Artificial wetland sewage treatment system adopting rotational flow active sludge method pretreatment

Abstract

The invention relates to an artificial wetland sewage treatment system adopting rotational flow active sludge method pretreatment, which comprises a primary sedimentation tank, a venturi, a rotational flow active sludge pool, a secondary sedimentation tank and an artificial wetland, wherein a 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 rotational flow active sludge pool, and the shape of the cross section of the rotational flow active sludge pool is round; the yielding water of the rotational flow active sludge pool is connected into the secondary sedimentation tank, and the yielding water of the secondary sedimentation tank is connected into the artificial wetland; and the artificial wetland adopts a horizontal baffling structure, and the water outlet is provided with a water storage tank. The artificial wetland sewage treatment system 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 a comprehensive sewage treatment system based on a swirling 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 ...

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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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