The effect of hydraulic retention time on granular sludge biomass in treating textile wastewater

Effect of reactor height/diameter ratio and organic loading rate on formation of aerobic granular sludge in sewage treatment

“…Comparing the data in Table 5 with the results in Table 4, the values of K d in this study are normally within the reported range of conventional activated sludge (Metcalf and Eddy et al, 2003) and SBR-AGS system (Chen et al, 2008;Liu et al, 2005a;Muda et al, …”

“…The bioactivity of aerobic granules has often been quantified based on specific oxygen uptake rate (SOUR) and biokinetic parameters. Biokinetic parameters aid in describing the rate of substrate utilization and biomass production, or growth by microbial (Muda et al, 2011), which are important to process the design and optimization of system performance (Chen et al, 2008). The biological treatment system design from biokinetic parameters is expected to be superior over other empirical methods that concern fewer empirical factors (Kaewsuk et al, 2010).…”

“…However, there exist only a few reports that consider the bioactivity of aerobic granules in treating real wastewater, especially in the case of sewage. Chen et al (2008), Liu and Tay (2007) and Muda et al (2011) mainly focus on the determination of endogenous decay coefficient (K d ), synthesis yield coefficient (Y) and maximum specific microbial growth rate (m max ) for aerobic granules that develop in synthetic wastewater, directly from equations, and not from a linear plot. Meanwhile, Asadi et al (2014), Kaewsuk et al (2010) and Mizzouri and Shaaban (2013) provide details for the determination of biokinetic parameters using a linear plot for the biodegradation of real wastewater in reactors other than a sequencing batch reactor (SBR).…”

Effect of hydraulic retention time on performance of an anoxic–aerobic sequencing batch reactor treating saline wastewater

“…Durai et al (2011) investigated the effect of HRT on the performance of SBR treating tannery wastewater by salt-tolerant bacterial strains, and they found that the COD removal efficiency significantly decreased with the decrease in HRT from 3 to 2 days. Muda et al (2011) investigated the physical characteristics, microbial activities of the granular sludge from a SBR treating the synthetic textile wastewater under different HRTs, and they found that the HRT increase caused a decrease in biomass concentration, specific biomass growth rate, endogenous decay rate, and biomass yield. Zhang et al (2006) evaluated the effects of HRT on the mixed anaerobic microbial community grown with glucose in a continuous stirred tank reactor.…”

Operation mode and external carbon dose as determining factors in elemental composition and morphology of aerobic granules

“…It has been shown that the selection of operational parameters such as hydraulic retention time (HRT), temperature, a COD/N ratio of the infl uent and organics loading (Cydzik-Kwiatkowska and Wojnowska--Baryła 2011, Ebrahimi et al 2010, Muda et al 2011) affects the morphology of granules and their species composition. The variations of Ca, Mg and K concentrations in the infl uent dictate the amounts of these ions in granules (Schönborn et al 2001).…”