Fate of Environmental Pollutants

Padhye, Lokesh P.; Tezel, Ulaş

doi:10.2175/106143014x14031280668371

Cited by 6 publications

(1 citation statement)

References 85 publications

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“…A similar observation was made by Li and Zhang [ 19 ]. The removal of pharmaceuticals, including antibiotics, using various mechanisms, such as constructed wetland (CW) and stabilization ponds (SP), lead to two conventional wastewater treatment processes (activated sludge (AS) and micro-power biofilm (MP) [ 4 , 20 ]). They were able to detect antibiotics in both the influent and effluent samples.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the Biodegradation of Veterinary Antibiotics Using Kinetics Model and Response Surface Methodology

et al. 2022

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The inappropriate use and indiscriminate disposal of antibiotics has become a menace worldwide. The incomplete removal of these contaminants from wastewater treatment plants has also contributed to this. This study presents the biodegradation of two veterinary antibiotics; ciprofloxacin (CIP) and enrofloxacin (ENRO). Kinetics models were explored to understand the dynamics of biodegradation in an anaerobic digestion process. This was carried out in batch reactors under various operating conditions: pH, organic loading rate (OLR), and antibiotic concentration. The influence of the parameters was investigated using a response surface methodology (RSM) based on the Box–Behnken experimental design of 15 runs. The data obtained were fitted on a polynomial function model. OLR and pH exhibited a synergistic and antagonistic effect in the response models developed, with a high correlation regression coefficient (R2; 0.9834–0.9875) close to 1 at a 95% confidence level. The optimum conditions obtained from the RSM numerical optimization were pH (6), OLR (2 kgCOD·m−3·days−1), and an antibiotic concentration of 75%, which gave the removal of CIP, ENRO, and COD, respectively, as 80%, 83%, and 73% at a desirability function of 85%. The kinetics study shows that the biodegradation of antibiotics was well fitted on a first-order model (R2; 0.9885–0.9978) with rate constants ranging from 0.0695 to 0.96 days−1.

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Section: Discussionmentioning

confidence: 99%

Evaluating the Biodegradation of Veterinary Antibiotics Using Kinetics Model and Response Surface Methodology

et al. 2022

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Groundwater Contamination by Microconstituents

Chen

Surampalli

et al. 2023

Microconstituents in the Environment

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Aggregation kinetics and mechanisms of silver nanoparticles in simulated pollution water under UV light irradiation

Zhang

Shang

et al. 2019

Water Environment Research

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This paper investigated the effect mechanism of complex components (fulvic acid [FA], sodium dodecylbenzene sulfonate [SDBS], and sodium nitrate [NaNO 3 ]) on the aggregation kinetics of polyvinylpyrrolidone-modified silver nanoparticles (PVP-AgNPs) under UV irradiation. The results showed that FA and NaNO 3 alone did not cause aggregation due to the high steric hindrance and/or electrostatic repulsive forces. In high concentration of SDBS solution (20-50 mM), the stability of PVP-AgNPs was reduced by adsorbing SDBS on nanoparticle surface and replacing their PVP coatings. A mixed system of two pollutants had a synergistic effect on PVP-AgNPs aggregation. In the mixed system of SDBS and FA, the interaction of SDBS and PVP-AgNPs dominated the aggregation of PVP-AgNPs. NaNO 3 significantly improved the aggregation rate of PVP-AgNPs in SDBS solution due to the charge neutralization effect of electrolyte. In 20 mg/L FA solution, the aggregation rate increased slightly with increasing NaNO 3 concentration from 50 to 200 mM due to the charge neutralization effect, while the hydrodynamic diameters of PVP-AgNPs increased linearly and rapidly to micrometer size because the spatial conformation of adsorbed FA became compact in high-salinity solution. The calculation results of eDLVO theory were basically consistent with most of the experimental results. © 2019 Water Environment Federation • Practitioner points• PVP-AgNPs was uniformly dispersed in NaNO 3 or FA solution under UV irradiation. • PVP-AgNPs formed aggregates in SDBS solutions under UV irradiation.• A system with two mixed pollutants had a synergistic effect on promoting aggregation of PVP-AgNPs. • eDLVO theory could explain the aggregation results in different chemical conditions except in NaNO 3 solution.

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Fate of Environmental Pollutants

Cited by 6 publications

References 85 publications

Evaluating the Biodegradation of Veterinary Antibiotics Using Kinetics Model and Response Surface Methodology

Evaluating the Biodegradation of Veterinary Antibiotics Using Kinetics Model and Response Surface Methodology

Groundwater Contamination by Microconstituents

Aggregation kinetics and mechanisms of silver nanoparticles in simulated pollution water under UV light irradiation

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