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Low winter temperatures of the northern region , the assimilative capacity of the natural water body is weak , and traditional wastewater treatment processes due to the low temperature , poor water quality , further aggravating the natural water body burden , improve sewage plant point source pollution treatment effect on river restoration , water quality improvement of great significance . MBR process has a high amount of sludge , high processing efficiency , less efficient Interception of the film , the production of excess sludge many advantages, such as low temperature sewage treatment effect has been more and more attention and application . This article will focus on the performance of the MBR process of sewage treatment at low temperatures are analyzed and discussed , and optimization of operating parameters . First in small test trials analog water plant raw water quality , effects of HRT and DO MBR process when the low temperature effect in 8-13 ℃ low temperature environment . Examine HRT water effects found from 4h to 10h when the reactor HRT treatment effect of COD increased in the HRT was 6h and above , the removal rate of more than 88% in less than 50mg / L effluent . Ammonia also improve along with the extension of the treatment effect of HRT , the HRT 8h and above , the water content of less than 5mg / L . Total nitrogen removal effect in a short HRT with HRT prolonged increase, and vice versa in the longer HRT 8h achieve the best treatment effect , the removal rate of 62% in the HRT . HRT of 10h , the organic load decreases , the relative lack of impact of the carbon source simultaneous nitrification and denitrification effect nitrate accumulation affect the total nitrogen treatment effect . Examine the DO water effects found DO on COD removal has little effect , the removal rate of more than 90% . Ammonia with the DO increase the removal efficiency of a slight increase , DO 1mg / L , the removal rate of 82.5% . TN removal efficiency with DO increases decline achieve the best removal efficiency DO 1mg / L , the removal rate of 68% , due to the DO high inhibition of the denitrification process , nitrate massive accumulation affect the total nitrogen removal efficiency . Design based on a small test run parameters in a pilot , the pilot system HRT of 8h . DO 1mg / L or so , the system has better removal of COD removal efficiency of 90% ammonia removal efficiency of 85 % , the other outside the sludge cycle to improve the removal of phosphorus removal rate more than 75% . Run shorter , denitrifying bacteria accumulated enough total nitrogen removal less effective , further training , to be later studies .
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