Date of Award

Fall 2000

Document Type


Degree Name

Master of Science in Environmental Engineering - (M.S.)


Civil and Environmental Engineering

First Advisor

Sudhi Mukherjee

Second Advisor

Hsin Neng Hsieh

Third Advisor

Methi Wecharatana


Operating parameters for sequencing batch reactor have the influenceon each substrate concentration. Concentration profile changes as operationparameters are changed. The study was conducted to model the variationin effluent concentration from sequencing batch reactor. MLVSS and cycletime 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 concentrationprofile. The increase of MLVSS can lower the concentration of BOD andammonium concentration in React period. Increasing MLVSS can show thatmore substrate utilization and nitrification process occur more rapidly.Concentration of nitrate at the end of settle period varies with theMLVSS concentration in the system. Cycle time is another parameter thatshows the effect on concentration profiles. The increasing of reacttime provides more time for biomass to react and makes the BOD effluentand ammonium concentration decrease. Settle period, which is anoxic,makes the system in denitrification environment influences on nitrateremoval. When settle period decreases, nitrate has less time to transformto nitrogen gas.