CN114368882A - High-pollution-load constructed wetland modular unit - Google Patents
High-pollution-load constructed wetland modular unit Download PDFInfo
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- CN114368882A CN114368882A CN202210141277.0A CN202210141277A CN114368882A CN 114368882 A CN114368882 A CN 114368882A CN 202210141277 A CN202210141277 A CN 202210141277A CN 114368882 A CN114368882 A CN 114368882A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 115
- 235000019738 Limestone Nutrition 0.000 claims abstract description 58
- 239000006028 limestone Substances 0.000 claims abstract description 58
- 238000005192 partition Methods 0.000 claims abstract description 41
- 230000008595 infiltration Effects 0.000 claims abstract description 23
- 238000001764 infiltration Methods 0.000 claims abstract description 23
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 14
- 230000002441 reversible effect Effects 0.000 claims abstract description 12
- 241001464837 Viridiplantae Species 0.000 claims abstract description 7
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 238000011001 backwashing Methods 0.000 claims description 78
- 239000010802 sludge Substances 0.000 claims description 26
- 238000011010 flushing procedure Methods 0.000 claims description 24
- 240000000275 Persicaria hydropiper Species 0.000 claims description 23
- 235000017337 Persicaria hydropiper Nutrition 0.000 claims description 23
- 239000000945 filler Substances 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 11
- 239000003344 environmental pollutant Substances 0.000 claims description 6
- 238000005325 percolation Methods 0.000 claims description 6
- 231100000719 pollutant Toxicity 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 17
- 238000010276 construction Methods 0.000 abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 description 16
- 239000011574 phosphorus Substances 0.000 description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 15
- 238000007599 discharging Methods 0.000 description 11
- 238000001914 filtration Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000009292 forward osmosis Methods 0.000 description 5
- 230000033764 rhythmic process Effects 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003911 water pollution Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000003181 biological factor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biodiversity & Conservation Biology (AREA)
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Abstract
The invention relates to a high-pollution load constructed wetland modular unit, which comprises an outer box with an opening on the top surface, an inner box with an opening on the top surface and a top cover, wherein a green plant pot is arranged on the top cover, and a water inlet pipe is arranged on the left side wall of the outer box; an inner water outlet is formed in the right side wall of the inner box, an outer water outlet is formed in the right side wall of the outer box, and water outlet pipes are arranged in the outer water outlet and the inner water outlet; the water outlet pipe is lower than the water inlet pipe; a connecting partition plate is arranged between the inner side walls of the inner box and the outer box, and a first through hole is formed in the connecting partition plate; the bottom surface of the inner box is provided with a second through hole, a middle partition plate is arranged in the inner box, and the middle partition plate is provided with a third through hole; a reverse osmosis structure is arranged between the inner box and the outer box; a positive infiltration structure is arranged in the inner box; the reverse infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially increasing from top to bottom, and the forward infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially decreasing from bottom to top. The invention can effectively realize the performances of artificial wetland modularization, easy construction and high stability of sewage treatment.
Description
Technical Field
The invention relates to the field of artificial wetlands, in particular to an artificial wetland modular unit with high pollution load.
Background
At present, the problems of water resource shortage, serious water pollution problem and insufficient sewage treatment degree still exist in China. The constructed wetland has the advantages of low energy consumption, good effluent quality, low economic cost and operation and maintenance cost, high landscape value and the like, and can effectively promote the treatment of sewage in China, thereby relieving the problems of serious water pollution and insufficient water resources. However, when the artificial wetland is newly built, the traditional construction method usually has larger engineering quantity and longer construction period, and the integrated installation is difficult to realize. In addition, in the long-term operation process of the traditional artificial wetland, if the design or management is not good, the blockage of the wetland is easily caused, and the blockage of the substrate is caused by various factors including physical factors, chemical factors and biological factors. Excessive plugging can lead to a decrease in the hydraulic conductivity of the wetland, a reduction in treatment efficiency, a reduction in operational life, and other problems. Aiming at the problems of the practical application of the artificial wetland, such as occupied area, low temperature influence, substrate blockage, high construction cost, long construction period, complex construction process, incapability of long-term operation, inconvenience in dead plant treatment and the like, the high-efficiency, economic and ecological-friendly performance of the artificial wetland is required to be realized, so that the stability of the sewage treatment of the artificial wetland is improved, the application of the modularized detachable artificial wetland in the wastewater treatment technology is popularized, particularly the application of the modularized detachable artificial wetland in the aspect of rural domestic sewage treatment is popularized, the sewage treatment degree is accelerated, and the problem of water pollution is solved.
Disclosure of Invention
The invention aims to provide a high-pollution load constructed wetland modular unit to realize the performances of constructed wetland modularization, easy construction and high stability of sewage treatment.
The invention relates to a high-pollution-load constructed wetland modular unit which comprises an outer box with an opening on the top surface, an inner box with an opening on the top surface and arranged in the outer box, and a top cover arranged at the opening of the outer box, wherein the top cover is provided with green planting holes for placing green plants, green planting pots are arranged in the green planting holes, the bottom surface of the outer box and the bottom surface of the inner box are arranged in a separated manner, the upper surface of the left side wall of the outer box is provided with a water inlet, and a water inlet pipe is arranged in the water inlet; an inner water outlet is formed in the upper surface of the right side wall of the inner box, an outer water outlet corresponding to the inner water outlet is formed in the upper surface of the right side wall of the outer box, and water outlet pipes which sequentially penetrate through the inner water outlet and the outer water outlet from inside to outside are arranged in the outer water outlet and the inner water outlet; the water outlet pipe is lower than the water inlet pipe; a connecting partition plate is arranged between the bottom edge of the inner box and the inner side wall of the outer box, and a plurality of first through holes penetrating in the vertical direction are formed in the connecting partition plate; the bottom surface of the inner box is provided with a plurality of second through holes which penetrate through the inner box in the vertical direction, a middle partition plate is arranged in the inner box, and the middle partition plate is provided with a plurality of third through holes which penetrate through the inner box in the vertical direction; a reverse osmosis structure is arranged between the inner box and the outer box, and is arranged above the connecting partition plate and below the water inlet pipe; a positive infiltration structure is arranged below the middle partition plate in the inner box; the reverse infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially increasing from top to bottom, and the forward infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially decreasing from bottom to top.
Furthermore, the reverse osmosis filtering structure comprises four limestone gravel layers which are respectively a first limestone gravel layer, a second limestone gravel layer, a third limestone gravel layer and a fourth limestone gravel layer from top to bottom; the positive infiltration structure comprises two limestone gravel layers, namely a fifth limestone gravel layer and a sixth limestone gravel layer from bottom to top.
Furthermore, the upper edge of the left side wall of the inner box is lower than the upper edge of the left side wall of the outer box; the top cover and the upper edge of the left side wall of the inner box are arranged in a separated mode.
Furthermore, a water distribution pipe which is arranged around the inner box is arranged between the inner box and the outer box, the water distribution pipe is positioned above the reverse osmosis filtration structure, the water inlet pipe is communicated with the water distribution pipe, and a plurality of drain holes are arranged on the water distribution pipe and surround the inner box.
Further, the green planting pot is a mine ecological type green planting pot of polygonum hydropiper, and a plurality of water soaking holes are formed in the side wall of the mine ecological type green planting pot of polygonum hydropiper.
Further, the mine ecological polygonum hydropiper green planting pot is internally provided with a filler, and the filler comprises a root planting soil layer, a coarse sand layer, a fine particle limestone layer and a medium-particle-size limestone soil mixing layer which are sequentially arranged from top to bottom.
Further comprises a back washing system, the back washing system comprises a first back washing hole arranged on the top cover, a second back washing hole arranged on the middle clapboard and corresponding to the first back washing hole, a third back washing hole arranged on the bottom surface of the inner box and corresponding to the second back washing hole, a fourth back washing hole arranged on the connecting clapboard and a back washing pipe structure, the back flushing pipe structure comprises a first back flushing pipe, a second back flushing pipe, a third back flushing pipe and a back flushing connecting pipe, the back flushing connecting pipe is transversely arranged between the bottom surface of the outer box and the bottom surface of the inner box, the first back flushing pipe sequentially passes through the first back flushing hole, the second back flushing hole and the third back flushing hole from top to bottom, the middle partition plate is also provided with a fifth backwashing hole, and the second backwashing pipe penetrates through the fifth backwashing hole from bottom to top and extends into the forward infiltration structure; the third backwashing pipe penetrates through the fourth backwashing hole from bottom to top and extends into the reverse osmosis structure; the lower end of the first back flushing pipe, the lower end of the second back flushing pipe and the lower end of the third back flushing pipe are communicated with the back flushing connecting pipe; the surface of the second backwashing pipe is provided with a plurality of second backwashing holes, and the surface of the third backwashing pipe is provided with a plurality of third backwashing holes.
Further, the bottom surface of the outer box is gradually inclined downwards from outside to inside.
Furthermore, be equipped with first mud discharging hole on the top cap, be equipped with on the intermediate bottom with the corresponding second mud discharging hole in first mud discharging hole, the bottom surface of inner box be equipped with the corresponding third mud discharging hole in second mud discharging hole, the third mud discharging hole with the bottom surface lower of outer container is corresponding, be equipped with the mud pipe in the first mud discharging hole, mud pipe top-down passes in proper order first mud discharging hole second mud discharging hole and third mud discharging hole and stretch to the lower of outer container bottom surface.
Furthermore, the lower surface of the top cover is provided with an upper hook, the upper surface of the middle partition plate is provided with a lower hook corresponding to the upper hook, and elastic filler is hung between the upper hook and the lower hook.
The invention has the advantages that a plurality of high-pollution load constructed wetland modular units are constructed, so that large-scale construction and installation can be realized; sewage enters the water distribution pipe from the water inlet pipe, sequentially passes through the reverse osmosis filtration structure, the connecting partition plate, the bottom of the outer box, the middle partition plate, the forward osmosis filtration structure and the mine ecological polygonum hydropiper green planting basin and finally enters the water outlet pipe, pollutants in the sewage can be efficiently removed through the reverse and forward rhythm osmosis filtration structure formed by the reverse osmosis filtration structure and the forward osmosis filtration structure, particularly, the removal rate of COD, TN, NH3-N and TP in the water is high, and meanwhile, the reverse osmosis system can be matched for aeration, so that the removal effect of the COD, TN, NH3-N and TP can be further improved. The high-pollution-load constructed wetland modular unit has the performances of modularization, easiness in construction, high efficiency and high stability in sewage treatment.
Drawings
Fig. 1 is a schematic structural diagram of a high pollution load constructed wetland modular unit according to the invention;
FIG. 2 is a schematic view of the structure of part A in FIG. 1;
FIG. 3 is a schematic view of the structure of the portion B in FIG. 1;
fig. 4 is a schematic structural diagram of an inner box, an outer box, a water inlet pipe, a water outlet pipe and a water distribution pipe of the high-pollution load constructed wetland modular unit;
fig. 5 is a schematic structural view of the top cover in fig. 1.
In the figure, 1-outer box, 2-inner box, 3-top cover, 4-green planting hole, 5-water inlet pipe, 6-water outlet pipe, 7-connecting partition, 8-first through hole, 9-second through hole, 10-middle partition, 11-third through hole, 12-first limestone gravel layer, 13-second limestone gravel layer, 14-third limestone gravel layer, 15-fourth limestone gravel layer, 16-fifth limestone gravel layer, 17-sixth limestone gravel layer, 18-water distribution pipe, 19-water discharge hole, 20-mine ecological polygonum hydropiper green planting basin, 21-planting soil layer, 22-coarse sand layer, 23-fine limestone layer, 24-medium-particle-diameter rock soil mixed layer, 25-first backwash pipe, 26-second backwash pipe, 27-third backwash pipe, 28-connecting pipe, 29-mud discharge pipe, 30-upper hook, 31-lower hook, 32-elastic filler, 33-water immersion hole, 34-mine ecotype polygonum hydropiper, 35-first mud discharging hole, 36-first back flushing hole.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the high pollution load constructed wetland modular unit comprises an outer box 1 with an open top surface, an inner box 2 with an open top surface and arranged in the outer box 1, and a top cover 3 arranged at the opening of the outer box 1, preferably, the inner box 2 and the outer box 1 can be made of SMC glass fiber reinforced plastic, a green planting hole 4 for placing green plants is arranged on the top cover 3, a green planting pot is arranged in the green planting hole 4, the bottom surface of the outer box 1 is separated from the bottom surface of the inner box 2, a water inlet is arranged on the upper surface of the left side wall of the outer box 1, and a water inlet pipe 5 is arranged in the water inlet; an inner water outlet is arranged on the upper surface of the right side wall of the inner box 2, an outer water outlet corresponding to the inner water outlet is arranged on the upper surface of the right side wall of the outer box 1, and water outlet pipes 6 sequentially penetrating through the inner water outlet and the outer water outlet from inside to outside are arranged in the outer water outlet and the inner water outlet; the water outlet pipe 6 is lower than the water inlet pipe 5; a connecting partition plate 7 is arranged between the bottom edge of the inner box 2 and the inner side wall of the outer box 1, and a plurality of first through holes 8 which penetrate through the connecting partition plate 7 in the vertical direction are formed; the bottom surface of the inner box 2 is provided with a plurality of second through holes 9 which penetrate through the inner box 2 in the vertical direction, a middle partition plate 10 is arranged in the inner box 2, and as shown in fig. 3, the middle partition plate 10 is provided with a plurality of third through holes 11 which penetrate through the inner box in the vertical direction; a reverse osmosis structure is arranged between the inner box 2 and the outer box 1, and is arranged above the connecting partition plate 7 and below the water inlet pipe 5; a positive infiltration structure is arranged below the middle partition plate 10 in the inner box 2; the reverse infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially increasing from top to bottom, and the forward infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially decreasing from bottom to top. The artificial wetland is designed into a unitized module through the matching of the inner box 2, the outer box 1 and the top cover 3, so that the artificial wetland is easy to popularize and copy; through the design of the water inlet pipe 5 and the water outlet pipe 6, water flows from the water inlet pipe 5 and flows out of the water outlet pipe 6, after entering the whole constructed wetland modular unit from the water inlet pipe 5, the water flows downwards gradually through the reverse osmosis structure between the inner box 2 and the outer box 1 until passing through the connecting partition plate 7 and enters the bottom of the outer box 1, after the gap between the inner box 2 and the bottom of the outer box 1 is filled with water gradually, impurities in the water are deposited gradually at the position, the water level gradually rises and overflows upwards through the forward osmosis structure gradually; finally, the water flows out of the water outlet pipe 6; in the process, water flow passes through a reverse-forward rhythm percolation structure formed by a reverse percolation structure and a forward percolation structure, and experimental results show that the reverse-forward rhythm percolation structure can generate a superposition effect, the action strength on nitrogen and phosphorus is higher than that of a single graded matrix, and the removal effect on COD, TN, NH3-N, TP and other components in the water is good, so that experimental results prove that the removal effect is good; meanwhile, the experimental result shows that the removal rate of the limestone gravels on pollution indexes is increased, although the permeability of the matrix can be reduced due to the fact that chemical precipitates generated by reaction of the limestone gravels and total phosphorus are attached to the inside of pores, the active materials of the limestone gravels and sewage generate a corrosion action, corrosion is formed on the surfaces of the gravels, corrosion grooves are formed, the void space of the whole structure is enlarged to a certain extent, the system is favorable for achieving corrosion-blockage dynamic balance, and negative effects caused by the chemical precipitates are effectively reduced. The green basin of planting 4 can be used to hold green, places green basin of planting and makes this constructed wetland modular unit have ornamental value, and is specific, and the design has 8 green holes of planting 4 on the top cap 3 in this embodiment. Preferably, the outer box 1 has a length of 1350mm, a width of 850mm and a height of 650 mm; the length of the inner box 2 is 1030mm, the width is 530mm, and the height is 555 mm. Preferably, the inner case 2 and the outer case 1 are both inverted trapezoidal in shape as a whole.
Preferably, the reverse osmosis filtration structure comprises four limestone gravel layers, from top to bottom, a first limestone gravel layer 12, a second limestone gravel layer 13, a third limestone gravel layer 14 and a fourth limestone gravel layer 15; the forward infiltration structure includes two limestone gravel layers, from bottom to top, a fifth limestone gravel layer 16 and a sixth limestone gravel layer 17, respectively. The reverse infiltration structure is designed with four limestone gravel layers, and the forward infiltration structure is designed with two limestone gravel layers; preferably, the first limestone gravel layer 12 has a thickness of 100mm and a particle size of 5-10 mm; the thickness of the second limestone gravel layer 13 is 100mm, and the particle size is 10-20 mm; the third limestone gravel layer 14 has a thickness of 100mm and a particle size of 20-30 mm; the thickness of the fourth limestone gravel layer 15 is 135mm, and the particle size is 30-40 mm; the fifth limestone gravel layer 16 has a thickness of 100mm and a particle size of 10-30mm, and the sixth limestone gravel layer 17 has a thickness of 100mm and a particle size of 10-30 mm.
Preferably, as shown in fig. 1, the upper edge of the left side wall of the inner box 2 is lower than the upper edge of the left side wall of the outer box 1; the top cover 3 is arranged away from the upper edge of the left side wall of the inner box 2. Form the overflow mouth through last edge of inner box 2 left side wall and between the top cap 3, when inside when taking place to block up, the water that gets into inlet tube 5 will flow out from this overflow mouth, prevents to take place to damage.
Preferably, as shown in fig. 2 and 4, a water distribution pipe 18 disposed in the inner tank 2 is disposed between the inner tank 2 and the outer tank 1, the water distribution pipe 18 is located above the reverse osmosis structure, the water inlet pipe 5 is communicated with the water distribution pipe 18, and a plurality of water discharge holes 19 are disposed on the water distribution pipe 18 around the inner tank 2. Through the design of water distributor 18, make rivers flow into reverse infiltration structure from the periphery of inner box 2 downwards, the infiltration efficiency is higher.
Preferably, as shown in fig. 2, the green planting pot is a mine ecological polygonum hydropiper green planting pot 20, and a plurality of water soaking holes 33 are formed in the side wall of the mine ecological polygonum hydropiper green planting pot 20. Water is made to enter the green plant pots through the water immersion holes 33 and moisten the green plants in the green plant pots. Preferably, as shown in fig. 1, the wetland plant in the green planting pot is the mine ecotype Polygonum hydropiper 34, which has stronger phosphorus enrichment advantage under the high-phosphorus soil and sewage treatment. Research shows that the phosphorus accumulation amount of the overground part of the mine ecological polygonum hydropiper is obviously increased along with the increase of the phosphorus concentration, and the increase range of the phosphorus accumulation amount is obviously higher than that of a non-mine type. Under the treatment of different phosphorus concentrations, the phosphorus accumulation amount of the overground part of the mine ecological polygonum hydropiper is obviously higher than that of the non-mine ecological polygonum hydropiper, and the difference is obviously increased along with the increase of the phosphorus concentration treatment level and is 1.7 to 3.3 times of that of the non-mine ecological polygonum hydropiper. If the mine ecological polygonum hydropiper is adopted as an artificial wetland plant in a large area, the harvested mine ecological polygonum hydropiper can be pyrolyzed to prepare biochar, according to experimental data, under the condition of the pyrolysis temperature of 400 ℃, the phosphorus recovery rate of the mine ecological polygonum hydropiper biochar can reach more than 98%, the phosphorus in the mine ecological polygonum hydropiper biomass is basically retained in the biochar by pyrolysis treatment, the total phosphorus content in the biochar reaches 11.46mg g < -1 >, and the phosphorus effectiveness and stability are optimal. Therefore, the mine ecotype polygonum hydropiper is a good phosphorus-containing wastewater ecological restoration material.
Preferably, the mine ecotype polygonum hydropiper green planting pot 20 is internally provided with a filler, and the filler comprises a root planting soil layer 21, a coarse sand layer 22, a fine particle limestone layer 23 and a medium-particle-size limestone soil mixing layer 24 which are sequentially arranged from top to bottom. Preferably, the thickness of the root planting soil layer 21 is 50 mm; the thickness of the coarse sand layer 22 is 50mm, and the grain diameter is 0.5-2 mm; the fine grained limestone layer 23 has a thickness of 50mm and a grain size of 2-3 mm; the thickness of the medium-grain diameter limestone soil mixed layer 24 is 100mm, and the grain diameter is 5-10 mm.
Preferably, the device also comprises a back washing system, wherein the back washing system comprises a first back washing hole 36 arranged on the top cover 3, a second back washing hole arranged on the middle partition plate 10 and corresponding to the first back washing hole 36, a third back washing hole arranged on the bottom surface of the inner box 2 and corresponding to the second back washing hole, a fourth back washing hole arranged on the connecting partition plate 7 and a back washing pipe structure, the back washing pipe structure comprises a first back washing pipe 25, a second backwashing pipe 26, a third backwashing pipe 27 and a backwashing connecting pipe 28, wherein the backwashing connecting pipe 28 is transversely arranged between the bottom surface of the outer box 1 and the bottom surface of the inner box 2, the first backwashing pipe 25 sequentially passes through the first backwashing hole 36, the second backwashing hole and the third backwashing hole from top to bottom, the middle partition plate 10 is also provided with a fifth backwashing hole, and the second backwashing pipe 26 passes through the fifth backwashing hole from bottom to top and extends into the forward infiltration structure; the third backwash pipe 27 passes through the fourth backwash hole from bottom to top and extends into the reverse osmosis structure; the lower ends of the first backwash pipe 25, the second backwash pipe 26 and the third backwash pipe 27 are communicated with a backwash connecting pipe 28; the surface of the second back-flushing pipe 26 is provided with a plurality of second back-flushing holes, and the surface of the third back-flushing pipe 27 is provided with a plurality of third back-flushing holes. By means of the back washing system, when the back filtration structure and the forward filtration structure are blocked, water can be introduced into the back washing system for washing, the water flow passes through the first back washing pipe 25 and the back washing connecting pipe 28 in sequence, and then the water flow flows out from the second back washing holes of the second back washing pipe 26 and the third back washing holes of the third back washing pipe 27 respectively for back washing. Meanwhile, a back washing system can be used for aeration, and researches show that the aeration is matched with the reverse-positive rhythm percolation structure, so that the removal rate of COD, TN, NH3-N and TP in water can be further improved, and a better decontamination effect is achieved.
Preferably, the bottom surface of the outer box 1 is inclined downward from the outside to the inside. The bottom surface of outer container 1 is the sunken shape in middle part, is similar to the mud bucket form, can make the better sediment of pollutant in the sewage and to the middle part gathering of outer container 1 bottom.
Preferably, as shown in fig. 5, a first sludge discharge hole 35 is formed in the top cover 3, a second sludge discharge hole corresponding to the first sludge discharge hole 35 is formed in the middle partition plate 10, a third sludge discharge hole corresponding to the second sludge discharge hole is formed in the bottom surface of the inner box 2, the third sludge discharge hole corresponds to the lowest position of the bottom surface of the outer box 1, a sludge discharge pipe 29 is arranged in the first sludge discharge hole 35, and the sludge discharge pipe 29 sequentially penetrates through the first sludge discharge hole 35, the second sludge discharge hole and the third sludge discharge hole from top to bottom and extends to the lowest position of the bottom surface of the outer box 1. Because the sediment of the pollutants in the water is gathered towards the middle part of the bottom of the outer box 1, the sludge at the bottom of the outer box 1 can be discharged through the sludge discharge pipe 29, and the pollutants can be discharged by a pump.
Preferably, the lower surface of the top cover 3 is provided with an upper hook 30, the upper surface of the middle partition plate 10 is provided with a lower hook 31 corresponding to the upper hook 30, and an elastic filler 32 is hung between the upper hook 30 and the lower hook 31. By suspending the elastomeric filler 32, the biofilm is utilized to further remove contaminants.
The embodiment of the invention is that a plurality of high-pollution load constructed wetland modular units are constructed, so that large-scale construction and installation can be carried out; sewage enters the water distribution pipe 18 from the water inlet pipe 5, sequentially passes through the reverse osmosis structure, the connecting partition plate 7, the bottom of the outer box 1, the middle partition plate 10, the forward osmosis structure and the mine ecological polygonum hydropiper green planting basin 20 and finally enters the water outlet pipe 6, pollutants in the sewage can be efficiently removed through the reverse and forward rhythm osmosis structure formed by the reverse osmosis structure and the forward osmosis structure, particularly, the removal rate of COD, TN, NH3-N and TP in the sewage is high, and meanwhile, the aeration is carried out by matching with a back flushing system, so that the removal effect of the COD, TN, NH3-N and TP can be further improved. The high-pollution-load constructed wetland modular unit has the performances of modularization, easiness in construction, high efficiency and high stability in sewage treatment. According to the filler proportion of the embodiment, the permeability coefficient of the filler is measured to be between 60m/d and 200m/d, wherein the porosity of the filler is between 0.25 and 0.35. The permeability coefficient and the porosity of the artificial wetland modular unit can meet the requirement of artificial wetland water distribution, and the removal rate of the total phosphorus of the artificial wetland modular unit with high pollution load can reach 80-95%. If a plurality of units are connected in parallel, the problem can be solved by adding a water collecting tank and a water distribution system at the front end, and if a plurality of units are connected in series, the water inlet and the water outlet of the middle unit are required to be set to be equal in height.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The high-pollution-load constructed wetland modular unit is characterized by comprising an outer box (1) with an open top surface, an inner box (2) with an open top surface and arranged in the outer box (1), and a top cover (3) arranged at the opening of the outer box (1), wherein a green planting hole (4) for placing green plants is formed in the top cover (3), a green planting pot is arranged in the green planting hole (4), the bottom surface of the outer box (1) is separated from the bottom surface of the inner box (2), a water inlet is formed in the upper surface of the left side wall of the outer box (1), and a water inlet pipe (5) is arranged in the water inlet; an inner water outlet is formed in the upper surface of the right side wall of the inner box (2), an outer water outlet corresponding to the inner water outlet is formed in the upper surface of the right side wall of the outer box (1), and water outlet pipes (6) sequentially penetrating through the inner water outlet and the outer water outlet from inside to outside are arranged in the outer water outlet and the inner water outlet; the water outlet pipe (6) is lower than the water inlet pipe (5); a connecting partition plate (7) is arranged between the bottom edge of the inner box (2) and the inner side wall of the outer box (1), and a plurality of first through holes (8) penetrating in the vertical direction are formed in the connecting partition plate (7); the bottom surface of the inner box (2) is provided with a plurality of second through holes (9) which penetrate through the inner box in the vertical direction, a middle partition plate (10) is arranged in the inner box (2), and the middle partition plate (10) is provided with a plurality of third through holes (11) which penetrate through the inner box in the vertical direction; a reverse infiltration structure is arranged between the inner box (2) and the outer box (1), and is arranged above the connecting partition plate (7) and below the water inlet pipe (5); a positive infiltration structure is arranged below the middle partition plate (10) in the inner box (2); the reverse infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially increasing from top to bottom, and the forward infiltration structure comprises at least two limestone gravel layers with the particle sizes sequentially decreasing from bottom to top.
2. A high pollutant load constructed wetland modular unit according to claim 1 wherein the reverse percolation structure comprises four limestone gravel layers, from top to bottom, a first limestone gravel layer (12), a second limestone gravel layer (13), a third limestone gravel layer (14) and a fourth limestone gravel layer (15) respectively; the positive infiltration structure comprises two limestone gravel layers, namely a fifth limestone gravel layer (16) and a sixth limestone gravel layer (17) from bottom to top.
3. The high pollution load constructed wetland modular unit according to claim 1, characterized in that the upper edge of the left side wall of the inner tank (2) is lower than the upper edge of the left side wall of the outer tank (1); the top cover (3) and the upper edge of the left side wall of the inner box (2) are arranged in a separated mode.
4. The high-pollution-load constructed wetland modular unit according to claim 1, characterized in that a water distribution pipe (18) arranged around the inner tank (2) is arranged between the inner tank (2) and the outer tank (1), the water distribution pipe (18) is positioned above the reverse osmosis structure, the water inlet pipe (5) is communicated with the water distribution pipe (18), and a plurality of water drainage holes (19) are arranged on the water distribution pipe (18) around the inner tank (2).
5. The high-pollution-load constructed wetland modular unit according to claim 1, wherein the green planting pot is a mine ecological polygonum hydropiper green planting pot (20), and a plurality of water soaking holes (33) are arranged on the side wall of the mine ecological polygonum hydropiper green planting pot (20).
6. The high-pollution-load constructed wetland modular unit according to claim 5, wherein the mine ecological polygonum hydropiper green planting basin (20) is internally provided with a filler, and the filler comprises a root planting soil layer (21), a coarse sand layer (22), a fine particle limestone layer (23) and a medium-particle-size limestone soil mixing layer (24) which are sequentially arranged from top to bottom.
7. The high pollution load constructed wetland modular unit according to claim 1, further comprising a back washing system, wherein the back washing system comprises a first back washing hole (36) arranged on the top cover (3), a second back washing hole arranged on the intermediate partition plate (10) and corresponding to the first back washing hole (36), a third back washing hole arranged on the bottom surface of the inner tank (2) and corresponding to the second back washing hole, a fourth back washing hole arranged on the connecting partition plate (7), and a back washing pipe structure, the back washing pipe structure comprises a first back washing pipe (25), a second back washing pipe (26), a third back washing pipe (27) and a back washing connecting pipe (28), the back washing connecting pipe (28) is transversely arranged between the bottom surface of the outer tank (1) and the bottom surface of the inner tank (2), the first backwashing pipe (25) sequentially penetrates through the first backwashing hole (36), the second backwashing hole and the third backwashing hole from top to bottom, a fifth backwashing hole is further formed in the middle partition plate (10), and the second backwashing pipe (26) penetrates through the fifth backwashing hole from bottom to top and extends into the forward infiltration structure; the third backwashing pipe (27) penetrates through the fourth backwashing hole from bottom to top and extends into the reverse osmosis structure; the lower end of the first back flushing pipe (25), the lower end of the second back flushing pipe (26) and the lower end of the third back flushing pipe (27) are communicated with the back flushing connecting pipe (28); a plurality of second backwashing holes are formed in the surface of the second backwashing pipe (26), and a plurality of third backwashing holes are formed in the surface of the third backwashing pipe (27).
8. The modular unit of high pollution load constructed wetland according to claim 1, wherein the bottom surface of the outer tank (1) is gradually inclined downwards from outside to inside.
9. The high-pollution-load constructed wetland modular unit according to claim 9, wherein a first sludge discharge hole (35) is formed in the top cover (3), a second sludge discharge hole corresponding to the first sludge discharge hole (35) is formed in the middle partition plate (10), a third sludge discharge hole corresponding to the second sludge discharge hole is formed in the bottom surface of the inner box (2), the third sludge discharge hole corresponds to the lowest position of the bottom surface of the outer box (1), a sludge discharge pipe (29) is arranged in the first sludge discharge hole (35), and the sludge discharge pipe (29) sequentially penetrates through the first sludge discharge hole (35), the second sludge discharge hole and the third sludge discharge hole from top to bottom and extends to the lowest position of the bottom surface of the outer box (1).
10. The high pollution load constructed wetland modular unit according to claim 1, wherein the lower surface of the top cover (3) is provided with an upper hook (30), the upper surface of the middle partition (10) is provided with a lower hook (31) corresponding to the upper hook (30), and an elastic filler (32) is hung between the upper hook (30) and the lower hook (31).
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| CN202210141277.0A CN114368882A (en) | 2022-02-16 | 2022-02-16 | High-pollution-load constructed wetland modular unit |
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| CN202210141277.0A CN114368882A (en) | 2022-02-16 | 2022-02-16 | High-pollution-load constructed wetland modular unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115403171A (en) * | 2022-08-30 | 2022-11-29 | 山东水利建设集团有限公司巨野分公司 | Filter tank device with uniform particle filter material |
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| CN217297598U (en) * | 2022-02-16 | 2022-08-26 | 四川省生态环境科学研究院 | High-pollution-load constructed wetland modular unit |
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| EP3468942A1 (en) * | 2016-12-15 | 2019-04-17 | Integrated Agriculture Systems, Inc. | Media bed for waste streams and systems employing the same |
| CN206624696U (en) * | 2017-03-12 | 2017-11-10 | 北京市勘察设计研究院有限公司 | A kind of composite vertical current artificial wetland structure with ecological protective functions |
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