Abstract：
High nitrate content limits the recycling of the secondary effluent of wastewater treatment plants. In the research, one biomass-iron mixture (BIM) filter material based on mixotrophic denitrification mode (heterotrophic and iron-driven autotrophic denitrification) was developed and used to construct a novel denitrification biological filter (BIM-DNBF) for the nitrogen removal of secondary effluent. BIM-DNBF had a short start-up time (approximately 9 days), and high total nitrogen removal (81 %-89 %) without external addition of organic carbon sources during the whole operation. The coexistence of dominant heterotrophic-denitrification-like Pseudomonas and Erysipelothrix as well as iron-driven autotrophic-denitrification-like Citrobacter, Acidovorax, etc. were found in the BIM-DNBF. Moreover, biomass was recognized as one key player in promoting the reduction of Fe3+ to Fe2+, thereby facilitating the occurrence of iron-driven autotrophic denitrification. In addition, BIM-DNBF was assessed to be affordable. These findings provide evidence that BIM-DNBF can be an efficient technology for nitrogen removal of secondary effluent.
摘要：
高硝酸盐含量限制了污水处理厂二级流出物的回收利用。在研究中,开发了一种基于混养反硝化模式（异养和铁驱动自养反硝化）的生物质-铁混合物（BIM）滤料，并将其用于构建新型反硝化生物滤池（BIM-DNBF），用于二级出水的脱氮。BIM-DNBF启动时间短（约9天），在整个运行过程中，无需外部添加有机碳源，即可实现较高的总氮去除率（81％-89％）。显性异养反硝化样假单胞菌和赤毒杆菌以及铁驱动的自养反硝化样柠檬酸杆菌共存，Acidovorax,等。在BIM-DNBF中发现。此外，生物质被认为是促进Fe3+还原为Fe2+的关键因素之一，从而促进铁驱动自养反硝化的发生。此外,BIM-DNBF被评估为负担得起。这些发现为BIM-DNBF可以成为二级出水脱氮的有效技术提供了证据。
