Biological aerated filter

Abstract

The invention discloses a biological aerated filter. The biological aerated filter is divided into a water distribution zone and a water inlet zone, wherein the water distribution zone and the water inlet zone are arranged at intervals by virtue of a partition plate; the bottom of the water distribution zone is provided with an aeration pipe, and the aeration pipe releases oxygen to the water distribution zone; the partition plate is provided with a filter head which causes the water distribution zone and the water inlet zone to be communicated; the water inlet zone is also connected with a backwash water inlet pipe and a backwash air inlet pipe, and the backwash water inlet pipe and the backwash air inlet pipe are respectively used for water injection and air injection on the water inlet zone by virtue of valves; and a branch pipeline is arranged between the backwash water inlet pipe and the valves of the backwash water inlet pipe, and the branch pipeline is also provided with a sludge discharge pump. By applying the technical scheme of the invention, complete biological treatment can be completely achieved in one biological aerated filter while no secondary sedimentation tank used for sludge sedimentation is required to be arranged downstream; meanwhile, valves of the backwash water inlet pipe and the valves of the backwash air inlet pipe are closed, the sludge discharge pump is started, sludge gathered at the water distribution zone is reversely and forcibly discharged, then backwashing is carried out, time of the backwashing is shortened, and water yield is increased.

Description

technical field [0001] The invention relates to an aerated biological filter. Background technique [0002] Biological aerated filter, referred to as BAF, is a new type of biofilm sewage treatment process developed in Europe and the United States in the late 1980s. This process has the functions of removing SS, COD, BOD, nitrification, nitrogen, phosphorus, and AOX ) role. The biological aerated filter integrates biological oxidation and interception of suspended solids, saves the subsequent sedimentation tank (secondary sedimentation tank), has a volume load, a large hydraulic load, a short hydraulic retention time, requires less infrastructure investment, and the effluent water quality is good: the operation can Low power consumption and low operating cost. However, when the biological aerated filter in the prior art is in operation, the flow velocity of the influent water in the water distribution area decreases sharply, causing a large amount of sludge in the water dis...

AI Technical Summary

Problems solved by technology

However, when the biological aerated filter in the prior art is in operation, the flow rate of the influent water in the water distribution area decreases sharply, causing a large amount of sludge in the water distribution area. When the biological aerated filter is backwashed, the sludge is washed and floated by the backwash water , causing the backwash time to be too long

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