carbon adsorption Articles
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Cadmium(II) adsorption by activated carbon: batch studies and reversibility
Adsorption of cadmium(II) by Brazilian activated carbons, in their original and nitric acid activated forms, was evaluated. The equilibrium was reached within the first 15 min of contact between carbon and metal solution, and obeys a pseudo-second order Lagergren model. The maximum adsorption capacity is higher than 64 mg/g for the oxidised sample. Negative ΔG0 values indicate the spontaneity of ...
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Effects of surface functional groups of activated carbon on adsorption of triclosan from aqueous solution
We report adsorption of triclosan by using activated carbons as a potential method to improve the discharge water purification process. Commercially available activated carbons, P1300, Picazine HP and Hydrodarco C, display different levels of affinity for triclosan from aqueous solution. Surface chemistry of these adsorbents were modified via reduction, oxidation and nitridation, to improve and ...
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Modelling GAC adsorption of biologically pre-treated process water from hydrothermal carbonization
Granular-activated carbon (GAC) adsorption of biologically pre-treated process waters from hydrothermal carbonization (HTC) of different materials was investigated. Overall, isotherms showed that most of the dissolved organic substances are strongly adsorbable while the non-adsorbable fractions are small. The equilibrium data were modelled by using five fictive components to represent the ...
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Common Treatment Technologies for Nonhalogenated VOCs in Ground Water, Surface Water and Leachate
It may be necessary to know other subsurface information to provide remediation of VOCs in the ground water. Treatability studies to characterize the biodegradability may be needed for any biodegradation technology. Treatability studies are usually necessary to ensure that the contaminated ground water can be treated effectively at the design flow. A subsurface geologic characterization would be ...
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Common Treatment Technologies for Halogenated VOCs in Ground Water, Surface Water and Leachate
It may be necessary to know other subsurface information to provide remediation of VOCs in the ground water. Treatability studies to characterize the biodegradability may be needed for any biodegradation technologies. Treatability studies are usually necessary to ensure that the contaminated ground water can be treated effectively at the design flow. A subsurface geologic characterization would ...
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Role of the functional groups in the adsorption of bisphenol A onto activated carbon: thermal modification and mechanism
Surface properties of activated carbons play vital roles in adsorption of contaminants. Aiming to improve the adsorption of phenolic endocrine disrupting chemicals (EDCs), commercially activated carbon (W20) was modified via thermal treatment to obtain a carbon sample (W20N) with different characteristics. The content of acidic oxygen-containing groups of W20 was obviously reduced by the ...
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Evaluating a composite cartridge for small system drinking water treatment
A pilot-scale evaluation was conducted at the U.S Environmental Protection Agency (EPA) Test & Evaluation (T&E) Facility in Cincinnati, Ohio, on a multi-layer, cartridge-based system that combines physical filtration with carbon adsorption and ultraviolet (UV) light disinfection to serve as a home-base water treatment security device against accidental or intentional contaminant events. The ...
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Matters needing attention in the treatment of pharmaceutical and chemical waste gas
Some problems existing in the waste gas treatment of the pharmaceutical and chemical industry and the specific method to solve the waste gas treatment problem in the industry, of course, the industry is mainly the waste gas treatment problem of solvents: Problems existing in the treatment of solvent waste gas in pharmaceutical and chemical waste gas treatment After the control and treatment ...
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Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions
In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum ...
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Sustainability assessment of tertiary wastewater treatment technologies: a multi-criteria analysis
The multi-criteria analysis gives the opportunity to researchers, designers and decision-makers to examine decision options in a multi-dimensional fashion. On this basis, four tertiary wastewater treatment (WWT) technologies were assessed regarding their sustainability performance in producing recycled wastewater, considering a ‘triple bottom line’ approach (i.e. economic, environmental, and ...
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Source Water Monitoring Guide for Drinking Water Treatment
The purpose of source water monitoring is to enable drinking water treatment facilities to identify changes in water quality, implement treatment strategies based on the characteristics of the water, optimize the treatment processes, and take preventative actions to protect the source water from intentional and accidental contamination. Unexpected changes in water quality or the presence of ...
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Comparative and integrative environmental assessment of advanced wastewater treatment processes based on an average removal of pharmaceuticals
Pharmaceuticals are normally barely removed by conventional wastewater treatments. Advanced technologies as a post-treatment, could prevent these pollutants reaching the environment and could be included in a centralized treatment plant or, alternatively, at the primary point source, e.g. hospitals. In this study, the environmental impacts of different options, as a function of several advanced ...
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Quantitative microbial risk assessment of drinking water treated with advanced water treatment process
Campylobacter jejuni is one of the major causes of waterborne disease in Japan. A quantitative microbial risk assessment (QMRA) was conducted to evaluate the health risk caused by this pathogen in drinking water treated with a supposed advanced treatment process including ozonation and granular activated carbon adsorption. Coagulation-sedimentation, rapid sand filtration, ozonation, and ...
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Superheated water pretreatment combined with CO2 activation/regeneration of the exhausted activated carbon used in the treatment of industrial wastewater
This paper examines a novel method of regenerating saturated activated carbon after adsorption of complex phenolic, polycyclic aromatic hydrocarbons with low energy consumption by using superheated water pretreatment combined with CO2 activation. The effects of the temperature of the superheated water, liquid–solid ratio, soaking time, activation temperature, activation time, and CO2 flow ...
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Common Treatment Technologies for Nonhalogenated VOCs in Air Emissions/Off-Gases
Three technologies that are most commonly used to treat nonhalogenated 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 ...
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Common Treatment Technologies for Nonhalogenated VOCs
Soil vapor extraction (SVE), thermal desorption, and incineration are the presumptive remedies for Superfund sites with nonhalogenated VOC-contaminated soil. Because a presumptive remedy is a technology that EPA believes, based upon its past experience, generally will be the most appropriate remedy for a specified type of site, the presumptive remedy approach will accelerate site-specific ...
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Introduction of PP plastic sheet engraving and welding
Plastic sheet engraving and welding processing services, with professional plastic anti-corrosion equipment processing machinery and technicians, can process PP and PVC plastic anti-corrosion equipment, such as: plastic towers, anti-corrosion barrels, anti-corrosion ducts, vacuum plastic equipment, etc. Xicheng Ep has Modern CNC machining equipment, cutting, welding and bending are all ...
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Comparison between activated carbon and multiwall carbon nanotubes in the removal of cadmium(II) and chromium(VI) from water solutions
This paper evaluates the aqueous cadmium(II) and chromium(VI) adsorption efficiency on multiwall carbon nanotubes and activated carbon (AC). The effects of pH, initial metal ion concentrations, and adsorbent dosage on the adsorption of heavy metal by carbon adsorbents were also evaluated. In addition, this study used the Langmuir and Freundlich isotherms to describe behavior of equilibrium ...
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Different Biological Water Filtration Systems
Do you know what’s in your water? Most people don’t. It’s recommended that you drink at least a half-gallon of water each day. If it’s not purified or filtered, that water could be causing unseen damage to your body. Arsenic, salmonella, streptococcus, and influenza viruses could all be present in your tap water. There are many different forms of biological filtration that ...
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Wet scrubbers air pollution control devices
Wet scrubbers are effective air pollution control devices used to remove particulates and/or harmful gases from industrial waste streams. Wet scrubbers operate by introducing a dirty gas stream into the scrubbing liquid (usually water + neutralizing liquid). Particles or gases are collected in the scrubbing liquid. Wet scrubbers are often the most suitable air pollution control equipment for ...
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