Study On MABR Degradation Of Organic Compounds And Treatment Of Domestic Wastewater

Membrane aerated biofilm reactor (MABR) is a new type of membrane bioreactors developed by combining membrane technology and biotechnology in recent years,. MABR not only has a high utilization of oxygen and a high oxygen supply capacity for organisms, but also operates with energy-saving. Moreover, it is because of no bubble formation in the aeration process, there are not any volatile organic compounds stripped into the air during MABR wastewater treatment.A novel membrane module and a MABR reactor device were designed in this study. The mechanisms of MABR organic compounds and ammonia nitrogen removal were studied. Further more, MABR sewage treatment was discussed.By Comparative analysis, polypropylene hollow fiber membrane with a thin wall and small diameter were selected and prepared as biofilm supports. A set of small laboratory MABR device was developed. A quick start of MABR system was achieved by circulating the culture solution through the hollow fiber bundle in the reactor and the formation process of the biofilm on the hollow fiber surface was discussed. The effects of operation conditions on the COD removal were investigated by running the MABR system consisting of the synthetic wastewater in which all the major components are controllable. The results indicated that the MABR installation developed in this project showed a rapid remove capacity of COD in wastewater and significant removal in quantity, and a good ability in the removal of ammonia in wastewater. The laws of the MABR conduct COD and ammonia nitrogen removal were revealed by the track test running at different oxygen pressure in the lumen side of hollow fibers. It is pointed out that the appropriate operating conditions are very important for effectively removing ammonia in wastewater.On this basis, the effects of the biofilm domestication, pH, oxygen pressure in hollow fibers, HRT, wastewater recycling rate and temperature on the MABR sewage treatment were mainly investigated. The effluent COD concentration was usually maintained at 30 mg/L below and the sewage SS was effectively reduced to 15 mg/L below even if influent quality varied greatly during the MABR experiments. Meanwhile, ammonia in wastewater was effectively removed. The both studies of the synthetic wastewater MABR treatment and domestic sewage MABR treatment identify that MABR could achieve COD removal and simultaneously ammonia nitrogen nitrification and nitrate nitrogen denitrification in a single reactor at the same time. Compared to conventional wastewater treatment processes, MABR has many advantages, such as high oxygen utilization, energy conservation, high efficiency, multi-functional integration, less sludge, continuous operation, integration and easily controllable and others, and has good prospects.