School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China.
School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China.
Bioresour Technol. 2020 Aug;310:123344. doi: 10.1016/j.biortech.2020.123344. Epub 2020 Apr 8.
Agricultural drainage ditches can prevent flooding and mitigate agricultural pollution; however, the performance is unsatisfactory in plateau areas like the Dianchi Lake basin. Thus, a novel double-layer ditch system (DDS) with a fibrous packing as biofilm carriers was developed to form the carrier-attached biofilms and enhance the pollutant removal. The results indicated the DDS performed better than a single-layer ditch system, and annual average removal efficiencies of TN, NO-N, NH-N, TP, COD and SS were 18.61%, 17.13%, 7.74%, 11.90%, 11.95% and 23.71%, respectively. High amount and carbon, nitrogen and phosphorus contents of biofilms are favourable to pollutant removal by DDS. Although bacterial diversity of biofilms remained relatively stable throughout the year, the relative abundance of dominant assemblages varied greatly. Denitrifying microorganisms affiliated with Bacteroidetes might contribute to effective NO-N reduction. This study demonstrates DDS performed well and provides a novel method for application of biofilm carriers in drainage ditches.
农业排水沟可以防止洪水和减轻农业污染；然而，在滇池盆地等高原地区，其性能并不令人满意。因此，开发了一种新型双层沟渠系统（DDS），其中纤维填料作为生物膜载体，以形成载体附着生物膜并增强污染物去除。结果表明，DDS 的性能优于单层沟渠系统，TN、NO-N、NH-N、TP、COD 和 SS 的年平均去除效率分别为 18.61%、17.13%、7.74%、11.90%、11.95%和 23.71%。生物膜中大量的碳、氮和磷含量有利于 DDS 去除污染物。尽管生物膜的细菌多样性全年保持相对稳定，但主要菌群的相对丰度变化很大。与拟杆菌门相关的反硝化微生物可能有助于有效减少 NO-N。本研究表明 DDS 性能良好，并为生物膜载体在排水沟中的应用提供了一种新方法。
