Improved integrated oxidation ditch

An oxidation ditch, an improved technology, applied in chemical instruments and methods, aerobic and anaerobic process treatment, water/sludge/sewage treatment, etc., can solve the problems of low oxygenation power efficiency, small water depth of oxidation ditch, and land occupation Large area and other problems, to achieve stable treatment effect, stable effluent water quality, and reduce the occupied area

Inactive Publication Date: 2016-06-29
YUNNANWATER INVESTMENT CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention optimizes and improves these shortcomings of the traditional integrated oxidation ditch, in order to allow the integrated oxidation ditch to be more widely used. By adding an anaerobic reaction tank (4) at the water inlet (7) of the integrated oxidation ditch, Set up a sludge return system to improve the removal efficiency of phosphorus and organic matter, and use microporous aeration to overcome the shortcomings of general oxidation ditch such as small water depth, low oxygenation power efficiency, high energy consumption, and large floor area.

Method used

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Embodiment 1

[0019] Zhenxiong County Sewage Treatment Plant, Zhaotong City, Yunnan Province: The construction scale is 25,000 m in the near future 3 / d, the main process of the sewage treatment plant adopts an improved integrated oxidation ditch process of the present invention such as figure 1 As shown, the hydraulic retention time of the biochemical reaction section is 11.5h, of which the anaerobic zone is 1.5h, the anoxic zone is 2.5h, and the aerobic zone is 7.5h. Dimensions of the integrated oxidation ditch: Φ48.0m×5.6m (two), the effective volume of the single-tank biochemical reaction section is 5270m 3 , the effective water depth is 5m, the ditch width is 9m, and the size of the secondary settling tank located in the center of the integrated oxidation ditch: Φ30.0m×4.7m. Design sludge concentration MLSS=4000mg / L, sludge load is 0.053kgBOD 5 / (kgMLSS·d), the sludge return ratio is 100%.

[0020] The wastewater treatment plant is designed to have influent BOD of 100mg / L, COD of 22...

Embodiment 2

[0024] Embodiment 2: as Figure 1 ~ Figure 3 As shown, an improved integrated oxidation ditch management device includes an oxidation ditch, a secondary settling tank, and a single-pipe dredger 3. The single-pipe dredger 3 is built in the bottom of the secondary settling tank, and the oxidation ditch is distributed in a ring shape. Around the ring-shaped secondary sedimentation tank, the oxidation ditch includes an anaerobic tank, anoxic section 5, and aerobic section 6. The oxidation ditch and the secondary sedimentation tank are connected to each other, and the water from the inner circle of the oxidation ditch enters the secondary sedimentation tank, and the secondary sedimentation tank The bottom sludge is discharged through the single-pipe suction dredger 3, which combines the dual flow characteristics of push flow and complete mixing. The mixed liquid of sewage and activated sludge circulates in the oxidation ditch, which makes the oxidation ditch in the direction of wate...

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Abstract

The invention discloses an improved integrated oxidation ditch which is characterized in that an A2O process, an annular oxidation ditch and a secondary sedimentation tank are combined fully.The oxidation ditch achieves the intermittent aerobic and anoxic process, the center of a round reaction tank is provided with a radial flow type sedimentation tank, an anaerobic reaction tank is added to an air inlet of the oxidation ditch and is subject to combined construction together with the oxidation ditch, sludge flows back to the anaerobic reaction tank, and micropores are adopted for aeration so as to overcome the shortcomings that an ordinary oxidation ditch is small in water depth, low in aeration power efficiency and high in energy consumption.The improved integrated oxidation ditch has the advantages that the oxidation ditch is stable in treatment effect, good in nitrogen and phosphorus removal effect, stable in outlet water quality and resistant to impact load, the space occupied by a treatment facility is small, per ton water investment is saved, and the running cost is low; and the improved integrated oxidation ditch is suitable for small and medium sewage treatment plants having the nitrogen and phosphorus removal requirements.

Description

technical field [0001] The present invention relates to a method using A 2 The integrated oxidation ditch of the O process is specifically an improved integrated oxidation ditch that is fully combined with the ring-shaped oxidation ditch and the secondary sedimentation tank, and is equipped with a mud return system to improve the effect of nitrogen and phosphorus removal. Background technique [0002] Oxidation ditch process is a form of sewage treatment process developed in the early 1950s. Because of its simple structure and easy maintenance and management, it was widely used soon. So far, it has developed into various forms, mainly including: Passveer single ditch type, Orbal concentric circle type, integrated oxidation ditch, Carrousel circular baffle type, D type double ditch type and T type three ditch type, etc. [0003] The integrated oxidation ditch is an improved activated sludge method, which combines A 2 The O process is combined with the annular oxidation ditc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/301C02F2203/006
Inventor 刘旭军黄云建陈向文赵炳萍
Owner YUNNANWATER INVESTMENT CO LTD
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