Strengthening pretreatment structure for rainwater discharge outlet of port bulk cargo storage yard

Abstract

The utility model discloses an enhanced pretreatment structure for a rainwater discharge outlet of a port bulk cargo storage yard. The enhanced pretreatment structure comprises a filter screen box and a mounting bracket, 2-3 filtering layers are arranged in the filtering net box, and a net-shaped partition plate is arranged between every two filtering layers; from top to bottom, the voidage among the filter materials in each filter layer is gradually reduced; the supporting groove is fixed to the vertical side wall where a wharf front edge discharging opening is located, and the supporting groove is located below the discharging opening. The filter screen box is arranged on the surface of the bracket; and the upstream face of the bracket is a vertical baffle to form a groove shape. The utility model has the technical effects and advantages that: 1, various pollutants in the bulk cargo storage yard in the harbor district can be effectively removed, and the removal efficiency of main pollutants in the rainwater in the early stage is high; 2, the floor area is small, the outflow capacity is strong, the concealment is good, and the basic functions of flood control and drainage of the rainwater pipe network can be effectively ensured; and 3, no power consumption is consumed in operation, so that the comprehensive engineering investment is less, the operation cost is low, the system has strong water quality impact load resistance, the operation is simple, and the maintenance is easy.

Description

Technical Field

[0001] The utility model relates to the field of pollution control, and more specifically to a reinforced pre-treatment structure for a rainwater discharge outlet of a port bulk cargo yard. Background Art

[0002] Materials piled in the open air at the bulk cargo yard in the port area are easily washed by rainwater runoff, which can lead to excessive SS, chromaticity, heavy metals and petroleum hydrocarbons in the runoff rainwater. In particular, since rainwater washes the materials in the bulk cargo yard during the entire rainfall process, the bulk cargo yard is polluted with a large amount of rainwater, the initial rainwater collection time is long, and the treatment volume is large, which may cause environmental hazards to the receiving waters. However, if the rainwater in the bulk cargo yard is fully collected in a collection pool, the pool capacity will be large, the construction cost will be high, and the port area has a compact functional layout and relatively tight construction land. Generally, there are no conditions for building large rainwater storage pools or collection pools. Studies have shown that suspended matter entrained in the early rainwater runoff and oily substances left over from ground vehicles are the main contributors to pollutants, while dissolved pollutants account for a relatively low proportion, and pollutants are generally concentrated in the early stage of rainfall. Therefore, taking certain engineering measures to reduce the concentration of suspended matter and oil in the rainwater runoff from the port bulk cargo yard before the rainfall, as an auxiliary purification measure after the rainwater storage tank or collection tank is full, will effectively avoid the pollution of the nearshore water environment caused by the direct discharge of rainwater runoff from the bulk cargo yard into the sea.

[0003] On the other hand, a large amount of pollutants deposited last time are often accumulated in the port area's rainwater pipe network. Every rainy season, these pollutants will be washed into the receiving waters with rainwater runoff. Since the pollutants are at the end of the pipe network, the port area's initial rainwater front-end collection and treatment measures are difficult to take effect. However, due to factors such as design and construction technology, construction costs, and natural slope, the end of the port bulk cargo yard often uses a gravity drainage mode with limited outflow capacity. Therefore, more complex rainwater runoff pollution control measures may further limit the drainage capacity of the port yard rainwater pipe network, and even cause waterlogging in the port area.

[0004] Therefore, it is particularly necessary to develop a facility for rapid reduction of rainwater runoff pollutants at the end of bulk cargo yards that can not only effectively ensure the basic functions of the yard's rainwater pipe network such as flood control and drainage, but also save land. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a reinforced pretreatment structure for a rainwater discharge outlet of a port bulk cargo yard.

[0006] The technical solution of this utility model is as follows:

[0007] A reinforced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard, comprising: a filter box, a mounting bracket;

[0008] The filter box is provided with 2-3 filter layers inside, and mesh partitions are provided between each filter layer; from top to bottom, the gap between filter materials in each filter layer decreases;

[0009] The bracket is fixed on the vertical side wall where the discharge port is located at the front of the wharf, and the bracket is below the discharge port; the filter box is arranged on the surface of the bracket; and the water-facing surface of the bracket is a vertical baffle to form a trough shape.

[0010] Furthermore, the top filter layer is filled with oil adsorbent material or light filter material.

[0011] Furthermore, the filling height H1 of the top filter layer oil absorption layer is 10 to 20 cm high, and the filling heights H2 and H3 of the second and third suspended matter filter layers are 20 to 40 cm; the length L of the cage is greater than the diameter of the drain outlet, and the width W of the cage is determined by the distance H0 between the upper edge of the cage and the drain outlet and the diameter D of the drain outlet. In order to ensure that the drain outlet can smoothly discharge clean rainwater in the later stage, it is set to 2 / 3H0<W<H0+D / 2.

[0012] Furthermore, a handle is provided above the net box for hoisting.

[0013] Furthermore, the width of the bracket is the width of the cage + 5 to 20 cm, and the length is the length of the cage + 5 to 20 cm.

[0014] Technical effects and advantages of the utility model:

[0015] 1. It can effectively remove various pollutants in the bulk cargo yard of the port area, and has a high efficiency in removing the main pollutants in the early rainwater.

[0016] 2. It occupies a small area, has strong outflow capacity and good concealment, and can effectively ensure the basic functions of the rainwater pipe network such as flood control and drainage.

[0017] 3. There is no power consumption during operation, so the comprehensive project investment is small, the operating cost is low, the system has strong resistance to water quality impact load, simple operation and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of three-layer filtering layer;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the filter box. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1:

[0023] (1) Make filter box

[0024] The filter box 1 is woven from galvanized alloy steel wire and is divided into three layers, with a removable mesh partition 11 made of galvanized alloy steel wire between each layer. The first layer is an oil adsorption material layer, such as polypropylene fiber bundles, fiber balls, etc., which is used to absorb the oil mixed in the rainwater runoff of the bulk cargo yard due to washing the ground. The second and third layers are both lightweight filter material layers, such as activated carbon, quartz sand, ceramsite, magnetic sand, etc., which are used to filter the suspended matter mixed in the rainwater runoff of the bulk cargo yard. If the concentration of oil in the rainwater runoff is low, the first layer can be cancelled or other lightweight filter materials can be filled in the first layer, but the filling of each layer of filter material should ensure that the voids between the filter materials are the first layer> the second layer> the third layer.

[0025] The length, width and height of the cage can be adjusted according to the diameter of the drainage outlet, the type and concentration of pollutants in the rainwater runoff of the port bulk cargo yard, and the height of the drainage outlet from the water surface of the receiving water body. Typically, the filling height H1 of the first layer of oil absorption layer is 10-20cm high, and the filling heights H2 and H3 of the second and third layers of suspended matter filtration layers are 20-40cm. The length L of the cage should be at least greater than the diameter of the drainage outlet. The width W of the cage is determined by the distance H0 between the upper edge of the cage and the drainage outlet and the diameter D of the drainage outlet. In order to ensure the smooth discharge of clean rainwater from the drainage outlet, generally 2 / 3H0<W<H0+D / 2.

[0026] In order to facilitate the installation of the net box, replacement of filter materials, backwashing, etc., a handle 12 should be provided above the net box for hoisting.

[0027] (2) Install bracket 2

[0028] A reinforced concrete bracket is installed below the drain outlet 4 for installing the cage. The bracket is fixed to the vertical side wall 5 where the drain outlet is located at the front of the wharf by anchor bolts 3. The width of the bracket is the width of the cage + 5 to 20 cm, and the length of the bracket is the length of the cage + 5 to 20 cm. To prevent the cage from shifting under rain erosion, a baffle 21 with a vertical height of not less than 1 / 4H should be set on the water-facing surface of the bracket to form a trough. The baffle and the bottom plate of the bracket are cast in one piece.

[0029] (3) Cage use and maintenance

[0030] Since the runoff velocity is low and the outflow angle is small in the early stage of rainfall, the runoff with a high degree of pollution in the early stage can all flow through the cage, and the pollutants will be trapped in the cage through filtration and adsorption. The purified rainwater will flow into the receiving water body 6 through the mesh holes around the cage. As the runoff flow rate gradually increases, the outflow angle also increases. When the outflow angle exceeds the cage width W, the clean rainwater in the later stage will directly flow into the receiving water body, thereby ensuring smooth drainage of the drainage outlet and avoiding waterlogging in the port area.

[0031] Depending on the degree of pollutants mixed in rainwater runoff, before the rainy season, at the end of the rainy season, after every 2 to 3 rainfalls, and when the cages are found to be seriously blocked, the lifting equipment in front of the dock should be used to lift the cages ashore for filter material replacement or backwashing. The backwash water will flow through the rainwater grate into the port's initial rainwater treatment facilities for treatment.

[0032] Embodiment 2:

[0033] The diameter of the rainwater outlet of a coal and ore storage yard is 1000mm. The runoff rainwater is mixed with sand and gravel fine powder, as well as a certain concentration of oil and heavy metals dissolved from the ore.

[0034] The filter mesh box is woven from 4mm galvanized alloy steel wire and is divided into 3 layers. The first layer is filled with 15cm high polypropylene fiber balls to absorb the oil and dirt mixed in the rainwater runoff of the bulk cargo yard due to washing the ground. The second layer is filled with 15cm high activated carbon to absorb the heavy metal ions mixed in the rainwater runoff. The third layer is filled with 10cm high quartz sand with an average diameter of 32mm. The length of the mesh box is L = 1200mm, and the width is W = 1000mm. A handle made of galvanized alloy steel wire is set above the mesh box for hoisting.

[0035] A concrete bracket is installed 1500mm below the drain outlet. The bracket is 1400mm long and 1200mm wide, and a 10cm high baffle is set to prevent the cage from shifting.

[0036] The cage can effectively remove heavy metals, oil and suspended particles in the runoff rainwater of bulk cargo yard. The polypropylene fiber balls and activated carbon in the cage must be replaced regularly, and the quartz sand can be recycled after backwashing.

[0037] Embodiment 3:

[0038] The bulk material yard of sand and gravel at a certain port has a rainwater outlet diameter of 1500mm. The runoff rainwater is mixed with high concentrations of sand, gravel and fine powder.

[0039] The diameter of the rainwater outlet at the front of the wharf is 1500mm. The filter cage is woven from 5mm galvanized alloy steel wire and is divided into two layers. The first layer is filled with 15cm high volcanic rocks with an average diameter of 5-10cm, and the second layer is filled with 15cm high volcanic rocks with an average diameter of 3-5cm. The cage length L = 2000mm, width W = 1000mm. A handle woven from galvanized alloy steel wire is set above the cage for hoisting.

[0040] A concrete bracket is installed 1000mm below the drain outlet. The bracket is 2100mm long and 1400mm wide, and an 8cm high baffle is set to prevent the cage from shifting.

[0041] The cage can effectively remove suspended particles from the runoff rainwater from the port's bulk cargo yard through two-stage filtration. The volcanic rocks in the cage can be recycled after backwashing.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reinforced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard, characterized in that: include: Filter box, mounting bracket; The filter box is provided with 2-3 filter layers inside, and mesh partitions are provided between each filter layer; From top to bottom, the voids between filter materials in each filter layer decrease; The bracket is fixed on the vertical side wall where the discharge port is located at the front of the wharf, and the bracket is below the discharge port; the filter box is arranged on the surface of the bracket; and the water-facing surface of the bracket is a vertical baffle to form a trough shape.

2. The enhanced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard according to claim 1 is characterized by: The top filter layer is filled with oil-absorbing material or light filter material.

3. The enhanced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard according to claim 1 is characterized by: The filling height H1 of the top filter layer oil absorption layer is 10-20cm high, and the filling heights H2 and H3 of the second and third suspended matter filter layers are 20-40cm; the length L of the cage is greater than the diameter of the drain outlet, and the width W of the cage is determined by the distance H0 between the upper edge of the cage and the drain outlet and the diameter D of the drain outlet. In order to ensure the smooth discharge of clean rainwater from the drain outlet in the later stage, it is set to 2 / 3H0<W<H0+D / 2.

4. The enhanced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard according to claim 1, characterized in that: A handle is provided above the net box for hoisting.

5. The enhanced pretreatment structure for rainwater discharge outlet of a port bulk cargo yard according to claim 1, characterized in that: The width of the bracket is the width of the cage + 5 to 20 cm, and the length is the length of the cage + 5 to 20 cm.

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