Search results for "Remediation"
showing 10 items of 278 documents
Xanthone-photosensitized detoxification of the veterinary anthelmintic fenbendazole
2013
Fenbendazole (1) is a common veterinary anthelmintic, toxic to water living microorganisms. Fluorescence quantum yields of 1 were found to be 0.11 in acetonitrile, 0.068 in methanol, 0.034 in cyclohexane, and 0.013 in water. The singlet excited state energy was ca. 96 kcal mol(-1) in all solvents. The phosphorescence spectrum of 1 in ethanol at 77 K displayed a maximum at 450 nm, leading to a triplet energy of 75 kcal mol(-1). Experimental excited state energies agree well with the results of OFT calculations at the time-dependent B3LYP/6-311+G(d,p)//B3LYP/6-31G(d) level. Laser flash photolysis (LFP) of 1 at 266 nm led to transients absorbing in the 300-700 nm range, ascribed to radical cat…
Hydrogen peroxide as a biodegradation stimulator in remediation processes of soils heavily contaminated with petrochemicals
2015
Abstract The soil contaminated with petroleum products must be excluded from the crops and treated to reclamation processes. Natural processes of decomposition of hydrocarbon compounds go very slow, so it is necessary to use bioaugumentation or stimulation in order to accelerate the return of the soil to high culture. In this study the effect of hydrogen peroxide on the process of cleaning soil strongly contaminated with pertochemicals was investigated. For this purpose, a pot experiment lasting 60 days was carried. The dynamics of changes in the population of filamentous fungi, yeasts and bacteria were examined and also content of aliphatic hydrocarbons (n-alkanes), monoaromatic and polycy…
Photo-Electrochemical Technologies for Removing Organic Compounds in Wastewater
2018
Abstract In recent years, electrochemical technologies for the prevention and remediation of environmental pollution have been strongly developed. A review of photoelelectrocatalysis (PEC) for the treatment of wastewater is presented in this chapter. Different types of photo-anodes and cathodes have been developed and studied to increase the efficiency of PEC for the removal of organic compounds. An interesting parameter that was investigated in the last work is the generation of an active species by the utilization of proper cathodes. Moreover, this chapter deals with the keys factors affecting the PEC, including electrolyte oxidation.
Assessing impacts of soil management measures on ecosystem services
2018
Only a few studies have quantified and measured ecosystem services (ES) specifically related to soil. To address this gap, we have developed and applied a methodology to assess changes in ecosystem services, based on measured or estimated soil property changes that were stimulated by soil management measures (e.g., mulching, terracing, no-till). We applied the ES assessment methodology in 16 case study sites across Europe representing a high diversity of soil threats and land use systems. Various prevention and remediation measures were trialled, and the changes in manageable soil and other natural capital properties were measured and quantified. An Excel tool facilitated data collection, c…
Structural, energetic and kinetic database of catalytic reactions: Benzyl alcohol to benzaldehyde oxidation on MnOx clusters
2021
Abstract Data here reported are connected with the research article “Benzyl Alcohol to Benzaldehyde Oxidation on MnO x Clusters: Unraveling Atomistic Features” Gueci et al. [1] . This work described and discussed structural and energetic results, calculated by Density Functional Theory (DFT). In order to get kinetic information, DFT results were refined by an original approach, which will be shortly described in the following article. The crossed analysis of experimental and computational energetic and kinetic data allowed to (i) reconstruct the complicated lattice that connects the primary and secondary mechanisms of the reaction and (ii) identify alternative process pathways capable of by…
Stymulacja rozkładu substancji ropopochodnych w skażonej glebie z wykorzystaniem nadtlenku wodoru i szczepionki Yarrowia lipolytica A101
2016
Skażenia substancjami ropopochodnymi stanowią ogromny problem, nie tylko w rolnictwie, ponieważ negatywnie wpływają na właściwości fizyko-chemiczne i aktywność biologiczną gleb. Związki te mogą się również akumulować w roślinach lub wraz z pyłem osiadać na ich zielonych częściach. Większość z nich to substancje karcenogenne, dlatego ich usuwanie ze środowiska wymaga zastosowania efektywnych, tanich i bezpiecznych metod. W warunkach laboratoryjnych oceniono przydatność łącznego wykorzystania techniki stymulacji nadtlenkiem wodoru i bioaugmentacji szczepionką drożdżową Yarrowia lipolytica A101 do oczyszczania gleby z substancji ropopochodnych oraz wpływ na dynamikę zmian mikrobioty gleby. Wyk…
Pretreatment of trace element-enriched biomasses grown on phytomanaged soils for bioethanol production
2017
Abstract Phytotechnologies are a set of sustainable, ecological options notably for alleviating pollutant linkages induced by contaminated soils. However, concerns exist regarding the processing of trace elements (TE)-enriched biomass and the fate of TEs in the end-products. The fractionation of phytoremediation TE-enriched non-woody lignocellulosic (tobacco) and woody (birch, willow) phytoremediation-borne biomasses was studied using ethanol organosolv, soda and dilute acid pretreatments. TE distribution in the process fractions (pulp, liquid effluents and lignin) was further examined. In dilute acid conditions, a wood pretreatment performed at 170 °C in the presence of 2% w/w of sulfuric …
Extraction of copper and iron from soil with siderophores of fluorescent pseudomonads
2009
Due to the application for more than 100 years of copper to French vineyards to combat fungal diseases of vines copper levels have been reported in vineyard soils up to several hundred milligrams of copper/kg of soil. There are now concerns about the ecotoxicity effects of copper accumulation. One potential way to remediate copper accumulation is phytoextraction. Furthermore, there may be potential to enhance the phytoextraction process by augmenting the process using beneficial bacterial species. Our research has involved investigating the potential to use fluorescent pseudomonads, a key group of bacteria that produce siderophores (iron-scavenging compounds), to enhance phytoextraction of …
“Promenade along the coast: Paul Nash and Dave McKean revisit Dymchurch”
2019
This paper examines the specificity of the coastline as a natural, cultural and medial boundary and interface. It focuses on how the motif of the coastline is depicted and remediated in the works of English artists Paul Nash and Dave McKean: between 1919 and 1925, as he was coming to terms with the aftermath of the First World War, Nash created a series of pictures depicting Dymchurch on the coast of Kent in England; McKean’s 2016 commemorative graphic novel Black Dog: The Dreams of Paul Nash is a biographical exploration of Nash’s youth, of his experience of the war and of his recovery in the immediate post-war period. The interplay between memories of the trenches and the landscape of the…
Evaluation of a public policy for combating exclusions : the case of an "insertion" class in the final year of junior secondary school
2005
Since 1975, the expression "single college" is regularly evoked to describe the first cycle of secondary education in France. However, since 1992, classes named "third of insertion", neither dedicated to general education, nor assimilable to those with adapted teaching have been functioning for mailing pupils. At the cross-roads of political, historical, economic and social problems, this study tries to articulate each one of these fields, with the student body, placed at the centre of these questions, being both from an underprivileged social category and having experienced school failure. The analysis which follows demands simultaneously research on the concept of "insertion", the name of…