Method for reinforcing surplus sludge anaerobic digestion methane production through alkaloids
A technology of excess sludge and anaerobic digestion, applied in the field of environmental engineering, can solve the problems of low methane production efficiency, low degree, slow hydrolysis and acidification rate, etc., and achieve the effect of increasing methane production, promoting acidification degree, and easy degradation
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Embodiment 1
[0027] Concentrate the remaining sludge from the sewage plant and adjust the solid content to 3%. Inoculate the inoculum sludge with a solid content of 5% from the anaerobic digestion tank into the remaining sludge at a volume percentage of 10%, mix evenly, and inoculate the alkaloids according to The concentration of 0.3mg / L is added to the fermentation mixture. The alkaloids include matrine, choline, and betaine in a ratio of 1:1:1. After mixing evenly, adjust the pH to 6.8 and introduce it into the anaerobic digestion tank. The anaerobic digestion temperature was set at 30°C, and after 28 days of reaction, the cumulative methane production was 2200ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 27%, and the final cumulative methane production increased by 43%.
Embodiment 2
[0029] Concentrate the excess sludge from the sewage plant and adjust the solid content to 4%, inoculate the inoculum sludge with a solid content of 3% from the anaerobic digestion tank into the excess sludge at a volume percentage of 50%, mix evenly, and inoculate the alkaloids according to The concentration of 0.6mg / L is added to the fermentation mixture. The alkaloid added is choline. After mixing evenly, adjust the pH to 7.2 and then introduce it into the anaerobic digestion tank. The anaerobic digestion temperature is set at 35°C. After 20 days of reaction, Cumulative methane production is 2500ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 30%, and the final cumulative methane production increased by 50%.
Embodiment 3
[0031] Concentrate the excess sludge from the sewage plant and adjust the solid content to 5%, inoculate the inoculum sludge with a solid content of 4% from the anaerobic digestion tank into the excess sludge at a volume percentage of 30%, mix evenly, and inoculate the alkaloids according to Add the concentration of 1.0mg / L to the fermentation mixture. The alkaloid added is matrine. After mixing evenly, adjust the pH to 7.0 and then introduce it into the anaerobic digestion tank. The anaerobic digestion temperature is set at 33°C. After 25 days of reaction , the cumulative methane production is 2350ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 25%, and the final cumulative methane production increased by 45%.
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