scholarly journals Optimization Modeling of nFe0/Cu-PRB Design for Cr(VI) Removal from Groundwater

2021 ◽  
Vol 12 (5) ◽  
pp. 131-138
Author(s):  
I. Maamoun ◽  
◽  
O. Falyouna ◽  
R. Eljamal ◽  
K. Bensaida ◽  
...  
Keyword(s):  
Industrial Wastewater ◽  
Scaling Up ◽  
Real Field ◽  
Reciprocal Relation ◽  
Health Issues ◽  
Barrier Thickness ◽  
Toxic Heavy Metals ◽  
Response Optimization ◽  
Co Precipitation ◽  
Species Removal

Hexavalent chromium is one of the highly toxic heavy metals which could lead to severe health issues when it is discharged into aquifers as industrial wastewater. In the current study nFe0/Cu was successfully employed in PRB technology for Cr(VI) removal from groundwater. Batch and column experiments confirmed the high reactive performance of nFe0/Cu towards Cr(VI) removal by around 85% removal efficiency. The main pathways for Cr-species removal by nFe0/Cu were determined as the reduction of Cr(VI) to Cr(III) by both nFe0 and Cu0 and the precipitation/co-precipitation of Cr(III) with the released iron oxides on the nFe0/Cu surface. The developed 3D-surface response optimization model confirmed the reciprocal relation between the residence time, barrier thickness and hydraulic conductivity. The interaction and sensitivity analysis between the model’s parameters were significantly crucial for defining the optimal design conditions of the nFe0/Cu-PRB. Generally, the current study could represent a great contribution in scaling-up the PRB technology towards the real field applications.

scholarly journals Application of Nano Bio-clay Composite in a Scaling-up Study for Wastewater Treatment

2021 ◽  
Vol 12 (5) ◽  
pp. 6393-6414
Keyword(s):  
Industrial Wastewater ◽  
Field Experiments ◽  
Ph Value ◽  
Field Tests ◽  
Scaling Up ◽  
Environmentally Benign ◽  
Impregnation Method ◽  
The Novel ◽  
Wastewater Recycling ◽  
Cr Concentration

A scaling-up study integrating experimental and field experiments was managed to explore the most appropriate catalysis method to assist industries in getting rid of the Congo Red (CR) dye from industrial wastewater. The adsorption potential of kaolinite (K) modified by Ulva Lactuca (UL) was evaluated to eliminate CR dye from aqueous solutions. The novel kaolinite/alga nanocomposite (KUL) was synthesized following steps of the wet impregnation method and then subjected to characterization using different techniques. The newly reported KUL nanocomposite shows a significant increase in adsorption ability higher than that of K and UL. To research different experimental factors' effects, batch experiments were evaluated, and each of the kinetics/isotherms of CR adsorption were explored either. The CR removal% is clearly affected by catalyst dose, working temperature, and pH value with high percentage. The best temperature for CR adsorption onto KUL is 400C at pH>7. CR adsorption on KUL following the first-order diffusion model, while K and UL appeared to follow two different kinetic adsorption models depending on the CR concentration. Moreover, the field tests (scaling-up experiments) revealed optimistic results with 91% efficiency for KUL nano-adsorbents in eliminating mixed dyes from industrial wastewater, which means the foundation of novel environmentally benign nano-adsorbents to help in industrial wastewater recycling.

Co-precipitation of Ni, Cr, Mn, Pb and Zn in industrial wastewater and sediment samples with copper(II) cyclo-hexylmethyldithiocarbamate for their flame atomic absorption spectrometric determination

2012 ◽  
Vol 66 (1) ◽  
pp. 105-112 ◽  
Author(s):  
Ayodele Rotimi Ipeaiyeda ◽  
Adekunle Johnson Odola
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Industrial Wastewater ◽  
Atomic Absorption Spectrophotometry ◽  
Sample Volume ◽  
Sediment Samples ◽  
Flame Atomic Absorption ◽  
Precipitation Procedure ◽  
Co Precipitation

A co-precipitation technique for nickel(II), chromium(II), manganese(II), lead(II) and zinc(II) with the aid of copper(II) cyclo-hexylmethyldithiocarbamate was established. The influences of some analytical parameters such as pH, sample volume, amounts of cyclo-hexylmethyldithiocarbamate and copper(II) on the recovery of metal ions were investigated. The heavy metals in the precipitate were determined by flame atomic absorption spectrophotometry. The range of detection limits for the heavy metals was 0.003–0.005 mg/L. The atomic spectrometric technique with co-precipitation procedure was successfully applied for the determination of Ni, Cr, Mn, Pb and Zn in industrial wastewater and sediment samples from Ladipo stream in Lagos, Nigeria. The mean concentrations for these metals using co-precipitation procedure were not significantly different from corresponding concentrations obtained using spectrometric techniques without co-precipitation procedure.

Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution

2014 ◽  
Vol 70 (6) ◽  
pp. 1004-1010 ◽  
Author(s):  
Th. I. Shalaby ◽  
N. M. Fikrt ◽  
M. M. Mohamed ◽  
M. F. El Kady
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Transmission Electron ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

scholarly journals Bioremediation of Toxic Heavy Metals Cr (VI) from Tannery Effluent using Micro-Organisms: Biotechnological Potential

2018 ◽  
Vol 4 (01) ◽  
pp. 41-48
Author(s):  
Madhu Prakash Srivastava ◽  
Nupur Srivastava ◽  
Neeta Sharma ◽  
Yogesh Kumar Sharma
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Agricultural Land ◽  
Extracellular Proteins ◽  
Tannery Effluent ◽  
Toxic Heavy Metals ◽  
Biotechnological Potential ◽  
Removal Of Heavy Metals ◽  
Heavy Metals Pollution ◽  
Micro Organisms

Increased industrialization and human activities have impacted on the environment through disposal waste containing heavy metals. Heavy metals pollution of agricultural soil has been mainly due to the disposal of industrial wastewater, sewage and sewage sludge to agricultural land. Conventional methods for the removal of heavy metals from aqueous solutions are not economically and environmental friendly because it has produced massive quantity of toxic chemical compounds. Naturally fungi have a large variety of extracellular proteins, organic acids and other metabolites. Fungi can adapt in any ecosystems and any environmental conditions Interest in processes involving heavy metal uptake by microorganisms has increased considerably in recent years due to the biotechnological potential of micro-organisms in removing and/or recovery of metals.

scholarly journals Synthesis and Characterization of Iron Oxide Nanoparticles and Applications in the Removal of Heavy Metals from Industrial Wastewater

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Zuolian Cheng ◽  
Annie Lai Kuan Tan ◽  
Yong Tao ◽  
Dan Shan ◽  
Kok Eng Ting ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Maghemite Nanoparticles ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Solution Ph ◽  
X Ray ◽  
Adsorption Data ◽  
Removal Of Heavy Metals

This study investigated the applicability of maghemite (γ-Fe2O3) nanoparticles for the selective removal of toxic heavy metals from electroplating wastewater. The maghemite nanoparticles of 60 nm were synthesized using a coprecipitation method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDX). Batch experiments were carried out for the removal of Pb2+ions from aqueous solutions by maghemite nanoparticles. The effects of contact time, initial concentration of Pb2+ions, solution pH, and salinity on the amount of Pb2+removed were investigated. The adsorption process was found to be highly pH dependent, which made the nanoparticles selectively adsorb this metal from wastewater. The adsorption of Pb2+reached equilibrium rapidly within 15 min and the adsorption data were well fitted with the Langmuir isotherm.

Advanced Materials with Photocatalytic Properties and Magnetic Core for Environmental Applications

2015 ◽  
Vol 1114 ◽  
pp. 81-85 ◽  
Author(s):  
Andra Predescu ◽  
Ecaterina Matei ◽  
Andrei Predescu ◽  
Cristian Predescu ◽  
Cristina Covaliu ◽  
...  
Keyword(s):  
Industrial Wastewater ◽  
High Efficiency ◽  
Sol Gel ◽  
Magnetic Core ◽  
Advanced Materials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Ferrous Chloride ◽  
Co Precipitation

The paper had as purpose the fabrication and characterization of magnetic nanoparticles covered with TiO2 for applications in environmental field. The research consisted in investigating the properties of magnetic iron nanooxides, synthesized from ferric and ferrous chloride and then covered with TiO2, with minimum costs and high efficiency in industrial wastewater treatment. The iron nanoparticles were obtained by co-precipitation method and the titan dioxide was obtained by sol-gel method. After covering the nanoparticles with TiO2, the samples were characterized by X-Ray diffraction (XRD) and scanning electron microscopy (SEM).

Removing Lead from Iranian Industrial Wastewater

2016 ◽  
Vol 57 ◽  
pp. 79-88
Author(s):  
Bita Karim Salmani ◽  
Mohammad Ali Amoozegar ◽  
Hamid Babavalian ◽  
Hamid Tebyanian ◽  
Fatemeh Shakeri
Keyword(s):  
Industrial Wastewater ◽  
Removal Rate ◽  
Industrial Processes ◽  
Toxic Heavy Metals ◽  
Biosorption Capacity ◽  
Batch System ◽  
High Level ◽  
The Impact ◽  
Physiological And Biochemical ◽  
Pretreated Biomass

Metals and chemicals have been increased in industrial processes which they contain a high level of toxic heavy metals and cause a lot of disadvantages for the environment and human health .Biosorption of Pb (П) ions has been studied from aqueous solutions in a batch system by using a bacterial strain isolated from petrochemical wastewaters. Strain 8-I was selected to study the impact of different factors on removal rate. According to morphological, physiological and biochemical characterizations of the strain and in comparison with other studies the strain was tentatively identified as Bacillus sp strain8-I. The maximum Lead biosorption capacity of 8-I isolate was determined to be 41.58 % at pH 4.0 with 80 mg/l concentration in 48 hours equilibrium time. The comparison between the biosorption capacity of live (45.50 mg/g), heat inactivated (30.23 mg/g) and NaN3 pretreated biomass (26.86 mg/g) were indicated that the ability of live biomass for both of active and passive uptake of lead.

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