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

Dewatered sewage sludge (DSS) and anaerobically digested sludge (ADS) were pyrolyzed at 550 °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 sl...

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Autores principales:	Jiaqi Zhao, Chunsheng Qiu, Xiaodan Fan, Jinxin Zheng, Nannan Liu, Chenchen Wang, Dong Wang, Shaopo Wang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	anaerobic digestion biochar chemical speciation heavy metals pyrolysis sewage sludge Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/1d713bd035e4422283d13b16fa836a07
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spelling	oai:doaj.org-article:1d713bd035e4422283d13b16fa836a072021-11-06T11:20:00ZChemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge0273-12231996-973210.2166/wst.2021.305https://doaj.org/article/1d713bd035e4422283d13b16fa836a072021-09-01T00:00:00Zhttp://wst.iwaponline.com/content/84/5/1079https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Dewatered sewage sludge (DSS) and anaerobically digested sludge (ADS) were pyrolyzed at 550 °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. 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 the 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 levels in the DSS and ADS to low risk and moderate levels 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 the unstable fraction decreased significantly after pyrolysis.; Pyrolysis treatment obviously alleviated the environmental risk of derived biochars.;Jiaqi ZhaoChunsheng QiuXiaodan FanJinxin ZhengNannan LiuChenchen WangDong WangShaopo WangIWA Publishingarticleanaerobic digestionbiocharchemical speciationheavy metalspyrolysissewage sludgeEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 5, Pp 1079-1089 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	anaerobic digestion biochar chemical speciation heavy metals pyrolysis sewage sludge Environmental technology. Sanitary engineering TD1-1066
spellingShingle	anaerobic digestion biochar chemical speciation heavy metals pyrolysis sewage sludge Environmental technology. Sanitary engineering TD1-1066 Jiaqi Zhao Chunsheng Qiu Xiaodan Fan Jinxin Zheng Nannan Liu Chenchen Wang Dong Wang Shaopo Wang Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
description	Dewatered sewage sludge (DSS) and anaerobically digested sludge (ADS) were pyrolyzed at 550 °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. 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 the 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 levels in the DSS and ADS to low risk and moderate levels 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 the unstable fraction decreased significantly after pyrolysis.; Pyrolysis treatment obviously alleviated the environmental risk of derived biochars.;
format	article
author	Jiaqi Zhao Chunsheng Qiu Xiaodan Fan Jinxin Zheng Nannan Liu Chenchen Wang Dong Wang Shaopo Wang
author_facet	Jiaqi Zhao Chunsheng Qiu Xiaodan Fan Jinxin Zheng Nannan Liu Chenchen Wang Dong Wang Shaopo Wang
author_sort	Jiaqi Zhao
title	Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
title_short	Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
title_full	Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
title_fullStr	Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
title_full_unstemmed	Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
title_sort	chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/1d713bd035e4422283d13b16fa836a07
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Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge

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