Documents disponibles écrits par cet auteur

Bench-Scale Operation of a Concrete Sludge Recycling Plant / Atsushi Iizuka in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6099–6104 Titre : Bench-Scale Operation of a Concrete Sludge Recycling Plant Type de document : texte imprimé Auteurs : Atsushi Iizuka, Auteur ; Yuka Sakai, Auteur ; Akihiro Yamasaki, Auteur Année de publication : 2012 Article en page(s) : pp. 6099–6104 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Concrete  sludge  recycling Résumé : A bench-scale plant for waste concrete sludge recycling was designed, constructed, and operated. Real concrete sludge generated from a pile and pole production plant and groundwater were used for the experiments. The process mainly consists of the extraction of calcium ions from the concrete sludge into the aqueous phase and the crystallization of calcium carbonate from the solution with CO2. The CO2 was supplied from boilers installed in the plant, where heavy oil is combusted. High-purity calcium carbonate (>99%) was obtained in the process, with particle sizes distributed in the range of 3–30 μm (volume-based), peaking at about 10 μm. A net reduction in CO2 emissions can be achieved based on the process power consumption and the amount of product. The effects of operating conditions on process performance data such as calcium extraction rate and calcium carbonate crystallization rate were examined, which can lead to scaling-up of the plant. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300620u [article] Bench-Scale Operation of a Concrete Sludge Recycling Plant [texte imprimé] / Atsushi Iizuka, Auteur ; Yuka Sakai, Auteur ; Akihiro Yamasaki, Auteur . - 2012 . - pp. 6099–6104. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6099–6104 Mots-clés : Concrete  sludge  recycling Résumé : A bench-scale plant for waste concrete sludge recycling was designed, constructed, and operated. Real concrete sludge generated from a pile and pole production plant and groundwater were used for the experiments. The process mainly consists of the extraction of calcium ions from the concrete sludge into the aqueous phase and the crystallization of calcium carbonate from the solution with CO2. The CO2 was supplied from boilers installed in the plant, where heavy oil is combusted. High-purity calcium carbonate (>99%) was obtained in the process, with particle sizes distributed in the range of 3–30 μm (volume-based), peaking at about 10 μm. A net reduction in CO2 emissions can be achieved based on the process power consumption and the amount of product. The effects of operating conditions on process performance data such as calcium extraction rate and calcium carbonate crystallization rate were examined, which can lead to scaling-up of the plant. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300620u

Utilization of bipolar membrane electrodialysis for the removal of boron from aqueous solution / Hiroki Nagasawa in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6325-6330 Titre : Utilization of bipolar membrane electrodialysis for the removal of boron from aqueous solution Type de document : texte imprimé Auteurs : Hiroki Nagasawa, Auteur ; Atsushi Iizuka, Auteur ; Akihiro Yamasaki, Auteur Année de publication : 2011 Article en page(s) : pp. 6325-6330 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane  separation  Aqueous  solution  Electrodialysis  Bipolar  membrane Résumé : Bipolar membrane electrodialysis (BMED) was used to remove boron from aqueous solution. BMED was compared with conventional electrodialysis (ED) using aqueous solutions of sodium tetraborate containing 100 mg/L of boron. With use of BMED, more than 90% of the boron was removed under both acidic (pH 2.3) and basic (pH 9.1) conditions, whereas only 35-45% of the boron was removed using conventional ED. Over 90% of the boron was removed from the diluate solution over a wide range of initial pH from 2.3 to 12.0. A high initial pH reduces the current efficiency of boron removal because of the high mobility and high concentration of hydroxide ions compared with those of borate ions. The power requirement for boron removal increased as the initial pH and concentration of sodium chloride increased, but decreased as the applied voltage was increased. BMED is a promising option for removal of boron from aqueous solution. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158927 [article] Utilization of bipolar membrane electrodialysis for the removal of boron from aqueous solution [texte imprimé] / Hiroki Nagasawa, Auteur ; Atsushi Iizuka, Auteur ; Akihiro Yamasaki, Auteur . - 2011 . - pp. 6325-6330. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6325-6330 Mots-clés : Membrane  separation  Aqueous  solution  Electrodialysis  Bipolar  membrane Résumé : Bipolar membrane electrodialysis (BMED) was used to remove boron from aqueous solution. BMED was compared with conventional electrodialysis (ED) using aqueous solutions of sodium tetraborate containing 100 mg/L of boron. With use of BMED, more than 90% of the boron was removed under both acidic (pH 2.3) and basic (pH 9.1) conditions, whereas only 35-45% of the boron was removed using conventional ED. Over 90% of the boron was removed from the diluate solution over a wide range of initial pH from 2.3 to 12.0. A high initial pH reduces the current efficiency of boron removal because of the high mobility and high concentration of hydroxide ions compared with those of borate ions. The power requirement for boron removal increased as the initial pH and concentration of sodium chloride increased, but decreased as the applied voltage was increased. BMED is a promising option for removal of boron from aqueous solution. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158927