Complete self-backflow well type anabroeic-anoxic-oxic (AAO) sewage treatment method

Abstract

The invention discloses a complete self-backflow well type anabroeic-anoxic-oxic (AAO) sewage treatment method. A sewage treatment device is provided, wherein the sewage treatment device comprises a well body and a secondary sedimentation tank; the well body comprises a well cylinder and a reciprocal aeration system; the outer wall of the well cylinder is an impervious wall; the interior of the well cylinder is divided into two sides by using an isolation plate; one side is an anaerobic zone; a water intake tube is arranged at the top part of the anaerobic zone; the bottom part of the well cylinder is a middle sedimentation zone with a gravity sludge discharge tube; the reciprocal aeration system is arranged on the other side of the well cylinder; the reciprocal aeration system comprises an upward aeration head, a downward aeration head and an aeration device; the reciprocal aeration system is divided into an anoxic zone and an oxic zone taking the upward aeration head as the boundary; the secondary sedimentation tank, a sludge backrflow hole and a water outlet are arranged at the periphery of the upper part of the well cylinder; an overflow dam and a water collection tank are arranged at the periphery of the secondary sedimentation tank; a water outtake tube is arranged at the bottom of the water collection tank; a sludge discharge tube is arranged at the bottom of the secondary sedimentation tank; sewage raw water is supplied through the water intake tube, sequentially passes through the anaerobic zone, the anoxic zone and the oxic zone, and further enters the secondary sedimentation tank. Through a series of physical and chemical action, the sewage is treated. The method disclosed by the invention has the advantages of efficiency, environment friendliness, energy conservation and low cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a completely self-reflux well type AAO (the abbreviation of the first letter of English Anaerobic-Anoxic-Oxic, that is, anaerobic-anoxic-aerobic) sewage treatment method. Background technique [0002] At present, the construction and operation cost of sewage treatment facilities is high, and energy saving and consumption reduction will become a problem that the industry needs to solve. [0003] The integrated new energy-saving water treatment method has attracted wide attention in the industry and has been effectively applied in actual production. The construction and operation of the well-type AAO process is convenient, energy-saving, environmentally friendly, no peculiar smell, and strong water resistance. It is widely used in urban living areas and large-scale industries. Districts and factories subject to land occupation restrictions show higher advantages. [0004]...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the poor stability of the current integrated process, the limitation of practical application, and the inability to simultaneously remove nitrogen and phosphorus and treat polymer organic wastewater, and provide a completely self-reflux well type AAO sewage treatment method. Achieve energy-saving synchronous nitrification and denitrification denitrification and phosphorus removal, the effect of treating polymer organic wastewater and other wastewater of different nature

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