摘要
为探究人工湿地处理效果受水力停留时间(HRT)的影响,利用厌氧池-表流人工湿地(AT-SFCW)系统处理污水厂尾水,探讨COD_(cr)、NH_(4)^(+)-N、NO_(3)^(-)-N和TP污染物在系统内的去除规律。结果表明,AT-SFCW系统COD_(cr)、NH_(4)^(+)N、NO_(3)^(-)-N和TP去除效果随HRT的延长都呈现先增后减的趋势,系统最佳HRT为5 d,对各污染物去除率最高分别为83.68%,86.22%,88.99%,69.87%。HRT=5 d时各污染物浓度变化显示,污染物沿各处理单元明显降低,在厌氧池中COD_(cr)、NO_(3)^(-)-N大部分得到去除,分别降至18.19 mg/L和0.29 mg/L;NH_(4)^(+)N、TP的去除过程主要发生在表流湿地中,分别降至1.50,0.55 mg/L。为人工湿地最佳HRT的选择、脱氮规律的明确及氮磷去除率的提高具有重要的指导意义。
In order to explore the effect of hydraulic retention time(HRT)on the treatment effect of constructed wetland,the anaerobic tank surface flow constructed wetland(AT-SFCW)system was used to treat the tail water of sewage plant.The removal rules of COD_(cr),NH_(4)^(+)N,NO_(3)^(-)-N and TP pollutants in the system were discussed by investigating the effect of HRT change on the removal effect of pollutants.The results show that the removal efficiency of COD_(cr),NH_(4)^(+)N,NO_(3)^(-)-N and TP in AT-SFCW system increases first and then decreases with the extension of HRT.The optimal HRT of the system is 5 d,and the highest removal efficiency of each pollutant is 83.68%,86.22%,88.99%and 69.87%respectively.When HRT=5 d,the concentration change of each pollutant shows that the pollutants are significantly reduced along each treatment unit,and most of COD cr and NO_(3)^(-)-N are removed in the anaerobic tank,which are reduced to 18.19 mg/L and 0.29 mg/L respectively;The removal of NH_(4)^(+)N and TP mainly occurred in the surface flow wetland,decreasing to 1.50 mg/L and 0.55 mg/L respectively.This study provides a theoretical basis for the selection of the best HRT for the combined constructed wetland.The quantitative analysis of nitrogen and phosphorus removal pathways has important guiding significance for the in-depth understanding of the law of nitrogen removal in the constructed wetland and the improvement of the removal rate of nitrogen and phosphorus.
作者
何艳芸
冯民权
王毅博
HE Yan-yun;FENG Min-quan;WANG Yi-bo(State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China;College of Environment and Chemical Engineering,Xi’an Polytechnic University,Xi’an 710048,China)
出处
《应用化工》
CAS
CSCD
北大核心
2023年第4期1033-1037,1042,共6页
Applied Chemical Industry
基金
国家自然科学基金资助项目(51679191)
陕西省自然科学基础研究计划重点项目(2019JZ-42)
山西省水利科学技术研究与推广项目(2022GM037)。
关键词
表流湿地
水力停留时间
污水厂尾水
surface flow wetland
hydraulic retention time
tail water of sewage plant
作者简介
何艳芸(1997-),女,陕西榆林人,西安理工大学硕士研究生,师从冯民权教授,主要从事水环境模拟与污染控制的研究。电话:15667099332,E-mail:2447673398@qq.com;通信作者:冯民权(1964-),男,山西永济人,教授,博士,博士生导师,主要从事为水环境模拟与污染控制的研究。电话:13772078803,E-mail:mqfeng@xaut.edu.cn。
