Print Email Facebook Twitter Light intensity defines growth and photopigment content of a mixed culture of purple phototrophic bacteria Title Light intensity defines growth and photopigment content of a mixed culture of purple phototrophic bacteria Author Cerruti, M. (TU Delft BT/Environmental Biotechnology) Kim, J.H. (Student TU Delft) Pabst, Martin (TU Delft BT/Environmental Biotechnology) van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology) Weissbrodt, D.G. (TU Delft BT/Environmental Biotechnology) Date 2022 Abstract Purple bacteria (PPB), anoxygenic photoorganoheterotrophic organisms with a hyper-versatile metabolism and high biomass yields over substrate, are promising candidates for the recovery of nutrient resources from wastewater. Infrared light is a pivotal parameter to control and design PPB-based resource recovery. However, the effects of light intensities on the physiology and selection of PPB in mixed cultures have not been studied to date. Here, we examined the effect of infrared irradiance on PPB physiology, enrichment, and growth over a large range of irradiance (0 to 350 W m−2) in an anaerobic mixed-culture sequencing batch photobioreactor. We developed an empirical mathematical model that suggests higher PPB growth rates as response to higher irradiance. Moreover, PPB adapted to light intensity by modulating the abundances of their phototrophic complexes. The obtained results provide an in-depth phylogenetic and metabolic insight the impact of irradiance on PPB. Our findings deliver the fundamental information for guiding the design of light-driven, anaerobic mixed-culture PPB processes for wastewater treatment and bioproduct valorization. Subject anaerobic wastewater treatmentwater resource recoveryPNSBirradiance effectspigments To reference this document use: http://resolver.tudelft.nl/uuid:84a6d145-6ad1-46f2-b3ff-af4bc95916bd DOI https://doi.org/10.3389/fmicb.2022.1014695 ISSN 1664-302X Source Frontiers in Microbiology, 13 Part of collection Institutional Repository Document type journal article Rights © 2022 M. Cerruti, J.H. Kim, Martin Pabst, Mark C.M. van Loosdrecht, D.G. Weissbrodt Files PDF fmicb_13_1014695.pdf 4.41 MB Close viewer /islandora/object/uuid:84a6d145-6ad1-46f2-b3ff-af4bc95916bd/datastream/OBJ/view