The invention discloses a
biogas slurry multistage-
fermentation and multistage-filtering purification
system, which comprises a multistage-
fermentation system and a multistage-filtering purification
system, wherein the multistage-
fermentation system is communicated with the multistage-filtering purification system; the multistage-
fermentation system comprises at least three fermentation
pool units; the three fermentation
pool units are sequentially communicated through a flow guide
pipe; the multistage-filtering purification system comprises at least three filtering
pool units; the three filtering pool units are sequentially communicated through a filtering
pipe; the first fermentation pool unit is connected with a feeding opening; the third filtering pool unit is connected with a
water discharge pipe. The
biogas slurry multistage-fermentation and multistage-filtering purification system has the advantages that large-batch factory production is convenient; great convenience is brought for transportation and installation; in addition, the whole system is buried under the ground; plants can be planted in gaps above and beside pools; a large number of
land resources are saved; independent maintenance can be realized; during maintenance, the operation of other units of the system cannot be influenced; the production of
biogas low-carbon biological energy sources is greatly improved; the
water pollution is effectively treated.