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Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment / Xiao-Rong Kang in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12372–12378 Titre : Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment Type de document : texte imprimé Auteurs : Xiao-Rong Kang, Auteur ; Guang-Ming Zhang, Auteur ; Lin Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 12372–12378 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pretreatment  Acidification  Hydrolysis  pH Résumé : Batch tests were carried out to analyze the effect of pH in the range of 7-12 on the hydrolysis and acidification of sludge at room temperature. Ultrasonic pretreatment was conducted to disintegrate waste activated sludge (WAS) and accelerate WAS hydrolysis. The experimental results showed that the sludge with ultrasonic pretreatment was readily degraded in the hydrolysis and acidification process, and more organic substances were released with increase of initial pH. The optimal initial pH for sludge acidification was 11, and the short chain fatty acids (SCFAs) concentration reached about 1751 mg/L after 15 days of hydrolysis and acidification. Phosphorus release was investigated during hydrolysis and acidification at any pH adjustment. The SCFAs mainly consisted of acetic and propionic, accounting for 74.6-84% of total SCFAs. Three microbial species, including Bacteroidetes, γ-proteobacteria, and β-proteobacteria, were involved in different pH environments of the hydrolysis and acidification process, and, simultaneously, the three species were identified as being responsible for SCFAs accumulation and protein degradation. This study indicated that the combination of ultrasonic pretreatment, alkaline adjustment for hydrolysis, and acidification of WAS was an appropriate method for SCFAs accumulation and contributed to the demand of carbon source for WWTPs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745708 [article] Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment [texte imprimé] / Xiao-Rong Kang, Auteur ; Guang-Ming Zhang, Auteur ; Lin Chen, Auteur . - 2012 . - pp. 12372–12378. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12372–12378 Mots-clés : Pretreatment  Acidification  Hydrolysis  pH Résumé : Batch tests were carried out to analyze the effect of pH in the range of 7-12 on the hydrolysis and acidification of sludge at room temperature. Ultrasonic pretreatment was conducted to disintegrate waste activated sludge (WAS) and accelerate WAS hydrolysis. The experimental results showed that the sludge with ultrasonic pretreatment was readily degraded in the hydrolysis and acidification process, and more organic substances were released with increase of initial pH. The optimal initial pH for sludge acidification was 11, and the short chain fatty acids (SCFAs) concentration reached about 1751 mg/L after 15 days of hydrolysis and acidification. Phosphorus release was investigated during hydrolysis and acidification at any pH adjustment. The SCFAs mainly consisted of acetic and propionic, accounting for 74.6-84% of total SCFAs. Three microbial species, including Bacteroidetes, γ-proteobacteria, and β-proteobacteria, were involved in different pH environments of the hydrolysis and acidification process, and, simultaneously, the three species were identified as being responsible for SCFAs accumulation and protein degradation. This study indicated that the combination of ultrasonic pretreatment, alkaline adjustment for hydrolysis, and acidification of WAS was an appropriate method for SCFAs accumulation and contributed to the demand of carbon source for WWTPs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745708

Synthesis of iron-doped titanium oxide nanoadsorbent and its adsorption characteristics for fluoride in drinking water / Lin Chen in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13150-13156 Titre : Synthesis of iron-doped titanium oxide nanoadsorbent and its adsorption characteristics for fluoride in drinking water Type de document : texte imprimé Auteurs : Lin Chen, Auteur ; Shuai He, Auteur ; Bo-Yang He, Auteur Année de publication : 2012 Article en page(s) : pp. 13150-13156 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Drinking  water  Adsorption  Titanium  oxide Résumé : A novel iron-doped titanium oxide adsorbent was synthesized by precipitation from a solution of Ti(SO4)2 and FeSO4 and used for fluoride removal from drinking water. The effects of the final pH of the precipitation solution on the adsorbent structure were investigated, and optimized conditions for the synthesis were obtained. The iron doped into the titanium oxide increased the amount of active hydroxyl groups on the adsorbent surface, which increased the fluoride adsorption capacity. The optimized adsorbent had an adsorption capacity of 53.22 mg/g, obtained by fitting adsorption data to the Langmuir isotherm. The adsorption of fluoride followed second-order kinetics. The initial pH of the fluoride solution had little effect on the adsorption capacity. A thermodynamics analysis showed that the adsorption of fluoride ions onto the adsorbent was spontaneous. The adsorbent was easily regenerated with an alkali solution. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451464 [article] Synthesis of iron-doped titanium oxide nanoadsorbent and its adsorption characteristics for fluoride in drinking water [texte imprimé] / Lin Chen, Auteur ; Shuai He, Auteur ; Bo-Yang He, Auteur . - 2012 . - pp. 13150-13156. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13150-13156 Mots-clés : Drinking  water  Adsorption  Titanium  oxide Résumé : A novel iron-doped titanium oxide adsorbent was synthesized by precipitation from a solution of Ti(SO4)2 and FeSO4 and used for fluoride removal from drinking water. The effects of the final pH of the precipitation solution on the adsorbent structure were investigated, and optimized conditions for the synthesis were obtained. The iron doped into the titanium oxide increased the amount of active hydroxyl groups on the adsorbent surface, which increased the fluoride adsorption capacity. The optimized adsorbent had an adsorption capacity of 53.22 mg/g, obtained by fitting adsorption data to the Langmuir isotherm. The adsorption of fluoride followed second-order kinetics. The initial pH of the fluoride solution had little effect on the adsorption capacity. A thermodynamics analysis showed that the adsorption of fluoride ions onto the adsorbent was spontaneous. The adsorbent was easily regenerated with an alkali solution. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451464

The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption / Hai-Xia Wu in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4530–4534 Titre : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption Type de document : texte imprimé Auteurs : Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Lin Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 4530–4534 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Surface  charge  Hydroxyl  group  Fe−Al−Ce  adsorbent  Fluoride  adsorption  External  voltage Résumé : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption were studied. Fluoride adsorption at different initial solution pH was investigated. An external voltage was applied to an adsorbent-coated electrode to examine the adsorption characteristics due to the surface charge. The capability of accepting or providing H+ of the hydroxyl on the adsorbent surface was determined through the titration of NaOH solution, and the change of the hydroxyl before and after adsorption was analyzed by FTIR. Fluoride adsorption was rapid during the initial stage but slowed down later. Fluoride ions were transferred to the adsorbent surface by Coulombic attraction and/or thermal motion, forming a temporary and nonspecific adsorption. The enriched fluoride ions reacted with the hydroxyl groups on the adsorbent surface, forming a stable adsorption. The surface charge on the adsorbent and ion exchange between surface hydroxyl groups and fluoride ions have a large effect on the adsorption rate and efficiency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800890q [article] The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption [texte imprimé] / Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Lin Chen, Auteur . - 2009 . - pp. 4530–4534. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4530–4534 Mots-clés : Surface  charge  Hydroxyl  group  Fe−Al−Ce  adsorbent  Fluoride  adsorption  External  voltage Résumé : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption were studied. Fluoride adsorption at different initial solution pH was investigated. An external voltage was applied to an adsorbent-coated electrode to examine the adsorption characteristics due to the surface charge. The capability of accepting or providing H+ of the hydroxyl on the adsorbent surface was determined through the titration of NaOH solution, and the change of the hydroxyl before and after adsorption was analyzed by FTIR. Fluoride adsorption was rapid during the initial stage but slowed down later. Fluoride ions were transferred to the adsorbent surface by Coulombic attraction and/or thermal motion, forming a temporary and nonspecific adsorption. The enriched fluoride ions reacted with the hydroxyl groups on the adsorbent surface, forming a stable adsorption. The surface charge on the adsorbent and ion exchange between surface hydroxyl groups and fluoride ions have a large effect on the adsorption rate and efficiency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800890q