title: Dynamics of polyhydroxyalkanoate accumulation in aerobic granules during the growth-disintegration cycle.
abstract: The polyhydroxyalkanoate (PHA) accumulation dynamics in aerobic granules that undergo the growth-disintegration cycle were investigated. Four sequencing batch reactors (SBR) were inoculated with aerobic granules at different stages of development (different sizes). Different sizes of aerobic granules showed varying PHA contents. Thus, further study was conducted to investigate the diffusion of substrate and oxygen on PHA accumulation using various organic loading rates (OLR) and aeration rates (AR). An increase in OLR from 0.91 to 3.64kg COD/m(3)day increased the PHA content from 0.66 to 0.87g PHA/g CDW. Meanwhile, an AR increase from 1 to 4L/min only accelerated the maximum PHA accumulation without affecting the PHA content. However, the PHA composition only changes with AR, while the hydroxyvalerate (HV) content increased at a higher AR.
authors.affiliation: School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia.
authors.forename: K
authors.initials: K
authors.lastname: Gobi
authors.affiliation: School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia. Electronic address: chvel@usm.my.
authors.forename: V M
authors.initials: VM
authors.lastname: Vadivelu
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors; D054813:Polyhydroxyalkanoates / Q000032:analysis / Q000378:metabolism
chemical_list: D054813:Polyhydroxyalkanoates
keywords: Aeration rate; Aerobic granules; Growth–disintegration cycle; Organic loading rate; Polyhydroxyalkanoate