Outbreaks of cyanobacterial harmful algal blooms present a serious threat to ecosystem safety and human well-being. Removal of toxic cyanobacterial biomass from freshwaters and its safe utilization is a worldwide problem. We showed that regulation of intracellular carbon flow by applying nitrogen deprivation strategy with light and inorganic carbon manipulation during the cultivation of cyanobacterium Microcystis allows efficiently convert its biomass into the biofuel feedstock. The proteomic analysis demonstrated that highly efficient feedstock production can be achieved during Microcystis culturing by nitrogen deprivation, which slows down the catabolic consumption of carbohydrates in cells. Further, we developed a novel approach that allows converting the natural Microcystis biomass into carbohydrate-rich feedstock by maintaining a high rate of carbohydrate production at minimal biomass losses. The yield attains 0.22 g ethanol per gram dry biomass, which is in the range of the ethanol yield of sugarcane, but higher than the values of sugarcane waste. The suggested approach provides cost-effective technology for sustainable green energy production from nuisance cyanobacterial biomass. The massive removal of toxic cyanobacterial biomass for bioethanol productions can mitigate the harmful cyanobacterial blooms in eutrophic lakes, and positively affect their restoration.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China [Grant numbers 42077308 , 41601532 , 91951104 ]; the binational program of National Science Foundation of China and Israel Science Foundation [ ISF Grant 2033/15 ]; and the Israel Ministry of Science and Technology [MOST grant 3-14952 ]. We thank the editor and anonymous reviewers for their constructive comments, which helped us to improve the manuscript.
© 2021 Elsevier Ltd
- Bioenergy production
- Carbon flows
- Cyanobacterial blooms
- Renewable resources
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment