%L scholars20521 %R 10.3390/pr8010039 %J Processes %A Wei Ling Chow %A Siewhui Chong %A Jun Wei Lim %A Yi Jing Chan %A Mei Fong Chong %A Timm Joyce Tiong %A Jit Kai Chin %A Guan-Ting Pan %N 1 %T Anaerobic co-digestion of wastewater sludge: A review of potential co-substrates and operating factors for improved methane yield %O Cited by: 161; All Open Access; Gold Open Access; Green Open Access %V 8 %D 2020 %I Multidisciplinary Digital Publishing Institute (MDPI)