改性活性氧化铝强化屋顶收集雨水中氮磷的协同吸附效能  

Cooperative Adsorption Efficiency of Enhanced Nitrogen and Phosphorus Removal for Roof Rainwater Harvesting by Modified Activated Alumina

作　　者：姜伊凡 杨艳玲[1] 李星[1] 刘永旺 赵锂 JIANG Yifan;YANG Yanling;LI Xing;LIU Yongwang;ZHAO Li(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing100124,China;China Architecture Design&Research Group Co.,Ltd.,Beijing100044,China)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]中国建筑设计研究院有限公司,北京100044

出　　处：《净水技术》2022年第7期64-69,98,共7页Water Purification Technology

基　　金：国家重点研发计划(2018YFC0406203)。

摘　　要：用于景观水回用的屋面收集雨水水质需严格控制氮、磷含量,以避免富营养化和藻类滋生现象。文中针对活性氧化铝的氮、磷吸附作用,采用浸渍法制备了改性活性氧化铝,表征了改性活性氧化铝的氨氮吸附规律、理化特性和主要影响因素,对比了改性前后活性氧化铝单独吸附和协同吸附的氨氮和总磷的吸附效能。结果表明:改性活性氧化铝的酸性含氧官能团数量增多、离子交换能力提高,氨氮吸附容量增大了17.39%;活性氧化铝和改性活性氧化铝的氨氮吸附特性更符合拟二级动力学和Freundlich规律,高温更有利于改性活性氧化铝的氨氮吸附,弱酸性至中性是氨氮吸附效果最佳pH,当有机物与氨氮同时存在时,会发生明显的竞争吸附现象。改性活性氧化铝单独吸附与协同吸附氨氮和总磷的去除效能均得到明显改善,氮、磷协同吸附时氨氮和总磷去除率分别达55.46%和97.22%,比活性氧化铝提高了14.05个百分点和5.01个百分点。研究成果为屋面收集雨水的高效净化技术及其在景观水体的安全回用提供了参考。The nitrogen and phosphorus concentration of roof rainwater harvesting reused for landscape need to be strictly controlled to avoid eutrophication and algae breeding.Focusing on the adsorption effect of nitrogen and phosphorus on activated alumina,this paper introduced that modified activated alumina by impregnation method,and the ammonia nitrogen adsorption behavior,physicochemical properties and main influence factors were characterised.The adsorption efficiency was researched for cooperative adsorption of ammonia nitrogen and total phosphorus(TP)compared with the single adsorption by activated alumina and modified activated alumina respectively.The results showed that for modified activated alumina the amount of acidic oxygen containing functional groups increased through modification,the ion exchange capacity improved,and the ammonia nitrogen adsorption capacity increased by 17.39%.The adsorption kinetics of both activated alumina and modified activated alumina fitted well with the pseudo-second-order kinetics model,and the adsorption isotherms followed the amendatory Freundlich equation.High temperature favored the adsorption of ammonia nitrogen by modified activated alumina.The best pH range for ammonia nitrogen adsorption performance was slightly acidity and neutral condition.There was obvious competitive adsorption between organic matter and ammonia nitrogen.The removal efficiency of ammonia nitrogen and TP for single adsorption and cooperative adsorption of modified activated alumina were improved significantly,The removal rates of ammonia nitrogen and TP in the cooperative adsorption reached 55.46%and 97.22%,respectively,which were 14.05%and 5.01%higher than that of activated alumina.The results provide a reference for the efficient reuse of roof harvested rainwater and the environment safety of landscape water.

关 键 词：屋顶雨水收集 富营养化 活性氧化铝改性 协同吸附 氮磷去除 

分 类 号：TU991[建筑科学—市政工程]