Research on Pollutant Diffusion Control of Contaminated Dredged Material on the Mud Dumping Site
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摘要: 为了使相关污染物扩散防治技术实用化,本文系统地总结了环保疏浚堆场污染物的扩散方式,从余水处理、堆场防渗、疏浚底泥的无害化处置等几个方面介绍了国内外底泥堆场污染物扩散的防治技术.在太湖五里湖环保疏浚底泥堆场进行了生产性试验.堆场的防渗利用太湖周边广泛分布的黏土作为防渗材料,堆场周围 5个监测点的监测水质在疏浚前后基本没有变化,表明堆场黏土做防渗材料是可行的.向输泥管投加絮凝剂,在输泥管中快速混合,在堆场中反应、沉淀;向堆场出水投加絮凝剂,通过隔板混合池快速混合,折流反应池反应,在沉淀池中沉淀,2种方式都保证了排放余水ρ(SS)<200 mg/L.Abstract: This article thoroughly summarized pollutant diffusion pathways of contaminated dredged material on mud dumping site, and introduced control techniques in domestic China and out side China as well. Full-scale experiments of contaminant diffusion control had been done on the mud dumping site of Taihu Wuli lake environmental dredging project, by using the clay around Taihu lake as leachate prevention material. Water quality of five points around the mud dumping site were stable during the dredging process, which showed that the clay around Taihu lake could be used as leachate prevention material. Flocculants were added to the sludge pipe, in which flocculants were mixed rapidly, then they flocculated and sedimentated on the mud dumping site. Or, the flocculants were added into the discharge outlet of the mud dumping site, which mixed quickly in the clapboard tank and flocculated in the reciprocal baffled flocculating tank, then they sedimentated in the horizontal flow sedimentation tank. The results show that the solid suspension concentration of effluent is less than ρ(SS)<200 mg/L.
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