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Uptake and translocation of sulfamethazine by alfalfa grown under hydroponic conditions

Journal of Environmental Sciences 2017年第3期29卷 217-223页

作者： sudarshan kurwadkar Garrett Struckhoff Kameron Pugh Om Singh Department of Civil and Environmental Engineering California State UniversityFullertonCA 92831USA IDS Engineering Group HoustonTX 77040USA Division of Biological and Health Sciences University of PittsburghBradfordPA 16701USA

Antibiotics are routinely used in intensive animal agriculture operations collectively known as Concentrated Animal Feed Operations （CAFO） which include dairy, poultry and swine farms. Wastewater generated by CAFOs often contains low levels of antibiotics and is typically managed in an anaerobic lagoon. The objective of this research is to investigate the uptake and fate of aqueous sulfamethazine （SMN） antibiotic by alfalfa （Medicago satiua） grass grown under hydroponic conditions. Uptake studies were conducted using hydroponically grown alfalfa in a commercially available nutrient solution supplemented with 10 mg/L of SMN antibiotic. Analysis of alfalfa sap, root zone, middle one-third, and top portion of the foliage showed varying uptake rate and translocation of SMN. The highest average amount of SMN （8.58 μg/kg） was detected in the root zone, followed by the top portion （1.89μg/kg）, middle one-third （1.30 μg/kg）, and sap （0.38 μg/kg） samples, indicating a clear distribution of SMN within the sampled regions. The ultraviolet （UV） spectra of parent SMN and translocated SMN identified in different parts of the plant present the possibility of metabolization during the uptake process. Uptake of SMN using alfalfa grown under hydroponic conditions has potential as a promising remediation technology for removal of similar antibiotics from wastewater lagoons.

关键词： AlfalfaHydroponic cultureAntibioticsSulfamethazineConcentrated Animal Feed OperationsPhytoremediation

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Long-term performance evaluation of zero-valent iron amended permeable reactive barriers for groundwater remediation-A mechanistic approach

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Geoscience Frontiers 2023年第2期14卷 1-13页

作者： Michael Lawrinenko sudarshan kurwadkar Richard T.Wilkin Center for Environmental Solutions and Emergency Response U.S.Environmental Protection Agency919 Kerr Research DriveAdaOK 74820USA Department of Civil and Environmental Engineering California State University800 N.State College Blvd.FullertonCA 92831USA

Permeable reactive barriers(PRBs)are used for groundwater remediation at contaminated sites *** technology has been efficient at appropriate sites for treating organic and inorganic contaminants using zero-valent iron(ZVI)as a reductant and as a reactive *** development of the technology over the years suggests that a robust understanding of PRB performance and the mechanisms involved is still *** information in the scientific literature downplays the critical role of ZVI corrosion in the remediation of various organic and inorganic ***,there is a lack of information on how different mechanisms act in tandem to affect ZVI-groundwater systems through *** this review paper,we describe the underlying mechanisms of PRB performance and remove isolated *** discuss the primary mechanisms of ZVI transformation and aging in PRBs and the role of iron corrosion *** review numerous sites to reinforce our understanding of the interactions between groundwater contaminants and ZVI and the authigenic minerals that form within *** findings show that ZVI corrosion products and mineral precipitates play critical roles in the long-term performance of PRBs by influencing the reactivity of *** occlusion by mineral precipitates occurs at the influent side of PRBs and is enhanced by dissolved oxygen and groundwater rich in dissolved solids and high alkalinity,which negatively impacts hydraulic conductivity,allowing contaminants to potentially bypass the treatment *** development of site characterization tools and models is needed to support effective PRB designs for groundwater remediation.

关键词： Permeable reactive barrier Reduction potential Plating reactions Surface passivation Geochemistry Iron

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Preliminary studies on occurrence of monensin antibiotic in Bosque River Watershed

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Journal of Environmental Sciences 2013年第2期25卷 268-273页

作者： sudarshan kurwadkar Victoria Sicking Barry Lambert Anne McFarland Forrest Mitchell Environmental Engineering Department of Engineering and PhysicsBox T-0390Tarleton State UniversityStephenvilleTX 76402USA Environmental Engineering Program Department of Engineering and PhysicsTarleton State UniversityStephenvilleTX 76402USA Department of Animal Sciences Box T-0070Tarleton State UniversityStephenvilleTX 76402USA Texas Institute for Applied Environmental Research Box T-0410Tarleton State UniversityStephenvilleTX 76402USA Texas A&M AgriLife Research 1229 N.US Hwy 281StephenvilleTX 76401USA

Water quality impact due to excessive nutrients has been extensively studied. In recent years, however, micro-pollutants such as pharmaceuticals and hormonal products used in animal agriculture have added an additional impact to overall water quality. Pharmaceuticals used in the poultry, swine, beef, and dairy industries have been detected in various environmental matrices such as, soil, groundwater and surface water. In this study, 26 surface water samples were collected throughout the Bosque River Watershed （BRW） with samples representing a range of land use conditions and locations of major dairy operations. Samples were analyzed using commercially available Enzyme-Linked Immunosorbent Assay test. Of the 26 samples, three samples consistently tested positive for monensin antibiotic with concentration ranging from 0.30 to 3.41 μg/L. These three samples were collected from sites that received varying amount of agriculture wastes （11.7% to 31.3%） and located downstream from sites associated with moderate levels of animal agriculture. The preliminary results suggest that there is a potential for monensin occurrence in the BRW, although initial findings indicate only very low levels.

关键词： ELISA ionophore monensin antibiotic dairy waste emerging pollutants pharmaceuticals

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Reply to comment on“Long-term performance evaluation of zero-valent iron amended permeable reactive barriers for groundwater remediation–A mechanistic approach” by C. Noubactep, Geoscience Frontiers 14(2023), 101582

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Geoscience Frontiers 2023年第4期14卷 282-284页

作者： Michael Lawrinenko sudarshan kurwadkar Richard T.Wilkin Center for Environmental Solutions and Emergency Response U.S.Environmental Protection Agency919 Kerr Research DriveAdaOklahoma 74820USA Department of Civil and Environmental Engineering California State University800 N.State College Blvd.FullertonCA 92831USA

We welcome the opportunity to address comments provided by *** and to further emphasize the concepts developed in our article titled“Long–term performance evaluation of zero-valent iron amended permeable reactive ba... 详细信息

关键词： groundwater performance valent

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