Biodegradation of 4-chlorophenol by acclimated and unacclimated activated sludge—Evaluation of biokinetic coefficients

Şahinkaya, Erkan; Dilek, Filiz B.

doi:10.1016/j.envres.2004.11.005

Cited by 73 publications

(54 citation statements)

References 25 publications

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“…Particularly, chlorophenols are an important class of aromatic pollutants in industrial wastewaters because of their wide use in the production of preservers, pesticides and biocides (Quan et al 2005). Chlorinated phenols can exist up to 100-200 mg/L in contaminated environments (Sahinkaya and Dilek 2005). However, phenolic compounds are usually poorly degraded in conventional wastewater treatment systems.…”

Section: Introductionmentioning

confidence: 99%

Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type

Aktaş

Çeçen

2007

Adsorption

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This study aims to clarify the effects of carbon activation type and physical form on the extent of adsorption capacity and desorption capacity of a bi-solute mixture of phenol and 2-chlorophenol (2-CP). For this purpose, two different PACs; thermally activated Norit SA4 and chemically activated Norit CA1, and their granular countertypes with similar physical characteristics, thermally activated Norit PKDA and chemically activated Norit CAgran, were used. The thermally activated carbons were better adsorbers for phenol and 2-CP compared with chemically activated carbons, but adsorption was more reversible in the latter case. 2-CP was adsorbed preferentially by each type of activated carbon, but adsorption of phenol was strongly suppressed in the presence of 2-CP. The simplified ideal adsorbed solution (SIAS) model underestimated the 2-CP loadings and overestimated the phenol loadings. However, the improved and modified forms of the SIAS model could better predict the competitive adsorption. The type of carbon activation was decisive in the application of these models. For each activated carbon type, phenol was desorbed more readily in the bi-solute case, but desorption of 2-CP was less compared with single-solute. This was attributed to higher energies of 2-CP adsorption.

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Section: Introductionmentioning

confidence: 99%

Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type

Aktaş

Çeçen

2007

Adsorption

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“…The CPs are highly toxic and usually exhibit substrate inhibition (Kargi et al, 2005;Chen and Lin, 2006;Konya et al, 2007), although the concentration at which the compound starts to inhibit depends strongly on the strain and the acclimation procedure (Moreno- Andrade and Buitrón, 2004;Sahinkaya and Dilek, 2005). For the culture used in this work, under the conditions described above, the onset of inhibition in PCP degradation was observed from 40 to50 mg•ℓ -1 of PCP (data not shown) and the degradation did not take place at initial concentrations above 150 mg•ℓ -1…”

Section: Resultsmentioning

confidence: 99%

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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This work was undertaken to investigate the effect of variations of the feed rate on a fed-batch set-up used to degrade xenobiotics. The mixture of substrates was composed of PCP, 2,4,6 TCP and 2,3,5,6 TeCP (pentachlorophenol, 2,4,6 trichlorophenol and 2,3,5,6 tetrachlorophenol respectively). Two acclimated bacteria isolated from soil were used: Pseudomonas aeruginosa and Achromobacter sp. nov. The different flow rates tested were: I: 0.5 mℓ•min . Our results show that during fed-batch operation the 2,4,6 TCP exhibits an earlier degradation than the other compounds, for all of the flow rates tested. This indicates that in this case the degradation of the most recalcitrant compounds (PCP and 2,3,5,6 TeCP) is benefited by the increase in biomass of bacteria, due to the metabolisation of a less recalcitrant compound (2,4,6 TCP). The defined parameter, specific degradation rate (SDR), was demonstrated to be very useful for comparing the degradation abilities at different flow rates of a fed-batch system. The degradation efficiencies were shown to be higher than 90% for all of the cases and to decrease as the feed rate increases. However, the SDR, a parameter that involves the rate of degradation and the biomass, increases as the flow rate increases. At a feed flow rate of 2 mℓ•min -1 SDR reaches a maximum of 12.476 x 10 -10 mgCP•h -1•CFU -1. Finally, among the feed flows tested, taking into account both the degradation efficiency and the SDR, 2 mℓ•min -1 is the most convenient flow rate for chlorophenol degradation in fed-batch systems. An even higher degradation efficiency (97%) can be achieved by using the feed rate of 2 mℓ•min -1 followed by an additional batch post-treatment of 2 h, with a SDR of 13.136 x 10 -10 mg CP•h -1•CFU -1.

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“…A study has presented that complete removal of 4CP up to 300 mg l -1 was achieved by employing acclimated activated sludge. 10 In the study by Vazquez-Rodriguez et al, no lag phase was found during the biodegradation of phenol by activated sludge acclimated to 700 mg l −1 of phenol. 13 Similar result was reported by Janeczko and Oleszkiewicz that immediate biodegradation of 2-nitrophenol (2NP) without any lag was shown using acclimated activated sludge, whereas a 170 to 230 h lag was observed before the initiation of 2NP removal using unacclimated activated sludge.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown the complete mineralisation of various phenolic compounds using activated sludge obtained from sequencing batch reactor systems. [10][11][12][13] Nonetheless, it was observed that the biodegradation of phenolic compounds was mostly conducted using activated sludge that was acclimated to the target compound beforehand. 2,10,13,14 Acclimated activated sludge consists of microorganisms with adjusted morphological, behavioural, physical or biochemical traits in response to changes in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…9 In comparison with the pure culture, complete mineralisation of phenolic compounds using mixed culture is more practical and efficient. 1,10 Sequencing batch reactor (SBR) system, one of the activated sludge processes, provides a good alternative compared to others due to its effectiveness and operational flexibility. Studies have shown the complete mineralisation of various phenolic compounds using activated sludge obtained from sequencing batch reactor systems.…”

Section: Introductionmentioning

confidence: 99%

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Biodegradation of Phenol by Unacclimated and Phenol-acclimated Activated Sludge: Effects of Operational Factors on Biodegradation Efficiency and Kinetics

Peng¹,

Ling²

2017

JPS

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Biodegradation of 4-chlorophenol by acclimated and unacclimated activated sludge—Evaluation of biokinetic coefficients

Cited by 73 publications

References 25 publications

Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type

Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Biodegradation of Phenol by Unacclimated and Phenol-acclimated Activated Sludge: Effects of Operational Factors on Biodegradation Efficiency and Kinetics

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