Co-built Carrousel Oxidation Ditch

Abstract

The invention relates to a combined Carroussel oxidation ditch. A ditch body consists of a left area, a middle area and a right area, which are parallel to one another, the left area comprises an anoxia pond and an anaerobic pond, which are arranged in a way of one above the other and share one pond wall I, the shared pond wall I is provided with a water flow channel, the middle area comprises a two-ditch annular oxidation ditch, the two-ditch annular oxidation ditch and the anoxia pond share a pond wall II which is provided with an upstream water flow channel, an area I between the anoxia pond and the two-ditch annular oxidation ditch forms a nitrification liquid refluxing pond, the anoxia pond and the nitrification liquid refluxing pond share a pond wall III which is provided with a wall-through pump which is used for pumping the nitrification liquid back to the anoxia pond, and a shared pond wall IV of the nitrification liquid refluxing pond and the two-ditch annular oxidation ditch is provided with a water flow channel; two settling pond and the carroussel oxidation ditch are integrated into a whole body, so that the floor occupation area is reduced, and the investment cost is reduced.

Description

technical field [0001] The invention relates to a jointly built Carrousel oxidation ditch, which belongs to the Carrousel oxidation ditch category and belongs to the technical field of water treatment. Background technique [0002] The traditional Carrousel oxidation ditch is composed of an outer ditch and several second-ditch oxidation ditch in series. It is a multi-ditch series system. After the influent and sludge are mixed, they flow continuously in the ditch along the direction of water flow. In the ditch, an inverted umbrella-shaped vertical surface aerator is installed at one end of the pool, forming an oxygen-enriched area near the downstream of the aerator and an anoxic area upstream of the aerator. One set of ditch is installed to meet the requirements of deeper oxidation ditch. The mixed liquid is fully mixed in the medium, and can maintain a high mass transfer efficiency, overcome the defects of small oxidation ditch, shallow depth, poor mixing effect, etc., and ...

AI Technical Summary

Problems solved by technology

[0002] The traditional Carrousel oxidation ditch is composed of an outer ditch and several second-ditch oxidation ditch in series. It is a multi-ditch series system. After the influent and sludge are mixed, they flow continuously in the ditch along the direction of water flow. In the ditch, an inverted umbrella-shaped vertical surface aerator is installed at one end of the pool, forming an oxygen-enriched area near the downstream of the aerator and an anoxic area upstream of the aerator. One set of ditch is installed to meet the requirements of deeper oxidation ditch. The mixed liquid is fully mixed in the medium, and can maintain a high mass transfer efficiency, overcome the defects of small oxidation ditch shallow depth, poor mixing effect, etc., and the equipment is not compact

[0003] 1. The secondary settling tank and regulating tank are set outside the ditch, which occupy a large area and the equipment is not compact;

[0004] 2. The number of surface aerators is small, the free flow of mixed liquid in the ditch is long, and the uneven flow rate caused by turbulent flow may cause sludge deposition and affect the operation effect;

[0005] 3. It is difficult to avoid the contradiction between oxygen supply and stirring, especially in the case of low water quality, in order to achieve energy saving effect, the speed of the surface aerator must be reduced, which will sharply weaken the stirring ability, resulting in serious precipitation and sludge accumulation;

[0006] 4. For large and medium-sized oxidation ditches, the water depth should not exceed 3.5m, and the average dissolved oxygen in a single-ditch oxidation ditch should be maintained at about 2mg / L. Otherwise, underwater propellers should be added, and the investment and cost will increase

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