Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between t...

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Autores principales:	Chunsheng Qiu, Jinxin Zheng, Chenchen Wang, Bingbing Wang, Nannan Liu, Dong Wang, Shaopo Wang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	chemical speciation ecological risk assessment heavy metals microwave sewage sludge Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/de7f3b8d426e410ab5d1713c5819d487
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spelling	oai:doaj.org-article:de7f3b8d426e410ab5d1713c5819d4872021-11-06T11:18:22ZMigration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge0273-12231996-973210.2166/wst.2021.272https://doaj.org/article/de7f3b8d426e410ab5d1713c5819d4872021-08-01T00:00:00Zhttp://wst.iwaponline.com/content/84/4/917https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solids, was also explored. The results showed that the migration of heavy metals between solid–liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilisation of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through Fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C. HIGHLIGHTS Effect of microwave treatment on heavy metals speciation in sludge was reported.; The metal halides related to organic and inorganic compounds were observed.; NH4+-N showed the greatest correlation to the bio-availability of most heavy metals.; Environmental risk of treated sludge after microwave treatment was alleviated.;Chunsheng QiuJinxin ZhengChenchen WangBingbing WangNannan LiuDong WangShaopo WangIWA Publishingarticlechemical speciationecological risk assessmentheavy metalsmicrowavesewage sludgeEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 4, Pp 917-930 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chemical speciation ecological risk assessment heavy metals microwave sewage sludge Environmental technology. Sanitary engineering TD1-1066
spellingShingle	chemical speciation ecological risk assessment heavy metals microwave sewage sludge Environmental technology. Sanitary engineering TD1-1066 Chunsheng Qiu Jinxin Zheng Chenchen Wang Bingbing Wang Nannan Liu Dong Wang Shaopo Wang Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
description	The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solids, was also explored. The results showed that the migration of heavy metals between solid–liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilisation of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through Fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C. HIGHLIGHTS Effect of microwave treatment on heavy metals speciation in sludge was reported.; The metal halides related to organic and inorganic compounds were observed.; NH4+-N showed the greatest correlation to the bio-availability of most heavy metals.; Environmental risk of treated sludge after microwave treatment was alleviated.;
format	article
author	Chunsheng Qiu Jinxin Zheng Chenchen Wang Bingbing Wang Nannan Liu Dong Wang Shaopo Wang
author_facet	Chunsheng Qiu Jinxin Zheng Chenchen Wang Bingbing Wang Nannan Liu Dong Wang Shaopo Wang
author_sort	Chunsheng Qiu
title	Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
title_short	Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
title_full	Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
title_fullStr	Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
title_full_unstemmed	Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
title_sort	migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/de7f3b8d426e410ab5d1713c5819d487
work_keys_str_mv	AT chunshengqiu migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT jinxinzheng migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT chenchenwang migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT bingbingwang migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT nannanliu migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT dongwang migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge AT shaopowang migrationandtransformationofheavymetalsduringthemicrowaveassistedthermalhydrolysisofsewagesludge
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Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

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