TWM525351U - An artificial horizontal subsurface flow wetland and anti-clogging sedimentation tank thereof - Google Patents

Description

Artificial horizontal subsurface wetland and anti-blocking sedimentation tank

The novel creation relates to the field of ecological engineering technology, and specifically relates to an artificial horizontal subsurface wetland and an anti-blocking sedimentation tank.

Constructed wetlands are composed of artificial substrates (gravel, gravel, etc.) and aquatic plants grown on them. The sewage flows under the surface or surface of the wetland matrix, relying on matrix adsorption, plant absorption, microbial transformation and other processes. Degrading nutrients in water is a unique matrix-plant-microbial system that is distinct from natural wetlands. However, due to the design idea of horizontal subsurface flow constructed wetland, the undercurrent wetland is prone to blockage; according to the US Environmental Protection Agency's survey of more than 100 constructed wetlands in operation, nearly half of the facilities are within 5 years. The problem of matrix clogging has occurred, resulting in a decrease in hydraulic conductivity, a decrease in purification effect, and a shortened operating life. In addition to the problem of occupational wetland treatment facilities, the problem of blockage of constructed wetland substrates has become the biggest obstacle to its application.

In order to deal with the problem of matrix blockage in subsurface wetlands, researchers at home and abroad have done a lot of research. In summary, there are mainly pretreatment, aeration and oxygenation, bed rotation, replacement of substrate, addition of sputum, application of microbial inhibitors, etc. .

(1) Pretreatment

Pretreatment can reduce suspended solids and organic loads in wetland waters (especially when When the content of solid matter in the organic load is large, it is effective to prevent the occurrence of blockage of artificial wetlands. Common pretreatment techniques include grids, anaerobic precipitation, coagulation sedimentation, and the like. Although these measures can effectively delay the time of matrix clogging, they can not prevent the occurrence of matrix clogging caused by dissolved organic matter, and increase the investment, operating cost and maintenance management difficulty of the system. The suitability of such a method requires a trade-off between the resulting increase in operational and personnel costs and the cost of replacing the substrate after matrix blockage.

(2) aeration and oxygenation

Since the anaerobic state is an important cause of the accumulation of extracellular polymers in the matrix, pre-aeration and oxygenation of the sewage can achieve a certain prevention of clogging. Since the DO value of the sewage will decrease rapidly during the infiltration process, the supply of air around the water pipe can effectively increase the DO concentration of the sewage, maintain the aerobic state in the matrix, maintain the decomposition of the microorganisms, and prevent the matrix. The accumulation of extracellular polymers. However, the system structure is increased, the operation is complicated, and the cost is increased, making it difficult to implement.

(3) Suspension, rotation

After the constructed wetland is blocked, it is common in foreign countries to restore the partial permeability after a few weeks of bed rest, and the length of the shift depends on the weather conditions, generally ranging from 7 days to a month. . By stopping the bed and doing the rotation, on the one hand, the oxygen in the atmosphere can enter the interior of the wetland, and the organic matter deposited in the matrix can be accelerated. On the other hand, the various nutrients required for the metabolism of the microorganism cannot be continuously supplemented. The microorganisms in the gradual phase gradually enter the endogenous respiratory phase, consuming extracellular polymers or intracellular components, and then gradually aging and dying. However, such measures require the construction of multiple parallel wetland structures, which will significantly increase the footprint and investment costs of the wetland treatment system.

(4) Replace part of the wetland substrate

The study found that the most prone to clogging is generally the upper matrix near the influent zone. Taking the horizontal subsurface wetland as an example, it usually occurs in the 1/10~1/4 segment before the length of the overflow. For this reason, the function of the constructed wetland can be effectively restored by replacing the substrate of the wetland. The disadvantage is that for large-scale wetlands, the amount of work is large, the replacement is difficult, and the artificial wetland needs to be stopped and replaced when replaced. long time. The researchers found that in the composite vertical subsurface flow wetland that has been running for 5 years, the decrease in the permeability coefficient is mainly in the downflow pool near the inlet end, and the most decline is not in the surface layer of the wetland, but at 15 to 30 cm below the surface layer. This just proves that the matrix changes from an oxidizing environment to an anaerobic environment, which is prone to blockage caused by organic matter metabolites. However, the results of this study also raise the problem. The horizontal design of the subsurface wetland is generally designed to have an effective depth of 60-80 cm. This means that if the substrate needs to be replaced to solve the clogging problem, the plant growth substrate layer with the strongest microbial activity and the most developed plant roots will be replaced. After the wetland substrate is replaced in this way, the wetland plant and the matrix microorganism will take a long time (generally considered to be at least one year or more) to re-mature to achieve recovery of the processing capacity.

Throughout the domestic and international research status, there are many factors causing the blockage of artificial wetland matrix, and there are many corresponding preventive measures and recovery strategies, but the effects are very different, and often the symptoms are not cured. In summary, organic pollutants and their metabolites are the main cause of blockage of constructed wetlands. Solid particles such as inorganic suspended solids and organic solids in the influent can be processed by low-cost pretreatment (such as grids, sedimentation tanks, flocculation). Etc.) is well resolved, but the dissolved organic matter and the metabolites of microorganisms accumulated in the matrix (including bacterial extracellular polymers, etc.) are undoubtedly difficult to use at a lower cost, or even impossible to solve, for a long time to come. In the meantime, the problem of blockage will become the focus of research on constructed wetland sewage treatment technology.

In order to solve the problem that the horizontal submerged artificial wetland is easy to block, the novel creation provides a horizontal submerged wetland and its anti-clogging sedimentation tank.

The technical means of the novel creation is as follows: an artificial horizontal submerged wetland, wherein a plurality of horizontally arranged wetland units are arranged, and an anti-blocking sedimentation tank is arranged between the wetland units; the anti-blocking sedimentation tank includes a container that can be used as a container a tank body and a water inlet and a water outlet provided on a side wall of the tank body, wherein the water inlet is located lower than the water outlet; the water inlet is for receiving sewage to be precipitated, and the water outlet is for upper and lower portions of the tank body The water is drained away.

The opposite side walls of the main body of the pool are respectively provided with through holes, and the water inlet refers to a through hole having a lower opening position on one side wall; the water outlet refers to a higher opening position on the side wall of the other side. hole.

The anti-clogging sedimentation tank further includes a bent pipe with two ends open; the opposite side walls of the main body of the tank respectively have through holes, and the water inlet refers to the opened through hole on one side wall; one end of the curved pipe The opening is a fixed end, and is closely attached to the through hole opened in the side wall of the other side, the other end of the elbow is a free end, is in the inner cavity of the pool body and upward; the water outlet refers to the elbow Free end.

A plurality of the foregoing sedimentation tanks are disposed between the two artificial wetland units.

A plurality of the aforementioned sedimentation tanks are connected by a drainage pipe.

An anti-clogging sedimentation tank for an artificial horizontal submerged wetland, comprising: a tank body which can be used as a container, and a water inlet and a water outlet provided on a side wall of the tank body, the foregoing The position of the nozzle is lower than the aforementioned water outlet;

The water inlet is for receiving the sewage to be precipitated, and the water outlet is for discharging the water in the upper part of the body of the pool.

The opposite side walls of the main body of the pool are respectively provided with through holes, and the water inlet refers to a through hole having a lower opening position on one side wall; the water outlet refers to a higher opening position on the side wall of the other side. hole.

The anti-clogging sedimentation tank further includes a bent pipe with two ends open; the opposite side walls of the main body of the tank respectively have through holes, and the water inlet refers to the opened through hole on one side wall; one end of the curved pipe The opening is a fixed end, and is closely attached to the through hole opened in the side wall of the other side, the other end of the elbow is a free end, is in the inner cavity of the pool body and upward; the water outlet refers to the elbow Free end.

The aforementioned pool body is a brick structure.

The novel creation breaks through the conventional thinking in the prior art, and provides a anti-clogging sedimentation tank applied to the horizontal submerged artificial wetland by using simple technical principles, and solves the problem that the horizontal submerged artificial wetland is easy to block.

The anti-clogging sedimentation tank provided by the novel creation is disposed between two constructed wetland units, instead of setting a sedimentation tank only before entering the artificial wetland unit as disclosed in the prior art, the effect of the setting of the novel creation is After entering the anti-clogging sedimentation tank through the sewage filtered by the matrix in the constructed wetland unit, the impurities and/or suspended substances which are easily blocked by the larger particle size in the sewage are precipitated through the sedimentation tank, so that the sewage enters the next artificial Before the wetland unit can greatly eliminate the factors causing the blockage, thereby achieving the purpose of preventing clogging. In addition, the foregoing anti-clogging sedimentation tank is further characterized in that the height of the water inlet of the foregoing sedimentation tank is lower than the height of the water outlet, and the effect thereof is After the sewage enters the sedimentation tank from the water inlet, the difference in height between the water outlet and the water inlet leaves sufficient time and space for the precipitation of impurities and/or suspended matter in the sedimentation tank, so that the sedimentation is more thorough and reduced. The water discharged from the water outlet is more likely to cause clogging of impurities and/or suspended matter before entering the next artificial wetland unit, so that the anti-blocking effect is better.

The foregoing anti-clogging sedimentation tank provided by the novel creation has the advantages of simple structure, low cost, good effect, high efficiency, convenient operation and maintenance, and long-term effective use.

1‧‧‧Anti-blocking sedimentation tank

2‧‧‧ Inlet

3‧‧‧Water outlet

4‧‧‧Bend

5‧‧‧Free end

6‧‧‧ constructed wetland unit

7‧‧‧ Constructed wetland substrate

8‧‧‧Drainage pipe

9‧‧‧Sewage

Fig. 1 is a structural schematic view showing the water inlet side of the No. 1 horizontal subsurface flow constructed wetland anti-blocking sedimentation tank described in the first embodiment of the present invention.

2 is a schematic cross-sectional structural view of the No. 1 horizontal subsurface flow constructed wetland anti-blocking sedimentation tank described in the first embodiment of the present invention.

Fig. 3 is a structural schematic view showing the water outlet side of the No. 1 horizontal subsurface flow constructed wetland anti-clogging sedimentation tank described in the first embodiment of the present invention.

Fig. 4 is a schematic view showing the structure of the anti-clogging application of the horizontal submerged artificial wetland by using the anti-clogging sedimentation tank described in the first embodiment.

Fig. 5 is a schematic cross-sectional structural view of a horizontal submerged flow constructed wetland anti-blocking sedimentation tank of the second embodiment of the present invention.

Among them, 1 series anti-blocking sedimentation tank; 2 series water inlet; 3 series water outlet; 4 series curved pipe; 5 series free end; 6 series constructed wetland unit; 7 series constructed wetland substrate; 8 series drainage pipe; Sewage.

The present invention will be further described in detail below with reference to specific embodiments, but does not limit the scope of the novel creation.

Example 1, No. 1 horizontal subsurface flow constructed wetland anti-blocking sedimentation tank

The horizontal submerged flow constructed wetland anti-blocking sedimentation tank 1 according to the present embodiment will be described in detail with reference to Figs. 1, 2 and 3. The anti-clogging sedimentation tank includes a water inlet 2 and a water outlet 3, and the height of the water inlet 2 is lower than the height of the water outlet 3, specifically, in the present embodiment, as shown in FIG. 2, the inside of the sedimentation tank 1 An elbow 4 is installed, the free end 5 of the elbow 4 is in the inner cavity of the tank body of the sedimentation tank 1 and upward, and the fixed end of the elbow 4 is closely attached to the side wall of the sedimentation tank 1 The water outlet 3 of the sedimentation tank 1 is connected to the outside of the sedimentation tank 1; the free end 5 of the elbow 4 is higher than the height of the water inlet 1; in the embodiment, the anti-clogging sedimentation tank 1 is In the quadrangular brick structure, the side wall provided with the water inlet 2 corresponds to the side wall provided with the water outlet 3. In the present embodiment, the water inlet 2 is specifically disposed two, and the water outlet 3 is also two.

The other structural parameters of the anti-clogging sedimentation tank 1 described in this embodiment are as follows: sedimentation tank 1: high 1500 cm, length and width each are 1400 cm, inlet 2 width is 200 cm; inlet 2 tip is 600 cm from the top of the sedimentation tank; The water inlets 2 are spaced 200cm apart in the horizontal direction; each water inlet 2 is 400cm away from the edge of the side wall of the sedimentation tank in the horizontal direction; the water outlet 3 is 200cm wide; the water outlet 3 is bent toward the upper end of the free end of the sedimentation tank. The top of the tank is 400 cm; the top of the fixed end of the water outlet 3 is 600 cm from the top of the sedimentation tank; the two water outlets 3 are spaced 200 cm horizontally; each water outlet 3 is 400 cm horizontally from the edge of the side wall of the sedimentation tank.

Example 2: Using the No. 1 anti-clogging sedimentation tank to prevent horizontal subsurface flow constructed wetland Blocking application

As shown in FIG. 4, the horizontal submerged artificial wetland was subjected to anti-clogging application using the No. 1 anti-clogging sedimentation tank described in Example 1. In the present embodiment, two anti-clogging sedimentation tanks 1 are disposed between the first personal wetland unit 6 and the second personal wetland unit 6, and the two sedimentation tanks 1 are connected by a drain pipe 8; One of the aforementioned anti-clogging sedimentation tanks 1 is disposed between the two personal wetland units 6 and the third personal wetland unit 6. The structure and structure of the aforementioned anti-clogging sedimentation tank 1 are as described in the first embodiment, and the water inlet height of the foregoing sedimentation tank 1 is lower than the surface of the artificial wetland substrate 7 of the artificial wetland unit 6.

According to the connection arrangement of Fig. 4, the sewage 9 is oozing from the substrate 7 of the first personal wetland unit 6 through the water inlet 2 into the sedimentation tank 1 for precipitation. Since the tip end of the bent pipe of the water outlet 3 to the upwardly bent end in the sedimentation tank is 200 cm above the top of the water inlet 2, the larger particle size of the sewage 9 is likely to cause clogging of impurities and/or suspended matter in the sedimentation tank 1 to be sufficiently long. Precipitation time, and there is enough space in the sedimentation tank to precipitate impurities and/or suspended matter. When the water surface of the sewage 9 rises to the top of the end of the curved end of the water outlet 3 which is bent upward in the sedimentation tank, after a long time The water sufficiently precipitated enters from the tip end of the bent pipe of the water outlet 3 toward the upwardly bent end in the sedimentation tank, and flows through the curved pipe of the water outlet 3 to be discharged to the drain pipe 8. Since the drain pipe 8 is connected to the other aforementioned sedimentation tank 1, the sedimentation is carried out again in the above manner, and the water is discharged into the second personal wetland unit 6. After two rounds of sedimentation in the two sedimentation tanks, the water entering the second human wetland unit 6 contains less impurities and/or suspended matter which are liable to cause clogging, thereby producing an effective anti-blocking effect. The water flowing through the second human wetland unit 6 may contain new impurities and/or suspended matter which may cause clogging, so that a sedimentation tank 1 is set when the water flows out of the second artificial wetland unit 6, and the sedimentation is performed by sedimentation. The impurities and/or suspended matter in the water which is liable to cause clogging can be effectively removed, and the water can smoothly enter the third personal wetland unit 6.

Example 3, 2 horizontal subsurface flow constructed wetland anti-blocking sedimentation tank

Referring to FIG. 1, FIG. 3 and FIG. 5, the anti-blocking sedimentation tank of the horizontal submerged artificial wetland based on the present embodiment 2 will be described in detail. The anti-clogging sedimentation tank includes a water inlet 2 and a water outlet 3, and the height of the water inlet is lower than the height of the water outlet. Specifically, in the embodiment, as shown in FIG. 2, the water outlet 3 is at the top of the water outlet. The top of the pool is 400 cm, and the tip of the aforementioned water inlet 2 is 600 cm from the top of the sedimentation tank, and the height difference between them is 200 cm in the vertical direction.

In the embodiment, the anti-clogging sedimentation tank has a square structure, and the side wall of the water inlet 2 is corresponding to the side wall provided with the water outlet 3; in the embodiment, the water inlet 2 is specifically arranged to surround two, the foregoing There are also two outlets 3.

The other structural parameters of the anti-clogging sedimentation tank described in this embodiment are as follows: sedimentation tank 1: height 1500 cm, length and width each are 1400 cm, water inlet 2 width is 200 cm; two water inlets 2 are spaced 200 cm horizontally; Each water inlet 2 is 400 cm from the edge of the side wall of the sedimentation tank in the horizontal direction; the water outlet 3 has a width of 200 cm; the two water outlets 3 are spaced apart by 200 cm in the horizontal direction; each water outlet 3 is 400 cm horizontally from the edge of the side wall of the sedimentation tank.

Example 4: Anti-clogging application of horizontal subsurface flow constructed wetland by using No. 2 anti-clogging sedimentation tank

The anti-clogging application of the horizontal submerged artificial wetland using the No. 2 anti-clogging sedimentation tank 1 described in Embodiment 3 may be provided between the two and/or the plurality of constructed wetland units. Block the sedimentation tank 1.

The sewage seeps out from the matrix of a constructed wetland unit and enters the sedimentation tank 1 through the water inlet. Since the top of the water outlet is 200 cm above the top of the water inlet, the larger particle size of the sewage easily causes clogging of impurities and/or suspended matter to precipitate. Sufficient precipitation is obtained in the tank 1 for a long time, and sufficient space is left in the sedimentation tank to precipitate impurities and/or suspended matter, when the sewage surface rises to the aforementioned water outlet 3 At the time, water that has settled sufficiently for a long time enters from the water outlet 3, and is discharged to the other constructed wetland unit or the drain pipe through the water outlet 3. After the sedimentation of the sedimentation tank 1 or the multiple rounds of sedimentation of the plurality of sedimentation tanks 1, most of the impurities and/or suspended solids in the sewage which are likely to cause clogging are removed, so that the impurities contained in the sewage entering the next artificial wetland unit and / or the amount of suspended matter is reduced, the factor causing the blockage is largely eliminated, thereby achieving the effect of preventing clogging.

The above description is only the best implementation of the novel creation. For those who are in the technical field, the improvement and retouching should be regarded as the protection of the new creation without departing from the novel creation concept. range.

1‧‧‧Anti-blocking sedimentation tank

2‧‧‧ Inlet

3‧‧‧Water outlet

4‧‧‧Bend

5‧‧‧Free end

6‧‧‧ constructed wetland unit

7‧‧‧ Constructed wetland substrate

8‧‧‧Drainage pipe

9‧‧‧Sewage

Claims (9)

An artificial horizontal submerged wetland characterized in that it comprises a plurality of horizontally arranged wetland units, and an anti-clogging sedimentation tank is arranged between the wetland units; the anti-blocking sedimentation tank comprises a tank body which can be used as a container and is provided in the foregoing The water inlet and the water outlet on the side wall of the main body of the pool, the position of the water inlet is lower than the water outlet; the water inlet is for receiving the sewage to be precipitated, and the water outlet is for discharging the water in the upper part of the body of the pool. The artificial horizontal submerged wetland as described in claim 1, wherein the opposite side walls of the main body of the pool are respectively provided with through holes, and the water inlet refers to a through hole having a lower opening position on one side wall. The aforementioned water outlet refers to a through hole having a higher opening position on the other side wall. The artificial horizontal submerged wetland as described in claim 1, wherein the anti-clogging sedimentation tank further comprises a bent pipe having two ends open; and the opposite side walls of the opposite main body of the pool body are respectively provided with through holes, The water inlet refers to a through hole opened on one side wall; one end of the curved tube is a fixed end, and is closely attached to the through hole which is installed on the other side wall, and the other end of the curved tube is a free end, The inner cavity of the pool body is in the upward direction; the water outlet is the free end of the elbow. The artificial horizontal submerged wetland as described in any one of claims 1-3, wherein a plurality of the foregoing sedimentation tanks are disposed between the two constructed wetland units. The artificial horizontal subsurface wetland as described in claim 4, wherein the plurality of sedimentation tanks are connected by a drainage pipe. An anti-blocking sedimentation tank for artificial horizontal subsurface wetland, characterized in that it comprises a tank body which can be used as a container and a water inlet and a water outlet provided on a side wall of the tank body, the water inlet The position of the mouth is lower than the aforementioned water outlet; the water inlet is for receiving the sewage to be precipitated, and the water outlet is for discharging the water in the upper part of the body of the pool. The anti-blocking sedimentation tank according to the sixth aspect of the invention, wherein the opposite sides of the opposite side of the pool body are respectively provided with through holes, and the water inlet refers to a through hole having a lower opening position on one side wall; The aforementioned water outlet refers to a through hole having a higher opening position on the other side wall. The anti-clogging sedimentation tank according to claim 6, wherein the anti-clogging sedimentation tank further comprises a curved pipe with two ends open; the opposite side walls of the main body of the tank respectively have through holes, and the water inlet is on one side wall. The through hole of the elbow; the one end of the elbow is a fixed end, and is closely attached to the through hole opened in the side wall of the other side, and the other end of the elbow is a free end, and is in the inner cavity of the pool body Medium and upward; the aforementioned water outlet refers to the free end of the aforementioned elbow. The anti-clogging sedimentation tank according to any one of claims 6 to 8, wherein the pool body is a brick structure.