Integrated recycling-type biological sewage treatment device and correlation method thereof

Abstract

The invention discloses an integrated recycling-type biological sewage treatment device. The device comprises a water intake channel, a mud-water mixing zone, an anoxic zone, an aerobic zone, a precipitation water inlet zone and a sedimentation zone orderly connected in an upstream-downstream relationship. The anoxic zone is connected to the aerobic zone through a gas stripping circulating pipe. The device also comprises a sludge return device. The sludge return device comprises a sludge return main canal connected to the upstream part of the mud-water mixing zone and a first gas stripping sludge return pipe. The sedimentation zone is connected to the sludge return main canal through the first gas stripping sludge return pipe or the sedimentation zone is orderly connected to the sludge return main canal through the first gas stripping sludge return pipe and a sludge return branch pipe or branch canal. The sedimentation zone is connected to a water outlet discharge device. The treatment device is particularly suitable for towns, residential areas and living areas in scenic spots and has the characteristics of relatively small investment, strong pertinency, mature technology, simple structure, stable performances, long service life, small floor area, low operation cost, safe and reliable operation and maintenance and management convenience.

Description

technical field [0001] The invention relates to the technical field of sewage treatment. Background technique [0002] According to the actual operation of small sewage treatment facilities or devices in towns and concentrated residential areas at home and abroad, conventional sewage treatment processes are generally used such as: contact oxidation (including AO or A2 / O type), small oxidation ditch and CASS (SBR series), etc., the processing process is long, and the operation management requires corresponding professional and technical personnel, especially for remote villages and towns, there will be no corresponding technical management personnel to provide technical support. When the sewage treatment process needs to increase the standard, the effluent of the conventional treatment process requires ammonia nitrogen ≤ 5 (8) mg / L; total nitrogen ≤ 15 mg / L, and the energy consumption of the reflux of the nitrification liquid in the conventional process is high, requiring low...

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Problems solved by technology

[0002] According to the actual operation of small sewage treatment facilities or devices in towns and concentrated residential areas at home and abroad, conventional sewage treatment processes are generally used such as: contact oxidation (including AO or A2 / O type), small oxidation ditch and CASS (SBR series), etc., the processing process is long, and the operation management requires corresponding professional and technical personnel, especially for remote villages and towns, there will be no corresponding technical management personnel to provide technical support

When the sewage treatment process needs to increase the standard, the effluent of the conventional treatment process requires ammonia nitrogen ≤ 5 (8) mg / L; total nitrogen ≤ 15 mg / L, and the energy consumption of the reflux of the nitrification liquid in the conventional process is high, requiring lower concentrations of ammonia nitrogen and total nitrogen. It will greatly increase the operating cost of sewage treatment

[0003] Conventional treatment equipment such as: MBR membrane equipment, integrated buried equipment, biological turntable or biological runner, etc., have high operating costs, high daily maintenance costs, certain hidden safety hazards in operation management, and the effluent cannot meet the standards stably. At the same time, there are problems such as the return of nitrification liquid or sludge, which all use pumps to return, and the sewage treatment system is more complicated.

If the conventional oxidation pond treatment technology, artificial rapid infiltration technology, anaerobic + constructed wetland sewage treatment process or unpowered domestic sewage purification device and other processes are adopted, although the operating cost is low, there will be impacts on the surrounding environment during the operation process (mainly Odor, mosquitoes and flies), unstable operation, clogged filter layer, seasonal instability in wetlands, effluent water quality cannot meet the standard stably, and has the disadvantage of large footprint

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