Method for producing volatile fatty acids and improving dehydration performance by tempering and strengthening anaerobic fermentation of kitchen waste by egg shells and application of method
A volatile fatty acid, anaerobic fermentation technology, applied in the field of environmental protection and resource utilization, can solve the problems of low yield of volatile fatty acids, etc., and achieve the effects of improving dehydration performance, improving efficiency, and making up for the lack of organic carbon sources.
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Embodiment 1
[0028] (1) In a serum bottle with a working volume of 600mL, add a certain amount of food waste slurry with a solid content of 10% as a fermentation substrate (150mL), and add 10% (according to organic matter content) secondary sedimentation tank sludge to mix As inoculated sludge (sludge 200mL, concentration 20g dry weight / L);
[0029] (2) The dosage of the eggshell powder that is added into the reactor is 0.01g / g TSS (kitchen waste and sludge dry weight), and the reactor is filled with nitrogen and deoxygenated for 10min, and the reactor is sealed and mechanically stirred ( 180rpm) react after mixing the fermentation substrate evenly. The fermentation reaction temperature was controlled at 35°C, the fermentation days were controlled at 4 days, the maximum content of VFAs was 5345.5mgCOD / L, and the capillary water absorption time (CST, one of the important indicators for evaluating dehydration performance) of fermentation residue was 820.4s.
Embodiment 2
[0031] (1) In a serum bottle with a working volume of 600mL, add a certain amount of food waste slurry with a solid content of 10% as a fermentation substrate (150mL), and add 10% (according to organic matter content) secondary sedimentation tank sludge to mix As inoculated sludge (sludge 200mL, concentration 20g dry weight / L);
[0032] (2) The dose of egg shell powder was added to the reactor at 0.02g / g TSS, the reactor was filled with nitrogen and oxygen was driven out for 10 minutes, the reactor was sealed, and the fermentation substrate was mixed evenly by mechanical stirring (180rpm) before the reaction was carried out. The fermentation reaction temperature was controlled at 35°C, the fermentation days were controlled at 6 days, the maximum content of VFAs was 13860.0mg COD / L, and the capillary water absorption time of fermentation residue was 670.4s.
Embodiment 3
[0034] (1) In a serum bottle with a working volume of 600mL, add a certain amount of food waste slurry with a solid content of 10% as a fermentation substrate (150mL), and add 10% (according to organic matter content) secondary sedimentation tank sludge to mix As inoculated sludge (sludge 200mL, concentration 20g dry weight / L);
[0035] (2) The dose of egg shell powder was added to the reactor at 0.1 g / g TSS, the reactor was filled with nitrogen and oxygen was driven out for 10 minutes, the reactor was sealed, and the fermentation substrate was mixed evenly by mechanical stirring (180 rpm) before the reaction was carried out. The fermentation reaction temperature was controlled at 35°C, the fermentation days were controlled at 7 days, the maximum content of VFAs was 26890.5mg COD / L, and the capillary water absorption time of fermentation residue was 189.5s.
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