Poinapen J, Wentzel M, Ekama GE. Biological sulphate reduction with primary sewage sludge in an upflow anaerobic sludge bed (UASB) reactor – Part 1: Feasibility study. WSA [Internet]. 2009 Dec. 15 [cited 2026 Sep. 8];35(5). Available from: https://www.ajol.info/index.php/wsa/article/view/49178