管式纳滤膜MBR废水处理工艺研究

发布时间：2018-08-01 16:31

【摘要】：自上世纪60年代,第一个商用MBR能以开发利用,如今各式各样的膜生物处理器已被广泛应用于城市污水处理领域。目前大部分的MBR采用的是微滤膜或者是超滤膜,但是随着近年污水排放标准的提高,经过现有MBR处理后的污水往往达不到有关规定的要求,需要再经过纳滤或反渗透等技术的进一步处理。本实验直接将管式纳滤膜直接应用于膜生物处理器中,配置浓度近似城市污水的实验室污水,观察在相似条件下对超滤MBR与纳滤MBR对于污水的处理效果,探究纳滤MBR独自运行的可行性。结果如下:(1)针对COD,不论是超滤MBR还是纳滤MBR都很很高的去除率,可以稳定在9 5%以上。而且纳滤MBR的出水效果要略好于超滤MB R,其受池中有机物浓度变化的影响更小。而应对进水浓度的突然提高时,两者都表现出很好的适应性,出水没有产生大的波动。(2)在好氧池中,氨氮的去除效果都不是很理想。尤其是超滤MBR的出水和反应池污水相比并没有明显降低,有时甚至会出现升高的情况。而纳滤MBR的出水虽然会一直保持低于池中的污水,但是膜去除率也只是在30%左右,而当进水中氨氮浓度突然提高时,整体去除率有明显的下降趋势。(3)在经过前期的波动后,在40天的周期内MBR的通量虽然都略有下降,但也基本保持稳定。但若是停止运行的时间过长在开启时两者的出水量都会明显下降,恢复效果也不理想。所以短期稳定运行时,纳滤MBR具有可实施性。
[Abstract]:Since the 1960s, the first commercial MBR can be developed and utilized. Nowadays, a variety of membrane bioprocessors have been widely used in the field of municipal sewage treatment. At present, most of MBR uses microfiltration membrane or ultrafiltration membrane, but with the improvement of sewage discharge standards in recent years, the sewage treated by existing MBR often does not meet the requirements of relevant regulations. Further treatment by nanofiltration or reverse osmosis is required. In this experiment, the tubular nanofiltration membrane was directly applied to the membrane bioprocessor, and the treatment effect of ultrafiltration MBR and nanofiltration MBR on sewage was observed under similar conditions. Explore the feasibility of nanofiltration MBR operating alone. The results are as follows: (1) for COD, the removal rate of both ultrafiltration MBR and nanofiltration MBR is very high, which can be stabilized at more than 9.5%. Moreover, the effluent effect of nanofiltration MBR was slightly better than that of ultrafiltration MB R.It was less affected by the change of organic matter concentration in the tank. In response to the sudden increase of influent concentration, both of them showed good adaptability, and the effluent did not fluctuate greatly. (2) in aerobic tank, the removal effect of ammonia nitrogen was not very good. Especially, the effluent of ultrafiltration MBR is not obviously lower than that of reactor sewage, and sometimes it even increases. Although the effluent of nanofiltration MBR will always be lower than that of the wastewater in the pond, the membrane removal rate is only about 30%, and when the concentration of ammonia nitrogen in the influent suddenly increases, the overall removal rate has an obvious downward trend. (3) after the early period of fluctuation, Although the flux of MBR decreased slightly in the 40-day cycle, it also remained stable. However, if the time of stopping operation is too long, the water output of both will obviously decrease, and the recovery effect is not satisfactory. Therefore, nanofiltration MBR can be implemented in short-term stable operation.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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