改性粉煤灰在废水处理中的应用

Application of Modified Flying Ash in Waste Water Treatment

用火法对粉煤灰进行改性处理,改性后粉煤灰的物理化学性质变化较大,新生矿物相有A型沸石和Na-P型沸石.通过正交实验,建立了最佳改性及处理含Cu2+废水的工艺条件:原状粉煤灰与Na2CO3质量比为1∶2,NaOH浓度为1 mol/L,固液比为1∶5;2 g改性粉煤灰对250 mL浓度为20 mg/L的Cu2+模拟废水的吸附率达97%.处理含Cr6+废水的最佳条件为:改性粉煤灰5 g置于250 mL浓度为3 mg/L,pH=7的废水中,搅拌时间30 min,对Cr6+吸附率达89.6%,处理后的废水Cr6+浓度为0.31 mg/L,低于国家废水排放标准(0.5 mg/L).

In the research of the phisico chemical properties and minerals composition, the physical property of modified flying ash changes. New mineral faces--A type and Na -P type zeolites exist there. The best modifying method for flying ash and the combination of treating Cu^2＋ -bearing waste water is carried out by orthogonal experiment to reveal that the ratio of flying ash to Na2 CO3 equals to 1 ： 2 （ mass fraction）, NaOH concentration is 1 mol/L, 2 g modified flying ash adsorption ratio can reach 97% for 250 mL Cu^2＋ concentration 20 mg/L. The best combination for Cr^6＋ concentration 3mg/L and pH =7 is 5 g modified flying ash with 30 min stirring for the waste water , with the adsorption ratio of Cr^6＋ 89.6%. The Cr^6＋ concentration after treating is 0.31 mg/ L, lower than the national standard for discharging （0. 5 mg/L）.