Round integrated oxidation ditch

Abstract

The invention discloses a round integrated oxidation ditch. The oxidation ditch is a continuous and enclosed concentric circle like reactor, two rings outside sequentially form an external ditch (10) and an intermediate ditch (8), the liquid surfaces of the external ditch (10) and the intermediate ditch (8) are provided with a stream pushing aeration machine (1), an intermediate ring forms a secondary sedimentation tank (9), the secondary sedimentation tank (9) is internally provided with a mud scraper (4), the circumference wall of the secondary sedimentation tank (9) is provided with a water inflow skirtboard (3), the inner wall of the intermediate ditch (8) is provided with a water distributing hole (5), a mud collecting well (7) is arranged outside the round ring, and the mud collecting well (7) is internally provided with a sludge pump (6). The water distributing hole (5) interval on the inner wall of the intermediate ditch (8) is 300-600mm. The diameter Phi of water distributing hole (5) is 20-30mm. An annular effluent weir is arranged between the inner wall of the intermediate ditch (8) and the secondary sedimentation tank (9). The invention has high aeration oxygenating efficiency, stable running and convenient operation and maintenance, occupying area is small, and flow is simplified and smooth.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to an oxidation ditch for biological treatment of sewage. Background technique [0002] Discharge of domestic sewage and industrial wastewater containing organic pollutants into natural water bodies will cause water quality to deteriorate, turn black and smelly, and lose its use and ornamental functions due to the large consumption of dissolved oxygen in the water body. For wastewater containing organic pollutants, biotechnology is mainly used to treat organic matter and nutrient salts in sewage by using the metabolism of microorganisms into stable and harmless substances, such as CO 2 、H 2 O, N 2 Wait. Oxidation ditch activated sludge method, also known as circulating mixed activated sludge method, is to oxidize, absorb or decompose organic matter through the activated sludge that accumulates a large number of microorganisms in the annular ditch. On the one hand, the dissolved oxygen...

AI Technical Summary

Problems solved by technology

The combined oxidation ditch integrates the two functions of aeration and sedimentation, which can eliminate the sludge return system, reduce the floor area, and the operation is relatively simple, but the technology is not yet mature. They affect each other together, and the rectifying plate in the sedimentation area is easily blocked by a large amount of sludge. After anaerobic digestion, gas is produced and floats up. After the large piece of floating sludge is broken, its settlement performance is extremely poor, and it enters the collection pipe with the water flow, seriously affecting the water quality of the effluent.

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