Comparative granule characteristics and biokinetics of sucrose-fed and phenol-fed UASB reactors.
Two upflow anaerobic sludge bed (UASB) reactors were fed with a non-inhibitory substrate sucrose and an inhibitory substrate phenol, respectively, to compare granule characteristics and biokinetics. The average size of biomass granules in the sucrose-fed UASB reactor was slightly larger than that of the phenol-fed reactor. The average microbial density was significantly higher in the phenol-fed reactor. The intrinsic biokinetics of sucrose-acidogenesis and phenol-acidogenesis followed Monod and Haldane kinetics, respectively. By comparing half-saturation constants for sucrose and phenol (Ks1,s; Ks1,p), the affinity of phenol to the granule should be much higher. The mass fraction of methanogens (f) in the sucrose-fed reactor decreased with increasing volumetric loading rate (VLR) because of the accumulation of volatile fatty acids (VFAs); the f of the phenol-fed reactor decreased with increasing VLR because acidogenesis was the rate-limiting step. The mass transfer resistance in overall substrate removal in the sucrose-fed reactor was greater than that in the phenol-fed reactor.
Chou
H H
HH
Department of Environmental Engineering, National Cheng Kung University, 1 University Road, Tainan City 70101, Taiwan, ROC.
Huang
J S
JS
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors; D002849:Chromatography, Gas; D007700:Kinetics; D010316:Particle Size; D019800:Phenol / Q000378:metabolism; D013395:Sucrose / Q000378:metabolism; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D019800:Phenol; D013395:Sucrose