Stepwise function-intensified biological and ecological oxidation pond and method for deeply purifying water quality

Abstract

The invention discloses a stepwise function-intensified biological and ecological oxidation pond, which comprises peripheral bank slopes and an oxidation pond, wherein the peripheral bank slopes are formed by paving ecological concrete prefabricating balls; aquatic plants are planted on the slopes; a soft surrounding baffle wall for blocking the water and guiding the flow is arranged in the oxidation pond; and the soft surrounding baffle wall successively divides the oxidation pond into three functional regions, such as a facultative oxygen pond, an aerobic pond and an aquatic plant pond. Theinvention also discloses a method for deeply purifying the water quality by utilizing the ecological oxidation pond. The biological and ecological oxidation pond has the advantages that each functional region in the biological and ecological oxidation pond is carried out with the special function establishment design according to the requirements of the water quality; the system can eliminate dissoluble organic matters, nitrogen and phosphorus nutritive salts and suspension solids in the water at high efficiency; the deep purification of the tail water in a sewage treatment plant is realized;and the tail water after being treated is discharged after reaching the first grade A standard all the year around.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment engineering, and in particular relates to a biological ecological oxidation pond for treating tail water of urban sewage treatment plants and a method for deeply purifying water quality by using the biological ecological oxidation pond. Background technique [0002] The overall water pollution control situation in my country is very severe, and the eutrophication trend of lakes such as Taihu Lake, Chaohu Lake and Dianchi Lake has not been effectively controlled. In order to improve the water environment quality of the above-mentioned lake basins, the state has put forward a requirement for the urban sewage treatment plants within the basin to raise the standard, that is, the discharge tail water of the sewage treatment plants is required to be upgraded from the second-level or first-level B standard to the first-level A Standard (GB18918-2002) or stricter emission requirements. As the ta...

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Problems solved by technology

However, there are also some defects in traditional oxidation ponds. The removal function of traditional oxidation ponds is to remove organic matter. Therefore, a delayed aeration method is usually adopted for the entire pond body to enhance the removal effect of COD, while the removal effect of nitrogen and phosphorus is relatively low. Difference

The tail water after the secondary treatment of the urban sewage treatment plant has the characteristics of small carbon-nitrogen ratio and high proportion of nitrate in TN, etc. Physicochemical water purification process cannot effectively remove dissolved nitrogen and phosphorus in the water

In addition, the traditional oxidation pond occupies a large area, the operation effect is unstable, and the environmental sanitation is poor, which limits its wide application.

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