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CASE ANALYSIS ON ENGINEERING APPLICATION OF USING INDIRECT THERMAL DESORPTION PROCESS TO REMEDIATE MERCURY-BEARING SOLID WASTE AND CONTAMINATED SOIL
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摘要: 云南某大型汞污染场地修复工程是国内首例采用间接热解吸工艺处理含汞固废及污染土壤的工程。通过工程实践获得了相关施工技术参数,当加热温度为600~750 ℃,停留时间为40~60 min时,修复后物料中总汞含量可达到修复目标要求,验证了间接热解吸工艺的修复效果。工程实施结果表明:间接热解吸工艺对高浓度含汞固废及污染土壤修复效果明显,修复后物料中污染物含量达到修复目标要求,污染物排放满足GB 16297—1996《大气污染综合排放标准》要求,未对环境产生不良影响。该工艺还可实现汞的资源化回收,具有广阔的应用前景和工程借鉴价值。Abstract: A large-scale mercury contaminated site remediation project in Yunnan was the first project in China that used indirect thermal desorption process to remediate mercury-bearing solid waste and mercury-contaminated soil. We obtained relevant construction technology parameters through the engineering practice. When the thermal desorption temperature was 600~750 ℃ and residence time was 40~60 min, the total mercury in remediated material could reach the corresponding targets, which verified the remediation effect of indirect thermal desorption process. The implementation results of this project showed that indirect thermal desorption process had significant remediation effect on high level mercury-bearing solid waste and mercury-contaminated soil, the remediated material reached the corresponding targets, pollutants emission met the Integrated Emission Standard of Air Pollutants (GB 16297—1996) and it had no adverse impact on the environment. The process could also realize the resourcilization and recovery of mercury, and had wide application prospects and engineering reference value.
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