Method for promoting anaerobic sludge fermentation to produce short-chain fatty acids by utilizing reduced iron powder
A technology for sludge anaerobic fermentation and short-chain fatty acids, which is applied in the field of environmental protection and resource utilization to achieve the effects of volume reduction, high utilization value, and promotion of acid production rate and output
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[0031] Example 1
[0032] (1) In a plexiglass reactor with a working volume of 5.0L, the supernatant liquid produced by the traditional activated sludge method is added after natural static settling for 24 hours, and the remaining sludge (pH=6.8) obtained is used as anaerobic fermentation production Substrate of short-chain fatty acid (ie sludge sample, the same in the following examples);
[0033] (2) Add reduced iron powder with a particle size of 0.15mm to the reactor, the ratio of the amount to the dry weight of the sludge is 0.3:1, the reactor is filled with nitrogen and oxygen is driven for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The temperature of the fermentation reaction is controlled to 20±1℃, the pH of the fermentation system is changed within the range of 6.5-8.0, the residence time of...
Example Embodiment
[0034] Example 2
[0035] (1) In a plexiglass reactor with a working volume of 5.0L, the supernatant liquid produced by the traditional activated sludge method is added and the supernatant liquid is discharged after natural static settling for 24 hours, and the remaining sludge (pH=6.8) obtained is used as a short-term anaerobic fermentation production. Substrate of chain fatty acids;
[0036] (2) Add reduced iron powder with a particle size of 0.15mm into the reactor, the ratio of the amount to the dry weight of the sludge is 1.2:1, the reactor is filled with nitrogen and oxygen is driven for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The reaction temperature is 20±1℃, the pH of the fermentation system changes in the range of 6.5-8.0, the residence time of sludge in the reactor is 5 days, and the co...
Example Embodiment
[0037] Example 3
[0038] (1) In a plexiglass reactor with a working volume of 5.0L, add the supernatant liquid produced by the traditional activated sludge method and drain off the supernatant liquid after natural settling for 24 hours, and the remaining sludge (pH=6.8) obtained is used as anaerobic fermentation production Substrate of short-chain fatty acids;
[0039] (2) Add reduced iron powder with a particle size of 10μm to the reactor, the ratio of its dosage to the dry weight of sludge is 0.3:1, the reactor is filled with nitrogen and oxygen is driven for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The reaction temperature is 20±1℃, the pH of the fermentation system changes within the range of 6.5-8.0, the residence time of sludge in the reactor is 5 days, and the content of short-chain fatty a...
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