CN201512826U - Sand filter wall split rainwater treatment system - Google Patents

Abstract

The utility model belongs to a rainwater collection and treatment device, in particular to a sand filter wall type split rainwater treatment system. It includes a rainwater collection channel arranged not to exceed the ground surface, a settling device and a reservoir connected to each other arranged in sequence along the water flow direction, and a filter layer is provided in the reservoir; A filter wall, the sand filter wall separates the reservoir into interval-distributed rainwater collection tanks and clear water tanks, and the sand filter wall includes at least one layer of permeable coarse sand and fine sand stacked longitudinally along the direction from the rainwater collection tank to the clean water tank layer composition. The utility model solves the problems of complex structure and poor rainwater treatment effect in the prior art, and has the advantages of small occupied area, treated rainwater can be used according to needs, and good treatment effect.

Description

Sand filter wall split rainwater treatment system

Technical field

The utility model belongs to a rainwater collection and treatment device, in particular to a sand filter wall type split rainwater treatment system.

Background technique

At present, more than 40 countries and regions around the world have carried out or are carrying out experimental research on the utilization of urban rainwater resources.

Germany uses public rainwater pipes to collect rainwater, and rainwater collected from roofs, surrounding streets, parking lots and passages enters underground storage tanks through independent rainwater pipes. Pollution of rainwater, as well as reduction and purification of rainwater with decentralized source ecological measures. After simple treatment, it is used for flushing toilets and watering gardens.

Denmark collects rainwater from rooftops in urban areas, and the collected rainwater passes through pre-filtration equipment at the bottom of the collection pipes and enters the storage tank for storage. When used, it is filtered through a float filter for flushing toilets and washing clothes.

Japan began to build flood storage tanks for flood detention and rainwater storage in 1963, and the rainwater from the flood storage tanks was also used for urban miscellaneous water such as spraying roads and irrigating green spaces. Most of these facilities are built underground to make full use of the underground space.

The use of rainwater in cities in my country started relatively late, and the use of rainwater in large and medium-sized cities is basically in the stage of exploration and research. Beijing, Shanghai, Dalian, Xi'an and other cities have successively carried out research. From the beginning of 1990, Beijing carried out the research project of "Research on Utilization of Rainstorm and Flood". Through the preliminary research on the effect of the roof-infiltration well system and the lawn to store rainwater, the countermeasures and technical measures for the utilization of rainwater in Beijing urban area are put forward.

The above-mentioned prior art has defects to varying degrees, such as relatively complex structures, or relatively poor rainwater treatment effects.

Utility model content

The purpose of this utility model is to provide a sand filter wall type split rainwater treatment system, which uses the sand filter wall structure as the main means of rainwater treatment to achieve the purpose of reducing the main pollution factors SS and COD _mn in rainwater.

Overall technical scheme of the present utility model is:

The sand filter wall split rainwater treatment system includes a rainwater collection channel 1 arranged not above the ground surface, a settling device and a reservoir connected to each other arranged in sequence along the water flow direction, and a filter layer is provided in the reservoir; The filter layer is a sand filter wall arranged longitudinally in the middle of the reservoir. The sand filter wall divides the reservoir into rainwater collection ponds 5 and clean water ponds 8 distributed at intervals. The sand filter wall includes longitudinal It consists of at least one layer of water-permeable coarse sand layer 10 and fine sand layer 13 respectively.

It should be further explained that the utility model includes but is not limited to reasonably setting an effective layer of middle sand layer between the coarse sand layer 10 and the fine sand layer 13 according to needs, and the grain size of the gravel in the middle sand layer is between the coarse sand layer and the fine sand layer 13. Between the gravel particle size of the layer and the fine sand layer, the gravel in each structural layer of the sand filter wall is arranged according to the principle from coarse to fine along the rainwater flow direction, which does not deviate from the essence of the utility model.

Concrete technical solutions of the utility model also have:

In order to ensure the shaping of the sand filter wall and the positioning between the structural layers, a preferred embodiment is that the outer surface of the sand filter wall is covered with a positioning wire mesh 11, and the adjacent coarse sand layer 10 and fine sand layer 13 A separating screen 12 is provided.

The preferred particle size range of the gravel is: the particle size of the gravel in the coarse sand layer 10 is 12-17 mm, and the particle size of the gravel in the fine sand layer 13 is 10-15 mm.

In order to ensure that the dirty rainwater in the rain collection tank 5 flows into the clean water tank 8, the preferred structure is that the sand filter wall is fixed to the bottom of the reservoir, and the junction of the two is a non-permeable solid wall structure 14.

In order to prevent the dirt in the rainwater collection channel from flowing into the rainwater collection tank 5 too much, the sedimentation device is preferably a separate or interval series sedimentation tank 3 communicated with the rainwater collection channel 1 .

In order to prevent the dirt from accidentally falling into the sedimentation tank 3, a preferred embodiment is that the upper surface of the sedimentation tank 3 is provided with a grate plate 2.

In order to prevent dirt from falling into the reservoir 3 accidentally, and to facilitate water use and maintenance, the upper surface of the reservoir is provided with a protective cover 6, and the surface of the protective cover 6 is provided with an inspection port 4 communicated with the reservoir.

In order to achieve the purpose of water intake more conveniently, the preferred water intake method is that the water delivery pipe 7 of the submersible pump is arranged in the reservoir, and its water outlet is opened outside the reservoir through the inspection port 4 .

The technical progress achieved by the utility model is:

1. The split structure is adopted to fully realize the dual-purpose function of a pool: watering the courtyard has low water quality requirements, and the rainwater from the rain collection pool can be directly used; green land irrigation and flushing toilets have high water quality requirements, and the clear water pool rainwater can be used. At the same time, the box-type rain collection is adopted, which is easy to clean, saves labor and labor, and greatly reduces the cost of rainwater quality treatment.

2. A sand filter wall is built in the reservoir to filter the collected rainwater. A solid wall with an effective height is left at the bottom of the gravel wall, which can effectively prevent dirty rainwater from flowing into the clear water pool for discharge or cleaning after the rainy season.

3. Using this system to treat rainwater quality can reduce the area occupied by rainwater quality treatment, and can be widely used in rainwater collection and storage in non-chemically polluted places such as urban and regional agencies, troops, and schools; the treated rainwater can generally be used for green land irrigation , flushing toilets and watering gardens, etc.

4. The sampling test shows that the main pollution factors of rainwater in the hospital area are SS and COD _mn , and the water quality before rainwater runoff treatment is poor, with SS being 220mg/L and COD _mn being 150mg/L. After being treated by this system, SS and COD _mn decreased significantly, down to 20mg/L and 15mg/L respectively. After 24 hours of natural precipitation of rainwater by using the reservoir, the removal rate of COD _mn can reach more than 50%, which basically meets the index requirements of domestic miscellaneous water.

Description of drawings

The accompanying drawings of the utility model have:

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is a partially enlarged view of part A in Fig. 1 .

Detailed ways

The embodiments of the utility model will be further described below in conjunction with the accompanying drawings, but it should not be construed as a limitation of the utility model, and the protection of the utility model is subject to the contents recorded in the claims.

The overall structure of this embodiment is as shown in the figure, which includes a rainwater collection channel 1 arranged not above the ground surface, a settling device and a reservoir connected to each other arranged in sequence along the water flow direction, and a filter layer is provided in the reservoir ; The filter layer is a sand filter wall arranged vertically in the middle of the reservoir, which separates the reservoir into rainwater collection ponds 5 and clean water ponds 8 distributed at intervals, and the sand filter wall includes Each layer of water-permeable coarse sand layer 10 and fine sand layer 13 are stacked vertically.

The outer surface of the sand filter wall is covered with a positioning wire mesh 11 , and a separating wire mesh 12 is arranged between the adjacent coarse sand layer 10 and fine sand layer 13 .

The particle size of the gravel in the coarse sand layer 10 is 12-17 mm, and the particle size of the gravel in the fine sand layer 13 is 10-15 mm.

In order to ensure that the dirty rainwater in the rain collection tank 5 flows into the clean water tank 8, the preferred structure is that the sand filter wall is fixed to the bottom of the reservoir, and the junction of the two is a non-permeable solid wall structure 14. The solid wall structure is a brick wall with a concrete-coated surface.

The sedimentation device selects a separate sedimentation tank 3 connected with the rainwater collection channel 1 .

The upper surface of the sedimentation tank 3 is provided with a grate plate 2 .

The upper surface of the reservoir is provided with a protective cover 6, and the surface of the protective cover 6 is provided with an inspection port 4 communicating with the reservoir. The water delivery pipe 7 of the submersible pump is arranged in the reservoir, and its water outlet is opened outside the reservoir through the inspection port 4 .

Claims (9)

1. Sand filter wall type split rainwater treatment system, including the rainwater collection channel (1) arranged on the surface of the ground, the settling device and the storage tank which are arranged in sequence along the water flow direction and connected with each other. There is a filter layer; it is characterized in that the filter layer is a sand filter wall arranged longitudinally in the middle of the reservoir, and the sand filter wall separates the reservoir into rainwater collection pools (5) and clear water pools (8) distributed at intervals. The sand filter wall is composed of at least one layer of permeable coarse sand layer (10) and fine sand layer (13) vertically stacked along the direction from the rain collecting tank (5) to the clear water tank (8). 2. The sand filter wall type split rainwater treatment system according to claim 1, characterized in that the outer surface of the sand filter wall is covered with a positioning wire mesh (11), and the adjacent coarse sand layer (10) A separating screen (12) is arranged between the fine sand layer (13). 3. The sand filter wall type split rainwater treatment system according to claim 1, characterized in that the grain size of the coarse sand layer (10) is 12-17mm. 4. The sand filter wall type split rainwater treatment system according to claim 1, characterized in that the grain size of the fine sand layer (13) is 10-15mm. 5. The sand filter wall type split rainwater treatment system according to claim 1 or 2, characterized in that the sand filter wall is fixed to the bottom of the reservoir, and the junction of the two is an impermeable entity Wall Structures (14). 6. The sand filter wall type split rainwater treatment system according to claim 1, characterized in that the settling device is selected from separate or spaced series settling tanks (3) connected to the rainwater collection channel (1). 7. The sand filter wall type split rainwater treatment system according to claim 7, characterized in that the upper surface of the sedimentation tank (3) is provided with a grate plate (2). 8. The sand filter wall type split rainwater treatment system according to claim 1, characterized in that the upper surface of the reservoir is provided with a protective cover (6), and the surface of the protective cover (6) is opened to communicate with the reservoir. inspection opening (4). 9. The sand filter wall type split rainwater treatment system according to claim 8, characterized in that the water delivery pipe (7) of the submersible pump is arranged in the reservoir, and its water outlet is opened in the reservoir through the inspection port (4) external.

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