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DOI: https://doi.org/10.4491/eer.2018.442
Growth and nutrient removal of Chlorella vulgaris in ammonia-reduced raw and anaerobically-digested piggery wastewaters
Gyutae Kwon1, Ji-Hyun Nam2, Dong-Min Kim1, Chulwoo Song3, and Deokjin Jahng1
1Department of Environmental Engineering and Energy, Myongji University, Yongin 17058, Republic of Korea
2Water Supply and Sewerage Research Division, National Institute of Environmental Research, Incheon 22689, Republic of Korea
3Bukangtech Co. Ltd., Daejeon 34109, Republic of Korea
Corresponding Author: Deokjin Jahng ,Tel: +82-31-330-6690, Fax: +82-31-336-6336, Email: djahng@mju.ac.kr
Received: December 20, 2018;  Accepted: March 13, 2019.
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ABSTRACT
This study was aimed to investigate the possibility of using raw and anaerobically-digested piggery wastewater as culture media for a green microalga Chlorella vulgaris (C. vulgaris). Due to high concentration of ammonia and dark color, the microalga did not grow well in this wastewater. In order to solve this problem, air stripping and NaOCl-treatment were applied to reduce the concentration of NH3-N and the color intensity from the wastewater. Algal growth was monitored in terms of specific growth rate, biomass productivity, and nutrient removal efficiency. As a result, C. vulgaris grew without any sign of inhibition in air-stripped and 10-folds diluted anaerobically-digested piggery wastewater with enhanced biomass productivity of 0.57 g/L·d and nutrient removal of 98.7-99.8% for NH3-N and 41.0-62.5% for total phosphorus. However, NaOCl-treatment showed no significant effect on growth of C. vulgaris, although dark color was removed greatly. Interestingly, despite that the soluble organic concentration after air stripping was still high, the biomass productivity was 4.4 times higher than BG-11. Moreover, air stripping was identically effective for raw piggery wastewater as for anaerobic digestate. Therefore, it was concluded that air stripping was a very effective method for culturing microalgae and removing nutrients from raw and anaerobically-digested piggery wastewaters.
Keywords: Air stripping | Ammonia | Anaerobic digestate of piggery wastewater | Biomass productivity | Chlorella vulgaris | Nutrient removal
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