Microalgae are highly versatile in their metabolism. Some are “photoautotrophic,” meaning that, like plants, they use light as energy and CO2<\/sub> as a carbon source in photosynthesis. “Heterotrophic” microalgae, like many bacteria, use dissolved organic substance as the energy and carbon source for their metabolism. Finally, “mixotrophic” microalgae are capable of both photoautotrophic and heterotrophic types of metabolism.<\/p>\n During autumn and winter in Northern countries, light intensity is low and daytime is short, resulting in lower photoautotrophic production than in spring and summer. Mixotrophic metabolism, which supplies more energy for microalgae by organic carbon addition, can compensate for the photoautotrophic growth reduction in autumns and winters.<\/p>\n In this case study, we investigate the nutrient recovery by mixotrophic algae cultivation in landfill leachate (nitrogen fertilizer) mixed with dairy wastewater (phosphorus and organic carbon sources) in high rate algal ponds in winters and autumns. The algal ponds (see the photo) are 1 cubic meter and located in a green house in the backyard of KalmarEnergi in Moskogen where flue gas and leachate are readily available. This mixotrophic mode showed higher nutrient removal rate than photoautotrophic culture in similar cultivation conditions.<\/p>\n -Quyen Nham<\/p>\n <\/p>\n References<\/strong><\/p>\n Benemann, J. (2013). Microalgae for biofuels and animal feeds.\u00a0Energies<\/em>,\u00a06<\/em>(11), 5869-5886.<\/p>\n Cai, T., Park, S. Y., & Li, Y. (2013). Nutrient recovery from wastewater streams by microalgae: status and prospects.\u00a0Renewable and Sustainable Energy Reviews<\/em>,\u00a019<\/em>, 360-369.<\/p>\n Chen, Y., Xu, C., & Vaidyanathan, S. (2018). Microalgae: a robust \u201cgreen bio-bridge\u201d between energy and environment.\u00a0Critical reviews in biotechnology<\/em>,\u00a038<\/em>(3), 351-368.<\/p>\n Chojnacka, K., & Marquez-Rocha, F. J. (2004). Kinetic and stoichiometric relationships of the energy and carbon metabolism in the culture of microalgae.\u00a0Biotechnology<\/em>,\u00a03<\/em>(1), 21-34.<\/p>\n Ferro, L., Gorzs\u00e1s, A., Gentili, F. G., & Funk, C. (2018). Subarctic microalgal strains treat wastewater and produce biomass at low temperature and short photoperiod.\u00a0Algal research<\/em>,\u00a035<\/em>, 160-167.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Eutrophication, due to nutrient discharge from wastewater into the environment, results in damages to the ecological systems. Nutrient recovery is required to reduce eutrophication and to utilize wastewater as resources in sustainability. Microalgae, microscopic photosynthetic organisms, efficiently take up nutrients and CO2 into their biomass via their metabolism. By cultivating microalgae in wastewater with a […]<\/p>\n","protected":false},"author":19887,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,68922],"tags":[70213,71888,6,70527,71743,71207,70886,71462],"class_list":["post-137","post","type-post","status-publish","format-standard","hentry","category-blogg","category-cleaning-the-water","tag-algoland","tag-kalmarenergi","tag-linneuniversitetet","tag-microalgae","tag-moskogen","tag-nutrient-mitigation","tag-sustainable-solutions","tag-wastewater"],"acf":[],"yoast_head":"\r\n![\"\"](\"https:\/\/blogg.lnu.se\/algoland\/files\/2021\/02\/Algoland_Raceway-ponds.jpg\")
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