0 votes 0 votes A biological process is involved in the __________ treatment of industrial effluent. primary secondary tertiary quaternary Others gate2016 + – Milicevic3306 asked Mar 26, 2018 edited Dec 4, 2020 by go_editor Milicevic3306 7.9k points answer comment Share Follow See all 0 reply Please log in or register to add a comment.