铁碳微电解及沸石组合人工湿地的废水处理效果

铁碳微电解填料和沸石由于对废水中污染物具有良好的处理效果，因而被作为基质逐渐运用于人工湿地中.本研究构建了铁碳微电解填料+砾石（湿地A）、铁碳微电解填料+沸石（湿地B）、沸石（湿地C）以及砾石（湿地D）为基质的4组人工湿地，并利用间歇曝气对湿地系统进行增氧，探究不同填料对人工湿地废水处理效果的影响.结果表明，与湿地D相比，铁碳微电解填料显著提高了湿地出水的溶解氧含量（DO）（P<0.05）和pH（P<0.05）；4组人工湿地对有机物的去除率均达到95%以上，且各组间不存在显著性差异（P>0.05）；对TN而言，湿地A、B和C的平均去除率分别比湿地D提高了7.94%（P<0.05）、9.29%（P<0.05）和3.63%（P<0.05），铁碳微电解填料和沸石对提升人工湿地TN去除效果的贡献率分别为73.55%和26.45%；各组湿地对NH₄⁺的平均去除率为67.93%~76.90%，与湿地D相比，其它3组湿地均明显改善了NH₄⁺的去除效果（P<0.05）；铁碳微电解填料对湿地NO₃^-的去除效果极佳，去除率高达99%以上，显著高于不添加铁碳微电解的人工湿地系统（P<0.05）.综合对碳氮污染物的处理效果来看，湿地B在间歇曝气的条件下对人工湿地中污染物去除效率最高.

Wastewater Treatment Effects of Ferric-carbon Micro-electrolysis and Zeolite in Constructed Wetlands

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, P<0.05) and pH (P<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% (P>0.05). For TN, the mean removal efficiency of CW-A,-B, and-C was 7.94% (P<0.05), 9.29% (P<0.05), and 3.63% (P<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 NH₄⁺ 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 NH₄⁺ (P<0.05). The ferric-carbon micro-electrolysis filler had an excellent removal effect on NO₃^-, with a removal efficiency of more than 99%, which was significantly higher than the constructed wetlands without ferric-carbon micro-electrolysis (P<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.