20% to 80% algae-to-sludge mix, respectively. Moreover, the Net Energy Recovery during co-digestion reached 39% compared to 26 and 33% when algae or sewage sludge were processed as single-substrates. Thus, co-digestion of algae with sewage sludge serves as an attractive option for maximizing energy gain from AD of biomass harvested from filamentous algal treatment systems.
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