Achieving partial denitrification-anammox in biofilter for advanced wastewater treatment
Achieving partial denitrification-anammox in biofilter for advanced wastewater treatment
复制标题
在生物过滤器中实现部分反硝化-厌氧氨氧化，用于深度废水处理
DOI：
10.1016/j.envint.2020.105612
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发表时间：
2020-05-01
影响因子：
11.8
通讯作者：
Gu, Pengchao
中科院分区：
文献类型：
--
作者：
Cui, Bin;Yang, Qing;Gu, Pengchao
近年来，部分反硝化（PDN）-厌氧氨氧化（anammox）工艺在活性污泥处理硝酸盐废水中得到了广泛的研究。然而，在生物过滤器中实现PDN-Anammox用于生活废水处理从未有报道。在本研究中，建立了两个实验室规模的 PDN 生物过滤器和厌氧氨氧化生物过滤器来处理模拟生活废水。结果表明，脱氮效果稳定，出水平均氮含量为10.2 mg/L。亚硝酸盐还原酶基因丰度较低，可实现稳定的亚硝酸盐积累性能，而进水成分影响 PDN 生物过滤器中的氮转化途径。处理生活废水时，硝化和部分反硝化导致亚硝酸盐积累率较高，达75.4%。厌氧氨氧化生物滤池对脱氮的贡献率为74.6%，Candidatus Brocadia为优势属。经过长期运行，有限的底物浓度导致各种厌氧氨氧化菌之间的种间竞争，导致Candidatus Brocadia fulgida的比例不断增加。 PDN-厌氧氨氧化生物滤池是一种可行的废水深度处理工艺，可节省曝气消耗和碳源添加量，减少污泥产生。
Recently, partial denitrification (PDN) - anaerobic ammonium oxidation (anammox) process has been widely studied in activated sludge for nitrate wastewater treatment. However, achieving PDN-Anammox in biofilter for domestic wastewater treatment was never reported. In this study, two lab-scale PDN biofilter and Anammox biofilter were built up to treat simulated domestic wastewater. The results showed that stable nitrogen removal performance was kept with averaged effluent nitrogen of 10.2 mg/L. Stable nitrite accumulation performance was achieved with low abundance of nitrite reductase gene, while influent composition influenced nitrogen transformation pathway in PDN biofilter. When treating domestic wastewater, nitrification and partial denitrification led to the higher nitrite accumulation ratio of 75.4%. The percentage contribution of anammox biofilter was 74.6% for nitrogen removal, and Candidatus Brocadia was dominant genus. After long-term operation, limited substrate concentration caused interspecific competition among various anammox bacteria, leading to an increasing proportion of Candidatus Brocadia fulgida. PDN-Anammox biofilter is a feasible process to advanced wastewater treatment, which could save aeration consumption and carbon source addition, and reduce sludge production.