Biocatalytic membrane reactors for the removal of recalcitrant and emerging pollutants from wastewater

Hai, Faisal I.; Nghiem, Long D.; Modin, Oskar

doi:10.1533/9780857097347.4.763

Cited by 13 publications

(8 citation statements)

References 174 publications

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“…The enzymatic oxidation of resistant pollutants is an environmentally friendly alternative method compared to conventional physicochemical methods (Hai et al, 2013). Over the past three decades, the use of biodegradation by enzyme has received a great deal of attention as an environmentally sustainable solution.…”

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

Modeling and Optimization of Removal of Cefalexin From Aquatic Solutions by Enzymatic Oxidation Using Experimental Design

Shokoohi

Samadi

Amani

et al. 2018

Braz. J. Chem. Eng.

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Antibiotics are used globally and, after use, they enter water sources in different ways. The presence of these compounds in the environment has created concerns about the toxicity of aquatic organisms and the emergence of antibiotic-resistant bacteria. The purpose of this study was to remove cefalexin from aqueous solutions by enzymatic oxidation using response surface methodology (RSM). For this purpose, batch experiments were performed to evaluate the effect of independent variables, including temperature, pH, contact time, enzyme activity, HBT mediator concentration, and antibiotic concentration. The residual cefalexin concentration was determined by HPLC. The Box-Behnken design of experiments and RSM were used to evaluate the overlap between variables. The results showed that the oxidation efficiency increased with increasing contact time and enzyme activity and decreasing antibiotic concentration. The highest and lowest removal percentages were 90.5% and 5.54%, respectively. Considering the value of R 2 (0.946) and adjusted R 2 (0.95) in the RSM model, one can state that the selected model is suitable for data analysis. Finally, the second-order polynomial analysis and the quadratic model were used as the best model for finding the relationship between the main variables and cefalexin removal efficiency. The Box-Behnken Design model can be effective for optimizing enzymatic oxidation of cefalexin, and laccase can be used to remove cefalexin.

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Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

Modeling and Optimization of Removal of Cefalexin From Aquatic Solutions by Enzymatic Oxidation Using Experimental Design

Shokoohi

Samadi

Amani

et al. 2018

Braz. J. Chem. Eng.

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“…The potential of WRF for the removal of PPCPs has been investigated mostly in batch mode. There are only a few studies on continuous flow reactor configurations [24,26,28,29,30]. Despite a significant research effort, efficient removal of PPCPs by WRF mediated treatment, their removal mechanisms and degradation pathways remain largely to be elucidated.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Pharmaceuticals and Personal Care Products by White-Rot Fungi—a Critical Review

et al. 2017

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White-rot fungi (WRF) mediated treatment can offer an environmentally friendly platform for the removal of pharmaceuticals and personal care products (PPCPs) from wastewater. These PPCPs may have adverse impacts on aquatic organisms and even human and thus their removal during wastewater treatment is of significant interest to the water industry. Whole-cell WRF or their extracellular lignin modifying enzymes (LMEs) have been reported to efficiently degrade PPCPs that are persistent to conventional activated sludge process. WRF mediated treatment of PPCPs depends on a number of factors including physicochemical properties of PPCPs (e.g., hydrophobicity and chemical structure) and wastewater matrix (e.g., pH, temperature, and dissolved constituents), type of WRF species and their specific extracellular enzymes. This review critically analyzes the performance of whole-cell WRF and their LMEs for the removal of PPCPs; particularly, it offers insights into PPCP removal mechanisms (e.g., biosorption vs. biodegradation) and degradation pathways as well as the formation of intermediate byproducts.

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“…In the absence of redox-mediators, a 37% laccase inactivation was observed over a period of 12 h. This was possibly due to the blockage of the active enzyme sites by the charged metabolites and/or hydraulic stress during membrane filtration [25,41]. Since the MD membrane can conceptually retain all nonvolatile organics including the transformation products/radicals, laccase inactivation with or without the presence of redoxmediators can be expected.…”

Section: Effect Of Mediators On Enzyme Stabilitymentioning

confidence: 99%

“…This indicates the necessity of formulating means to enhance biodegradation of TrOCs. In this context, it is noteworthy that recent reports confirm enhanced laccase-catalyzed degradation of selected TrOCs that are not amenable to degradation by conventional activated sludge [25,26]. However, the performance of a high retention-enzymatic membrane bioreactor for the removal of a wide range of TrOCs remains to be elucidated.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor

et al. 2017

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A high retention enzymatic bioreactor was developed by coupling membrane distillation with an enzymatic bioreactor (MD-EMBR) to investigate the degradation of 13 phenolic and 17 non-phenolic trace organic contaminants (TrOCs). TrOCs were effectively retained (90-99%) by the MD membrane. Furthermore, significant laccase-catalyzed degradation (80-99%) was achieved for 10 phenolic and 3 non-phenolic TrOCs that contain strong electron donating functional groups. For the remaining TrOCs, enzymatic degradation ranged from 40 to 65%. This is still higher than those reported for enzymatic bioreactors equipped with ultrafiltration membranes, which retained laccase but not the TrOCs. Addition of three redox-mediators, namely syringaldehyde (SA), violuric acid (VA) and 1-hydroxybenzotriazole (HBT), in the MD-EMBR significantly broadened the spectrum of efficiently degraded TrOCs. Among the tested redox-mediators, VA (0.5 mM) was the most efficient and versatile mediator for enhanced TrOC degradation. The final effluent (i.e., membrane permeate) toxicity was below the detection limit, although there was a mediator-specific increase in toxicity of the bioreactor media.

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Biocatalytic membrane reactors for the removal of recalcitrant and emerging pollutants from wastewater

Cited by 13 publications

References 174 publications

Modeling and Optimization of Removal of Cefalexin From Aquatic Solutions by Enzymatic Oxidation Using Experimental Design

Modeling and Optimization of Removal of Cefalexin From Aquatic Solutions by Enzymatic Oxidation Using Experimental Design

Degradation of Pharmaceuticals and Personal Care Products by White-Rot Fungi—a Critical Review

Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor

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