管式納濾膜MBR廢水處理工藝研究
發(fā)布時間：2018-08-01 16:31
【摘要】：自上世紀60年代,第一個商用MBR能以開發(fā)利用,如今各式各樣的膜生物處理器已被廣泛應用于城市污水處理領域。目前大部分的MBR采用的是微濾膜或者是超濾膜,但是隨著近年污水排放標準的提高,經過現有MBR處理后的污水往往達不到有關規(guī)定的要求,需要再經過納濾或反滲透等技術的進一步處理。本實驗直接將管式納濾膜直接應用于膜生物處理器中,配置濃度近似城市污水的實驗室污水,觀察在相似條件下對超濾MBR與納濾MBR對于污水的處理效果,探究納濾MBR獨自運行的可行性。結果如下:(1)針對COD,不論是超濾MBR還是納濾MBR都很很高的去除率,可以穩(wěn)定在9 5%以上。而且納濾MBR的出水效果要略好于超濾MB R,其受池中有機物濃度變化的影響更小。而應對進水濃度的突然提高時,兩者都表現出很好的適應性,出水沒有產生大的波動。(2)在好氧池中,氨氮的去除效果都不是很理想。尤其是超濾MBR的出水和反應池污水相比并沒有明顯降低,有時甚至會出現升高的情況。而納濾MBR的出水雖然會一直保持低于池中的污水,但是膜去除率也只是在30%左右,而當進水中氨氮濃度突然提高時,整體去除率有明顯的下降趨勢。(3)在經過前期的波動后,在40天的周期內MBR的通量雖然都略有下降,但也基本保持穩(wěn)定。但若是停止運行的時間過長在開啟時兩者的出水量都會明顯下降,恢復效果也不理想。所以短期穩(wěn)定運行時,納濾MBR具有可實施性。
[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.
【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703
本文編號：2158168
[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.
【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703
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