[Characters of fuzzy control parameters pH and ORP of denitrification in SBR process]

In order to achieve fuzzy control of denitrification in Sequencing Batch Reactor, the effects of beer wastewater, sodium acetate, methanol and endogenous carbon source on the relationships between pH, ORP and denitrification were studied. Different amount of beer wastewater and two different methods of dose were examined. All the results indicated that ORP decreased quickly and then slowly, when denitrification stopped ORP decreased quickly, showing a breakpoint on the ORP curve; pH increased till denitrification stopped, then decreased, showing a turning point. When carbon was the limiting factor, through comparing the increasing rate of pH, whether the carbon was enough or not could be known and when the carbon should be added again could be decided.