scholarly journals Removal of selected pesticides by adsorption

2013 ◽  
Vol 6 (1) ◽  
pp. 25-28 ◽  
Author(s):  
Mária Valičková ◽  
Ján Derco ◽  
Katarína Šimovičová
Keyword(s):  
Activated Carbon ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Contact Time ◽  
Granular Activated Carbon ◽  
Hazardous Substances ◽  
Adsorption Efficiency ◽  
Chlorinated Pesticides

Abstract The paper is focused on the removal of selected priority hazardous substances. Five chlorinated pesticides, i.e. hexachlorobenzene (HCHB), hexachlorobutadiene (HCHBD), lindane (LIN), pentachlorobenzene (PCHB) and heptachlor (HCH) were selected as model pollutants. Higher volatility is characteristic for these substances. Adsorption of these pollutants on granular activated carbon (GAC), zeolite (Zeo) and activated sludge (AS) was investigated. The effect of contact time on the removal efficiency of studied substances was investigated. From results of the work it follows that the highest removal efficiency of studied substances was achieved by the adsorption on activated sludge. This was followed by adsorption efficiency on zeolite. The lowest removal efficiency was measured for adsorption on granular activated carbon.

scholarly journals Use of Immobilized Enzyme In Granular Activated Carbon And Chitosan Beads For Phenol Removal From Effluents

2021 ◽  
Author(s):  
Ana Carina Cruz de Mello ◽  
Felipe Pereira da Silva ◽  
Andrea Medeiros Salgado ◽  
Fabiana Valéria da Fonseca
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Contact Time ◽  
Immobilized Enzyme ◽  
Granular Activated Carbon ◽  
Immobilized Enzymes ◽  
Enzymatic Oxidation ◽  
Phenol Removal ◽  
Chitosan Beads ◽  
Tyrosinase Enzyme

Abstract Tyrosinase enzyme present in a crude extract was immobilized in granular activated carbon (GAC) and activated chitosan beads (ACB). It was possible to immobilize up to 70.0 % of the enzymes in GAC in the conditions of 10.0 g of support, 15.7 rad/s of agitation and 90 minutes of contact time, and 100.0 % of enzymes in ACB when using 5 g of support, agitation of 15.7 rad/s and contact time of 120 minutes. In enzymatic oxidation tests, tyrosinase immobilized in GAC was able to achieve a final phenol concentration below the limit required by Brazilian law, 0.5 mg/L for phenol solutions with an initial concentration up to 20.0 mg/L while the enzyme immobilized in ACB was able to adapt solutions with initial concentrations of phenol up to 40.0 mg /L. It was possible to reuse the enzyme immobilized in GAC 2 times, maintaining the same phenol removal efficiency, while the enzyme immobilized in ACB maintained up to 98.0 % of its efficiency in 5 cycles of enzymatic oxidation of solutions with 10.0 mg/L of phenol initially. It was possible to maintain the same phenol removal efficiency as immobilized enzymes when stored for up to 2 weeks.

Orthogonal Experiments for Optimizing Adsorption Process of Methyl Orange onto Granular Activated Carbon

2012 ◽  
Vol 610-613 ◽  
pp. 1639-1644
Author(s):  
Wei Fang Dong ◽  
Li Hua Zang ◽  
Qi Lei Feng
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Removal Efficiency ◽  
Contact Time ◽  
Adsorption Process ◽  
Granular Activated Carbon ◽  
Optimum Time ◽  
Orthogonal Experiments ◽  
Methyl Orange Dye ◽  
Influence Degree

This study investigated the treatment of methyl orange dye from aqueous solution with granular activated carbon as sorbents. Adsorption experiments were carried out at different contact time, the dosage of granular activated carbon, pH and initial dye concentration.Orthogonal experiment was designed to analyze the influence degree of operating parameters for optimizing adsorption process. The results demonstrated that the dosage of granular activated carbon had the greatest impact on the removal efficiency of methyl orange , followed by pH, contact time and initial concentration of methyl orange . The granular activated carbon possessed good adsorption capacity to methyl orange which the removal efficiency could reached 98.06% at the optimum dosage 4g and optimum time 90min.

scholarly journals Preparation and characterization of powdered and granular activated carbon from Palmae biomass for mercury removal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Davidson Egirani ◽  
Mohd T. Latif ◽  
Napoleon Wessey ◽  
Nanfe . R. Poyi ◽  
Nabila Shehata
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Activated Carbons ◽  
Granular Activated Carbon ◽  
Mercury Removal ◽  
Palm Tree ◽  
Adsorption Efficiency ◽  
Batch Mode ◽  
Ion Removal

AbstractTwo forms of activated carbon (i.e., granular and powdered forms) used to test mercury removal in solution. These activated carbons were obtained from the shells of a palmae biomass and used in mercury ion removal in aquatic systems. The African palmae shell taken out from a broadly and simply full-fledged palm tree. This biomass serves as a precursor in the formulation of activated carbons not documented. The powdered and granular fractions of activated carbons described for chemical composition, isoelectric point, and surface area. The mechanism of reactions and the kinetics involved were studied using the results of protonation and rate limitations. The parameters used in the batch mode study included pH, contact time, initial concentration of the adsorbate and the dose of the activated carbons. A comparison of performances, contact time demonstrated the highest adsorption efficiency of 93% for the powdered activated carbon and 92% for the granular activated carbon. The dosage recorded the lowest adsorption efficiency of 84% using granular activated carbon. Comparatively, this study brought to the fore that activated carbon derived from the Plamae biomass remains a novel bio-sorbent

scholarly journals Removal of organochlorine pesticides from water using virgin and regenerated granular activated carbon

2010 ◽  
Vol 75 (4) ◽  
pp. 565-573 ◽  
Author(s):  
Mirjana Ninkovic ◽  
Rada Petrovic ◽  
Mila Lausevic
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Breakthrough Curves ◽  
Water Production ◽  
Saturation Point ◽  
Chlorinated Pesticides ◽  
Halogenated Aromatic Hydrocarbons ◽  
Adsorption Capacities ◽  
Public Water Systems ◽  
Derivatives Of

Public water systems use granular activated carbon in order to eliminate pesticides. After saturation, the used activated carbon is regenerated and reused in order to reduce the costs of water production and minimize waste. In this study, the adsorption of 10 different chlorinated pesticides from water using columns packed with commercial virgin and regenerated granular activated carbon was simulated in order to compare their adsorption capacities for different chlorinated pesticides. The breakthrough curves showed that chlorinated pesticides from the group of hexachlorocyclohexane (HCH) were poorly adsorbed, followed by cyclodiens as averagely adsorbed and the derivatives of halogenated aromatic hydrocarbons (DDT) as strongly absorbed. However, the adsorption capacity of regenerated granular activated carbon was considerably lower for tested pesticides compared to the virgin granular carbon. In addition, rinsing of the pesticides after the saturation point is a far more efficient process on regenerated carbon.

Removal of Geosmin by Powered Activated Carbon as an Emergency Method

2014 ◽  
Vol 587-589 ◽  
pp. 616-619
Author(s):  
Zheng Wang ◽  
Dong Zhang ◽  
Ping Xia ◽  
Hui Ye ◽  
Wen Qi Zhou
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Efficiency ◽  
Initial Concentration ◽  
Application Point ◽  
Removal Efficiencies

The removal of geosmin by powered activated carbon (PAC) was studied at laboratory to select suitable PAC type and the removal efficiencies of geosmin by PAC in different application point as an emergency method were evaluated. The adsorption efficiency of coal-based PAC on geosmin was superior to that of bamboo-based PAC. The contact time and PAC dose were two important factors that affect the removal effect of geosmin. Geosmin could be controled below 10ng/L at 200ng/L of initial concentration.

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