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Int. J. Environ. Res. Public Health 2018, 15(3), 434; doi:10.3390/ijerph15030434

The Performance of a Self-Flocculating Microalga Chlorococcum sp. GD in Wastewater with Different Ammonia Concentrations

School of Life Science, Shanxi University, Taiyuan 030006, China
Institute of Agricultural Environment and Resource, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
Author to whom correspondence should be addressed.
Received: 22 January 2018 / Revised: 12 February 2018 / Accepted: 27 February 2018 / Published: 2 March 2018
(This article belongs to the Special Issue Municipal Wastewater Treatment)
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The performance of a self-flocculating microalga Chlorococcum sp. GD on the flocculation, growth, and lipid accumulation in wastewater with different ammonia nitrogen concentrations was investigated. It was revealed that relative high ammonia nitrogen concentration (20–50 mg·L−1) was beneficial to the flocculation of Chlorococcum sp. GD, and the highest flocculating efficiency was up to 84.4%. It was also found that the highest flocculating efficiency occurred in the middle of the culture (4–5 days) regardless of initial ammonia concentration in wastewater. It was speculated that high flocculating efficiency was likely related to the production of extracellular proteins. 20 mg·L−1 of ammonia was found to be a preferred concentration for both biomass production and lipid accumulation. 92.8% COD, 98.8% ammonia, and 69.4% phosphorus were removed when Chlorococcum sp. GD was cultivated in wastewater with 20 mg·L−1 ammonia. The novelty and significance of the investigation was the integration of flocculation, biomass production, wastewater treatment, and lipid accumulation, simultaneously, which made Chlorococcum sp. GD a potential candidate for wastewater treatment and biodiesel production if harvested in wastewater with suitable ammonia nitrogen concentration. View Full-Text
Keywords: ammonia nitrogen; biomass production; lipid accumulation; wastewater treatment; self-flocculation ammonia nitrogen; biomass production; lipid accumulation; wastewater treatment; self-flocculation

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Lv, J.; Wang, X.; Liu, W.; Feng, J.; Liu, Q.; Nan, F.; Jiao, X.; Xie, S. The Performance of a Self-Flocculating Microalga Chlorococcum sp. GD in Wastewater with Different Ammonia Concentrations. Int. J. Environ. Res. Public Health 2018, 15, 434.

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