吸附-超滤组合工艺对低浓度氨氮废水的处理研究  

Treatment of Low Concentrated Ammonia Nitrogen Wastewater with Adsorption and Ultrafiltration

作　　者：王皓辉 郝林林 李桂菊 WANG Haohui;HAO Linlin;LI Guiju(College of Marine and Environmental Sciences,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《天津科技大学学报》2020年第6期37-43,共7页Journal of Tianjin University of Science & Technology

摘　　要：天津市污水综合排放标准(DB 12/356—2018)对出水氨氮提出更高要求,针对常规处理工艺无法使氨氮达标排放的问题,本文以天然斜发沸石原料,采用热盐改性方法制备了HNa-Ze吸附剂,并采用吸附-超滤组合工艺解决粉末态吸附剂难以有效分离的问题.通过对HNa-Ze进行吸附等温线和吸附动力学实验,探究HNa-Ze吸附性能,并从粒径、投加量、膜污染3方面考察装置的运行条件.结果表明:HNa-Ze吸附氨氮的过程符合准二级动力学模型和Langmuir吸附等温线模型;HNa-Ze对氨氮的吸附效果比天然沸石提高42.5%,选择30 min的水力停留时间,20 g/L的初始投加量,出水氨氮为1.47 mg/L,达到天津市污水综合排放标准一级标准.Tianjin Integrated Wastewater Discharge Standards(DB 12/356-2018)put forward higher requirements for the effluent ammonia nitrogen,but the conventional treatment can not make the ammonia nitrogen meet the standards.In this research,natural clinoptilolite was used as a raw material and hot salt modification as the method.HNa-Ze adsorbent was prepared and the adsorption/ultrafiltration combination process was employed to solve the problem that the powder adsorbent can not effectively carry out the work of separation.The adsorption isotherm and adsorption kinetics of HNa-Ze were used to investigate the adsorption performance of HNa-Ze,and the operating conditions of the device were studied from three aspects:particle size,dosage and membrane fouling.The results show that the process of HNa-Ze adsorption of ammonia nitrogen conforms to the quasi-secondary kinetic model and the Langmuir adsorption isotherm model.The ammonia nitrogen adsorption effect of HNa-Ze is 42.5%,higher than that of natural zeolite.The hydraulic retention time is 30 min,the initial dosage is 20 g/L,and the ammonia nitrogen effluent is 1.47 mg/L,which can meet the first standards of the city requirement.

关 键 词：氨氮 改性沸石 吸附 超滤 

分 类 号：X52[环境科学与工程—环境工程]