| Title: | Influence of hydraulic retention time on the psychrophilic hydrolysis/acidogenesis of proteins |
| Author(s): | Poirrier P; Schiappacasse MC; Carballa M; Lema JM; |
| Address: | "School of Biochemical Engineering, Pontificia Universidad Catolica de Valparaiso, Brasil 2085, Valparaiso, Chile E-mail: paola.poirrier@pucv.cl. Department of Chemical Engineering, School of Engineering, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain" |
| ISSN/ISBN: | 0273-1223 (Print) 0273-1223 (Linking) |
| Abstract: | "The influence of the hydraulic retention time (HRT) on the anaerobic hydrolysis of complex substrates has been studied under psychrophilic conditions. For this purpose, a continuous stirred tank reactor was operated at 15 degrees C and neutral pH and gelatin was considered as a model protein. Three HRTs have been tested: 12, 21 and 36 h. Gelatin hydrolysis was greatly dependent on HRT, increasing from 40% at 12 h-HRT to a maximum of 65% at 36 h-HRT. Molecular size distribution analyses of the effluent showed that hydrolysation of compounds larger than 10 kDa was poor at 12 h-HRT, whereas the fraction of 1-10 kDa was completely transformed into compounds smaller than 1 kDa. Higher HRT (36 h) improved the degradation of the recalcitrant fraction (>10 kDa), obtaining an effluent with around 95% of soluble molecules (<1 kDa). In that way, the use of membrane bioreactors for the treatment of this type of macromolecules could improve the degradation efficiencies by enabling to increase the residence time of the non-hydrolyzed molecules, with what would be possible to achieve higher organic loading rate operation" |
| Keywords: | "*Bioreactors Fatty Acids, Volatile/*metabolism Gelatin/*metabolism Hydrogen-Ion Concentration Hydrolysis Wastewater/chemistry Water Pollutants/*metabolism;" |
| Notes: | "MedlinePoirrier, Paola Schiappacasse, Maria Cristina Carballa, Marta Lema, Juan M eng England 2016/11/20 Water Sci Technol. 2016 Nov; 74(10):2399-2406. doi: 10.2166/wst.2016.425" |
