Method for producing methane by sludge
A sludge and methane technology, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane efficiency, reduce pollution, fully recover and reuse, and increase production.
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Embodiment 1
[0024] Add 32L of sludge to 8 identical 6L reactors on average (the reactors are made of plexiglass, with an inner diameter of 150mm, a height of 350mm, and a cylindrical shape), and the pH is controlled at 4, 5, 6, 7, 8, and 9 respectively. , 10, after 4, 6, 8, 10, 12 days of hydrolysis acid production process, temperature 21 ℃, stirring speed 80r / min. The optimum condition for hydrolysis and acid production was found to be pH=10, and after 8 days, the maximum concentration of short-chain fatty acids was 2957mg / L.
Embodiment 2
[0026] 16L of sludge was added to four identical 6L reactors on average, and the pH was controlled at 10. After 8 days of hydrolysis and acid production, the temperature was 21 ° C, and the stirring speed was controlled at 40, 60, 80, and 100 r / min. The optimum condition of acid hydrolysis was measured when the stirring speed was 80r / min, and the maximum concentration of short-chain fatty acids was 2957mg / L.
Embodiment 3
[0028] Add 4L of sludge into a 6L reactor, stir for 8 days under the conditions of pH 6 and temperature 21°C, and the measured concentration of short-chain fatty acids is 522.3mg / L. Then the temperature of the reactor was controlled at 35° C., and the pH of the mixture was adjusted to 7, and then 0.5 L (12.5%) anaerobic granular sludge was inoculated. After stirring for 8 days, the amount of methane measured was 7.1 L.
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