A method for producing biogas with molasses as substrate
A molasses and substrate technology, applied in biosynthesis, waste fuel, fermentation, etc., to achieve good efficiency and effect, accelerated development, and controllable production scale
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Embodiment 1
[0027] Obtain cane molasses from a sugar factory; adjust the pH of the molasses to 10.0 with lime, filter, and obtain the molasses filtrate after neutralization.
[0028] The obtained molasses filtrate was diluted with water to an initial COD of 2000 mg / L, potassium dihydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 200:1, and yeast powder was added to adjust the diluted molasses C / N mass ratio to 10:1.
[0029] The anaerobic granular sludge is loaded into the anaerobic fermentation tank, and the amount of sludge is 50% of the volume of the reactor.
[0030] Pump the molasses dilution containing phosphorus source into the anaerobic fermentation tank for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 6 hours, the fermentation temperature is 35°C, and the biogas (biogas) flows from the top of the fermentation reactor. discharge. The biogas production efficiency is 30%.
Embodiment 2
[0032] Obtain beet molasses from a sugar factory; adjust the pH of the molasses to 5.5 with calcium carbonate, filter, and obtain a molasses filtrate after neutralization.
[0033] The obtained molasses filtrate was diluted with water to an initial COD of 12000 mg / L, ammonium dihydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 100:1, and urea was added to adjust the diluted molasses C / N mass ratio to 80:1.
[0034] The anaerobic granular sludge is loaded into the upflow anaerobic sludge bed reactor, and the amount of sludge loaded is 10% of the volume of the reactor.
[0035] Pump the molasses dilution into the upflow anaerobic sludge bed reactor for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 2 hours, the fermentation temperature is 15°C, and the biogas (biogas) is discharged from the fermentation reactor. Drain the top. The biogas production efficiency is 35%.
Embodiment 3
[0037] Obtain cane molasses from a sugar factory; adjust the pH of the molasses to 7.5 with sodium carbonate, filter, and obtain the molasses filtrate after neutralization.
[0038] The obtained molasses filtrate was diluted with water to an initial COD of 25000 mg / L, sodium hydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 300:1, and ammonium carbonate was added to adjust the diluted molasses C / N mass ratio to 60:1.
[0039] The anaerobic activated sludge is loaded into the anaerobic granular sludge expanded bed reactor, and the amount of sludge loaded is 80% of the volume of the reactor.
[0040] Pump the molasses dilution into the anaerobic granular sludge expanded bed reactor for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 15 hours, the fermentation temperature is 50°C, and the biogas (biogas) is discharged from the fermentation reactor. Drain the top. The biogas production efficiency is 40%.
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