Wet land technique for deep purification of tail water of sewage plant

Abstract

The invention discloses a wetland process for deep purification of tail water of a sewage plant, which comprises the tail water of the sewage plant, a limestone filter pool, a submerged plant oxidation pond, a vertical-flow wetland, a surface-flow wetland, a composite substrate filter pool, an ecological reoxygenation pond and a receiving water body. The wetland process has the characteristics of efficient and ecological denitrification and dephosphorization, utilizes a water head with the height of about 0.5m to automatically flow, has the hydraulic load of 200mm/d, has no energy consumption and drug consumption, is anti-clogging, and can perpetually and steadily operate with low cost; the removal rate of nitrogen and phosphorus is higher than 95 percent, and the water quality of water output is superior to the GB3838-2002 ground surface class III water standard. The wetland process is suitable for the deep purification of the tail water of small sewage plants in cities and towns, and the treated output water can be recycled in water-deficient areas and can serve as a high-quality water source for the supply of water bodies of landscapes in the cities or residential areas. The process needs larger land area which can be merged into a whole with green areas and wetland parks of the cities. In the sewage plant of Eryuan county, Yunnan province, the process is utilized to build 2.2 hectares of wetland engineering for the deep purification of the tail water, the daily water treatment capacity is 4,000m<3>, the sewage plant has been steadily operated for 5 years, and the annual operation management cost is fifty thousand yuan.

Description

Technical field: [0001] Sewage deep purification and reuse engineering technology. The invention relates to a structured wetland process, which is used for the deep purification of tail water of a sewage plant, and the effluent reaches the national standard surface class III water without any energy consumption and chemical consumption, and the treatment cost per ton of water is less than 0.10 yuan. This engineering technology is applicable to the deep purification of tail water of sewage plants in small cities and towns to achieve the goals of sewage reuse in water-scarce areas and water pollution prevention and control in highly sensitive areas. Background technique: [0002] In arid and water-scarce areas, the tail water of sewage plants is a kind of water resource with relatively stable water quantity and quality, and the reuse value after deep purification is relatively high; in highly sensitive areas, the tail water of sewage plants is an important source of pollution....

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