CARBON SEQUESTRATION CHARACTERISTICS OF DIRECT WET MINERALIZATION OF MUNICIPAL SOLID WASTE INCINERATION FLY ASH
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为实现生活垃圾焚烧飞灰(MSWIFA)资源化利用,采用单因素法和响应面曲线法研究MSWIFA直接湿法矿化固碳性能,获得最大CO2封存率,并采用BCR形态分析及毒性浸出试验评价其矿化前后重金属环境风险.结果表明:随着反应温度、压力、时间及液固比的增大,MSWIFA的CO2封存率先增大后减小,在105 ℃、2.0 MPa、1.5 h 和液固比为 20 mL/g 时最大 CO2 封存率分别为 16.71％,15.80％,15.36％,14.96％;基于响应面曲线法得出的优化反应条件为0.5 MPa、99.19 ℃、1 h及液固比25 mL/g,最大CO2封存率为12.91％;矿化反应后,MSWIFA中As和Pb的可氧化态转化为残渣态,Ba转化为可还原态,Cd转化为残渣态和可还原态,Zn的残渣态和可氧化态转化为可还原态和酸可溶态,反应后均无重金属毒性浸出的环境风险.
In order to realize the resource utilization of municipal solid waste incineration fly ash(MSWIFA),the direct wet mineralization carbon sequestration performance of MSWIFA was studied by single factor method and response surface methodology,and the maximum CO2 sequestration ratio was obtained.In addition,BCR speciation analysis and toxic leaching test were used to evaluate the environmental risk of heavy metals before and after the mineralization of MSWIFA.The results showed that,with the increase of reaction temperature,initial pressure,reaction time and liquid-solid ratio,the CO2 sequestration ratio first increased and then decreased,and at the optimized condition of each single factor,the maximum CO2 sequestration ratios were 16.71％,15.80％,15.36％and 14.96％at 105 ℃,2.0 MPa,1.5 h and 20 mL/g,respectively.Based on the response surface method,the optimal reaction conditions were obtained as follows:a pressure of 0.5 MPa,a temperature of 99.19 ℃,a reaction time of 1 h,a liquid-solid ratio of 25 mL/g,and the maximum CO2 sequestration ratio was 12.91％;after the mineralization reaction,the oxidizable form of As and Pb in the MSWIFA was transformed into residual form,the oxidizable form of Ba was transformed into reducible form,the residual and oxidizable form of Zn was transformed into reducible and acid soluble forms,and the oxidizable form of Cd was transformed into residual and reducible forms.
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