Lü Liang, Zhao Shi-Hui, Wei Jia-Min, Zhang Min, You Wen, Wu Peng, Shen Yao-Liang
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215009, China.
Huan Jing Ke Xue. 2017 Dec 8;38(12):5154-5161. doi: 10.13227/j.hjkx.201706153.
The operational control conditions for realizing shortcut nitrification in the membrane bioreactor (MBR) process was investigated in a lab-scale anaerobic baffled reactor (ABR)-MBR combined system, which laid the foundation for further research on the performance of denitrification phosphorus removal in the system. The experimental results under different conditions showed that shortcut nitrification in the MBR was achieved by controlling the dissolved oxygen (DO) concentration to low levels (0.5-1.0 mg·L to 0.3-0.7 mg·L) and changing the effective volume of the MBR to control hydraulic retention time (HRT), with the HRT in the ABR equal to 6 h, sludge reflux ratio of 100%, NO-N reflux ratio of 300%, and temperature of 30℃±2℃. Finally, the shortcut nitrification deteriorated as the HRT in the MBR increased from 3 h to 5 h, with nitrite accumulation rate dramatically dropping from 60% to 15%. The analysis of the influencing factors of shortcut nitrification showed that maintaining low DO concentration (0.3-0.7 mg·L) and gradually shortening HRT were the key factors. The pH, free ammonia (FA), free nitrous acid (FNA), temperature, and sludge retention time (SRT) had a slightly positive effect on shortcut nitrification. During the period of shortcut nitrification, a stable and high efficiency removal of COD and NH-N were achieved, and the average concentration of the effluent of COD and NH-N, whose removal rates were above 90%, were below 50 mg·L and 2 mg·L, respectively, and the removal efficiency of total nitrogen (TN) reached 72%.
在实验室规模的厌氧折流板反应器（ABR）-膜生物反应器（MBR）组合系统中，研究了膜生物反应器（MBR）工艺实现短程硝化的运行控制条件，为进一步研究该系统的反硝化除磷性能奠定了基础。不同条件下的实验结果表明，通过将溶解氧（DO）浓度控制在较低水平（0.5 - 1.0mg·L至0.3 - 0.7mg·L），并改变MBR的有效体积以控制水力停留时间（HRT），可实现MBR中的短程硝化，其中ABR中的HRT等于6h，污泥回流比为100%，NO-N回流比为300%，温度为30℃±2℃。最后，随着MBR中HRT从3h增加到5h，短程硝化恶化，亚硝酸盐积累率从60%急剧下降到15%。对短程硝化影响因素的分析表明，保持低DO浓度（0.3 - 0.7mg·L）并逐渐缩短HRT是关键因素。pH、游离氨（FA）、游离亚硝酸（FNA）、温度和污泥停留时间（SRT）对短程硝化有轻微的正向影响。在短程硝化期间，实现了对COD和NH-N的稳定高效去除，COD和NH-N出水的平均浓度分别低于50mg·L和2mg·L，去除率均高于90%，总氮（TN）去除效率达到72%。
