CN110127851A - A circular landscape water purification artificial wetland system using ecological concrete - Google Patents

Abstract

The invention discloses a circular landscape water purification artificial wetland system using ecological concrete, which includes a water distribution system and a circular base for seepage prevention. The circular base is provided with a circular water collection tank and located in the collection The multi-layer ring-shaped ecological concrete wall on the outside of the tank; the multi-layer ring-shaped ecological concrete wall is concentric and decreases in height from the outside to the inside; a mixed filler layer is arranged between the two adjacent layers of the ring-shaped ecological concrete wall; the outermost layer The outer surface of the annular ecological concrete wall is laid with an anti-seepage layer; the water distribution pipeline of the water distribution system is laid along the top of the outermost annular ecological concrete wall. Through the synergistic effect of multiple plants and filler layers, the present invention has a significant removal effect on nitrogen and phosphorus in water bodies, has a good landscape effect, and can also verify the quality of wetland effluent.

Description

A circular landscape water purification artificial wetland system using ecological concrete

technical field

The invention relates to a constructed wetland system, in particular to a circular landscape water purification constructed wetland system using ecological concrete.

Background technique

At present, landscape water bodies generally have a small water area, and most of them are closed and slow-flowing water bodies with static or poor fluidity. The injection of runoff increases the pollutants in the water, especially the accumulation of nitrogen and phosphorus nutrients. When the temperature is high, it is easy to cause eutrophication of the water body, and even the outbreak of algal blooms, which seriously affects the visual effect of the surrounding landscape and loses the function of the landscape water body. , It also reduces the quality of human settlements and affects the construction of urban ecology. At present, many urban landscape water bodies are polluted to varying degrees, and the phenomenon of water body odor and eutrophication is relatively serious. According to the 2015 China Environmental Status Bulletin, the surface water quality in my country is generally slightly polluted, of which 35.5% are of Class V and worse than Class V. The polluted area of lakes and reservoirs in my country reaches 70%, the pollution load is still increasing, and the problem of eutrophication is becoming more and more serious.

For landscape water purification, among the existing technologies, the operating constructed wetland treatment technology has the characteristics of high efficiency, low investment, low operating cost, and low maintenance technology. At present, the constructed wetland treatment system is divided into surface flow wetland treatment system, subsurface flow wetland treatment system and vertical flow wetland treatment system according to the different ways of system water distribution or water flow in the system, and now has the following disadvantages: (1) Surface flow wetland is a rectangular structure in which sewage flows through the surface of the wetland. It has a simple structure and low cost. However, due to the overflow of sewage on the surface of the filler, it is easy to breed mosquitoes and flies, which will have adverse effects on the surrounding environment, and its treatment efficiency is relatively low. Low. The source of oxygen in the surface flow constructed wetland mainly depends on the surface diffusion of water body, the transmission of plant roots and the photosynthesis of plants, and the transmission capacity is very limited. (2) Insufficient oxygen supply and poor nitrification in subsurface wetlands. (3) The vertical flow wetland has insufficient treatment capacity for organic matter in sewage, and the control is relatively complicated, and there is a phenomenon of breeding mosquitoes and flies in summer. Moreover, the designed water quality required by traditional constructed wetlands is low, and the ability to treat domestic sewage with high concentrations of pollutants is weak, and such wetlands in cities are too abrupt and not ornamental.

Contents of the invention

In order to solve the technical problems in the known technology, the present invention provides a circular landscape water purification artificial wetland system using ecological concrete.

The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a circular landscape water purification artificial wetland system using ecological concrete, including a water distribution system, and a circular base for seepage prevention. The base is provided with a circular sump and a multi-layer ring-shaped ecological concrete wall located outside the sump; the multi-layer ring-shaped ecological concrete wall is concentric and decreases in height from outside to inside; the adjacent two-layer ring-shaped ecological concrete wall There is a mixed packing layer between them; the outer surface of the outermost ring-shaped ecological concrete wall is laid with an anti-seepage layer; the water distribution pipeline of the water distribution system is laid along the top of the outermost ring-shaped ecological concrete wall.

Further, the height difference between two adjacent layers of the ring-shaped ecological concrete wall is 300-1500 mm.

Further, the circular ecological concrete wall is made of ecological concrete blocks.

Further, the water distribution pipeline has 6-12 water distribution ports evenly distributed along the circumferential direction of the ring.

Further, the mixed packing layer includes a green zeolite packing layer, a volcanic rock packing layer and a cinder packing layer.

Further, the thickness of the green zeolite filler layer, the volcanic rock filler layer and the cinder filler layer is the same.

Further, a planting soil layer is provided on the top of the mixed packing layer; the upper surface of the planting soil layer is approximately parallel or approximately flush with the tops of the ring-shaped ecological concrete walls on both sides.

Further, the minimum thickness of the planting soil layer is 100mm.

Further, a circular pool is provided on the upper part of the sump.

Further, a fountain is provided in the pool, and the fountain is supplied with water by a lift pump provided in the sump.

The advantages and positive effects that the present invention has are:

1. The present invention forms a ladder-type subsurface flow wetland by multi-layer ring-shaped ecological concrete walls with decreasing heights. Plants such as reeds, cattails, and quinces can be planted on the wetlands. These plants have a good interception effect on nitrogen and phosphorus, and can effectively intercept landscape water. nitrogen and phosphorus, reducing the concentration of nitrogen and phosphorus in the effluent.

2. The water body from the pretreatment system flows evenly into the ecological concrete layer formed by the mixed filler layer and the annular ecological concrete wall of the present invention through the pipeline of the water distribution system. Because the mixed filler layer and the annular ecological concrete wall have the characteristics of large pores, the The water flow can flow freely in the state of horizontal flow, vertical flow, subsurface flow or even oblique flow, and fully pass through various packing layers.

3. Compared with ordinary concrete, in addition to its supporting function, the ring-shaped ecological concrete wall also has the advantages of large porosity, good water permeability, easy microbial film formation, adsorption of pollutants such as nitrogen and phosphorus, and low alkalinity. It is suitable for in the water purification system.

4. The surface of ecological concrete, green zeolite, volcanic rock and cinder is easy to form and grow biofilm, which can be used as a biological carrier. The synergistic effect of bacteria on the surface of the biofilm and plants on the surface of the stepped wetland is used to intercept nitrogen and phosphorus in the water body. In addition, green zeolite itself has a good interception effect on ammonia nitrogen, volcanic rock and cinder have a high removal efficiency on phosphorus, and ecological concrete has a certain removal effect on both.

5. The pretreatment system not only removes the suspended matter in the water body and prevents the blockage of the mixed packing layer, but also effectively slows down the flow rate of the water body to ensure the purification effect of the water purification treatment system during the rainfall or river flood season.

6. The water collection tank not only has the effect of water storage, but also makes the suspended matter in the water body continue to settle after being removed by the stepped wetland.

7. The ornamental system adopts fountains, ornamental plants, fish, etc., and cooperates with the surrounding wetland plants, which has a good landscape effect and can verify the quality of the wetland effluent.

Description of drawings

Fig. 1 is a top view of the present invention;

Fig. 2 is a cross-sectional view of the present invention.

In the figure: 1-pretreatment system, 2-water distribution system, 3-ecological concrete wall, 4-mixed filler layer, 5-planting soil layer, 6-water pool, 7-fountain, 8-lift pump, 9-water collection tank , 10-thousands of vegetables, 11-cattails, 12-reeds, 13-river, 14-drainage pipe.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figures 1 to 2, a circular landscape water purification constructed wetland system using ecological concrete, including a pretreatment system 1 and a water distribution system 2 connected thereto, and also includes a circular base for anti-seepage, said The base is provided with a circular sump 9 and a multi-layer annular ecological concrete wall 3 positioned outside the sump 9; the multi-layer annular ecological concrete wall 3 is concentric and decreases in height from outside to inside; A mixed packing layer 4 is arranged between the ring-shaped ecological concrete walls 3; the outer surface of the ring-shaped ecological concrete wall 3 in the outermost layer is laid with an anti-seepage layer; The top of the circular ecological concrete wall 3 is laid.

The pretreatment system 1 can use existing technologies, such as filter screens, etc., to remove larger suspended substances in the water.

A stepped subsurface flow wetland is formed by multi-layer ring-shaped ecological concrete walls with decreasing heights, on which plants such as reeds, cattails, and quinces can be planted.

Circular bases can be paved with materials that prevent water seepage such as clay as an anti-seepage layer, and the outer surface of the outermost annular ecological concrete wall 3 can also be paved with materials that prevent water seepage such as clay as an anti-seepage layer.

The annular ecological concrete wall 3 can be made of ecological concrete blocks. It can also be formed by connecting multiple arc-shaped panels through prefabricated panels.

The water distribution pipeline may have a plurality of inward water distribution ports evenly distributed along the circumferential direction of the ring. The water distribution pipeline can be evenly distributed with 6-12 water distribution ports along the circumferential direction of the ring.

The water to be purified flows into the pretreatment system 1 through the pipeline. The main purpose of the pretreatment system 1 is to remove the large suspended matter in the water, which can prevent the clogging of the artificial filler medium; after being treated by the facilities of the pretreatment system 1, the water flows through the ring Uniform water distribution pipelines flow out from 6-12 water outlets at the top of the outermost ecological concrete wall 3, openings are opened at regular intervals on the circular pipeline, the entire wetland is a stepped wetland, and water distribution pipes are set on the outermost side of the wetland To ensure that the water flow can evenly flow into the stepped subsurface flow wetland.

The mixed packing layer 4 may include a green zeolite packing layer, a volcanic rock packing layer and a cinder packing layer. Because green zeolite, volcanic rock and cinder have strong adsorption effects on ammonia nitrogen and phosphorus respectively, in addition, some microorganisms can be effectively attached to the surface of green zeolite, volcanic rock and cinder, and the main purpose is to cooperate with plants to effectively remove eutrophication in water Elements, different groups of the three types of fillers, can pass through the three types of fillers in a variety of water flow modes; the thickness of the green zeolite filler layer, the volcanic rock filler layer and the cinder filler layer can be the same. The thickness ratios of the green zeolite filler layer, the volcanic rock filler layer and the cinder filler layer can also be determined according to the contents of ammonia nitrogen and phosphorus in the water body.

Further, in order to facilitate the adjustment of the residence time of the water flow between the layers, the height difference between the two adjacent layers of the annular ecological concrete wall may be 300-1500 mm.

Further, a planting soil layer 5 may be provided on the mixed filler layer 4; the upper surface of the planting soil layer 5 may be approximately parallel or approximately flush with the top lines of the annular ecological concrete walls on both sides thereof. The minimum thickness of the planting soil layer 5 can be 100mm.

The water flowing out from the outlet of the water distribution pipeline of the water distribution system 2 has two flow modes, from the surface layer of the annular ecological concrete wall 3 to the surface of the mixed filler layer 4 inside the wall and the surface layer of the plant area above the mixed filler layer 4, or Seep vertically along the ring-shaped ecological concrete wall 3 and flow vertically inside the ecological concrete. The water flowing to the surface of the mixed packing layer 4 has two flow modes, one is to flow to the inner annular ecological concrete wall 3, the other is to infiltrate along the mixed packing layer 4, and flow vertically inside the mixed packing layer 4, and so on , the water flow finally converges to the bottom, and passes through the underflow to the circular sump 9 . The mixed filler layer 4 can be laid with the mixed filler of green zeolite, volcanic rock and cinder, the mixed filler layer 4 can be the planting soil layer 5, and the planting soil layer 5 can plant reed 12, cattail 11, and cinder 10, because these plants are resistant to Strong pollution ability, comprehensive absorption and enrichment ability of N, P and other nutrient elements in sewage, the main purpose is to remove eutrophic elements in water.

After the water infiltrating from the ecological concrete collects to the bottom, it will flow horizontally through the mixed filler layer 4 and the inner circular ecological concrete wall 3, and finally enter the water collection tank 9; the circular base of the wetland and the outermost circular ecological concrete wall The outer surface of 3 can be paved with a clay layer as an anti-seepage layer, the main purpose is to prevent the infiltration of water flow; the water treated by the stepped wetland system flows into the sump 9, and the main purpose of the sump 9 is to store water ; As the liquid level rises gradually, it will flow out along the drain pipe 14 after reaching the limit value.

Further, a circular pool 6 may be provided on the upper part of the sump 9 . A fountain 7 may be provided in the circular pool 6 , and the fountain 7 may be supplied with water by a lift pump 8 arranged in the sump 9 .

The lift pump 8 in the sump 9 supplies the purified water to the pool 6 through the fountain 7, and some fish and ornamental plants are cultivated in the pool 6, which can be used to verify the treated water quality of the wetland and has a good ornamental effect.

The present invention can be divided into three systems:

(1) Water purification system: mainly composed of pretreatment system 1, herbaceous plants planted on the surface of the wetland, multi-layer annular ecological concrete wall 3, between the multi-layer annular ecological concrete wall 3 and between the pool 6 and the ecological concrete wall 3 Mix filler layer 4.

(2) Water distribution system 2: including water collection pipelines, uniform water distribution pipelines, central water lifting pipelines, sewage lifting pumps and other pipelines and equipment.

(3) Ornamental system: including fountains 7, ponds, ornamental aquatic plants, etc.

Below is a preferred embodiment of the present invention and its working principle:

A circular landscape water purification artificial wetland system using ecological concrete. Next to a small landscape river 13 in the city, the base of the wetland is circular, and the base is paved with clay to prevent the seepage of the water body. Sink 9 and the multi-layer annular ecological concrete wall 3 positioned at the outside of the circular sump 9; the multi-layer annular ecological concrete wall 3 is concentric and decreases in height from outside to inside; adjacent two-layer annular ecological concrete wall 3 is provided with Mixed filler layer 4; the outer surface of the outermost annular ecological concrete wall 3 is laid with a clay anti-seepage layer; the water distribution pipeline of the water distribution system 2 is laid along the top of the outermost annular ecological concrete wall 3 .

The thickness of the ecological concrete wall 3 is 30cm, and the heights are 3m, 2.7m, 2.4m and 0.9m respectively. The upper part of the filling layer is the planting soil layer 5, which is a slope with a high outside and a low inside, with a thickness of 40cm-10cm. The planting spacing on the wetland is 10cm/plant. Green zeolite, volcanic rock and cinder The three packing layers have the same thickness, and the thicknesses of each packing layer in the three regions are about 86cm, 76cm, and 66cm, respectively.

The diameter of the water inlet pipeline in the water distribution system 2 is 15-20cm, the diameter of the annular water distribution pipeline is 10cm, and a water distribution outlet is set at every 45° angle.

The diameter of the pool 6 above the circular sump 9 is about 4m, about 1.2m deep. The pipe diameter of the fountain 7 is 5-10cm, and the sump 9 is provided with a drainage pipe 14 communicating with the landscape river 13. The diameter of the drainage pipe 14 is 15-20cm, and the height limit of the input port of the drainage pipe 14 is about 50cm.

After the river water passes through the grille, it enters the pretreatment system 1 through the pipeline, which initially intercepts the suspended matter in the water, and effectively slows down the flow rate of the water body, ensuring the purification effect of the stepped wetland purification treatment system.

When the water level of the pretreatment system 1 reaches a certain height, it flows in evenly from all around through the pipeline of the annular water distribution system 2, and flows into the stepped wetland in sequence. The landscape water flows into the stepped wetland system through runoff and infiltration. 12. Aquatic plants such as cattail 11 and chrysanthemum 10, under the synergy of ecological concrete and green zeolite, volcanic rock and cinder mixed filler layer 4, can effectively remove eutrophic elements such as N and P in the water body, wherein the ecological concrete wall 3 can be 30cm long , 20cm wide and 20cm high ecological concrete blocks, the filler particle size of the green zeolite, volcanic rock and cinder in the mixed filler layer 4 is 2-3cm, the internal pores of the ecological concrete and the surface of the green zeolite, volcanic rock and cinder adhere to microorganisms, ecological The main effect of the concrete and mixed filler layer 4 is to remove phosphorus in the water body and convert ammonia nitrogen in the water into nitrate substances for plant growth. The bottom anaerobic zone mainly converts nitrate into nitrogen to remove nitrogen in the water.

After being treated by the circular stepped wetland system, the water passes through the innermost ecological concrete wall 3 and flows into the sump 9 to slow down the water flow, so that the suspended matter remaining in the water after being removed by the circular stepped wetland system continues to settle.

After the water level of the sump 9 has not passed the lift pump 8, the lift pump 8 lifts the water in the sump 9, and enters the circular pool 6 in the center through the fountain 7 facilities, where ornamental plants such as lotus are planted in the pool 6 and ornamental fish are cultivated. kind.

When the water level of the sump 9 reaches a certain height, the water flows into the river through the drain pipe 14, which also realizes the recycling of water resources. The present invention is a circular landscape water purification artificial wetland system using ecological concrete, which can significantly remove nitrogen and phosphorus in the water body through the synergistic effect of multiple plants and filler layers, and its pretreatment system 1 increases the hydraulic retention time , to ensure a sufficient biological reaction between the various treatments, the wetland system has not only achieved remarkable results in redox and microbial degradation, but also made significant progress in ornamental aspects. Compared with the water quality of the original landscape channel 13, the interception and removal rate of nitrogen and phosphorus in the circular wetland system can be increased by more than 15%.

The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The present invention cannot be limited only by this embodiment. The scope of the patent, that is, all equivalent changes or modifications made to the spirit disclosed in the present invention still fall within the scope of the patent of the present invention.

Claims (10)

1. A circular landscape water purification artificial wetland system utilizing ecological concrete, including a water distribution system, is characterized in that it also includes a circular base for anti-seepage, the base is provided with a circular sump and is located in the collection The multi-layer annular ecological concrete wall on the outside of the tank; the multi-layer annular ecological concrete wall is concentric and decreases in height from the outside to the inside; a mixed filler layer is arranged between the adjacent two layers of the annular ecological concrete wall; the outermost layer The outer surface of the annular ecological concrete wall is laid with an anti-seepage layer; the water distribution pipeline of the water distribution system is laid along the top of the outermost annular ecological concrete wall. 2. The circular landscape water purification artificial wetland system using ecological concrete according to claim 1, characterized in that the height difference between the two adjacent layers of the circular ecological concrete wall is 300-1500mm. 3. The circular landscape water purification artificial wetland system using ecological concrete according to claim 1, wherein the circular ecological concrete wall is made of ecological concrete blocks. 4 . The circular landscape water purification artificial wetland system using ecological concrete according to claim 1 , characterized in that 6-12 water distribution outlets are evenly distributed along the circular circumferential direction of the water distribution pipeline. 5 . The circular landscape water purification constructed wetland system utilizing ecological concrete according to claim 1 , wherein the mixed filler layer comprises a green zeolite filler layer, a volcanic rock filler layer and a cinder filler layer. 6 . The ring-shaped landscape water purification constructed wetland system using ecological concrete according to claim 5 , wherein the green zeolite filler layer, the volcanic rock filler layer and the cinder filler layer have the same thickness. 7. The ring-shaped landscape water purification artificial wetland system utilizing ecological concrete according to claim 1, is characterized in that, the top of the mixed packing layer is provided with a planting soil layer; the upper surface of the planting soil layer and the The top lines of the ring-shaped ecological concrete wall are approximately parallel or approximately flush. 8. The circular landscape water purification artificial wetland system using ecological concrete according to claim 7, wherein the minimum thickness of the planting soil layer is 100 mm. 9. The circular landscape water purification artificial wetland system using ecological concrete according to claim 1, wherein a circular pool is arranged on the upper part of the water collection tank. 10. The circular landscape water purification artificial wetland system utilizing ecological concrete according to claim 9, wherein a fountain is provided in the pool, and the fountain is supplied with water by a lift pump provided in the sump.