Abstract
An anoxic-aerobic high concentration activated sludge process imbued with a highly effective nitrification and denitrification performance was investigated. The novel and unique feature of this process is unlike other methods of nitrogen removal process, the wastewater influent is introduced into an anoxic tank, wherefrom, the treated effluent is likewise withdrawn.
A kinetic analysis was performed on the data obtained from the bench-scale experiments conducted on synthetic domestic wastewater, synthetic night soil and synthetic PVA wastewater, and summarily, our deductions are as follows;
1) This process could remove not only TCO and Total-N but also recalcitrant polyvinyl alcohol (PV A) substance.
2) We obtained various kinetic formulae for this nitrogen removal process and established the determiation methods for the kinetic constants.
3) The reaction in an aerobic tank follows a 1st order kinetics while the reaction in an anoxic tank follows a zero order kinetics.
4) We established the calculation formulae for an appropriate aerobic tank volume, appropriate anoxic tank volume and appropriate sludge recycle flow rate which are important variables for the design and operation of this process.
