STABILIZATION EFFECT AND ENVIRONMENTAL RISK ASSESSMENT OF HEAVY METALS IN MSWI FLY ASH BY DIFFERENT ORGANIC CHELATING AGENTS

GUAN Yanyan; WANG Xiaona; ZHAO Chutong; ZHANG Ze; GAO Ming; WU Chuanfu; WANG Qunhui

doi:10.13205/j.hjgc.202312038

Volume 41 Issue 12

Dec. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(12): 304-311

GUAN Yanyan, WANG Xiaona, ZHAO Chutong, ZHANG Ze, GAO Ming, WU Chuanfu, WANG Qunhui. STABILIZATION EFFECT AND ENVIRONMENTAL RISK ASSESSMENT OF HEAVY METALS IN MSWI FLY ASH BY DIFFERENT ORGANIC CHELATING AGENTS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 304-311. doi: 10.13205/j.hjgc.202312038

Citation:

GUAN Yanyan, WANG Xiaona, ZHAO Chutong, ZHANG Ze, GAO Ming, WU Chuanfu, WANG Qunhui. STABILIZATION EFFECT AND ENVIRONMENTAL RISK ASSESSMENT OF HEAVY METALS IN MSWI FLY ASH BY DIFFERENT ORGANIC CHELATING AGENTS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 304-311. doi: 10.13205/j.hjgc.202312038

Citation:

GUAN Yanyan, WANG Xiaona, ZHAO Chutong, ZHANG Ze, GAO Ming, WU Chuanfu, WANG Qunhui. STABILIZATION EFFECT AND ENVIRONMENTAL RISK ASSESSMENT OF HEAVY METALS IN MSWI FLY ASH BY DIFFERENT ORGANIC CHELATING AGENTS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 304-311. doi: 10.13205/j.hjgc.202312038

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STABILIZATION EFFECT AND ENVIRONMENTAL RISK ASSESSMENT OF HEAVY METALS IN MSWI FLY ASH BY DIFFERENT ORGANIC CHELATING AGENTS

doi: 10.13205/j.hjgc.202312038

School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2023-01-19
Available Online: 2024-03-08

Abstract

Abstract

The stabilization effects of heavy metals in municipal solid waste incineration fly ash stabilized by piperazine chelating agent (TS300) and dimethyl dithiocarbamate (SDD) at different dosages were compared. The results showed that the leaching concentrations of heavy metals in chelated fly ash met the standard limit of GB 16889—2008, when the dosage of TS300 and SDD was 3% and 5%, respectively. However, the leaching concentrations of Cd in the 3% TS300 group, and Pb and Cd in the 5% SDD group, all exceeded the standard limit after the chelated fly ash was placed for 28 days. In addition, chelation stabilization treatment can transform heavy metals in fly ash from unstable reducible fractions to more stable oxidizable fractions, and it can also broaden the range of pH value for stable existence of fly ash (the leaching concentrations of heavy metals met the standard within this pH range). The analysis results of the environmental risk assessment code showed that the target heavy metals in the 3% TS300 group posed no risk to the environment within the inspection time range (0 to 28 days), while the Pb, Zn and Cd in the 5% SDD group posed potential environmental risks after being placed for 28 days. Therefore, TS300 is superior to SDD, in terms of heavy metal stabilization effect of fly ash in this study.
- MSWI fly ash,
- organic chelating agent,
- heavy metals leaching,
- chemical speciation,
- environmental risk

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References(31)

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