Ultraviolet radiation pre-treatment modifies dairy wastewater, improving its utility as a medium for algal cultivation

摘要: Abstract Dairy wastewaters can be remediated through assimilation of nutrients into algal biomass, providing upcycling valuable products. Unfortunately, these are non-ideal for phototrophic organisms; high levels dissolved organic matter (DOM) and heterotrophic microbial organisms result in limited light nutrient availability. Ultraviolet (UV) radiation modify aquatic systems, changing DOM quantity quality lowering densities. We hypothesized that dairy wastewater would similarly modified by UV radiation, allowing improved growth. Two distinct wastewaters, anaerobic digester effluent (ADE) polyhydroxyalkanoate reactor (PHAE) were investigated. pre-treatment ADE resulted growth kinetics Chlorella vulgaris , increasing exponential rates up to 4 fold decreasing time stationary phase 8 days. PHAE no effects C. . A fluence 1892.7 mW·s·cm − 2 reduced bacteria colony forming units 99% 100% respectively, fluorescent DOM, attenuation both effluents. These findings suggest successfully modifies enhances ADE's utility as a medium improving the economics waste-to-algae process, potential recycling from agricultural waste.