CN111056704A - Unpowered sewage treatment system for natural negative topography of karst mountain wetland - Google Patents
Unpowered sewage treatment system for natural negative topography of karst mountain wetland Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F3/28—Anaerobic digestion processes
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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
Abstract
The invention discloses a natural negative topography unpowered sewage treatment system for a karst mountain wetland. The invention comprises a sewage collecting tank, an anaerobic tank, a filtering tank and a multi-stage wetland digestion tank, wherein the absolute elevations of the sewage collecting tank, the anaerobic tank, the filtering tank and the multi-stage wetland digestion tank are arranged in sequence from high to low; the adjacent pools are connected through water guide channels or pipelines. The domestic sewage treated by the method can reach the discharge standard, is suitable for karst mountain areas by combining the specific negative topography of the karst mountain wetland as a sewage treatment area, has the advantages of small occupied area, low investment cost, low energy consumption, low later maintenance cost and the like, and can beautify the environment and recycle pollutants in the domestic sewage. Therefore, the method is simple. The invention is a sewage treatment mode which is unpowered, energy-saving, environment-friendly, scientific and reasonable and has no secondary pollution.
Description
Technical Field
The invention relates to the field of purification of domestic sewage in karst mountainous regions, in particular to a natural negative topography unpowered sewage treatment system for a karst mountainous region wetland.
Background
The karst region has a complex geological background, most of rocks formed on the earth surface are soluble rocks, and a reticular underground river network is often formed. At present, a large amount of domestic sewage in many karst mountain areas is directly discharged to a ditch or a river, which not only causes the dirty and messy environment of people, but also easily causes the groundwater in the karst area to be permanently polluted. Therefore, the domestic sewage purification in the karst region is particularly important.
At present, some mature methods for domestic sewage treatment exist, but due to the topographic features of the karst region, the conventional domestic sewage treatment method is difficult to be put into use in the karst region. For example, patent CN108840445A provides an artificial wetland treatment system for treating rural domestic sewage, which mainly comprises a reservoir, a water guide channel, a plant pond, a filter material pond and an ultraviolet disinfection area. However, the processing system has large occupied area, and the later investment and use cost are high, so that the processing system cannot be used in a karst mountain area with 'three days in a sky and three miles in a ground'. Still like patent CN109231485A provides a domestic sewage treatment system, which comprises a sewage pipe, a drainage ditch and a water storage tank, wherein a sewage pump is arranged in the water storage tank. Although the floor space is not large, the patent needs to consume a large amount of electric energy, and the investment cost and the later maintenance cost are huge.
In summary, the following steps: the prior art has the defects of inapplicability to karst mountainous areas and high input cost and use cost.
Disclosure of Invention
The invention aims to provide a natural negative topography unpowered sewage treatment system for a karst mountain wetland. The method has the advantages of suitability for the karst mountain area, small occupied area, low investment cost, low energy consumption and low later maintenance cost.
The technical scheme of the invention is as follows: a karst mountain wetland natural negative topography unpowered sewage treatment system comprises a sewage collecting tank, an anaerobic tank, a filtering tank and a multi-stage wetland absorption tank, wherein the sewage collecting tank, the anaerobic tank, the filtering tank and the multi-stage wetland absorption tank are sequentially arranged from high to low in absolute elevation; the adjacent pools are connected through water guide channels or pipelines.
In the karst mountain wetland natural negative topography unpowered sewage treatment system, the anaerobic tank is a three-grid septic tank and comprises a first grid septic tank, a second grid septic tank and a third grid septic tank in a volume ratio of 2:1: 3.
In the karst mountain wetland natural negative topography unpowered sewage treatment system, the filter tank comprises a coarse gravel filter tank and a fine sand filter tank; emergent aquatic plants are arranged at the tops of the coarse gravel filter tank and the fine sand filter tank; the bottom of the coarse gravel filter tank and the bottom of the fine sand filter tank are provided with cobble layers; the thickness of the cobble layer of the coarse gravel filter tank is 40-50 mm; the thickness of the cobble layer of the fine sand filter tank is 10-20 mm.
In the karst mountain wetland natural negative topography unpowered sewage treatment system, the multistage wetland absorption pool is composed of wetland absorption pools of which the absolute elevations are sequentially arranged from high to low by 5-9.
In the karst mountain wetland natural negative topography unpowered sewage treatment system, the wetland absorption pool is a negative topography soft pit, the bottom of the soft pit is provided with geotechnical cloth, and the geotechnical cloth is provided with clay.
In the karst mountain wetland natural negative topography unpowered sewage treatment system, the multistage wetland digestion tank consists of 7 wetland digestion tanks; the first-stage wetland absorption pool, the second-stage wetland absorption pool, the third-stage wetland absorption pool, the fourth-stage wetland absorption pool, the fifth-stage wetland absorption pool, the sixth-stage wetland absorption pool and the seventh-stage wetland absorption pool are arranged from top to bottom in sequence; the pond water depth of the first-stage wetland absorption pond, the second-stage wetland absorption pond, the third-stage wetland absorption pond, the fourth-stage wetland absorption pond, the fifth-stage wetland absorption pond, the sixth-stage wetland absorption pond and the seventh-stage wetland absorption pond is 30-40cm, 40-50cm, 50-60cm, 60-70cm, 70-80cm, 80-90cm and 90-120cm in sequence; the clay filled is 55-60cm, 50-55cm, 45-50cm, 40-45cm, 35-40cm and 35-40cm in thickness; the first-stage wetland digestion tank and the second-stage wetland digestion tankAll the pond of the level wetland absorption pond, the third level wetland absorption pond, the fourth level wetland absorption pond, the fifth level wetland absorption pond and the sixth level wetland absorption pond are provided with the myriophyllum pratense; the seventh-level wetland digestion tank is internally provided with a plurality of wetland digestion tanks with the density of 10-15 plants/m215-20 strains/m2And 10-15 strains/m2Typha, allium mongolicum regel and lotus; ryegrass is arranged beside each pond
Experimental example: the experimental system is the system described in embodiment 3, the system is constructed in the prevision karst ecosystem observation research station of the national academy of sciences of the republic of san wan village, prefecture, and No. 3, in Guizhou province, the mortar masonry block stone structure has a little brick mixed structure, after the system is used for one month, the inventor samples water in nine absorption pools respectively, samples are respectively coded into No. 1-9 according to the first-level wetland absorption pool to the ninth-level wetland absorption pool, indexes of ammonia nitrogen, total phosphorus, anions, ph, dissolved oxygen, conductivity and the like of the samples are tested, and part of experimental test results are as follows:
1. the content of ammonia nitrogen in each sample is tested by adopting a nano reagent spectrophotometry, and the test result is shown in table 1:
TABLE 1 sample Ammonia Nitrogen test Table
2. The total phosphorus content in each sample was measured by the ketonic acid ammonium spectrophotometry, and the test results are shown in table 2:
TABLE 2 Total phosphorus test Table
3. The anion content in each sample was measured by volumetric method, and the results are shown in table 3:
TABLE 3 sample anion test Table
4. The temperature, conductivity, dissolved oxygen, and pH measurements of each sample were tested and the results are shown in table 4:
TABLE 4 sample temperature, conductance, dissolved oxygen, pH test table
| Sample numbering | PH | T(℃) | Conductance (uS/cm) | Dissolved oxygen (mg/L) |
| 1 | 7.694 | 24.4 | 1026 | 0.84 |
| 2 | 7.628 | 42.1 | 872 | 0.41 |
| 3 | 9.115 | 25.2 | 528 | 7.5 |
| 4 | 8.717 | 25.1 | 504 | 14.53 |
| 5 | 9.016 | 25.1 | 485 | 9.42 |
| 6 | 8.594 | 24.8 | 472 | 7.9 |
| 7 | 8.256 | 24.9 | 466 | 7.26 |
| 8 | 8.53 | 24.9 | 459 | 8.02 |
| 9 | 7.618 | 24.8 | 157 | 3.43 |
Through data analysis in tables 1-4, the content of various pollutants in the sewage is found to show a gradually decreasing trend on the whole under the action of 9 wetland absorption pools of the invention, and the content of the pollutants in the latter wetland absorption pools meets the comprehensive discharge standard of sewage of the people's republic of China (GB8978-1996), which indicates that the system of the invention has good purification effect.
5. The construction cost of the wetland absorption pool designed by the invention is low, and the results of easy construction and unit price of construction are obtained. As shown in fig. 2, it can be seen that the cost of the constructed wetland absorption pond of the present invention is low, and the construction cost is normally based on hundreds of cubic meters. Therefore, the constructed wetland absorption pool designed by the invention is low in construction, the overall construction cost of the wetland absorption pool can be reduced, and the wetland absorption pool is easy to popularize.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, domestic sewage is filtered by a grid net, so that large domestic garbage is collected in a sewage treatment system, the sewage enters a septic tank, the septic tank is changed into wastewater through anaerobic treatment, the wastewater is treated by a coarse gravel filter tank and a fine sand filter tank to absorb heavy metal elements and nitrogen and phosphorus elements in the wastewater tank to be changed into running water, the running water naturally flows into a multi-stage wetland absorption tank and a water guide channel to further absorb the nitrogen and phosphorus elements and the heavy metal elements, and finally the purified water can be discharged or used after reaching the standard.
2. The invention utilizes the principle of the AAO sewage treatment process and the characteristic topographic features of karst mountain wetland, selects proper natural negative topography as a sewage treatment area, and utilizes a sewage collecting pool, a septic tank, a coarse gravel filtering pool, a fine sand filtering pool and a multi-stage wetland digestion pool which are sequentially arranged from high to low according to absolute elevation, and a naturally formed drainage ditch or a simply constructed soil ditch among the pools can be directly used as a water guide ditch, so the invention has the characteristics of small floor area, low manufacturing cost, simple and easy material finding, strong operability and low maintenance cost, and sewage can flow automatically from top to bottom, thereby saving energy and protecting environment.
3. The invention arranges emergent aquatic plants, cattail, shallot and lotus beside each pool, which can not only treat sewage, but also beautify environment. Has the characteristics of recycling the substances, enjoying the landscape, not generating the three wastes and having strong applicability.
In conclusion, the domestic sewage treated by the method can reach the discharge standard, is suitable for karst mountain areas by combining the special negative topography of the karst mountain wetland as a sewage treatment area, has the advantages of small floor area, low investment cost, low energy consumption, low later maintenance cost and the like, and can beautify the environment and recycle pollutants in the domestic sewage. Therefore, the method is simple. The invention is a sewage treatment mode which is unpowered, energy-saving, environment-friendly, scientific and reasonable and has no secondary pollution.
Drawings
FIG. 1 is a schematic structural view of example 1;
fig. 2 is a graph showing the volume and construction unit price of the wetland digestion tank.
The labels in the figures are: 1-a reservoir, 2-a three-grid septic tank, 3-a coarse gravel filter tank, 4-a fine sand filter tank, 5-a first-level wetland absorption tank, 6-a second-level wetland absorption tank, 7-a third-level wetland absorption tank, 8-ryegrass, 9-a fourth-level absorption tank, 10-a fifth-level absorption tank, 11-a sixth-level absorption tank, 12-a seventh-level absorption tank, 13-a grid net, 14-a first-grid septic tank, 15-a second-grid septic tank, 16-a third-grid septic tank, 17-a cobble I, 18-a cobble II, 19-a water guide channel, 20-a water delivery pipeline, 21-a domestic garbage cleaning port, 22-a domestic sewage discharge channel or ditch, 23-a filter tank water inlet pipeline, 24-aquatic animals, 25-lotuses, cattail and allium plants, 26-sludge, 27-emergent aquatic plants, 28-clay and 29-water inlet of a water storage tank.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention. The structures or processes not specifically mentioned are conventional in the art.
Example 1. A karst mountain wetland natural negative topography unpowered sewage treatment system is shown in a schematic structural diagram in figure 1 and comprises a sewage collecting tank 1, a three-grid septic tank 2, a coarse gravel filtering tank 3, a fine sand filtering tank 4, a seven-grade wetland digestion tank and a water guide channel 19, wherein the absolute elevations of the sewage collecting tank, the three-grid septic tank, the coarse gravel filtering tank and the fine sand filtering tank are sequentially arranged from high to low. Wherein grid net 13 is inlayed in the inside slope of sewage collecting pit 1, and one side of sewage collecting pit is equipped with water inlet 29, and the top of sewage collecting pit is equipped with domestic sewage rubbish clearance mouth 21, and the sewage collecting pit bottom is filled with silt 26. The three-grid type septic tank 2 is divided into a first-grid septic tank 14, a second-grid septic tank 15 and a third-grid septic tank 16 with the volume ratio of 2:1:3, wherein one side of the first-grid septic tank 14 is provided with a water outlet, the bottom of the first-grid septic tank is filled with a sludge layer 26, two sides of the second-grid septic tank 15 are respectively provided with a water inlet and a water outlet, the bottom of the second-grid septic tank is filled with the sludge layer 26, one side of the third-grid septic tank 16 is provided with a water inlet, one side of the lower side of the third-grid septic tank is provided with a water outlet, the water outlet is connected to the. The top of the coarse gravel filter tank 3 is filled with clay, plants planted at the top are cattail 27, the bottom is filled with a silt layer 26, the middle part is filled with 42mm cobblestones, water at the top of the coarse gravel filter tank enters the coarse gravel filter tank through a small-hole filter tank pipeline 23, and a water pipeline 20 is arranged on one side of the filter tank and connected with the fine sand filter tank 4. The top of the fine sand filter tank 4 is filled with a clay layer 29, plants on the top are typha 27, the middle part of the fine sand filter tank is filled with 15mm cobblestones, water on the top of the coarse gravel filter tank enters the fine sand filter tank through a filter tank pipeline 23 with small holes, and water is discharged into a water guide channel or a ditch through a water outlet on one side below the filter tank. Geotextile is laid around the bottom of the 7-stage wetland absorption pool, clay layers 29 with different thicknesses of soil are filled on the geotextile, and ryegrass 8 is planted around the wetland absorption pool. The aqueduct or ditch 19 is filled with cobblestones, and ryegrass 8 is planted on both sides. The wall surfaces of the sewage collecting tank 1, the three-grid septic tank 2, the coarse gravel filtering tank 3 and the fine sand filtering tank 4 are formed by brick-concrete structures, and 425 white cement leakage-proof materials are brushed on the wall surfaces. The grid mesh 13 is a 1cm × 1cm gap grid mesh made of stainless steel. The water pipeline is a stainless steel pipeline with the inner diameter of 10 cm. The water inlet pipeline of the filtering tank adopts a stainless steel pipeline with the inner diameter of 20cm, and a plurality of small openings are formed in the pipeline, so that water at the top of the filtering tank can conveniently enter the filtering tank.
The seven-level wetland digestion tank is specifically a first-level wetland digestion tank with tank water depths of 35cm, 45cm, 55cm, 65cm, 75cm, 85cm and 105cm in sequenceThe system comprises a digestion tank, a second-stage wetland digestion tank, a third-stage wetland digestion tank, a fourth-stage wetland digestion tank, a fifth-stage wetland digestion tank, a sixth-stage wetland digestion tank and a seventh-stage wetland digestion tank; the clay filled in each pool is 57cm, 52cm, 47cm, 42cm, 37cm and 37cm in sequence; the first-stage wetland absorption pool, the second-stage wetland absorption pool, the third-stage wetland absorption pool, the fourth-stage wetland absorption pool, the fifth-stage wetland absorption pool and the sixth-stage wetland absorption pool are all planted with the myriophyllum pratense; the depth of the pond water of the seventh-level wetland absorption pond is 105cm, and the densities of the plants planted in the pond are 12 plants/m respectively217 strains/m2And 12 strains/m2Typha, allium mongolicum regel and lotus; ryegrass is arranged beside each pond.
Example 2. The unpowered sewage treatment system for the natural negative topography of the karst mountain wetland comprises a sewage collecting tank, a three-grid septic tank, a coarse gravel filtering tank, a fine sand filtering tank and a 5-level wetland digestion tank, wherein the sewage collecting tank, the three-grid septic tank, the coarse gravel filtering tank, the fine sand filtering tank and the 5-level wetland digestion tank are sequentially arranged from high to low in absolute elevation. And the adjacent pools are communicated with each other through pipelines and water guide channels. Wherein the grid net is inlayed in the inside slope of sewage collecting pit, and one side of sewage collecting pit is equipped with the water inlet, and the top of sewage collecting pit is equipped with domestic sewage rubbish clearance mouth, and the sewage collecting pit bottom is filled with silt. The three-grid septic tank comprises a first-grid septic tank, a second-grid septic tank and a third-grid septic tank, wherein the volume ratio of the first-grid septic tank to the second-grid septic tank is 2:1:3, a water outlet is formed in one side of the first-grid septic tank, a sludge layer is filled at the bottom of the first-grid septic tank, a water inlet and a water outlet are formed in two sides of the second-grid septic tank respectively, the bottom of the second-grid septic tank is filled with the sludge layer, a water inlet is formed in one side of the upper surface of the third-grid septic tank, a water outlet is formed in one side. The top of the coarse gravel filtering tank is filled with clay, plants planted at the top are cattail, the bottom of the coarse gravel filtering tank is filled with a silt layer, the middle part of the coarse gravel filtering tank is filled with 40mm cobblestones, water at the top of the coarse gravel filtering tank enters the coarse gravel filtering tank through a filtering tank pipeline with small holes, and a water pipeline is arranged on one side of the filtering tank and connected with the fine sand filtering tank. The top of the fine sand filter tank is filled with a clay layer, plants on the top of the fine sand filter tank are typha, 10mm cobblestones are filled in the middle of the fine sand filter tank, water at the top of the coarse gravel filter tank enters the fine sand filter tank through a small-hole filter tank pipeline, and water is discharged into a water guide channel or a ditch through a water outlet on one side below the filter tank. Geotextile is laid around the bottom of the 5-stage wetland absorption pool, clay layers with different thicknesses are filled in the geotextile, and ryegrass is planted around the wetland absorption pool. Cobblestones are filled in the water guide channel, and ryegrass is planted on two sides. The wall surfaces of the sewage collecting tank, the three-grid septic tank, the coarse gravel filtering tank and the fine sand filtering tank are formed by brick-concrete structures, and 425 white cement leakage-proof materials are brushed on the wall surfaces. The grid mesh is a 1cm × 1cm gap grid mesh made of stainless steel. The water pipeline is a stainless steel pipeline with the inner diameter of 10 cm. The water inlet pipeline of the filtering tank adopts a stainless steel pipeline with the inner diameter of 20cm, and a plurality of small openings are formed in the pipeline, so that water at the top of the filtering tank can conveniently enter the filtering tank.
The five-stage wetland absorption pool is specifically a first-stage wetland absorption pool, a second-stage wetland absorption pool, a third-stage wetland absorption pool, a fourth-stage wetland absorption pool and a fifth-stage wetland absorption pool with pool water depths of 30cm, 40cm, 50cm, 60cm and 70cm in sequence; the clay filled in each pool is 55cm, 50cm, 45cm, 40cm and 35cm in thickness in sequence; the pond of each pond is provided with the watermifoil; the fifth-level wetland absorption pool is planted with 10 plants/m in density215 strains/m2And 10 strains/m2Typha, allium mongolicum regel and lotus; ryegrass is planted beside each pond.
Example 3. The unpowered sewage treatment system for the natural negative topography of the karst mountain wetland comprises a sewage collecting tank, a three-grid septic tank, a coarse gravel filtering tank, a fine sand filtering tank, a nine-level wetland digestion tank and a water guide channel, wherein the sewage collecting tank, the three-grid septic tank, the coarse gravel filtering tank, the fine sand filtering tank, the nine-level wetland digestion tank and the water guide channel are sequentially arranged from high to low in absolute elevation. Wherein the grid net is inlayed in the inside slope of sewage collecting pit, and one side of sewage collecting pit is equipped with the water inlet, and the top of sewage collecting pit is equipped with domestic sewage rubbish clearance mouth, and the sewage collecting pit bottom is filled with silt. The three-grid septic tank is divided into a first-grid septic tank, a second-grid septic tank and a third-grid septic tank, one side of the first-grid septic tank is provided with a water outlet, a sludge layer is filled at the bottom of the first-grid septic tank, two sides of the second-grid septic tank are respectively provided with a water inlet and a water outlet, the bottom of the second-grid septic tank is filled with the sludge layer, one side of the third-grid septic tank is provided with a water inlet, one side of the third-grid septic tank is provided with a water outlet, the water outlet is connected to the coarse gravel filtering. The top of the coarse gravel filtering tank is filled with clay, the plants planted at the top are cattail, the bottom of the coarse gravel filtering tank is filled with a silt layer, the middle part of the coarse gravel filtering tank is filled with 50mm cobblestones, water at the top of the coarse gravel filtering tank enters the coarse gravel filtering tank through a filtering tank pipeline with small holes, and one side of the filtering tank is provided with a water pipeline connected with a fine sand filtering tank. The top of the fine sand filter tank is filled with a clay layer, plants on the top of the fine sand filter tank are typha, the middle part of the fine sand filter tank is filled with 20mm cobblestones, and water on the top of the coarse gravel filter tank enters the fine sand filter tank through a filter tank pipeline with small holes. Geotextile is laid around the bottom of the nine-stage wetland digestion tank, and clay layers with different thicknesses are filled in the geotextile. Cobblestones are filled in the water guide channel or the ditch, and ryegrass is planted on two sides. The wall surfaces of the sewage collecting tank, the three-grid septic tank, the coarse gravel filtering tank and the fine sand filtering tank are formed by brick-concrete structures, and 425 white cement leakage-proof materials are brushed on the wall surfaces. The grid mesh is a 1cm × 1cm gap grid mesh made of stainless steel. The water pipeline is a stainless steel pipeline with the inner diameter of 10 cm. The water inlet pipeline of the filtering tank adopts a stainless steel pipeline with the inner diameter of 20cm, and a plurality of small openings are formed in the pipeline, so that water at the top of the filtering tank can conveniently enter the filtering tank.
The nine-stage wetland absorption pool is a first-stage wetland absorption pool, a second-stage wetland absorption pool, a third-stage wetland absorption pool, a fourth-stage wetland absorption pool, a fifth-stage wetland absorption pool, a sixth-stage wetland absorption pool, a seventh-stage wetland absorption pool, an eighth-stage wetland absorption pool and a ninth-stage wetland absorption pool, wherein the pool water depth is 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, 100cm, 110cm and 120cm in sequence; the clay filled in each pool is 60cm, 55cm, 50cm, 45cm, 40cm and 40cm in thickness in sequence; the pond of each pond is provided with the watermifoil; the ninth-level wetland absorption pool is planted with 15 plants/m in density 220 strains/m2And 15 strains/m2Typha, allium mongolicum regel and lotus; each poolThe edges are all provided with ryegrass.
Claims (6)
1. The utility model provides a natural negative topography unpowered sewage treatment system of karst mountain region wetland which characterized in that: comprises a sewage collecting tank, an anaerobic tank, a filtering tank and a multi-stage wetland digestion tank which are sequentially arranged from high to low in absolute elevation; the adjacent pools are connected through water guide channels or pipelines.
2. The karst mountain wetland natural negative topography unpowered sewage treatment system of claim 1, characterized in that: the anaerobic tank is a three-grid septic tank and comprises a first grid septic tank, a second grid septic tank and a third grid septic tank in a volume ratio of 2:1: 3.
3. The karst mountain wetland natural negative topography unpowered sewage treatment system of claim 1, characterized in that: the filter tank comprises a coarse gravel filter tank and a fine sand filter tank; emergent aquatic plants are arranged at the tops of the coarse gravel filter tank and the fine sand filter tank; the bottom of the coarse gravel filter tank and the bottom of the fine sand filter tank are provided with cobble layers; the thickness of the cobble layer of the coarse gravel filter tank is 40-50 mm; the thickness of the cobble layer of the fine sand filter tank is 10-20 mm.
4. The karst mountain wetland natural negative topography unpowered sewage treatment system of claim 1, characterized in that: the multistage wetland absorption pool is composed of wetland absorption pools with 5-9 absolute elevations arranged in sequence from high to low.
5. The karst mountain wetland natural negative topography unpowered sewage treatment system of claim 4, characterized in that: the wetland absorption pool is a negative-topography soft pit, geotechnical cloth is arranged at the bottom of the soft pit, and clay is arranged on the geotechnical cloth.
6. The karst mountain wetland natural negative topography unpowered sewage treatment system of claim 5, characterized in that: the multi-stage wetland digestion tank is composed of 7A wetland absorption pool; the first-stage wetland absorption pool, the second-stage wetland absorption pool, the third-stage wetland absorption pool, the fourth-stage wetland absorption pool, the fifth-stage wetland absorption pool, the sixth-stage wetland absorption pool and the seventh-stage wetland absorption pool are arranged from top to bottom in sequence; the pond water depth of the first-stage wetland absorption pond, the second-stage wetland absorption pond, the third-stage wetland absorption pond, the fourth-stage wetland absorption pond, the fifth-stage wetland absorption pond, the sixth-stage wetland absorption pond and the seventh-stage wetland absorption pond is 30-40cm, 40-50cm, 50-60cm, 60-70cm, 70-80cm, 80-90cm and 90-120cm in sequence; the clay filled in each pool has the thickness of 55-60cm, 50-55cm, 45-50cm, 40-45cm, 35-40cm and 35-40cm in sequence; the first-stage wetland absorption pool, the second-stage wetland absorption pool, the third-stage wetland absorption pool, the fourth-stage wetland absorption pool, the fifth-stage wetland absorption pool and the sixth-stage wetland absorption pool are all provided with armstrong algae; the seventh-level wetland digestion tank is internally provided with a plurality of wetland digestion tanks with the density of 10-15 plants/m215-20 strains/m2And 10-15 strains/m2Typha, allium mongolicum regel and lotus; ryegrass is arranged beside each pond.
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