摘要
以垃圾焚烧飞灰水洗液中的Cu和Cr为研究对象,采用通入CO_2沉淀处理的方法,通过改变CO_2的浓度、流速、通入时间、反应温度以及重金属离子初始浓度,对水洗液中的Cu和Cr的沉淀效果进行实验研究.结果表明,CO_2能够很好地沉淀水洗液中的Ca~(~(2+)),以及降低p H值; CO_2的浓度越高,Cu和Cr的沉淀效果越好; CO_2沉淀处理Cu和Cr的最佳工艺条件为:CO_2浓度10%、通入时间80 s、流速2 m L·min-1和反应温度40℃,在此工艺条件下,水洗液中Cu和Cr的沉淀率分别达到95%和50%左右.
Taking Cu and Cr in the water washing solution of municipal solid waste incinerator( MSWI) fly ash as the research object,adopting the sedimentation method by blowing CO_2,the effects of CO_2 concentration,flow rate,blowing time,reaction temperature and heavy metal initial concentrations on the sedimentation of Cu and Cr in the water washing solution were studied. The results showed that CO_2 could effectively precipitate Ca~(2+)and decrease the pH value of the water washing solution. Higher CO_2 concentrations were beneficial to the sedimentation of Cu and Cr; The optimal process conditions of CO_2 precipitation treatment were a CO_2 concentration of 10%,a blowing time of 80 s,a flow rate of 2 m L·min-1 and a reaction temperature of 40 ℃. Under these conditions,the sedimentation rates of Cu and Cr reached about 95% and 50%,respectively.
引文
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