Method and rainwater garden system for synchronous resourceful treatment of reclaimed water

Abstract

The invention provides a method and a rainwater garden system for synchronous resourceful treatment of reclaimed water and belongs to the technical field of water resource utilization. Collection, treatment and recycling of rainwater and the reclaimed water are integrated into flower beds, lawns and landscape gardens of constructed wetlands, and non-point and point source pollution of cities is solved. An artificial filter bed system of the rainwater garden is subjected to cold-resistant enhancement treatment by cold-resistant vegetation, thermal insulation, potential level water distributionand aeration; pollutants in the rainwater and the reclaimed water are rapidly and efficiently degraded by iron-substrate biological particle carriers. The system is suitable for rapid resourceful treatment of the rainwater and the reclaimed water at different temperatures in different regions and different seasons. Quality of effluent of the system meets water quality requirements of surface watersources of greening and domestic drinking water, so that not only is water resource saved, but also the black-odor problem caused by long-term storage of the rainwater in the sponge city developmentprocess is solved, and production of a black and odorous water body can be effectively prevented. Industrialization can be realized, and the method and the system have good market prospect and promotional value.

Description

technical field [0001] The invention relates to a method for synchronously recycling reclaimed water and a rain garden system, belonging to the technical field of water resources utilization. Background technique [0002] With the acceleration of urbanization in my country, the natural permeability and roughness of the urban surface continue to decrease, resulting in a significant reduction in the amount of infiltrated rainwater, resulting in the vast majority of urban rainfall that can only be discharged through surface runoff, resulting in continuous urban surface runoff. In recent years, some large and super-large cities in my country have frequently experienced the phenomenon of "seeing the sea". Large areas of urban waterlogging have caused serious impacts on urban construction, development and people's lives. [0003] At the same time, urbanization is accompanied by the continuous concentration of population, which increases the emission intensity of urban life and ind...

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Problems solved by technology

[0008] The rain garden is an ecological purification technology, but the rain garden system still has the following technical bottlenecks in the treatment of rainwater and reclaimed water: ① The temporal and spatial distribution of urban rainwater quality and quantity is complex, which causes a large impact load on the rain garden system, causing the system The water quality of the effluent is unstable; ②The water permeability of the surface soil of the rain garden system is low, and the erosion of the rainwater causes the soil to infiltrate, which may easily cause the blockage of the wetland system; The system is paralyzed; ④ Urban rainwater carries a large amount of heavy metals, while the ordinary rain garden system has limited ability to remove heavy metals; ⑤ The nitrogen concentration in the middle water is still high, but the BOD concentration is low, and the organic carbon source required for biological denitrification is insufficient , making it difficult for the rain garden system to achieve deep denitrification of reclaimed water

[0009] Therefore, there is still no report of a rain garden system that can adapt to the temporal and spatial distribution characteristics of urban rainwater, has high load, low temperature resistance, and can integrate into urban ecological landscape while realizing deep resource treatment of rainwater and reclaimed water.

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