Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction

Figures & data

Figure 1. Schematic of the experimental setup.

Table 1. Physicochemical characteristics of sewage sludge

Item	Content	Average
Proximate analysis (wt%)	Moisture	83.46
	Volatile	11.83
	Fixed-C	3.45
	Ash	1.26
Ultimate analysis (dry basis, wt%)	Carbon (%)	37.78
	Hydrogen (%)	5.54
	Oxygen (%)	20.58
	Nitrogen (%)	6.88
	Sulfur (%)	0.34
Particle size (μm)		354
High heating value (kcal/kg)		3961.9

Figure 2. Photographs of physical properties related to thermal hydrolysis reaction: (a) raw; (b) 80 °C; (c) 100 °C; (d) 130 °C; (e) 150 °C; (f) 170 °C; (g) 190 °C; (h) 200 °C.

Figure 3. Temperature difference profiles of water and dewatered sludge versus reaction temperature: (a) water; (b) dewatered sludge.

Figure 4. Comparison of the temperature differences (ΔT) of water and dewatered sludge: (a) temperature difference (°C); (b) integrated electric power (kWhr).

Figure 5. Comparison of thermal conductivities of water and dewatered sludge.

Figure 6. Comparison of calculated and measured thermal conductivities of dewatered sludge.