生物炭
热解
污水污泥
吸附
化学
金属
浸出(土壤学)
环境化学
镉
活性炭
废物管理
重金属
制浆造纸工业
化学工程
污水处理
环境科学
土壤水分
有机化学
土壤科学
工程类
作者
Tan Chen,Yaxin Zhang,Hongtao Wang,Wenjing Lü,Zeyu Zhou,Yuancheng Zhang,Lulu Ren
标识
DOI:10.1016/j.biortech.2014.04.048
摘要
To investigate systematically the influence of pyrolysis temperature on properties and heavy metal adsorption potential of municipal sludge biochar, biophysical dried sludge was pyrolyzed under temperature varying from 500 °C to 900 °C. The biochar yield decreased with the increase in pyrolysis temperature, while the ash content retained mostly, thus transforming the biochars into alkaline. The structure became porous as the temperature increased, and the concentrations of surface functional group elements remained low. Despite the comparatively high content of heavy metal in the biochar, the leaching toxicity of biochars was no more than 20% of the Chinese standard. In the batch experiments of cadmium(II) adsorption, the removal capacity of biochars improved under higher temperature, especially at 800 °C and 900 °C even one order of magnitude higher than that of the commercial activated carbon. For both energy recovery and heavy metal removal, the optimal pyrolysis temperature is 900 °C.
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