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KMID : 1024520210300020161
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Journal of the Environmental Sciences
2021 Volume.30 No. 2 p.161 ~ p.172
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Impact of Environmental Factors on Phosphorus Removal of Bacillus licheniformis Isolated from Domestic Sewage
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Han Seok-Soon
Park Sang-Wook
Kim Deok-Won
Park Ji-Su
Oh Eun-Ji
Yoo Jin
Kim Deok-Hyeon
Chung Keun-Yook
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Abstract
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This study was initiated to isolate the microorganisms removing phosphorus (P) from domestic sewage and to investigate the effects of environmental factors on the growth and P removal of the isolated bacteria. Microorganisms isolated from the sewage were identified as Chryseobacterium sp., Stenotrophomonas maltophilia, and Bacillus licheniformis. Among them, Bacillus licheniformis was selected as the P removal microorganism. The environmental factors considered in this study included initial phosphorus concentration, temperature, pH, and carbon source. At initial P concentrations of 10, 20, and 30 mg/L, the P removal efficiencies were 100.0%, 84.0%, and 16.5%, respectively. At 20°C, 30°C, and 40°C, the P removal efficiencies were 0%, 75.8%, and 60.6%, respectively. The removal efficiencies of phosphorus according to pH were 1.6%, 91.7%, and 51.1% at pH 5, pH 7, and pH 9, respectively. Using glucose, acetate, and glucose + acetate as carbon sources yielded P removal efficiencies of 80.9%, 33.6%, and 54.1%, respectively. Therefore, the results from the study demonstrated that the P removal efficiencies of Bacillus licheniformis were the highest when the initial P concentration, temperature, pH, and carbon source were 10 mg/L, 30°C, 7, and glucose, respectively.
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KEYWORD
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Bacillus licheniformis, Isolation, Phosphorus removal efficiency, Environmental factor, optimal conditions
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