| A biological activated carbon membrane reactor (BACMR) was studied for treating micro-polluted water through lab and spot experiments for a process developing of micro-polluted water treatment. And the effects of ultrasonic irradiation at low intensity in BACMR on the enhancement of biological action and membrane pollution control were investigated through parallel experiments. The results showed that the average removal efficiencies were 68.18%, 74.84% and 86.63% when the influent CODMn, UV254 and UV410 varied in the range of 3.96~5.81mg/L, 0.064-0.100cm-1 and 0.001~0.013 cm-1 respectively with the joint functions of PAC adsorption, biodegradation and membrane separation under the HRT of 1.5h. The removal efficiency of CODMn for refractory water in reservoir remained at about 60% even at low temperature condition (<10癈). SS could be removed completely and the AOC capacity of effluent water would meet the desired criterion for biologically stable water by the process. Moreover, the removal rate of NH4+-N was about 61.67%. The membrane flux changed a little in the long period operation. The purifying mechanism was analyzed through the apparent molecular size distribution (AMSD) experiment. Parallel experiments showed that ultrasonic at a power intensity of 0.67 W/L could control membrane pollution to some level. The economic character of the process was also analyzed. In conclusion, the process is feasible to purify micro-polluted water. The time interval for ultrasonic treatment could be set at 24 hours to enhance biological activity through the study of the ultrasonic effect change with time. The experiments with ultrasonic at different power intensities showed that ultrasonic at a power intensity of 0.33W/L could enhance biological activity significantly. The ultrasonic effect was studied through organic load, TTC-DHA and AMSD in the contrast experiments between the reactors with and without ultrasonic.
|
PDF Full Text Request