High-efficiency pre-aeration rotational flow type active sludge aerobic biochemical sewage treatment unit

Abstract

The invention relates to a high-efficiency pre-aeration rotational flow type active sludge aerobic biochemical sewage treatment unit, which comprises a bar screen, a primary sedimentation tank, a venturi, an active sludge pool and a secondary sedimentation tank connected in turn, wherein the bar screen is positioned in the front of the primary sedimentation tank; the inlet of the gradually reducing part of the venturi is connected with the upper part of the primary sedimentation tank through a high-pressure pump, the throat part is connected with the atmosphere through an air inlet pipe, and the outlet of the gradually expanding part is provided with a jet pipe extending forwards; the jet pipe is tangentially connected with the lower part of the active sludge pool; the shape of the cross section of the active sludge pool is round; and the secondary sedimentation tank is positioned behind the active sludge pool and is connected with the water outlet of the active sludge pool. The lower part of the primary sedimentation tank is inverted frustum shaped; the bar screen is a mechanical bar screen or a fixed bar screen; the sludge discharging ports of the primary sedimentation tank and the secondary sedimentation tank are connected with a respective sludge pump respectively; and each sludge pump is connected with the sludge pool. The high-efficiency pre-aeration rotational flow type active sludge aerobic biochemical sewage treatment unit has the advantages of simple structure, convenient operation, good adaptability, high oxygen content in the sewage and good purification effect, and is mainly adapted to the treatment of domestic sewage.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to an integrated sewage treatment system based on an activated sludge tank combined with various treatment methods, belonging to the field of environmental protection. Background technique [0002] Since 1804, the British first used sedimentation and filtration technology as a centralized water treatment plant. In 1884, the Americans invented the coagulation, sedimentation, filtration, and chlorine disinfection technology, which has been used for 120 years. There are new discoveries and improvements in treatment, but the treatment process of domestic water basically remains the same, essentially no update and breakthrough. However, the water source to be treated has undergone great changes: the water source a hundred years ago was not polluted due to the underdevelopment of industry and agriculture. Over the past few decades, the development of modern industry, especially the sudden and...

AI Technical Summary

Problems solved by technology

These two aerobic methods have their own advantages and disadvantages, and both have a long history of development. Generally speaking, the former has a better effect on the removal of organic pollutants and requires lower capital investment, but the operation is more complicated and more It is used in the occasion of large water volume: the latter is more suitable for the impact load caused by the change of water quality and water volume, and the operation is relatively simple, so it is more used in the treatment of small water volume or slightly polluted water

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