carried out in a 1 L glass bottle, while the fermentation temperature was maintained at 37 C using a water bath. The bottles were swayed 3 times for 2 min per day where after the gas production was tested. This process continued until no gas could be detected.
2.2.2. Relationship between various pressure reduction differentials and the digestion capabilities of excess sludge after thermal hydrolysis
The pressure differentials (0.7–0, 0.7–0.1, 0.6–0.1, 0.5–0.1, 0.4–0.1 Mpa) were adjusted to carry out experiments of thermal hydrolysis with an excess sludge feed concentration of 11 wt-%, thermal hydrolyzing temperature of 170 C, reaction time of 30 min (a–b MPa: a represents the pressure differential between the thermal hydrolysis reactor and the first-stage pressure reduction tank while b is the pressure differential between the first-stage pressure reduction tank and the second-stage pressure reduction tank).
carried out in a 1 L glass bottle, while the fermentation temperature was maintained at 37 C using a water bath. The bottles were swayed 3 times for 2 min per day where after the gas production was tested. This process continued until no gas could be detected.
2.2.2. Relationship between various pressure reduction differentials and the digestion capabilities of excess sludge after thermal hydrolysis
The pressure differentials (0.7–0, 0.7–0.1, 0.6–0.1, 0.5–0.1, 0.4–0.1 Mpa) were adjusted to carry out experiments of thermal hydrolysis with an excess sludge feed concentration of 11 wt-%, thermal hydrolyzing temperature of 170 C, reaction time of 30 min (a–b MPa: a represents the pressure differential between the thermal hydrolysis reactor and the first-stage pressure reduction tank while b is the pressure differential between the first-stage pressure reduction tank and the second-stage pressure reduction tank).
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