Method for mixed fermentation of sludge disintegrated by low-strength ultrasonic wave and crop straws pretreated by fermentation broth and application of method
A technology of crop straw and mixed fermentation, which is applied in the direction of biological sludge treatment, fermentation, waste fuel, etc., can solve the problems of increased construction and operation costs, long hydraulic retention time, and large volume of sludge digestion structures, so as to shorten the anaerobic Effects of digestion time, increased disposal levels, and improved mesophilic anaerobic digestion performance
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Embodiment 1
[0019] Weigh the corn stalk powder, pass it through a 20-mesh sieve, and fully mix the corn stalk powder and fermentation liquid according to the solid-liquid ratio of 1:10 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treated in the straw pretreatment pool for 8h. TCOD in the liquid phase increased by 3000mg / L after pretreatment
[0020] The sludge with a solid content of 2wt% is transported by a sludge pump to a multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 20kHz, the diameter of the probe is 20mm, and the acoustic energy density is 0.5kW / m 3 , the cracking time is 3 minutes. After cracking, the TCOD in the sludge liquid phase increased by 2000mg / L.
[0021] After pretreatment, the wet corn stalks and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.4), and the mixture is fed into the hydrolysis acidification, the hydraulic retention time is 24h, and the ...
Embodiment 2
[0023] Weigh the wheat straw powder, pass it through a 30-mesh sieve, and fully mix the wheat straw powder and fermentation liquid according to the solid-liquid ratio of 1:15 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treat in the straw pretreatment pool for 36h. After pretreatment, TCOD in the liquid phase increased by 10000mg / L
[0024] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 28kHz, the diameter of the probe is 25mm, and the sound energy density is 0.8kW / m 3 , the solid content of the sludge is 2.5%, and the cracking time is 10 minutes. After cracking, the TCOD in the sludge liquid phase increased by 5000mg / L.
[0025] After the pretreatment, the wet wheat straw and the sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.8), and the mixture is fed into hydrolytic acidification, the hydraulic retent...
Embodiment 3
[0027] The rice straw powder is weighed, passed through a 30-mesh sieve, and the rice straw powder and fermentation liquid are fully mixed according to a solid-to-liquid ratio of 1:20 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treat in the straw pretreatment pool for 15h. TCOD in the liquid phase increased by 5483mg / L after pretreatment
[0028] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor for cracking. The frequency of the ultrasonic reactor is 40kHz, the diameter of the probe is 30mm, and the sound energy density is 0.78kW / m 3 , the solid content of the sludge is 4%, and the cracking time is 8 minutes. After cracking, the TCOD in the sludge liquid phase increased by 3780mg / L.
[0029] After pretreatment, the wet rice straw and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:2.1), and the mixture is fed into the hydrolysis acidification, the hydraulic retention ...
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