一段式短程硝化-厌氧氨氧化耦合缓释碳源滤柱深度去除总氮

Advanced total nitrogen removal by the column of one-stage partial nitrification-anammox coupled slow-release carbon source

在SBR中进行一段式短程硝化-厌氧氨氧化工艺的启动驯化,并在达到稳定运行时,让SBR出水进入不同缓释碳源体积填充比的滤柱中,进行深度脱氮研究。结果表明,在SBR中经过176 d的启动驯化,成功实现一段式短程硝化-厌氧氨氧化工艺的稳定运行,进水NH_(4)^(+)-N为100 mg·L^(−1),NH_(4)^(+)-N去除率达98%,TN去除率达73%。AOB及Anammox菌活性分别提高至8.6 mg·(h·g)^(−1)和12.6 mg·(h·g)^(−1),而NOB活性小于1.0 mg·(h·g)^(−1);在15℃低温条件下的深度脱氮研究中,缓释碳源体积填充比为15%的滤柱具有最佳的脱氮效果,出水TN小于5 mg·L^(−1),平均出水COD值为19.3 mg·L^(−1),该滤柱中通过一段式短程硝化-厌氧氨氧化反应和反硝化反应的共同作用完成深度脱氮。SBR与缓释碳源体积填充比为15%的滤柱组成的耦合系统平均TN去除率达96.7%,较SBR提升了28.9%。

Sequencing batch reactor(SBR)was used to domesticate the one-stage partial nitrification-anammox process.When its stable operation happened,the SBR effluent entered the filter column with different volume fill ratios of slow-release carbon source for advanced nitrogen removal.The results showed that the stable operation of the one-stage partial nitrification-anammox process was successfully realized after 176 days of domestication in SBR.When the influent concentration of NH_(4)^(+)-N was 100 mg·L^(−1),the removal rates of NH_(4)^(+)-N and TN reached 98%and 73%,respectively.The activities of AOB and anammox bacteria increased to 8.6 mg·(h·g)^(−1) and 12.6 mg·(h·g)^(−1),respectively,while NOB activity was less than 1.0 mg·(h·g)^(−1).In the study of advanced nitrogen removal at low temperature of 15℃,the filter column with 15%volume fill ratio of slowrelease carbon source had the best advanced nitrogen removal effect,TN in the effluent was less than 5 mg·L^(−1)and the average COD in the effluent was 19.3 mg·L^(−1),and advanced nitrogen removal was realized by the combination of partial nitrification-anammox and denitrification in the filter column.The average TN removal rate was 96.7%for the coupled system of SBR and the filter column with 15%volume fill ratio of slow-release carbon source,which was 28.9%higher than that of SBR.