Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment
A technology for excess sludge and methane production, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane production efficiency of excess sludge, achieve sludge reduction, resource pollution of the environment, and increase acid production speed effect
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Embodiment 1
[0021] Add 10 liters of excess sludge to 10 identical 2-liter reactors on average (the reactor is made of plexiglass, with an inner diameter of 100 mm, a height of 260 mm, and a cylindrical shape). It is 15-60min, the initial pH value is adjusted to 8-12, the residence time of sludge in the reactor is 1-12 days, and the temperature is 30-40℃. The optimum conditions for thermal hydrolysis of the sludge were found to be 98-102°C, and the time was 28-32min. The optimum conditions for the acid production stage were the initial pH value of 10.5-11.5, and the residence time in the reactor for 5-7 days. At a temperature of 33-37°C, the obtained short-chain fatty acids were 4361.4 mg per liter (calculated as chemical oxygen demand).
Embodiment 2
[0023] Add 1 liter of excess sludge to a 2-liter reactor, the thermal pretreatment temperature is 98-102 ° C, the time is 28-32 min, the initial pH value of microbial action is 10.5-11.5, and the anaerobic fermentation is 5-7 days. , adjust the pH of the mixture to neutral, add 8% anaerobic granular sludge by volume, control the temperature to be 28-32°C, ferment for 5-7 days, and the methane yield is 0.8 liters.
Embodiment 3
[0025] Add 1 liter of excess sludge to a 2-liter reactor, the thermal pretreatment temperature is 98-102 ° C, the time is 28-32 min, the initial pH value of microbial action is 10.5-11.5, and the anaerobic fermentation is 5-7 days. , adjust the pH of the mixture to neutral, add 10% anaerobic granular sludge by volume, control the temperature to 28-32°C, ferment for 5-7 days, and the methane yield is 1.2 liters.
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