Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge

被引:10
作者
Zhao, Jiaqi [1 ]
Qiu, Chunsheng [1 ,2 ]
Fan, Xiaodan [1 ,2 ]
Zheng, Jinxin [1 ]
Liu, Nannan [1 ,2 ]
Wang, Chenchen [1 ,2 ]
Wang, Dong [1 ,2 ]
Wang, Shaopo [1 ,2 ]
机构
[1] Tianjin Chengjian Univ, Sch Environm & Municipal Engn, Tianjin 300384, Peoples R China
[2] Tianjin Key Lab Aqueous Sci & Technol, Tianjin 300384, Peoples R China
基金
中国国家自然科学基金;
关键词
anaerobic digestion; biochar; chemical speciation; heavy metals; pyrolysis; sewage sludge; MUNICIPAL SOLID-WASTE; PYROLYSIS TEMPERATURE; LIQUEFACTION; MECHANISMS; RESIDUES; WATER; SOIL;
D O I
10.2166/wst.2021.305
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The dewatered sewage sludge (DSS) and anaerobically digested sludge (ADS) were pyrolyzed at 550 degrees C to investigate the characteristics of derived biochar and evaluate the risk of heavy metals (Cr, Ni, Cu, As, Cd, and Pb). The results showed that the pH value of the biochar derived from DSS (DSS-C) was slightly lower than that of the biochar derived from ADS (ADS-C), while DSS-C presented relatively higher specific surface area and total pore volume. DSS-C also showed higher H/C and lower O/C ratios than ADS-C, indicating a higher aromatic condensation and a lower polarity. And the total concentrations of Cr, Ni, Cu, As, Cd, and Pb in DSS and ADS increased significantly after pyrolysis owing to the thermal decomposition of organic matter in the sludge, with corresponding rise of the Nemerow pollution index (NPI) of the biochars compared with the raw sludge. In addition, the sequential extraction procedure (BCR) analysis revealed that pyrolysis process promoted the transformation of heavy metals from bio-available fractions to stable fractions. The potential environmental risk of heavy metals decreased from moderate and extremely high level in the DSS and ADS to low risk and moderate level in DSS-C and ADS-C after pyrolysis, respectively. HIGHLIGHTS Sewage sludge and anaerobically digested sludge were pyrolyzed to produce biochar. Heavy metals Cr, Ni, Cu, As, Cd, and Pb were concentrated in the derived biochars. Proportions of heavy metals in unstable fraction decreased significantly after pyrolysis. Pyrolysis treatment obviously alleviated the environmental risk of derived biochars.
引用
收藏
页码:1079 / 1089
页数:11
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