PSO-BASED PARAMETRIC ANALYSIS OF SLOWLY BIODEGRADABLE COD KINETICS

摘要

This paper considers the degradation kinetics of activated sludge models (ASM2), and in particular the vital components of slowly biodegradable chemical oxygen demand (SBCOD, XS). In terms of micro-organic growth and metabolism, knowledge on the degradation kinetics process of XS is necessary for optimization of the control measures for wastewater treatment plants (WWTPs). Using a particle-swarm optimization (PSO) algorithm, an analytic methodology was developed for two parameters— the half-saturation constant (KX) in the XS-component degradation kinetics and the hydrolysis rate (kh). This methodology was applied to samples taken from a WWTP in Chongqing (China). The organic aerobic degradation was measured using a previously developed hybrid respirometer. The analytic results demonstrate that, under a similar external environment, the method gives parameter values different to the defaults used in the ASM2. This will enable a practical response to the problems of optimizing and controlling WWTP.