[Effects of fly ash on the exchangeable heavy metals (Cu, Zn, Pb) during sewage sludge composting and land utilization].
A series of composting test using fly ash as stabilizing agent were investigated to study the variation of the exchangeable heavy metals during composting and land utilization. A whole procedure of adsorption and desorption of stabilized heavy metals were analyzed. The result shows that the exchangeable Cu increases while the exchangeable Zn and Pb decrease during composting. Fly ash has significant stabilizing effect on Zn and Pb as evidenced by a decline of 62.47% and 92.61% respectively in the trails with flay ash as stabilizing agent. However there is no obvious change with exchangeable Cu. Although there is a big difference on the activities of heavy metals in different soil types tested, it seems to be ineluctable that addition of sewage sludge composting products cause enrichment of heavy metal in soil.
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. shengjun99@mails.tsinghua.edu.cn
Jun
J
Sheng
Wen-Jing
WJ
Lu
Hong-Tao
HT
Wang
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D003300:Copper / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry*; D052638:Particulate Matter / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry
D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D012722:Sewage; D012989:Soil Pollutants; D007854:Lead; D002244:Carbon; D003300:Copper; D015032:Zinc