Search results for "Water remediation"
showing 10 items of 20 documents
Removal of Brilliant Green Dye from Water Using Ficus benghalensis Tree Leaves as an Efficient Biosorbent
2023
The presence of dyes in water stream is a major environmental problem that affects aquatic and human life negatively. Therefore, it is essential to remove dye from wastewater before its discharge into the water bodies. In this study, Banyan (Ficus benghalensis, F. benghalensis) tree leaves, a low-cost biosorbent, were used to remove brilliant green (BG), a cationic dye, from an aqueous solution. Batch model experiments were carried out by varying operational parameters, such as initial concentration of dye solution, contact time, adsorbent dose, and pH of the solution, to obtain optimum conditions for removing BG dye. Under optimum conditions, maximum percent removal of 97.3% and adsorption…
Compatibility of surfactants with activated-persulfate for the selective oxidation of PAH in groundwater remediation
2017
Abstract Surfactants foam technology can improve the in situ remediation of hydrophobic organic contaminants by enhancing their solubility and the delivery of remediation chemicals. However, the presence of surfactants may impair the effectiveness of the selective oxidation of those contaminants. To tackle the issue, kinetics and selectivity of phenanthrene (PHE) oxidation in aqueous suspensions and its affecting factors including surfactant concentration (CS) and nature, temperature and persulfate (PS) concentration were studied. Significant differences in selectivity were observed between surfactants, reflecting Coulomb interactions with the anionic oxidizers. Lauryl Betaine (LB) stood ou…
Bioinspired Metal-Organic Frameworks in Mixed Matrix Membranes for Efficient Static/Dynamic Removal of Mercury from Water
2020
The mercury removal efficiency of a novel metal-organic framework (MOF) derived from the amino acid S-methyl-L-cysteine is presented and the process is characterized by single-crystal X-ray crystallography. A feasibility study is further presented on the performance of this MOF and also that of another MOF derived from the amino acid L-methionine when used as the sorbent in mixed matrix membranes (MMMs). These MOF-based MMMs exhibit high efficiency and selectivity in both static and dynamic regimes in the removal of Hg2+ from aqueous environments, due to the high density of thioalkyl groups decorating MOF channels. Both MMMs are capable to reduce different concentration of the pollutant to …
Biodegradable Membrane with High Porosity and Hollow Structure Obtained via Electrospinning for Oil Spill Clean-up Application
2023
The use of biodegradable polymers for the production of membranes to be used in wastewater treatment has attracted increasing interest considering the possibility of reducing the risk of second pollution. In this work, porous fibrous membranes based on polylactic acid and polyethylene oxide (PEO) blends were prepared. The solutions were electrospun using two approaches: (i) conventional coaxial electrospinning followed by leaching treatment (double-step, DS); (ii) coaxial wet electrospinning with in situ leaching (single-step, SS). By varying PEO type and processing method it was possible to control membranes structure and porosity. DS leaching treatment lead to surface porosity (i.e. shell…
Wastewater Treatments for the Food Industry: Biological Systems
2017
This chapter provides a general overview of biological wastewater remediation systems in the food industry. Water reuse systems are becoming more and more interesting and promising technologies, depending on merely quantitative estimations, physical and chemical features of pollutants and the variability of these characteristics, week after week. Different systems are available for the food industry. Several of these remediation systems may be subdivided into four categories depending on the peculiar removal operation, including biological systems. Biological techniques aim to reduce organic loads and the remaining suspended materials in wastewaters from primary processes (after a prelimina…
Wastewater Treatments for the Food Industry: Physical-Chemical Systems
2017
This chapter provides a general overview of physical–chemical wastewater remediation systems in the food industry. Water reuse systems are becoming more and more interesting and promising technologies, depending on merely quantitative estimations, physical and chemical features of pollutants and the variability of these characteristics, week after week. Different systems are available for the food industry, depending on the final destination or water effluents and peculiar chemical–physical and biological features of the fluids before treatment. Several of these remediation systems can be subdivided into different groups, depending on the desired amount of gross removed matters, or into fou…
Contaminant Mobilization from Polluted Soils: Behavior and Reuse of Leaching Solutions
2020
Soil and water contamination by toxic elements or molecules cause risks of chemical pollutions. These pollutions can heavily affect resources and activities of humans and ecosystems. By nature, the remediation of environmental pollutions is a constraint, because its application is hampered by high costs. Soil and groundwater remediation implements a variety of strategies, technologies, and practices to face the diversity and the complexity of every cases. Contaminant recovery is among the three main strategies implemented for the remediation of contaminated soils, and contaminant separation or mobilization by water is widely used for this purpose. As water solubility is the driving force of…
Metal–organic framework technologies for water remediation: towards a sustainable ecosystem
2018
Having access to clean water is a mandatory requirement for the proper development of living beings. So, addressing the removal of contaminants from aquatic systems should be a priority research topic in order to restore ecosystem balance and secure a more sustainable future. The fascinating structures and striking physical properties of metal–organic frameworks (MOFs) have revealed them as excellent platforms for the removal of harmful species from water. In this review, we have focused our attention on critically highlighting the latest developments achieved in the adsorptive removal of inorganic – metal cations, inorganic acids, oxyanions/cations, nuclear wastes and other inorganic anion…
Photodegradation of Brilliant Green Dye by a Zinc bioMOF and Crystallographic Visualization of Resulting CO2
2021
We present a novel bio-friendly water-stable Zn-based MOF (1), derived from the natural amino acid L-serine, which was able to efficiently photodegrade water solutions of brilliant green dye in only 120 min. The total degradation was followed by UV-Vis spectroscopy and further confirmed by single-crystal X-ray crystallography, revealing the presence of CO2 within its channels. Reusability studies further demonstrate the structural and performance robustness of 1.