School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China.
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China.
Chemosphere. 2021 Oct;280:130726. doi: 10.1016/j.chemosphere.2021.130726. Epub 2021 Apr 30.
On the basis of the metabolic synergy between autotrophic denitrification (AuDen) and anaerobic ammonium oxidation (Anammox), the feasibility of a novel ferrous sulfide (FeS)-driven AuDen and Anammox coupled system (FS-DADAS) was investigated. The nitrogen removal performance of FS-DADAS was investigated in a lab-scale fluidized bed bioreactor fed with synthetic wastewater containing NH-N and NO-N. The results of long-term operation (120 days) demonstrated the promising performance of the system with 100% NO-N removal and NH-N concentrations lower than 8.11 mg L in the effluent at a nitrogen loading rate of 0.20 g-N·(L·d). Sufficient NO-N was provided by the AuDen for Anammox where a high removal rate of total nitrogen (TN) was achieved. The contribution of Anammox to TN removal was at >80%. The reactor could maintain a stable pH with less SO production owing to the fact that Fe(II) and S acted as electron donors. FeS gradually transformed into a sheet-like secondary mineral, FeOOH. AuDen (Thiobacillus) and Anammox bacteria (Candidatus Kuenenia) were successfully retained in the bioreactor, with relative abundance values of 18.82%-23.64% and 3.52%-8.67%, respectively. FS-DADAS is a promising technology for the complete removal of TN from wastewaters with low C/N ratios at low energy consumption.
基于自养反硝化（AuDen）和厌氧氨氧化（Anammox）之间的代谢协同作用，研究了一种新型硫化亚铁（FeS）驱动的 AuDen 和 Anammox 偶联系统（FS-DADAS）的可行性。在一个以含有 NH4-N 和 NO2-N 的合成废水为进料的实验室规模流化床生物反应器中，对 FS-DADAS 的脱氮性能进行了研究。长期运行（120 天）的结果表明，该系统具有良好的性能，在氮负荷率为 0.20 g-N·（L·d）时，出水的 100%NO3-N 去除率和低于 8.11 mg·L-1的 NH4-N 浓度。AuDen 为 Anammox 提供了足够的 NO3-N，从而实现了总氮（TN）的高去除率。Anammox 对 TN 的去除贡献大于 80%。由于 Fe(II)和 S 充当电子供体，因此该反应器可以保持稳定的 pH 值，并且产生的 SO42-较少。FeS 逐渐转化为片状次生矿物 FeOOH。AuDen（硫杆菌）和 Anammox 细菌（卡氏真杆菌）成功地保留在生物反应器中，相对丰度值分别为 18.82%-23.64%和 3.52%-8.67%。FS-DADAS 是一种很有前途的技术，可以在低能耗条件下，从低 C/N 比的废水中完全去除 TN。
