A system for collecting, purifying and reusing rainwater at a dock

Abstract

The present invention discloses a system for collecting, purifying and reusing rainwater at a dock, and relates to the technical field of collecting and reusing initial rainwater at a dock. The system consists of a vortex sand settling rainwater well, a rainwater garden and a recycling unit; the vortex sand settling rainwater well consists of a rainwater well body, a water inlet pipe, a sponge concrete water delivery channel and an overflow pipe; the sponge concrete water delivery channel is built with sponge concrete; the rainwater garden consists of a planting layer, a medium layer and a drainage layer from top to bottom; multi-layer immobilized small balls of composite bacteria are evenly distributed inside the medium layer; the recycling unit consists of an underground water collection tank and a recycling pump. The rainwater purified by the rainwater garden is collected by the underground water collection tank, and transported to dock water points such as yard water points, road water points, green belt water points and living area water points through the recycling pump. The present invention can effectively collect rainwater on the bulk cargo dock surface, increase the infiltration rate of rainwater, reduce the rainwater runoff, and improve the rainwater quality. It can be directly used as water for flushing the dock surface, reducing rainwater runoff pollution and saving water resources. It has the advantages of simple and compact structure, low operating cost, easy control, high rainwater reuse rate, and environmental friendliness.

Description

Technical Field

[0001] The invention belongs to the technical field of collecting and reusing initial rainwater at a dock, and in particular provides a system for collecting, purifying and reusing rainwater at a dock. Background Art

[0002] At present, in ports and docks, most rainwater is discharged directly, resulting in waste. In the general building structures of ports and docks, most of the rainwater collection, purification and reuse of dock rainwater are not realized. Instead, drainage ditches are generally set horizontally on the dock, that is, drainage ditches are set parallel to the direction of the dock beams, and the water is discharged from both sides of the dock to the middle drainage ditch. However, this method results in a very low collection and utilization rate of initial rainwater on the dock surface, and most of the rainwater cannot effectively flow into the drainage ditch, causing the initial rainwater to flow directly into the natural water body, causing pollution to the natural water body and waste of rainwater resources.

[0003] At the same time, there is currently a lack of efficient dock rainwater collection, purification and reuse systems. Therefore, how to achieve efficient collection, purification and reuse of dock rainwater is a key issue that needs to be solved now. The present invention combines the design concept of "sponge city", adheres to the principles of green, ecological and environmental protection, and designs and develops a dock rainwater collection, purification and reuse system based on the water quality characteristics of the initial dock rainwater. Summary of the invention

[0004] In order to solve the technical difficulties in the collection, purification and reuse of dock rainwater and the lack of an efficient dock rainwater collection, purification and reuse system, the present invention provides a dock rainwater collection, purification and reuse system which has a simple and compact structure, low operating cost, is green and environmentally friendly, easy to control and has a high rainwater reuse rate.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a dock rainwater collection, purification and reuse system of the present invention, the system is composed of a vortex sand settling type rainwater well (1), a rainwater garden (2) and a reuse unit (3); the vortex sand settling type rainwater well (1) is composed of a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water channel (1-3) and an overflow pipe (1-4); the sponge concrete water channel (1-3) is built with sponge concrete; the rainwater garden (2) is composed of a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) from top to bottom; the inside of the medium layer (2-2) is evenly distributed with multi-layer immobilized small balls (2-5) of composite bacteria; the reuse unit (3) is composed of an underground water collection tank (3-1) and a reuse pump (3-3).

[0006] In the above-mentioned dock rainwater collection, purification and reuse system, the rainwater well body (1-1) is cylindrical, and a simple step (1-5) is installed on its inner wall; the water inlet pipe (1-2) is tangent to the rainwater well body (1-1); the sponge concrete water channel (1-3) is radially installed on one side of the rainwater well body (1-1), parallel to the water inlet pipe (1-2), and its installation height is lower than the water inlet pipe (1-1), and a filter screen (1-6) is arranged at its outlet; the overflow pipe (1-4) is radially installed on the side of the rainwater well body (1-1), and is axially perpendicular to the water inlet pipe (1-2); the height of the overflow pipe (1-4) is lower than the sponge concrete water channel (1-3).

[0007] In the above-mentioned dock rainwater collection, purification and reuse system, the raw materials for preparing the sponge concrete include aggregate, cement, binder, foaming agent, anti-cracking agent, microbial agent and water; the porosity of the sponge concrete is greater than 40%, the water permeability coefficient is greater than 2mm / s, and the maximum water holding rate is greater than 50%.

[0008] In the above-mentioned dock rainwater collection, purification and reuse system, drought-resistant and flood-resistant plants (2-6) are planted on the planting layer (2-1); the drought-resistant and flood-resistant plants (2-6) are one or more of iris, canna, reed and calamus; the thickness of the planting layer (2-1) is 300-400mm; the composite bacterial community multi-layer immobilization ball (2-5) is composed of an inner core and an outer layer embedding material, wherein the inner core is made of anaerobic ammonia oxidation granular sludge (4-1), and the outer layer embedding material is made of aerobic nitrification granular sludge (4-2). ; The thickness of the medium layer (2-2) is 400-500 mm, and the filler is filled therein; the filler is a mixture of biological retention medium, zeolite or expanded clay, and straw in a mass ratio of 10-20:0.5-2:1; the biological retention medium includes soil, river sand and pine bark; the thickness of the drainage layer (2-3) is 300-400 mm, and gravel with gradually increasing particle sizes are arranged in sequence from top to bottom, and a water collection pipe (2-4) is provided at the bottom; the diameter of the water collection pipe (2-4) is DN100-DN150.

[0009] In the above-mentioned dock rainwater collection, purification and reuse system, the underground water collection tank (3-1) collects rainwater purified by the rain garden and is connected to a reuse pump (3-3) through a reuse pipe (3-2); the reuse pump (3-3) transports the purified rainwater in the water collection tank (3-1) to the yard water point (3-4), the road water point (3-5), the green belt water point (3-6) and the living area water point (3-7).

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] (1) A vortex sedimentation rainwater well is set up at the front end of the rainwater garden as a pretreatment unit, which greatly reduces the suspended matter concentration of rainwater entering the rear end rainwater garden. Not only does it greatly reduce the sediment in the pipe, but it also avoids the reduction of the pollutant treatment capacity and flow capacity of the rear end rainwater garden due to excessive suspended matter concentration in the rainwater.

[0012] (2) The sponge concrete water channel in the vortex sedimentation rainwater well is constructed with sponge concrete, which can further reduce the pollution concentration in the rainwater. In addition, the sponge concrete has high permeability, and some rainwater can penetrate the sponge concrete to replenish groundwater.

[0013] (3) The small expanded clay and straw in the filler of the rain garden medium layer are modifiers. The small expanded clay is easy to form a biofilm and can absorb pollutants in the water. The straw has good water permeability and water retention, is natural and environmentally friendly, and saves water and fertilizer. This filler structure is conducive to removing pollutants in the water and maintaining soil moisture.

[0014] (4) The rain garden medium layer is filled with composite bacterial multilayer immobilized beads, so that the biological efficiency of anaerobic ammonium oxidation granular sludge and aerobic nitrification granular sludge can be coordinated to achieve the coordinated operation of aerobic nitrification reaction and anaerobic ammonium oxidation reaction; the method for preparing the composite bacterial multilayer immobilized beads is simple, and the production process is easy to control. The obtained composite bacterial multilayer immobilized material has high water content, high mechanical strength and can be reused; at the same time, the characteristics of high biological concentration and strong environmental adaptability of immobilized microbial technology are utilized, and it has the advantages of low cost, high efficiency and ecology.

[0015] (5) Rainwater gardens can reduce 80% of suspended solids and other pollutants in rainwater, and the effluent quality can meet very high water quality standards, ensuring the quality of recycled water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system for collecting, purifying and reusing rainwater at docks.

[0017] Figure 2 This is a top view of a vortex sand settling type rainwater well.

[0018] Figure 3 This is a schematic diagram of the rain garden structure.

[0019] Figure 4 It is a schematic diagram of the composite bacterial community multilayer immobilization material.

[0020] Legend:

[0021] DETAILED DESCRIPTION

[0022] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0023] Example 1

[0024] As shown in the accompanying drawings, a system for collecting, purifying and reusing rainwater at a dock of the present invention comprises a vortex grit-setting rainwater well (1), a rainwater garden (2) and a recycling unit (3); the vortex grit-setting rainwater well (1) comprises a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water channel (1-3) and an overflow pipe (1-4); the rainwater garden (2) is provided with a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) in order from top to bottom; multi-layer immobilized small balls (2-5) of a composite bacterial community are distributed inside the medium layer (2-2); the recycling unit (3) comprises an underground water collection tank (3-1) and a recycling pump (3-3); the vortex grit-setting rainwater well (1) is arranged below a permeable road surface, and rainwater The garden (2) is arranged inside the greening area, and the recycling unit (3) is arranged behind the storage yard; the cyclone sand settling rainwater well (1) conveys rainwater to the rainwater garden (2) through a sponge concrete water delivery channel (1-3) and an overflow pipe (1-4), and the rainwater garden (2) is connected to the recycling unit (3) through a connecting pipe (2-8); the collected rainwater can be recycled after being treated by the cyclone sand settling rainwater well (1) and the rainwater garden (2); the recycling unit (3) recycles the rainwater purified by the rainwater garden (2) in the underground water collection tank (3-1) to the storage yard water point (3-4), the road surface water point (3-5), the green belt water point (3-6) and the living area water point (3-6) through a recycling pump (3-3).

[0025] The rainwater well body (1-1) is cylindrical, with a simple step (1-5) installed on the inner wall. The water inlet pipe (1-2) is tangent to the rainwater well body (1-1). The sponge concrete water channel (1-3) is radially installed on one side of the rainwater well body (1-1), parallel to the water inlet pipe (1-2), lower in height than the water inlet pipe (1-1), and a filter screen (1-6) is arranged at the outlet; the overflow pipe (1-4) is radially installed on the side of the rainwater well body (1-1), axially perpendicular to the water inlet pipe (1-2), and lower in height than the sponge concrete water channel (1-3). When it rains, a large amount of rainwater flows into the water inlet pipe (1-2) through the surface path, and then spirally descends along the inner wall of the rainwater well body (1-1). During the descent process, larger particle pollutants are gathered in the center of the swirling water column by the swirling effect and sink quickly. The rainwater moves from bottom to top. During the rising process of the water flow, due to its own gravity, the smaller particle pollutants remaining in the rainwater can settle to the bottom of the rainwater well body (1-1). The water flow at the bottom of the rainwater well body (1-1) is stable, and the sediment after sedimentation is not easily stirred up. There are fewer particle pollutants in the rainwater entering the overflow pipe (1-4), and the pipe sediment is also reduced. When the water surface in the overflow well reaches the outlet of the sponge concrete water channel (1-3), the filter net (1-6) installed at the outlet of the sponge concrete water channel (1-3) can effectively intercept floating objects in the water, such as leaves. When inspecting and desilting the rainwater well, the staff can go down to the well along the simple stairs (1-5) to carry out work.

[0026] The sponge concrete water channel (1-3) is built with sponge concrete, and the raw materials for preparing the sponge concrete include aggregate, cement, binder, foaming agent, anti-cracking agent, microbial agent and water; the porosity of the sponge concrete is greater than 40%, the water permeability coefficient is greater than 2mm / s, and the maximum water holding rate is greater than 50%. During rainfall, the sponge concrete water channel (1-3) can not only collect rainwater that penetrates into the ground from the permeable road surface, but also transport excess rainwater in the vortex sedimentation rainwater well (1), and at the same time perform secondary filtration on the rainwater and adsorb pollutants. Part of the rainwater flows to the rain garden (2) through the sponge concrete water channel (1-3), and part of the rainwater penetrates the sponge concrete water channel (1-3) to replenish groundwater.

[0027] The planting layer (2-1) is planted with drought-resistant and flood-resistant plants (2-6), and the drought-resistant and flood-resistant plants (2-6) are a combination of irises and reeds.

[0028] The planting layer (2-1) is 400 mm thick, the planting layer (2-1) is covered with soil, the soil is 100 mm thick, the medium layer (2-2) is 500 mm thick, the drainage layer (2-3) is 400 mm thick, gravel with gradually increasing particle sizes are arranged in sequence from top to bottom, and a water collecting pipe (2-4) is provided at the bottom, and the diameter of the water collecting pipe (2-4) is DN150.

[0029] The composite bacterial community multilayer immobilization ball (2-5) consists of an inner core and an outer layer of embedding material, wherein the inner core is made from anaerobic ammonia oxidation granular sludge (4-1), and the outer layer of embedding material is made from aerobic nitrification granular sludge (4-2).

[0030] The medium layer (2-2) contains filler, which is a mixture of biological retention medium, zeolite and straw, and the mass ratio of the biological retention medium, small ceramsite and straw is 18:1:1.

[0031] Example 2

[0032] One difference between Example 2 and Example 1 is that the drought-resistant and flood-resistant plants are a combination of iris, canna, reed and calamus.

[0033] The rainwater collection, purification and reuse system of the dock includes a vortex grit rainwater well, a rainwater garden and a reuse unit; the vortex grit rainwater well includes a rainwater well body, a water inlet pipe, a sponge concrete water channel and an overflow pipe; the rainwater garden is provided with a planting layer, a medium layer and a drainage layer from top to bottom; the inside of the medium layer is distributed with multi-layer immobilized small balls of complex bacteria; the reuse unit includes an underground water collection tank and a reuse pump; the vortex grit rainwater well is arranged below the permeable pavement, the rainwater garden is arranged inside the greening area, and the reuse unit is arranged behind the yard. The vortex grit rainwater well transports rainwater to the rainwater garden through the sponge concrete water channel and the overflow pipe, and the rainwater garden is connected to the reuse unit through a connecting pipe; the collected rainwater can be recycled after being treated by the vortex grit rainwater well and the rainwater garden. The recycling unit recycles the rainwater in the underground water collection tank that has been purified by the rain garden to water points in the yard, on the road surface, in the green belt and in the living area through a recycling pump.

[0034] The rainwater well body is cylindrical, and a simple step is installed on the inner wall. The water inlet pipe is tangent to the rainwater well body. The sponge concrete water channel is radially installed on one side of the rainwater well body, parallel to the water inlet pipe, and lower in height than the water inlet pipe. A filter screen is arranged at the outlet; the overflow pipe is radially installed on the side of the rainwater well body, axially perpendicular to the water inlet pipe, and the overflow pipe is lower in height than the sponge concrete water channel.

[0035] The sponge concrete water delivery channel is built with sponge concrete. The raw materials for preparing the sponge concrete and their weight fractions include 100-150g of aggregate, 10-20g of cement, 3-8g of binder, 0.5-2g of foaming agent, 0.2-1g of anti-cracking agent, and 2-20g of water. The aggregate is mainly zeolite, limestone, vermiculite, slag, quartz stone or gravel. The cement is one or more of magnesia material and calcium silicate material cement. The binder is one or more of epoxy resin adhesive, unsaturated polyester resin adhesive, styrene-butadiene adhesive, acrylic resin adhesive and polyurethane adhesive. The foaming agent is mainly a physical foaming agent including a composite foaming agent. and the biosurfactant or chemical foaming agent includes two or more of hydrogen peroxide, calcium carbide and ammonium salt; the anti-cracking agent is one or more of polypropylene fiber, polyethylene fiber, carbon fiber, glass fiber and oil palm fiber; the preparation steps of the sponge concrete are mainly aggregate screening and grading - primary mixing and stirring - secondary mixing, aeration and stirring - tertiary mixing and stirring - casting and molding - curing; the recycling steps of the sponge concrete are mainly mechanical crushing - ultrasonic stripping - aggregate sorting and regeneration - residual material crushing and regeneration; the porosity of the sponge concrete is greater than 40%, of which the volume of pores with a diameter of 0.4-2mm accounts for more than 60%, the water permeability coefficient is greater than 2mm / s, and the maximum water holding rate exceeds 50%.

[0036] The planting layer is 300-400mm thick, the planting layer is covered with soil, the soil is 100mm thick, the medium layer is 400-500mm thick, the drainage layer is 300-400mm thick, gravel with gradually increasing particle sizes are arranged from top to bottom, and a water collecting pipe is provided at the bottom, and the diameter of the water collecting pipe is DN100-DN150.

[0037] The immobilized multi-layer composite bacterial community material is mainly composed of anaerobic ammonium oxidation granular sludge, denitrification granular sludge, aerobic nitrification granular sludge and an embedding agent; the anaerobic ammonium oxidation granular sludge is the inner core, and the particle size is 3-8 mm; the denitrification granular sludge and aerobic nitrification granular sludge are the outer layer embedding materials, and the mass ratio of denitrification granular sludge: aerobic nitrification granular sludge is 1:1; the embedding agent is prepared by mixing polyvinyl alcohol, sodium alginate and water in a mass ratio of 8:1:100.

[0038] The medium layer contains filler, which is a mixture of biological retention medium, zeolite and straw. The mass ratio of the biological retention medium, small ceramsite and straw is 18:1:1. The biological retention medium includes soil, river sand and pine bark, and the straw is corn or rice straw.

Claims

1. A system for collecting, purifying and reusing rainwater at a dock, characterized by: The system consists of a vortex sand settling rainwater well (1), a rain garden (2) and a recycling unit (3); the vortex sand settling rainwater well (1) consists of a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water channel (1-3) and an overflow pipe (1-4); the rainwater well body (1-1) is cylindrical, and a simple step (1-5) is installed on its inner wall; the water inlet pipe (1-2) is tangent to the rainwater well body (1-1); The sponge concrete water channel (1-3) is radially installed on one side of the rainwater well body (1-1), parallel to the water inlet pipe (1-2), and its installation height is lower than the water inlet pipe (1-1), and a filter screen (1-6) is arranged at its outlet; the overflow pipe (1-4) is radially installed on the side of the rainwater well body (1-1), and is axially perpendicular to the water inlet pipe (1-2); the height of the overflow pipe (1-4) is lower than the sponge concrete water channel (1-3); the sponge concrete water channel (1-3) is built with sponge concrete; the rainwater garden (2) is composed of a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) from top to bottom; the planting layer (2-1) is 300-400 mm thick, and is planted with drought-resistant and waterlogging-resistant plants (2-6); the composite bacterial community multilayer immobilized small balls (2-5) are evenly distributed inside the medium layer (2-2); the composite bacterial community multilayer immobilized small balls (2-5) are uniform ...). The ball (2-5) is composed of an inner core and an outer layer of embedding material, wherein the inner core is made of anaerobic ammonia oxidation granular sludge (4-1), and the outer layer of embedding material is made of aerobic nitrification granular sludge (4-2); the medium layer (2-2) is filled with filler; the filler is a mixture of biological retention medium, zeolite or ceramsite, and straw in a mass ratio of 10-20:0.5-2:1; the recycling unit (3) is composed of an underground water collection tank (3-1) and a recycling pump (3-3).

2. A dock rainwater collection, purification and reuse system according to claim 1, characterized in that: The raw materials for preparing the sponge concrete include aggregate, cement, binder, foaming agent, anti-cracking agent, microbial agent and water; the porosity of the sponge concrete is greater than 40%, the water permeability coefficient is greater than 2mm / s, and the maximum water holding rate is greater than 50%.

3. The system for collecting, purifying and reusing dock rainwater according to claim 1 is characterized by: The planting layer (2-1) is planted with drought-resistant and flood-resistant plants (2-6); the drought-resistant and flood-resistant plants (2-6) are one or more of iris, canna, reed and calamus; the thickness of the medium layer (2-2) is 400-500 mm; the bioretention medium comprises soil, river sand and pine bark; the thickness of the drainage layer (2-3) is 300-400 mm, and gravels with gradually increasing particle sizes are arranged in sequence from top to bottom, and a water collection pipe (2-4) is provided at the bottom; the diameter of the water collection pipe (2-4) is DN100-DN150.

4. The system for collecting, purifying and reusing dock rainwater according to claim 1 is characterized by: The underground water collection tank (3-1) collects rainwater purified by the rain garden and is connected to a recycling pump (3-3) via a recycling pipe (3-2); the recycling pump (3-3) transports the purified rainwater in the water collection tank (3-1) to a water point (3-4) in a storage yard, a water point (3-5) on a road surface, a water point (3-6) in a green belt, and a water point (3-7) in a living area.

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