Oxidation ditch nitrogen and phosphorus removal sewage treatment system and technology thereof

A technology for sewage treatment system and denitrification and dephosphorization, which is applied in the field of denitrification and dephosphorization sewage treatment system, can solve the problems of difficulty in maintaining high concentration of microorganisms in oxidation ditch, limited sewage treatment capacity, waste of facilities and equipment, etc. Processing capacity, ensure the air flotation effect, the effect of short hydraulic retention time

Inactive Publication Date: 2014-01-15
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the existing oxidation ditch sewage treatment system, its sewage treatment capacity per unit area is limited, resulting in waste of facilities and equipment; the oxidation ditch sewage treatment process uses gravity sedimentation, which has low solid-liquid separation efficiency and poor sludge concentration effect, making the oxidation ditch It is difficult for microorganisms to maintain a high concentration, which leads to the problem of low treatment capacity. The purpose of the present invention is to provide an oxidation ditch nitrogen and phosphorus removal sewage treatment system and its process, which has high sewage treatment capacity and good solid-liquid separation effect. Applicable to new projects of oxidation ditch sewage treatment plants, especially renovation projects

Method used

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  • Oxidation ditch nitrogen and phosphorus removal sewage treatment system and technology thereof

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Embodiment 1

[0027] Embodiment one: combine below figure 1 Illustrate the oxidation ditch denitrification and phosphorus removal sewage treatment system of the present embodiment, it comprises the denitrification and phosphorus removal reaction unit 10 and the solid-liquid separation unit 20 that are connected, and the denitrification and phosphorus removal reaction unit 10 comprises the anaerobic tank 101 and The oxidation ditch 102 and the solid-liquid separation unit 20 include a secondary settling tank 201 , a deep dissolved air tank 202 and an air flotation tank 203 connected in sequence, and the output end of the oxidation ditch 102 is connected with the input end of the secondary settling tank 201 .

[0028] Further, the air flotation tank 203 communicates with the input end of the anaerobic tank 101 through a pipeline.

[0029] In the denitrification and phosphorus removal reaction unit 10, the input end of the anaerobic tank 101 is connected with the sewage inlet A, and the sewage...

Embodiment 2

[0035] Embodiment two: combine below figure 1 The oxidation ditch denitrification and phosphorus removal wastewater treatment process of the present embodiment includes the following steps:

[0036] 1. Anaerobic phosphorus release reaction: Sewage first enters the anaerobic zone 101, and the sewage to be treated is mixed with the concentrated sludge returned to the anaerobic zone 101 from the air flotation tank 203. The hydraulic retention time is 1.5h, and anaerobic phosphorus release reaction occurs; the activated sewage The phosphorus accumulating bacteria in the mud degrade the phosphorus-accumulating particles (poly-P) in the body to generate energy and release phosphate. At the same time, the phosphorus accumulating bacteria absorb the short-chain fatty acids in the sewage to form PHB and store them in the cells.

[0037] 2. Nitrification and denitrification reaction: the effluent of the anaerobic pool 101 enters the anoxic zone of the oxidation ditch 102, and the denitr...

Embodiment 3

[0044] Example Three: Combining figure 1 Illustrate the oxidation ditch denitrification and dephosphorization sewage treatment process of the present embodiment, and embodiment two is different, in step four, the depth of dissolved air deep pool 202 is 30m, and the air supply position of air compressor is 20m away from liquid surface; Step In step five, the conveying ratio of concentrated activated sludge accounts for 60% of the total amount of return sludge in step four.

[0045] Based on the concentration of activated sludge in the air flotation tank of 20000mg / L, when the reflux ratio is 60%, according to the above formula, the concentration of concentrated sludge in the denitrification and phosphorus removal reaction unit is 7500mg / L.

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Abstract

The invention provides an oxidation ditch nitrogen and phosphorus removal sewage treatment system and a technology of the treatment system, and relates to the technical field of sewage treatment. The oxidation ditch nitrogen and phosphorus removal sewage treatment system aims to the problems that in the existing treatment system, the sewage treatment capacity in the unit area is limited to cause waste of facilities and equipment, the solid-liquid separation efficiency is low, and the sludge concentration effect is bad, as the gravity precipitation technology is utilized, so that the treatment capacity is low. The system comprises a nitrogen and phosphorus removal reaction unit and a solid-liquid separation unit, which are communicated with each other, wherein the nitrogen and phosphorus removal reaction unit comprises an anaerobic tank and an oxidation ditch, which are sequentially communicated; the solid-liquid separation unit comprises a secondary sedimentation tank; the output end of the oxidation ditch is communicated with the input end of the secondary sedimentation tank; the system further comprises a dissolved gas deep tank and a floatation tank, which are communicated; the output end of the secondary sedimentation tank is communicated with the input end of the dissolved gas deep tank. The technology of the treatment system comprises the following steps: 1. anaerobic phosphorus-releasing reaction, 2. nitrification-denitrification reaction, 3. sludge-water separation, 4. gas dissolving in the deep tank, and 5. solid-liquid separation. The oxidation ditch nitrogen and phosphorus removal sewage treatment system is particularly applicable to modification works of an oxidation ditch sewage treatment plant.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system for nitrogen and phosphorus removal combined with deep pool air flotation and oxidation ditch and its process. Background technique [0002] Oxidation Ditch (OD) is a circulating mixed aeration tank or a circulating mixed activated sludge method, which was first invented by Professor A. Pasveer of the Netherlands National Institute of Health (TND). Since its appearance in 1954, oxidation ditch technology has been extensively researched and developed at home and abroad. [0003] However, with the increase in urban sewage treatment capacity and treatment requirements, many oxidation ditch sewage treatment plants are facing the dilemma of needing upgrading because their effluent can no longer meet the requirements. Direct expansion of new projects not only requires a large amount of engineering investment, but also requires additional construction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 邹伟国沈昌明谭学军丁玉平
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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