carbon adsorption Articles
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Common Treatment Technologies for Halogenated VOCs in Air Emissions/ Off-Gases
Three technologies that are most commonly used to treat halogenated VOCs in air emissions/off-gases are carbon adsorption, catalytic oxidation, and thermal oxidation. Carbon adsorption is a remediation technology in which pollutants are removed from air by physical adsorption onto the carbon grain. Carbon is 'activated' for this purpose by processing the carbon to create porous particles with a ...
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Activated Carbon Adsorption System Addresses VOC Emissions Problems for New York Circuit Board Manufacturer - Case Study
A number of technologies were investigated. The concentration method using regenerative activated carbon was selected for this high flow low concentration application. It incorporates the CR Clean Air patent pending, Revaporative technology to reduce operating and capital costs. PHOTOCIRCUITS manufactures printed circuit boards, primarily for automotive use in motor vehicle dashboards and ...
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The removal of organic pollutants from industrial effluents via tapered bed adsorption columns
Tapered bed adsorption columns, using activated carbon, have been used to study the removal of two organic pollutants, an acid dye and para-chlorophenol, from aqueous effluent. Equilibrium sorption isotherms were measured to provide the saturation capacity (qe) of each pollutant by Chemviron Filtrasorb 400 carbon, for operating continuous adsorption columns. The three parameter Redlich-Peterson ...
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Dehalogenation
Introduction: Contaminated soil is screened, processed with a crusher and pug mill, and mixed with reagents. The mixture is heated in a reactor. The dehalogenation process is achieved by either the replacement of the halogen molecules or the decomposition and partial volatilization of the contaminants. Base-catalyzed Decomposition (BCD) Base-catalyzed decomposition (BCD) process was developed ...
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Competitive adsorption of micropollutants and NOM onto activated carbon: comparison of different model approaches
Conventional adsorption models are not able to describe exactly the competitive adsorption of natural organic matter (NOM) and micropollutants during drinking water treatment with activated carbon. This problem is a consequence of the complex structure of natural organic matter. In the last years, two user-oriented model approaches, the tracer model (TRM) and the equivalent background compound ...
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Microcystin-LR removal from drinking water supplies by chemical oxidation and activated carbon adsorption
Microcystin-LR (MC-L) is among the most toxic and frequent cyanotoxins found in surface water and a provisional value of 0.001 mg/L is indicated by World Health Organization guidelines for water for human consumption. Among the conventional processes used for surface water treatment, the most effective in microcystin removal are chemical oxidation and adsorption. This study investigated two ...
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Arsenic(III) removal by adsorption on sawdust carbon
Studies on the removal of As(III) by adsorption on sawdust and sawdust carbon have been carried out at room temperature (25 ± 1°C). The adsorption isotherm of As(III) on sawdust carbon was obtained in a batch reactor. The process of uptake follows the first-order adsorption rate expression and obeys the Langmuir and Freundlich model of adsorption. The mass transfer coefficients as a function of ...
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12 types of air emission treatment equipment
During the industrial production of products, as long as there is waste gas, environmental protection equipment must be installed. Otherwise, if the EIA fails to meet the standards, it will face fines. Serious and refusal to make corrections may also face the risk of suspension of production and business.Common 12 kinds of air emission treatment equipment1. The fume purifier is a fume exhaust gas ...
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Characteristic numbers of granular activated carbon for the elimination of micropollutants from effluents of municipal wastewater treatment plants
Adsorption on granular activated carbon (GAC) is a promising step to extend existing treatment trains in municipal wastewater treatment plants (WWTPs) and, thus, to reduce the concentration of micropollutants (MPs) (e.g. pharmaceuticals) in wastewater. It is common practice to use characteristic numbers when choosing GAC for a specific application. In this study, characteristic numbers were ...
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Common treatment methods for industrial organic waste gas
At present, the international treatment methods for industrial organic waste gas mainly include physical method, chemical method, biological method, including adsorption, direct combustion, catalytic combustion, chemical oxidation, biological filter and other treatment methods. At this stage, my country's main treatment processes for organic waste gas include isolation method, combustion method, ...
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Carbon Molecular Sieve Dessicant
Carbon Molecular Sieve used in the PSA Nitrogen generation, the Nitrogen generation by Pressure Swing Adsorption (PSA) process is a technology used to separate nitrogen from a mixture of gases under pressure according to the special selective adsorption characteristics of the Carbon Molecular Sieves (CMS).The Carbon molecular sieve is a material containing tiny pores of a precise and uniform size ...
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In-Pile thermal desorption for treatment of Dioxin-Contaminated soil in Japan
Abstract A demonstration of thermal treatment of dioxin-contaminated soil was completed in Japan, under the sponsorship of the Japan Ministry of the Environment. TerraTherm’s proprietary In-Pile Thermal Desorption process was demonstrated to successfully treat the soil to the required standard of 1,000 picograms of 2,3,7,8-tetrachlorodibenzodioxin (TCDD) toxic equivalents (TEQ) per gram ...
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Effective VOC hazardous waste gas treatment technology
Organic waste gas adsorption treatment, which is a treatment method that physically adsorbs and collects VOC. Activated carbon, zeolite, silica, etc. are used as adsorbents. Due to its size, the pores of the adsorbent are called micropores with a diameter of 2 nm or less, mesopores with a diameter of 2 to 50 nm, and macropores with a diameter of 2 nm or more. It is the micropores that increase ...
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Activated carbons from waste of oil-palm kernel shells, sawdust and tannery leather scraps and application to chromium(VI), phenol, and methylene blue dye adsorption
Phenol, chromium, and dyes are continuously dumped into water bodies; the adsorption of these contaminants on activated carbon is a low-cost alternative for water remediation. We synthesized activated carbons from industrial waste of palm oil seed husks (kernel shells), sawdust, and tannery leather scraps. These materials were heated for 24 h at 600, 700 or 800°C, activated at 900°C with CO2 ...
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Common Treatment Technologies for Fuels in Ground Water, Surface Water, and Leachate
It may be necessary to know other subsurface information to remediate fuels in ground water. Treatability testing to characterize contaminant biodegradability and nutrient content may be needed for any biodegradation technology. A subsurface geologic characterization would be particularly important to characterize the migration of NAPLs. Recovery tests are usually necessary to design a ...
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Activated carbon prepared from coffee pulp: potential adsorbent of organic contaminants in aqueous solution
The processing of coffee beans generates large amounts of solid and liquid residues. The solid residues (pulp, husk and parchment) represent a serious environmental problem and do not have an adequate disposal mechanism. In this work, activated carbons (ACs) for adsorption of organic compounds were prepared from coffee pulp by controlled temperature at different pulp/Na2HPO4 ratios (4:1, 2:1, ...
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Adsorption kinetics and thermodynamics of hydrophobic natural organic matter (NOM) removal from aqueous solution by multi-wall carbon nanotubes
The objective of this research was to study the efficiency of Multi-Walled Carbon Nanotubes (MWCNTs) for the adsorption of hydrophobic natural organic matter (NOM) from aqueous solution under different operational conditions of contact time, pH, initial concentration of NOM and temperature. MWCNTs were synthesized via chemical vapor deposition (CVD) with average diameter of 10–50 nm. The ...
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Prospective environmental and economic assessment for biotreatment of micropollutants in drinking water resources in Denmark
A prospective environmental life cycle assessment (LCA) and financial cost assessment is performed to the application of bioaugmentation to sand filters in Danish waterworks, to remove 2,6-dichlorobenzamide (BAM) from drinking water resources. Based on pilot-scale and laboratory-scale data, we compare bioaugmentation to current alternative strategies, namely granular activated carbon (GAC) ...
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Common Treatment Train for Nonhalogenated VOCs
A treatment train is the combination of different treatment technologies. A system diagram of a common treatment train for nonhalogenated VOCs is illustrated below. A soil vapor extraction system is used to pull VOC vapor from the contaminated soil. An air sparging system delivers air below the water table to enhance bioremediation. After passing through a liquid/vapor separator, the VOC ...
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Adsorption behavior of activated carbon derived from pyrolusite-modified sewage sludge: equilibrium modeling, kinetic and thermodynamic studies
Activated carbon was developed from sewage sludge using pyrolusite as an additive. It was demonstrated that the removal efficiency of two synthetic dyes (Tracid orange GS and Direct fast turquoise blue GL) by the produced adsorbent was up to 97.6%. The activated carbon with pyrolusite addition had 38.2% higher surface area, 43.8% larger micropore and 54.4% larger mesopore production than ordinary ...
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