Table 5.
There are many excellent reviews available on the topic of dewatering, relating to: development of rheological tools to predict performance (Stickland, 2015); quantification of (Skinner et al., 2015); limitations of (Vesilind and Hsu, 1997); performance overview (Christensen et al., 2015); even the influence of thermal hydrolysis itself (Neyens and Baeyens, 2003) and the interested reader is referred to those texts.
According to Neyens et al. (2004) advanced SRT 1720 pre-treatment technology improves dewaterability in two ways, (i) the degradation of proteins and polysaccharides from within extracellular polymeric substances (EPS) thereby reducing its water retaining capacity (Barjenbruch and Kopplow, 2003, Neyens et?al., 2004 and Chu et?al., 2002); and (ii) promotion of flocculation which reduces the amount of fine flocs (Bougrier et al., 2008).
Nevertheless, as well as destroying ECP, thermal hydrolysis influences a variety of other parameters which also influence dewaterability such as: viscosity which is inversely correlated to increasing thermal hydrolysis reaction temperature (Everett and Brooks, 1971; Everett, 1972, Haug et?al., 1978 and Higgins et?al., 2015); increased dry solids (loading rate) resulting in higher compressive yield stress (Stickland, 2015); particle size and distribution (Neyens et?al., 2004 and Hendriks and Zeeman, 2009); and protein solubility which influences polymer consumption (Hung-Wei et al., 2014; Murthy et al., 1997), amongst others.
There are many excellent reviews available on the topic of dewatering, relating to: development of rheological tools to predict performance (Stickland, 2015); quantification of (Skinner et al., 2015); limitations of (Vesilind and Hsu, 1997); performance overview (Christensen et al., 2015); even the influence of thermal hydrolysis itself (Neyens and Baeyens, 2003) and the interested reader is referred to those texts.
According to Neyens et al. (2004) advanced SRT 1720 pre-treatment technology improves dewaterability in two ways, (i) the degradation of proteins and polysaccharides from within extracellular polymeric substances (EPS) thereby reducing its water retaining capacity (Barjenbruch and Kopplow, 2003, Neyens et?al., 2004 and Chu et?al., 2002); and (ii) promotion of flocculation which reduces the amount of fine flocs (Bougrier et al., 2008).
Nevertheless, as well as destroying ECP, thermal hydrolysis influences a variety of other parameters which also influence dewaterability such as: viscosity which is inversely correlated to increasing thermal hydrolysis reaction temperature (Everett and Brooks, 1971; Everett, 1972, Haug et?al., 1978 and Higgins et?al., 2015); increased dry solids (loading rate) resulting in higher compressive yield stress (Stickland, 2015); particle size and distribution (Neyens et?al., 2004 and Hendriks and Zeeman, 2009); and protein solubility which influences polymer consumption (Hung-Wei et al., 2014; Murthy et al., 1997), amongst others.