摘要
针对目前高氨氮、低碳氮比废水传统处理工艺中的缺陷,运用电去离子技术(EDI)提取其中的氨氮,既可降低传统处理工艺的难度与成本,又可实现氨氮资源化。以垃圾渗滤液为处理对象,考察了电压、淡水循环流量对EDI技术提取渗滤液中氨氮性能的影响。在电压为20 V、淡水循环流量为8 mL/min的条件下,EDI装置运行8 h后,氨氮去除率和最佳提取率分别为81.7%、67.3%,此时电流效率为23.4%、能耗为1.9 kW·h/g(以N计)。另外,利用扫描电镜观测膜污染前后以及经不同方式清洗后的表面特征,研究膜清洗后EDI装置性能的恢复情况,结果表明,采用3%的酸碱液交替清洗膜即可使EDI装置提取氨氮的性能恢复至初始水平。
In view of the problems existed in the current traditional process for the treatment of high ammonia nitrogen and low carbon to nitrogen ratio wastewater,the application of electrodeionization(EDI)to extract ammonia nitrogen can not only reduce the difficulty and cost of the traditional treatment process,but also realize the recycle of ammonia nitrogen.The effects of voltage and feed flow on the performance of EDI for extracting ammonia nitrogen from landfill leachate were investigated.When the voltage and feed flow were 20 V and 8 mL/min,the ammonia nitrogen removal rate and the optimal extraction rate were 81.7%and 67.3%,respectively,and the current efficiency and energy consumption were 23.4%and 1.9 kW·h/g(calculated in N)after operation of the EDI device for 8 hours.In addition,the surface characteristics of the membrane before and after fouling and after cleaning in different ways were observed by scanning electron microscopy,and the recovery of EDI performance after cleaning was investigated.The performance of EDI for extraction of ammonia nitrogen was restored to the initial level by alternately cleaning with 3%acid and alkali solution.
作者
廖德祥
琚佳琪
魏福强
胡超
LIAO De‑xiang;JU Jia‑qi;WEI Fu‑qiang;HU Chao(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2023年第5期106-113,共8页
China Water & Wastewater
基金
国家自然科学基金资助项目(51109126)
上海国际合作基金资助项目(17230732300)
上海自然科学基金资助项目(18ZR1417000)。
关键词
电去离子技术
垃圾渗滤液
氨氮
膜污染
electrodeionization
landfill leachate
ammonia nitrogen
membrane fouling
