Study On Wastewater Treatment By Contact Oxidation-Membrane Bioreactor

The Contact oxidation-membrane bioreactor technology combines the traditional treatment methods and membrane bioreactor (MBR). For the many inadequacies of submerged membrane bioreactor engineering in operation, particularly for the domestic module problems in the application (such as membrane pollution control, the optimization of the membrane bioreactor process and operating conditions, sludge high yield), the traditional process and the method of combining MBR process, and study the new MBR combined process, and its engineering practice and provide a theoretical basis. In this paper, using the MF domestic module deal with the small municipal wastewater test as an example of its long-run effect, the status of factors, pollution characteristics, energy distribution, and several other areas were studied.Firstly, based on 148 days multistage pilot, The Contact oxidation-membrane bioreactor technology to treat the municipal wastewater and the high concentration of organic wastewater was studied, and understanding the effect of the biofilm and the MBR in the respective paragraph. The results showed the biofilm assumed most of the organic wastewater load, and MBR of the low organic load, especially in the regular load (COD = 500mg/L), the MBR sludge concentration of growth slow the sludge in the reactor, long-term operation of the activity decreased, microbial decomposition of a great number of their own SMP, the effect of causing adverse effects.Secondly, when the concentration of effluent COD was over 100 mg/L in the biofilm, ammonia treatment efficient was very poor. According to common attachment biofilm theoretical model at home and abroad, the reasons was explained. Multi-species modeling results show because of space and dissolved oxygen of competition, when the organic substrate concentration is over 27 mg/L, Nitrobacteria can't survive in the inside of biofilm. According to microbial growth theory, the paper explained relations the ammonia nitrogen removal with the COD and the dissolved oxygen in the biofilm.Thirdly, when the operating conditions unchanged in MBR, the sludge growth is a dynamic process in reactor, so the sludge characteristics also have the dynamic change. By the long period of trial operation, The activity change of the sludge was researched. At the same time, in accordance with the activity sludge changed in the reactor, as well as the reactor generated different quantity of SMP(soluble microbial product), the paper researched the change of the hollow fiber membrane filtration characteristics. At last, in the long-term operation of the trial, the change of the microbial populations have affected to the effect of the experimental. As the experimental processed and the conditions changed, the edge species are also to change in the reactor. The edge species have different effect to the pilot operation. Through the observation, The edge species under different conditions as well as its effect to the experital was studied in the pilot.