Method of producing biogas by recycling orange peel residue and dehydrated sludge through fermentation
A technology of citrus peel residue and dewatered sludge, applied in fermentation, biological sludge treatment, gas fuel and other directions, can solve the problems of low microbial concentration, long fermentation process, low nitrogen and phosphorus content, etc., to increase microbial biomass and improve fertilizer efficiency. , the effect of low operating costs
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Embodiment 1
[0024] Mix 1.000kg of fresh citrus peel (moisture content 81.5%) crushed to less than 5mm with 0.902kg dewatered sludge (water content 79.5%, volatile solid mass fraction 70.5%), and then add 0.925kg inoculum (water content 92% yield) and 4.19L water were fully mixed, and anaerobic fermentation was performed for 20 days at an average temperature of 30°C. During the fermentation process, quicklime supernatant was used to adjust and maintain the pH of the fermentation broth at 6.5. Among them: moisture content refers to the mass fraction of water. Volatile solids mass fraction refers to the mass fraction of volatile solids in dry matter. The results are shown in Table 1.
[0025] Table 1
[0026] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 15932.6 796.6 48.2 59.1
Embodiment 2
[0028] Mix 0.960kg of fresh citrus peel (moisture content 81.5%) crushed to less than 5mm with 0.298kg dewatered sludge (water content 70.0%, volatile solid mass fraction 80.0%), and then add 0.545kg inoculum (water content 90% yield) and 4.19L water were fully mixed, and anaerobic fermentation was performed for 26 days at an average temperature of 25°C. During the fermentation process, the quicklime supernatant was used to adjust and maintain the pH of the fermentation broth between 7.0. The results are shown in Table 2.
[0029] Table 2
[0030] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 15548.5 598.0 44.1 56.8
Embodiment 3
[0032] 1.960kg of fresh citrus peels (water content 81.5%) crushed to less than 5mm were fully mixed with 0.690kg dewatered sludge (water content 65.0%, volatile solid mass fraction 50.5%), and then 1.975kg inoculum (water content rate of 94%) and 4.19L of water were fully mixed, and anaerobic fermentation was performed for 24 days at an average temperature of 20°C. During the fermentation process, quicklime supernatant was used to adjust and maintain the pH of the fermentation broth at 7.5. The results are shown in Table 3.
[0033] table 3
[0034] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 18946.5 789.4 50.2 58.5
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