Zhao Zhong-Jing, Hao Qing-Ju, Zhang Yao-Yu, Xiong Wei-Xia, Zeng Wei, Chen Jun-Jiang, Jiang Chang-Sheng
State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, College of Resources and Environment, Southwest University, Chongqing 400716, China.
Key Laboratory of Eco-environment in the Three Gorges Reservoir Region, Ministry of Education, Chongqing 400715, China.
Huan Jing Ke Xue. 2021 Jun 8;42(6):2875-2884. doi: 10.13227/j.hjkx.202010200.
Ferric-carbon micro-electrolysis fillers and zeolite have been increasingly used as substrates in constructed wetlands due to their good wastewater pollution-removal efficiencies. To explore the effects of different fillers on wastewater treatment in constructed wetlands, four constructed wetlands were examined with vertical subsurface flow areas filled with ferric-carbon micro-electrolysis filler+gravel (CW-A), ferric-carbon micro-electrolysis filler+zeolite (CW-B), zeolite (CW-C), and gravel (CW-D). In addition, intermittent aeration was used to improve the dissolved oxygen (DO) environment. The results showed that, compared with CW-D, the ferric-carbon micro-electrolysis filler significantly increased the dissolved oxygen (DO, <0.05) and pH (<0.05) of the effluent from the wetlands. The mean removal efficiency of chemical oxygen demand (COD) in the four constructed wetlands were more than 95% (>0.05). For TN, the mean removal efficiency of CW-A,-B, and-C was 7.94% (<0.05), 9.29% (<0.05), and 3.63% (<0.05) higher than that of CW-D, respectively. The contribution of ferric-carbon micro-electrolysis filler and zeolite to improving the TN removal efficiency of the constructed wetlands was 73.55% and 26.45%, respectively. The mean removal efficiency of NH in the four wetlands ranged from 67.93% to 76.90%, and compared with CW-D, the other treatments significantly improved the removal efficiency of NH (<0.05). The ferric-carbon micro-electrolysis filler had an excellent removal effect on NO, with a removal efficiency of more than 99%, which was significantly higher than the constructed wetlands without ferric-carbon micro-electrolysis (<0.05). Considering the treatment effect of the organic pollutants and the nitrogen-containing pollutants, CW-B achieved the best removal efficiency in constructed wetlands with intermittent aeration.
铁碳微电解填料和沸石因其良好的废水污染去除效率，在人工湿地中越来越多地被用作基质。为了探究不同填料对人工湿地废水处理的影响，研究人员考察了四个垂直潜流区填充铁碳微电解填料+砾石（CW-A）、铁碳微电解填料+沸石（CW-B）、沸石（CW-C）和砾石（CW-D）的人工湿地。此外，采用间歇曝气来改善溶解氧（DO）环境。结果表明，与CW-D相比，铁碳微电解填料显著提高了湿地出水的溶解氧（DO，<0.05）和pH值（<0.05）。四个人工湿地中化学需氧量（COD）的平均去除效率均超过95%（>0.05）。对于总氮（TN），CW-A、-B和-C的平均去除效率分别比CW-D高7.94%（<0.05）、9.29%（<0.05）和3.63%（<0.05）。铁碳微电解填料和沸石对提高人工湿地总氮去除效率的贡献分别为73.55%和26.45%。四个湿地中氨氮（NH）的平均去除效率在67.93%至76.90%之间，与CW-D相比，其他处理显著提高了氨氮的去除效率（<0.05）。铁碳微电解填料对硝态氮（NO）具有优异的去除效果，去除效率超过99%，显著高于未使用铁碳微电解的人工湿地（<0.05）。综合考虑有机污染物和含氮污染物的处理效果，在间歇曝气的人工湿地中，CW-B的去除效率最佳。
