| In recent years, China’s rapid economic development and people’s living standards’ improving lead to the rapid growth of nitrogen-containing organic compounds emissions, rapid deterioration of water environment and water eutrophication problem’s getting worse. Dealing with high ammonia wastewater had a major role in the faster and better economic and social development. Traditional ammonia nitrogen removal process has some effect on the removal of ammonia nitrogen, but there are still many deficiencies. Shortcut nitrification and denitrification technology is a new technology which is developed in recent years, it has advantages of saving aeration, saving denitrification carbon, shortening the hydraulic retention time, reducing the amount of excess sludge and so on, which makes it get more attention.In this paper, we are using sequencing batch reactor (SBR) reactor, manually configure the analog high-ammonia wastewater, inoculated the sludge of Shenyang Northern Sewage Treatment Plant, control the temperature of 25±0.5℃, under the conditions of pH value is 7.5, DO at 1.0-2.0mg/L, through the way of intermittent aeration, and more than 30 days of acclimation training, we successfully reached the short-cut nitrification, and studied on the factors affecting shortcut nitrification.The factors of shortcut nitrification system includes DO concentration, temperature, pH, C/N and sludge age, etc., in this experiment, we maintained the temperature, pH, influent C/N and sludge age unchanged, study the results of shortcut nitrification by only changing the aeration. The results showed that the 3# reactor whose amount of aeration is 0.8L/min has a NH4+-N removal rate of over 95%, and NO2--N accumulation rate reached 94%, both of they is higher than thel# and 2# reactor whose amount of aeration is 0.4L/min and 0.6L/min.Control different anaerobic aerobic times through time controller, of which 1# reactor’s anaerobic time is 20min and aerobic time is 20min as well,2# reactor’s anaerobic time is 20min and aerobic time is 30min,3# reactor’s anaerobic time is 20min and aerobic time is 40min. The results showed that the effluent COD concentration of the three reactors is under 20mg/L, in line with the "urban sewage treatment plant pollutant discharge standard" (GB18918-2002) Standard, but 2# reactor has an ammonia removal efficiency of 98% and NO2--N accumulation rate of over 90% which is the best effect of three reactors.In the cycle experiment, we draw the conclusion that the 2# reactor’s accumulation of nitrite was better than 3# reactor during the entire period and it reached 50mg/L or more when the reaction come to 200min. Thus, anaerobic time is 20 minutes and aerobic time is 30 minutes (ie, anaerobic time:aerobic time=1:1.5) is the optimal proportion in the selected anaerobic and aerobic time, and it’s the best result for the realization of shortcut nitrification.In this paper, we’ve made kinetics analysis of shortcut nitrification activated sludge cultured by SBR reactor. The results show that the process of shortcut nitrification and denitrification can be represented by Monod model. The ammonia’s maximum ammonia oxidation of nitrification vmax=11.39mgNH4+-N/gMLSS/L, saturation constant KN=11.79mgNH4+-N/L; the maximum denitrification rate of nitrite qmax=0.00403mgNO2--N/mgVSS/h, saturation constant Ks=224.7mg/L. |
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