Effects of exogenous GR24 on biogas upgrading and nutrient removal by co-culturing microalgae with fungi under mixed LED light wavelengths. (October 2021)

• Record Type: Journal Article
• Authors: Zhang, Wenguang; Zhao, Chunzhi; Liu, Juan; Sun, Shiqing; Zhao, Yongjun; Wei, Jing
• Is Part Of: Chemosphere. Volume 281(2021)
• Publication Date: 2021-10
• Subjects: Pelletization -- Strigolactone -- Photosynthetic characteristic -- Nutrient removal -- CO2 removal; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130791
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: To realize the synchronous purification of raw biogas and biogas slurry, the algal-fungal symbiont pellets were cultivated by supplementing strigolactone (GR24) under different mixed LED light wavelengths. The optimal light intensity was proved to be red and blue in the ratio of 5:5. The symbionts treated with 10 −9 M GR24 had the highest growth rate and mean daily productivity. The extracellular carbonic anhydrase activity and the content of chlorophyll were also affected by GR24 concentrations and mixed light wavelengths. With the induction of 10 −9 M GR24, the maximum removal efficiency of chemical oxygen demand, total nitrogen, and total phosphorus reached 76.35 ± 6.87%, 78.77 ± 7.13% and 79.49 ± 7.43%, respectively. Besides, the CO2 removal efficiency reached 59.32 ± 5.19% when the concentration of GR24 was 10 −7 M. This work will be beneficial for large-scale biogas slurry purification and biogas upgrading using co-cultivation of microalgae and fungi. Graphical abstract: Image 1 Highlights: The light intensity ratio of red: blue of 5:5 performed the best. The optimal GR24 concentration was between 10 −9 -10 −7 M. Nutrient removal efficiencies were approximately 80% under GR24 induction. The maximum CO2 removal efficiencies were 10 −7 M GR24 induction. GR24 significantly improved photosynthetic performance of algal-fugal symbiont.