Integration of denitrifying phosphorus removal via nitrite pathway, simultaneous nitritation-denitritation and anammox treating carbon-limited municipal sewage.
Integration of denitrifying phosphorus removal via nitrite pathway, simultaneous nitritation-denitritation and anammox treating carbon-limited municipal sewage.
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DOI：
10.1016/j.biortech.2014.09.061
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发表时间：
2014-11
影响因子：
11.4
通讯作者：
W. Zeng;Boxiao Li;Xiang-dong Wang;Xinlong Bai;Yongzhen Peng
中科院分区：
文献类型：
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作者：
W. Zeng;Boxiao Li;Xiang-dong Wang;Xinlong Bai;Yongzhen Peng
在不投加外加碳源的情况下，对碳限制的城市污水中的营养盐去除率可达90%以上。实现亚硝化是提高脱氮效果的前提。以亚硝酸盐为电子受体的反硝化除磷是缺氧区的主要途径，其脱氮率可达60%以上，平均反硝化除磷率为88%。同时进行亚硝化/反硝化和厌氧氨氧化（anammox），好氧区脱氮率可达26-36%。定量PCR检测结果表明，亚硝化条件下厌氧氨氧化菌的丰度高于完全硝化条件下。厌氧氨氧化菌的最大数量为1.32 × 106 copies/gVSS，在255天内增加了5.6倍。好氧区17 mg/L的亚硝酸盐浓度对厌氧氨氧化菌有抑制作用。定量结果表明可能发生厌氧氨氧化。基于亚硝化的特性，异养反硝化与自养脱氮相结合是提高碳源受限废水中营养物去除效果的有效策略。
High nutrients removal above 90% from carbon-limited municipal sewage was obtained without adding external carbon source. Achieving nitritation was a prerequisite to improve nutrients removal. Denitrifying phosphorus (P) removal using nitrite as electron acceptor was the key pathway in anoxic zone, where nitrogen removal reached above 60% and average denitrifying P removal was 88%. Simultaneous nitritation/denitritation and anaerobic ammonia oxidation (anammox) possibly contributed to nitrogen removal of 26–36% in aerobic zone. Quantitative PCR assays presented that the abundance of anammox bacteria under nitritation was more than that under complete nitrification. The largest amount of anammox bacteria was 1.32 × 106copies/g VSS, about 5.6 times increase over a period of 255 days. Nitrite concentration of 17 mg/L in aerobic zone inhibited anammox bacteria. Quantitative results suggested possible occurrence of anammox. Based on performance of nitritation, combining heterotrophic denitrification with autotrophic nitrogen removal is an effective strategy to improve nutrients removal from carbon-limited wastewater.