Institute for Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Guangdong, 518055, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
Institute for Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Guangdong, 518055, China.
J Hazard Mater. 2020 Jan 15;382:121091. doi: 10.1016/j.jhazmat.2019.121091. Epub 2019 Aug 23.
In this study, we proposed to apply an integrated process which is comprised of in situ ozonation, ceramic membrane filtration (CMF) and biologically active carbon (BAC) filtration to wastewater reclamation for indirect potable reuse purpose. A pilot-scale (20 m/d) experiment had been run for ten months to validate the prospect of the process in terms of treatment performance and operational stability. Results showed that the in situ O + CMF + BAC process performed well in pollutant removal, with chemical oxygen demand, ammonia, nitrate nitrogen, total phosphorus and turbidity levels in the treated water being 5.1 ± 0.9, 0.05 ± 0.01, 10.5 ± 0.8, <0.06 mg/L, and <0.10 NTU, respectively. Most detected trace organic compounds were degraded by>96%. This study demonstrated that synergistic effects existed in the in situ O + CMF + BAC process. Compared to pre-ozonation, in situ ozonation in the membrane tank was more effective in controlling membrane fouling (maintaining operational stability) and in degrading organic pollutants, which could be attributed to the higher residual ozone concentration in the tank. Because of the removal of particulate matter by CMF, water head loss of the BAC filter increased slowly and prolonged the backwashing interval to 30 days. BAC filtration was also effective in removing ammonia and N-nitrosodimethylamine from the ozonated water.
在这项研究中，我们提出应用一个集成工艺，该工艺由原位臭氧氧化、陶瓷膜过滤（CMF）和生物活性炭（BAC）过滤组成，用于废水再生以实现间接饮用水再利用的目的。进行了为期十个月的中试规模（20 立方米/天）试验，以验证该工艺在处理性能和运行稳定性方面的前景。结果表明，原位 O+CMF+BAC 工艺在去除污染物方面表现良好，处理水中的化学需氧量、氨、硝酸盐氮、总磷和浊度分别为 5.1±0.9mg/L、0.05±0.01mg/L、10.5±0.8mg/L、<0.06mg/L 和<0.10NTU。大多数检测到的痕量有机化合物的降解率>96%。本研究表明，原位 O+CMF+BAC 工艺存在协同效应。与预臭氧化相比，膜罐中的原位臭氧氧化在控制膜污染（维持运行稳定性）和降解有机污染物方面更有效，这可归因于罐中更高的剩余臭氧浓度。由于 CMF 去除了颗粒物，BAC 过滤器的水头损失增加缓慢，延长了反冲洗间隔至 30 天。BAC 过滤对于去除臭氧处理水中的氨和 N-亚硝基二甲胺也很有效。
