吹脱-粉煤灰吸附联合处理高氨氮废水

Combined treatment of high ammonia nitrogen wastewater by blowdown and fly ash adsorption

为了更好地处理稀土高氨氮废水,可综合应用吹脱-粉煤灰吸附技术。通过调节吹脱时的pH、时间、鼓气量,对氨氮进行预处理。再以不同的改性方法对粉煤灰进行改性,对氨氮进行深度处理,结果表明:在pH为11,吹脱时间为48 h,鼓气量为2.5 L·min^(-1)时,氨氮预处理效果为最佳;吸附效果排序为:粉煤灰碱改性粉煤灰>碳酸钠改性粉煤灰>酸改性粉煤灰>沸石粉联合粉煤灰处理>粉煤灰(粒径小于0.147 mm)>粉煤灰沸石粉灼烧>粉煤灰,采用2 mol·L^(-1)氢氧化钠改性后的粉煤灰,在吸附5 h时吸附达到最佳,此时吸附量为1.31 mg·g^(-1)。

In order to better treat the rare earth high ammonia nitrogen wastewater,the blowing off-fly ash adsorption technology can be comprehensively applied.By adjusting the pH,time and pumping amount during blowing out,treat the ammonia nitrogen in a pretreatment,and then change the fly ash by different modification methods to deeply treat the ammonia nitrogen.The results showed that when pH was 11,the blowout time was 48 h,the drum volume was 2.5 L·min^(-1),the ammonia nitrogen pretreatment effect was the best.Adsorption effect:alkali modified fly ash>sodium carbonate>fly ash>acid modified fly ash>zeolite powder combined with fly ash treatment>fly ash(particle size was less than 0.147 mm)>fly ash zeolite burning>fly ash,using 2 mol·L^(-1 )sodium hydroxide modified fly ash,the best adsorption,the adsorption amount was 1.31 mg·g^(-1).