农业环境科学学报2025，Vol.44Issue(3)：769-783,15.DOI:10.11654/jaes.2025-0051
组合人工湿地在农村污水处理中的应用及对PPCPs的去除效果
The application of hybrid constructed wetlands in rural sewage treatment and the removal effect on PPCPs
摘要
Abstract
In order to explore the treatment of rural domestic sewage by constructed wetlands,this study takes the"vertical flow+two-stage horizontal subsurface flow"hybrid constructed wetlands rural domestic sewage treatment project that has been in operation for many years as the object,monitors the changes in influent and effluent water quality in typical years during operation,and the contribution of each wetland unit to pollutant removal.At the same time,the existence and removal of typical new pollutants pharmaceuticals and personal care products(PPCPs)in the project were investigated.The results indicated that due to the relatively small rural population,the quality of sewage was greatly affected by the operating conditions of restaurants in the village,especially organic matter.After the restaurant closed,the chemical oxygen demand(COD)concentration in the influent water decreased by nearly 60%.During operation,the constructed wetlands had good resistance to shock loads,with average effluent COD,ammonia nitrogen(NH+4-N),and total phosphorus(TP)concentrations of 41.27,13.67 mg·L-1,and 2.95 mg·L-1,respectively.Organic matter was mainly removed through microbial decomposition and plant absorption.In the vertical flow wetland,the water flow had more sufficient contact with the substrate,microorganisms,and plant roots.Moreover,it was in a semi-saturated state,with high microbial diversity and good oxygen transfer,which was conducive to microbial decomposition.Therefore,it had the highest contribution rate to the removal of COD,reaching 62.90%.The removal of TP was mainly the result of the adsorption effect of the substrate.The removal contribution rate of the first-level horizontal flow wetland was 59.13%,and it performed the best among the three groups of wetlands.TN and NH+4-N were gradually removed in wetlands at all levels through reactions such as ammonification,nitrification,and denitrification.In addition,a total of 19 types of PPCPs were detected in the influent water.The constructed wetland had a remarkable removal effect on PPCPs,and its degradation mechanism involved various pathways such as plant absorption and metabolism,microbial decomposition,substrate adsorption,and photolysis.The study found that the removal efficiency of PPCPs was negatively correlated with their distribution coefficient(Kd)in the substrate.PPCPs with lower Kd values were more easily removed through mechanisms such as plant absorption,microbial degradation,and photolysis in constructed wetlands due to their higher solubility and bioavailability.The study showed that hybrid constructed wetlands had strong resistance to shock loads and performed well in removing conventional pollutants and PPCPs.关键词
农村生活污水/组合型人工湿地/生态处理/常规污染物/药物及个人护理产品(PPCPs)Key words
rural domestic sewage/hybrid constructed wetlands/ecological treatment/conventional pollutants/pharmaceuticals and personal care products(PPCPs)分类
资源环境引用本文复制引用
胡雨嘉,胡泽宇,莫虎,蒙振思,张亚楠,白少元..组合人工湿地在农村污水处理中的应用及对PPCPs的去除效果[J].农业环境科学学报,2025,44(3):769-783,15.基金项目
广西重点研发计划项目(桂科AB22080067) （桂科AB22080067）
国家自然科学基金项目(52360024,52260024) Key Research and Development Program of Guangxi,China(AB22080067) （52360024,52260024）
National Natural Science Foundation of China(52360024,52260024) （52360024,52260024）
