“…Most chemical processes emit greenhouse gases Chen et al, 2007;Chiou et al, 2006;Ghoneim and Aboul-Gheit, 2007;Hacifazlioglu and Sutcu, 2007;He et al, 2007;Hung and Rei, 2007;Kasim et al, 2007;Kim et al, 2006;Li and Teng, 2007;Shih, 2006, 2007;Ma et al, 2007;Matsuda et al, 2006;Monyanon et al, 2007;Otawara and Kitamura, 2006;Sutcu, 2007;Wang and Chen, 2007;Liu, 2007a, 2007b;Wei et al, 2007;Wu and You, 2007;Wu et al, 2006;Yao et al, 2007;Yeh, 2007;Yu et al, 2007a,b,c). A scenario on emission reduction based on a methane recovery and utilisation from a granular-sludge-based anaerobic treatment system is discussed in this paper.…”