TY - JOUR
T1 - Influence of hydraulic retention time on the psychrophilic hydrolysis/acidogenesis of proteins
AU - Poirrier, Paola
AU - Schiappacasse, María Cristina
AU - Carballa, Marta
AU - Lema, Juan M.
N1 - Funding Information:
This work was supported by the FONDECYT Project No. 11080243 and by a postdoctoral contract from the Xunta de Galicia (Isidro Parga Pondal program, IPP-08-37).
Publisher Copyright:
© IWA Publishing 2016.
PY - 2016/11
Y1 - 2016/11
N2 - 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 WC 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.
AB - 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 WC 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.
KW - Anaerobic process
KW - Hydrolysis-acidogenesis
KW - Particulate size
KW - Protein
KW - Psychrophilic
UR - http://www.scopus.com/inward/record.url?scp=85021857752&partnerID=8YFLogxK
U2 - 10.2166/wst.2016.425
DO - 10.2166/wst.2016.425
M3 - Article
C2 - 27858796
AN - SCOPUS:85021857752
VL - 74
SP - 2399
EP - 2406
JO - Water Science and Technology
JF - Water Science and Technology
SN - 0273-1223
IS - 10
ER -