metals in wastewater Articles
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Aluminosilicate-based adsorbent in equimolar and non-equimolar binary-component heavy metal removal systems
Cadmium (Cd) and lead (Pb) are toxic heavy metals commonly used in various industries. The simultaneous presence of these metals in wastewater amplifies the toxicity of wastewater and the complexity of the treatment process. This study has investigated the selective behavior of an aluminosilicate-based mesoporous adsorbent. It has been demonstrated that when equimolar quantities of the metals ...
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Fe(II) and Fe(III) adsorption by chitosan-tripolyphosphate beads: kinetic and equilibrium studies
The purpose of this research was to analyze the adsorption behavior of Fe(II) and Fe(III) ions in aqueous solution onto beads of naturally derived chitosan cross-linked with tripolyphosphate in a batch system. Effects of solution pH, contact time and amount of adsorbent were regarded in the kinetic and equilibrium studies. The optimum conditions of adsorption for Fe(II) and Fe(III) were ...
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Biosorption of lead (II) and cadmium (II) using
Escherichia coli genetically engineered with mice metallothionein IContamination caused by heavy metals in wastewater has a high potential of risk because they easily penetrate in to the trofic chain accumulating as organometallic compounds. In this work, the expression of mice metallothionein in E. coli (pMt-Thio) was examined as a strategy to enhance metal biosorption efficiency of bacterial biosorbents for Pb(II) and Cd(II) ions. The results showed that ...
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Irrigation of certain Mediterranean plants with heavy metals
The ability of some Mediterranean plant species to absorb heavy metals present in wastewater from treatment plants is researched. Their tolerance to high concentrations of heavy metals is also assessed. Myoporum sp., Nerium oleander and Geranium sp. were irrigated with wastewater, normal irrigation water, and irrigation water enriched with metals. The concentration of metals in the wastewater, ...
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Removal of lead (II) from aqueous solutions using rice straw
Lead (Pb2+) is a heavy metal which is utilized in several industries and can have severe impact on the environment and human health. Research work has been carried out lately on the feasibility of using various low cost materials in the removal of heavy metals from wastewater. In this study, the feasibility of utilizing raw rice straw for removal of Pb2+ from water through biosorption was ...
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Optimisation of cell surface and structural components for improving adsorption capacity of Pseudomonas putida 5-x to Cu2+
A heavy metal binding bacterium Pseudomonas putida 5-x was used as biosorbent for heavy metal removal from wastewater. In order to compete with physical adsorbent, the optimisation of the cell preparation technique for further improving its biosorption capacity was conducted. Results showed that the compositions of medium for cell culturing, cell growth age and cell pre-treating technique would ...
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Heavy Metals in Wastewater: The Effect of Electrolyte Composition on the Precipitation of Cadmium(II) Using Lime and Magnesia
The effect of effluent composition on the efficiency of hydroxide precipitation of Cd(II), using both lime and magnesia as precipitants, has been modelled by the solubility domain approach in order to provide wastewater effluent treatment limits, and has been experimentally validated. Common anionic species such as Cl−,, SO42−, and CO32−, have been treated. Solubility domain ...
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Adsorption of heavy metal ions by natural and synthesised zeolites for wastewater treatment
The removal of heavy metal ions, Pb(II) and Cu(II), by adsorption using natural zeolite (NZ), synthesised zeolite (MCM-22) (SZ), and powdered activated carbon (PAC), were examined and compared. The influences of contact time, solution pH and adsorbate concentration have been tested in kinetic runs. The equilibrium sorption capacities of copper and lead ions on NZ, SZ and PAC were found to be ...
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A two-step approach for copper and nickel extracting and recovering by emulsion liquid membrane
The recycling of copper and nickel from metallurgical wastewater using emulsion liquid membrane (ELM) was studied. P507 (2-ethylhexyl phosphonic acid-2-ethylhexyl ester) and TBP (tributyl phosphate) were used as carriers for the extraction of copper and nickel by ELMs, respectively. The influence of four emulsion composition variables, namely, the internal phase volume fraction (ϕ), ...
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Evaluation of biofilm performance as a protective barrier against biocorrosion using an enzyme electrode
Sulfide is known to be an important factor in microbiologically influenced corrosion (MIC) of metals and concrete deterioration in wastewater treatment structures and sewer pipelines. A sulfide biosensor was used to determine the effectiveness of Escherichia coli DH5α biofilm as a protective barrier against MIC. The biofilm was shown to be effective in protecting surfaces from sulfide and helping ...
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KPDES Permit Compliance: Metals in Wastewater Effluent at Fort Knox
ABSTRACT Prior to constructing a new FOTW, Fort Knox had a history of exceeding KPDES effluent limitations for ammonia and BOD. The new 6 MGD FOTW solved the problem, but metals exceedances became an issue. The exceedances could be linked to several factors: low water-quality based effluent limitations (WQBELs) on the new KPDES permit, high background concentrations of some metals, and high ...
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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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Recovery of Cu(II) by chemical reduction using sodium dithionite: effect of pH and ligands
Wastewaters containing Cu(II) and ligands are ubiquitous in various industrial sectors, and efficacy of copper removal processes, especially precipitation, is greatly compromised by ligands. Chemical reduction, being commonly employed for production of metal nanoparticles, is also effective for metal removal. Adjustment of pH and addition of ligands are important to control the particle size ...
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Removing Heavy Metal Contamination in Wastewater Using Clinoptilolite Zeolite
Research shows that natural zeolite can remove trace heavy metals from the wastewater of ink and pigment production, which can mitigate the toxic pollution into waterways. Most inks and dyes used in the printing industry contain trace heavy metals. These elements, when released into the environment during manufacturing, pose severe health risks to humans and wildlife. The heavy metals found in ...
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Chemical speciation of trace metals in the industrial sludge of Dhaka City, Bangladesh
The objective of this study was to assess total concentration and chemical fractionation of trace metals in the industrial wastewater and sludge collected from seven different types of industries in Dhaka City, Bangladesh. The sludge from industries is either dumped on landfills or reused as secondary resources in order to preserve natural resources. Metals were analyzed using inductively ...
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Labile, dissolved and particulate PAHs and trace metals in wastewater: passive sampling, occurrence, partitioning in treatment plants
The occurrence and the partitioning of polycyclic aromatic hydrocarbons (PAHs) and seven metals (Al, Cd, Cr, Cu, Ni, Pb and Zn) were investigated in activated sludge wastewater treatment plants by means of passive and active sampling. Concentrations total dissolved and particulate contaminants were determined in wastewater at several points across the treatment system by means of grab sampling. ...
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Speciation of heavy metals in electroplating industry sludge and wastewater residue using inductively coupled plasma
Abstract: The speciation of metals in environmental samples is a critical factor in assessing the potential environmental impacts, before their disposal. The distribution and speciation of toxic heavy metals in plating wastewater residues and sludge was investigated for four samples using sequential extraction method. Tessier method was used to fractionate the metal content into exchangeable, ...
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Toxicity assessment of free form of heavy metals in aqueous media on earthworm
Eudrillus eugeniae Metals are found in free and also in combined forms. In order to get information on the effect of free forms of heavy metals on earthworms the aqueous extracts of metals were tested on earthworms both in individual form and also in combined form. Different concentrations, i.e. 1 ppm, 5 ppm, and 10 ppm, were selected arbitrarily and were used in the experiments. Metals like copper, cadmium, ...
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Growth and accumulation of heavy metals in turnip (
Brassica rapa ) irrigated with different concentrations of treated municipal wastewaterThe present study has been carried out by irrigating turnip plants with different concentrations of treated municipal wastewater in order to see the effect on heavy metals accumulation and growth of plants. The turnip plants were watered with normal water and the results compared with results obtained by using treated municipal wastewater. The treatments used were: control (tap water) with 0, ...
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Heavy metal removal from wastewater using various adsorbents: a review
Heavy metals are discharged into water from various industries. They can be toxic or carcinogenic in nature and can cause severe problems for humans and aquatic ecosystems. Thus, the removal of heavy metals from wastewater is a serious problem. The adsorption process is widely used for the removal of heavy metals from wastewater because of its low cost, availability and eco-friendly nature. ...
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