The invention belongs to the technical field of
sewage treatment, and particularly relates to an ecological overflow weir for purifying
water quality, which comprises dam piers, an upstream water retaining weir and a downstream purifying device, when the ecological overflow weir is used, the
water level is increased before the
water flow reaches the water retaining weir, the fall of the
water flow is increased, and the contact between the
water flow and air is increased, so that the
aeration in the
water body is improved;
water diversion teeth are uniformly arranged at the top of the water retaining weir, so that water flow uniformly and crossly flows into the
aeration tank along the
water diversion teeth, the contact between water and air is further expanded,
suspended solids in the water can be prevented from sinking, and the contact between organic matters in the water and microorganisms and dissolved
oxygen is enhanced, thereby ensuring that the microorganisms in the water have sufficient dissolved
oxygen. Organic matters in the
sewage are oxidized and decomposed, so that
water pollution is effectively improved and treated; the multiple permeable abutments are arranged at intervals in the transverse direction, the adjacent permeable abutments are connected together through the steel wire net frames to form the combined permeable dam body, the permeable dam body is filled with the
sludge carrier, and the
sludge carrier can effectively adsorb
sludge and can purify water flow, so that the purposes of effectively treating
sewage and purifying water are achieved.