利用农业废弃物强化人工湿地处理污水处理厂尾水机理研究

为研究3种典型的农业废弃物（玉米芯、玉米秸秆和小麦秸秆）作为人工湿地外加碳源脱氮的可行性，利用三维荧光和高通量测序分析了植物碳源在人工湿地中促进废水脱氮的增强机制。结果表明：农业废弃物材料可以很好地释放有机碳，累计碳释放量为119.78~172.84 mg·g^-1，同时分解释放的溶解性有机物（Dissolved organic matter，DOMs）主要由腐植酸和黄腐酸组成。在添加农业废弃物的人工湿地中，TN去除效率提高了30.8%~41.2%，并且脱氮菌属Pseudomonas、Thauera等的相对丰度提高了16.38%~22.02%。添加玉米秸秆的人工湿地具有较好的脱氮效果。研究表明，利用农业废弃物作为人工湿地外部碳源处理污水处理厂尾水，可以显著降低尾水中TN，这也为农业废弃物的处理找到了一个新的出路。

Research on mechanism of utilizing agricultural waste to strengthen constructed wetland to treat tailwater of a sewage treatment plant

To investigate the feasibility of utilizing three typical agricultural waste materials（i.e., corn cobs, corn stalks, and wheat straw） as external carbon sources for denitrification in constructed wetlands, the enhancement mechanism of plant carbon sources in promoting nitrogen removal from wastewater was analyzed using three-dimensional fluorescence and high-throughput sequencing. The results showed that agricultural waste materials can release organic carbon effectively, with an accumulated carbon release of 119.78-172.84 mg·g^-1. The dissolved organic matter（DOMs）decomposed and released mainly consisted of humic acid and fulvic acid. In the constructed wetlands with added agricultural waste materials, the removal efficiency of TN increased by 30.8% - 41.2%, and the relative abundance of denitrifying bacteria genera such as Pseudomonas and Thauera increased by 16.38%-22.02%. The constructed wetland with added corn stalks represented better denitrification performance. Utilizing agricultural waste materials as external carbon sources in constructed wetlands for treating tailwater from sewage treatment plants can significantly reduce the TN concentration in the effluent, providing a new avenue for agricultural waste treatment.