Leaching Behavior of Heavy Metals from Phosphatized Sludge and Bottom Ash
Sludge contains a considerable amount of heavy metals, such as Cu, Pb, Cr, etc. The heavy metals can be released from the sludge and its bottom ash after incineration to the environment through lixiviation by stormwater runoff and groundwater, which are harmful to the environment and human health. Hence, the influence of phosphoric acid pretreatment on heavy metal leaching behavior from phosphatized sludge and its bottom ash is investigated in the paper. The result indicated that the concentrations of Cu, Pb and Cr in the leaching liquor reduced by 42.5％, 46.9％ and 95.0%, respectively, after phosphatation. Moreover, the leaching of heavy metal from bottom ash after incineration of phophatized sludge also can be inhibited insignificantly. The concentration of Cr and Pb in leaching liquor reduced by 97.1% and 43.9% when the phosphoric acid content increases form 3% to 20%, which indicated the important thermal stability of the water-insoluble metallic phosphates formed during incineration of phosphatized sludge.
Ping TANG Zheng-miao XIE Yu-yong WANG
The College of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, China
国际会议
The Fifth International Conference on Waste Management and Technology(第五届固体废物管理与技术国际会议)
北京
英文
402-405
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）