Enhanced biodegradation of phenol in a novel cyclic activated sludge integrated with a rotating bed bioreactor in anoxic and peroxidase-mediated conditions

Pourakbar, Mojtaba; Moussavi, Gholamreza; Yaghmaeian, Kamyar

doi:10.1039/c7ra12997a

Cited by 19 publications

(6 citation statements)

References 52 publications

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“…Therefore, biofilm-mediated bioremediation processes are also widely used in wastewater treatment. Coaggregation and biofilm formation has been shown to enhance the phenol tolerance [79][80][81].…”

Section: Comparison Of Biofilm Formation Ability Of the Strains Icp1 And Ictn13 And Their Mixturementioning

confidence: 99%

Microbial Metabolic Potential of Phenol Degradation in Wastewater Treatment Plant of Crude Oil Refinery: Analysis of Metagenomes and Characterization of Isolates

et al. 2020

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The drilling, processing and transportation of oil are the main sources of pollution in water and soil. The current work analyzes the microbial diversity and aromatic compounds degradation potential in the metagenomes of communities in the wastewater treatment plant (WWTP) of a crude oil refinery. By focusing on the degradation of phenol, we observed the involvement of diverse indigenous microbial communities at different steps of the WWTP. The anaerobic bacterial and archaeal genera were replaced by aerobic and facultative anaerobic bacteria through the biological treatment processes. The phyla Proteobacteria, Bacteroidetes and Planctomycetes were dominating at different stages of the treatment. Most of the established protein sequences of the phenol degradation key enzymes belonged to bacteria from the class Alphaproteobacteria. From 35 isolated strains, 14 were able to grow on aromatic compounds, whereas several phenolic compound-degrading strains also degraded aliphatic hydrocarbons. Two strains, Acinetobacter venetianus ICP1 and Pseudomonas oleovorans ICTN13, were able to degrade various aromatic and aliphatic pollutants and were further characterized by whole genome sequencing and cultivation experiments in the presence of phenol to ascertain their metabolic capacity in phenol degradation. When grown alone, the intermediates of catechol degradation, the meta or ortho pathways, accumulated into the growth environment of these strains. In the mixed cultures of the strains ICP1 and ICTN13, phenol was degraded via cooperation, in which the strain ICP1 was responsible for the adherence of cells and ICTN13 diminished the accumulation of toxic intermediates.

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Section: Comparison Of Biofilm Formation Ability Of the Strains Icp1 And Ictn13 And Their Mixturementioning

confidence: 99%

Microbial Metabolic Potential of Phenol Degradation in Wastewater Treatment Plant of Crude Oil Refinery: Analysis of Metagenomes and Characterization of Isolates

et al. 2020

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“…Rotating bed bioreactors, however, can provide some more homogeneity to the contents of the vessel by means of rotation employed. Applications of these systems also include biocatalysis [ 105 , 106 ] and wastewater treatment [ 107 , 108 ], and it has already seen use in mammalian cell culture [ 109 ].…”

Section: Single-use Bioreactors For Stem Cell Biomanufacturingmentioning

confidence: 99%

Single-Use Bioreactors for Human Pluripotent and Adult Stem Cells: Towards Regenerative Medicine Applications

Rodrigues

2021

Bioengineering

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Research on human stem cells, such as pluripotent stem cells and mesenchymal stromal cells, has shown much promise in their use for regenerative medicine approaches. However, their use in patients requires large-scale expansion systems while maintaining the quality of the cells. Due to their characteristics, bioreactors have been regarded as ideal platforms to harbour stem cell biomanufacturing at a large scale. Specifically, single-use bioreactors have been recommended by regulatory agencies due to reducing the risk of product contamination, and many different systems have already been developed. This review describes single-use bioreactor platforms which have been used for human stem cell expansion and differentiation, along with their comparison with reusable systems in the development of a stem cell bioprocess for clinical applications.

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“…Gürtekin ( 2019) added a zeolite powder to enhance the performance of SBR for the treatment of high strength wastewater especially under low temperature with four cycles performed per day. Pourakbar et al, (2018) reported that attached biofilm is more tolerant to toxic compounds compared to suspended biomass. Yusoff et al, (2016) stated that the inhibitory effect of phenol on the metabolic activities of microorganisms was lowered in hybrid growth systems (including suspended and attached growth systems).…”

Section: Introductionmentioning

confidence: 99%

Upgrading sequencing batch reactor using attached biofilm

Abdelaziz¹,

Fouad

Mossad

2021

Water Environment Research

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A conventional sequencing batch reactor (SBR) was upgraded using fixed biofilm carriers with a specific surface area around 18 m 2 m −3 . The upgraded SBR was investigated to remove phenol from high strength wastewater operated under various operational conditions. The operational conditions used were variable volume exchange ratio (VER) up to 75%, hydraulic retention time (HRT) from (10.7-21.3 hr), aeration time (from 2 to 8 hr), and initial phenol concentration up to 600 mg L −1 . It was found that the upgraded SBR increased the removal efficiencies of biological oxygen demand (BOD 5 ), chemical oxygen demand (COD), and total suspended solids (TSS) by about 10% using high strength wastewater without phenol compared to SBR. Furthermore, the removal rate of phenol for the upgraded SBR was higher than conventional SBR by about 18% at 600 mg L − of initial phenol concentration under the same operational conditions. Compared to the conventional SBR, the upgraded version reduced the aeration step by 25% and achieved higher removal efficiency of phenol. Moreover, it reduced the excess sludge by about 23% and enhanced its properties by lowering the sludge volume index (SVI) by about 33%. © 2021 Water Environment Federation • Practitioner points• Upgrading conventional SBR by adding biofilm carriers is necessary for wastewater treatment with high strength wastewater. • The upgraded SBR has a higher resistance toward phenol compound due to the presence of the attached biofilm. • The upgraded SBR enhances sludge settling properties, decreases the amount of excess sludge, and also reduces the start-up period. • The number of cycles per day by upgraded SBR was more than the conventional SBR by 15%. • The upgraded SBR is an effective system and has good operational stability.

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Enhanced biodegradation of phenol in a novel cyclic activated sludge integrated with a rotating bed bioreactor in anoxic and peroxidase-mediated conditions

Abstract: Cyclic activated sludge integrated with a rotating bed bioreactor (CASIR) was used for phenol biodegradation.

Cited by 19 publications

References 52 publications

Microbial Metabolic Potential of Phenol Degradation in Wastewater Treatment Plant of Crude Oil Refinery: Analysis of Metagenomes and Characterization of Isolates

Microbial Metabolic Potential of Phenol Degradation in Wastewater Treatment Plant of Crude Oil Refinery: Analysis of Metagenomes and Characterization of Isolates

Single-Use Bioreactors for Human Pluripotent and Adult Stem Cells: Towards Regenerative Medicine Applications

Upgrading sequencing batch reactor using attached biofilm

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