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Effect of different flocculants on the characteristics of hydrochar and hydroliquid derived from the hydrothermal treated active sludge. A comparative study

文献类型： 外文期刊

作者： Qi, Gaoxiang 1 ; Wang, Xiaobo 4 ; Shen, Yu 4 ; Liu, Xuecheng 1 ; Alam, Md Asraful 5 ; Liu, Biyan 3 ; Chen, Yucheng 1 ;

作者机构： 1.Southwest Univ, Coll Resource & Environm, Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400715, Peoples R China

2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

3.Chongqing Feearth Environm Technol Co Ltd, Chongqing 400067, Peoples R China

4.Chongqing Technol & Business Univ, Natl Res Base Intelligent Mfg Serv, Chongqing 400067, Peoples R China

5.Zhengzhou Univ, Sch Chem Engn, Zhengzhou 450001, Peoples R China

关键词： Flocculants; Sewage sludge; Hydrothermal carbonization; Hydrochar; Elements transformation

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： In this study, the effect of flocculants on the physicochemical properties of hydrochar and hydroliquid derived from hydrothermal carbonization (HTC) treated sewage sludge (SS) was investigated. The results suggested that the flocculants including polyacrylamides (PAM), polyaluminium chloride (PAC) and FeCl3 can be transferred from the liquid to hydrochar during the HTC treatment process. The PAM monomers produced from thermal degradation can be absorbed on hydrochar. The Al3+ and Fe3+ in hydrochars were in the form of oxides, hydroxides or salts. The transformation of N, S and P during HTC can be affected by the flocculants, and the thermochemical properties of the derived hydrochars exhibited obvious difference. The influence mechanisms on elements transformation can be attributed to phosphate precipitation by metal ions, pH change caused by flocculants hydrolysis and catalysis of the ions. The thermal release of hydrocarbon and N/S containing gases from the three kinds of hydrochars with PAM, PAC and FeCl3 addition demonstrated significant differences. The hydrocarbon released from hydrochar with PAC addition was much lower than the other groups, while the hydrochar with FeCl3 addition exhibited improved S containing gases release. In addition, the water quality parameter, especially total phosphorus (TP) concentration was affected by flocculants. Phosphorus can be enriched in hydrochar by PAC with 95.1% of TP kept in hydrochar. The volatile organics including fatty acids, alkanes, ketones, aldehydes, amides and pyrazines in the liquid phase were also affected by flocculants. The obtained results in this study will provide valuable information for SS utilization by HTC treatment.

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