TY - JOUR
T1 - A hetero-photoautotrophic two-stage cultivation process to improve wastewater nutrient removal and enhance algal lipid accumulation
AU - Zhou, Wenguang
AU - Min, Min
AU - Li, Yecong
AU - Hu, Bing
AU - Ma, Xiaochen
AU - Cheng, Yanling
AU - Liu, Yuhuan
AU - Chen, Paul
AU - Ruan, Roger
PY - 2012/4/1
Y1 - 2012/4/1
N2 - A hetero-photoautotrophic algal growth model was studied for improved wastewater treatment and low cost algal biofuel feedstock production. The microalga, Auxenochlorella protothecoides UMN280, was grown heterotrophically on concentrated municipal wastewater and then autotrophically with CO 2 supplementation (air, 1% and 5%, respectively). Strain UMN280 was harvested by self-sedimentation after the heterotrophic stage and the supernatant was aerated with different levels of CO 2 to facilitate autotrophic growth in the second stage. The maximal biomass concentration and lipid content at the first and second stages reached 1.12g/L and 28.90%, and 1.16g/L and 33.22%, respectively. The nutrient removal efficiencies for total phosphorus, ammonia, nitrogen and chemical oxygen demand at the end of the two-stage cultivation were 98.48%, 100%, 90.60% and 79.10%, respectively. The above process can be used to treat organic-rich wastewaters (e.g. industrial and animal manure wastewaters) to achieve the dual purpose of low-cost wastewater treatment and biofuel feedstock production.
AB - A hetero-photoautotrophic algal growth model was studied for improved wastewater treatment and low cost algal biofuel feedstock production. The microalga, Auxenochlorella protothecoides UMN280, was grown heterotrophically on concentrated municipal wastewater and then autotrophically with CO 2 supplementation (air, 1% and 5%, respectively). Strain UMN280 was harvested by self-sedimentation after the heterotrophic stage and the supernatant was aerated with different levels of CO 2 to facilitate autotrophic growth in the second stage. The maximal biomass concentration and lipid content at the first and second stages reached 1.12g/L and 28.90%, and 1.16g/L and 33.22%, respectively. The nutrient removal efficiencies for total phosphorus, ammonia, nitrogen and chemical oxygen demand at the end of the two-stage cultivation were 98.48%, 100%, 90.60% and 79.10%, respectively. The above process can be used to treat organic-rich wastewaters (e.g. industrial and animal manure wastewaters) to achieve the dual purpose of low-cost wastewater treatment and biofuel feedstock production.
KW - Biofuel production
KW - Facultative heterotrophic microalgae
KW - Hetero-photoautotrophic cultivation
KW - Municipal wastewater
UR - http://www.scopus.com/inward/record.url?scp=84858283088&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84858283088&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2012.01.063
DO - 10.1016/j.biortech.2012.01.063
M3 - Article
C2 - 22326332
AN - SCOPUS:84858283088
VL - 110
SP - 448
EP - 455
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -