投加电石渣和PAM处理洗煤废水的效果及作用机理

目的研究电石渣—PAM处理洗煤废水小试实验研究,防止洗煤废水污染并使之处理后能够回用.方法通过实验与理论分析对电石渣处理洗煤废水的作用机理进行研究.结果采用电石渣—PAM混凝沉淀法处理洗煤废水具有较好的处理效果,处理后洗煤废水的各项指标均能达到国家排放标准,且能满足洗煤工艺的用水要求.结论电石渣对洗煤废水的混凝作用不是补给了OH-,而是提供了大量的Ca2 ,Ca2 通过压缩双电层,破坏了煤泥颗粒的稳定性,从而使煤泥颗粒发生凝聚,OH-和Ca(OH)2对洗煤废水的混凝不直接起作用.

Study on the Effect and Action Mechanism of Coal - Washing Wastewater Treatment with Carbide Slag and PAM

To prevent the pollution of coal-washing wastewater and reuse it after proper treatment,both lab-scale and full-scale study were carried out to treat the wastewater with carbide slag and PAM coagulants and the coagulation mechanism was investigated simultaneously.Experimental results showed that carbide slag and PAM were quite efficient in treating the coal-washing wastewater,with all criteria of the effluent meeting the national Integrated Wastewater Discharge Standard and the effluent being capable of reuse as process water.The experimental result and theoretical analyses indicate that the coagulation mechanism of wastewater with carbide slag was to provide sufficient Ca2 ,instead of OH-.The provided Ca2 coagulated with coal slime through the compress of double-layer and made the coal slime destabilized.Neither OH-nor Ca(OH)2 plays a direct role in coagulation of coal washing wastewater.