College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China.
China Southwest Architectural Design and Research Institute, Chengdu 610041, China.
Bioresour Technol. 2024 Sep;408:131194. doi: 10.1016/j.biortech.2024.131194. Epub 2024 Jul 31.
The polymer-based denitrification system is an effective nitrate removal process for treating low carbon/nitrogen wastewater. However, in polymer denitrification systems, carbon used for the denitrification reaction is weakly targeted. Improving the efficiency of carbon utilization in denitrification is important to reduce carbon wastage. In this study, a symbiotic biofilm-sludge denitrification system was constructed using polycaprolactone as electron donors. Results show that the carbon release amount in 120 days was 85.32±0.46 g, and the unit mass of polycaprolactone could remove 1.55±0.01 g NO-N. Meaningfully, the targeted carbon utilization efficiency for denitrification could achieve 79%-85%. The quantitative results showed that the release of electron donors can be well matched to the demand for electron acceptors in the biofilm-sludge denitrification system. Overall, the symbiotic system can improve the nitrate removal efficiency and reduce the waste of carbon source.
基于聚合物的反硝化系统是一种处理低碳/氮废水的有效硝酸盐去除工艺。然而，在聚合物反硝化系统中，用于反硝化反应的碳的靶向性较弱。提高反硝化过程中碳利用效率对于减少碳浪费非常重要。本研究构建了一种以聚己内酯为电子供体的共生生物膜-污泥反硝化系统。结果表明，在 120 天内碳的释放量为 85.32±0.46g，单位质量的聚己内酯可以去除 1.55±0.01g 的 NO-N。有意义的是，反硝化的靶向碳利用效率可以达到 79%-85%。定量结果表明，电子供体的释放可以很好地与生物膜-污泥反硝化系统中电子受体的需求相匹配。总的来说，共生系统可以提高硝酸盐去除效率，减少碳源浪费。
