CN113529895A

CN113529895A - Wharf rainwater collecting, storing, purifying and recycling system

Info

Publication number: CN113529895A
Application number: CN202110828603.0A
Authority: CN
Inventors: 陈宏�; 袁吉成; 杨恩喆; 邓征宇; 罗桢; 章乘峰; 王�泓; 刘珂; 阳滔; 杨双林
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2021-10-22

Abstract

The invention discloses a wharf rainwater collecting, purifying and recycling system, and relates to the technical field of wharf initial rainwater collecting and recycling. The system consists of a rotational flow sand setting type catch basin, a rainwater garden and a recycling unit; the rotational flow sand setting type 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 by adopting sponge concrete; the rainwater garden sequentially consists of a planting layer, a medium layer and a drainage layer from top to bottom; multilayer immobilized pellets of the compound flora are uniformly distributed in the medium layer; the recycling unit consists of an underground water collecting tank and a recycling pump. The rainwater purified and treated by the rainwater garden is collected and stored by the underground water collecting tank and is conveyed to wharf water consumption points such as storage yard water consumption points, pavement water consumption points, green belt water consumption points, living area water consumption points and the like through a recycling pump. The rainwater collecting device can effectively collect rainwater on the bulk cargo wharf surface, increases the infiltration rate of the rainwater, reduces the runoff rate of the rainwater, improves the quality of the rainwater, can be directly used as the wharf surface flushing water, reduces the rainwater runoff pollution, saves the water resource, and has the advantages of simple and compact structure, low operation cost, easy control, high rainwater reuse rate, environmental friendliness and the like.

Description

Wharf rainwater collecting, storing, purifying and recycling system

Technical Field

The invention belongs to the technical field of wharf initial rainwater collection and reuse, and particularly provides a wharf rainwater collection, purification and reuse system.

Background

At present, in port and pier, most rainwater is direct discharge, causes the waste, and in the building structure of general port and pier, do not realize that the collection of pier rainwater holds purification and retrieval and utilization mostly, but generally adopt the mode that transversely sets up the escape canal at the pier, be on a parallel with the direction of pier crossbeam and set up the escape canal promptly, by the drainage of pier both sides side direction middle escape canal. However, the method causes the collection utilization rate of initial rainwater on the wharf surface to be very low, most of the rainwater cannot effectively flow into the drainage ditch, so that the initial rainwater directly flows into the natural water body, and the pollution to the natural water body and the waste of rainwater resources are caused.

Meanwhile, there is currently a lack of efficient wharf rainwater collection, purification and recycling systems. Therefore, how to realize the efficient collection, purification and reuse of wharf rainwater is a key problem to be solved at present. The invention combines the design concept of 'sponge city', inherits the principle of green, ecological and environmental protection, and designs and develops a wharf rainwater collection, purification and recycling system aiming at the water quality characteristics of wharf initial rainwater.

Disclosure of Invention

In order to solve the technical problems in collecting, purifying and recycling wharf rainwater and lack of an efficient wharf rainwater collecting, purifying and recycling system, the invention provides a wharf rainwater collecting, purifying and recycling system which is simple and compact in structure, low in operation cost, green and environment-friendly, easy to control and high in rainwater recycling rate.

In order to achieve the purpose, the invention adopts the following technical scheme: the invention relates to a wharf rainwater collecting, storing, purifying and recycling system, which consists of a rotational flow sand setting type rainwater well (1), a rainwater garden (2) and a recycling unit (3); the rotational flow sand setting type rainwater well (1) consists of a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water delivery channel (1-3) and an overflow pipe (1-4); the sponge concrete water delivery channels (1-3) are built by adopting sponge concrete; the rainwater garden (2) is sequentially composed of a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) from top to bottom; multilayer immobilized pellets (2-5) of the compound flora are uniformly distributed in the dielectric layer (2-2); the recycling unit (3) consists of an underground water collecting tank (3-1) and a recycling pump (3-3).

In the collecting, purifying and recycling system for the wharf rainwater, the rainwater well body (1-1) is cylindrical, and a simple ladder (1-5) is arranged on the inner wall of the rainwater well body; the water inlet pipe (1-2) is tangent to the rainwater well body (1-1); the sponge concrete water delivery channel (1-3) is arranged on one side of the rainwater well body (1-1) along the radial direction, is parallel to the water inlet pipe (1-2), is lower than the water inlet pipe (1-1) in installation height, and is provided with a filter screen (1-6) at the outlet; the overflow pipe (1-4) is radially arranged on the side edge of the rainwater well body (1-1) and is axially vertical to the water inlet pipe (1-2); the height of the overflow pipe (1-4) is lower than that of the sponge concrete water delivery canal (1-3).

In the wharf rainwater collecting, purifying and recycling system, the sponge concrete is prepared from the raw materials including aggregate, cement, a binder, a foaming agent, an anti-cracking agent, a microbial agent and water; the porosity of the sponge concrete is more than 40%, the water permeability coefficient is more than 2mm/s, and the maximum water retention rate is more than 50%.

In the wharf rainwater collecting, purifying and recycling system, drought-tolerant and waterlogging-resistant plants (2-6) are planted on the planting layer (2-1); the drought-enduring and waterlogging-resistant plant (2-6) is one or more of iris, canna, reed and calamus; the thickness of the planting layer (2-1) is 300-400 mm; the composite flora multilayer immobilized pellet (2-5) consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (4-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (4-2); the thickness of the dielectric layer (2-2) is 400-500 mm, and filling materials are filled in the dielectric layer; the filler is prepared from a biological retention medium, zeolite or ceramsite and straw according to a mass ratio of 10-20: 0.5-2: 1, mixing; the bioretention media includes soil, river sand and pine bark; the thickness of the drainage layer (2-3) is 300-400 mm, broken stones with gradually increased particle sizes are sequentially arranged from top to bottom, and a water collecting pipe (2-4) is arranged at the bottom; the pipe diameter of the water collecting pipe (2-4) is DN 100-DN 150.

In the wharf rainwater collecting, purifying and recycling system, the underground water collecting tank (3-1) collects rainwater purified by a rainwater garden and is connected with a recycling pump (3-3) through a recycling pipeline (3-2); the recycling pump (3-3) conveys the purified rainwater in the water collecting tank (3-1) to a storage yard water consumption point (3-4), a road surface water consumption point (3-5), a green belt water consumption point (3-6) and a living area water consumption point (3-7).

Compared with the prior art, the invention has the following advantages:

(1) the rotational flow sand setting catch basin is arranged at the front end of the rainwater garden and serves as a pretreatment unit, so that the concentration of suspended matters of rainwater entering the rear rainwater garden is greatly reduced, the sediment in a pipeline is greatly reduced, and the reduction of pollutant treatment capacity and overflowing capacity of the rear rainwater garden caused by the overhigh concentration of the suspended matters in the rainwater is avoided.

(2) The sponge concrete water delivery channel in the rotational flow sand setting rainwater well is constructed by adopting sponge concrete, so that the pollution concentration in rainwater can be reduced again, the permeability of the sponge concrete is high, and part of rainwater can permeate the sponge concrete to supplement underground water.

(3) The small ceramic particles and the straws in the filler in the medium layer of the rainwater garden are modifiers, the small ceramic particles are easy to form a film, can adsorb pollutants in water, have good water permeability and water retention property, are natural and environment-friendly, save water and fertilizer, and the filler structure is favorable for removing the pollutants in the water and keeping the soil moisture.

(4) Composite flora multilayer immobilized pellets are filled in the rainwater garden medium layer, so that the biological efficiency of the anaerobic ammonium oxidation granular sludge and the aerobic nitrification granular sludge is coordinately exerted, and the coordinative operation of the aerobic nitrification reaction and the anaerobic ammonium oxidation reaction is realized; the method for preparing the multilayer immobilized pellet of the composite flora is simple and convenient, the preparation process is easy to control, and the obtained multilayer immobilized material of the composite flora has high water content and high mechanical strength and can be repeatedly utilized; meanwhile, the method has the advantages of low cost, high efficiency, ecology and the like by utilizing the characteristics of high biological concentration and strong environmental adaptability of the immobilized microorganism technology.

(5) The rainwater garden can reduce 80% of suspended matters and other pollutants in rainwater, the quality of outlet water can reach a high water quality standard, and the quality of reuse water is guaranteed.

Drawings

Fig. 1 is a wharf rainwater collecting, storing, purifying and recycling system.

Fig. 2 is a top view of a cyclone sand setting type catch basin.

Fig. 3 is a schematic view of a rain garden structure.

FIG. 4 is a schematic view of a composite bacterial flora multilayer immobilization material.

Illustration of the drawings:

Detailed Description

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

Example 1

As shown in the attached drawing, the wharf rainwater collecting, storing, purifying and recycling system comprises a rotational flow sand setting type rainwater well (1), a rainwater garden (2) and a recycling unit (3); the rotational flow sand setting type rainwater well (1) comprises a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water delivery channel (1-3) and an overflow pipe (1-4); the rainwater garden (2) is sequentially provided with a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) from top to bottom; a plurality of layers of immobilized small balls (2-5) of compound flora are distributed in the medium layer (2-2); the recycling unit (3) comprises an underground water collecting tank (3-1) and a recycling pump (3-3); the rotational flow sand setting type rainwater well (1) is arranged below the permeable pavement, the rainwater garden (2) is arranged on the inner side of the greening area, and the recycling unit (3) is arranged behind the yard; the rotational flow sand setting type rainwater well (1) conveys rainwater to a rainwater garden (2) through a sponge concrete water conveying channel (1-3) and an overflow pipe (1-4), and the rainwater garden (2) is connected with a recycling unit (3) through a connecting pipeline (2-8); the collected rainwater can be recycled after being treated by the cyclone sand setting 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 collecting tank (3-1) to a storage yard water using point (3-4), a road surface water using point (3-5), a green belt water using point (3-6) and a living area water using point (3-6) through a recycling pump (3-3).

The rainwater well body (1-1) is cylindrical, a simple ladder (1-5) is arranged on the inner wall of the rainwater well body, the water inlet pipe (1-2) is tangent to the rainwater well body (1-1), the sponge concrete water delivery channel (1-3) is radially arranged on one side of the rainwater well body (1-1) and is parallel to the water inlet pipe (1-2), the height of the sponge concrete water delivery channel is lower than that of the water inlet pipe (1-1), and a filter screen (1-6) is arranged at an outlet of the sponge concrete water delivery channel; the overflow pipe (1-4) is arranged on the side surface of the rainwater well body (1-1) along the radial direction, is axially vertical to the water inlet pipe (1-2), and is lower than the sponge concrete water delivery canal (1-3). When raining, a large amount of rainwater flows into the water inlet pipe (1-2) through the surface flow and then spirally descends along the inner wall of the rainwater well body (1-1). In the descending process, larger particle pollutants are gathered at the center of the rotational flow water column to sink quickly under the rotational flow effect, rainwater moves from bottom to top, and in the ascending process of the rainwater, the smaller particle pollutants remained in the rainwater can be deposited to the bottom of the rainwater well body (1-1) under the action of the gravity of the rainwater. The water flow at the bottom of the rainwater well body (1-1) is stable, settled silt is not easy to stir up, the rainwater entering the overflow pipe (1-4) has less particle pollutants, and the pipeline deposit is reduced. When the water surface of the water body in the overflow well reaches the outlet of the sponge concrete water delivery channel (1-3), the filter screen (1-6) arranged at the opening of the sponge concrete water delivery channel (1-3) can effectively intercept floating objects, such as leaves and the like, in the water body. When the rainwater well is overhauled and desilted, workers can go down to the well along the simple steps (1-5) to carry out work.

The sponge concrete water delivery channels (1-3) are built by sponge concrete, and the preparation raw materials of the sponge concrete comprise aggregate, cement, a binder, a foaming agent, an anti-cracking agent, a microbial agent and water; the porosity of the sponge concrete is more than 40%, the water permeability coefficient is more than 2mm/s, and the maximum water retention rate is more than 50%. When raining, the sponge concrete water delivery channel (1-3) can collect rainwater permeating into the ground from a permeable road surface and can also convey excessive rainwater in the rotational flow sand setting rainwater well (1), meanwhile, the rainwater is subjected to secondary filtration and pollutant adsorption, a part of rainwater flows to the rainwater garden (2) through the sponge concrete water delivery channel (1-3), and a part of rainwater permeates the sponge concrete water delivery channel (1-3) to supplement underground water.

Drought-tolerant and waterlogging-resistant plants (2-6) are planted on the planting layer (2-1), and the drought-tolerant and waterlogging-resistant plants (2-6) are a combination of iris and reed.

The thickness of planting layer (2-1) is 400mm, it has earth to plant layer (2-1) on, earth thickness is 100mm, the thickness of dielectric layer (2-2) is 500mm, the thickness of drainage blanket (2-3) is 400mm, from last to arranging the rubble of particle diameter crescent down in proper order, the bottom is equipped with collector pipe (2-4), the pipe diameter of collector pipe (2-4) is DN 150.

The composite flora multilayer immobilized pellet (2-5) consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (4-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (4-2).

The medium layer (2-2) is internally provided with a filler, the filler is formed by mixing a biological retention medium, zeolite and straws, and the mass ratio of the biological retention medium to the small ceramsite to the straws is 18: 1: 1.

example 2

One difference between example 2 and example 1 is that: the drought-enduring and waterlogging-resistant plant is a combination of four kinds of iris, canna, reed and calamus.

The wharf rainwater collecting, purifying and recycling system comprises a rotational flow sand settling rainwater well, a rainwater garden and a recycling unit; the rotational flow sand setting type rainwater well comprises a rainwater well body, a water inlet pipe, a sponge concrete water delivery channel and an overflow pipe; the rainwater garden is sequentially provided with a planting layer, a medium layer and a drainage layer from top to bottom; a plurality of layers of immobilized small balls of compound flora are distributed in the medium layer; the recycling unit comprises an underground water collecting tank and a recycling pump; the rotational flow sand settling type rainwater well is arranged below the permeable pavement, the rainwater garden is arranged on the inner side of the greening area, the recycling unit is arranged behind the yard, the rotational flow sand settling type rainwater well conveys rainwater to the rainwater garden through the sponge concrete water conveying channel and the overflow pipe, and the rainwater garden is connected with the recycling unit through the connecting pipeline; the collected rainwater can be recycled after being treated by the cyclone sand setting catch basin and the rainwater garden. The recycling unit recycles the rainwater purified and treated by the rainwater garden in the underground water collecting tank to a storage yard water consumption point, a road surface water consumption point, a green belt water consumption point and a living area water consumption point through a recycling pump.

The rainwater well body is cylindrical, a simple ladder is arranged on the inner wall of the rainwater well body, the water inlet pipe is tangent to the rainwater well body, the sponge concrete water delivery channel is arranged on one side of the rainwater well body along the radial direction, is parallel to the water inlet pipe and is lower than the water inlet pipe in height, and a filter screen is arranged at the outlet of the sponge concrete water delivery channel; the overflow pipe is radially arranged on the side surface of the well body of the rainwater well, the axial direction of the overflow pipe is vertical to the water inlet pipe, and the height of the overflow pipe is lower than that of the sponge concrete water delivery channel.

The sponge concrete water delivery channel is built by sponge concrete, and the preparation raw materials and the weight fraction of the sponge concrete comprise 100-150 g mass parts of aggregate, 10-20 g mass parts of cement, 3-8 g mass parts of binder, 0.5-2 g mass parts of foaming agent, 0.2-1 g mass part of anti-cracking agent and 2-20 g mass parts of water; the aggregate is mainly zeolite, limestone, vermiculite, furnace slag, quartz stone or gravel; the cement is one or more of magnesite material and silico-calcic material cement; the binder is one or more of epoxy resin adhesive, unsaturated polyester resin adhesive, styrene-butadiene rubber, acrylic resin adhesive and polyurethane adhesive; the foaming agent is mainly a physical foaming agent comprising a compound foaming agent and a biosurfactant or a chemical foaming agent comprising 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 mainly comprise aggregate screening and grading, primary mixing and stirring, secondary mixing, aeration and stirring, tertiary mixing and stirring, casting molding and curing; the recycling step of the sponge concrete mainly comprises mechanical crushing, ultrasonic stripping, aggregate sorting and regeneration, and excess material crushing and regeneration; the porosity of the sponge concrete is more than 40%, wherein the volume of the pores with the diameter of 0.4-2 mm accounts for more than 60%, the water permeability coefficient is more than 2mm/s, and the maximum water retention rate is more than 50%.

The thickness of planting the layer is 300-400 mm, it has earth to plant the layer on, earth thickness is 100mm, the thickness of dielectric layer is 400-500 mm, the thickness of drainage blanket is 300-400 mm, arranges the rubble of particle diameter crescent to following in proper order down from last, and the bottom is equipped with the collector pipe, the pipe diameter of collector pipe is DN 100-DN 150.

The immobilized multilayer composite flora material mainly comprises anaerobic ammonia oxidation granular sludge, denitrification granular sludge, aerobic nitrification granular sludge and an embedding agent; the anaerobic ammonium oxidation granular sludge is taken as a kernel, and the grain diameter is 3-8 mm; the denitrification granular sludge and the aerobic nitrification granular sludge are outer-layer embedded objects, and the denitrification granular sludge: the mass ratio of the aerobic nitrification granular sludge is 1: 1; the embedding agent is prepared from polyvinyl alcohol, sodium alginate and water according to the weight ratio of 8: 1: 100 mass ratio.

The medium layer is internally provided with a filler, the filler is formed by mixing a biological retention medium, zeolite and straws, and the mass ratio of the biological retention medium to the small ceramsite to the straws is 18: 1: 1, the bioretention medium comprises soil, river sand and pine bark, and the straw is corn or rice straw.

Claims

1. The utility model provides a collection of pier rainwater is held and is purified and recycling system which characterized in that: the system consists of a rotational flow sand setting type catch basin (1), a rainwater garden (2) and a recycling unit (3); the rotational flow sand setting type rainwater well (1) consists of a rainwater well body (1-1), a water inlet pipe (1-2), a sponge concrete water delivery channel (1-3) and an overflow pipe (1-4); the sponge concrete water delivery channels (1-3) are built by adopting sponge concrete; the rainwater garden (2) is sequentially composed of a planting layer (2-1), a medium layer (2-2) and a drainage layer (2-3) from top to bottom; multilayer immobilized pellets (2-5) of the compound flora are uniformly distributed in the dielectric layer (2-2); the recycling unit (3) consists of an underground water collecting tank (3-1) and a recycling pump (3-3).

2. The wharf rainwater collection, storage, purification and recycling system according to claim 1, wherein: the rainwater well body (1-1) is cylindrical, and a simple ladder (1-5) is arranged on the inner wall of the rainwater well body; the water inlet pipe (1-2) is tangent to the rainwater well body (1-1); the sponge concrete water delivery channel (1-3) is arranged on one side of the rainwater well body (1-1) along the radial direction, is parallel to the water inlet pipe (1-2), is lower than the water inlet pipe (1-1) in installation height, and is provided with a filter screen (1-6) at the outlet; the overflow pipe (1-4) is radially arranged on the side edge of the rainwater well body (1-1) and is axially vertical to the water inlet pipe (1-2); the height of the overflow pipe (1-4) is lower than that of the sponge concrete water delivery canal (1-3).

3. The wharf rainwater collection, storage, purification and recycling system according to claim 1, wherein: the preparation raw materials of the sponge concrete comprise aggregate, cement, a binder, a foaming agent, an anti-cracking agent, a microbial agent and water; the porosity of the sponge concrete is more than 40%, the water permeability coefficient is more than 2mm/s, and the maximum water retention rate is more than 50%.

4. The wharf rainwater collection, storage, purification and recycling system according to claim 1, wherein: drought-tolerant and waterlogging-resistant plants (2-6) are planted on the planting layer (2-1); the drought-enduring and waterlogging-resistant plant (2-6) is one or more of iris, canna, reed and calamus; the thickness of the planting layer (2-1) is 300-400 mm; the composite flora multilayer immobilized pellet (2-5) consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (4-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (4-2); the thickness of the dielectric layer (2-2) is 400-500 mm, and filling materials are filled in the dielectric layer; the filler is prepared from a biological retention medium, zeolite or ceramsite and straw according to a mass ratio of 10-20: 0.5-2: 1, mixing; the bioretention media includes soil, river sand and pine bark; the thickness of the drainage layer (2-3) is 300-400 mm, broken stones with gradually increased particle sizes are sequentially arranged from top to bottom, and a water collecting pipe (2-4) is arranged at the bottom; the pipe diameter of the water collecting pipe (2-4) is DN 100-DN 150.

5. The wharf rainwater collection, storage, purification and recycling system according to claim 1, wherein: the underground water collecting tank (3-1) collects rainwater purified and treated by a rainwater garden and is connected with a recycling pump (3-3) through a recycling pipeline (3-2); the recycling pump (3-3) conveys the purified rainwater in the water collecting tank (3-1) to a storage yard water consumption point (3-4), a road surface water consumption point (3-5), a green belt water consumption point (3-6) and a living area water consumption point (3-7).