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Coagulation/flocculation treatments for flue-gas-derived water from oxyfuel power production with CO2 capture / Sivaram Harendra in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10335-10343 Titre : Coagulation/flocculation treatments for flue-gas-derived water from oxyfuel power production with CO2 capture Type de document : texte imprimé Auteurs : Sivaram Harendra, Auteur ; Danylo Oryshchyn, Auteur ; Thomas Ochs, Auteur Année de publication : 2011 Article en page(s) : pp. 10335-10343 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Production  Gaseous  effluent  Flocculation  Coagulation Résumé : Capturing CO2 from fossil fuel combustion provides an opportunity for tapping a significant water source that can be used as service water for a capture-ready power plant and its peripherals: more than 5% of the mass of water required for cooling-tower makeup in an oxy-fired plant employing integrated pollutant removal (IPR) for capture. Water condensed from oxycombustion flue gas by the National Energy Technology Laboratory's (NETL's) integrated pollutant removal (IPR) CO2-capture process has been analyzed for composition, and an approach for its treatment, for both in-process reuse and release, has been outlined. Experiments were performed to develop specifications for the first step (coagulation/flocculation) of this treatment approach. The results show that flocculation can remove most cations and reduce fine particulates by at least 90%. The speed of separation points to fast, in-line treatment of water for reuse within IPR, thus minimizing the water requirements for CO2 capture. In experiments, flocculation/coagulation removed few of the anions from solution. However, the remaining supernatant is amenable to reverse osmosis, crystallization, and ion-exchange processes for anion removal and cleanup of the remaining cations. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483679 [article] Coagulation/flocculation treatments for flue-gas-derived water from oxyfuel power production with CO2 capture [texte imprimé] / Sivaram Harendra, Auteur ; Danylo Oryshchyn, Auteur ; Thomas Ochs, Auteur . - 2011 . - pp. 10335-10343. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10335-10343 Mots-clés : Carbon  dioxide  Production  Gaseous  effluent  Flocculation  Coagulation Résumé : Capturing CO2 from fossil fuel combustion provides an opportunity for tapping a significant water source that can be used as service water for a capture-ready power plant and its peripherals: more than 5% of the mass of water required for cooling-tower makeup in an oxy-fired plant employing integrated pollutant removal (IPR) for capture. Water condensed from oxycombustion flue gas by the National Energy Technology Laboratory's (NETL's) integrated pollutant removal (IPR) CO2-capture process has been analyzed for composition, and an approach for its treatment, for both in-process reuse and release, has been outlined. Experiments were performed to develop specifications for the first step (coagulation/flocculation) of this treatment approach. The results show that flocculation can remove most cations and reduce fine particulates by at least 90%. The speed of separation points to fast, in-line treatment of water for reuse within IPR, thus minimizing the water requirements for CO2 capture. In experiments, flocculation/coagulation removed few of the anions from solution. However, the remaining supernatant is amenable to reverse osmosis, crystallization, and ion-exchange processes for anion removal and cleanup of the remaining cations. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483679

Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) / Sivaram Harendra in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5831-5837 Titre : Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) Type de document : texte imprimé Auteurs : Sivaram Harendra, Auteur ; Cumaraswamy Vipulanandan, Auteur Année de publication : 2011 Article en page(s) : pp. 5831-5837 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubilization  Surfactant Résumé : Enhanced solubilization of dense nonaqueous phase liquids (DNAPLs) especially chlorinated hydrocarbons using four types of surfactants was investigated. The solubilization kinetics of perchloroethylene PCE ( 100 mg/L solubility in water) and trichloroethylene TCE (1000 mg/L) in anionic (sodium dodecyl sulfate (SDS)), nonionic (Triton X-100), cationic (cetyltrimethylammoniun bromide (CTAB)), and a biosurfactant (UH biosurfactant) were investigated at room temperature in continuously stirred batch reactors. The size distribution of surfactant micelles were measured using the dynamic light scattering device (DLS). The mean size of SDS, CTAB, Triton X-100, and UH biosurfactant micelles were 4.2 nm, 3.8 nm, 4.5 nm, and 59.1 nm, respectively. Micelle partition coefficients (Km) and molar solubility ratio (MSR) for PCE and TCE in 10 g/L of surfactant solutions have been quantified, and the solubility of PCE and TCE in the surfactant solutions increased by about 10-fold. Solubilization kinetics for PCE and TCE in various surfactant solutions was represented using a hyperbolic relationship. Also the relationship between solubility and interfacial surface tension reduction was investigated. Of the surfactants studied, Triton X-100 had the highest PCE solubilized per gram of surfactant, whereas for TCE, biosurfactant had the highest TCE solubility per gram of surfactant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128709 [article] Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) [texte imprimé] / Sivaram Harendra, Auteur ; Cumaraswamy Vipulanandan, Auteur . - 2011 . - pp. 5831-5837. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5831-5837 Mots-clés : Solubilization  Surfactant Résumé : Enhanced solubilization of dense nonaqueous phase liquids (DNAPLs) especially chlorinated hydrocarbons using four types of surfactants was investigated. The solubilization kinetics of perchloroethylene PCE ( 100 mg/L solubility in water) and trichloroethylene TCE (1000 mg/L) in anionic (sodium dodecyl sulfate (SDS)), nonionic (Triton X-100), cationic (cetyltrimethylammoniun bromide (CTAB)), and a biosurfactant (UH biosurfactant) were investigated at room temperature in continuously stirred batch reactors. The size distribution of surfactant micelles were measured using the dynamic light scattering device (DLS). The mean size of SDS, CTAB, Triton X-100, and UH biosurfactant micelles were 4.2 nm, 3.8 nm, 4.5 nm, and 59.1 nm, respectively. Micelle partition coefficients (Km) and molar solubility ratio (MSR) for PCE and TCE in 10 g/L of surfactant solutions have been quantified, and the solubility of PCE and TCE in the surfactant solutions increased by about 10-fold. Solubilization kinetics for PCE and TCE in various surfactant solutions was represented using a hyperbolic relationship. Also the relationship between solubility and interfacial surface tension reduction was investigated. Of the surfactants studied, Triton X-100 had the highest PCE solubilized per gram of surfactant, whereas for TCE, biosurfactant had the highest TCE solubility per gram of surfactant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128709