CN112225320A - Mine wastewater treatment system and application thereof - Google Patents
Mine wastewater treatment system and application thereof Download PDFInfo
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- CN112225320A CN112225320A CN202011038675.7A CN202011038675A CN112225320A CN 112225320 A CN112225320 A CN 112225320A CN 202011038675 A CN202011038675 A CN 202011038675A CN 112225320 A CN112225320 A CN 112225320A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
- 239000002351 wastewater Substances 0.000 claims abstract description 68
- 230000004888 barrier function Effects 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000945 filler Substances 0.000 claims abstract description 6
- 229910021536 Zeolite Inorganic materials 0.000 claims description 36
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 36
- 239000010457 zeolite Substances 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 239000006004 Quartz sand Substances 0.000 claims description 23
- 241000196324 Embryophyta Species 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 239000002689 soil Substances 0.000 claims description 9
- 241000124844 Sedum alfredii Species 0.000 claims description 6
- 241000051984 Blepharidachne Species 0.000 claims description 4
- 241000223782 Ciliophora Species 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 244000071493 Iris tectorum Species 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 235000004224 Typha angustifolia Nutrition 0.000 claims description 3
- 240000001398 Typha domingensis Species 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 244000166783 Cymbopogon flexuosus Species 0.000 claims description 2
- 241001428136 Grateloupia filicina Species 0.000 claims description 2
- 241001518821 Typha orientalis Species 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 241000033009 Merremia Species 0.000 claims 1
- 229910021645 metal ion Inorganic materials 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000011521 glass Substances 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000004567 concrete Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 239000011150 reinforced concrete Substances 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 241001647091 Saxifraga granulata Species 0.000 description 4
- 241000233948 Typha Species 0.000 description 4
- -1 iron ions Chemical class 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001502129 Mullus Species 0.000 description 1
- 241000220156 Saxifraga Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment equipment, and discloses a mine wastewater treatment system and application thereof. The mine wastewater treatment system comprises a drainage tube, an adjusting tank, a permeable reaction wall and a water outlet tank according to the water flow direction; the permeable reactive barrier comprises a reactive area and a plant growing area covering the reactive area; the reaction area is divided into at least 3 reaction areas by a detachable moving groove, and each reaction area is filled with different fillers. The mine wastewater treatment system combines phytoremediation with the permeable reactive barrier for use, can effectively prevent the permeable reactive barrier from being blocked, and prolongs the effective action time and the service life of the permeable reactive barrier; meanwhile, the detachable moving groove is convenient for replacing the filler regularly. The mine wastewater treatment system is adopted for wastewater treatment, the acidity of wastewater and the content of metal ions in water can be effectively reduced, and the treatment method is low in energy consumption, simple in process and convenient to operate and maintain.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment equipment, and particularly relates to a mine wastewater treatment system and application thereof.
Background
Mine wastewater is one of the most main pollution sources in mine environmental pollution, and the wastewater is mostly acidic and is mixed with a large amount of metal ions such as iron, copper, zinc and the like, so that the environmental pollution of the peripheral area of a mining area is easily caused if the mine wastewater is not treated well. Therefore, the treatment of the mine wastewater has great significance for protecting the ecological environment.
At present, the treatment method of mine wastewater mainly comprises an active treatment method mainly comprising a neutralization method, a vulcanization method, an adsorption method and the like. However, the active treatment method has many problems such as generation of a large amount of sludge and waste materials, high operation and maintenance costs, and the like. In recent years, passive treatment technologies mainly using permeable reactive barrier have been drawing attention from researchers for treating mine wastewater, and have the advantages of no need of power, low operation and maintenance cost, good treatment effect and the like. However, in the passive treatment technology, along with accumulation of substances such as suspended matters, heavy metal precipitates and the like in the wastewater in the permeable reactive barrier, the permeable reactive barrier is seriously blocked and loses activity, the service life of the wall is short, and the wall is complicated to replace and the cost is high.
Therefore, it is desirable to provide a mine wastewater treatment system that can extend the useful life of the permeable reactive barrier.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a mine wastewater treatment system which can prolong the service life of a permeable reactive barrier.
A mine wastewater treatment system comprises a drainage tube, an adjusting tank, a permeable reaction wall and a water outlet tank according to the water flow direction; the drainage tube, the regulating reservoir, the permeable reaction wall and the water outlet pool are connected in sequence; the permeable reactive barrier comprises a reactive area and a plant planting area covering the reactive area;
the reaction area is divided into at least 3 reaction areas by a detachable moving groove, and each reaction area is filled with different fillers.
Preferably, the reaction zone is sequentially filled with quartz sand, natural zeolite and cobblestones according to the water flow direction to form a quartz sand reaction zone, a natural zeolite reaction zone and a cobblestone reaction zone.
Preferably, the natural zeolite is filled according to gradation and the particle size is sequentially from small to large; further preferably, the particle sizes of the natural zeolite are 1-2mm, 2-4mm and 4-8mm respectively.
The natural zeolite is filled in different reaction zones in sequence from small to large according to gradation, along with water flow, small particles are flushed into gaps among the particles to form uniform interception bodies, and the treatment efficiency can be effectively improved. If the natural zeolite is prepared according to the gradation, the particle size is filled from large to small in sequence, large particles cannot enter small particle gaps, a good interception effect cannot be achieved, blockage is easily caused, and the treatment effect is further influenced.
Preferably, the particle size of the quartz sand is 0.5-1 mm; the particle size of the cobblestones is 10-30 mm.
Preferably, the plant growing area comprises planting soil and plants planted on the planting soil; the plant is selected from at least two of Typha angustifolia, Cymbopogon flexuosus, Iris tectorum, Sedum alfredii Hance or Grateloupia filicina L.
Further preferably, at least one of typha orientalis, saxifrage or iris tectorum is planted in the quartz sand reaction zone, and sedum alfredii or/and ciliate desert-grass is planted in the natural zeolite reaction zone.
In the process of wastewater purification, different plants are planted, so that the advantages of the reaction zone and the repair of different plants are combined.
The permeable reactive barrier is of an overground brick-concrete structure, the bottom of the permeable reactive barrier is made of reinforced concrete, and water outlets are arranged on the wall body connected with the water outlet pool at equal intervals.
The drainage tube is a PVP tube, and a valve is arranged on the drainage tube so as to control the flow rate.
The regulating reservoir is of a brick-concrete structure, the bottom of the regulating reservoir is made of reinforced concrete, and water outlets are distributed on the wall body, connected with the permeable reactive wall, of the regulating reservoir at equal intervals.
The water outlet pool is of a brick-concrete structure, the bottom of the water outlet pool is made of reinforced concrete, and a water outlet is arranged at a position 0.1-0.2m away from the bottom of the water outlet pool.
Preferably, the effluent pool is filled with cobblestones, and the particle size of the cobblestones is 50-100 mm.
The detachable moving groove is made of a carbon steel plate, angle steel and a perforated plate; can dismantle the welding of removal groove both ends has the handle, the later stage of being convenient for lifts by crane through the hoist and changes the material, promotes the convenience in the use.
The mine wastewater treatment system can be enlarged or reduced in size according to the water quantity.
The mine wastewater treatment system is applied to treatment of mine wastewater.
A treatment method of mine wastewater adopts the mine wastewater treatment system to carry out treatment.
The treatment method of the mine wastewater comprises the following steps:
(1) mine wastewater enters the adjusting tank through the drainage tube;
(2) mine wastewater enters the permeable reactive barrier from the regulating reservoir, sequentially flows through the quartz sand reaction zone, the natural zeolite reaction zone and the cobblestone reaction zone, and stays in the reaction zones;
(3) and the water treated by the permeable reactive barrier enters the water outlet pool and is led out.
Preferably, the residence time of the mine wastewater in the regulating reservoir is 1-2 h.
Preferably, the residence time of the mine wastewater in the quartz sand reaction zone is 0.5-1 h.
Preferably, the residence time of the mine wastewater in the natural zeolite reaction zone is 1-2 h.
Preferably, the residence time of the mine wastewater in the cobblestone reaction zone is 10-20 min.
Specifically, the treatment method of the mine wastewater comprises the following steps:
(1) mine wastewater enters a regulating reservoir through a drainage tube, and the average residence time of the wastewater in the regulating reservoir is 1-2 h;
(2) mine wastewater enters the permeable reactive barrier from the regulating reservoir, flows through the quartz sand reaction zone firstly, intercepts suspended matters through the quartz sand, absorbs metal ions through plants, and stays in the quartz sand zone for 0.5-1 h; then, the wastewater passes through a natural zeolite reaction zone, wherein the zeolite component is alkali metal oxide, the pH of the wastewater is further adjusted, metal ions in the wastewater are adsorbed, the metal ions in the wastewater are adsorbed by hyper-enriched plants planted in a zeolite zone, and the residence time of the mine wastewater in the zeolite zone is 1-2 h; and then passing through a cobblestone reaction zone to further intercept suspended matters in water, wherein the retention time of the mine wastewater in the cobblestone zone is 10-20 min.
(3) The water treated by the permeable reactive barrier enters a water outlet pool, and is drained to a surrounding receiving water body through a ditch, or is used for farmland irrigation water and the like. The water quality of the water outlet is regularly monitored, and the maintenance is regularly carried out to ensure that the wastewater treatment reaches the standard and is discharged.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the mine wastewater treatment system, the plant restoration and the permeable reactive barrier are combined for use, so that the permeable reactive barrier can be effectively prevented from being blocked, and the effective action time and the service life of the permeable reactive barrier are prolonged. Meanwhile, the detachable moving groove in the permeable reactive barrier facilitates regular replacement of the filler, and the long-term effectiveness of the mine wastewater treatment system is ensured.
(2) The mine wastewater treatment system is adopted for wastewater treatment, and the hyperaccumulator is combined with adsorption interception, so that the acidity of the wastewater and the content of metal ions in the wastewater can be effectively reduced, the absorption rate of iron ions in the wastewater reaches 97.7%, and the absorption rate of zinc ions reaches 95.5%; and the treatment method has low energy consumption, simple process and convenient operation and maintenance.
Drawings
FIG. 1 is a schematic sectional view of a mine wastewater treatment system according to example 1;
a water conduit 100; a regulating reservoir 200; a permeable reactive barrier 300; a plant growing area 310; a reaction zone 320; a detachable moving slot 322; a reaction zone 321; a water outlet pool 400; and a water outlet 500.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
Example 1
A mine wastewater treatment system is shown in figure 1, and comprises a drainage tube 100, an adjusting tank 200, a permeable reactive barrier 300, a water outlet tank 400 and a water outlet 500 in sequence along the water flow direction; the drainage tube 100, the regulating reservoir 200, the permeable reactive barrier 300 and the water outlet pool 400 are connected in sequence, and the water outlet 500 is arranged on the water outlet pool 400; the permeable reactive barrier 300 comprises a reactive area 320 and a plant growing area 310 covering the reactive area 320; the reaction zone 320 is divided by a removable moving bath 322 into at least 3 reaction zones 321, each reaction zone 321 being filled with a different packing.
The 100 materials of drainage tube select corrosion-resistant PVP pipe, and the pipe diameter is 100 and supplys water flow for 200mm, installs the ball valve on drainage tube 100 and is convenient for regulate and control the water yield.
The adjusting tank 200 is of a brick-concrete structure, the bottom of the adjusting tank is of a reinforced concrete structure, cement mortar is smeared around the adjusting tank 200, the effective length is 4-5m, the width is 4-5m, and the depth is 1.5-2 m; the wall body of the adjusting pool 200 connected with the permeable reactive barrier 300 is provided with water outlets at equal intervals at the position 0.2-0.5m away from the bottom of the pool, the number of the water outlets is about 5-10, and the diameter of the water outlets is 100-200 mm. The water outlet is made of PVP plastic pipe with a length of 30-50cm, and right-angle elbows are arranged at two ends of the water outlet and made of PVP. The water discharged from the drain port is discharged to the permeable reactive barrier 300.
The permeable reactive barrier 300 is a brick-concrete structure, the wall surface is coated with cement mortar, the bottom is reinforced concrete, the effective length is 4-4.5m, the width is 4-5m, and the depth is 1.5-2 m. The permeable reactive barrier 300 is divided into 3 reaction zones 321, which are a quartz sand reaction zone, a natural zeolite reaction zone and a cobblestone reaction zone in sequence along the water flow direction. The effective length of the quartz sand reaction zone is 0.8-1m, the filling height is 1-1.2m, the filling width is 4-4.5m, and the particle size of the quartz sand is distributed between 0.5-1 mm. The natural zeolite reaction zone is divided into 3 filling zones, the effective length of each filling zone is 0.8-1m, the filling height is 1-1.2m, the filling width is 4-4.5m, and the natural zeolite with the grain diameter of 1-2, 2-4 and 4-8mm is filled in sequence along the water flow direction. The effective length of the cobblestone reaction zone is 0.8-1m, the filling height is 1-1.2m, the filling width is 4-4.5m, and the particle size of cobblestones is 10-30 mm. The permeable reactive barrier 300 is filled with a material placed in the removable moving groove 322. The detachable moving groove 322 is made of a carbon steel plate (coated with anticorrosive paint), angle steel and a perforated plate, and has an effective length of 0.8-0.9m, a width of 3.9-4.9m and a depth of 1-1.5 m; each detachable moving groove 322 bears 10-15 tons; the handles are welded at the two ends of the detachable moving groove 322, so that the material can be lifted and replaced by a crane at the later stage conveniently.
Aquatic plants are planted in the quartz sand reaction area of the permeable reactive barrier 300, and cattail and saxifrage are selected. After the zeolite reaction area in the zeolite area is filled, planting soil with the length of 10-15cm is covered at the upper end, typha angustifolia, saxifrage and iris are respectively planted, sedum alfredii and ciliate desert-grass are intercropped, metal ions in water are further adsorbed, and the material replacement period in the permeable reactive barrier 300 is prolonged. The planting soil is a mixture of peat soil and commercially available organic fertilizer.
The outlet pool 400 is connected to the permeable reactive barrier 300 by a PVP drain pipe carrying a right angle bend. The water outlet pool 400 is of a brick-concrete structure, cement paste is smeared on the wall surface, reinforced concrete is arranged at the bottom, the effective length is 0.8-1m, the width is 4-5m, and the depth is 1.5-2 m; a water outlet 500 is arranged at a position 0.1-0.2m away from the bottom of the pool, and the pipe diameter of the water outlet 500 is 50-100 mm. The water outlet pool 400 is filled with cobblestones, and the particle size of the cobblestones is 50-100 mm.
The mine wastewater treatment method by using the mine wastewater treatment system specifically comprises the following operations:
mine wastewater enters the regulating reservoir 200 through the drainage tube 100, and the average residence time is 1 h. Along the water flow direction, the wastewater sequentially flows through the quartz sand reaction zone of the permeable reactive barrier 300 so as to remove suspended matters in the water, meanwhile, the planted aquatic organisms can further absorb metal ions in the water and create an anoxic condition, and the average residence time of the wastewater in the quartz sand reaction zone is 0.5 h; then the wastewater flows through the zeolite reaction zone in sequence, the pH of the wastewater is adjusted under the action of zeolite to adsorb metal ions in water, and meanwhile, plants planted in the zeolite zone further adsorb the metal ions in water or the trapped metal ions are adsorbed by the zeolite, so that the zeolite adsorption saturation period is effectively prolonged; the average residence time of the wastewater flowing through the zeolite reaction zone is 1.5 h; and finally, the wastewater flows through a cobblestone reaction zone to further remove suspended matters in the water, so that the wastewater is discharged after reaching the standard, and the retention time of the wastewater in the cobblestone zone is 15 min. The wastewater passing through the permeable reactive barrier 300 region passes through the effluent tank 400 containing the silica sand to further reduce suspended matter in the wastewater.
The water quality of the water outlet 500 is regularly monitored, and the plant harvesting and maintenance are regularly carried out to ensure that the wastewater treatment reaches the standard and is discharged. If the water quality exceeds the standard, the filler in the permeable reactive barrier 300 area is integrally taken out and replaced by new materials by a method of combining manpower with a crane, and plants are planted again.
Product effectiveness testing
1. To verify the effect of the process, the following simulation experiment was performed:
the drainage tube is replaced by a silicone tube, and the regulating tank is replaced by a 5L beaker; the permeable reactive barrier is made of organic glass according to the same proportion, the organic glass box is sequentially filled with quartz sand (the grain diameter is distributed between 0.5 mm and 1 mm), natural zeolite (the grain diameter is 1mm to 2mm, 2mm to 4mm and 4mm to 8mm) and cobbles (the grain diameter is distributed between 10 mm and 30mm), the length of each reaction area is 0.4 meter, the upper end of each quartz sand reaction area is covered with 10cm to 15cm of planting soil for planting cattail and mullet; the upper end of the natural zeolite reaction area is covered with 10cm of planting soil, cattail, saxifrage and iris are respectively planted, and sedum alfredii and ciliate desert-grass are intercropped. A water inlet and a water outlet are respectively arranged at two ends of the organic glass box; the permeable reaction wall is connected with the water outlet pool through a silicone tube, the water outlet pool is replaced by an organic glass column, the organic glass column is filled with cobbles, an opening at the lower end serves as a water outlet, and the water outlet pool is connected with the beaker through the silicone tube. 25L of mine water of a certain mine in Qingyuan city of Guangdong province is taken, the zinc content of the wastewater is 6.04mg/L, the iron content of the wastewater is 257.4mg/L, the pH value of the inlet water is 5.9, the other water quality indexes all meet the three water standards of surface water environment quality standards, the flow rate of the wastewater is adjusted to be 100mL/min or 200mL/min, the wastewater enters a permeable reaction wall from an adjusting tank and then enters a water outlet tank, and a water sample is taken from a beaker to detect the zinc ion content, the iron ion content and the pH value in the water. The results of the experiment are shown in table 1.
TABLE 1 treatment of mine wastewater
| Index of water quality | Wastewater flow rate of 100mL/min | Wastewater flow rate of 200mL/min |
| Zinc (mg/L) | 0.27 | 0.878 |
| Iron (mg/L) | 5.89 | 10.98 |
| pH | 6.4 | 6.2 |
As can be seen from Table 1, after the treatment of the mine wastewater treatment system, the acidity of the wastewater is obviously weakened, and the absorption rate of iron ions in the wastewater reaches 97.7%, and the absorption rate of zinc ions reaches 95.5%.
2. To verify the effect of the process, the following comparative simulation experiment (reduction of the reaction zone) was carried out:
the drainage tube is replaced by a silicone tube, and the regulating tank is replaced by a 5L beaker; the permeable reactive barrier is made of organic glass which is reduced according to the same proportion, quartz sand (the particle size is distributed between 0.5 mm and 1 mm) and cobblestones (the particle size is distributed between 10 mm and 30mm) are sequentially filled in an organic glass box, the length of each reactive area is 0.6 meter, 10cm of planting soil is covered at the upper end of each reactive area, and typha and saxifraga are planted. Two ends of the organic glass box are provided with holes respectively as a water inlet and a water outlet; the permeable reaction wall is connected with the water outlet pool through a silicone tube, the water outlet pool is replaced by an organic glass column, the organic glass column is filled with cobbles, an opening at the lower end serves as a water outlet, and the water outlet pool is connected with the beaker through the silicone tube. Taking 25L of actual wastewater of a certain mine in Qingyuan city, Guangdong province, wherein the zinc content of the wastewater is 6.04mg/L, the iron content of the wastewater is 257.4mg/L, the pH value of the inlet water is 5.9, the other water quality indexes all meet the three water standards of surface water environment quality standards, adjusting the flow rate of the wastewater to be 100mL/min or 200mL/min, enabling the wastewater to enter a permeable reaction wall from an adjusting tank, then entering a water outlet tank, and taking a water sample in a beaker to detect the zinc ion content and the pH value in the water. The results of the experiment are shown in table 2.
TABLE 2 treatment of mine wastewater
| Index of water quality | Wastewater flow rate of 100mL/min | Wastewater flow rate of 200mL/min |
| Zinc (mg/L) | 5.27 | 5.878 |
| Iron (mg/L) | 20.17 | 25.65 |
| pH | 5.91 | 5.92 |
As can be seen from Table 2, since the reaction zone of the permeable reactive barrier is reduced, the acidity of the wastewater is not significantly improved without passing through the natural zeolite reaction zone, and the absorption effect on iron ions and zinc ions in the wastewater is far inferior to the simulation experiment.
Claims (10)
1. A mine wastewater treatment system is characterized by comprising a drainage tube, an adjusting tank, a permeable reaction wall and a water outlet tank according to the water flow direction; the drainage tube, the regulating reservoir, the permeable reaction wall and the water outlet pool are connected in sequence; the permeable reactive barrier comprises a reactive area and a plant planting area covering the reactive area; the reaction area is divided into at least 3 reaction areas by a detachable moving groove, and each reaction area is filled with different fillers.
2. The mine wastewater treatment system according to claim 1, wherein the reaction zone is filled with quartz sand, natural zeolite, and pebbles in order in a water flow direction to form a quartz sand reaction zone, a natural zeolite reaction zone, and a pebble reaction zone.
3. The mine wastewater treatment system according to claim 2, wherein the natural zeolite reaction zone is filled with natural zeolite according to a gradation in which the particle size of the natural zeolite is sequentially from small to large; preferably, the particle sizes of the natural zeolite are respectively 1-2mm, 2-4mm and 4-8 mm.
4. The mine wastewater treatment system according to claim 2, wherein the quartz sand has a particle size of 0.5 to 1 mm; the particle size of the cobblestones is 10-30 mm.
5. The mine wastewater treatment system of claim 2, wherein the plant growing area comprises planting soil and plants; the plant is selected from at least two of Typha angustifolia, Cymbopogon flexuosus, Iris tectorum, Sedum alfredii Hance or Grateloupia filicina L.
6. The mine wastewater treatment system of claim 5, wherein the silica sand reaction zone is seeded with at least one of typha orientalis, merremia virgata, or iris; the sedum alfredii or/and ciliate desert-grass are planted in the natural zeolite reaction zone.
7. The mine wastewater treatment system of claim 1, wherein the removable mobile troughs are made of carbon steel plates, angle steel, and perforated plates; handles are welded at two ends of the detachable moving groove.
8. Use of the mine wastewater treatment system of any one of claims 1 to 7 in mine wastewater treatment.
9. A treatment method of mine wastewater, characterized in that the treatment is performed by using the mine wastewater treatment system according to any one of claims 2 to 6, and the treatment method of mine wastewater comprises the following steps:
(1) mine wastewater enters the adjusting tank through the drainage tube;
(2) mine wastewater enters the permeable reactive barrier from the regulating reservoir, sequentially flows through the quartz sand reaction zone, the natural zeolite reaction zone and the cobblestone reaction zone, and stays in the reaction zones;
(3) and the water treated by the permeable reactive barrier enters the water outlet pool and is led out.
10. The treatment method according to claim 9, wherein the residence time of the mine wastewater in the quartz sand reaction zone is 0.5-1 h; the residence time of the mine wastewater in the natural zeolite reaction zone is 1-2 h; the retention time of the mine wastewater in the cobblestone reaction zone is 10-20 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011038675.7A CN112225320A (en) | 2020-09-28 | 2020-09-28 | Mine wastewater treatment system and application thereof |
Applications Claiming Priority (1)
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| CN112979088A (en) * | 2021-03-09 | 2021-06-18 | 南昌航空大学 | Reduction barrier for treating slag acidic wastewater and application thereof |
| CN114042740A (en) * | 2021-10-29 | 2022-02-15 | 南京大学 | Integrated restoration and risk management and control method for polluted soil and underground water |
| CN114702197A (en) * | 2022-03-09 | 2022-07-05 | 华北理工大学 | Adjustable mine effluent treatment plant |
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| CN112979088A (en) * | 2021-03-09 | 2021-06-18 | 南昌航空大学 | Reduction barrier for treating slag acidic wastewater and application thereof |
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| CN114702197A (en) * | 2022-03-09 | 2022-07-05 | 华北理工大学 | Adjustable mine effluent treatment plant |
| WO2022135619A3 (en) * | 2022-03-09 | 2022-12-08 | 华北理工大学 | Adjustable mine wastewater treatment device |
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