Characterization and modelling of coimmobilized aerobic/anaerobic mixed cultures

Low-Strength Wastewater Treatment with Combined Granular Anaerobic and Suspended Aerobic Cultures in Upflow Sludge Blanket Reactors

“…The survival of anaerobic cultures under aerobic or microaerobic ͓dissolved oxygen ͑DO͒ concentration Ͻ1 mg/ L, Yerushalmi et al 2001͔ conditions is attributed to either intrinsic tolerance or formation of anaerobic niches ͑shielding effect͒ in these studies. Considering the location of the cultures in the reactor, studies can be classified as follows: ͑1͒ both anaerobic and aerobic species co-immobilized in natural polymers operating under aerobic and/or microaerobic conditions ͑Beunink and Rehm 1988Rehm , 1990; Kurosawa and Tanaka 1990;Meyerhoff et al 1997͒; ͑2͒ granular anaerobic cultures or anaerobic cultures embedded into supportive media and suspended aerobic cultures placed in a reactor operating under aerobic/microaerobic conditions ͑Gerritse and Gottschal 1992; Gardin et al 2001͒; ͑3͒ suspended anaerobic and aerobic cultures in the reactor operating under microaerobic/ oxygen-limited conditions ͑Gerritse et al 1990; Zitomer and Shrout 1998͒; and ͑4͒ mixed suspended anaerobic ͑or anoxic͒ and aerobic cultures in packed-bed bioreactors ͑Hutchins et al 1992; Boopathy et al 1998;Yerushalmi et al 1999͒. In some of these studies with either free or co-immobilized cultures of anaerobes ͑or anoxic cultures͒ and aerobes, it is observed that DO concentrations display alternating values.…”

Evaluation of effective diffusion coefficient and intrinsic kinetic parameters on azo dye biodegradation using PVA‐immobilized cell beads

“…Thus, the intrinsic kinetics of supernatant cells, or the apparent or inherent kinetics of immobilized cells/enzymes, rather than the intrinsic kinetic parameters of immobilized cells is often used to analyze the kinetic behavior of immobilized cell beads (Lefebvre and Vincent, 1995;Meyerhoff et al, 1997;Bandhyopadhyay et al, 2001;Faqir and Attarakih, 2002). Meyerhoff et al (1997) examined the characterization and modeling of immobilized mixed cultures using intrinsic kinetic parameters of supernatant cells. Bandhyopadhyay et al (2001) reported that phenol was biodegraded by Pseudomonas putida immobilized in a calcium alginate matrix.…”

Engineering bacterial processes for cellulosic ethanol production

“…Recently, a coculture process involving immobilized Z. mobilis and free Pichia stipitis resulted in complete biomass conversion and high ethanol yields (0.49 g/g) from sugarcane bagasse hydrolysate [150]. The performance of mixed cultures of Z. mobilis and the fungus Aspergillus awamori coimmobilized in Ca-alginate beads in stirred tank and airlift tower loop bioreactors was investigated for conversion of starch to ethanol [151]. In the same study, a mathematical model was developed to study mass transfer properties and to optimize process conditions for ethanol production.…”