School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China E-mail:
Water Sci Technol. 2022 Sep;86(5):1153-1167. doi: 10.2166/wst.2022.246.
P-nitrophenol (PNP) is highly toxic and difficult to degrade, causing great harm to the ecological environment and human health. A two-stage bench-scale membrane biofilm reactor (MBfR) was constructed to treat wastewater containing high concentration of PNP and the generated nitrogen without external organic carbon sources. The two reactors were supplied with oxygen and methane, respectively. O-MBfR was used for the degradation of PNP and the improvement of wastewater biodegradability. CH-MBfR was used for the total nitrogen (TN) removal treatment from O-MBfR effluent. In this experiment, the performance of the two-stage MBfR process was evaluated and optimized by adjusting operational parameters (aeration pressure, HRT, and pH). Under the optimal operation parameters, the removal efficiencies of PNP (100 mg/L) and TN attained 89.70% and 69.24%, respectively, and the removal loads were 0.930 g·m·d and 241.42 mg·m·d, respectively. The reactor was able to accommodate the concentrations of PNP up to 200-400 mg/L, and the reactor reached maximum efficiency throughout the process when the concentration of PNP in the wastewater was 250 mg/L. The removal rates of PNP and TN reached 95.0% and 69.48%, respectively, and the removal loads were 2.37 g·m·d and 96.22 mg·m·d, respectively. This research provides a better solution for multi-MBfR to treat toxic industrial wastewater containing phenol, nitrophenol, and further TN removal, which would not release any air pollutants into the atmosphere.
对硝基苯酚（PNP）是一种毒性很强且难以降解的物质，对生态环境和人类健康造成了极大的危害。本研究构建了一个两级膜生物膜反应器（MBfR），用于处理含有高浓度 PNP 和生成氮的废水，且无需外加有机碳源。两个反应器分别供应氧气和甲烷。O-MBfR 用于 PNP 的降解和提高废水的生物降解性。CH-MBfR 用于从 O-MBfR 流出物中去除总氮（TN）。在本实验中，通过调整操作参数（曝气压力、HRT 和 pH）来评估和优化两级 MBfR 工艺的性能。在最佳操作参数下，PNP（100mg/L）和 TN 的去除效率分别达到 89.70%和 69.24%，去除负荷分别为 0.930g·m·d 和 241.42mg·m·d。该反应器能够承受高达 200-400mg/L 的 PNP 浓度，当废水中 PNP 浓度为 250mg/L 时，整个过程中反应器达到最大效率。PNP 和 TN 的去除率分别达到 95.0%和 69.48%，去除负荷分别为 2.37g·m·d 和 96.22mg·m·d。本研究为多 MBfR 处理含酚、硝基酚和进一步去除 TN 的有毒工业废水提供了更好的解决方案，不会向大气中释放任何空气污染物。
