Pyrolysis temperature regulates sludge-derived biochar production, phosphate adsorption and phosphate retention in soil

文献类型： 外文期刊

第一作者： Liang, Jinsong

作者： Liang, Jinsong;Ye, Junpei;Shi, Chuan;Zhang, Panyue;Zubair, Mohammad;Chang, Jianning;Zhang, Lian;Liang, Jinsong;Zhang, Panyue;Chang, Jianning;Zhang, Lian;Ye, Junpei;Shi, Chuan;Guo, Jianbin;Zubair, Mohammad

作者机构：

关键词： Sewage sludge-derived biochar; Pyrolysis temperature; Phosphate; Metal oxide; Exchangeable Mg; Phosphate retention

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.968； 五年影响因子：7.317 ）

ISSN： 2213-2929

年卷期： 2022 年 10 卷 3 期

页码：

收录情况： SCI

摘要： Biochar production from sewage sludge for phosphate adsorption provides a new route for treatment and reutilization of sewage sludge. The effect of pyrolysis temperature from 300 to 750 degrees C on sludge-derived biochar properties and their phosphate adsorption capacities were investigated. The biochar production decreased with increasing the pyrolysis temperature because of the loss of element C, H, and N during pyrolysis process. Ca, Mg, Al, Fe, and heavy metals (Cu, Zn, Ni, and Pb) were accumulated with increasing pyrolysis temperature. The sludge-derived biochar prepared at 300 degrees C was acidic while those at a pyrolysis temperature higher than 300 degrees C were alkaline. Increasing pyrolysis temperature led to fewer aliphatic functional groups and more aromatic structures in sludge-derived biochar. Phosphate adsorption capability increased with increasing pyrolysis temperature, and the maximum adsorption capability was 5.93 mg/g (as P) when the pyrolysis temperature was 700 degrees C. The adsorption results were excellently fitted by Langmuir model, and monolayer phosphate adsorption capability of B700 was 5.469 mg/g. Change in surface area, charge, and functional groups were not the key reasons for enhancing the phosphate adsorption by sludge-derived biochar. The precipitation of phosphate with exchangeable Mg might be the dominating mechanism for phosphate adsorption due to a high exchangeable Mg content of 512.9 mmol/kg at 700 degrees C. After soil column leaching for 42 d, the cumulative phosphate leaching loss with 3% B700 was only 20.60 mu g/g, realizing an excellent effect of phosphate retention. These findings provide the theoretical basis for sewage sludge recycling as soil amendment.

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