0 votes 0 votes The most important type of species involved in the degradation of organic matter in the case of activated sludge process is autotrophs heterotrophs prototrophs photo-autotrophs Water and Waste Water Quality and Treatment gate2017-ce-2 water-and-waste-water-quality-and-treatment environmental-engineering sludge-disposal activated-sludge-process + – gatecse asked Aug 7, 2019 • edited May 25, 2021 by Chandanachandu gatecse 4.0k points answer See all 0 reply