Cometabolic biodegradation of 4-chlorophenol by sequencing batch reactors at different temperatures

Comparison of experimental methods for determination of toxicity and biodegradability of xenobiotic compounds

“…Some chemical and photochemical treatments have shown a high efficiency for the removal of both, chlorophenols (Calvo et al 2004(Calvo et al , 2006Diaz et al 2008) and pesticides (Hincapie et al 2006;Maldonado et al 2006;Calvo et al 2008), but presumably at a high cost. Therefore, despite the recalcitrant nature of these compounds, research efforts are being addressed on the potential application of biological processes, like using acclimated biomass bioreactors (González et al 2006;Celis et al 2008, Monsalvo et al 2009) or bioaugmentation (Smejkal et al 2003).…”

Comparison of bioaugmented EGSB and GAC–FBB reactors and their combination with aerobic SBR for the abatement of chlorophenols

“…SBR was supplemented with nutrients (COD:N:P = 100:0.5:0.1) and operated at different HRT for the sake of learning on the potential coupling of anaerobic and aerobic treatment. The ability of the mixed bacterial cultures for using chlorophenols as carbon and energy sources is associated to the selection and enrichment in SBR of specialized populations present in the consortium [13]. As can be seen in Fig.…”

“…) was reached at an HRT of 80 h. Previous works have reported that the addition of cosubstrates and the use of operation strategies based on time control can increase the specific degradation rate up to 15.8 and 22.5 mg 4CP g À1 SSV h À1 , respectively [13,14]. At 10 h HRT a concentration of 750 lM of 4CP was reached after filling, which caused the destabilization of the system (data not shown).…”

“…Despite the recalcitrant nature of MCPs, some efforts have been addressed towards the use of aerobic biological processes [13]. Among the different biological systems used for the breakdown of MCPs, sequencing batch reactors (SBR) have important advantages such as reduced space, easy control, nutrients removal and low energy requirements.…”

Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor

“…This PNP-degrading sludge was mainly composed of Acinetobacter and Arthrobacter bacteria [10] and can biodegrade mixtures of dihydroxybenzenes [8]. Aerobic biological processes have also been reported to remove cresols [7,11] and chlorophenols [12,13]. Recently, Nielsen and Ingvorsen [14] demonstrated that a strain of Citricoccus, capable of effectively degrading PNP, was also able to degrade (and grow on) p-3 chlorophenol and phenol, but not on o-nitrophenol, m-nitrophenol or o-chlorophenol.…”