Zhong Kun, Luo Yi-Yong, Wu Zheng-Song, He Qiang, Hu Xue-Bin, Jie Qi-Wu, Li Yan-Ting, Wang Shao-Jie
Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, 400045, China; and Southwest Municipal Engineering Design and Research Institute of China, Chengdu, 610081, China E-mail:
Water Sci Technol. 2016 Oct;74(7):1553-1560. doi: 10.2166/wst.2016.357.
A vertical flow constructed wetland was combined with a biological aerated filter to develop an ecological filter, and to obtain the optimal operating parameters: The hydraulic loading was 1.55 m/(m·d), carbon-nitrogen ratio was 10, and gas-water ratio was 6. The experimental results demonstrated considerable removal efficiency of chemical oxygen demand (COD), ammonia nitrogen (NH-N), total nitrogen (TN), and total phosphorus (TP) in wastewater by the ecological filter, with average removal rates of 83.79%, 93.10%, 52.90%, and 79.07%, respectively. Concentration of NH-N after treatment met the level-A discharge standard of GB18918-2002. Compared with non-plant filter, the ecological filter improved average removal efficiency of COD, NH-N, TN, and TP by 13.03%, 25.30%, 14.80%, and 2.32%, respectively: thus, plants significantly contribute to the removal of organic pollutants and nitrogen. Through microporous aeration and O secretion of plants, the ecological filter formed an aerobic-anaerobic-aerobic alternating environment; thus aerobic and anaerobic microbes were active and effectively removed organic pollutants. Meanwhile, nitrogen and phosphorus were directly assimilated by plants and as nutrients of microorganisms. Meanwhile, pollutants were removed through nitrification, denitrification, filtration, adsorption, and interception by the filler. High removal rates of pollutants on the ecological filter proved that it is an effective wastewater-treatment technology for decentralized wastewater of mountainous towns.
将垂直流人工湿地与曝气生物滤池相结合，构建了一种生态滤池，并得出了最佳运行参数：水力负荷为1.55米/(米·天)，碳氮比为10，气水比为6。实验结果表明，该生态滤池对废水中的化学需氧量(COD)、氨氮(NH₃-N)、总氮(TN)和总磷(TP)具有较高的去除效率，平均去除率分别为83.79%、93.10%、52.90%和79.07%。处理后NH₃-N的浓度达到GB18918-2002一级排放标准。与无植物滤池相比，该生态滤池对COD、NH₃-N、TN和TP的平均去除效率分别提高了13.03%、25.30%、14.80%和2.32%：因此，植物对有机污染物和氮的去除有显著贡献。通过微孔曝气和植物的泌氧作用，该生态滤池形成了好氧-厌氧-好氧交替环境；因此好氧和厌氧微生物活性高，能有效去除有机污染物。同时，氮和磷被植物直接吸收并作为微生物的养分。与此同时，污染物通过硝化、反硝化、过滤、吸附和填料截留作用被去除。生态滤池对污染物的高去除率证明了它是一种处理山区城镇分散式废水的有效污水处理技术。
