State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
Water Environ Res. 2021 Jun;93(6):865-874. doi: 10.1002/wer.1477. Epub 2020 Dec 10.
A lab-scale hybrid anoxic-oxic biofilm reactor (HAOBR) with one anoxic compartment and two oxic compartments in sequence was constructed to treat domestic wastewater in this study. Performance of the HAOBR was evaluated at 25°C and hydraulic retention time 12 hr with reflux ratio increased from 100% to 300% by stages. The results showed that COD, , and TN removal presented an increasing trend with the increase of reflux ratio by stages. At the optimal reflux ratio of 300%, removal of COD, , and TN averaged 83.9%, 99.0%, and 80.8%, respectively. Analysis about pollutant concentration in each compartment of the HAOBR revealed that the excellent pollutant removal was mainly achieved by the cooperation of nitrification in 3rd oxic compartment and denitrification in 1st anoxic compartment. Denitrification in the anoxic zone of 2nd oxic compartment would also contribute to the nitrogen removal. The higher nitrogen removal of the HAOBR at the reflux ratio of 300% is attributed to the presence of the anammox in the 1st anoxic compartment, which is mainly due to the lower COD concentration in the compartment at the higher reflux ratio. PRACTITIONER POINTS: A hybrid anoxic-oxic baffled reactor was built to treat domestic wastewater. Effect of reflux ratio and mechanism of nitrogen removal were investigated. Reflux ratio 300% was favorable for COD, and TN removal. The removal of COD, and TN averaged 84.4%, 99.0% and 80.8%, respectively. Cooperation of nitrification, denitrification and anammox dominated the high nitrogen removal at the higher reflux ratio of 300%.
本研究构建了一个带有一个缺氧区和两个好氧区的实验室规模混合缺氧-好氧生物膜反应器（HAOBR），以处理生活污水。在 25°C 和水力停留时间 12 小时的条件下，通过逐步增加回流比来评估 HAOBR 的性能，回流比从 100%增加到 300%。结果表明，随着回流比的逐步增加，COD、氨氮和 TN 的去除率呈上升趋势。在最佳回流比 300%时，COD、氨氮和 TN 的去除率平均分别为 83.9%、99.0%和 80.8%。对 HAOBR 各分区中污染物浓度的分析表明，优异的污染物去除主要是通过第三好氧分区的硝化作用和第一缺氧分区的反硝化作用的协同作用实现的。第二好氧分区缺氧区的反硝化作用也有助于氮的去除。在回流比为 300%时，HAOBR 的较高氮去除率归因于第一缺氧分区中存在的厌氧氨氧化作用，这主要是由于在较高回流比下分区中较低的 COD 浓度所致。从业者要点：构建了一种混合缺氧-好氧折流反应器来处理生活污水。研究了回流比和脱氮机制的影响。回流比 300%有利于 COD、氨氮和 TN 的去除。COD、氨氮和 TN 的去除率平均分别为 84.4%、99.0%和 80.8%。在较高的回流比 300%下，硝化、反硝化和厌氧氨氧化的协同作用主导了高氮去除。
