CN220976713U

CN220976713U - Quick wetland system of biochemical

Info

Publication number: CN220976713U
Application number: CN202322808804.1U
Authority: CN
Inventors: 刘淑杰; 陈福明; 李贇; 王思琦; 彭嘉锐
Original assignee: Guangdong Qingyan Environmental Technology Co ltd
Current assignee: Guangdong Qingyan Environmental Technology Co ltd
Priority date: 2023-10-19
Filing date: 2023-10-19
Publication date: 2024-05-17
Anticipated expiration: 2033-10-19

Abstract

The utility model discloses a rapid-generation wetland system, and relates to the technical field of sewage treatment. A rapid wetland system comprises a pretreatment module, a rapid biochemical module and a deep treatment module which are connected in sequence; the pretreatment module comprises a sand setting tank, and/or a hydrolytic acidification tank, and/or a stabilization pond; the rapid biochemical module is a rapid biochemical biological film reaction tank; the advanced treatment module is a single-stage constructed wetland or is composed of more than two stages of constructed wetlands. The rapid-growth wetland system provided by the utility model can be suitable for low-pollution water treatment, and the functional microorganism abundance of the rapid-growth wetland system is effectively enhanced by a biological film technology, so that the removal efficiency of organic matters and nitrogen and phosphorus pollutants in sewage is improved, the problem that the traditional wetland system is easy to block is solved, and the occupied area, the operation and maintenance difficulty and the cost are reduced compared with the traditional constructed wetland.

Description

Quick wetland system of biochemical

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a rapid-generation wetland system.

Background

The low-pollution water body refers to a water body with main pollutant concentration exceeding the standard limit value of the surface IV water quality and not higher than the secondary standard limit value of town sewage discharge, and mainly originates from tail water of sewage treatment plants, town surface runoff and rural domestic sewage. At present, the low-pollution water body has the characteristics of wide pollution range, large total discharge amount, large fluctuation of water quality and water quantity, low carbon nitrogen ratio, poor biodegradability and the like, so that the development of a sewage treatment technology which can effectively operate for a long time and has low operation and maintenance cost is urgently needed to remove pollutants of the low-pollution water body, improve the water quality of the low-pollution water body, improve the water body environmental quality and improve the water body ecological function.

In recent years, the constructed wetland is widely applied to the treatment of low-pollution water body due to the advantages of good treatment effect, simple structure, lower investment cost and extremely ecological landscape effect. The constructed wetland mainly purifies polluted water bodies through physical, chemical and biological synergistic effects among matrixes, plants and microorganisms, and can be generally divided into three types of surface flow constructed wetland, horizontal subsurface flow constructed wetland and vertical subsurface flow constructed wetland.

However, the conventional single constructed wetland at present has a plurality of defects: firstly, the hydraulic retention time is long, and the land occupation area is large; secondly, the impact load resistance is weak, the phenomenon of matrix blockage easily occurs when the device is operated for a long time, and the quality of the effluent is unstable; thirdly, the microbial biomass attached to the substrate is limited, so that the improvement of the pollutant removal efficiency is limited; fourthly, the content of dissolved oxygen is low, the nitrification of microorganisms is inhibited, and the denitrification efficiency is affected. These defects seriously affect the treatment effect and the service life of the constructed wetland, increase the operation cost and the maintenance difficulty, and prevent the constructed wetland from being popularized and applied in actual engineering.

Therefore, development of an artificial wetland system for low-pollution water treatment, which can realize high-efficiency removal of organic matters and nitrogen and phosphorus pollutants by long-term stable operation, and has simple operation and maintenance management and small occupied area, is needed.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides the rapid-growth wetland system, which is applicable to low-pollution water treatment, effectively enhances the functional microorganism abundance of the rapid-growth wetland system through a biological film technology, further improves the removal efficiency of organic matters and nitrogen and phosphorus pollutants in sewage, simultaneously improves the problem that the wetland system is easy to block, and reduces the occupied area, the operation and maintenance difficulty and the cost compared with the traditional constructed wetland.

Specifically, the utility model discloses a rapid biochemical wetland system which comprises a pretreatment module, a rapid biochemical module and a deep treatment module which are connected in sequence; the pretreatment module comprises a sand setting tank, and/or a hydrolytic acidification tank, and/or a stabilization pond; the rapid biochemical module is a rapid biochemical biological film reaction tank; the advanced treatment module is a single-stage constructed wetland or is composed of more than two stages of constructed wetlands.

The pretreatment module comprises a grit chamber for removing sand grains and Suspended Substances (SS) in sewage aiming at turbid water bodies with more granular impurities, so that abrasion and blockage of subsequent sewage treatment equipment caused by large-particle substances in the sewage are avoided; aiming at industrial tail water of a sewage treatment plant, the pretreatment module comprises a hydrolysis acidification tank, which is used for improving the biodegradability of sewage, converting high molecular organic matters into small molecular compounds and reducing the difficulty of subsequent sewage treatment; aiming at the water body with larger fluctuation of water quality and water quantity, the pretreatment module comprises a stabilization pond, on one hand, the water quality and water quantity of sewage can be adjusted, the impact load of subsequent sewage treatment facilities is reduced, and on the other hand, a small amount of pollutants in the sewage can be removed through the natural biological purification effect of the stabilization pond.

Preferably, the rapid biochemical biological film reaction tank is a single modularized sewage treatment device or is composed of more than two modularized sewage treatment devices.

Preferably, the modularized sewage treatment device comprises an aquatic plant landscape unit and a biological film treatment unit; the aquatic plant landscape unit is arranged above the biological film treatment unit. Further, the aquatic plant landscape unit is internally provided with the aquatic plant for removing phosphorus and is used for absorbing phosphorus in sewage.

Preferably, the biofilm treatment unit comprises a three-dimensional immobilized biological curtain; the three-dimensional immobilized biological curtain is made of biological filler. Meanwhile, the biomembrane processing unit is further added with a microbial agent, the microbial agent is preferably a functional flora which is oriented and domesticated for COD and NH ₄ ⁺ -N, the specific functional microbial flora can be enriched, and the synchronous removal of C, N, P in sewage is realized by combining the dephosphorized aquatic plants, so that the pollution load removal rate is more than 80%.

Preferably, in the three-dimensional immobilized biological curtain, the interval between the biological fillers is 10-50mm. The channels reserved between the fillers can enable sewage and microorganisms to be fully mixed, and the blockage is not easy to occur.

Further preferably, in the three-dimensional immobilized biological curtain, the thickness of the biological filler is 2-5mm, and the filling rate of the biological filler is 30-70%.

Preferably, the aquatic plant landscape unit is provided with a floating plate for providing buoyancy for the aquatic plant landscape unit, and emergent aquatic landscape plants such as reed, calamus and flowers can be planted on the floating plate.

Preferably, the modularized sewage treatment device further comprises an aeration unit, and the aeration unit is arranged below the biological membrane treatment unit. The aeration unit has an auxiliary effect, and can increase the content of dissolved oxygen and strengthen the mass transfer efficiency.

Preferably, the aeration unit comprises an aeration device, an aeration pipeline and an aeration air pump; the aeration air pump is arranged on the aeration pipeline and is connected with the aeration device through the aeration pipeline.

The constructed wetland can be selected from one of a vertical subsurface flow constructed wetland, a surface flow constructed wetland and a horizontal subsurface flow constructed wetland; preferably, the advanced treatment module is formed by combining two stages of artificial wetlands, specifically, two stages of single artificial wetlands are sequentially connected in series, and the single artificial wetland has a ladder structure from high to low. Still more preferably, the two-stage single constructed wetland is a vertical subsurface flow constructed wetland and a surface flow constructed wetland which are connected in front-back manner.

Wherein, the artificial wetland combined matrix can be composed of soil, coarse sand, gravel, broken stone, zeolite, cinder, fly ash, scrap iron, steel slag and the like. The artificial wetland can be planted with submerged or emergent aquatic plants. Such as at least one of submerged plants of Sophora alopecuroides, sargassum armpit, sargassum nigrum, and Goldfish, and at least one of emergent plants of Cannabis sativa, graptopetalum album, and Acorus tatarinus.

The rapid biochemical wetland system of the utility model firstly discharges sewage into the pretreatment module, the sewage can respectively achieve the purposes of removing larger particulate impurities, improving the biodegradability of the sewage and adjusting the water quantity through the corresponding pretreatment system (a grit chamber, a hydrolytic acidification tank and a stabilization pond), then the sewage enters the rapid biochemical module to complete the removal of most C, N, P pollutants through the function of a functional microorganism reinforced biological film, finally the sewage enters the advanced treatment module to further degrade COD through the triple synergistic effect of artificial wetland plants-matrixes-microorganisms, the nitrification and denitrification of NH ₄ ⁺ -N and the adsorption removal of TP are promoted, the final yielding water is ensured to reach the standard, and meanwhile, the artificial wetland system can provide unique natural environment for cities, is convenient for people to relax and perform outdoor activities and has ecological landscape effect.

The rapid-generation wetland system provided by the utility model can realize the efficient removal effect of organic matters and nitrogen and phosphorus pollutants, solves the problem that the traditional constructed wetland is easy to block, prolongs the service life of the wetland system, and reduces the occupied area and the operation management cost.

Compared with independent single constructed wetlands and traditional combined constructed wetlands of different types, the multifunctional rapid-growth wetland system is stronger in impact load resistance and difficult to block, and can stably operate for a long time due to the fact that the rapid-growth wetland system is faster in removal rate of COD, SS, TP, NH ₄ ⁺ -N and other pollutant indexes in sewage. Compared with the traditional constructed wetland system, the rapid-growth wetland system can save more than 50 percent of land.

The rapid biochemical biological membrane reaction tank is arranged in front of the constructed wetland of the advanced treatment module, and utilizes the immobilized biological membrane technology to promote rapid biochemical degradation of pollutants in the sewage, so that the content of organic matters and pollution load entering the constructed wetland are effectively reduced, and meanwhile, the capability of the rapid biochemical wetland system for removing the pollutants is enhanced through artificial enhanced aeration, so that the rapid biochemical wetland system can solve the problems that the traditional constructed wetland system is easy to block and occupies a large area.

Compared with the existing aerobic biological treatment (such as a biological filter and an A/O process, and the like), the rapid biochemical biological film reaction tank has the advantages of high microorganism abundance, good biochemical effect, simple operation and maintenance, modularized equipment and short construction period.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a fast-growing wetland system according to embodiment 1 of the utility model;

fig. 2 is a specific schematic diagram of a fast-growing wetland system according to embodiment 1 of the present utility model;

FIG. 3 is a schematic diagram of a T-Bi c biological purification tank of example 1 of the present utility model.

The figure identifies the description:

1-a sand setting tank; 11-separation zone; 12-a bottom sand removal zone;

2-T-BI c biological purifying tank; a 20-T-Bi c module; 201-an aquatic plant landscape unit; 202-a biofilm treatment unit; 203 an aeration unit; a-an aeration device; b-an aeration pipeline; c-an aeration air pump; d-a power supply device;

3-vertical flow constructed wetland; 31-a first matrix layer; 32-submerged plants;

4-surface flow artificial wetland; 41-a second matrix layer; 42-emergent aquatic plants.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in the following embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, or that the inventive product is conventionally put in place when used, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "substantially," "essentially," and the like, are intended to be limited to the precise form disclosed herein and are not necessarily intended to be limiting. For example: the term "substantially equal" does not merely mean absolute equal, but is difficult to achieve absolute equal during actual production and operation, and generally has a certain deviation. Thus, in addition to absolute equality, "approximately equal to" includes the above-described case where there is a certain deviation. In other cases, the terms "substantially", "essentially" and the like are used in a similar manner to those described above unless otherwise indicated.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the case of example 1,

As shown in fig. 1 and 2, a fast-growing wetland system is suitable for low-pollution water treatment; the device comprises a pretreatment module, a rapid biochemical module and a deep treatment module, wherein the three functional modules are sequentially connected.

The pretreatment module is a grit chamber 1; the rapid biochemical module is a rapid biochemical biological film reaction tank, namely a Three-dimensional immobilized biological curtain (Three-d imens i ona l B i o l ogi ca l Immob i l i zed Curta i n, T-Bi c for short) biological purification tank 2; the advanced treatment module consists of a vertical subsurface flow constructed wetland 3 and a surface flow constructed wetland 4, and the two-stage constructed wetland has a stepped structure with high and low levels.

The grit chamber 1 is provided with a separation area 11 and a bottom discharge area 12. The sewage enters the grit chamber 1 from the water inlet, sand grains and larger suspended particles in the sewage are removed through gravity sedimentation in the separation area 11, the settled impurity particles are concentrated in the bottom sand discharge area 12 and are discharged periodically, and the supernatant fluid flows to the T-Bi c biological purification tank 2 through the water outlet.

The T-Bi c biological purification tank 2 is composed of a single or a plurality of modularized sewage treatment devices (T-Bi c modules 20). The T-bi c module 20 has baffles mounted on each of its four sides and is sized 1.0m x 1.0m (length x width x height). As shown in fig. 3, the T-Bi c module 20 is divided into an aquatic plant landscape unit 201, a biofilm treatment unit 202, and an aeration unit 203 in this order from top to bottom.

Wherein, the aquatic plant landscape unit 201 is provided with a plastic floating plate which can provide buoyancy for the unit module, and emergent aquatic landscape plants such as reed, calamus and flowers are planted on the floating plate. The aquatic plant landscape unit 201 can not only build ecological landscape, but also absorb and assimilate part C, N, P of pollutants in sewage through plant root systems, and has the function of purifying water quality and ecological landscape effect.

The biofilm treatment unit 202 comprises a biological filler and a microbial agent. The biological filler is flexible porous and strip-shaped or rope-shaped filler easy for biological adhesion, the biological filler is processed into a three-dimensional immobilized biological curtain which is suspended in a T-BI c module 20, such as polyester fiber and the like, the thickness of the biological filler is 5mm, the distance and the filling rate of the biological filler are flexibly adjusted according to different treated water quality, the distance of the biological filler is 10-50mm, and the filling rate is 30-70%.

The microbial agent is a functional flora which is directionally domesticated aiming at COD and NH ₄ ⁺ -N. The biofilm treatment unit 202 has the beneficial effects that the biological filler can efficiently and stably entrap functional flora on the surface of the biofilm treatment unit to form a biofilm, so that the abundance of the microbial flora is greatly enhanced, and the C, N, P pollutants in sewage are efficiently removed.

Wherein, as shown in fig. 3, the aeration unit 203 comprises an aeration device a, an aeration pipe b, an aeration air pump c and a power supply device d. The aeration device a can adopt an aeration disc, a bubble stone, a tubular aerator and the like, and the aeration disc is arranged at the bottom of the module to be used as the aeration device a in the embodiment. Particularly, the aeration air pump c of the embodiment is formed by converting solar energy into electric power to supply power, is arranged on an aeration pipeline b, is connected with an aeration device a through a connection aeration pipeline b, and supplements air and oxygenates the T-Bi c biological purification tank 2; i.e. the power supply device d is a solar power supply. The vertical circulation can be formed between the biological filler and the baffle plates around the modules through the artificial enhanced aeration, so that the concentration of dissolved oxygen and the mass transfer efficiency are effectively improved, and the rapid degradation of COD and the nitrification of NH ₄ ⁺ -N are promoted.

The T-Bi c biological purification tank 2 can realize the rapid biochemical treatment of sewage through the combined action of enhanced aeration, immobilized biological membranes and aquatic plants, and can rapidly and efficiently remove pollutants such as COD, NH ₄ ⁺ -N, TP and the like in the sewage, thereby achieving a pollution load removal rate of more than 80 percent. The sewage after biochemical treatment in the T-Bi c biological purification tank 2 directly enters the vertical subsurface flow constructed wetland 3 and the surface flow constructed wetland 4 for advanced pollutant treatment.

The water flow direction of the vertical subsurface flow constructed wetland 3 is downward flow from top to bottom, a water inlet is arranged above one side of the vertical subsurface flow constructed wetland 3, a water outlet is arranged below the other side of the vertical subsurface flow constructed wetland, and the water outlet is communicated with the surface flow constructed wetland 4.

The first substrate layer 31 of the vertical subsurface flow constructed wetland 3 is respectively a soil layer, a scrap iron and fly ash mixed layer and a gravel layer from top to bottom. Wherein, iron fillings and fly ash have good dephosphorization effect, and the mass ratio of iron fillings and fly ash in the iron fillings fly ash mixed layer is controlled as 2:1, the size of the gravel is 2-3cm. The first substrate layer 31 is mixed with submerged plants 32, and the submerged plants 32 are herba Sonchi Oleracei and Goldfish algae.

The second matrix layer 41 of the surface flow constructed wetland 4 is respectively soil and gravel from top to bottom, and the size of the gravel is 2-3cm. Emergent aquatic plants 42 are planted on the second substrate layer 41 in a mixed mode, and the emergent plants 42 adopt canna and rhizoma acori graminei with good phosphorus removal effect.

The sewage enters the vertical subsurface flow constructed wetland 3, the roots of the submerged plants 32 can assimilate and absorb pollutants and release oxygen into the water, meanwhile, the T-Bic biological purification tank 2 artificially enhanced aeration also increases the content of dissolved oxygen in the water entering the vertical subsurface flow constructed wetland 3, and sufficient oxygen promotes the microbial degradation and the NH ₄ ⁺ -N nitrification of the constructed wetland. In addition, the adsorption and precipitation of the first substrate layer 31 improves the pollutant removal rate, and particularly the phosphorus in the sewage can be efficiently removed by the electrochemical, coagulation and porous adsorption of the scrap iron and fly ash mixture in the first substrate layer.

The sewage enters the surface-flow constructed wetland 4 through the vertical subsurface-flow constructed wetland 3, and pollutants in the sewage are further deeply treated through the synergistic effect of microorganisms, plants and matrixes of the surface-flow constructed wetland 4. In particular, the anoxic zone exists at the bottom of the surface flow constructed wetland 4, NO ₃ ^- -N can be removed through denitrification, and meanwhile, the emergent aquatic plants 42 have the performance of efficiently adsorbing phosphorus, so that nitrogen and phosphorus removal are synchronously realized.

The working principle of the embodiment of the utility model is as follows: the collected low-pollution water body is introduced into a sand setting tank 1 for pretreatment, and large-particle solid impurities and suspended matters in the sewage are removed through gravity sedimentation. Then the sewage enters the T-Bi c biological purification tank 2 for rapid biochemical treatment, the T-Bi c biological purification tank 2 starts the aeration unit 203, and the sewage is efficiently and rapidly removed C, N, P pollutants in the sewage in cooperation with functional flora in the biological membrane treatment unit 202. The sewage after biochemical treatment enters the vertical flow constructed wetland 3 to flow downwards, the sewage after bottom outflow enters the surface flow constructed wetland 4 to flow horizontally, and COD removal, NH ₄ ⁺ -N, nitrification and denitrification and TP removal are further completed through the functions of microorganism, plant and matrix adsorption, precipitation, chemical degradation and the like of the two-stage composite constructed wetland.

The rapid biochemical wetland system provided by the utility model is suitable for low-pollution water treatment; the pretreatment, rapid biochemical treatment and advanced treatment three-functional module can be used for realizing high-efficiency synchronous removal of organic matters and nitrogen and phosphorus pollutants in sewage, and compared with the traditional constructed wetland system, the constructed wetland system has the advantages of quick start, difficult blockage, short hydraulic retention time and small occupied area, and can stably operate for a long time.

The occupied area of the rapid biochemical wetland system of the embodiment can be set to 45000-460000m ², and compared with the traditional constructed wetland system, the occupied area is saved by 51-53%. Correspondingly, the traditional constructed wetland system achieves the same or similar water treatment effect as the embodiment, and the occupied area is 94000-95000m ².

By adopting the rapid-generation wetland system of the embodiment, the low-pollution water body firstly enters the grit chamber 1, then passes through the T-Bi c biological purification tank 2 and the vertical subsurface flow constructed wetland 3, and finally flows out of the surface flow constructed wetland 4. The sewage removal effect of the system was verified by detecting the main contaminants in the sewage twice, specifically as shown in table 1.

Wherein COD is detected by adopting a dichromate method;

NH4 ⁺ -N is detected by adopting a Nahner reagent spectrophotometry;

The SS is detected by a weight method;

TP is detected by an ammonium molybdate spectrophotometry.

TABLE 1 Water quality and contaminant removal Effect of Inlet and outlet Water of fast-growing wetland System of this example

Specifically, the floor area of the rapid biochemical wetland system of the embodiment is 45051m ², and compared with the traditional constructed wetland system, the floor area is saved by 52%. Correspondingly, the conventional constructed wetland system achieves the same or similar water treatment effect as the embodiment, and the occupied area of the conventional constructed wetland system is about 94029m ².

In the case of example 2,

A fast-growing wetland system is different from the embodiment 1 in that the pretreatment module is a hydrolytic acidification tank, anaerobic filler is added in the hydrolytic acidification tank, the filler filling ratio is about 50%, meanwhile, a stirring device is also arranged in the tank, and microorganisms (hydrolytic acidification bacteria) attached to the biological filler in the hydrolytic acidification tank can oxidatively decompose organic matters in sewage, so that the organic matters difficult to biodegrade are converted into the organic matters easy to biodegrade, and the biodegradability of the sewage is further improved, thereby being beneficial to subsequent aerobic treatment.

Specifically, sewage enters a hydrolytic acidification tank from a water inlet, organic matters (acidification) in the hydrolytic acidification tank are decomposed by hydrolysis and anaerobic microorganism oxidation, and then supernatant is discharged from an outlet periodically and flows to the T-Bi c biological purification tank 2 through a water outlet.

In the case of example 3,

A fast-growing wetland system is different from embodiment 1 in that the pretreatment module is a stabilizing pond, and the stabilizing pond can be selected from an aerobic stabilizing pond, an anaerobic stabilizing pond, a facultative stabilizing pond and the like, and is selected as an aerobic stabilizing pond.

The water in the aerobic stabilization pond is rich in various aerobic microorganisms, plankton, algae, aquatic plants and the like, and the depth is generally not more than 0.5m. Algae use sunlight to perform photosynthesis, synthesize new algae, and release free oxygen in water. The aerobic microorganisms utilize the part of oxygen to degrade organic matters, and CO ₂ generated in the action is absorbed and utilized by algae in photosynthesis. In this way, organic pollutants are degraded during the CO ₂ and O ₂ exchange process. The algae content in the aerobic stabilization pond water is high, wherein the algae SS content in the water can reach hundreds of milligrams per liter, and the algae control and cleaning are needed to be carried out regularly.

Specifically, after sewage enters a stabilization pond, the sewage is mixed with water in the pond to a certain extent, so that the water is diluted, suspended matters in the water sink to the bottom of the pond under the action of gravity, and as the pond water contains a large amount of biological secretions with flocculation, fine suspended particles of the sewage generate flocculation and sink to the bottom of the pond to form a deposition layer; meanwhile, under the aerobic condition, most organic pollutants are removed under the metabolism of heterotrophic aerobic bacteria and facultative bacteria; in the process, a plurality of plankton, algae and aquatic plants are stored in the pond, so that biological secretion with flocculation can be generated, oxygen can be supplied to the pond, and nutrient elements such as nitrogen, phosphorus and the like in the pond can be absorbed.

Sewage enters an aerobic stabilization pond from a water inlet, after flocculation and microbial degradation in the aerobic stabilization pond, supernatant is periodically discharged from an outlet, and flows to a T-Bi c biological purification tank 2 through a water outlet.

In the case of example 4,

The fast-growing wetland system is different from the embodiment 2 only in that the advanced treatment module is a single-stage constructed wetland, specifically a surface-flow constructed wetland 4, and does not comprise a vertical subsurface-flow constructed wetland 3.

Namely, the water treated by the T-BI c biological purification tank 2 flows into the surface-flow constructed wetland 4, and the T-Bi c biological purification tank 2 artificially strengthens aeration, so that the water-inflow dissolved oxygen content of the surface-flow constructed wetland 4 is increased, and sufficient oxygen promotes the microbial degradation and the NH ₄ ⁺ -N nitrification of the constructed wetland.

Compared with the embodiment 2, the system has smaller occupied area of the advanced treatment module and relatively weaker purification effect, but also has good sewage treatment effect, and is more suitable for sewage treatment projects with smaller sewage treatment capacity and smaller occupied area.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. The rapid wetland system is characterized by comprising a pretreatment module, a rapid biochemical module and a deep treatment module which are connected in sequence; the pretreatment module comprises a sand setting tank, and/or a hydrolytic acidification tank, and/or a stabilization pond; the rapid biochemical module is a rapid biochemical biological film reaction tank; the advanced treatment module is a single-stage constructed wetland or is composed of more than two stages of constructed wetlands.

2. The rapid prototyping wetland system of claim 1 wherein said rapid prototyping biological film reaction tank is a single modular wastewater treatment plant or is comprised of two or more modular wastewater treatment plants.

3. The rapid prototyping wetland system of claim 2 wherein said modular wastewater treatment unit comprises an aquatic plant landscape unit, a biofilm treatment unit; the aquatic plant landscape unit is arranged above the biological film treatment unit.

4. A rapid prototyping wetland system according to claim 3 wherein said biofilm treatment unit comprises a three-dimensional immobilized biological curtain; the three-dimensional immobilized biological curtain is made of biological filler.

5. The rapid prototyping wetland system according to claim 4, wherein the three-dimensional immobilized biological curtain has a distance between biological fillers of 10-50mm.

6. The rapid prototyping wetland system according to claim 5, wherein the thickness of the biological filler in the three-dimensional immobilization biological curtain is 2-5mm, and the filling rate of the biological filler is 30-70%.

7. The rapid prototyping wetland system of claim 6 wherein said aquatic plant landscape unit is provided with a floating plate.

8. The rapid prototyping wetland system of claim 3 wherein said modular wastewater treatment unit further comprises an aeration unit, said aeration unit being disposed below said biofilm treatment unit.

9. The rapid prototyping wetland system according to claim 8, wherein said aeration unit comprises an aeration device, an aeration pipe, and an aeration air pump; the aeration air pump is arranged on the aeration pipeline and is connected with the aeration device through the aeration pipeline.

10. The rapid prototyping wetland system of claim 1 wherein said advanced treatment module is comprised of a two-stage constructed wetland.