厌氧氨氧化菌
反硝化
硝化作用
环境化学
硝酸盐
化学
污水处理
废水
亚硝酸盐
细菌
环境工程
制浆造纸工业
氮气
反硝化细菌
环境科学
生物
有机化学
遗传学
工程类
作者
Yunlong Su,Yongzhen Peng,Jiao Wang,Qiong Zhang,Xiyao Li,Shuying Wang,Xiaofei Xue,Rui Du
标识
DOI:10.1016/j.scitotenv.2022.158973
摘要
The stable nitrite (NO2−-N) generation and rapid startup of anammox-based process are the main bottlenecks hindering its application in mainstream municipal wastewater treatment. In this study, a Partial-Denitrification (PD) system reducing nitrate (NO3−-N) to NO2−-N was rapidly developed within 40 days, using the nitrification/denitrification sludge from wastewater treatment plant. The NO3−-N to NO2−-N transformation ratios achieved 80.6 %. Significantly, a fast self-enrichment of anammox bacteria in this system was subsequently obtained, resulting in the successful transformation to an efficient PD/Anammox (PD/A) process after 79-day operation. The total nitrogen removal efficiency increased from 12.4 % to 90.0 % with influent ammonia and nitrate of 45.9 mg N/L and 62.2 mg N/L, corresponding to the anammox activity significantly increasing to 6.0 mgNH4+-N/g VSS/h without seeding anammox sludge. Abundance of anammox increased from 6.7 × 108 to 2.0 × 1011 copies/g dry sludge. High-throughput sequencing results showed that Candidatus Brocadia was the only known anammox genus and accounted for 1.08 % during the PD/A stage. Functional bacteria for PD, assumed to be the Thauera, was enriched from 1.99 % to 60.06 % but decreased to 32.49 % during the improvement of anammox activity. It demonstrated that the PD system with stable NO2−-N accumulation enabled a rapid self-enrichment of anammox bacteria and sufficient nitrogen removal with ordinary nitrification/denitrification sludge. This provides new insights into the scaling application of anammox by integrating PD with shortened startup periods and improved TN removal efficiency.
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