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Biofilm moving bed reactor (MBBR) as a novel biofilm wastewater treatment process, with the features and advantages of the self, the attention is gradually being. Compared with the activated sludge process, MBBR has a large load, high efficiency, less residual sludge, no sludge bulking. Water eutrophication problems have become increasingly prominent, strict water quality index system constantly sewage nitrogen and phosphorus removal has become a hot spot in the water pollution control, especially in for sewage Guangdong Province, it has a concentration of chemical oxygen demand , but exceeded the total nitrogen and total phosphorus characteristics. This thesis to simulate urban sewage treatment object, using a specific set of MBBR system, the removal of COD, TN and TP test research, and by changing the fill rate, hydraulic residence time and water-gas ratio investigated in different conditions under MBBR wastewater removal efficiency of COD, TN and TP, optimize the operating conditions of the reactor to provide a reference for the practical application of MBBR. Influent COD was 200 mg / L, TN 10 mg / L, TP 2mg / L case, the processing power of the reactor was investigated under various conditions. Experimental results show that: (1) at room temperature, when the total amount of filler material in the reactor is increased, the removal rate of the system on the various pollutants increase in the filling rate of 40% for the optimum condition, COD, TN and TP reached 79.94%, 43.91% and 49.33%, respectively. (2) to study the impact of hydraulic retention time of MBBR reactor, found that with the increase of the hydraulic retention time, the processing capacity of the entire system is growing, when the hydraulic retention time of 10 hours, the COD removal efficiency of 91.35 %, TN and TP removal rate was 50.26% and 56.57%. (3) increase the amount of aeration, and promote the flow turbulence, is conducive to the delivery and utilization of oxygen, but the gas is too high will lead to decline in oxygen utilization, water gas ratio should be taken as 1:18. (4) was found during experiments, pH is an important factor affecting the running of the whole system, when the pH is greater than 9 or less than 5:00, the entire processing capacity of the reactor is greatly decreased. (5) The reactor has a strong impact load capacity and the effluent quality is stable, when the COD concentration of 200mg / L mutation to 300mg / L or even 400mg / L, the system after a period of time to adapt still can reach more than 80% removal rate; TN concentration of from 10mg / L 20mg / L and 30 mg / L is suddenly increased, the reactor for TN can reach about 40%; from 2mg / L increased when the concentration of TP 3mg / L and 4mg / L, the removal rate of TP not changed much, and only a few percentage points lower. Experiment processing capabilities of the A / O process of Guangzhou Lijiao sewage treatment plant made a comparison, in addition to the TP superscalar, COD and TN removal effect is even better than the A / O process to reach the national standard of the People's Republic of China urban sewage treatment plant pollutant discharge standard (GB 18918-2002) \
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