BAC-PROCESS IN BIOLOGICAL POWDERED ACTIVATED CARBON - MICROFILTRATION FOR TREATING MICRO-POLLUTED WATER SOURCE

摘要

The performance of BPAC-MF system and the process of biological activated carbon (BAC) were studied for treating micro-polluted water aerobically. The wastewater was from Guanting Reservoir in Beijing, and HRT(Hydraulic Residual Time) of the system was set at 1.5h. The results showed that the BPAC-MF system could start up quickly by the adsorption of BPAC before biofilm was established in the system. When the adsorption capacity of PAC declined, the biofilm established in the system could take an important role in removing pollutants. The combined function of microorganisms and PAC (Powdered Activated Carbon) made the system maintain a high removal of organic substances. The average removal efficiency of organic matters characterized with COD_(Mn), UV_(254) and UV_(410) for the system was 68.42%, 75.61% and 87.50%, respectively, at the temperature lower than 10℃. The system demonstrated strong advantages to operate at low temperature. The measurement of AOC showed that the removal efficiency of AOC(Assimilable Organic Carbon) was 60.22% and the effluent water could meet the desired criterion of 100 μg acetate-C/L for biologically stable water. The mechanism of BPAC-MF system was investigated through measuring he apparent molecular size distribution (AMSD) of organic compounds. The performance of BPAC-MF system depended on the joint functions of BPAC biodegradation and membrane separation. In addition, the biodegradation kinetics of BPAC was also studied.