A constructed wetland system for controlling black and odorous water bodies and its operating method

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to an artificial wetland system for treating a black and odorous water body and an operation method of the artificial wetland system. The artificial wetland system comprises a water inlet area, a water purifying area, a water outlet area, an aeration system and a sampling openingport; the water inlet area isarranged at the front end of the water purifying area; a water inlet is designed in the outer side of the water inlet area, and small holes are evenly distributed in the inner side of the water inletarea; the water purifying area is sequentially filled with a first-layer matrix, a second-layer matrix, a third-layer matrix, a fourth-layer matrix and a soil layer from bottom to top; the aeration system is mounted at the bottom of the front end of the water purifying area; the water outlet area is arranged at the rear end of the water purifying area; a water outlet is formed in the outer side of the water outlet area, and the water outlet and the water inlet keep the relative height difference; and the height of the water inlet is greater than the maximum height of the soil layer, the wateroutlet is parallel to the height of the fourth-layer matrix in height. The artificial wetland system conducts aeration for eight hours every day, the gas-water ratio is 10:1, and the hydraulic retention time is 2 d. According to the artificial wetland system, the purification effect on pollutants in the black and odorous water body is improved obviously, the transparency is improved well, and thepungent smell is relieved well.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an artificial wetland system for controlling black and odorous water bodies and an operating method thereof. Background technique [0002] Black and odorous water is an extreme phenomenon of water pollution. The water is black and has a pungent stench. On the one hand, black and odorous water affects people's sensory experience, and on the other hand, it will produce hydrogen sulfide (H 2 S) and ammonia (NH 3 ) and other harmful gases will breed mosquitoes and pathogenic bacteria in a high temperature environment, endangering human health. The content of dissolved oxygen (DO) in black and odorous water is low, and low oxygen content will affect aerobic animals, plants and microorganisms in the water, and even cause their death. According to the survey, among the 295 prefecture-level and above cities across the country, 218 cities have found black and smell...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low DO content, poor ammonia nitrogen treatment effect, poor odor purification effect and easy saturation of matrix, which is not conducive to long-term operation in existing horizontal subsurface flow constructed wetlands, and proposes a constructed wetland system for controlling black and odorous water bodies and its run method

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