CN112374686B - Surface runoff collecting, purifying, storing and recycling system for railway storage yard - Google Patents
Surface runoff collecting, purifying, storing and recycling system for railway storage yard Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C02F3/302—Nitrification and denitrification treatment
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Abstract
The invention discloses a system for collecting, purifying, storing and recycling surface runoff of a railway storage yard, which controls surface runoff of the storage yard to form non-point source pollution. The surface runoff of the storage yard sequentially passes through the inflow sewage interception module and enters the ecological water purification ditch and the reuse water multi-unit rainwater garden, and the ecological water purification ditch and the reuse water multi-unit rainwater garden are internally provided with an ecological-biological-electrolytic coupling purification module. The ecological water purification ditch inflow interception module has the functions of intercepting large floating and particle pollutants and filtering and adsorbing ammonia nitrogen to purify surface runoff; the ecological water purification ditch loaded with the ecological-biological-electrolytic coupling purification module and the multi-unit recycled water garden have the functions of water delivery, water purification, storage and reuse, the natural fiber filler is used for enriching microorganisms, the electrolysis system powered by solar energy is arranged for enhancing the removal of nitrogen, phosphorus and organic matters, the effluent reaches the reuse water standard of urban waste water recycling urban miscellaneous water quality (GB/T18920-2002), and the effluent is reused for greening and washing ground water.
Description
Technical Field
The invention belongs to the technical field of sewage treatment and environmental protection, and particularly relates to a system for collecting, purifying, storing and recycling surface runoff of a railway storage yard.
Background
At present, the ecological environment of surface runoff surface source pollution seriously threatens the water catching environment, and the flushing water of a railway storage yard and pollutants in rainwater runoff seriously threaten the water environment nearby the flushing water. The method combines the concept of sponge city, establishes a storage yard surface runoff recycling system integrating collection, purification, storage and reuse, can greatly reduce the pollution to the surrounding receiving water and soil, and has important practical significance.
In recent years, rainwater collection, treatment and utilization systems based on the concept of sponge cities are developed rapidly, for example, CN209412944U, "a grass planting ditch system based on sponge cities", CN209428880U, "a rainwater recycling system for sponge cities", and CN110195463A, "a rainwater treatment system and method for sponge cities for controlling surface source pollution", which are successively disclosed in chinese patent documents. The pipeline system of the system is complex, the structure of the underlying surface needs to be transformed in a large area, the later-stage overhaul and transformation are difficult, and the quartz sand and gravel packing are easy to block, the stored water amount is low, and the recycling is not facilitated.
Disclosure of Invention
The invention provides a system for collecting, purifying, storing and recycling surface runoff of a storage yard, aiming at the problems of the prior runoff pollution control and recycling technology, wherein the system is used for intercepting large floating objects and suspended matters in the surface runoff of the storage yard through an ecological water purification ditch inflow interception module before the surface runoff enters an ecological water purification ditch so as to prevent the surface runoff from entering the ecological water purification ditch to deposit and block the ditch; and laying an anti-seepage HDPE film on the ecological water purification ditch and the multi-unit rainwater garden for reuse water, so that the ecological water purification ditch and the multi-unit rainwater garden for reuse water have the function of storing surface runoff; meanwhile, an ecological-biological-electrolytic coupling purification module is arranged in the ecological water purification ditch; a precipitation unit, a nitrification unit, a denitrification unit (provided with an ecological-biological-electrolytic coupling purification module inside) and a water storage recycling unit are respectively arranged in the reclaimed water multi-unit rainwater garden to strengthen surface runoff which is purified and collected, so that the effluent meets the requirement of reclaimed water quality.
The technical scheme for realizing the purpose of the invention is as follows:
the invention provides a system for collecting, purifying, storing and recycling surface runoff of a railway storage yard, which comprises: the system comprises an ecological water purification ditch inflow sewage interception module arranged around a storage yard, an ecological water purification ditch internally provided with an ecological-biological-electrolytic coupling purification module, and a reuse water multi-unit rainwater garden arranged at the water outlet end of the ecological water purification ditch;
the ecological water purification ditch is arranged at the water outlet end of the ecological water purification ditch inflow sewage interception module.
Preferably, surface runoff in the storage yard passes through an ecological clean water ditch inflow interception module arranged in front of the ecological clean water ditch to intercept floating matters, filter suspended matters and adsorb ammonia nitrogen; then, the effluent enters an ecological water purification ditch, and nitrogen, phosphorus and organic matters are removed through an ecological-biological-electrolytic coupling purification module arranged in the ecological water purification ditch; the purified effluent flows into a multi-unit rainwater garden for reuse to be further purified, stored and reused;
the recycled water multi-unit rainwater garden consists of a multi-stage purification unit, a filtering unit and a water storage unit, wherein the multi-stage purification unit comprises a precipitation unit, a nitrification unit and a denitrification unit which are sequentially arranged, a gravel matrix layer and plants are arranged in the nitrification unit, and an ecological-biological-electrolytic coupling purification module is arranged in the denitrification unit; the runoff purified by the multi-stage purification unit enters a filtering unit, a quartz sand filtering layer is arranged in the filtering unit, and plants are planted on the upper part of the quartz sand filtering layer; the effluent of the filtering unit enters a water storage unit planted with emergent aquatic plants, and is pumped for recycling through a submersible sewage pump arranged in the water storage unit.
Preferably, ecological clear water ditch inflow interception module includes: the detachable floater interception filter screen, the zeolite filler filter layer, the plants and the module frame;
the module frame is arranged at the water inlet edge of the ecological water purification ditch, the bottom of the module frame is 10cm lower than the ground surface of a storage yard, the floater intercepting filter screens are arranged at the water inlet side and the water outlet side of the module frame, the zeolite filler filter layers are filled in the module frame, and plants are planted on the surface layer of the module frame;
the floater intercepting filter screen is a stainless steel filter screen with phi 3 to 5mm;
the zeolite filler filter layer is composed of zeolite filler with the grain diameter of 3 to 8mm, the thickness of the zeolite filler filter layer is 200 to 300mm, and the zeolite filler filter layer is used for adsorbing and removing ammonia nitrogen in runoff of a storage yard and filtering and removing suspended matters;
plants planted on the surface layer in the module frame are used for beautifying the environment.
Preferably, the ecological water purification ditch and the reuse water multi-unit rainwater garden are formed by mechanical excavation and ramming with earth on the basis of natural terrain; and impermeable HDPE films are laid on the inner surfaces of the ecological water purification ditch and the reuse water multi-unit rainwater garden to store surface runoff for reuse after purification.
Preferably, the eco-bio-electrolytically-coupled purification modules are detachably installed in the denitrification units of the ecological clean water trench and the reuse water multi-unit rainwater garden, and the number of the eco-bio-electrolytically-coupled purification modules and the module thickness are determined by the size and depth of the ecological clean water trench and the reuse water multi-unit rainwater garden.
Preferably, the eco-bio-electrolytic coupled purification module comprises: the solar energy power generation system comprises a suspension type module frame, a natural fiber filler layer, a mesh iron plate anode electrode, a mesh iron plate cathode electrode, solar energy power supply equipment and plants;
the filling density of the natural fiber filler layer in the suspension type module frame is 40-60%; the cross section area of the suspension type module frame is equal to that of the ecological water purification ditch;
the aperture of the mesh iron plate anode electrode and the aperture of the mesh iron plate cathode electrode are 5-10mm, the mesh iron plate anode electrode is externally connected with the anode of the solar power supply equipment through a wire, and the mesh iron plate cathode electrode is externally connected with the cathode of the solar power supply equipment through a wire;
the electrodes are arranged in a single-anode double-cathode mode or a single-anode three-cathode mode, and when the electrodes are arranged in a single-anode double-cathode mode, 1 mesh iron plate cathode electrode is placed at the two ends of the mesh iron plate anode electrode at equal intervals; when the electrodes are arranged in a single-anode three-cathode mode, 3 meshed iron plate cathode electrodes are arranged on one side of the meshed iron plate anode electrode at equal intervals, and the electrifying current in the ecological-biological-electrolytic coupling purification module is connected with solar power supply equipment;
by means of electrolysis, the anode electrode of the net-shaped iron plate loses electrons to generate ferrous ions and ferric ions which are combined with phosphate in runoff, so that the flocculation removal of phosphorus is realized; meanwhile, electrons of the mesh iron plate cathode electrode are used for generating hydrogen to enrich the hydrogen autotrophic denitrifying bacteria, and nitrogen removal is realized without an external carbon source;
the ecological-biological-electrolytic coupling purification module adopts a plant planting mode as follows: the natural fiber filler is used as a supporting carrier for plant cultivation and is placed in a suspension type module frame.
Compared with the prior art, the invention has the following characteristics:
1. integrates surface runoff collection, purification, storage and reuse into a whole, and has high purification efficiency and large storage capacity
On one hand, a zeolite filter material layer is adopted in the inflow sewage interception module of the ecological water purification ditch, so that part of ammonia nitrogen can be removed through adsorption; on the other hand, the ecological water purification ditch and the multi-unit rainwater garden for reuse water are provided with ecological-biological-electrolytic coupling purification modules, and the nitrogen and phosphorus purification efficiency of the system is enhanced through the coupling of biological membranes and electrochemistry. The ecological-biological-electrolytic coupling purification module adopts natural fiber filler, has large specific surface area and good biological affinity, can enrich a large amount of nitrobacteria, denitrifying bacteria and hydrogen autotrophic denitrifying bacteria, and greatly improves the denitrification efficiency of the system; after an electrolysis system is loaded, efficient phosphorus removal is carried out through electrocoagulation; the electrolysis system does not need to supplement a carbon source, and the denitrification effect of the low C/N surface runoff is effectively enhanced.
2. Low investment and running cost
On one hand, the ecological water purification ditch and the multi-unit rainwater garden for reuse are constructed by mechanical excavation, soil compaction and film covering according to topographic conditions, the ecological-biological-electrolytic coupling purification module consists of natural fiber fillers and an iron electrode, and the whole system is low in construction cost; on the other hand, the solar power generation equipment adopted by the invention supplies power to the electrolysis device through the direct current stabilized voltage power supply, fully utilizes green energy solar energy, and has the advantages of low current intensity, short power supply time and low power consumption, and pollutants in surface runoff are mainly biologically-ecologically purified.
3. Convenient operation and maintenance and good landscape effect
On the one hand, dirty module is cut in ecological water purification ditch inflow, and the clearance all can be dismantled to the filter screen of advancing, going out the surface of water, and it is convenient to change. On the other hand, the ecological water purification ditch and the ecological-biological-electrolytic coupling purification module loaded in the multi-unit rainwater garden for reuse adopt a detachable and replaceable modular design and simultaneously adopt solar energy for power supply, so that the maintenance and management are convenient.
In addition, plants can be planted in the ecological water purification ditch inflow pollutant interception module and the ecological-biological-electrolytic coupling purification module, and the ecological landscape effect is good.
In conclusion, the system for collecting, purifying, storing and recycling the surface runoff of the railway storage yard has the advantages of high purification efficiency, large storage capacity, low investment and operation cost, small floor area, convenience in operation and maintenance, good landscape effect and the like.
Drawings
FIG. 1 is a plan view of a yard surface runoff collection, purification, storage, and reclamation system;
FIG. 2 is a flow diagram of a system for collecting, purifying, storing and recycling surface runoff in a storage yard;
FIG. 3 is a plan view of an ecological clean water ditch inflow sewage interception module;
FIG. 4 isbase:Sub>A sectional view of the influent sewage interception module A-A of the ecological water purification ditch of FIG. 3;
FIG. 5 is a sectional view B-B of the ecological clean water ditch inflow sewage interception module shown in FIG. 3;
FIG. 6 is a plan view of the eco-bio-electrolytic coupling purification module;
FIG. 7 is a cross-sectional view of the eco-bio-electrolytic coupled purification module C-C of FIG. 6;
FIG. 8 is a cross-sectional view of the eco-bio-electrolytic coupling purification module D-D.
Detailed Description
The structure and operation of the present invention are further described below with reference to the accompanying drawings.
The embodiment of the invention provides a system for collecting, purifying, storing and recycling surface runoff of a railway storage yard, which comprises a storage yard 1, an ecological clear water ditch inflow sewage interception module 2, an ecological clear water ditch 3, a recycled water multi-unit rainwater garden 4, an ecological-biological-electrolytic coupling purification module 5 and solar power generation equipment 6.
Wherein, a plurality of ecological clean water ditch inflow interception module 2 set up around the stack yard 1, and the runoff of stack yard 1 flows into ecological clean water ditch inflow interception module 2 in. The surface runoff in the storage yard 1 enters the ecological water purification ditch inflow interception module 2 to intercept floaters, filter suspended matters and adsorb ammonia nitrogen. Specifically, as fig. 3~5, ecological clear water ditch inflow interception dirty module 2 includes: the floating object intercepting filter screen 21, the zeolite filler filtering layer 22, the plants 23 and the module frame 24 are detachably assembled; the module frame 24 is arranged on the water inlet edge of the ecological water purification ditch 3 and is lower than the ground of the storage yard 1 by 10cm, the floater intercepting filter screens 21 are detachably arranged on the water inlet side and the water outlet side of the module frame 24, and the detachable pollution intercepting filter screens 21 are fixed on the module frame 24 in the conventional common installation mode. The interception filter screen 21 is used for intercepting floating objects with large surface runoff in the storage yard 1, and suspended matters are removed through the zeolite filler filtering layer 22, so that the floating objects are prevented from entering the ecological water purification ditch 3 to be deposited and block the ditch. The zeolite filler filtering layer 22 is filled in the module frame 24, and plants 23 are planted on the surface layer of the zeolite filler filtering layer 22; the floater intercepting filter screen 21 is a stainless steel filter screen with phi 3 to 5mm; the zeolite filler filter layer 22 is composed of zeolite filler with the particle size of 3 to 8mm, the thickness of the zeolite filler filter layer 22 is 200-300mm, and the zeolite filler filter layer 22 is used for adsorbing and removing ammonia nitrogen in runoff of a storage yard and filtering and removing suspended matters; the plants 23 planted on the surface of the module frame 24 are used for beautifying the environment.
The ecological water purification ditch 3 and the reuse water multi-unit rainwater garden 4 are formed by adopting mechanical excavation and ramming with plain soil based on natural terrain; and impermeable HDPE films are laid on the inner surfaces of the ecological water purification ditch 3 and the reuse water multi-unit rainwater garden 4 so as to store surface runoff purification and reuse the surface runoff purification.
Referring to fig. 6 to 8, the eco-bio-electrolytic coupling purification module 5 is detachably installed in the denitrification unit 413 of the eco clean water trench 3 and the reuse water multi-unit rainwater garden 4, and the number of installation and the module thickness of the eco-bio-electrolytic coupling purification module 5 are determined by the size and depth of the eco clean water trench 3 and the reuse water multi-unit rainwater garden 4. The eco-bio-electrolytic coupling purification module 5 in the denitrification unit 413 of the multi-unit rainwater garden 4 for the eco clean water trench 3 and the reuse water includes: a suspension type module frame 51, a natural fiber filler layer 52, a mesh iron plate anode 53, a mesh iron plate cathode 54, solar power supply equipment 55 and plants 56; netted iron plate positive electrode 53, netted iron plate negative electrode 54 set up in suspension type module frame 51, natural fiber filler layer 52 is filled inside suspension type module frame 51, to the loading single anode double cathode or single anode three-cathode in suspension type module frame 51, the cross-section of netted iron plate positive electrode 53 is perpendicular with the rivers direction in the suspension type module frame 51, netted iron plate positive electrode 53 and netted iron plate negative electrode 54 link to each other with the positive pole and the negative pole of the constant voltage power supply of direct current in the solar energy power supply unit 55 respectively. By means of electrolysis, the mesh iron plate anode 53 loses electrons to generate ferrous ions and iron ions to be combined with phosphate in runoff, so that flocculation removal of phosphorus is realized; meanwhile, electrons of the mesh-shaped iron plate cathode electrode 54 are used for generating hydrogen to enrich the hydrogen autotrophic denitrifying bacteria, and nitrogen removal is realized without an external carbon source; the planting mode of the plant 3 of the ecological-biological-electrolytic coupling purification module is as follows: natural fiber filler is used as a supporting carrier for plant cultivation and is placed in the module suspension type frame 51.
Referring to fig. 1, the reuse water multi-unit rainwater garden 4 comprises a multi-stage purification unit 41, a filtration unit 42 and a water storage unit 43, wherein the multi-stage purification unit 41 comprises a precipitation unit 411, a nitrification unit 412 and a denitrification unit 413 which are sequentially arranged, a gravel filter layer and plants 4121 are arranged in the nitrification unit 412, and an eco-bio-electrolytic coupling purification module 5 is arranged in the denitrification unit 413; the runoff purified by the multistage water purification unit 41 enters the filtering unit 42, a quartz sand filtering layer 421 is arranged in the filtering unit 42, and plants 422 are planted on the upper part of the quartz sand filtering layer 421; the effluent of the filtering unit 42 enters a water storage unit 43 planted with emergent aquatic plants 431, and is pumped for reuse through a submersible sewage pump 432 arranged in the water storage unit 43.
Referring to fig. 2, when the system is in operation, flushing water or rainwater runoff on the storage yard 1 enters the ecological water purification ditch inflow interception module 2, surface runoff floaters and suspended matters on the storage yard 1 can be intercepted by the detachable filter screen 21 on the water inlet side of the ecological water purification ditch inflow interception module 2, and water is discharged by the detachable filter screen 21 on the water outlet side after the suspended matters and ammonia nitrogen are filtered and removed by the zeolite filler filter layer 22; effluent flows into an ecological water purification ditch 3 loaded with an ecological-biological-electrolytic coupling purification module 5, a natural fiber filler layer 52 in the ecological-biological-electrolytic coupling purification module 5 is enriched with a large number of microorganisms, and phosphorus and nitrogen removal is enhanced through electrolysis; the effluent of the ecological water purification ditch 3 enters a reuse water multi-unit rainwater garden 4.
The ecological-biological-electrolytic coupling purification module is connected with solar power generation equipment, can be freely disassembled and replaced, and is convenient for maintenance and landscape design of the ecological water purification ditch 3 and the reuse water multi-unit rainwater garden 4.
The surface runoff pollutants collected and purified by the invention come from surface flushing water and surface runoff in a storage yard, and the treated effluent reaches the reuse water standard of urban sewage recycling urban miscellaneous water quality (GB/T18920-2002).
Claims (4)
1. A system for collecting, purifying, storing and recycling surface runoff of a railway storage yard is characterized by comprising: the system comprises an ecological clean water ditch inflow sewage interception module (2) arranged around a storage yard (1), an ecological clean water ditch (3) internally provided with an ecological-biological-electrolytic coupling purification module (5), and a reuse water multi-unit rainwater garden (4) arranged at the water outlet end of the ecological clean water ditch (3);
the ecological water purification ditch (3) is arranged at the water outlet end of the ecological water purification ditch inflow sewage interception module (2);
surface runoff in the storage yard (1) passes through an ecological water purification ditch inflow interception module (2) arranged in front of the ecological water purification ditch (3) to intercept floating matters, filter suspended matters and adsorb ammonia nitrogen; then, the effluent enters an ecological water purification ditch (3), and nitrogen, phosphorus and organic matters are removed through an ecological-biological-electrolytic coupling purification module (5) arranged in the ecological water purification ditch (3); the purified effluent flows into a multi-unit rainwater garden (4) for reuse to be further purified, stored and reused; the eco-bio-electrolytic coupling purification module (5) comprises: a suspension type module frame (51), a natural fiber filler layer (52), a mesh iron plate anode electrode (53), a mesh iron plate cathode electrode (54), solar power supply equipment (55) and plants (56);
the filling density of the natural fiber filler layer (52) in the suspension type module frame (51) is 40-60%; the cross section area of the suspension type module frame (51) is equal to that of the ecological water purification ditch (3);
the electrode aperture of the meshed iron plate anode electrode (53) and the meshed iron plate cathode electrode (54) is 5-10mm, the meshed iron plate anode electrode (53) is externally connected with the anode of a solar power supply device (55) through a wire, and the meshed iron plate cathode electrode (54) is externally connected with the cathode of the solar power supply device (55) through a wire;
the electrodes are arranged in a single-anode double-cathode mode or a single-anode three-cathode mode, and when the electrodes are arranged in a single-anode double-cathode mode, 1 mesh iron plate cathode electrode (54) is placed at the two ends of the mesh iron plate anode electrode (54) at equal intervals; when the electrodes are arranged in a single-anode three-cathode mode, 3 meshed iron plate cathode electrodes (54) are arranged on one side of the meshed iron plate anode electrode (53) at equal intervals, and electrifying current in the ecological-biological-electrolytic coupling purification module (5) is connected with solar power supply equipment (55);
by means of electrolysis, the mesh iron plate anode (53) loses electrons to generate ferrous ions and iron ions to be combined with phosphate in runoff, so that the flocculation removal of phosphorus is realized; meanwhile, electrons of the mesh iron plate cathode electrode (54) are used for generating hydrogen to enrich the hydrogen autotrophic denitrifying bacteria, and nitrogen removal is realized without an external carbon source;
the planting mode of the plants (56) of the ecological-biological-electrolytic coupling purification module (5) is as follows: natural fiber filler is used as a supporting carrier for plant planting and is placed in a suspension type module frame (51);
the recycled water multi-unit rainwater garden (4) is composed of a multi-stage purification unit (41), a filtering unit (42) and a water storage unit (43), the multi-stage purification unit (41) comprises a precipitation unit (411), a nitrification unit (412) and a denitrification unit (413) which are sequentially arranged, a gravel matrix layer and plants (4121) are arranged in the nitrification unit (412), and an ecological-biological-electrolytic coupling purification module (5) is arranged in the denitrification unit (413); the runoff purified by the multi-stage purification unit (41) enters a filtering unit (42), a quartz sand filtering layer (421) is arranged in the filtering unit (42), and plants (422) are planted on the upper part of the quartz sand filtering layer (421); the effluent of the filtering unit (42) enters a water storage unit (43) planted with emergent aquatic plants (431), and is pumped by a submersible sewage pump (432) arranged in the water storage unit (43) for recycling.
2. The system for collecting, purifying, storing and recycling surface runoff of a railway yard of claim 1, wherein the ecological clear water inflow interception module (2) comprises: the floating object intercepting filter screen (21), the zeolite filler filter layer (22), the plants (23) and the module frame (24) are detachably assembled;
the module frame (24) is arranged at the water inlet edge of the ecological water purification ditch (3), the bottom of the module frame (24) is arranged 10cm lower than the ground surface of the storage yard (1), the floater intercepting filter screens (21) are arranged at the water inlet side and the water outlet side of the module frame (24), the zeolite filler filter layer (22) is filled in the module frame (24), and plants (23) are planted on the surface layer of the module frame (24);
the floater intercepting filter screen (21) is a stainless steel filter screen with phi 3 to 5 mm;
the zeolite filler filtering layer (22) is composed of zeolite filler with the grain diameter of 3 to 8mm, the thickness of the zeolite filler filtering layer (22) is 200-300mm, and the zeolite filler filtering layer (22) is used for adsorbing and removing ammonia nitrogen in runoff of a storage yard and filtering and removing suspended matters;
the plants (23) planted on the surface layer in the module frame (24) are used for beautifying the environment.
3. The system for collecting, purifying, storing and recycling surface runoff of a railway yard of claim 1, wherein the ecological clear water trench (3) and the recycled water multi-unit rainwater garden (4) are formed by mechanical excavation based on natural terrain and tamping with plain soil; impermeable HDPE films are paved on the inner surfaces of the ecological water purification ditch (3) and the reuse water multi-unit rainwater garden (4) so as to store surface runoff for purification and reuse.
4. The rail yard surface runoff collection, purification, storage and reuse system according to claim 1 wherein the eco-bio-electrolytically coupled purification modules (5) are detachably mounted in the denitrification units (413) of the eco clean water trench (3) and the reuse water multi-unit rainwater garden (4), and the number of the eco-bio-electrolytically coupled purification modules (5) and the module thickness are determined by the size and depth of the eco clean water trench (3) and the reuse water multi-unit rainwater garden (4).
Priority Applications (1)
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