scholarly journals Evaluation of cyanide and heavy metals removal in liquid effluents from small mining’s gold benefit, by adsorption with activated carbon and hydrogen peroxide in Segovia, Antioquia

DYNA ◽  
2020 ◽  
Vol 87 (212) ◽  
pp. 9-17
Author(s):  
Claudia Catalina Estrada-Montoya ◽  
Gloria Maria Restrepo Franco ◽  
Narmer Fernando Galeano Vanegas
Keyword(s):  
Heavy Metals ◽  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Gold Mining ◽  
Environmental Problem ◽  
Flow Chart ◽  
Toxic Substances ◽  
Adsorption Efficiency ◽  
Metals Removal ◽  
Lead Zinc

The small gold mining generates toxic substances discharges, being an environmental problem. The objective was to evaluate the removal of cyanide and heavy metals, in liquid effluents from the gold benefit, by adsorption with activated carbon and hydrogen peroxide. The residues were first treated with carbon to determine the adsorption efficiency with 20, 40, 60 g of carbon / L of solution at times of 4, 8, 12 hours. Then hydrogen peroxide (1.0, 1.5, 2.0 liters of peroxide / Kg CN in solution, was added over 4 hours). The response variables were concentrations of cyanide, lead, zinc, iron. The best treatment with carbon was 60 g of carbon / L of solution and 12 hours of contact and for the process with hydrogen peroxide: 2 liters of H2O2 / Kg of CN in solution, during 4 hours. A flow chart and tables for the implementation of the process were designed.

scholarly journals Heavy Metals Removal Using Activated Carbon, Silica and Silica Activated Carbon Composite

2014 ◽  
Vol 50 ◽  
pp. 113-120 ◽  
Author(s):  
Mona Karnib ◽  
Ahmad Kabbani ◽  
Hanafy Holail ◽  
Zakia Olama
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Carbon Composite ◽  
Heavy Metals Removal ◽  
Metals Removal

scholarly journals Cu adsorption in fixed bed column with three different influent concentration

2019 ◽  
Vol 120 ◽  
pp. 03003
Author(s):  
Huang-Mu Lo ◽  
Kae-Long Lin ◽  
Min-Hsin Liu ◽  
Hsung-Ying Chiu ◽  
Fang-Cheng Lo
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Activated Carbon ◽  
Fixed Bed ◽  
Thomas Model ◽  
Fixed Bed Column ◽  
Nelson Model ◽  
Influent Concentration ◽  
Carbon Adsorption ◽  
Metals Removal

Heavy metals from the electroplating wastewater might cause environmental pollution if not well treated. Generally, carbon adsorption might be used for the final step for further trace metals removal. This study investigated the heavy metal Cu adsorption in the fixed bed column with 1, 10 and 100 mg/L influent concentration. Results showed that KAB decreased as influent Cu concentration increased from 1 to 100 mg/L while N0 increased as influent concentration increased from 1 to 100 mg/L as can be found in Adams-Bohart model. R2 was found between 0.8579 and 0.9182. In Thomas model. KTH and q0 showed the similar trend as KAB and N0 in the Adams-Bohart model. KTH decreased as influent Cu concentration increased from 1 to 100 mg/L. q0 increased as influent Cu concentration increased from 1 to 100 mg/L. R2 of regression model was found between 0.9065 and 0.9836. In Yoon-Nelson model. KYN increased as influent Cu concentration increased from 1 to 100 mg/L while τ decreased as influent Cu concentration increased from 1 to 100 mg/L. Results showed that the three models of Adams-Bohart model, Thmoas model and The Yoon-Nelson model were suitable for the description of Cu adsorption by activated carbon.

scholarly journals Adsorption of Heavy Metals from Industrial Wastewater using Nanoparticles from Agro Wastes

2021 ◽  
Author(s):  
Lekan Taofeek Popoola ◽  
Alhaji Shehu Grema
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Industrial Wastewater ◽  
Activated Carbons ◽  
Textural Properties ◽  
Isotherm Models ◽  
Heavy Metals Removal ◽  
Adsorption Mechanisms ◽  
Body Tissues ◽  
Metals Removal

Effluents from essential industries have been characterized with heavy metals which are non-biodegradable in nature and also detrimental to health when accumulated in body tissues over long exposure. Adsorption was proved as the best efficient process amongst others to remove these heavy metals from industrial wastewater due to its excellent features. Activated carbons from nanoparticles of agricultural wastes such as pods, shells, husks, peels, shafts and many prepared via calcination process at high temperature can be used as active adsorbent for the industrial wastewater treatment involving heavy metals removal. This chapter discusses heavy metals in industrial wastewater effluents and potential agro wastes from which nanoparticles of activated carbon for industrial wastewater purification could be generated. The transformation of agro wastes nanoparticles into activated carbons via calcination and their applications for heavy metals removal from industrial wastewater via adsorption were examined. Various characterization techniques to study the effects of calcination on structural, morphological and textural properties of activated carbon prepared from agro waste nanoparticles were also discussed. Various isotherm, kinetics, mechanistic and thermodynamics models to investigate the adsorptive nature of the process were presented. Error functions and algorithms for both the linear and non-linear isotherm models regression to affirm their fitness for prediction were presented. Lastly, proposed adsorption mechanisms of heavy metals removal from industrial wastewater using activated carbons from nanoparticles of agro wastes were presented.

Enhanced heavy metals removal without phosphorus loss from anaerobically digested sewage sludge

2008 ◽  
Vol 58 (1) ◽  
pp. 201-206 ◽  
Author(s):  
A. Ito ◽  
K. Takahashi ◽  
J. Aizawa ◽  
T. Umita
Keyword(s):  
Heavy Metals ◽  
Hydrogen Peroxide ◽  
Sewage Sludge ◽  
Ferric Hydroxide ◽  
Ferric Sulphate ◽  
Combined Process ◽  
Phosphorus Loss ◽  
Heavy Metals Removal ◽  
Metals Removal ◽  
Digested Sewage Sludge

Heavy metals removal without phosphorus loss from anaerobically digested sewage sludge was investigated by conducting batch experiments using hydrogen peroxide and/or iron sulphate under acidified conditions at pH 3. The addition of hydrogen peroxide to the sludge improved the elution efficiencies of As, Cd, Cu and Zn with phosphorus loss from the sludge. The optimum initial concentrations of hydrogen peroxide were. Respectively. 0.1% for As, Cd, Mn and Zn and 0.5% for Cu and Ni. The combined process of 0.1% hydrogen peroxide and 1 g Fe/L ferric sulphate enhanced the initial elution rate of Cu and Cr compared to the addition of either ferric sulphate or hydrogen peroxide, indicating that oxidants stronger than hydrogen peroxide were produced in the sludge. Furthermore, the combined process immobilised phosphorus in the sludge due to co-precipitation with ferric hydroxide or precipitation as ferric phosphate. It was concluded that there is a possibility that the combined process could remove heavy metals effectively without phosphorus loss from anaerobically digested sewage sludge.

scholarly journals Heavy metals removal by thiol modified oak charcoal: Adsorption efficiency and selectivity

2021 ◽  
Vol 10 (3) ◽  
pp. 227
Author(s):  
Zeinab Ezzeddine ◽  
Batoul Solh ◽  
Hussein Hamad
Keyword(s):  
Heavy Metals ◽  
Metal Ions ◽  
Adsorption Efficiency ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Capacities ◽  
Metals Removal ◽  
Granulometric Analysis ◽  
Adsorbent Surface ◽  
Removal Of Heavy Metals

<p>Herein, the removal of heavy metals on thiol modified oak charcoal was investigated. The modified charcoal was characterized by X-ray diffraction, granulometric analysis and infrared spectroscopy. Then, its adsorption efficiency for the removal of Cd2+, Cu2+ and Pb2+ from water was tested. The effects of several conditions on metals adsorption were investigated such as contact time, pH, electrolytes and the initial metal ions concentration. The adsorption capacities were high (197, 250 and 214 mg g-1 for Cd2+, Pb2+ and Cu2+ respectively). The selectivity was also dependent on the metal ions nature and the functional group used. The mechanism of adsorption is complex where several types of interaction between metal ions and the adsorbent surface are involved.</p>

Fly Ash-Activated Carbon Powder Composites for Dyes and Heavy Metals Removal

2009 ◽  
Vol 79-82 ◽  
pp. 243-246 ◽  
Author(s):  
Maria Visa ◽  
Luminita Isac ◽  
Anca Duta
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Fly Ash ◽  
Water Discharge ◽  
Single Step ◽  
Carbon Powder ◽  
Methylen Blue ◽  
Metals Removal ◽  
Removal Of Heavy Metals ◽  
Powder Composites

Advanced wastewater treatment requires highly efficient substrates, able to insure in a single step process the water discharge requirements. The paper the results obtained in the simultaneous removal of heavy metals and dyes, using a composite powder of fly ash and activated carbon. The results show that adding a small amount of activated carbon in a powder mixture with modified fly ash is highly effective in removing cadmium from wastewaters also containing dyes (methylen blue or methyl orange). Chemisorption is the likely mechanism governing this process.

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