Combined effects of external mass transfer and biodegradation rates on removal of phenol by immobilized Ralstonia eutropha in a packed bed reactor

Tepe, Özlem; Dursun, Arzu

doi:10.1016/j.jhazmat.2007.05.049

Cited by 92 publications

(43 citation statements)

References 30 publications

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“…Phenolic compounds enter the environment at different concentrations from large number of industries such as petrochemical industry, coal industry, rubber, paper, plastics, and oil refi neries (Tepe andDursun 2008, Bayramoğlu andArıca 2008). In addition, those compounds can be produced by the degradation of chlorinated pesticides into the environment and in the presence of chlorine, which is produced during the burning of organic material (Navarro et al 2008, Sądej et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Majlesi¹,

Hashempour²

2017

Archives of Environmental Protection

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NomenclatureRSM Response surface methodology BBD Box-Behnken factorial design AC Activated carbon NZVI Nano zero-valent iron SEM scanning electron microscope EDS electron dispersion spectrometer XRD x-ray diffraction PEG polyethylene glycol q e the amount of 4-CP adsorbed (mg l Keywords: response surface methodology, 4-chlorophenol, NZVI/AC.- Abstract:The phenolic compounds are known as priority pollutants, even in low concentrations, as a result of their toxicity and non-biodegradability. For this reason, strict standards have been established for them. In addition, chlorophenols are placed in the 38th to 43th in highest priority order of toxic pollutants. As a consequence, contaminated water or wastewaters with phenolic compounds have to be treated before discharging into the receiving water. In this study, Response Surface Methodology (RSM) has been used in order to optimize the effect of main operational variables responsible for the higher 4-chlorophenol removal by Activated Carbon-Supported Nanoscale Zero Valent Iron (AC/NZVI). A Box-Behnken factorial Design (BBD) with three levels was applied to optimize the initial concentration, time, pH, and adsorbent dose. The characterization of adsorbents was conducted by using SEM-EDS and XRD analyses. Furthermore, the adsorption isotherm and kinetics of 4-chlorophenol on AC and AC/NZVI under various conditions were studied. The model anticipated 100% removal effi ciency for AC/NZVI at the optimum concentration (5.48 mg 4-chlorophenol/L), pH (5.44), contact time (44.7 min) and dose (0.65g/L). Analysis of the response surface quadratic model signifi ed that the experiments are accurate and the model is highly signifi cant. Moreover, the synthetic adsorbent is highly effi cient in removing of 4-chlorophenol.

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Section: Introductionmentioning

confidence: 99%

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Majlesi¹,

Hashempour²

2017

Archives of Environmental Protection

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“…Although cell immobilization by entrapment ofers signiicant advantages, it is problematic in terms of difusion limitation owing to the resistance imposed by the protective structure [42]. Also, in the design and modeling of bioreactors, it is equally important to assess external mass transfer coeicients for the transfer of substrate from the bulk phase to the surface of the bioilm.…”

Section: Biodegradation Kinetics and Modelingmentioning

confidence: 99%

“…Therefore, kinetic models for degradation in bioilm reactors are complex and diicult to develop. Several studies addressed this topic and proposed comprehensive difusion-reaction models, which account for mass transfer limitations [42,43].…”

Section: Biodegradation Kinetics and Modelingmentioning

confidence: 99%

Organic Contaminants in Refinery Wastewater: Characterization and Novel Approaches for Biotreatment

Al-Khalid¹,

El‐Naas²

2018

Recent Insights in Petroleum Science and Engineering

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Addressing major environmental issues, such as water pollution, is essential nowadays in realizing sustainable development. The ever-increasing world population and industrial development have led to the introduction of diferent types of chemicals to the environment, leading to considerable deterioration in environmental quality. A major class of these chemicals is phenolic compounds, which are hazardous pollutants and highly toxic even at low concentrations. In recent years, researchers have realized the importance of extracting new bacterial strains that are efective in treating diferent types of highly contaminated wastewaters at diferent severe conditions. They also focused considerable amount of research on developing new types of reactors that would provide eicient mixing and reduce mass transfer limitations. The aim is to develop and evaluate efective reactor systems and biocatalysts for the biodegradation of major contaminants in petroleum reinery wastewater. This chapter examines the diferent available options for the treatment of reinery wastewater with more focus on novel biotreatment options.

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“…Phenol is one of the most frequent contaminators in waste water of producing resin, plastic, yarn, petrochemical, coal, ceramic, glue, iron, steel, aluminum, leather, food process and etc. Furthermore, phenol is used as a solvent, disinfectant and an additive to increase the effectiveness of disinfectant (2)(3)(4)(5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Removal Efficiency of Phenol from Aqueous Solutions using Moringa Peregrina Tree Shell Ash

Zarei

Bazrafshan²,

Faridi

et al. 2013

Iran J Health Sci

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Background and purpose: Phenol is one of prevalent contaminants found in many industrial wastewaters. The combination with special features, such as high toxicity, carcinogenic properties, vitality gathering ability, low biodegradation potentiality and others, based on the U.S Environmental Protection Agency, classified as a priority pollutant. The purpose of this study was to determine the efficiency of Moringa Peregrina tree shell ash for the removal of phenol from aqueous solutions. Materials and Methods:This study is experimental and pilot scale. To determine the efficiency of Moringa Peregrina tree shell ash for the removal of phenol from aqueous solutions; the examination was carried out in a batch system. To achieve the aim of this study, the effect of each of the parameters affecting the adsorption process, such as initial pH of solution, contact time, adsorbent dose and initial concentration of phenol in solution were studied.Results: The results showed that the highest percentage of phenol removal by the ash occurred at pH 6, initial concentration100 mg.L -1 and adsorbent dose 0.4 g/l in which the 79.96% phenol was removed. For the analysis of the absorption constant, the Freundlich and Langmuir isotherm were used. The results showed that the experimental data fit the Langmuir (R 2 =0.9833) much better than the Freundlich model (R 2 =0.9373). Conclusion:According to the results of this study, it was found that the Moringa Peregrina tree shell ash is not only a low-cost adsorbent but also has a high performance in the removal of phenol from aqueous solutions.

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Combined effects of external mass transfer and biodegradation rates on removal of phenol by immobilized Ralstonia eutropha in a packed bed reactor

Cited by 92 publications

References 30 publications

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Organic Contaminants in Refinery Wastewater: Characterization and Novel Approaches for Biotreatment

The Evaluation of Removal Efficiency of Phenol from Aqueous Solutions using Moringa Peregrina Tree Shell Ash

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