A bioretention pond for continuous treatment of incipient stormwater during dry spells

Abstract

The invention discloses a bio-retention pond capable of continuously processing initial rainwater in a drought period. The bio-retention pond comprises an adjusting area and a water storage area. The adjusting area comprises an adjusting tank, the adjusting tank is connected with a municipal rainwater pipe network, and the adjusting tank is internally provided with a water inlet communicated with the water storage area. The water storage area comprises a reservoir, a floating plate is hinged in the reservoir, and one end of the floating plate is equipped with a floating drum. The floating plate is equipped with a first sealing plate, the reservoir is equipped with a baffle floating block, and the bottom of the reservoir is equipped with a submersible sewage pump connected with a controller. The submersible sewage pump is connected with the bio-retention pond via a pressure water inlet pipe, and the bio-retention pond is provided with an overflow water return pipe connected with the reservoir. The initial rainwater can be individually collected and stored and used in association with the bio-retention pond, so that the high-pollution initial rainwater can be processed concentratedly, continuously and circularly. The bio-retention pond is environment-friendly, and is suitable for wide-range application in construction of sponge cities.

Description

technical field [0001] The invention relates to a biological retention pond capable of continuously treating initial rainwater in a drought period, and belongs to the municipal field. Background technique [0002] At this stage, the disposal of urban runoff rainwater is still at the stage of installing initial rainwater disposal devices in the rainwater pipe network, and there are very few related studies on the separate collection and treatment of initial rainwater. Related patents are often sloppy in collecting initial rainwater, using simple overflow collection devices, without considering the dilution and scouring effect of later rainwater on initial rainwater, and directly discharge the collected so-called "initial rainwater" into biological Detention ponds and other low-impact development technology facilities undergo advanced treatment, and the excess is discharged through overflow facilities, which directly leads to the discharge of real highly polluted rainwater int...

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Problems solved by technology

[0005] Another example is the invention patent (application number: 201510374873.3): the rainwater storage system for the initial stage of the road. This patent will cause the dilution effect of the later rainwater on the initial rainwater, so that the initial rainwater will be washed out of the system by the later rainwater and directly discharged into the surface water environment. , the high concentration of pollutants in the initial rainwater will cause harm to the environment, and it is also not conducive to the collection of the initial rainwater by the system

[0006] In addition, the general bioretention tank only has rainwater entering during the rainfall period, and the water storage capacity is not large. Especially in the old urban area, the green concave area is very limited, the volume of the bioretention tank is often small, and the water treatment capacity is limited. It is a pity that after the treatment of the rainwater from a single rainfall, the detention pond remains idle. Moreover, the pollution load of rainwater in the early stage of the old city is heavy, and the demand for removing pollutants in the runoff of rainwater is very urgent.

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