活性炭和沸石对氨氮的吸附特性及生物再生

Adsorption characteristics of activated carbon and zeolite and their biological regeneration

采用活性炭和沸石作为吸附材料,分别考察了这两种吸附材料对水体中氨氮的吸附特性及其生物再生性能。实验结果表明,活性炭和沸石对水体中氨氮的等温吸附符合Freundlich等温式,其拟合度分别为0.9783和0.9303;静态吸附结果表明活性炭和沸石均具有较好的氨氮吸附性能,24 h内沸石对氨氮的吸附能力为1.27 mg/g,高于活性炭的0.53 mg/g;动态吸附中沸石达到吸附饱和的时间为96 h,较活性炭达到吸附饱和的时间长,沸石显示出作为氨氮吸附剂的优越性;活性炭和沸石经过96 h的生物再生后吸附性能获得一定程度的再生,出水中氨氮浓度比未进行生物再生前分别降低17.31 mg/L和8.32 mg/L,且都在表面形成了稳定的生物膜。

Activated carbon and zeolite were selected as the adsorption materials and their adsorption properties of ammonia nitrogen and biological regeneration were studied.The experimental results showed that the characteristics of absorbed ammonia nitrogen of the activated carbon and zeolite met the Freundlich isotherm,and the fitting were 0.9783 and 0.9303,respectively.The static adsorption experimental results showed that the activated carbon and zeolite all had good capabilities of adsorbing ammonia nitrogen,and the adsorption capacity of ammonia nitrogen of the zeolite was 1.27 mg/g,which was higher than that of the activated carbon that was 0.53 mg/g during the 24 h-experiment.The time of the zeolite adsorption saturation was 96 h during the dynamic experiment,which was longer than that of activated carbon,and the zeolite showed the superiority of ammonia nitrogen adsorbent.The adsorption performance of these absorbing materials was recovered after the 96 hours of biological regeneration.The average concentrations of ammonia nitrogen in effluent water decreased 17.31 mg/L and 8.32 mg/L in active carbon and zeolite respectively,and the biomembrane on the surface of active carbon and zeolite were formed.