Performance of a fed-batch reactor treating a wastewater containing 4-chlorophenol

Bali, Ulusoy; Şengül, Füsun

doi:10.1016/s0032-9592(02)00022-5

Cited by 69 publications

(64 citation statements)

References 10 publications

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“…Therefore, the detrimental effects of substrate inhibition on CP degradation are avoided. These results agree with those of Bali and Sengül (2002), who concluded that the feeding strategy is a key factor for complete removal of both growth and non-growth substrates in fed-batch operation with no acclimated bacteria.…”

Section: Resultssupporting

confidence: 92%

“…Field and Sierra-Alvarez (2008) have summarised a wide spectrum of strains of bacteria and fungi which are capable of using CP as the sole carbon and energy source. While most researchers have studied biological treatment in batch reactors, several authors have proposed alternate configurations to improve the industrial application of CP degradation (Mun et al, 2008), including fed-batch reactor systems (Bali and Sengül, 2002;De Los Cobos-Vasconcelos et al, 2006). The fed-batch system allows for the treatment of larger quantities of wastewater than the batch system, with the same amount of initial inoculum (Blanch and Clark, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…In this way, high concentrations of organic and toxic compounds are diluted in a large reaction volume, thus reducing inhibitory/toxic effects. As a result, biological oxidation of these compounds usually takes place at a higher rate (Bali and Sengül, 2002).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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“…In such a case, the co-metabolic enzymes required for the transformation of refractory compounds are induced. The energy quickly regenerates with the rapid metabolism of glucose, which, in turn, can be used to transform refractory compounds (Bali and Sengül, 2002;Wang et al, 2007). However, in this study, the addition of glucose to the aerobic phase only provided a carbon source for the growth and metabolism of the heterotrophs.…”

Section: Effect Of Glucose Addition To the Different Sections Of The mentioning

confidence: 89%

The stimulating effects of the addition of glucose on denitrification and removal of recalcitrant organic compounds

Wang

2014

Braz. J. Chem. Eng.

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-A laboratory scale aerobic oxidation ditch combined with an anoxic reactor was conducted to treat wastewater from a chemical industrial park in Tianjin, China. The wastewater exhibited a low biodegradability, and the results of gas chromatography mass spectrometry (GC-MS) analysis showed that some recalcitrant organic components are present in the wastewater. Ammonia nitrogen (NH 4 + -N) removal efficiency of over 90% was obtained. However, the removal efficiencies of total nitrogen (TN) and chemical oxygen demand (COD) were below 16% and 15%, respectively. The addition of glucose to the anoxic reactor in the system increased the removal efficiencies of TN and COD to approximately 72% and 25.57%, respectively. Results of mass balance indicate that about 60% of the external carbon was consumed as electron donor for denitrification, while 40% was consumed as a substrate for co-metabolism. The optimal dose of added glucose was also investigated, which was determined at 0.35 to 1.20 (COD glucose :COD original ).

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“…The most obvious difficulty for indigenous microbial populations, such as activated sludge, when first exposed to a xenobiotic compound, is the lacking of specific metabolism pathways that are required to break down the stable molecular structures of xenobiotics. Acclimating activated sludge to the target xenobiotic is a feasible method for indigenous sludge to evolve the necessary biochemical functions and thereby develops a capability of sufficient strength for xenobiotics degradation (Bali and Şengül 2002;Sahinkaya and Dilek 2002). Yet, growth yield on the sole xenobiotic substrate is usually low.…”

Section: Introductionmentioning

confidence: 99%

Conditions for supplemental biogenic substrates to enhance activated sludge degradation of xenobiotic

Nguyen

Chong

2015

Appl Microbiol Biotechnol

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The effects of biogenic presence on the degradation of xenobiotic organics by natural microbial populations have been reported as either advantageous or disadvantageous. The inconsistency of the reports implies there could be a turning point from disadvantageous to advantageous outcomes so that conditions may exist that could bring an optimum advantage. This study tested the supplementations of varying concentrations of sucrose and peptone, separately and combined, to acclimated activated sludge degradation of xenobiotic 2,4-D, while other operational and microbiological conditions were held constant. Our test results showed that biogenic may indeed enhance or slow down xenobiotic degradation rates. The highest enhancements exist at concentrations of 50 and 80 mg/L, respectively, for sucrose and peptone when supplemented separately, and 20 mg/L sucrose and 40 mg/L peptone combined. Conditions for advantageous biogenic supplementation were identified for activated sludge degradation of a xenobiotic; specifically, the highest degradation rate enhancements occurred when biogenic supplementation was approximately 0.5 to 0.7 the concentration of 2,4-D base on chemical oxygen demand (COD), which brought a biomass yield of approximately double that yielded by 2,4-D. Kinetics analyses provided clues for the possible causes of advantageous and disadvantageous effects due to biogenic supplementation.

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Performance of a fed-batch reactor treating a wastewater containing 4-chlorophenol

Cited by 69 publications

References 10 publications

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

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

The stimulating effects of the addition of glucose on denitrification and removal of recalcitrant organic compounds

Conditions for supplemental biogenic substrates to enhance activated sludge degradation of xenobiotic

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