有机改性膨润土法处理印钞废水

采用有机改性膨润土法对某印钞厂的高浓度有机难降解废水进行处理以降低水中的有机污染物和水体颜色.实验结果显示,聚合氯化铝(PAC)投加量对于处理效果的影响最大,当膨润土投加量为15 g.L-1,聚合氯化铝投加量为3.5 g.L-1,搅拌时间为0.5h时,处理效果最佳,印钞废水吸光度去除率高达96.55%,化学需氧量(COD)去除率最高达到73.31%.使用该方法对印钞废水处理,可以有效降低水体COD和表观颜色,并且不引入新的污染物,无浓水排放,非常适合作为废水深度处理的预处理工艺.

Treatment of wastewater from banknote printing works by organo-modified bentonite

Experiments on treating high-concentrated refractory organic wastewater from banknote printing works by organo-modified bentonite were performed to degrade the organic pollutants and color.The most important factor in the experiments is the dosage of poly aluminum chloride(PAC).When the dosages of organo-modified bentonite and PAC are 15 and 3.5g·L-1,respectively,and the mixing time is 0.5h,the treatment effect achieves the best level.The absorbance removal rate of the wastewater can reach up to 98.11%,while the removal rate of chemical oxygen demand(COD) increases to 73.31%.This treatment can dissolve COD and color in the wastewater without producing the concentrated wastewater and inviting any toxic and harmful substances,so it is a favorable pre-treatment for an advanced wastewater treatment.