TY - GEN
T1 - Influence of substrate load on polyhydroxyalkanoates (PHA) accumulation by unenriched mixed cultures from excess sludge fermentation liquid
AU - Cai, Mengmeng
AU - Cui, Fuyi
AU - Zhao, Qingliang
AU - Chua, Hong
PY - 2012
Y1 - 2012
N2 - To reduce the production cost of polyhydroxyalkanoates (PHA) and disposal amount of excess sludge simultaneously, volatile fatty acids (VFAs) from alkaline excess sludge fermentation was used as carbon sources to synthesize PHA by unenriched mixed cultures. Released phosphorus and residual ammonium in the fermentative VFAs was controlled by adding magnesium to form struvite precipitation. Four VFAs liquids obtained was used to test the influence of initial carbon load and carbon to nitrogen ratio (C:N ratio) on the VFAs uptake rate, PHA storage rate and biomass growth rate. Results show that higher initial carbon substrate load results in relatively higher VFAs uptake rate and higher PHA storage rate, while higher initial C:N ratio results in relatively lower biomass growth rate from VFAs. VFAs generated from thermophilic alkaline sludge fermentation were a suitable carbon source for PHA production by mixed cultures.
AB - To reduce the production cost of polyhydroxyalkanoates (PHA) and disposal amount of excess sludge simultaneously, volatile fatty acids (VFAs) from alkaline excess sludge fermentation was used as carbon sources to synthesize PHA by unenriched mixed cultures. Released phosphorus and residual ammonium in the fermentative VFAs was controlled by adding magnesium to form struvite precipitation. Four VFAs liquids obtained was used to test the influence of initial carbon load and carbon to nitrogen ratio (C:N ratio) on the VFAs uptake rate, PHA storage rate and biomass growth rate. Results show that higher initial carbon substrate load results in relatively higher VFAs uptake rate and higher PHA storage rate, while higher initial C:N ratio results in relatively lower biomass growth rate from VFAs. VFAs generated from thermophilic alkaline sludge fermentation were a suitable carbon source for PHA production by mixed cultures.
KW - Aerobic dynamic feeding
KW - Carbon to ammonium ratio
KW - Excess sludge fermentation
KW - Mixed cultures
KW - Polyhydroxyalkanoates
KW - Substrate load
UR - https://www.scopus.com/pages/publications/84857162611
U2 - 10.4028/www.scientific.net/AMR.455-456.856
DO - 10.4028/www.scientific.net/AMR.455-456.856
M3 - 会议稿件
AN - SCOPUS:84857162611
SN - 9783037853009
T3 - Advanced Materials Research
SP - 856
EP - 861
BT - Future Material Research and Industry Application, FMRIA 2011
T2 - 2011 SSITE International Conference on Future Material Research and Industry Application, FMRIA 2011
Y2 - 1 December 2011 through 2 December 2011
ER -