toxic metals removal Articles
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Removal of ionic metals from wastewaters of COD determinations
Chemical Oxygen Demand (COD) determinations generate highly disruptive waste streams with chromium, mercury and silver. These should follow specific waste management approaches in search of environmental and economical benefits, for which this work reports simple chemical procedures allowing toxic metal removal. Chromium(VI) is reduced to chromium(III) and total chromium is precipitated with ...
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Cadmium ion removal by electroflotation onto sewage sludge biomass
Non–living, anaerobically digested, Activated–Sludge (AS) was examined (laboratory–scale experiments) as possible biosorbent for the removal of cadmium from dilute aqueous solutions. The application of electroflotation to the suspended biomass, was investigated in this paper as an effective solid/liquid separation technique for the metal–loaded biosorbent particles. The main parameters ...
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Metal ions biosorption from dilute aqueous solution
Biosorption, using non-living biomass (mostly suspended), is briefly reviewed in this paper as applied to toxic metal ions removal, with particular focus on the kinetics and engineering considerations of the process. Several diverse kinetic models were successful in fitting the experimental data. Evidence was provided that the metal biosorption (on Aeromonas caviae biomass) is a complex process. ...
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Zeolite modified with copper oxide and iron oxide for lead and arsenic adsorption from aqueous solutions
How to completely remove toxic metals from water is still a serious challenge, and is the mission that faces researchers and scientists today. In this work, zeolite/copper oxide (CuO) and zeolite/iron oxide (Fe3O4) nanocomposites (NCs) were prepared via a co-precipitation method. Several techniques were used for characterization of the prepared NCs including UV-visible, powder X-ray ...
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Use of various agricultural wastes for the removal of heavy metal ions
There is a need to develop innovative and alternative technologies that can remove toxic heavy metal pollutants from wastewater. In this study, two agricultural residues, cotton stalks and apricot seeds, were used to adsorb copper and lead in solutions. Sorption capacities of agricultural wastes were significantly affected by solution pH, adsorbent mass and adsorbent particle size. The adsorption ...
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Activated Alumina: The Superior Solution for Environmental Cleanup, Pharmaceutical Purification and Clean Energy Applications
Possessing a broad spectrum of useful chemical and biological properties, activated alumina is the superior adsorbent or desiccant for chromatography, separation sciences, purification and many other applications using adsorbents and desiccants. Thanks to DAI's 'highest quality and consistency in the industry' alumina, and its development of specialized and customized alumina targeted to specific ...
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Removal of lead(II) and nickel(II) ions from aqueous solution via Bermuda grass biomass
Adsorption of lead(II) and nickel(II) ions from aqueous solutions was investigated by Bermuda grass biomass. The adsorption process was studied as a function of pH, initial metal concentration, temperature and time. The experimental data obtained were investigated via Langmuir, Freundlich and Temkin isotherms. The kinetic data were examined by pseudo-second-order and intraparticle diffusion ...
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Leaching of heavy metals from wastewater sludge, using a thermostatted column
We have previously patented a process for the extraction of toxic and valuable metals from foundry sands using a thermostatted column. In this paper, we describe a similar device for the removal of toxic metals from wastewater sludge. The wastes were finely ground and suspended in an aqueous pulp, and 10-40g of mineral acid or sodium hydroxide were added to reach a pH of 2, 5, 7 and 10, together ...
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Sugar palm
Arenga pinnata Merr (Magnoliophyta) fruit shell as biomaterial to remove Cr(III), Cr(VI), Cd(II) and Zn(II) from aqueous solutionThe removal of toxic heavy metals Cr(III), Cr(VI), Cd(II) and Zn(II) from aqueous solution by sugar palm (Arenga pinnata) fruit shell has been examined. Adsorption factors consisted of solution of pH, mass of biosorbent as well as initial metal concentration. The Langmuir isotherm was used to study the adsorption mechanism. Moreover, characterization of sugar palm fruit shell was investigated ...
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A review on the use of biopolymers for the removal of toxic metals from liquid industrial effluents
Various industrial processes such as mining, metal plating, metal finishing, and chrome tanning discharge many chemicals and heavy metals into the plant effluent stream. In view of this, the need of developing viable and relevant technologies that can not only cleanup but also recover valuable components from industrial and biological waste streams is of utmost importance. This paper describes ...
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Removal of heavy metals from aqueous solution by limestone
This study focused on the removal of Pb(II), Cd(II), Cu(II), and Zn(II) using reagent solutions by natural limestone in a batch system. The sorbent, collected from the Late Cretaceous limestone beds, Tunisia, was characterised by X–ray diffraction (XRD), chemical analysis (XRF) and infrared spectroscopy (FTIR). XRF showed that the studied limestone contained high amount of calcium carbonates. XRD ...
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Magnetic nanoparticles: study of magnetic heating and adsorption/desorption for biomedical and environmental applications
This paper presents a summary of research on magnetic nanoparticles (MNPs) carried out recently at the Institute of Materials Science. Three families of oxide MNPs namely magnetite, manganite and spinel ferrite materials were prepared by several methods: co-precipitation, sol-gel and high-energy mechanical milling. Magnetite nanoparticles were encapsulated by two natural polymers, starch and ...
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Removal of contaminants from industrial wastewater through various non-conventional technologies: a review
It is difficult to separate industrial growth from environmental pollution but it can be minimised through cost-effective approaches of pollution abatement. To reach the full objectives of zero pollution, adoption of alternative technologies which suit the situation of low capital availability, minimum man-power and limited energy consumption are necessary. Adsorption through agricultural ...
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Pilot-scale demonstration of the hybrid zero-valent iron process for treating flue-gas-desulfurization wastewater: Part II
The hybrid zero-valent-iron (hZVI) process is a novel chemical treatment process that has shown promise for removing heavy metals and nutrients from industrial wastewaters. In this study, a pilot-scale demonstration was conducted to continuously treat 3.8–7.6 L/min (1–2 gpm) of the flue-gas-desulfurization (FGD) wastewater at a coal-fired power plant for 5 months. In this paper, a ...
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Microscopic characteristic of biological iron sulfide composites during the generation process and the association with treatment effect on heavy metal wastewater
Heavy metal pollution is a serious environmental concern worldwide, resulting in both environmental and human harm. Recently, studies have shown that environmental biotechnologies based on sulfate reduction offer a potential for removal of toxic heavy metals. Biological iron sulfide composites are iron sulfide compounds generated in situ by sulfate-reducing bacteria. In this study, microscopic ...
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The binding of metal ions to molecularly-imprinted polymers
Imprinting polymerization is a flexible method to make resins specific for different compounds. Imprinting polymerization involves the polymerization of the resin in the presence of a template, here cadmium ions or arsenate. The template is then removed by washing, leaving specific binding sites in the resin. In water treatment, the removal of toxic metal ions is difficult due to the limited ...
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The advantages of advanced oxidation with filtration
Breaking the trend of agricultural appliances with the help of 14 V electricity; a system with high voltage was lately introduced in the farming sector. The government is providing power to engine auxiliaries and other electrically driven systems. It helps to reduce fuel consumption, under the load part conditions. Nowadays, more farmers are encouraged to use the high voltage system. ...
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Application of Wet Electrostatic Precipitation Technology (Wesp) in The Utility Industry for Multiple Pollutant Control Including Mercury
Abstract Wet electrostatic precipitation technology can be used to control acid mists, sub-micron particulate, mercury, metals and dioxins/furans as the final polishing device within a multi-pollutant air pollution control system. Test results from coal –fired installations demonstrate >90% removal efficiencies on PM2.5, SO3, and near zero opacity. Additionally, wet ESP technology ...
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Emergency water treatment solutions: municipalities & government agencies are you prepared
In this article, we will discuss recent natural disasters worldwide, their immediate effects on drinking water availability, and how to strategically deploy and use innovative portable and containerized electrocoagulation units for emergency water treatment to provide your citizens with clean water. Nature is a truly powerful force, one we could never hope to combat, only recover from. ...
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