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Experimental study of this topic anoxic / aerobic membrane bioreactor (A / O-MBR) and reverse osmosis (RO) combined process coupled treatment of landfill leachate analog leachate wastewater and landfill leachate. A / O-MBR system, the first effects of different influent COD / N ratio condition, COD and NH , 4 -N removal effect, and explore nitrogen removal pathway; Second, examine the A / O-MBR system on actual landfill leachate COD and NH 4 -N removal effect. Application RO process follow-up of A / O-MBR membrane water treatment, to examine the treatment effect and membrane fouling. The specific results of the study are summarized as follows: (1) in the A / O-MBR system, different influent COD / N ratio of COD removal rate is not the COD average removal rate of 95.6%. However, different influent COD / N is larger than the TN removal affect COD / N averages of 7.1 and 5.6, total nitrogen removal by anoxic denitrification traditional aerobic nitrification and simultaneous nitrification and denitrification to complete, the the TN average removal rate of 72% and 74%, respectively; COD / N average of 10.2, the TN removal by simultaneous nitrification and denitrification, the average removal rate of 89.4%. (2) A / O-MBR treatment of landfill leachate, 4,2,1 three different dilution factor, COD removal were 79.6%, 87.5%, 81.42%; the NH 4 -N removal rates were 97.6%, 95.8%, 89%; TN removal rate of 23%, 39%, 51.3%, respectively. During the experiment, the anoxic zone and aerobic zone of nitrate, nitrite and ammonia difference between the difference is small. (3) A / O-MBR / RO treatment of simulated wastewater effluent quality can be achieved in water reuse standards, and the system is running stable, reverse osmosis, even at low temperature (13-14 ℃) and high ion concentration (4000 us / cm ) conditions, TOC, TN, conductivity removal rate remained at 93.2%, 89%, 92.9%. A / O-MBR / RO treatment of landfill leachate, under the same operating conditions (0.45MPa), reverse osmosis average removal rate of TOC, TN 96.3%, 90%. (4) reverse osmosis membrane treatment of simulated wastewater inlet contamination is more serious than at the outlet, reverse osmosis membrane was investigated by chemical analysis and FTIR pollutants. The results show that the reverse osmosis membrane-fouling substances are mainly the A / O-MBR out the water contained in the SMP, whose main component is a polysaccharide and protein. Reverse osmosis membrane fouling landfill leachate treatment, after the determination of reverse osmosis and out of the water the DOM, the results show that the reverse osmosis membrane HiA strong permeability and strong rejection of HoN.
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