Photodynamic inactivation of multidrug-resistant bacteria in wastewater effluent using green phytochemicals as a natural photosensitizer

Sarker, Mukta; Ahn, Young‐Ho

doi:10.1016/j.envpol.2022.120015

Cited by 10 publications

(6 citation statements)

References 51 publications

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“…In order to explore the antibacterial properties of specific components in plant extracts, in another report by the same team, antibacterial studies were conducted using two common plant extracts, pyrogallol (PGL) and terpinolene (TPN). 140 PGL promoted the generation of ˙OH radicals during the sterilization, whereas TPN produced 1 O 2 . Additionally, by comparing different light sources (white and blue diodes), it is found that the wider the light wave range, the more conducive to the material to produce active species.…”

Section: Natural Metal-free Materialsmentioning

confidence: 96%

Metal-free photocatalysts for solar-driven water disinfection: recent progress and challenges

Gong,

Yu,

Tong

et al. 2023

Catal. Sci. Technol.

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Section: Natural Metal-free Materialsmentioning

confidence: 96%

Metal-free photocatalysts for solar-driven water disinfection: recent progress and challenges

Gong,

Yu,

Tong

et al. 2023

Catal. Sci. Technol.

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“…Bacteria concentration was evaluated using the m-Endo agar plate counting method with total coliform (TC) as an indicator for bacterial contamination. 33 2.4. Fouling Experiments at Constant Potentials.…”

Section: Reactor Configuration and Feed Solutionmentioning

confidence: 99%

Advanced Tertiary Wastewater Treatment for Enhanced Effluent Quality by Electrically Conducting Membranes Operated at Altered Potential for Simultaneous Mitigation of Scaling and Biofouling

Cheng,

Qi,

Yang

et al. 2024

ACS EST Eng.

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Electrically conducting membranes (ECMs) present a promising low-fouling technology for advanced tertiary wastewater treatment, particularly when employed as cathodes to resist biofouling. However, the elevated pH levels near the cathode lead to severe scaling. This study investigated alternating the applied potentials in carbon-nanotube-based ECM to simultaneously mitigate biofouling and scaling while producing high-quality effluent. The research demonstrates that alternating −2.5 V cathodic and 1.5 V (vs Ag/AgCl) anodic potentials at 5 s intervals significantly reduce scaling and biofouling. In a 48 h filtration experiment using real secondary effluents, there was a notable decrease in trans-membrane pressure by 110 mbar, contrasting with the 320 mbar increase observed under open-circuit potential (OCP) conditions. Surface analysis confirms the absence of scaling and biofilm on the ECM layer under alternating potential operation, in contrast to high biofilm formation on the ECM at OCP conditions. The low scaling was attributed to controlled pH levels and the limited biofilm formation to the measured reactive oxygen species, facilitating bacterial detachment. The short duration of low anodic potential under alternating potential may also decrease carbon nanotube (CNT) oxidation and extend ECM lifetime. ECM-based filtration produced higher-quality effluents than conventional chlorination-coagulation-sand-filtration tertiary treatments. These findings highlight the potential of ECM-based filtration for sustained and efficient advanced wastewater treatment, surpassing the current conventional tertiary treatment technologies.

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“…Expectedly, photodynamic processes have been tested in some timely environmental applications as in tertiary wastewater treatment (Sarker and Ahn 2022a) addressing refractory contaminant degradation (Gmurek et al 2017), and disinfection (Sarker and Ahn 2022b), as well as microbial control in different water matrices (Bartolomeu et al 2022), for either remediation or drinking purposes (Valkov et al 2018, Mušković et al 2021. It is therefore relevant to explore current trends in PDT employed in such purposes, particularly because, even though there has been progress toward achieving SDG 6, a recent estimate suggested that it will not be fully accomplished unless effective change quadruples (WHO and UNICEF 2021b).…”

Section: Introduction and Fundamentalsmentioning

confidence: 99%

Photodynamic processes for water and wastewater treatment: a review

Silva,

Lima,

Dias

et al. 2024

Laser Phys. Lett.

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Photodynamic therapy (PDT) has been widely employed in clinical applications, healthcare, and public health (e.g. cancer research, microbiological control, vector control, etc). The photodynamic action is an advanced oxidation process based on the production of reactive oxygen species (ROS) and singlet oxygen by the excitation of a photosensitizer by specific wavelengths of light in the presence of molecular oxygen. The generation of ROS, which are highly reactive, encourages the use of PDT against recalcitrant pollutants and resistant parasites, a novel approach for PDT applications. Here, we explored recent research in PDT in water and wastewater treatment, elucidating operational conditions, main targets, potentials, and constraints, considering a collection of scientific papers curated by a well-defined research strategy. Retrieved records were filtered by subjects, and data was organized into a content network. Results showed that PDT is a timely alternative to deal with emerging chemical contaminants, resistant microorganisms, and other challenges, raising opportunities for versatile applications and sustainable solutions. Advances in environmental applications of PDT may help reach the Sustainable Development Goal 6 (SDG 6), but also positively impact other SDGs.

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Photodynamic inactivation of multidrug-resistant bacteria in wastewater effluent using green phytochemicals as a natural photosensitizer

Cited by 10 publications

References 51 publications

Metal-free photocatalysts for solar-driven water disinfection: recent progress and challenges

Metal-free photocatalysts for solar-driven water disinfection: recent progress and challenges

Advanced Tertiary Wastewater Treatment for Enhanced Effluent Quality by Electrically Conducting Membranes Operated at Altered Potential for Simultaneous Mitigation of Scaling and Biofouling

Photodynamic processes for water and wastewater treatment: a review

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