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

Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water / Takeshi Sasaki in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9564-9568 Titre : Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water Type de document : texte imprimé Auteurs : Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Atsushi Iizuka, Auteur Année de publication : 2011 Article en page(s) : pp. 9564-9568 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxyapaptite Résumé : Low-crystallinity hydroxyapatite (HAP) was prepared from concrete sludge as a recycling method for concrete waste. The HAP was prepared from model samples of concrete sludge and phosphorus wastewater, and its capacity to remove lead from water was investigated. Lead ions were quickly removed by the HAP particles. Some of the prepared HAP samples reduced the lead concentration of the water to within the Japanese standard for industrial effluent (0.1 ppm). The lead removal capacity of the concrete sludge-derived HAP (506 mg/g) was comparable to that of reagent grade HAP. Lead in water was removed in the form of Pb3(CO3)2(OH)2. These results indicate that HAP prepared from concrete sludge can be applied to removal of lead ions from water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200233s [article] Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water [texte imprimé] / Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Atsushi Iizuka, Auteur . - 2011 . - pp. 9564-9568. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9564-9568 Mots-clés : Hydroxyapaptite Résumé : Low-crystallinity hydroxyapatite (HAP) was prepared from concrete sludge as a recycling method for concrete waste. The HAP was prepared from model samples of concrete sludge and phosphorus wastewater, and its capacity to remove lead from water was investigated. Lead ions were quickly removed by the HAP particles. Some of the prepared HAP samples reduced the lead concentration of the water to within the Japanese standard for industrial effluent (0.1 ppm). The lead removal capacity of the concrete sludge-derived HAP (506 mg/g) was comparable to that of reagent grade HAP. Lead in water was removed in the form of Pb3(CO3)2(OH)2. These results indicate that HAP prepared from concrete sludge can be applied to removal of lead ions from water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200233s

Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance / Takeshi Sasaki in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5813–5817 Titre : Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance Type de document : texte imprimé Auteurs : Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Teruhisa Hongo, Auteur Année de publication : 2012 Article en page(s) : pp. 5813–5817 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorbent  Concrete  sludge Résumé : We prepared a solid adsorbent for boron removal using real concrete sludge. The sludge was diluted with water at dilution ratios from 1 to 15. The diluted concrete sludge was then filtered and dried. Two types of drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The boron removal performance was examined using a boric acid solution containing 100 mgB/L. All of the adsorbents prepared showed boron removal capacity. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest boron removal capacity; the boron concentration after 24 h was just 3.33 mg/L, which is below the Japanese standard for industrial effluent (10 mg/L), and the maximum adsorption capacity for boron was 50 mgboron/gadsorbent. The drying method had a significant effect on both the rate and capacity of boron removal. With natural drying under atmospheric conditions, the adsorption initially proceeded quickly, but the final amount adsorbed was lower than that for the force-dried adsorbents. The boron removal can be attributed to ion exchange and uptake of boron in the ettringite phase. These results indicate that boron adsorbents prepared from concrete sludge can be applied for the removal of boron from effluents. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024646 [article] Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance [texte imprimé] / Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Teruhisa Hongo, Auteur . - 2012 . - pp. 5813–5817. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5813–5817 Mots-clés : Adsorbent  Concrete  sludge Résumé : We prepared a solid adsorbent for boron removal using real concrete sludge. The sludge was diluted with water at dilution ratios from 1 to 15. The diluted concrete sludge was then filtered and dried. Two types of drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The boron removal performance was examined using a boric acid solution containing 100 mgB/L. All of the adsorbents prepared showed boron removal capacity. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest boron removal capacity; the boron concentration after 24 h was just 3.33 mg/L, which is below the Japanese standard for industrial effluent (10 mg/L), and the maximum adsorption capacity for boron was 50 mgboron/gadsorbent. The drying method had a significant effect on both the rate and capacity of boron removal. With natural drying under atmospheric conditions, the adsorption initially proceeded quickly, but the final amount adsorbed was lower than that for the force-dried adsorbents. The boron removal can be attributed to ion exchange and uptake of boron in the ettringite phase. These results indicate that boron adsorbents prepared from concrete sludge can be applied for the removal of boron from effluents. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024646