改性粉煤灰吸附废水中氨氮的试验研究

Experimental study on adsorption of ammonia nitrogen from wastewater by modified fly ash

为进一步提高废水中氨氮的吸附效率,分别采用酸改性和酸-碱改性的粉煤灰作为吸附剂处理电厂脱硫废水中的氨氮,考察了改性粉煤灰投加量、振荡吸附作用时间、初始pH值对改性粉煤灰吸附性能的影响。结果表明:酸-碱改性粉煤灰对氨氮的吸附性能优于酸改性粉煤灰;影响氨氮吸附效果的因素显著性关系为振荡吸附作用时间>初始pH>酸-碱改性粉煤灰投加量,最优组合方案为投加量2.5 g、吸附作用时间2.5 h、溶液初始pH=8。

In order to further improve the adsorption efficiency of ammonia nitrogen in wastewater,acidmodified and acid-alkali-modified fly ash were used to adsorb ammonia nitrogen in power plant desulfurization wastewater.The effects of modified fly ash dosage,agitating adsorption time and initial pH value on adsorption performance were investigated.The results showed that the adsorption performance of acid-alkali-modified fly ash was better than that of acid-modified fly ash.The influence factors in order of significant relationship were oscillating adsorption time>initial pH>the dosage of acid-alkali-modified fly ash.The optimal condition was modified fly ash dosage of 2.5 g,adsorption time of 2.5 h,and initial pH of 8.