TY - JOUR
T1 - Characteristics of wastewater treatment by Chlorella sorokiniana and comparison with activated sludge
AU - Fan, Jie
AU - Cao, Liang
AU - Gao, Cheng
AU - Chen, Yue
AU - Zhang, Tian C.
N1 - Publisher Copyright:
© 2019 IWA Publishing. All rights reserved.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Characteristics of Chlorella sorokiniana treating wastewater with consideration of HRT (6 d, 16 h, 8 h), hydraulic conditions, light or dark culture were evaluated and compared with activated sludge. Results showed that optimal HRT was 8 h; if longer, effluent chemical oxygen demand (COD) and NHj-N in the dark began to rebound. Mixing was beneficial to COD removal of algae, while aeration was suitable for nutrient removal. Growth of C. sorokiniana in the light was mixotrophic growth and 1.3-1.7 times more than that of dark heterotrophic growth. The maximum specific growth rate (µmax), productivity, and biomass yields on COD (YCOD), N (YNH4), P (YP) of algae were higher in the light than that in the dark. COD assimilation capacity of algae was similar to activated sludge but with different dynamics. N and P assimilation capacity of algae was 1.4,1.2-2.5 times more than activated sludge; N and P removal efficiency of algae was 5%-10%, 10%-55% respectively higher than activated sludge. This study confirmed the advantage of algae over activated sludge and reveal why algae could assist the activated sludge process.
AB - Characteristics of Chlorella sorokiniana treating wastewater with consideration of HRT (6 d, 16 h, 8 h), hydraulic conditions, light or dark culture were evaluated and compared with activated sludge. Results showed that optimal HRT was 8 h; if longer, effluent chemical oxygen demand (COD) and NHj-N in the dark began to rebound. Mixing was beneficial to COD removal of algae, while aeration was suitable for nutrient removal. Growth of C. sorokiniana in the light was mixotrophic growth and 1.3-1.7 times more than that of dark heterotrophic growth. The maximum specific growth rate (µmax), productivity, and biomass yields on COD (YCOD), N (YNH4), P (YP) of algae were higher in the light than that in the dark. COD assimilation capacity of algae was similar to activated sludge but with different dynamics. N and P assimilation capacity of algae was 1.4,1.2-2.5 times more than activated sludge; N and P removal efficiency of algae was 5%-10%, 10%-55% respectively higher than activated sludge. This study confirmed the advantage of algae over activated sludge and reveal why algae could assist the activated sludge process.
KW - Activated sludge
KW - Chlorella sorokiniana
KW - HRT
KW - Light and dark
KW - Wastewater treatment
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U2 - 10.2166/wst.2019.329
DO - 10.2166/wst.2019.329
M3 - Article
C2 - 31746796
AN - SCOPUS:85075286648
SN - 0273-1223
VL - 80
SP - 892
EP - 901
JO - Water Science and Technology
JF - Water Science and Technology
IS - 5
ER -