EFFECTS OF ADDITION OF FERRIC HYDROXIDE OR POWERED ACTIVATED CARBON ON SEQUENCING BATCH REACTORS TREATING COKE-PLANT WASTE-WATER

The performance of three sequencing batch reactors (SBRs) treating the effluent from a conventional coke-plant wastewater biological treatme nt system was evaluated in this study. The addition of powered activat ed carbon (PAC) to an SBR had a significant effect on chemical oxygen demand (GOD) removal from the coke-plant wastewater, but the addition of ferric hydroxide appeared to have little influence on COD reduction . The conventional SBR, PAC-SEP and bioferric-SER performed similarly in terms of nitrification and sludge settling property. The PAC did no t seem to enhance the biodegradation capacity of the activated sludge in the SBR and probably mainly acted as an adsorbent in the PAC-SEP.