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Improved oxidation channel city sewage treamtent process

A technology of urban sewage and treatment process, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. Poor effect and other problems, to achieve low operating costs, less investment, and reduce the concentration of phosphorus

Inactive Publication Date: 2005-03-30
CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP
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AI Technical Summary

Problems solved by technology

[0004] The oxidation ditch water treatment process in the prior art has the defect that the sludge age is relatively long. Since the sludge is not treated anaerobically before the sludge is returned, the phosphorus removal effect is poor, only about 50%
In addition, the whole process still has the disadvantages of high engineering cost and large floor space.

Method used

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  • Improved oxidation channel city sewage treamtent process
  • Improved oxidation channel city sewage treamtent process
  • Improved oxidation channel city sewage treamtent process

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Embodiment Construction

[0025] The specific embodiment of the present invention is further illustrated by accompanying drawing: see attached figure 1 : The process steps in the figure are:

[0026] (1) Coarse and fine grille

[0027] Coarse and fine screens are the first process in the improved oxidation ditch urban sewage treatment process. Its function is to salvage large and small pieces of floating objects in the water, such as plastic bags, branches, cardboard, etc., from the sewage, and prevent these floating objects from entering the subsequent lifting pump station and damaging the water pump.

[0028] (2), sewage lifting pump station

[0029] The sewage lifting pump station is the second process in the improved oxidation ditch urban sewage treatment process. Its function is to lift the sewage to the design height and provide the water head height for the artesian flow of water in the subsequent process.

[0030] (3), Vortex grit chamber

[0031] The vortex grit chamber is the third proce...

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PUM

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Abstract

The improved type oxidation channel urban sewage treatment process is characterized by that the detritus pool adopts eddy flow detritus pool, before the returned sludge is returned into oxidization channel, said sludge must be undergone the process of anaerobic treatment for 1-2 hr.; the design parameters of the improved oxidization channel are as follows: sludge aye is 10-15 days, and sludge concentration is 4000-5000 mg / L, water outlet of the improved oxidization channel is placed in the oxygen-enriched zone of downstream of aeration machine or independently-set forced aeration zone, and its sedimentation tank adopts a peripheral intake and peripheral discharge type. Said invention eliminates the sludge concentration pool, and adopts an integrated sludge concentration dehydration machine to make concentration and dehydration of residual sludge. Its phosphorous-removing efficiency is up to above 87%.

Description

Technical field [0001] The invention relates to an improved oxidation ditch urban sewage treatment process suitable for urban sewage treatment plants with strict requirements on phosphorus and nitrogen removal and areas with strict phosphorus removal requirements. technical background [0002] Oxidation ditch, also known as oxidation ditch, is named for its structure in the shape of a closed ring ditch. It is a variant of the activated sludge method, which is equivalent to a delayed aeration system. Because the mixed solution of sewage and activated sludge circulates continuously in the aeration channel, some people also call it "circulating aeration tank" and "endless aeration system". [0003] The first urban sewage treatment plant using the oxidation ditch process was built in Voschoding, the Netherlands in 1954. Since the 1960s, oxidation ditch sewage treatment technology has been rapidly promoted and applied in Europe, North America, South America, Australia and other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/00C02F3/30C02F9/02C02F9/14C02F11/12
Inventor 申纪军赵隽贤
Owner CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP
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