Mixotrophy in Synechocystis sp. for the treatment of wastewater with high nutrient content: effect of CO2 and light

Bioprocess and Biosystems Engineering - Tập 42 - Trang 1661-1669 - 2019
Giulia Trentin1,2, Alberto Bertucco2, Eleonora Sforza1,2
1Interdepartmental Centre Giorgio Levi Cases, University of Padova, Padua, Italy
2Department of Industrial Engineering DII, University of Padova, Padua, Italy

Tóm tắt

Synechocystis sp. has remarkable mixotrophic capabilities, as well as an efficient exploitation of nitrogen and phosphorus, that may be applied in wastewater treatment based on cyanobacteria. To better investigate the exploitation of algal mixotrophy in bioremediation, this species was used in axenic respirometric tests to ascertain the effect of high light and non limiting CO2 supply on the overall regulation of mixotrophy, resulting in an inhibition of the exploitation of organic carbon. The same species was then cultured in real, unsterilized effluent obtained from the acidogenic fermentation of sludge, which contains a high concentration of nutrients (approximately 600, 90 and 6000 mg L−1 of N, P and COD, respectively) and it is often inhibiting for many microalgal species. On the contrary, Synechocystis sp., showed a remarkable growth and a removal up to 96% of phosphorus, 66% of nitrogen and of 68% of COD in such a complex waste stream.

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