Activated sand filter equipment

　The activated sand filter equipment can be directly used for the filtration of surface water and groundwater in tap water, replacing the fast filter tank; In conventional secondary biochemical treatment, activated sand filtration can be directly connected to the effluent of the secondary sedimentation tank for deep water treatment. Conventional secondary biochemical treatment can further treat the effluent of the secondary sedimentation tank without the need for special process facilities such as coagulation tanks and clarification tanks. Coagulation agents can be directly added to the inlet pipeline or channel. The cyclic movement of filter material inside the filter can play a stirring role. Compared with conventional three-stage filtration, the active sand filter process significantly reduces the amount of work and investment, and has low operation and maintenance costs.