The performance of SBRs treating two kinds of wastewater(synthetic wastewater con-taining polyvinyl alcohol and effluent from a coke-plant wastewater treatment system)was investi-gated in this study,in order to examine the exact function of anaerobic portion in a conventionalSBR.The set up of 4-or 8-hour anaerobic mixing period in a SBR’s cycle did not benefit for PVAdegradation.While an anaerobic reactor seeded with anaerobic sludge could partly hydrolyse andacidify PVA into readily-degradable intermediates.During the anaerobic fill period of an SBR treat-ing the effluent from a coke-plant wastewater treatment system,the organic concentration was re-duced to certain extent due to the adsorption of activated sludge and dilution of the mixed liquorfrom the previous cycle.Parts of readily-degradable organics in the influent were utilised by denitri-fiers as carbon source.The biomass in a conventional SBR was alternatively imposed to aerobic andanaerobic conditions in its operating cycle,the environmental conditions needed for anaerobic hy-drolization and acidification of refractory organics could not occur in such an SBR.
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