Na型粉末树脂回收废水中低浓度氨氮  

Recovery of low concentration ammonia nitrogen in wastewater by Na-type powder resin

作　　者：彭飞 张焕祯[1] 何文妍 房阔 王凯军 PENG Fei;ZHANG Huanzhen;HE Wenyan;FANG Kuo;WANG Kaijun(School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100084,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100084 [2]清华大学,环境学院环境模拟与污染控制国家重点联合实验室,北京100084

出　　处：《环境工程学报》2020年第1期34-42,共9页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2015ZX07509-001);中国博士后基金资助项目(2018M631489)

摘　　要：为探究Na型粉末树脂回收废水中低浓度氨氮的可行性,分别采用静态摇瓶与动态树脂柱方法进行实验研究。结果表明:预处理仅使粉末树脂吸附氨氮的能力降低了5%;在中性与酸性条件下,Na型粉末树脂对低浓度氨氮去除率均可达到99%;每增加2 g·L^-1树脂投加量,氨氮去除率会提高20%,但吸附容量下降2.85 mg·g^-1;钙镁离子的存在会降低Na型粉末树脂对氨氮的吸附容量,最大降低量为3.5 mg·g^-1;由于钾离子与氨氮为同价离子,其影响不显著。Na型粉末树脂对氨氮的吸附符合Langmuir吸附等温线,吸附过程符合准二级动力学。根据实验结果,Na型粉末树脂静态运行方式适用于低浓度氨氮的回收,但动态运行方式下粉末树脂达到吸附饱和时间更短,因此,需要对运行方式进一步研究。The purpose of this study was to investigate the feasibility of low-concentration ammonia nitrogen in the recovery of wastewater from Na-type powder resin.Experiments were carried out using static shake flasks and dynamic resin column methods.The results showed that the ability of ammonia nitrogen adsorption by the powder resin only decreased by 5%through the pretreatment.Under neutral and acidic conditions,the removal rates of low concentration ammonia nitrogen by Na-type powder resin could reach 99%.The ammonia nitrogen removal rate increased by 20% with every increase of 2 g·L^-1 resin dosage,while the adsorption capacity decreased by 2.85 mg·g^-1.The presence of calcium and magnesium ions could reduce the ammonia nitrogen adsorption capacity of Na-type powder resin with the maximum decrease of 3.5 mg·g^-1.Due to the same valence of potassium ions and ammonia nitrogen,the effect of potassium ions was insignificant.The adsorption of ammonia nitrogen by Na-type powder resin accorded with Langmuir adsorption isotherm.The adsorption process of Na-type powder resin accorded with quasi-secondary kinetics.According to the experimental results,the static operation mode of the Na-type powder resin was suitable for the recovery of low-concentration ammonia nitrogen,but the dynamic operation mode led to a shorter saturation time of the powder resin,which indicated less effectiveness.Therefore,further research will be need on other more economically feasible modes of operation.

关 键 词：粉末树脂 氨氮 吸附等温线 二级动力学 

分 类 号：X703.1[环境科学与工程—环境工程]