The feasible sequential control strategy of treating high strength organicnitrogen wastewater with sequencing batch biofilm reactor

The bio-kinetics and feasible sequential control strategy of treating high strength organic carbon and nitrogen wastewater were investigated by conduc ting the ABS manufacturing wastewater in a series of Sequencing Batch Biofi lm Reactors (SBBRs). The on-line ORP, pH, and DO monitoring parameters were applied to identify the feature-points when ammonification, nitrification, and denitrification ends. The carbonaceous matter removal kinetics in the anaerobic and aerobic reaction stages can be expressed by the Michaelis-Men ten equation. High efficiency of organic carbon removal and organic nitroge n ammonification in the anaerobic stage can eliminate the substrate competi tion and activation inhibition to nitrifying organisms in the following aer obic stage. In the sequencing nitrogen removal processes, the producing tim e and system ORP values of these feature-points have good function relation ships with the influent COD loading rates of SBBR, which can be integrated into a set-point (set-time and set-ORP) sequential control strategy of nitr ogen removal. The automatic control operation results revealed ORP was one of the major control parameters of the sequencing nitrogen removal process in SBBR system and high overall removal efficiency were obtained.