Promotion of nitrification by co-culture of algae and nitrifying bacteria in biogas digestate and its conversion into fertilizer

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K12246
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental conscious materials and recycle
• Research Institution: Osaka Prefecture University
• Principal Investigator: Kitaya Yoshiaki 大阪府立大学, 生命環境科学研究科, 教授 (60169886)
• Co-Investigator(Kenkyū-buntansha): 遠藤 良輔 大阪府立大学, 生命環境科学研究科, 講師 (10409146)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: メタン発酵消化液

Outline of Final Research Achievements

Growth performances of E. gracilis and L. sativa co-cultured using a biogas digestate were investigated. This solution simulated the filtrate of nitrified biogas digestate derived from the organic fraction of municipal solid waste but was supplemented with insufficient plant nutrients (Mg, Fe and Mn). The specific growth rate of the co-cultured E. gracilis was the same rate that E. gracilis achieved when grown as a sole culture. There were no significant differences between L. sativa cultured with E. gracilis until the stationary growth phase of E. gracilis was reached and those cultured alone relative to biomass. These results suggest that E. gracilis and L. sativa could be co-cultured with the biogas digestate after being nitrified and filtered. In addition, considering concentrations of plant macronutrients in the residual solution after the co-culturing E. gracilis and L. sativa, it could be re-used as the nutrient solution for co-culturing E. gracilis and L. sativa.

Free Research Field

生態工学