Virgin (Fe0) and microbially regenerated (Fe2+) iron turning waste for treating chlorinated pesticides in water

Abbas, Tauqeer; Wadhawan, Tanush; Khan, Asad; McEvoy, John; Khan, Eakalak

doi:10.1016/j.jhazmat.2020.122980

Cited by 15 publications

(5 citation statements)

References 56 publications

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“…Therefore, continuous monitoring and risk assessment of DRINs should be carried out in the future. If necessary, physical and chemical methods [ 76 ] or microbial metabolism [ 77 , 78 ] can be used to degrade residual DRINs to ensure and control the safety of water use [ 55 ].…”

Section: Discussionmentioning

confidence: 99%

Distribution, Sources, and Risk Assessment of Organochlorine Pesticides in Water from Beiluo River, Loess Plateau, China

Guo¹,

Chen

et al. 2023

Toxics

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The Loess Plateau has been a focus of public discussion and environmental concerns over the past three decades. In this study, in order to investigate the effect of OCP pollution in water of the Beiluo River, concentrations of 25 OCPs at 17 locations in the water were examined. The results showed that the concentration of ∑OCPs in the water ranged from 1.76 to 32.57 ng L−1, with an average concentration of 7.23 ng L−1. Compared with other basins in China and abroad, the OCP content in the Beiluo River was at a medium level. Hexachlorocyclohexane (HCH) pollution in the Beiluo River was mainly from the mixed input of lindane and technical HCHs. Dichlorodiphenyltrichloroethane (DDT) pollution was mainly from the mixed input of technical DDTs and dicofol. Most of the OCP pollution came from historical residues. The risk assessment results showed that hexachlorobenzene (HCB) and endosulfan had high ecological risks in the middle and lower reaches of the Beiluo River. Most residual OCPs were not sufficient to pose carcinogenic and non-carcinogenic health risks to humans. The results of this study can provide a reference for OCP prevention and control and watershed environmental management.

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Section: Discussionmentioning

confidence: 99%

Distribution, Sources, and Risk Assessment of Organochlorine Pesticides in Water from Beiluo River, Loess Plateau, China

Guo¹,

Chen

et al. 2023

Toxics

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“…The non-pathogenic bacterium Shevanella oneidensis does not directly degrade dieldrin, but can efficiently reduce about 80% of dissolved ferric iron (Fe 3+ ) to ferrous iron (Fe 2+ ) within 72 h. The effective removal time of many organochlorine pesticides (OCPs) is greatly reduced by the catalysis of ferrous iron (Fe 2+ ). When the iron dosage was increased from 2.5 × 10 3 mg⋅L –1 to 1.5 × 10 4 mg⋅L –1 , the removal rate of dieldrin was increased by 23.3% ( Abbas et al, 2020 ). Physicochemical reactions are rarely used in real life because they cannot completely degrade compounds and are limited to large instruments ( Lin et al, 2020 ).…”

Section: Degradation Of Aldrin and Dieldrinmentioning

confidence: 99%

“…As a result of the extensive use of aldrin and dieldrin, many non-microbial resistance genes have been detected in many places. The researchers isolated many strains that were able to effectively degrade aldrin and dieldrin ( Abbas et al, 2020 ). The carbon component is an important driver of microbial community and function.…”

Section: Introductionmentioning

confidence: 99%

Microbial Degradation of Aldrin and Dieldrin: Mechanisms and Biochemical Pathways

Pang

Lin

et al. 2022

Front. Microbiol.

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As members of the organochlorine group of insecticides, aldrin and dieldrin are effective at protecting agriculture from insect pests. However, because of excessive use and a long half-life, they have contributed to the major pollution of the water/soil environments. Aldrin and dieldrin have been reported to be highly toxic to humans and other non-target organisms, and so their use has gradually been banned worldwide. Various methods have been tried to remove them from the environment, including xenon lamps, combustion, ion conversion, and microbial degradation. Microbial degradation is considered the most promising treatment method because of its advantages of economy, environmental protection, and convenience. To date, a few aldrin/dieldrin-degrading microorganisms have been isolated and identified, including Pseudomonas fluorescens, Trichoderma viride, Pleurotus ostreatus, Mucor racemosus, Burkholderia sp., Cupriavidus sp., Pseudonocardia sp., and a community of anaerobic microorganisms. Many aldrin/dieldrin resistance genes have been identified from insects and microorganisms, such as Rdl, bph, HCo-LGC-38, S2-RDLA302S, CSRDL1A, CSRDL2S, HaRdl-1, and HaRdl-2. Aldrin degradation includes three pathways: the oxidation pathway, the reduction pathway, and the hydroxylation pathway, with dieldrin as a major metabolite. Degradation of dieldrin includes four pathways: oxidation, reduction, hydroxylation, and hydrolysis, with 9-hydroxydieldrin and dihydroxydieldrin as major products. Many studies have investigated the toxicity and degradation of aldrin/dieldrin. However, few reviews have focused on the microbial degradation and biochemical mechanisms of aldrin/dieldrin. In this review paper, the microbial degradation and degradation mechanisms of aldrin/dieldrin are summarized in order to provide a theoretical and practical basis for the bioremediation of aldrin/dieldrin-polluted environment.

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“…Considering the high toxicity and lethal effects of copper on life, several researchers have proposed many effective ways of removing copper from wastewater and groundwater [3,[8][9][10][11][12][13][14] . Among the proposed removal techniques (ion exchange, adsorption, complexation, electrodialysis, membrane technology, bioremediation, solvent extraction and chemical treatment), nanotechnology is the most efficient and effective [15][16][17][18][19] Nanoscale zero-valent iron (nZVI) has been employed extensively to remove contaminants such as dyes [20,21] , nitrates [22,23] , heavy metals [24][25][26][27] , chloro-organic compounds [28][29][30] , chlorinated pesticides and organophosphates [31,32] from wastewater and groundwater. Its removal mechanisms during reaction with heavy metals include adsorption (Zn, Cd, Ni, Pb, Cr, Co, Se, Ba, U, As), reduction (Cu, U, As, Pt, Hg, Ni, Ag, Pb, Cr), precipitation (Cd, Cu, Pb, Co, Zn), co-precipitation (Cd, Co, Cu, Zn, Pb), oxidation (Se, Pb, As, U), chemisorption and diffusion through pores [33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

An insight into the fate of Cu2+ and zero-valent iron during removal of Cu2+ by nanoscale zero-valent iron

Anang¹,

Liu²,

Fan³

2023

Water Emerg Contam & Nanoplastics

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Aim: The transformation of zero-valent iron (Fe0) and Cu2+ during Cu2+ removal by nanoscale zero-valent iron (nZVI) has not been properly investigated using modern analytical techniques, despite its importance in environmental toxicology and surface chemistry associated with wastewater treatment/groundwater remediation. This study critically examines the phenomenon using a variety of modern instruments that characterize the physical and chemical properties of materials and provides extensive comprehension of the subject. Methods: As-prepared nZVI was used to remove Cu2+ in 5 mmol/L CuSO4. The morphological and structural characteristics of the Cu2+ and nZVI after removal were investigated with the aid of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometry (XPS). Results: Complete removal of Cu2+ by the nZVI was achieved within 60 min and remained constant till 120 min. The Cu2+ got reduced into cuprite (Cu2O) and copper metal (Cu0) (the crystals of both transformation products were cubic), while the Fe0 nanoparticles transformed into lath-like lepidocrocite (γ-FeOOH) and twin-rod goethite (α-FeOOH). The mechanism of Fe0 transformation was that the Fe2+ produced by Fe0 corrosion and oxidation by Cu2+ was hydrolyzed and oxidized to form hydropyrite, which was later converted into lepidocrocite and goethite with the assistance of Fe2+. The transformation of Cu2+ was due to the strong reduction property of Fe0. The toxicity and bioavailability of the transformed products were lower than those of Cu2+ and Fe0 nanoparticles. Conclusion: The findings are critical in understanding the fate of Fe0 nanoparticles and Cu2+ during Cu2+ removal by nZVI and can provide guidance for the application of nZVI technology.

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Virgin (Fe0) and microbially regenerated (Fe2+) iron turning waste for treating chlorinated pesticides in water

Cited by 15 publications

References 56 publications

Distribution, Sources, and Risk Assessment of Organochlorine Pesticides in Water from Beiluo River, Loess Plateau, China

Distribution, Sources, and Risk Assessment of Organochlorine Pesticides in Water from Beiluo River, Loess Plateau, China

Microbial Degradation of Aldrin and Dieldrin: Mechanisms and Biochemical Pathways

An insight into the fate of Cu2+ and zero-valent iron during removal of Cu2+ by nanoscale zero-valent iron

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