heavy metals treatment Articles
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Biosorption kinetics and isotherms of copper (II) ions from aqueous solution and application of the MATLAB
In this study, biosorption kinetic and isotherm models were examined by the MATLAB for removal of copper ions from aqueous solution freely dead single Rhizopus arhizus and mixed dead waste sludge biomass. The copper ions removal efficiencies at equilibrium were 98%, 95% and 92% for freely dead R.arrhizus and two types of dead waste sludge. The experimental data fitted to pseudo-second order ...
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4 Benefits of Electrocoagulation for Heavy Metal Wastewater Treatment
There is much debate in academia, as to what elements should be considered “heavy metals”. Some criteria depend on density, some on atomic number, and some on chemical behavior. In the water treatment industry, we tend to concern ourselves with the more common and more toxic variety. Such heavy metals may include mercury, cadmium, lead, chromium, and copper. Arsenic is also ...
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Retention of heavy metals by stormwater filtration systems: breakthrough analysis
Biofiltration systems are widely used to mitigate the impacts of stormwater on receiving waters, however their long-term capacity to retain heavy metals has not previously been assessed. Accelerated-dosing laboratory experiments were used to assess the likelihood of breakthrough occurring for three different types of soil-based filter media that are commonly used in stormwater biofilters. In all ...
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Removal of Ni2+ from aqueous solution by rice bran
Rice bran, an agricultural by-product, was used for the sorptive removal of Ni2+ from aqueous solutions. Batch adsorption experiments were performed as a function of initial concentrations, contact time, pH and temperature. The experimental data were analysed by Langmuir, Freundlich and Redlich-Peterson isotherms. The equilibrium sorption capacity of Ni2+ was determined from the Langmuir equation ...
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Interactions of Pb(II), Cd(II) and Cr(VI) with Neem (Azadirachta indica) leaf powder: kinetics and thermodynamics
Neem leaf powder (NLP) is made from the leaves of the Neem tree (Azadirachta indica) for removing Pb(II), Cd(II) and Cr(VI) from water. The powder (surface area 21.45 m²/g), was used at pH ∼7.0 and pseudo first and second orders, Elovich equation, intra-particle and liquid film diffusion models were used to test the kinetics. The interactions mostly followed a second-order model involving ...
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Biosorption of lead(II) by free and immobilised fungal biomass of Phanerochaete chrysosporium: a comparative study
An efficient metal biosorbent was developed by immobilising fungal biomass within matrix of loofa sponge (FBILS). At biosorption equilibrium FBILS removed 137 mg Pb(II) g-1, which was 24.3% greater than 110 mg Pb(II) g−1 free fungal biomass. The equilibrium biosorption data fitted well the Langmuir model. The experimental data, when applied to the pseudo-first and second-order kinetic models, ...
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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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Removal of COD, colour and heavy metal from wastewater using electro–chemical technique
The effects of applied electric charge (0–200 Amp–min) and pH on the removal of colour and COD from textile wastewater have been analysed. Mild steel plates have been used as electrodes in both parallel and series connections. For colour and COD removal, four electrodes each with a surface area of 177.3 cm² and with inter–electrode distance of 2.3 cm in parallel connection ...
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Imprinted polymers for the removal of heavy metal ions from water
In wastewater treatment, the removal of heavy metals is difficult due to the limited affinity of heavy metal ions to ion exchange resins. Here imprinting polymerization is used to develop resins with high capacity and selectivity for heavy metal ions for water treatment. A random copolymer of methacrylate and methacrylamide was found to be most effective for the removal of hydrophilic metal ...
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Biosorption of chromium(VI), nickel(II) and Remazol Blue by
Rhodotorula muciloginosa biomassThe passive removal of commonly used reactive dye and two heavy metals, from aqueous solutions by inexpensive biomaterial, yeast Rhodotorula muciloginosa biomass, termed biosorption, was studied with respect to pH, initial dye concentration and initial metal ion concentration. The biomass exhibited maximum dye and chromium(VI) uptake at pH 5 and pH 6 for nickel(II) in media containing 50 mg/L ...
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Carboxylic acids-modified palm stones as sorbents for metal ions using single and multi-metal aqueous solutions
Natural palm stone has been modified in order to enhance its sorption capacity for different metal ions. The palm stone (PS), or date-pits, was treated with different carboxylic acids, namely carboxylic acid (CA), tartaric acid (TA), salicylic acid (SA), oxalic acid (OA), mandelic acid (MND) and malic acid (MA). Batch sorption tests were carried out using single, binary or tertiary metal systems ...
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Copper-spent activated carbon as a heterogeneous peroxydisulfate catalyst for the degradation of Acid Orange 7 in an electrochemical reactor
The exhausted activated carbon generated from the adsorption of heavy metal wastewater needs further treatment/disposal. In this study, a new application of copper-spent activated carbon (Cu-AC) was proposed. Cu-AC was used to activate peroxydisulfate (PDS) for the decolorization of Acid Orange 7 (AO7) and electrical current was introduced to enhance the process. The decolorization followed a ...
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Removal of Ni(II) from electroplating rinse waters using cation-exchange resins: batch and column studies
The adsorption of Ni (II) from nickel electro plating rinse water has been attempted. Indion 225 and Dueolite C 20 cation-exchange resins through batch and column mode for the recovery of Ni (II), which showed a remarkable increase in sorption capacity. On the basis of isotherm analysis, more efficient adsorbent is chosen for column mode adsorption studies. The continuous-flow study was to ...
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Heavy metals removal from water by adsorption on propylthiol-functionalised mesoporous silica obtained by co-condensation
Propylthiol-functionalised mesoporous silica SBA-15 prepared by co-condensation has been tested for heavy metal removal. Adsorption from aqueous solution was examined for Cu(II), Pb(II), Cd(II), and Hg(II). Adsorption isotherms were determined at 20°C and Langmuir and Freundlich models were fitted to experimental data. The results from adsorption experiments indicate that mercury is efficiently ...
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Use of aquatic plants in removing heavy metals from wastewater
Phytotechnologies involving use of plants for pollutant removal gained importance during the last two decades. Terrestrial and aquatic plants possess high metal sorption capacity, and hence find their use as inexpensive materials for removing metals from environment. Aquatic biomass irrespective living or dead, exhibits capacity to remove heavy metals from wastewater. The sequestration of heavy ...
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Waste water treatment costs reduced by 50% with rotary vacuum precoat filter - Case Study
Problem: The solids separation system at Lindc's waste water treatment facility had high operating, maintenance and sludge disposal costs. High operating costs were caused by the large pumps and special treatment chemical required to operate the filter, and frequent cleaning, repair and replacement of filter elements resulted in high maintenance costs. Union Carbide Corporation's Linde Division ...
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Evaporation stills fear of chelates and heavy metals - Reliable treatment of rinsing water from zinc
Zinc nickel plating is the state of the art corrosion protection method for stainless steel. In the automotive industry as well as in the mining and in the production of windmills it replaces old processes like alkaline zinc plating for instance. The electrolytes used in zinc nickelplating contain highly concentrated chelating agents. This makes treatment of such industrial wastewater ...
By H2O GmbH
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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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In-Situ Remediation of Heavy Metals Using Sulfur-Based Treatment Technologies
The Metal Problem Highly toxic and highly soluble metals are contained in numerous waste streams including those from power, chemical, electronics facilities, general manufacturing plants, and mining facilities. Lead, chromium, arsenic, zinc, cadmium, copper, and mercury are the most common metal contaminants found on remediation project sites (US EPA, October, 2000). Cyanide is a common ...
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Upgrading of decentralized ponds for municipal wastewater treatment and restricted reuse
Upgrading of a pond system for municipal wastewater treatment in a decentralized area is evaluated. The pond was constructed for the treatment of 63 m3/d. Currently it receives 83 m3/d, therefore poor treatment efficiency was recorded. An expansion of 1.6 times the present land area was required. In addition to construction, operation and maintenance were required to meet the permissible limits. ...
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