摘要
硫酸废水处理系统的中和污泥属于有害废渣,其中As浸出率超标。采用固化的方法处理某冶炼厂硫酸废水中和污泥,发现以水泥∶粉煤灰∶污泥=1∶1∶2的配比固化后,固化块浸出液浓度达到国标规定(1.5 mg/L)。研究表明,粉煤灰替代水泥50%可达到较好的固化效果,浸泡24 d后浸出浓度达到稳定值,pH值为7时浸出浓度最小,外加剂对固化有负影响,采用湿养护可获得更好的效果。
The solidification of the sludge in the sulphuric acid wastewater treatment system with fly ash and cement was studied. The leaching rate of arsenic in the sludge exceeds the standard. The best solidifying proportioning is ： cement： flyash： sludge = 1 ： 1 ： 2. The leaching conccentration can get a stable value after 24 days leaching. The lowest leaching concentration can be get under pH 7. And the additives have negative effects. Using moisture maintenance is better than common maintenance. Comparing with cement solidifition, the fly ash is much more efficient and ecnomical.
出处
《环境工程学报》
CAS
CSCD
北大核心
2007年第10期112-115,共4页
Chinese Journal of Environmental Engineering
基金
云南省教育厅科学研究基金资助项目(02QY103)
关键词
固化
粉煤灰
砷
污泥
solidification
fly ash
arsenic
sludge
