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KMID : 0364820120480030192
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Korean Journal of Microbiology
2012 Volume.48 No. 3 p.192 ~ p.199
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Municipal Wastewater Treatment and Microbial Diversity Analysis of Microalgal Mini Raceway Open Pond
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Kang Zi-on
Kim Byung-Hyuk
Shin Sang-Yoon
Oh Hee-Mock
Kim Hee-Sik
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Abstract
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Microalgal biotechnology has gained prominence because of the ability of microalgae to produce value?added
products including biodiesel through photosynthesis. However, carbon and nutrient source is often a limiting factor
for microalgal growth leading to higher input costs for sufficient biomass production. Use of municipal wastewater
as a low cost alternative to grow microalgae as well as to treat the same has been demonstrated in this study using
mini raceway open ponds. Municipal wastewater was collected after primary treatment and microalgae indigenous in
the wastewater were encouraged to grow in open raceways under optimum conditions. The mean removal
efficiencies of TN, TP, COD-Mn, NH3-N after 6 days of retention time was 80.18%, 63.56%, 76.34%, and 96.74%
respectively. The 18S rRNA gene analysis of the community revealed the presence of Chlorella vulgaris and
Scenedesmus obliquus as the dominant microalgae. In addition, 16S rRNA gene analysis demonstrated that
Rhodobacter, Luteimonas, Porphyrobacter, Agrobacterium, and Thauera were present along with the microalgae.
From these results, it is concluded that microalgae could be used to effectively treat municipal wastewater without
aerobic treatment, which incurs additional energy costs. In addition, municipal wastewater shall also serve as an
excellent carbon and nitrogen source for microalgal growth. Moreover, the microalgal biomass shall be utilized for
commercial purposes
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KEYWORD
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microalgae, microbial diversity, open culture system, wastewater treatment
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