The invention discloses a method and a
system for producing an anaerobic
biogas slurry concentrated
fertilizer.
Sewage is filtered by a grillage
machine, then is collected into a water collecting tank, and is pumped into a
solid-liquid separator, the quality and quantity of treated
sewage are balanced and adjusted in an adjusting tank, then the
sewage enters a CSTR device and is subjected to anaerobic
fermentation, generated
biogas is recycled, generated
biogas slurry is discharged into a
sediment pool and precipitates, the settled biogas
slurry is pumped back to the CSTR device through a
sludge reflux pump for circular treatment, and
sludge accumulated in the
sediment pool and an MBR device is periodically discharged into a
sludge biogas residue
pool and is subjected to squeezing composting; a biogas slurry penetrating fluid separated by the MBR device is concentrated by a DTRO membrane device, and a clear fluid separated from the anaerobic biogas slurry by the DTRO membrane device iscollected into a second
water production tank and is discharged after reaching the standard through detection; and trace elements, other nutritional ingredients and functional ingredients are added into the separated concentrated solution to prepare the liquid
fertilizer, and the liquid
fertilizer is sub-packaged. The problems of high biogas slurry yield, high treatment cost, difficult storage and transportation, low
nutrient content and the like in the traditional anaerobic
engineering are solved, and the anaerobic biogas slurry is better recycled.