Operating parameters for sequencing batch reactor have the influence on each substrate concentration. Concentration profile changes as operation parameters are changed. The study was conducted to model the variation in effluent concentration from sequencing batch reactor. MLVSS and cycle time are the parameters that were varied. Concentration in Fill, React, and Settle Period were calculated by using kinetic equations.

The results can show that these parameters have effects on the concentration profile. The increase of MLVSS can lower the concentration of BOD and ammonium concentration in React period. Increasing MLVSS can show that more substrate utilization and nitrification process occur more rapidly. Concentration of nitrate at the end of settle period varies with the MLVSS concentration in the system. Cycle time is another parameter that shows the effect on concentration profiles. The increasing of react time provides more time for biomass to react and makes the BOD effluent and ammonium concentration decrease. Settle period, which is anoxic, makes the system in denitrification environment influences on nitrate removal. When settle period decreases, nitrate has less time to transform to nitrogen gas.