改性混凝剂处理煤矿废水的实验及其应用

Experiment and Application of Coalmine Waste Water Modified Coagulant Handling

煤矿废水悬浮物的主要贡献是其中的细小煤粉。仅依靠自重沉淀的方式去除是较难达标的,采用混凝剂助沉的方式可提高悬浮物的去除率。以湖南某煤矿废水为研究对象,采用混凝沉淀法,从混凝剂种类、投加量研究悬浮物的去除效果,得出最佳用量。混凝实验表明:改性混凝剂对煤矿废水的最佳实验条件是加入量为3.5mg/L,静置时间20min,悬浮物去除率达到78%。将工艺参数进行工程应用,采用“预沉淀调节池+高密度沉淀池+无阀滤池”组合工艺对该矿废水进行处理,可使出水水质达到《煤炭工业污染物排放标准》(GB20426—2006)中现有生产线执行要求。

Suspended matter in coalmine waste water is mainly coal fines.Only depends on dead-weight precipitation mode is hard to meet standards,while using coagulant to aid precipitationcan improve suspended matter removal rate.Taking a Hunan coalmine waste water as a subject investigated,using coagulant aided precipitation,from coagulant kind,input amount studied suspended matter removal effect,worked out best amount.The experiment has shown that modified coagulant coalmine waste water best experiment condition is input amount 3.5mg/L,stationary time 20min,suspended removal rate can run up to 78%.Taking the process parameters applied to engineering field,using“preformed precipitation regulation pool+high density precipitation tank+valve free filter chamber”group technology carried out waste water handling of the coalmine.The handling can make output water quality achieve the“Emission Standard for Pollutants from Coal Industry”(GB20426—2006)requirements on existing production lines.