TY - JOUR
T1 - A micro-aerobic hydrolysis process for sludge in situ reduction
T2 - Performance and microbial community structure
AU - Zhou, Zhen
AU - Qiao, Weimin
AU - Xing, Can
AU - Shen, Xuelian
AU - Hu, Dalong
AU - Wang, Luochun
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2014/12/1
Y1 - 2014/12/1
N2 - A sludge process reduction activated sludge (SPRAS) system by inserting a sludge process reduction (SPR) module, composed of a micro-aerobic tank and a settler, before activated sludge process was operated for sludge in situ reduction. The average removal efficiencies of COD and ammonium nitrogen were 86.6% and 87.9%, respectively. Compared to anoxic/aerobic (AO) process, SPRAS process reduced sludge production by 57.9% with observed sludge yield of 0.076. gVSS/gCOD. Pyrosequencing analyses revealed that the relative abundance and stability of microbial communities in SPRAS system were higher than AO system. Fermentative acidogenic classes Anaerolineae, Actinobacteria, Cytophagia and Caldilineae were enriched in the SPR module and responsible for sludge reduction. Specific comparison down to the genus level identified the enrichment of oxyanion-reducing bacteria (. Sulfuritalea; Azospira; Ramlibacter), fermentative acidogenic bacteria (. Propionivibrio; Opitutus; Caldilinea), slow growers (. Ramlibacter) and predatory bacteria (. Myxobacteria) in SPRAS system. Nitrifiers were also more abundant in SPRAS system than AO system.
AB - A sludge process reduction activated sludge (SPRAS) system by inserting a sludge process reduction (SPR) module, composed of a micro-aerobic tank and a settler, before activated sludge process was operated for sludge in situ reduction. The average removal efficiencies of COD and ammonium nitrogen were 86.6% and 87.9%, respectively. Compared to anoxic/aerobic (AO) process, SPRAS process reduced sludge production by 57.9% with observed sludge yield of 0.076. gVSS/gCOD. Pyrosequencing analyses revealed that the relative abundance and stability of microbial communities in SPRAS system were higher than AO system. Fermentative acidogenic classes Anaerolineae, Actinobacteria, Cytophagia and Caldilineae were enriched in the SPR module and responsible for sludge reduction. Specific comparison down to the genus level identified the enrichment of oxyanion-reducing bacteria (. Sulfuritalea; Azospira; Ramlibacter), fermentative acidogenic bacteria (. Propionivibrio; Opitutus; Caldilinea), slow growers (. Ramlibacter) and predatory bacteria (. Myxobacteria) in SPRAS system. Nitrifiers were also more abundant in SPRAS system than AO system.
KW - Microbial community
KW - Pyrosequencing
KW - Sludge process reduction activated sludge (SPRAS) process
KW - Sludge reduction
KW - Wastewater treatment
UR - https://www.scopus.com/pages/publications/84908571884
U2 - 10.1016/j.biortech.2014.09.119
DO - 10.1016/j.biortech.2014.09.119
M3 - 文章
AN - SCOPUS:84908571884
SN - 0960-8524
VL - 173
SP - 452
EP - 456
JO - Bioresource Technology
JF - Bioresource Technology
ER -
