CN113582444B

CN113582444B - Collecting, purifying and recycling process for runoff pollution of dry bulk cargo wharf

Info

Publication number: CN113582444B
Application number: CN202110839914.7A
Authority: CN
Inventors: 陈宏�; 阳滔; 邓斌; 王�泓; 余关龙; 邓征宇; 禹丽娥; 杜春艳; 曾嘉; 谢莱
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: 2022-12-02
Anticipated expiration: 2041-07-22
Also published as: CN113582444A

Abstract

The invention discloses a process for collecting, purifying and recycling runoff pollution of a dry bulk cargo wharf. The process consists of a seepage collecting unit, a high-density sedimentation tank, a partition biological retention unit and a recycling unit. Runoff pollution is collected by an overflow rainwater well cover and a water collecting channel of the seepage collecting unit, the seepage part is collected by a water collecting pipe through a renewable sponge concrete layer and conveyed to the zoning bioretention unit, and the non-seepage part is conveyed to a high-density sedimentation tank through the water collecting channel; then the mixture is precipitated in a precipitation zone after the reaction of a coagulation zone and an added coagulant as well as a flocculation zone and an added coagulant aid in the high-density sedimentation tank; then, the sewage flows from a water inlet pipe of the subarea biological detention unit through the first detention area, automatically flows into the second detention area and is collected in a water collecting well; and finally entering the recycling unit. The invention is suitable for various small-sized dry and bulk cargo wharfs, aims at the water quality characteristics of runoff pollution of the dry and bulk cargo wharfs, and has the advantages of simple and compact structure, low operation cost, environmental friendliness and the like.

Description

Collecting, purifying and recycling process for runoff pollution of dry bulk cargo wharf

The technical field is as follows:

the invention relates to a collecting, purifying and recycling process for runoff pollution of a dry bulk cargo wharf, and belongs to the field of rainwater drainage engineering.

Background art:

in the early stage of rainfall, a large amount of polluted gases in the air, such as acid gas, automobile exhaust, factory waste gas and the like, are dissolved in rainwater, and after the rainwater falls to the ground, the runoff pollution degree is higher due to scouring of roofs, concrete roads and the like, and such polluted water bodies are collectively called runoff pollution. The dry bulk cargo wharf has loading and unloading operations of materials such as coal, ore and the like, dust is easy to float on the wharf surface, and the dust returns to the ground again through rainfall to form sewage; the sewage is generally called polluted runoff and generally comprises initial rainwater, flushing water, dust removing water and other sewage, but the types of the pollutants contained in the sewage are complex and cannot be effectively treated, so that the environment is polluted greatly; the content of suspended substances in runoff pollution is as high as 1000-3000 mg/L, and obvious pollution is caused to the environment.

The collection of the dry bulk cargo wharf for the radial flow pollution generally adopts a mode of transversely arranging a drainage ditch on the wharf, namely arranging the drainage ditch in a direction parallel to a cross beam of the wharf, and draining water from two sides of the wharf to a middle drainage ditch. The method has low collection and utilization rate of the wharf surface runoff pollution, and most of rainwater cannot effectively flow into the drainage ditch, so that the runoff pollution directly flows into the natural water body, the pollution to the natural water body is caused, and a large amount of rainwater resources are wasted.

With the continuous improvement of the national environmental protection requirement, the sewage collection and discharge of a plurality of ports and wharfs constructed according to old specifications and old requirements are difficult to reach the existing sewage discharge standard. There are mainly the following problems: (1) the sewage treatment facilities have the conditions of technical lag, long-term maintenance and the like; (2) the wharf with earlier production time does not have a sewage collecting and treating device; (3) the collection and reuse process of the polluted runoff on the wharf is laggard, and the national standard cost is high; (4) a coordination and connection mechanism of pollutant transfer and environmental sanitation departments in a harbor area is not effectively established, and the docking difficulty of a harbor area sewage pipeline and a municipal sewage pipe network is large.

Therefore, how to realize the treatment and the reuse of the runoff pollution of the bulk cargo wharf is a key problem to be solved. The invention combines the design concept of 'artificial wetland', inherits the principles of green, ecology and environmental protection, and designs and develops the dry bulk cargo wharf runoff pollution collecting and recycling process aiming at the water quality characteristics of dry bulk cargo wharf runoff pollution.

The invention content is as follows:

the problems to be solved by the invention are as follows: the invention provides a collecting, purifying and recycling process for runoff pollution of a dry bulk cargo wharf, which has the advantages of simple and compact structure, low operation cost, environmental protection, easy control and high recycling rate, and aims to solve the problems of insufficient treatment capacity on the surface source pollution of an old constructed wharf, high concentration of suspended matters in sewage, serious pollution to water, low utilization rate, various pollutants and the like.

In order to solve the technical problems, the solution proposed by the invention is as follows: a collection, purification and recycling process for runoff pollution of a dry bulk cargo wharf comprises a seepage collection unit (1), a high-density sedimentation tank (2), a partition biological retention unit (3) and a recycling unit (4); the seepage collecting unit (1) consists of an overflow rainwater well cover (1-1), a water catchment channel (1-2), a renewable sponge concrete layer (1-2-1), a water collecting pipe (1-3) and an anti-seepage geomembrane (1-5); the basic process of the process comprises the following steps: (1) runoff pollution is collected by an overflow rainwater well cover (1-1) and a water collecting channel (1-2) of the seepage collecting unit (1), the seepage part is collected by a water collecting pipe (1-3) through a renewable sponge concrete layer (1-2-1) and conveyed to a subarea biological retention unit (3), and the non-seepage part is conveyed to a high-density sedimentation tank (2) through the water collecting channel (1-2); (2) then the wastewater is reacted with an added coagulant (2-5) and a flocculation area (2-2) in the high-density sedimentation tank (2) and an added coagulant aid (2-7) and then is precipitated in a sedimentation area (2-3); (3) then, the water flows from a water inlet pipe (3-1-7) of the partitioned biological retention unit (3) to a first retention area (3-1), enters a second retention area (3-2) by self-flow and is collected in a water collecting well (3-3); (4) finally, the water enters the recycling unit (4) and is conveyed to a yard water consumption point, a road water consumption point and a green belt water consumption point.

In the collecting, purifying and recycling process for the runoff pollution of the dry bulk cargo wharf, the top of the catchment channel (1-2) is provided with an overflow rainwater well cover (1-1), and the bottom of the channel is a renewable sponge concrete layer (1-2-1); a water collecting pipe (1-3) is arranged below the renewable sponge concrete layer (1-2-1); the water collecting pipe (1-3) is connected with the subarea bioretention unit (3); the tail end of the water collecting channel (1-2) is connected into a high-density sedimentation tank (2); the renewable sponge concrete layer (1-2-1) is made of renewable sponge concrete.

In the collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf, the partitioned biological retention unit (3) consists of an assembled flower bed (5), a first retention area (3-1), a second retention area (3-2) and a water collection well (3-3); arranging a first isolation plate (6) and a second isolation plate (7) in a pool of the assembled flower bed (4); the first residence zone (3-1): the second retention zone (3-2): the length ratio of the water collecting wells (3-3) is 2-4: 3-5.5: 0.5-1.

In the collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf, the first detention zone (3-1) sequentially consists of a water storage layer I (3-1-1), a planting layer I (3-1-2), a biological medium layer (3-1-3), a fine sand layer I (3-1-4), a fine gravel layer I (3-1-5), a coarse gravel layer I (3-1-6) and a water inlet pipe (3-1-7) from top to bottom; (ii) a A first functional plant (3-1-8) is planted in the planting layer (3-1-6); the functional plant I (3-1-8) is one or more of canna, yellow iris and lilac flower; the biological medium layer (3-1-3) is formed by filling soil, river sand, pine bark, small ceramic granules and straws; the second detention zone (3-2) is composed of a second water storage layer (3-2-1), a second planting layer (3-2-2), a second fine sand layer (3-2-3), a volcanic rock medium layer (3-2-4), a second fine gravel layer (3-2-5) and a second coarse gravel layer (3-2-6) from top to bottom in sequence; a second functional plant (3-2-7) is planted in the second planting layer (3-2-2); the second functional plant (3-2-7) is one or more of typha angustifolia, miscanthus sinensis or calamus flavus; a plurality of layers of immobilized materials (8) of the complex flora are uniformly filled in the second planting layer (3-2-2); the composite flora multilayer immobilized material (8) consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (8-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (8-2); the volcanic rock layer (3-2-4) is composed of volcanic rock with phi of 5-10 mm; and an 8-mesh filter screen (3-3-1) with the height of 150mm is arranged on the right side of the coarse gravel layer I (3-1-6).

In the collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf, the high-density sedimentation tank (2) consists of a mixing area (2-1), a flocculation area (2-2) and a sedimentation area (2-3); the front end of the high-density sedimentation tank (2) is connected with the seepage collecting unit (1), and the rear end is connected with the subarea biological retention unit (3); the coagulant (2-5) is mainly polyaluminium chloride, and the adding amount is 10-20 mg/L; the coagulant aid (2-7) is polyacrylamide, and the dosage of the coagulant aid is 2-4 mg/L.

In the collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf, the preparation raw materials and the weight fractions of the renewable sponge concrete comprise 100-150 g of aggregate, 10-20 g of cement, 3-8 g of binder, 0.5-2 g of foaming agent, 0.2-1 g of anti-cracking agent and 2-20 g of water; the aggregate is mainly zeolite, limestone, vermiculite, furnace slag, quartz stone or gravel; one or more of the cement magnesite material and the 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 renewable sponge concrete layer 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 steps of the renewable sponge concrete mainly comprise mechanical crushing, ultrasonic stripping, aggregate sorting and regeneration, and excess material crushing and regeneration; the porosity of the renewable sponge concrete is more than 40%, wherein the volume of 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%.

In the collecting, purifying and recycling process for the runoff pollution of the dry bulk cargo wharf, in order to ensure the rapid treatment of the runoff pollution of the wharf, branch channels and main channels formed by the catchment channels (1-2) can be reasonably arranged, and meanwhile, the catchment channels (1-2) need to be regularly cleaned and cleaned.

In order to improve the uniformity of the water permeation process, a plurality of water inlet pipes (3-1-7) can be arranged, and branch pipes can be additionally arranged; in addition, in order to improve the adaptability of the device, the shape of the device can be changed and can be rectangular, elliptical or circular arc.

To the great operating mode of flow, can form a plurality of devices parallel operation by the water main pipe to every device water distribution by a plurality of devices, sewage treatment system includes a plurality of biological filtration detention pond, the entering pipe subassembly includes the inlet tube of trunk line and many parallel connection access trunk lines, and every inlet tube corresponds the bottom in a biological filtration detention pond, the outlet pipe subassembly includes the collection outlet pipe of main return water pipeline and many parallel connection access trunk lines, and every collection outlet pipe corresponds and inserts a biological filtration detention pond.

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

(1) the invention aims to improve the purification efficiency of the artificial wetland, solve the problems of short retention time and limited purification rate of the traditional artificial wetland root system layer and improve the treatment efficiency of the traditional vertical flow artificial wetland.

(2) According to the invention, inorganic pollutants such as suspended solid particles, heavy metals and the like, and organic pollution removal such as ammonia nitrogen and chemical oxygen demand are separately removed, so that the toxicity of the inorganic pollutants on various functional microorganisms such as nitrobacteria, methanogens and the like is reduced, the plant density is high, the number of plant roots and microorganisms in the filler layer is rich, and the purification efficiency is improved.

(3) The sponge concrete used in the invention has high permeability and is renewable, and can be directly filtered and discharged to the partitioned bioretention unit from the sponge concrete ditch aiming at daily light rain and cleaning water, thereby greatly saving the usage amount of chemical agents in the high-density sedimentation tank.

(4) According to the invention, the composite flora multilayer immobilized material is uniformly filled in the upper layer of the soil of the rainwater garden planting layer, so that the co-immobilization culture of the anaerobic ammonia oxidation granular sludge and the aerobic nitrification granular sludge in an embedding carrier is realized, the biological efficiency of the two kinds of granular sludge is coordinately exerted, and the coordinated operation of the aerobic nitrification reaction and the anaerobic ammonia oxidation reaction is realized; the method for preparing the multilayer immobilized material of the composite flora is simple and convenient, the manufacturing 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 utilizes the characteristics of high biological concentration and strong environmental adaptability of the immobilized microorganism technology, and has the advantages of low cost, high efficiency, ecology and the like.

(5) The rainwater treatment device is simple in structure, modularized, small in occupied area, capable of adding different modules for combined arrangement according to the flow, capable of running in parallel, capable of shortening the process steps of rainwater recycling, capable of reducing the cost of subsequent rainwater treatment, good in treatment effect and capable of guaranteeing the quality of outlet water.

Drawings

FIG. 1 is a schematic view of a process flow of collecting, purifying and recycling runoff pollution of a dry bulk cargo wharf.

Fig. 2 is a schematic structural view of a seepage water drainage unit.

FIG. 3 is a schematic diagram of a high-density sedimentation tank.

FIG. 4 is a schematic view of a partitioned bioretention unit structure.

FIG. 5 is a schematic view of a composite bacterial flora multilayer immobilization material.

Illustration of the drawings:

the specific implementation mode is as follows:

all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The seepage collecting unit (1) is arranged on a storage yard and a transportation road and consists of an overflow rainwater well cover (1-1), a water collecting channel (1-2), a renewable sponge concrete layer (1-2-1), a water collecting pipe (1-3) and an impermeable geomembrane (1-5); the top of the catchment channel (1-2) adopts an overflow rainwater well cover (1-1), the bottom of the channel is a renewable sponge concrete layer (1-2-1), and a water collecting pipe (1-3) is arranged below the bottom of the channel; constructing a catchment channel (1-2) with the width of 30 multiplied by 50cm, effectively collecting polluted runoff in the range of 20-35m at the left side and the right side of the catchment channel (1-2) to rapidly infiltrate downwards, directly entering the water collecting pipe (1-3) at the lower layer, and then conveying the polluted runoff to the zoning bioretention unit (3) through the water collecting pipe (1-3); aiming at rainfall larger than 100mm, excessive pollution runoff which does not reach the water collecting pipe (1-3) in time is discharged to the high-density sedimentation tank (2), and the renewable sponge concrete layer (1-2-1) is made of renewable sponge concrete.

The high-density sedimentation tank (2) consists of a mixing zone (2-1), a flocculation zone (2-2) and a sedimentation zone (2-3); the front end is connected with the infiltration collecting unit (1), and the rear end is connected with the subarea biological retention unit (3); coagulant (2-5) polyaluminium chloride is added into the coagulation zone (2-1) at the first, the adding amount is 10-20 mg/L, coagulant aid (2-7) polyacrylamide is added into the flocculation zone (2-2), and the adding amount is 2-4 mg/L.

Entering the subarea biological retention unit (3) and conveying the subarea biological retention unit to a first retention area (3-1), wherein the first retention area (3-1) consists of a water storage layer I (3-1-1), a planting layer I (3-1-2), a biological medium layer (3-1-3), a fine sand layer I (3-1-4), a fine gravel layer I (3-1-5), a coarse gravel layer I (3-1-6) and a water inlet pipe (3-1-7), and the pipe diameter of the water inlet pipe is DN 100-DN 150; in the first detention zone (3-1), rainwater passes through three layers of a fine sand layer I (3-1-4), a fine gravel layer I (3-1-5) and a coarse gravel layer I (3-1-6) to filter suspended solid particles, and the filtering is called physical filtering; further rainwater enters a biological medium layer (3-1-3), the thickness of the biological medium layer (3-1-3) is 500mm, biological retention media in the filler comprise soil, river sand and pine bark, small ceramic granules and corn straws are used as modifiers, the small ceramic granules are easy to form a film, pollutants in water can be adsorbed, the water permeability and water retention property of the corn straws are good, and the biological medium layer is natural, environment-friendly, water-saving and fertilizer-saving; at the moment, heavy metal pollutants in the water are adsorbed by the first functional plants (3-1-8) of the first biological medium layer (3-1-3) and the first planting layer (3-1-2), so that the content of the heavy metal pollutants is greatly removed, and finally, rainwater is collected in the first water storage layer (3-1-1).

When the water level of the first water storage layer (3-1-1) exceeds the top point of the partition plate (6), the water of the first water storage layer (3-1-1) falls to the second detention area (3-2), the second detention area (3-2) is composed of various fillers, and the second water storage layer (3-2-1), the second planting layer (3-2-2), the second fine sand layer (3-2-3), the volcanic rock medium layer (3-2-4), the second fine gravel layer (3-2-5) and the second coarse gravel layer (3-2-6) are sequentially arranged from top to bottom; the thickness of the second water storage layer (3-2-1) is 300-400 mm; soil is arranged on the second planting layer (3-2-2) and is 100mm thick, typha, miscanthus sinensis or calamus (3-2-6) are planted on the second planting layer (2-2), and a composite flora multilayer immobilized material (8) is uniformly filled on the upper layer of the soil and cooperates with the roots of the plants to construct an enhanced denitrification system; the composite flora multilayer immobilized material consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (8-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (8-2); the first fine sand layer (3-1-4) is fine sand with the thickness of 100mm and the diameter of 0.25-0.35 mm; the volcanic rock layer (3-2-4) is filled with volcanic rock phi 5-10 mm with the thickness of 200 mm; filling 150mm thick crushed stone of phi 3-8 mm into the fine gravel layer I (3-1-5); filling 150mm thick crushed stone of phi 15-30 mm in the coarse gravel layer I (3-1-6); an 8-mesh filter screen (3-3-1) with the height of 150mm is arranged at the right side of the coarse gravel layer I (3-1-6); a first detention area and a second detention area on a collecting, purifying and recycling system of coal-containing sewage of a bulk wharf have a height difference of 200-300 mm, water flow can form self-flow, so that dissolved oxygen reaches 2-3 mg/L, a volcanic rock medium layer (3-2-4) is an anoxic/anaerobic environment, the dissolved oxygen is 0.2-0.5 mg/L, and aerobic and anaerobic treatment is carried out on pollutants for multiple times so as to effectively remove ammonia nitrogen and chemical oxygen demand.

The treated runoff pollution is collected in a water collecting well (3-3), the water collecting well (3-3) is arranged on the right side of the second detention area (3-2), the lowest point of a water outlet pipe (3-3-2) of the water collecting well (3-3), with the pipe diameter of DN 100-DN 150, is arranged 200mm lower than the top point of the overflow plate (6), and finally the runoff pollution passes through the water outlet pipe (3-3-2) and is collected in a recycling unit (4); the recycling unit (4) is composed of a clean water tank, and water in the clean water tank is recycled to the storage yard water consumption point, the road water consumption point, the green belt water consumption point and the living area water consumption point.

The raw materials for preparing the renewable sponge concrete of the renewable sponge concrete layer (1-2-1) and the weight fractions thereof comprise 100-150 g of aggregate, 10-20 g of cement, 3-8 g of binder, 0.5-2 g of foaming agent, 0.2-1 g of anti-cracking agent and 2-20 g of water; the aggregate is mainly zeolite, limestone, vermiculite, furnace slag, quartz stone or gravel; one or more of the cement magnesite material and the silico-calcia 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 renewable sponge concrete layer 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 steps of the renewable sponge concrete mainly comprise mechanical crushing, ultrasonic stripping, aggregate sorting and regeneration, and excess material crushing and regeneration; the porosity of the renewable sponge concrete is more than 40%, wherein the volume of 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%.

Claims

1. A collection, purification and recycling process for runoff pollution of a dry bulk cargo wharf is characterized by comprising a seepage collection unit (1), a high-density sedimentation tank (2), a partition biological retention unit (3) and a recycling unit (4); the seepage collecting unit (1) consists of an overflow rainwater well cover (1-1), a water catchment channel (1-2), a renewable sponge concrete layer (1-2-1), a water collecting pipe (1-3) and an anti-seepage geomembrane (1-5); the process comprises the following steps: (1) runoff pollution is firstly collected by an overflow rainwater well cover (1-1) and a water collecting channel (1-2) of the seepage collecting unit (1), the seepage part is collected by a water collecting pipe (1-3) through a renewable sponge concrete layer (1-2-1) and conveyed to a subarea biological retention unit (3), and the non-seepage part is conveyed to a high-density sedimentation tank (2) through the water collecting channel (1-2); (2) then the wastewater is precipitated in a precipitation zone (2-3) through a coagulation zone (2-1) and a flocculation zone (2-2) in the high-density sedimentation tank (2); (3) then, the water flows from a water inlet pipe (3-1-7) of the partitioned biological retention unit (3) to a first retention area (3-1), enters a second retention area (3-2) by self-flow and is collected in a water collecting well (3-3); (4) finally, the water enters the recycling unit (4), namely is conveyed to a storage yard water consumption point, a road water consumption point and a green belt water consumption point; the partitioned biological retention unit (3) consists of an assembled flower bed (5), a first retention area (3-1), a second retention area (3-2) and a water collection well (3-3); the second detention zone (3-2) consists of a second water storage layer (3-2-1), a second planting layer (3-2-2), a second fine sand layer (3-2-3), a volcanic rock medium layer (3-2-4), a second fine gravel layer (3-2-5) and a second coarse gravel layer (3-2-6) in sequence from top to bottom; a plurality of layers of immobilized materials (8) of the complex flora are uniformly filled in the second planting layer (3-2-2); the renewable sponge concrete layer (1-2-1) is made of renewable sponge concrete; the porosity of the renewable sponge concrete is more than 40%, wherein the volume of 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%.

2. The collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf according to claim 1, wherein an overflow rainwater well cover (1-1) is arranged at the top of the water collection channel (1-2), and a renewable sponge concrete layer (1-2-1) is arranged at the bottom of the channel; a water collecting pipe (1-3) is arranged below the renewable sponge concrete layer (1-2-1); the water collecting pipe (1-3) is connected with the subarea bioretention unit (3); the tail end of the water collecting channel (1-2) is connected into a high-density sedimentation tank (2); the renewable sponge concrete layer (1-2-1) is made of renewable sponge concrete.

3. The collecting, purifying and recycling process of the runoff pollution of the dry bulk cargo wharf according to claim 1, wherein a first partition plate (6) and a second partition plate (7) are arranged in a pool of the assembled flower bed (5); the first residence zone (3-1): the second residence zone (3-2): the length ratio of the water collecting well (3-3) is 2:3:1.

4. the process for collecting, purifying and recycling runoff pollution of the dry bulk cargo wharf according to claim 1, wherein the process comprises the following steps: the first detention zone (3-1) sequentially consists of a first water storage layer (3-1-1), a first planting layer (3-1-2), a biological medium layer (3-1-3), a first fine sand layer (3-1-4), a first fine gravel layer (3-1-5), a first coarse gravel layer (3-1-6) and a water inlet pipe (3-1-7) from top to bottom; a first functional plant (3-1-8) is planted in the planting layer (3-1-6); the functional plant I (3-1-8) is one or more of canna, yellow iris and lilac flower; the biological medium layer (3-1-3) is formed by filling soil, river sand, pine bark, small ceramic granules and straws; a second functional plant (3-2-7) is planted in the second planting layer (3-2-2); the second functional plant (3-2-7) is one or more of typha orientalis, miscanthus sinensis or acorus calamus; the composite flora multilayer immobilized material (8) consists of an inner core and an outer layer embedded substance, wherein the inner core is prepared from anaerobic ammonia oxidation granular sludge (8-1), and the outer layer embedded substance is prepared from aerobic nitrification granular sludge (8-2); the volcanic rock layer (3-2-4) is composed of volcanic rock with phi of 5-10 mm; and an 8-mesh filter screen (3-3-1) with the height of 150mm is arranged on the right side of the coarse gravel layer I (3-1-6).

5. The process of claim 1 or 2, wherein the process comprises the steps of: the raw materials for preparing the renewable sponge concrete and the weight fractions thereof comprise 100-150 g of aggregate, 10-20 g of cement, 3-8 g of binder, 0.5-2 g of foaming agent, 0.2-1 g of anti-cracking agent and 2-20 g of water; the aggregate is mainly zeolite, limestone, vermiculite, furnace slag, quartz stone or gravel; the cement is one or more of a magnesite material and a silico-calcium material; 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 renewable sponge concrete layer 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 steps of the renewable sponge concrete mainly comprise mechanical crushing, ultrasonic stripping, aggregate sorting and regeneration, and remainder crushing and regeneration.