College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China.
College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China.
Bioresour Technol. 2022 Oct;362:127846. doi: 10.1016/j.biortech.2022.127846. Epub 2022 Aug 27.
Simultaneous removal of NH-N, NO-N, COD, and P by manganese redox cycling in nutrient wastewater was established with a single-stage moving bed biofilm reactor (MBBR) under low C/N ratio. When sodium succinate replaced the conventional denitrifying carbon source, removal efficiencies of TN, NO-N, NH-N, TP, and Mn were 65.13 %, 79.63 %, 92.79 %, 51.57 %, and 68.10 %, respectively. Based on modified Stover-Kincannon model, 11.03 and 10.05 mg TN·L·h of U values were obtained with sodium acetate and sodium succinate as substrates. Extracellular polymeric substances were used to evaluate the characteristics of biofilm, and microbial community of biofilm was identified. Transformation processes of NO-N, NH-N, Mn, and P were investigated, suggesting that the main functional groups (e.g., CO, Mn-O, and CN bonds) participated in N, P, and Mn removal, and MnO was the main component of biogenic manganese oxides. This study provides a new strategy for nutrients removal by Mn driven MBBR.
在低 C/N 比条件下，采用单级移动床生物膜反应器（MBBR），通过锰的氧化还原循环同时去除营养废水中的 NH-N、NO-N、COD 和 P。当用琥珀酸钠代替传统的反硝化碳源时，TN、NO-N、NH-N、TP 和 Mn 的去除效率分别为 65.13%、79.63%、92.79%、51.57%和 68.10%。基于改进的 Stover-Kincannon 模型，用乙酸钠和琥珀酸钠作为底物时，U 值分别为 11.03 和 10.05 mg TN·L·h。利用胞外聚合物来评估生物膜的特性，并鉴定生物膜的微生物群落。考察了 NO-N、NH-N、Mn 和 P 的转化过程，表明主要功能基团（如 CO、Mn-O 和 CN 键）参与了 N、P 和 Mn 的去除，MnO 是生物生成的锰氧化物的主要成分。本研究为 Mn 驱动的 MBBR 去除营养物提供了一种新策略。
