 1 Yinguang Road, Baiyin, Gansu Province 730900, China.
authors.forename: Zhenming
authors.initials: Z
authors.lastname: Jiang
authors.affiliation: Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China E-mail: zhengfangye@163.com.
authors.forename: Quanlin
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Gansu Yinguang Chemical Industry Group Co., Ltd, No. 1 Yinguang Road, Baiyin, Gansu Province 730900, China.
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Gansu Yinguang Chemical Industry Group Co., Ltd, No. 1 Yinguang Road, Baiyin, Gansu Province 730900, China.
authors.forename: Hongping
authors.initials: H
authors.lastname: Su
authors.affiliation: Gansu Yinguang Chemical Industry Group Co., Ltd, No. 1 Yinguang Road, Baiyin, Gansu Province 730900, China.
authors.forename: Xuewen
authors.initials: X
authors.lastname: Gao
authors.affiliation: Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China E-mail: zhengfangye@163.com.
authors.forename: Zhengfang
authors.initials: Z
authors.lastname: Ye
mesh_terms: D000327:Adsorption; D057919:Biological Oxygen Demand Analysis; D003077:Coke / Q000032:analysis*; D009574:Nitro Compounds / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D003077:Coke; D009574:Nitro Compounds; D012987:Soil; D012989:Soil Pollutants