Biochemical Treatment Of Coking Wastewater

It mainly studied the disposal of coke plant wastewater using highly-effective degrading bacteria.Aiming at coke plant wastewater from Ma'anshan coke plant , 4 kinds of Highly-effective Degrading Bacteria(H1, H2, Y1, Y2) were trained, acclimated, separated and initial indentificated.Growth curves of individual aerobic bacteria , individual anaerobic bacteria , mixed aerobic bacteria and mixed anaerobic bacteria were determined, and the bste growing conditions of them were measured. The bste growing condition of mixed aerobic bacteria was: glucose 20 g·L^-1,rotational speed 125 rmin^-1,temperature 30°C, pH 7.0; the bste growing condition of mixed anaerobic bacteria was: glucose 20 g·L^-1,temperature 30°C,pH 7.0.In the experiment, it compared the degradation results of the mixed highly-effective degrading bacteria with individual ones and other kinds of bacteria conserved by the lab. The conclusion was that the mixed highly-effective degrading bacteria was more efficient to degrade the coke plant wastewater. The elimination ratio of COD and NH3-N of mixed aerobic bacteria reached 84.68%, 85.20%, and the elimination ratio of COD and NH3-N of mixed anaerobic bacteria reached 57.09%, 79.76 %.Combining methods of magnesium ammonium phosphate(MAP) and Fe-C ,coke plant wastewater was also be degraded by the mixed highly-effective degrading bacteria. It was found that MAP was more efficient to remove the NH3-N in coke plant wastewater than Fe-C. It could gain the preferable effect by 'MAP- anaerobic- aerobic' to dispose the coke plant wastewater, and the elimination ratio of COD,NH₃-N were 96.20% , 97.79 %. After the treatment ,COD and NH3-N descended from 3200.65 mg·L^-1, 121.640 mg·L^-1 to 121.58 mg·L^-1 2.683 mg·L^-1 respectively ,which have reached secondary national wastewater discharge standard.