Speciation and environmental risk assessment of heavy metal in bio-oil from liquefaction/pyrolysis of sewage sludge

Yuan, Xingzhong; Leng, Lijian; Huang, Huajun; Chen, Xiaohong; Wang, Hou; Xiao, Zhihua; Zhai, Yuanzheng; Chen, Hongmei; Zeng, Guangming

doi:10.1016/j.chemosphere.2014.10.010

Cited by 116 publications

(53 citation statements)

References 35 publications

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“…18,31 (1) The risk assessment code (RAC) can be used to indicate the heavy metal contamination intensity in the sludge and biochar. The RAC, determined as the percentage of carbonate and exchangeable-state heavy metal in the substance, can also be used to measure the biological accumulation of heavy metals.…”

Section: Evaluation Methods Of Heavy Metal Riskmentioning

confidence: 99%

“…Geoaccumulation index (GAI) 24,25 is another method that can be used to measure the pollution levels of heavy metals. The potential ecological risk 24,26 index (RI) can evaluate the ecological risk based on the intensity, sensitivity and toxicity of the heavy metals.…”

Section: -5mentioning

confidence: 99%

“…15,[18][19][20][21] Therefore, the Community Bureau of Reference proposed the sequential extraction procedure (BCR) to divide the heavy metals into different forms 14,15,22,23 that can also provide information about heavy metal potential reactivity, leaching potential and bioavailability in sludge or biochar. Different risk assessment models can be used to further analyze the risk of heavy metals: the risk assessment code (RAC) 22,24 was applied to quantify heavy metal bioavailability in sediments, ashes, soils, and so on. Geoaccumulation index (GAI) 24,25 is another method that can be used to measure the pollution levels of heavy metals.…”

Section: -5mentioning

confidence: 99%

“…Different risk assessment models can be used to further analyze the risk of heavy metals: the risk assessment code (RAC) 22,24 was applied to quantify heavy metal bioavailability in sediments, ashes, soils, and so on. Geoaccumulation index (GAI) 24,25 is another method that can be used to measure the pollution levels of heavy metals. The potential ecological risk 24,26 index (RI) can evaluate the ecological risk based on the intensity, sensitivity and toxicity of the heavy metals.…”

Section: -5mentioning

confidence: 99%

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Chemical forms and risk assessment of heavy metals in sludge-biochar produced by microwave-induced low temperature pyrolysis

et al. 2016

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Section: Evaluation Methods Of Heavy Metal Riskmentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

See 2 more Smart Citations

Chemical forms and risk assessment of heavy metals in sludge-biochar produced by microwave-induced low temperature pyrolysis

et al. 2016

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“…Many studies have been done on the speciation of heavy metals to assess their environmental hazard [1,34,[50][51][52][53][54]. There was a significant difference in metals speciation between sludges of different origins.…”

Section: Characteristics Of Heavy Metalsmentioning

confidence: 99%

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Zhang

Wang

2017

Sustainability

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Abstract:The safe disposal of sewage sludge during the process of municipal wastewater treatment has become one of the major concerns of increased production. Land application was thought of as a more economical method for sewage sludge disposal than landfill and incineration. However, the presence of heavy metals in sewage sludge restricted the use of land application. The environmental risk of heavy metals was dependent on their contents, chemical speciations, and soil characteristics. Composting and chemical immobilization were the commonly used methods to immobilize the heavy metals in sewage sludge. The immobilization mechanism and speciation transformation of heavy metals during the composting process were presented. Aluminosilicate, phosphorus-bearing materials, basic compounds, and sulfides were reviewed as the commonly used chemical immobilizing agents. The problems that occur during the immobilization process were also discussed. The combination of different methods and the modification of chemical immobilizing agents both improved the fixation effect on heavy metals.

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Heavy metal pollution level and potential ecological risk assessment of sludge landfill

Tang

Sima

et al. 2022

Env Prog and Sustain Energy

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The level of heavy metals of the sludge in the landfills has attracted the environmental researchers due to their non-biodegradability, persistence, toxicity and biomagnification. Heavy metals contamination and ecological risk assessment in the sludge landfills were assessed. In this work, the enrichment factor (EF) and geoaccumulation index were used to analyze heavy metal pollution degree in the sludge landfills. Meanwhile, the potential ecological risk index was used to assess heavy metals potential ecological risk in the sludge landfills. Results indicated that heavy metal concentrations order was Cr > Cd > Ni > Zn > As>Cu = Pb > Hg. Cr, Cd and Ni coefficient variation were 57%, 53% and 38%, respectively, which indicated that Cr, Cd and Ni content have a large range variation. EF and geo-accumulation index analyze heavy metal pollution degree in the sludge landfills. Results demonstrated that Hg, Cd, Cu and Zn obtained a high pollution degree. However, Cr, Ni, As and Pb have a low pollution in the sludge landfills. Potential ecological risk index indicated that Hg obtained the highest pollution degree, which demonstrated that the potential ecological risk level is the highest value (E r i ≥ 3500, RI ≥ 4163). Whereas, other heavy metals have a low pollution degree in the sludge landfills. Therefore, Hg, Cd and Cu content of sludge should be strictly restricted in agricultural use. Meanwhile, it should be strictly restricted Hg, Cd and Cu content of wastewater discharge, and reduced heavy metal content of sludge.

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Speciation and environmental risk assessment of heavy metal in bio-oil from liquefaction/pyrolysis of sewage sludge

Cited by 116 publications

References 35 publications

Chemical forms and risk assessment of heavy metals in sludge-biochar produced by microwave-induced low temperature pyrolysis

Chemical forms and risk assessment of heavy metals in sludge-biochar produced by microwave-induced low temperature pyrolysis

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Heavy metal pollution level and potential ecological risk assessment of sludge landfill

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