Sewage treatment device based on PN/A coupled biochar SPD process

The invention discloses a sewage treatment device based on a PN/A coupled charcoal SPD process. The sewage treatment device comprises a PN/A reactor, and a front-end SPD fixed bed and a rear-end SPD fixed bed which are respectively positioned on the left side and the right side of the PN/A reactor, the front-end SPD fixed bed is connected with the PN/A reactor through a front-end up-flow/down-flow groove, and the rear-end SPD fixed bed is connected with the PN/A reactor through a rear-end up-flow/down-flow groove; the internal structure of the front-end SPD fixed bed and the internal structure of the rear-end SPD fixed bed are in bilateral symmetry, and filler areas in the front-end SPD fixed bed and the rear-end SPD fixed bed are each composed of a plurality of charcoal bricks. The sewage treatment device effectively solves the problems that in the prior art, the cost of a deep denitrification carbon source is high, the residual sludge amount is increased and the like, ensures the stability and biological ac