lead removal Articles
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Removal of lead from aqueous solutions by complexation ultrafiltration with chitosan
The removal of lead from aqueous dilute solutions by complexation-ultrafiltration with chitosan was studied. Experiments were performed as a function of aqueous pH, chitosan/Pb2+ ratio, and background electrolyte concentration. The value of pH was found to be the most important parameter to effect the lead removal. The lead removal rate reaches the plateau at almost 100% when the chitosan and ...
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Assessment of TiO2 photoactivity on the lead removal: kinetic and mechanistic processing
Removal of lead ions from aqueous solutions, in the presence and in absence of commercial TiO2, under UV-light was studied. The influence of catalyst mass, concentration of Pb(II) ions and of citric acid in the starting solution as well as the impact of illumination conditions on the removal rate were also investigated. The results were fitted on the pseudo-first order, pseudo-second order ...
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Modified crab shell particles for the removal of lead[II] ions from aqueous solutions
The ability of crab shell particles to remove lead[II] was evaluated in a batch reactor and in a fixed–bed column. The binding of lead[II] by crab shell was found to be affected significantly by pH, with maximum sorption capacity 714 mg/g observed at pH 4. The sorption isotherm of lead[II] on crab shell particles was modelled by the application of Langmuir followed by Sips, Redlich–Peterson and ...
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Lead removal efficiency using biosorbents as alternative materials for permeable reactive barriers
As alternative materials for heavy metal removal, this study investigated biosorbents to determine their suitability for permeable reactive barriers. The lead removal efficiencies of brown seaweed (Undaria pinnatifida) and reed (Phragmites australis) were determined under different conditions (batch and column system). The experimental results for these biomaterials fitted the Langmuir isotherm ...
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Sorption of lead ions from aqueous solution onto
Enterococcus faecium biomassThis study reports kinetics and equilibrium of lead sorption onto the biomass of Enterococcus faecium. E. faecium is a lactic acid bacterium and was isolated from meat. Batch experiments were carried out to analyze the effects of the initial lead concentration, initial pH of the medium, agitation time and temperature on the biosorption. The lead sorption was found to increase with the increase ...
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Batch sorption of lead (II) from aqueous solutions using natural kaolinite
The potential to remove lead (II) ions from aqueous solutions using natural kaolinite was investigated. The effects of several parameters including solution pH, adsorbent dose, ionic strength and solution temperature on adsorption were examined. The sorption data followed the Freundlich, Langmuir and Dubinin-Radushkevich isotherms. The adsorption process was spontaneous and endothermic in nature. ...
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Differences in the removal mechanisms of Undaria pinnatifida and Phragmites australis as biomaterials for lead removal
This study offers the opportunity to utilize Undaria pinnatifida and Phragmites australis to remove lead from water in permeable reactive barrier (PRB) technology. Its efficacy was tested using batch experiments and PRB column systems. From the batch experiment results, a higher adsorption capacity was observed for Undaria pinnatifida. Nevertheless, Phragmites australis in the column system ...
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Differences in the removal mechanisms of Undaria pinnatifida and Phragmites australis as biomaterials for lead removal
This study offers the opportunity to utilize Undaria pinnatifida and Phragmites australis to remove lead from water in permeable reactive barrier (PRB) technology. Its efficacy was tested using batch experiments and PRB column systems. From the batch experiment results, a higher adsorption capacity was observed for Undaria pinnatifida. Nevertheless, Phragmites australis in the column system ...
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The modelling of lead removal from water by deep eutectic solvents functionalized CNTs: artificial neural network (ANN) approach
The main challenge in the lead removal simulation is the behaviour of non-linearity relationships between the process parameters. The conventional modelling technique usually deals with this problem by a linear method. The substitute modelling technique is an artificial neural network (ANN) system, and it is selected to reflect the non-linearity in the interaction among the variables in the ...
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Lead, copper, cobalt and nickel removal from water solutions by dynamic ionic exchange in LECA zeolite beds
LECA zeolite, a novel material containing zeolite crystallised on light expanded clay aggregates (LECA) substrates with the aid of a hydrothermal process, was used in ionic exchange applications. LECA zeolite combines the porosity, low density and good mechanical properties of LECA substrates with the microporosity and ion-exchange properties of zeolites. In the present work, the dynamic ionic ...
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Biosorption of Pb(II) from synthetic wastewater onto Pseudomonas aeruginosa
The biosorption property onto Pseudomonas aeruginosa was represented by the Langmuir isotherm, and the maximum capacity of Pb(II) was 45 mg g−1 dry weight of bacteria at pH 5. The biosorption capacity of Pb(II) in a binary system increased with increasing Pb(II) concentration, from 0 to 50 mg l−1 in which Cr(III) existed at a constant concentration of 50 mg l−1. This result indicates that there ...
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UK experience in the monitoring and control of lead in drinking water
At the zonal scale (e.g. a city or town), random daytime (RDT) sampling succeeded in demonstrating both the need for corrective action and the benefits of optimised orthophosphate dosing for plumbosolvency control, despite initial concerns about sampling reproducibility. Stagnation sampling techniques were found to be less successful. Optimised treatment measures to minimise lead in drinking ...
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Effective removal of lead (II) ions by dead calcareous skeletons: sorption performance and influencing factors
Dead calcareous skeletons (CSs) as low-cost adsorbents were studied to remove lead ions (Pb (II)) in an aqueous solution. Factors influencing the efficiency of CSs were evaluated by adsorbent size, contact time, initial concentration, dosage concentration and pH. The optimum CS size for removal of Pb (II) was 710 μm at an equilibrium time of 720 min. The best dosage of CS was 10 g/L for a 99% ...
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Diffusion models for adsorption kinetics of Zn2+ , Cd2+ and Pb2+ onto natural zeolite
The kinetics of zinc, cadmium, and lead ions removal by natural zeolite-clinoptilolite has been investigated using an agitated batch adsorber. Batch experiments at constant temperature have been performed. The influence of agitation speed, initial heavy metals concentration and particle size of the sorbent on the removal efficiency of heavy metals from liquid phase have been studied. A decrease ...
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Microstickies agglomeration by electric field
Microstickies deposits on both paper machine and paper products when it agglomerates under step change in ionic strength, pH, temperature and chemical additives. These stickies increase the down time of the paper mill and decrease the quality of paper. The key property of microstickies is its smaller size, which leads to low removal efficiency and difficulties in measurement. Thus the ...
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Optical Polishing
A mid-western firm who manufactures a large amount of specialty eyeglass lens was having a problem removing lead from their wastewater stream. This stream was a combination of the grinding effluent waster and the wash stream containing cleaning compounds. The normal effluent stream had a pH of 11- 11.5. The sample was treated without pH adjustment with the addition of Floccin-HP. The dosage was ...
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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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Case Study: City of Torrance Pullman Car
This Pullman Train Car, constructed in the early 1940’s, had deteriorated for years at a municipal storage lot. Ellis administered the removal of lead-based paint and asbestos panels in a way that allowed complete restoration of this local ...
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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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Cadmium and lead removal from municipal landfill leachate using carbon adsorbent made from oil palm shell
This paper focused on adsorption process for metals removal from landfill leachate using oil palm shell as adsorbent. Raw shells were grinded to sizes of about 2 mm, followed by heating in at 420°C for a period of 4 hours. Batch test indicated a removal of more than 60% Cd and Pb from leachate samples. The removal process agrees with the Freundlich isotherm model. Column test for continuous flow ...
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