Abstract
Biokinetic parameters help to describe the rate of substrate utilization and biomass production or growth by microbial action, which is important to the design process and performance optimization of wastewater treatment. Although studies of the biokinetic parameters of aerobic granular sludge (AGS) systems have been increasing lately, the significance for each value in terms of maximum specific growth rate (μ<sub>max</sub>), substrate concentration at one-half of the maximum specific growth rate (K<sub>S</sub>), and cell yield (Y) in relation to the applied operating conditions are rarely discussed. Therefore, this study investigates the relationship and significance between the above-stated biokinetic parameters with organic loading rate (OLR) and reactor height/diameter (H/D) ratio from five different batches of AGS treated sewage, using the independent t-test. The biokinetic parameters are summarized as biomass production (<i>Y</i> and <i>μmax</i>) and relied upon the relative increase in the OLR and reactor H/D ratios. Additionally, aerobic granules developed in reactors with a high H/D ratio have a shorter setup time and are more active in contrast with low H/D ratio reactors.
Highlights
Biokinetic coefficients are the basis for wastewater treatment plant (WWTP) design [1]
There are several studies of biokinetic coefficient determination in different processes that have focused on the kinetics of crossflow membrane bioreactor processes (CF-MBR) in the treatment of refinery wastewater [2]
Most of the previous studies reporting biokinetic coefficients are based on a WWTP design of CF-MBR, Up-flow, or an activated sludge process [7]
Summary
Biokinetic coefficients are the basis for wastewater treatment plant (WWTP) design [1]. A study by Mardani et al [3] determined the biokinetic coefficients for activated sludge processes such as conventional, extended aeration, and contact stabilization on municipal wastewater. A study by Okpokwasili and Nweke [4] determined the biokinetic parameters in municipal wastewater treatment with a submerged MBR using the Monod equation. Their results showed that the Y, kd , KS , and μmax coefficients were in the range of the Monod equation [5]. The significance of biokinetic parameters including μmax, KS, and Y will be discussed to determine the relationship between changes in the kinetic coefficients with organic loading rate (OLR) and reactor height/diameter (H/D) ratio, taken from five different batches of aerobic granules
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