Biodegradation kinetics of 1,4-benzoquinone in batch and continuous systems

Abstract

Combining chemical and biological treatments is a potentially economic approach to remove high concentration of recalcitrant compounds from wastewaters. In the present study, the biodegradation of 1,4-benzoquinone, an intermediate compound formed during phenol oxidation by chlorine dioxide, was investigated using Pseudomonas putida (ATCC 17484) in batch and continuous bioreactors. Batch experiments were conducted to determine the effects of 1,4-benzoquinone concentration and temperature on the microbial activity and biodegradation kinetics. Using the generated data, the maximum specific growth rate and biodegradation rate were determined as 0.94 h(-1) and 6.71 mg of 1,4-benzoquinone l(-1) h(-1). Biodegradation in a continuous bioreactor indicated a linear relationship between substrate loading and biodegradation rates prior to wash out of the cells, with a maximum biodegradation rate of 246 mg l(-1) h(-1) observed at a loading rate of 275 mg l(-1) h(-1) (residence time: 1.82 h). Biokinetic parameters were also determined using the steady state substrate and biomass concentrations at various dilution rates and compared to those obtained in batch cultures.

Kinetics and mechanism for the oxidation of anilines by ClO2: a combined experimental and computational study

“…An attempt to characterize this product using IR spectroscopy indicates the presence of a C=O group. Benzoquinones are intermediate products of the oxidation of aromatic anilines and can further be oxidized to maleic acid, oxalic acid, and other small molecules as end products; in addition, the complete biodegradation of benzoquinone is also reported . Benzoquinones are present in nature in various forms such as ubiquinones, blattellaquinone, and hydroquinones .…”

“…Benzoquinones are intermediate products of the oxidation of aromatic anilines and can further be oxidized to maleic acid, oxalic acid, and other small molecules as end products; in addition, the complete biodegradation of benzoquinone is also reported. [51] Benzoquinones are present in nature in various forms such as ubiquinones, blattellaquinone, and hydroquinones. [52] It is also reported that 1,4-benzoquinone and its derivates can be removed from the environment via biological processes such as upflow anaerobic sludge bed, expanded granular sludge bed and submerged anaerobic membrane bioreactor (SAMBR), and they also act as mediators (reducing agent) in the redox reactions.…”

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

“…where fn is TKN/VSS (total Kjeldahl nitrogen/volatile suspended solids) ratio of the activated sludge (mg N/mg VSS), fEH is the unbiodegradable fraction of heterotrophic microorganisms in endogenous solutions. However, the persistence of the hydroquinone-benzoquinone equilibrium at long irradiation times probably continues to confer some toxicity to the aqueous system [34], as evidenced by the fact that the BOD/COD ratio remains at approximately 0.8 even at long irradiation times regardless of the type of chlorophenol. Based on the results shown above regarding the intermediates formed during the photocatalytic oxidation of 4-chlorophenol and 2,4-dichlorophenol, speculative degradation mechanisms have been proposed for each chlorophenol (Figures 7 and 8).…”

Comparative meta-analysis and experimental kinetic investigation of column and batch bottle microcosm treatability studies informing in situ groundwater remedial design

“…In studies where the contaminant is chemically or biologically transformed, kinetic data are often presented in the form of rate constants, specifically as first-order rate constants ( k ) and corresponding, concentration-independent half-lives (t 1/2 ) [21–23]. Often, these calculated parameters are directly compared to those of other studies with similar experimental designs, in an effort to further substantiate the feasibility of the tested technology [24–26]. First-order rate constants are often used to populate projection models, which are integral in determining the fate and transport characteristics of the contaminants of interest [27–30].…”