Method for improving production of methane from surplus sludge of wastewater treatment plant
A technology for excess sludge and methane production, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane efficiency, reduce pollution, increase the amount of fatty acids and methane production, and fully recover and reuse.
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Embodiment 1
[0024] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 7:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, and the concentration of short-chain fatty acids is 50g-COD / kg-TS after fermentation for 11-13 days.
[0025] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 1.6L-CH 4 .
Embodiment 2
[0027] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 10:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, the fermentation is 11-13 days, and the concentration of short-chain fatty acids is 100g-COD / kg-TS.
[0028] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 1.8L-CH 4 .
Embodiment 3
[0030] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 12:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, the fermentation is 11-13 days, and the concentration of short-chain fatty acids is 150g-COD / kg-TS.
[0031] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 2.5L-CH 4 .
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