改性粉煤灰处理氨氮废水实验研究

Removing ammonia-nitrogen from waste water by modified fly ash

研究经氢氧化钠改性后的粉煤灰对废水中氨氮的去除效果.实验结果表明,当氢氧化钠浓度为3 mol.L-1时,粉煤灰对氨氮的去除率最高;当改性粉煤灰的投加量为2 g、搅拌时间为20 min、pH为7、氨氮废水起始浓度为50 mg·L-1时,氨氮去除率达到70.86%;粉煤灰改性前后的SEM和XRD表征表明,以氢氧化钠做改性剂促使粉煤灰生成了沸石.

The ammonia-nitrogen removal effect in waste water using coal ash modified by NaOH is studied.The experiment results showed that the coal ash modified by 3 mol·L-1 NaOH had a highest removal rate of ammonia-nitrogen.Under the condition that the initial ammonia-nitrogen concentration of waste water was 50 mg·L-1,coal ash dose was 2 g,stirring time was 20 min,and pH value was 7,the removal rate of ammonia-nitrogen was up to 70.86%.The SEM and XRD of the coal ash before and after modified proved that the NaOH made the coal ash converse into zeolite.