Rainwater filtering and purifying device and filtering method

Abstract

The invention relates to a rainwater filtering and purifying device and a filtering method. The purifying device at least comprises a buoy coarse filter screen, a suspended partition wall, a sludge collecting tank, a sludge collecting net, a mud discharging pipe and a thin wire filter screen, wherein the buoy coarse filter screen is arranged between a water inlet and the suspended partition wall.When raining, the rainwater flows into the rainwater filtering and purifying device through a water inlet pipe; when the water level rises, buoys at both sides of the buoy coarse filter screen float to drive the entire buoy coarse filter screen to rotate from the vertical state to the horizontal state, and the inflowing water is preliminarily filtered; after the preliminarily filtered water is secondarily filtered by the thin wire filter screen arranged at the nozzle of a drain pipe to obtain secondarily filtered water; when the rainfall process is completed, the water level in the device drops, the buoy coarse filter screen returns to the vertical state, large particles and plastic floating objects on the buoy coarse filter screen flow into a collecting device in the sludge collecting tank along with the remaining water flow, and the remaining sewage in the entire device is discharged from a sludge pipe at the bottom. The rainwater filtering and purifying device and the filtering method provided by the invention have the advantages of increasing the filtering speed, improving the purifying efficiency, facilitating operation and reducing cost.

Description

technical field [0001] The invention belongs to the technical field of rainwater utilization and water supply and drainage, and in particular relates to a rainwater filtration and purification device and a filtration method. Background technique [0002] my country is currently facing a serious shortage of water resources. The purification of sewage, especially the secondary utilization of rainwater, is an important part of energy conservation and environmental protection. Every time it rains, there is a huge pressure on the rainwater pipe network in the city. In order to promote the timely drainage of rainwater, and to improve the water quality through preliminary purification through physical processes during the drainage process, the urban stormwater management system that focuses on rainwater collection and utilization is being continuously improved. The collection of rainwater is mainly roof rainwater and road surface rainwater, but the water quality is poor. At presen...

AI Technical Summary

Problems solved by technology

The collection of rainwater is mainly roof rainwater and road rainwater, but the water quality is poor

At present, rainwater collection and utilization facilities are mostly equipped with initial rainwater abandonment facilities and rainwater collection facilities with filtration systems, which are complicated to construct, high in investment costs, and easy to block during the filtration process and difficult to clean.

The public patent CN204898776U, 2015-12-23 mentions rainwater filtration in a rainwater filtration and storage device, but there are the following problems: 1. The structure of the filter sheet (14) is composed of two layers of barbed wire and a layer of filter membrane, wherein the pores of the filter membrane Small, easy to block, and in order to ensure the filtration speed, it is necessary to pressurize one side of the filtration. Under the normal pressure inside the device, the existence of the filter membrane slows down the filtration speed, which will easily cause too much water to accumulate in the device and fail to work normally. discharge

2. After the precipitation is completed, the sludge is directly discharged from the sludge discharge pipe (10), and the large and small particles are mixed, which is easy to block the nozzle, causing the device to fail to operate normally

3. The method of replacing the filter membrane in the filter of the device is to manually go down the well to take the filter as a whole to the well, replace the filter membrane in the middle of the wire mesh and clean the double-layer wire mesh. The operation is difficult and unsafe

Public patent CN207016579U, 2018-02-16. A rainwater sedimentation filter device also has the problem that the filter membrane pores in the filter sheet (11) are small, and the sludge after the precipitation is completed is directly discharged from the sludge discharge pipe (6)

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