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Published on: February 21, 2017
A comparative study on stabilization of available As in highly contaminated hazardous solid waste
Li-Fang Hu1, Hua-Jun Feng, Yu-Yong Wu
1Department of Environmental Engineering, Zhejiang University, 268 Kaixuan Rd, Hangzhou 310029, China.
Journal of Hazardous Materials
|October 9, 2009
Summary
Chemical fixation effectively stabilized arsenic in industrial solid waste. The optimal treatment combined ferric sulfate, magnesium chloride, and calcium hydroxide, significantly reducing arsenic leaching and migration.
Area of Science:
- Environmental Chemistry
- Waste Management
- Inorganic Chemistry
Background:
- Organic arsenic industry generates solid waste residual (SWR) containing available arsenic (As).
- Arsenic contamination poses significant environmental and health risks.
- Chemical stabilization is a key strategy for managing hazardous waste.
Purpose of the Study:
- To stabilize available arsenic in SWR from the organic arsenic industry.
- To evaluate the effectiveness of single and combined chemical fixation treatments.
- To assess the impact of aging on arsenic fixation.
Main Methods:
- Chemical fixation using ferric sulfate (FS), magnesium chloride (MC), and calcium hydroxide (CH).
- Leaching tests: Toxicity Characteristic Leaching Procedure (TCLP) and Synthetic Precipitation Leaching Procedure (SPLP).
- Sequential Extraction Procedure (SEP) to analyze arsenic speciation and migration.
Main Results:
- Optimal molar ratios determined: Fe:As (2:1), Mg:As (3:1), Ca:As (2:1).
- Combined fixation (FS+MC+CH) proved to be the most effective treatment.
- TCLP, SPLP, and SEP demonstrated the efficacy of the fixation process in reducing arsenic mobility.
- Aging treatment was not essential for evaluation after 3 days, though it further improved fixation.
Conclusions:
- Chemical fixation is a viable method for stabilizing arsenic in industrial SWR.
- The combined FS+MC+CH treatment offers optimal stabilization.
- TCLP, SPLP, and SEP provide a comprehensive system for evaluating fixation effectiveness.
- Rapid evaluation of fixation is possible without aging, simplifying waste management protocols.
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