Treatment and Valorization of Agro-Industrial Anaerobic Digestate Using Activated Carbon Followed by Spirulina platensis Cultivation

The increased production of biogas through the anaerobic digestion (AD) process has raised several concerns regarding management liquid digestate, which can present some environmental risks if not properly handled. Among different techniques to treat AD microalgae and cyanobacteria cultivation emerged as a sustainable approach valorizing digestate while producing valuable biomass for biofuels high value bioproducts. However, intrinsic parameters strongly limit or growth well uptake residual nutrients. In this study, detoxification potential activated carbon (AC) was evaluated on agro-industrial prior Spirulina platensis cultivation. Different doses AC, ranging from 5 100 g/L, were tested during adsorption experiments in order determine capacity removal efficiency compounds. Experimental results showed reactivity especially towards phosphate (PO4-P), total phenol (TP) chemical oxygen demand (COD). At dosage 50 AC pretreatment successfully achieved 54.7%, 84.7% 50.0% COD, TP PO4-P removal, corresponding 94.7 mgDCO/g, 17.9 mgTP/g 8.7 mgPO4-P/g, respectively. Even did show significant effects toxicity assays, step participated by removing hardly biodegradable molecules such phenolic