Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 29 for “"powdered activated carbon"”.
-
Modeling Powdered Activated Carbon Performance in Membrane Filtration Systems
… results of this study showed that, for a given carbon dose, the application of carbon as a pulse input always yields lower adsorbate concentrations in the membrane permeate. Furthermore, application of the activated carbon to continuous-flow reactors installed upstream of the membranes, and the …
-
Chlorine dioxide by-products in drinking water and their control by powdered activated carbon
… chlorination. The chlorite-removal capability of powdered activated carbon (PAC) was evaluated in both laboratory- and pilot-scale studies. Chlorite removal by PAC in laboratory studies decreased with increasing pH over a range from pH 5.5 to 7.5 and varied with the type of PAC. Chlorite was …
-
Measuring and modeling geosmin removal from Horsetooth Reservoir water by powdered activated carbon for selected contact times
… the Horsetooth Reservoir, in Fort Collins, CO by powdered activated carbon (PAC). Raw water samples were spiked with stock geosmin solution to obtain concentrations from 10 to 50 ng/L and stock PAC solution to obtain concentrations from 5 to 20 mg/L. Thirteen different geosmin/PAC concentrations …
-
Evaluation of the use of powdered activated carbon for the control of organic compounds during drinking water treatment
Powdered activated carbon (PAC) is commonly used in drinking water treatment plants to control taste and odor, and it is available to remove synthetic organic chemicals (SOCs) that must be controlled to meet drinking water standards. The objective of this study was to show how the adsorptive …
-
An investigation of the effects of the addition of powdered activated carbon to the activated sludge of cellulose acetate manufacturing wastewater
Equilibrium powdered activated carbon (PAC) concentrations of 20, 160, and 280 mg/L in activated sludge reactors treating cellulose acetate manufacturing wastewater were found to enhance substrate removal. The improved substrate removal as measured by COD averaged 20 percent. The apparent mechanism …
-
Auswirkungen von Pulveraktivkohle auf die Nanofiltration von Kläranlagenablauf
Process combinations of powdered activated carbon adsorption and succeeding membrane process are currently under investigation for several different water treatment applications and a few full-scale applications of this kind of process already exist. Since the powdered activated carbon is usually …
-
Use of polymers and a surfactant in the treatment of Kraft process wastewater
… performance varied with the polymer tested. Powdered activated carbon addition improved the performance of the polymers. The color removal ability of EHDABr was evaluated by jar test, and by continuous-flow foam flotation.. EHDABr removed 77% of the wastewater color by jar test and was …
-
Predicting the removal of atrazine by powdered and granular activated carbon
… atrazine removal in full scale and pilot scale powdered activated carbon (PAC) and granular activated carbon (GAC) adsorption processes.
-
Evaluation of treatment alternatives for THM-precursor removal from the Po River and Ni River, Virginia
… and chlorine dioxide preoxidation, and powdered activated carbon pretreatment for the removal of trihalomethane (THM) precursors from the Po River, the Ni River and the Ni River Reservoir waters in eastern Virginia. The effects of temperature and storage were also studied. Samples were …
-
The reduction of bromate in drinking water by activated carbon
… drinking water has been studied. Both granular activated carbon and powdered activated carbon have been used to reduce bromate. Solution characteristics which influenced the reduction of bromate during this study include solution pH, initial bromate concentration, ionic strength of the solution, …
-
Characterization of gas phase adsorption capacity of untreated and chemically treated activated carbon cloths
Granular activated carbon (GAC) and powdered activated carbon (PAC) have long been used to effectively treat drinking water, waste water, and industrial gas streams. Undesired contaminants are removed by adsorption onto activated carbon. While activated carbon has been used extensively in …
-
Evaluation of activated carbon processes for removing trihalomethane precursors from a surface water impoundment
… Virginia to investigate the effectiveness of powdered activated carbon [PAC] and granular activated carbon [GAC], with and without preoxidation, for reducing trihalomethane [THM] precursor concentrations in Harwood's Mill Reservoir water. Preoxidation with ozone followed by GAC is referred to …
-
Verfahrenskombination von Nanofiltration und Adsorption an Pulverkohle zur kontinuierlichen Abwasserreinigung
… processes can achive only one of these goals. Powdered adsorbents have to be used in high (i.e. expensiv) quantities for complete COD-removal (chemical oxigen demand) resulting in little loadings of the adsorbent (mass of eliminated contaminant per mass of adsorbent). Basically, nanofiltration …
-
Evaluating The Effectiveness Of Proprietary Additives In Improving Capture And Sequestration Of Oxidized Mercury In Scrubber Systems
… technologies consist of the injection of powdered activated carbon (PAC) and ESORB-HG-11 (a halogenated PAC) into the waste gas of a selected Taconite facility and dosing of the plant's scrubber slurry with diethyl dithiocarbamate (DEDTC).</p>
-
Syntheses, Structures and Properties of Metal-Organic Frameworks
… effective material for mercury absorption is powdered activated carbon, which shows increased efficiency when modified with halogen functional groups such as bromine. Metal-organic frameworks (MOFs) have potential applications in mercury capture due to their fantastic properties such as high …
-
The evaluation of metham sodium and dichlobenil impacts on activated sludge nitrification
… undergoes little degradation after application. Powdered activated carbon (PAC) is effective in absorbing metham sodium from raw sewage. In bench scale reactors, application rates of 10 mg PAC per 1 mg metham sodium reduced metham sodium concentrations to levels which did not disrupt the …
-
Effectiveness of water treatment methods for removal of haloforms and their precursors
… especially when followed by doses of activated carbon in the range of 30-50 mg/l. It was also observed that the chlorine concentration had more effect on the production of volatile organics than the humic acid concentration. The reaction between humic acid and chlorine was not …
-
Evaluation of different powdered activated carbons in the control of chlorite ion
Twelve different powdered activated carbons (PACs) were screened under laboratory conditions to determine their performance in the removal of chlorite ions (ClO₂⁻) and in the production of chloride ions (Cl⁻) and chlorate ions (ClO₃⁻) during that removal. All screenings were conducted in reagent …
-
Greenhouse and laboratory study for the land application of water treatment residual
… months. many water treatment plants also add powdered activated carbon (PAC) during the treatment process to prevent taste and odor problems. The PAC ultimately ends up in the residual and alters its chemical characteristics. The effects of land-applied PAC residual on plant growth was also …
-
Air stripping and biological treatment of ammonium sulfate wastewater from the caprolactam manufacturing process
… pretreatment, a flow-through conventional activated sludge system, powdered activated carbon (PAC) treatment and batch testing. Although biological treatment was conducted using conditions to promote nitrifier growth, nitrification was not observed using either conventional or PAC …
Page 1 of 2