Menikea KK, Kyprianou A, Samanides CG, Georgiou SG, Koutsokeras L, Constantinides G, Vyrides I. Anaerobic granular sludge and zero valent scrap iron (ZVSI) pre-treated with green tea as a sustainable system for conversion of CO2 to CH4. Journal of Cleaner Production [Internet]. 2020;268.