LIYuan,ZHANGRu-tao,LIUQi-xuan,et al.Efficiency of Constructed Wetlands in Removing Conventional Pollutants and Estrogens from Rural Sewage[J].China Water & Wastewater,2025,41(21):144-148.
人工湿地去除农村污水中常规污染物和雌激素效能
- Title:
- Efficiency of Constructed Wetlands in Removing Conventional Pollutants and Estrogens from Rural Sewage
- Keywords:
- constructed wetland; filler; hydraulic retention time; rural sewage; estrogenic pollutants
- 摘要:
- 分别选择沸石、铁碳、硫铁矿作为人工湿地的填料，考察其对农村污水中常规污染物以及雌酮（E1）、雌二醇（E2）、17α-乙炔雌二醇（EE2）等典型雌激素污染物的去除效果，同时分析了常规沸石填料人工湿地在不同水力停留时间（HRT）下对污染物的去除效果。结果表明，在相同HRT下，铁碳填料人工湿地对常规污染物及雌激素的去除率最高，硫铁矿填料人工湿地次之；相比沸石填料人工湿地，铁碳填料人工湿地对COD、NH3-N、TN、TP的去除率分别提高29.30%、47.39%、30.80%和62.38%，对E1、E2、EE2的去除率分别提高59.49%、63.65%和45.35%。在沸石填料人工湿地中，随着HRT的延长，常规污染物和雌激素的去除效果逐渐提升，与HRT=12 h相比，当HRT=36 h时，COD、NH3-N、TN、TP去除率分别提高20.12%、20.22%、10.98%和34.35%，E1、E2、EE2去除率分别提高43.68%、37.75%和39.78%。
- Abstract:
- Zeolite, iron-carbon composites, and pyrite were selected as fillers for constructed wetlands to evaluate their performance in removing conventional pollutants from rural sewage as well as typical estrogenic pollutants, including estrone (E1), estradiol (E2), and 17α-ethinylestradiol (EE2). Additionally, the pollutants removal efficiency of conventional zeolite-filled constructed wetlands was examined under varying hydraulic retention times (HRTs). Under the same HRT, the iron-carbon-filled constructed wetland exhibited the highest removal efficiency for both conventional pollutants and estrogens, followed by the pyrite-filled constructed wetland. Compared with the zeolite-filled constructed wetland, the iron-carbon-filled system achieved 29.30%, 47.39%, 30.80%, and 62.38% higher removal efficiencies for COD, NH3-N, TN, and TP, respectively, and demonstrated 59.49%, 63.65%, and 45.35% greater removal efficiencies for E1, E2, and EE2, respectively. In zeolite-filled constructed wetlands, the removal efficiency of both conventional pollutants and estrogenic pollutants gradually improved with increasing HRT. Compared to the HRT of 12 hours, extending the HRT to 36 hours resulted in increases in the removal efficiencies of COD, NH3-N, TN, and TP by 20.12%, 20.22%, 10.98%, and 34.35%, respectively. Similarly, the removal efficiencies of E1, E2, and EE2 were enhanced by 43.68%, 37.75%, and 39.78%, respectively.
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