Cascade treatment and purification system and method for black and odorous rivers

Abstract

The invention discloses a cascade treatment and purification system and method for a black and odorous river. The cascade treatment and purification system comprises a subsurface flow wetland purification river reach, a surface flow wetland purification river reach, a near-natural beach land purification river reach and a near-natural pollution reduction river reach which are sequentially arranged on a main river channel from a sewage estuary to a downstream river, an in-situ purification island and a subsurface wetland are arranged on the subsurface flow wetland purification river reach, and an internal electrolysis matrix is arranged in the in-situ purification island; a side groove connected with the main river channel is formed in the surface flow wetland purification river reach, and a surface flow constructed wetland is arranged in the side groove; a side seepage ditch with the head end and the tail end connected with the main river channel is arranged on the near-natural beach land purification river reach, and side seepage walls are arranged on the two sides of the side seepage ditch respectively; and a river center island is arranged on the near-natural pollution reduction river reach, and indigenous stain-resistant plants are planted on the river center island and the main river channel. The system and method are suitable for treatment and purification of heavy-pollution black and odorous rivers lack of natural runoff, and main incoming water of the heavy-pollution black and odorous rivers is treated town sewage and industrial wastewater.

Description

technical field [0001] The invention relates to the technical field of river treatment, in particular to a cascade treatment and purification system and method for black and odorous rivers. Background technique [0002] With the rapid development of the economy and society, the discharge of production and domestic wastewater has increased significantly. After a large amount of wastewater is discharged into the river, the content of COD, nitrogen and phosphorus pollutants in the river is too high, far exceeding the self-purification capacity of the water body, causing the water body Oxygen-deficient and black-smelling state. Among them, oxygen-depleting pollutants such as COD and ammonia nitrogen are the main black and odor-causing substances. The physical and chemical environment of black and odorous water is strongly reducing. The water has peculiar smell, which is no longer suitable for aquatic organisms to survive. Fragmentation, serious imbalance in ecosystem structure...

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Problems solved by technology

There is also a purification method to control external pollution sources and ecologically restore black and odorous rivers. By adopting biological contact oxidation, sediment dredging, water supply, aeration and oxygenation, and restoration of animals and plants, etc., water pollution control and water pollution in black and odorous rivers can be achieved. The dual goals of ecological restoration, but the above-mentioned surface ecological purification treatment method is not suitable for rivers that lack natural runoff, the main incoming water is treated urban sewage and industrial wastewater, and the concentration of COD and ammonia nitrogen is much higher than that of surface water quality V In addition, the treated tail water has poor biodegradability and lack of carbon sources. It is difficult to solve it only by aeration and oxygenation. Microorganisms and submerged plants are also difficult to survive in this incoming water environment. poor effect

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