2019 ; Vol.29-9: 1434~1443
|Author||Sang-Ah Lee, Nakyeong Lee, Hee-Mock Oh, Chi-Yong Ahn|
|Place of duty||Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,Department of Environmental Biotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), Daejeon 34113, Republic of Korea|
|Title||Enhanced and Balanced Microalgal Wastewater Treatment (COD, N, and P) by Interval Inoculation of Activated Sludge|
J. Microbiol. Biotechnol.2019 ;
|Abstract||Although chemical oxygen demand (COD) is an important issue for wastewater treatment,
COD reduction with microalgae has been less studied compared to nitrogen or phosphorus
removal. COD removal is not efficient in conventional wastewater treatment using
microalgae, because the algae release organic compounds, thereby finally increasing the COD
level. This study focused on enhancing COD removal and meeting the effluent standard for
discharge by optimizing sludge inoculation timing, which was an important factor in forming
a desirable algae/bacteria consortium for more efficient COD removal and higher biomass
productivity. Activated sludge has been added to reduce COD in many studies, but its
inoculation was done at the start of cultivation. However, when the sludge was added after 3
days of cultivation, at which point the COD concentration started to increase again, the algal
growth and biomass productivity were higher than those of the initial sludge inoculation and
control (without sludge). Algal and bacterial cell numbers measured by qPCR were also higher
with sludge inoculation at 3 days later. In a semi-continuous cultivation system, a hydraulic
retention time of 5 days with sludge inoculation resulted in the highest biomass productivity
and N/P removal. This study achieved a further improved COD removal than the
conventional microalgal wastewater treatment, by introducing bacteria in activated sludge at
|Key_word||COD, microalgae, activated sludge, wastewater, bacteria|
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