BioChem - DOS

Cultivation of Chlorella vulgaris on wastewater containing high levels of ammonia for biodiesel production

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

He, P.J.; Mao, B.; Shen, C.M.; Shao, L.M.; Lee, D.J.; Chang, J.S.

The feasibility of cultivating Chlorella vulgaris with wastewater containing high ammonia nitrogen concentrations was examined. The average specific growth rate of C. vulgaris was 0.92d<SUP>-1</SUP> at 17mgL<SUP>-1</SUP> NH<SUB>4</SUB><SUP>+</SUP>-N, but declined to 0.33d<SUP>-1</SUP> at NH<SUB>4</SUB><SUP>+</SUP>-N concentrations of 39-143mgL<SUP>-1</SUP>. At 39mgL<SUP>-1</SUP> NH<SUB>4</SUB><SUP>+</SUP>-N, lipid productivity reached a maximum value (23.3mgL<SUP>-1</SUP>d<SUP>-1</SUP>) and dropped sharply at higher NH<SUB>4</SUB><SUP>+</SUP>-N levels, which demonstrated NH<SUB>4</SUB><SUP>+</SUP>-N should be controlled for biodiesel production. C16 and C18 fatty acids accounted for 80% of total fatty acids. Increasing NH<SUB>4</SUB><SUP>+</SUP>-N from 17 to 207mgL<SUP>-1</SUP> yielded additional short-chain and saturated fatty acids. Protein content was in positive correlation with NH<SUB>4</SUB><SUP>+</SUP>-N content from 17mgL<SUP>-1</SUP> (12%) to 207mgL<SUP>-1</SUP> (42%). Carbohydrate in the dried algae cell was in the range of 14-45%, with a peak value occurring at 143mgL<SUP>-1</SUP> NH<SUB>4</SUB><SUP>+</SUP>-N. The results demonstrate that product quality can be manipulated by NH<SUB>4</SUB><SUP>+</SUP>-N concentrations of the initial feeds.

2013

Elsevier Applied Science

0960-8524

129

pp.177-181

10.1016/j.biortech.2012.10.162

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART65520718

Wastewater treatment; Chlorella vulgaris; Biodiesel production; Fatty acids; Ammonia