Biophotodegradation of pollutants from wastewater

Rodríguez‐Couto, Susana

doi:10.1016/b978-0-12-820318-7.00013-7

Cited by 4 publications

(6 citation statements)

References 44 publications

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“…The Fe-TiO 2 electrons (h + and e − ), once illuminated by the UV-light, becomes excited as charged carriers, which are then transported via diffusion mass transfer. In the bio-photo sequence, the biodegradable pollutants were treated biologically, whereas the nonbiodegradable pollutants were photodegraded [21,26]. Also, the kinetic study, as well as the biogas output and composition, were monitored.…”

Section: Resultsmentioning

confidence: 99%

“…Also, the production of nitrates (TN) and ammonium (NH 4 + ) during the degradation pathway suggests that there was mineralization of the recalcitrant nitrogen-containing organic compounds, such as TKN, NO 3 -N, and NH 4 + in different proportions [27,30]. Thus, during the reductive pathway, the amount of TN present in the wastewater, at a high oxidation state, produced more unstable intermediates such as TKN and NH 4 + [21]. Likewise, in the lower oxidation state, most of the elemental nitrogen molecules detached resulting in nitrites (NO 3 − ).…”

Section: Hydroxyl Radicals Ohmentioning

confidence: 99%

“…In addressing this setback, a combination of biocatalysis with photocatalysis is receiving significant interest due to their single treatment inefficiency or high cost. Rodríguez-Couto [21] reported on biophotodegradation of emerging pollutants from the wastewater as a promising technology. Molla, et al [22] also reviewed recent trends in nanomaterials and nanocomposites for environmental applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, engineered magnetized photocatalysts could easily be separated from a solution by an external magnet after the biophotocatalytic activity [23][24][25]. Herein, in a biophotocatalytic sequential system, a number of limitations can still be observed, including high electricity consumption, high building costs, and high operating expenses [21]. The aforementioned drawbacks can be overcome by combining photochemical and biological techniques, resulting in photocatalysis and biodegradation occurring simultaneously [26].…”

Section: Introductionmentioning

confidence: 99%

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Anaerobic Digested Wastewater CO2 Sequestration Using a Biophotocatalytic System with a Magnetized Photocatalyst (Fe-TiO2)

2022

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This study presents a biophotocatalytic system as a sustainable technology for the recovery of clean water and renewable energy from wastewater, thereby providing a unique opportunity to drive industrialization and global sustainable development throughputs. Herein, inhouse magnetized photocatalyst (Fe-TiO2) with surface area 62.73 m2/g synthesized via co-precipitation, was hypothesized to hasten an up-flow anaerobic sludge blanket (UASB) reactor for the treatment of local South Africa municipality wastewater with the benefit of high-quality biogas production. A lab scale UASB process with a working volume of 5 L coupled with two UV-lights (T8 blacklight-blue tube, 365 nm, 18 W) was operated batchwise under mesophilic conditions for the period of 30 days with a constant organic load charge of 2.76 kg COD/m3. d. This biophotocatalytic system performance was investigated and compared with and without the Fe-TiO2 charge (2–6 g) with respect to effluent quality, biogas production and CO2 methanation. Using chemical oxygen demand (COD) measured as the degree of degradation of the pollutants, the best efficiency of 93% COD removal was achieved by a 4 g Fe-TiO2 charge at 14 days and pH of 7.13, as compared to zero charge where only 49.6% degradation was achieved. Under the same charge, cumulative biogas and methane content of 1500 mL/g COD.d and 85% were respectively attained as compared with the control with 400 mL/g COD.d and 65% methane content. Also, the energy produced can be used to offset the energy utilized by the UV-light for the wastewater abatement and other limitations of photocatalysis. The BP system was found to be an eco-friendly and cost-effective technology to be explored in water treatment settings.

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Section: Resultsmentioning

confidence: 99%

Section: Hydroxyl Radicals Ohmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anaerobic Digested Wastewater CO2 Sequestration Using a Biophotocatalytic System with a Magnetized Photocatalyst (Fe-TiO2)

2022

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“…Many authors have demonstrated the significant contribution of laccases and peroxidases to the degradation of xenobiotic compounds [ 16 , 135 , 136 ]. However, there is growing evidence that intracellular enzymes of WRF such as monooxygenases, especially cytochrome P450s (CYP450), are also associated with the degradation of organic pollutants [ 103 , 137 ].…”

Section: Main Enzymes Associated With the Degradation Of Xenobioticsmentioning

confidence: 99%

White Rot Fungi as Tools for the Bioremediation of Xenobiotics: A Review

Torres-Farradá,

Thijs,

Rineau

et al. 2024

JoF

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Industrial development has enhanced the release into the environment of large quantities of chemical compounds with high toxicity and limited prospects of degradation. The pollution of soil and water with xenobiotic chemicals has become a major ecological issue; therefore, innovative treatment technologies need to be explored. Fungal bioremediation is a promising technology exploiting their metabolic potential to remove or lower the concentrations of xenobiotics. In particular, white rot fungi (WRF) are unique microorganisms that show high capacities to degrade a wide range of toxic xenobiotic compounds such as synthetic dyes, chlorophenols, polychlorinated biphenyls, organophosphate pesticides, explosives and polycyclic aromatic hydrocarbons (PAHs). In this review, we address the main classes of enzymes involved in the fungal degradation of organic pollutants, the main mechanisms used by fungi to degrade these chemicals and the suitability of fungal biomass or extracellular enzymes for bioremediation. We also exemplify the role of several fungi in degrading pollutants such as synthetic dyes, PAHs and emerging pollutants such as pharmaceuticals and perfluoroalkyl/polyfluoroalkyl substances (PFASs). Finally, we discuss the existing current limitations of using WRF for the bioremediation of polluted environments and future strategies to improve biodegradation processes.

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Role of microbial laccases in valorization of lignocellulosic biomass to bioethanol

Haq,

Saleem,

Chaudhary

et al. 2024

Front. Bioeng. Biotechnol.

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The persistent expansion in world energy and synthetic compounds requires the improvement of renewable alternatives in contrast to non-sustainable energy wellsprings. Lignocellulose is an encouraging feedstock to be utilized in biorefineries for its conversion into value-added products, including biomaterials, biofuels and several bio-based synthetic compounds. Aside from all categories, biofuel, particularly bioethanol is the most substantial fuel derived from lignocellulosic biomass and can be obtained through microbial fermentation. Generally, extreme settings are required for lignocellulosic pretreatment which results in the formation of inhibitors during biomassdegradation. Occasionally, lignin polymers also act as inhibitors and are left untreated during the pretreatment, engendering inefficient hydrolysis. The valorization of lignocellulosic biomass by laccases can be viewed as a fundamental trend for improving bioethanol production. However, one of the main obstacles for developing commercially viable biofuel industries is the cost of enzymes, which can be resolved by utilizing laccases derived from microbial sources. Microbial laccases have been considered an exceptionally integral asset for delignification and detoxification of pretreated LCB, which amplify the resultant fermentation and saccharification processes. This review provides a summary of microbial laccases and their role in valorizing LCB to bioethanol, compelling enthralling applications in bio-refining industries all across the globe.

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Biophotodegradation of pollutants from wastewater

Cited by 4 publications

References 44 publications

Anaerobic Digested Wastewater CO2 Sequestration Using a Biophotocatalytic System with a Magnetized Photocatalyst (Fe-TiO2)

Anaerobic Digested Wastewater CO2 Sequestration Using a Biophotocatalytic System with a Magnetized Photocatalyst (Fe-TiO2)

White Rot Fungi as Tools for the Bioremediation of Xenobiotics: A Review

Role of microbial laccases in valorization of lignocellulosic biomass to bioethanol

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