CN210438573U

CN210438573U - Stifled oxygenation type constructed wetland system of inhibiting

Info

Publication number: CN210438573U
Application number: CN201920683693.7U
Authority: CN
Inventors: 潘龙; 张瑞斌; 王乐阳; 潘卓兮; 奚道国; 马振杰; 史明; 周乃
Original assignee: Jiangsu Long Leaping Engineering Design Co ltd
Current assignee: Jiangsu Long Leaping Engineering Design Co ltd
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-05-01
Anticipated expiration: 2029-05-14

Abstract

The utility model belongs to the sewage treatment field, concretely relates to restrain stifled oxygenation type constructed wetland system, include filter equipment, water spray oxygenation device, constructed wetland and the catch basin that sets gradually according to the rivers direction. The filtering device comprises a filtering tank, a baffle, a grating, a sedimentation inclined plate and a filtering layer; the baffle is arranged on the upper part of the inner wall of the filtering tank and divides the filtering tank into a primary filtering cavity and a reinforced filtering cavity; a water inlet is arranged on the primary filtering cavity; the grid is obliquely arranged in the primary filtering cavity at a position lower than the water inlet; a water outlet is arranged below the reinforced filter cavity corresponding to the horizontal position of the water inlet; the filtering layer and the sedimentation sloping plate are both arranged in the strengthened filtering cavity at a position lower than the water outlet, and the filtering layer is positioned above the sedimentation sloping plate. The utility model discloses well sewage is through filter equipment, water spray oxygenation device, constructed wetland's processing in proper order, improves the dissolved oxygen content of water among the constructed wetland greatly, alleviates the jam problem, effectively gets rid of various pollutants in the sewage.

Description

Stifled oxygenation type constructed wetland system of inhibiting

Technical Field

The utility model belongs to the sewage treatment field, concretely relates to stifled oxygenation type constructed wetland system presses down.

Background

The artificial wetland is a novel sewage treatment technology which is started in the 70 th of the 20 th century, sewage is controllably dosed to the constructed wetland, and the sewage is treated mainly by utilizing the physical, chemical and biological synergistic effects of soil, artificial media, plants and microorganisms in the process of flowing along a certain direction. The method has the characteristics of large buffer capacity, convenient management, simple process, low investment, low operating cost, high environmental benefit and the like, and is widely applied to sewage treatment in small towns and rural areas. However, it also has some problems, which limit its popularization and application, such as: the artificial wetland has low denitrification (total nitrogen) efficiency and is easy to block. Therefore, in order to promote the application of the artificial wetland, the aim of effectively improving the artificial wetland system at low cost to realize oxygenation and blockage inhibition is achieved, and the artificial wetland system is an important direction for the technical development of the artificial wetland.

When the constructed wetland is used for denitrification, nitrogen is removed mainly through the nitrification/denitrification of microorganisms in the constructed wetland, and because the natural oxygen supply capacity of the constructed wetland is difficult to meet the requirement of nitrifying bacteria for completing the nitrification reaction, the denitrification capacity of the constructed wetland is limited because the nitrification is insufficient and the ammonia nitrogen cannot be fully converted into the raw material nitrate nitrogen and nitrite nitrogen with the denitrification when the sewage with high ammonia nitrogen content is treated. In order to ensure that the oxygen content of the artificial wetland can meet the requirement of completing nitration reaction by nitrifying bacteria, the prior art generally adopts oxygen increasing treatment, such as an aeration artificial wetland disclosed in Chinese patent CN105967334A and a hydraulic oxygen increasing artificial wetland disclosed in Chinese patent CN 101885565B; although the problem of oxygen content of the artificial wetland is solved, the required cost is high, and the method can not be applied to the improvement of the existing artificial wetland technology.

The blockage is always a main influencing factor for limiting the wide application of the constructed wetland. The study suggests that wetland blockage is mainly caused by accumulation of non-filterable inorganic and organic matter, and enrichment of extracellular polymers of microorganisms. In order to reduce blockage, in the prior art, for example, a blockage inhibiting device for an artificial wetland disclosed in chinese patent CN102126791A, and a method and a system for automatically clearing the blockage of the artificial wetland on line disclosed in chinese patent CN105217795A all achieve the purpose of reducing blockage and increasing the oxygen content of the artificial wetland by an aeration and oxygenation process and by a gas impact manner. However, the purpose of the blockage-inhibiting aeration needs to be achieved at a large cost, but the effect achieved by the method is not ideal.

Besides improving the structure of the artificial wetland, the prior art also has another path for solving the blockage problem, namely controlling the water quality of sewage entering the artificial wetland and realizing the purpose of reducing the blockage of the artificial wetland caused by the accumulation of non-filterable inorganic matters and organic matters from the source. For example, the artificial wetland system disclosed in chinese patent CN104829064A comprises a grid tank, a hydrolysis acidification tank and an artificial wetland tank which are connected in sequence; a grid is arranged in the grid pool; a mud discharging hopper is arranged at the bottom of the grating pool; and a sludge discharge pipeline for discharging sludge is arranged on the wall of the grating tank. Compared with the technical scheme of blockage inhibition and oxygen increase in the prior art, the technical scheme has the advantages that the energy consumption is low, but the technical problems that the blockage of the artificial wetland is reduced through preliminary filtration and chemical decomposition, chemicals are excessively consumed in the preliminary treatment process of sewage, and the used chemicals can become secondary pollution sources; in addition, the sewage treated by the hydrolysis acidification tank can directly enter the artificial wetland tank, and products of the hydrolysis acidification tank can locally corrode the artificial wetland tank and even generate substances which can not be treated by the artificial wetland tank, so that the substances become a blocking source for blocking the artificial wetland again; furthermore, the problem of how to increase the oxygen content of the artificial wetland is not solved.

Based on this, how from the source and constructed wetland structure, it is the problem that the utility model aims to solve to alleviate constructed wetland and block up and improve constructed wetland's oxygen content.

SUMMERY OF THE UTILITY MODEL

The utility model provides a restrain stifled oxygenation type constructed wetland system, it can be from the source with constructed wetland construct realize to the effectual oxygenation of constructed wetland with restrain stifled.

In order to realize the technical purpose, the technical proposal adopted by the utility model is that the anti-blocking oxygenation type constructed wetland system comprises a filtering device, a water spray oxygenation device, an artificial wetland and a water collecting tank which are arranged in sequence according to the water flow direction;

the filtering device comprises a filtering tank, a baffle, a grating, a sedimentation inclined plate and a filtering layer; the baffle is arranged on the upper part of the inner wall of the filtering tank and divides the filtering tank into a primary filtering cavity and a reinforced filtering cavity; a water inlet is arranged on the primary filtering cavity; the grid is obliquely arranged in the primary filtering cavity at a position lower than the water inlet; a water outlet is arranged below the reinforced filter cavity corresponding to the horizontal position of the water inlet; the filter layer and the sedimentation sloping plate are both arranged in the reinforced filter cavity at a position lower than the water outlet, and the filter layer is positioned above the sedimentation sloping plate;

the water spraying and oxygen increasing device comprises a water tank, a water pipe and a spray head which are sequentially communicated, wherein the water pipe is provided with a flow regulating valve, the water inlet end of the water pipe is communicated with the water outlet through the water tank, and the water outlet end of the water pipe can be communicated with the spray head; the spray head is arranged at the water inlet end of the artificial wetland; the water collecting tank is used for collecting the sewage treated by the artificial wetland.

As the improved technical scheme of the application, the filtering device further comprises a plurality of triangular partition walls arranged at the bottom of the filtering tank, a sludge tank is formed between any two adjacent partition walls, and a sludge pump is arranged in any sludge tank.

As the improved technical scheme of the application, the filtering layer comprises at least two filtering filler layers; when the filter layer is used for a pollution source mainly containing nitrogen and phosphorus, the filter layer comprises a quartz sand layer and an adsorptive filler layer which are arranged from bottom to top, and the adsorptive filler layer comprises activated carbon or ceramsite; when the Biological Oxygen Demand (BOD) is used as a main pollution source, the filter layer comprises a quartz sand layer and a microbial agent layer which are arranged from bottom to top.

As an improved technical scheme of the application, the artificial wetland comprises a horizontal subsurface flow artificial wetland and a vertical subsurface flow artificial wetland which are arranged in series and are communicated at the bottom; the sewage collecting pipeline is arranged at the upper part of the vertical subsurface flow artificial wetland and is used for collecting sewage flowing through the horizontal subsurface flow artificial wetland and the vertical subsurface flow artificial wetland.

As the improved technical scheme of the application, the water collecting baffle is suspended in the water collecting tank and divides the water collecting tank into an inner water tank and an outer water tank, and the inner water tank is arranged at the water outlet end of the artificial wetland.

As an improved technical scheme of the application, the artificial wetland comprises a horizontal subsurface flow artificial wetland and a vertical subsurface flow artificial wetland which are arranged in series and are communicated at the bottom; the sewage collection pipeline is arranged at the upper part of the vertical subsurface flow artificial wetland and is used for collecting sewage flowing through the horizontal subsurface flow artificial wetland and the vertical subsurface flow artificial wetland; the water collecting tank is communicated with the water collecting pipeline.

As an improved technical scheme of the application, the horizontal subsurface flow constructed wetland and the vertical subsurface flow constructed wetland comprise wetland plants and substrates which are arranged from top to bottom; the horizontal subsurface flow constructed wetland substrate is sequentially composed of cobblestones, organic polymer fillers and light ceramic particles from bottom to top, the vertical subsurface flow constructed wetland substrate is sequentially composed of cobblestones, aluminum sludge composite fillers and light ceramic particles from bottom to top, and the particle size levels of the cobblestones, the aluminum sludge composite fillers and the light ceramic particles are small at the top and large at the bottom.

Compared with the prior art, the utility model discloses the advantage that possesses:

the utility model discloses a filter equipment, water spray oxygenation device and constructed wetland's cooperation has realized inhibiting stifled oxygenation's purpose, has improved constructed wetland nitrogen phosphorus, organic matter and has got rid of efficiency. The method specifically comprises the following steps: the sewage is sequentially treated by the filtering devices, so that the possibility of blockage caused by accumulation of micro particles in the artificial wetland matrix is greatly reduced, and various pollutants in the sewage can be effectively removed by the artificial wetland. The water spraying oxygen increasing device is adopted, and the dissolved oxygen content of the water body entering the artificial wetland is greatly improved on the basis of not consuming other energy sources. The organic polymer filler in the horizontal subsurface flow constructed wetland is in contact oxidation with the sewage with higher oxygen content, so that the activity of microorganisms in the wetland is greatly enhanced, the capability of the microorganisms for decomposing organic matters is greatly improved, pollutants such as nitrogen, phosphorus, suspended organic matter particles and the like are efficiently removed, and the suspended filler is not easy to block. The aluminum sludge composite filler has the functions of strengthening flocculation, efficiently removing nitrogen and phosphorus, sterilizing and maintaining the balance of the total bacteria of the filler layer.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention and are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of the various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of the constructed wetland system of the present invention;

in the figure: 1. a filtration device; 101. a water inlet; 102. a grid; 103. a sludge pump; 104. a sludge tank; 105. a sedimentation sloping plate; 106. a quartz sand layer; 107. an activated carbon layer; 108. a water outlet; 109. a baffle plate; 110. a primary filter cavity; 111. strengthening the filter cavity; 112. a partition wall;

2. a water spraying and oxygen increasing device; 201. a water tank; 202. a flow regulating valve; 203. a spray head; 204. water pipe

3. Horizontal undercurrent artificial wetland; 301. cobblestones; 302. an organic polymer filler; 303. light-weight ceramsite; 304. a plant; 305. a packing support plate;

4. a vertical subsurface flow constructed wetland; 401. cobblestones; 402. aluminum sludge composite filler; 403. light-weight ceramsite; 404. a water collection pipe; 405. a plant;

5. a water collecting tank; 501. a water outlet of the artificial wetland; 502. a water collecting baffle; 503. a sludge discharge port; 504. a sludge discharge pump.

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical solution of the embodiments of the present invention by combining the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Example 1

As shown in fig. 1, the utility model discloses an artificial wetland system is the stifled type artificial wetland that restraines that can oxygenation, include filter equipment 1, water spray oxygenation device 2, artificial wetland and catch basin 5 that set gradually according to the rivers direction.

The filtering device 1 comprises a filtering tank, a baffle plate 109, a sludge pump 103, a grating 102, a sedimentation inclined plate 105 and a filtering layer 106/107; the baffle is arranged on the upper part of the inner wall of the filtering tank and divides the filtering tank into a primary filtering cavity 110 and a reinforced filtering cavity 111; a water inlet 101 is arranged on the primary filtering cavity 110; the grid 102 is obliquely arranged in the primary filtering cavity 110 at a position lower than the water inlet 101; a water outlet 108 is arranged below the reinforced filter cavity 111 corresponding to the horizontal position of the water inlet 101; the filter layer 106/107 and the sedimentation inclined plate 105 are both arranged in the reinforced filter chamber 111 at a position lower than the water outlet 108, and the filter layers 106 and 107 are positioned above the sedimentation inclined plate 105;

in practical application, the baffle 109 may be fixed or detachable. The fixed type is that a vertical baffle is directly fixed on the inner wall of a filtering tank when the filtering tank is built, the filtering tank is divided into two parts, specifically, a primary filtering cavity 110 and a reinforced filtering cavity 111 which are mutually communicated at the bottom are divided, and a grating 102 is arranged in the primary filtering cavity 110 to realize the primary filtering of large granular substances in sewage; with the continuous rising of the water level in the primary filter cavity 110, the sewage is filtered by the sedimentation inclined plate 105 in the reinforced filter cavity 111, and the suspended solid particles are largely removed by 'shallow sedimentation'; the water level continues to rise, the sewage filtered by the sedimentation sloping plate 105 is filtered by the filter layer 106/107, and suspended solids, colloidal substances and organic matters are further removed; continuously injecting sewage through the water inlet 101, wherein more and more sewage is filtered by the grating 102, the sedimentation inclined plate 105 and the filter layer 106/107, the water level rises to the water outlet 108, and the sewage flows to the water spraying oxygenation device 2 through the water outlet 108; the split formula, if can adopt and set up the spout at the filtering ponds inner wall, set up the slider at the border of baffle 109, baffle 109 passes through the cooperation of slider with the spout and installs in the filtering ponds to can dismantle.

The inclined settling plate 105 and the filter layer 106/107 are installed in the reinforced filter cavity 111 enclosed by the baffle 109 and the filter tank in an interference fit manner, whether fixed or detachable. Namely, the filter is cut according to the size of the reinforced filter cavity 111 by purchasing the required specification of the inclined settling plate 105, and the inclined settling plate covers any cross section of the whole reinforced filter cavity 111 under the action of external force. The sewage passes through the evenly distributed sedimentation inclined plates, and the suspended solid particles are removed in a large amount through 'shallow sedimentation'.

To sum up, the utility model discloses a technical scheme is when setting up baffle 109, and its technical effect that can realize is: firstly, the primary filtering cavity 110 and the reinforced filtering cavity 111 are integrally arranged, so that the whole floor area of the filtering tank is effectively reduced on the premise of ensuring the filtering capacity of sewage; secondly, the water levels in the primary filter cavity 110 and the reinforced filter cavity 111 have the same rising speed, and after the primary filter cavity 110 is primarily filtered and the secondary filtration is not carried out in the reinforced filter cavity 111, the sewage has relative standing and settling time in the rising process, so that the sewage can be primarily settled and filtered before being treated by the reinforced filter cavity 111; thirdly, the combination of the grating 102, the inclined sedimentation plate 105 and the filter layer 106/107 improves the filtering effect; fourthly, the settling inclined plate 105 and the filter layer 106/107 are convenient to mount and fix.

The grating 102 is arranged in the primary filtering cavity 110 in an inclined mode, and the grating 102 has a larger contact area with sewage, so that the high-speed filtering can be conveniently carried out under the condition of large sewage quantity, and the filtering effect is not reduced; in addition, the grid 102 is arranged in the primary filtering cavity 110, and with reference to fig. 1, the grid 102 is arranged at the upper part of the primary filtering cavity 110, so that the workers in sewage treatment can easily fish out pollutants; in addition, when a small amount of large particulate matter remains on the grid 102, the large particulate matter will assist in filtering the subsequent large particulate matter in the wastewater. Preferably, the grids 102 are spaced 5-10mm apart.

For ease of installation and cost reduction, the inclined settling plates 105 are made of polyvinyl chloride.

The filtering layer 106/107 is for further filtering sewage, and is mainly used for adsorbing small particles, organic matters and even for sterilizing sewage according to sewage sources. Therefore, the filter material comprises at least two filter filler layers, wherein the bottom layer realizes filtration, the upper layer realizes adsorption or sterilization, and suspended solid particles, colloidal substances, turbidity and organic matters remained after pretreatment treatment in sewage can be removed. The specific application is as follows: when the filter layer 106/107 is used for a pollution source mainly containing nitrogen and phosphorus, the filter layer 106/107 can be two kinds of fillers with large specific surface area, such as a quartz sand layer and an adsorptive filler layer which are arranged from bottom to top, and the adsorptive filler layer comprises activated carbon or ceramsite; for BOD as the main pollution source, the filter layer 106/107 may be filled with a microbial agent layer, such as a quartz sand layer and a microbial agent layer disposed from bottom to top. In conclusion, the filter layer not only can filter suspended particles, but also can remove part of nitrogen and phosphorus by utilizing the property of the filler, thereby reducing the treatment load of subsequent structures on the nitrogen and phosphorus.

In addition, the filtering device 1 comprises a plurality of partition walls 112 arranged at the bottom of the filtering tank, a sludge groove 104 is formed between any two adjacent partition walls 112, and particulate matters are freely settled under the action of gravity; the sludge pump 103 is disposed in the sludge tank 104. In order to enable the sludge tank 104 to collect enough sludge, the cross section of the sludge tank 104 is in an open structure with a large top and a small bottom, for example, when the partition walls 112 are all in a triangular structure, the cross section of the sludge tank 104 is in an inverted trapezoidal structure (as shown in fig. 1); when the partition wall 112 is formed in a hill shape, the cross section of the sludge tank 104 has a U-shaped structure having an inclined surface. The effect that can be realized is that, in the process of sludge sedimentation, the side of partition wall 112 is the inclined plane so that the landing of mud is convenient for, makes the mud can all fall into the extraction scope of sludge pump 103 finally. Compared with the prior art that the grid 102 is arranged at the position of the sludge pump 103 in the artificial wetland system disclosed in Chinese patent CN104829064A, the grid is a sinking type sludge tank 104, the action range of the sludge pump 103 is only in the local range of the sludge tank 104, but the part of the grid wall of the sludge tank 104 is positioned, the sludge pump 103 can not extract, namely, in the using process, a large amount of sludge can be accumulated on two sides of the grid 102, and the sludge can not be extracted by the sludge pump 103. The utility model discloses because the setting of partition wall 112 then effectively avoids this problem.

To sum up, the utility model discloses a filter equipment 1 is firstly can fully filter sewage, and large granule material can be filtered by grid 102 in the sewage, and the material of granule can freely subside to sludge tank 104 then is extracted by sludge pump 103, and suspended solid such as organic matter is then adsorbed by subsiding swash plate 105, and final small molecule pollutant can be adsorbed by filter layer 106/107, and it fully guarantees that the aquatic particulate material that gets into constructed

wetland

3, 4 greatly reduces, does not contain the suspended solid that can produce the flocculation even; secondly, the grating 102, the inclined sedimentation plate 105 and the filter layer 106/107 are arranged at higher positions, so that manual cleaning and replacement are facilitated; thirdly, in the whole sewage treatment process, the sewage has sufficient free settling time, and the free settling does not influence the sewage treatment process.

The water spraying and oxygen increasing device 2 comprises a water tank 201, a water pipe 204, a spray head 203 and a flow regulating valve 202 on the water pipe, wherein the water inlet end of the water pipe can be communicated with the water outlet 108 through the water tank 201, and the water outlet end of the water pipe can be communicated with the spray head 203; in order to avoid the problem that the shower nozzle 203 is cut off due to the slow water inlet speed of the water inlet 101 of the filter tank or the slow water outlet speed of the water outlet 108 caused by the fault of the device, the water inlet end of the water tank 201 is communicated with the water outlet 108, and the water outlet end is communicated with the water inlet end of the water pipe. The spray head 203 is arranged at the water inlet end of the horizontal subsurface flow constructed wetland 3; the water collecting tank 5 is arranged at the water outlet end of the vertical flow artificial wetland 4. The flow regulating valve and the spray head are respectively used for controlling the water flow speed and the dispersed water flow of the spray head, and the aeration of the water flow is realized in the process of spraying the water flow to the artificial wetland. Through the cooperation of filter equipment and water spray oxygenation device, can follow the interception particulate matter from the source, restrain follow-up constructed wetland and block up, greatly increased constructed wetland oxygen content of intaking simultaneously.

The flow regulating valve 202 is used to control the water flow rate of the spray head 203. After the flow regulating valve 202 is regulated, the spray head 203 sprays water, and because the spray head 203 has the function of dispersing water flow, the water passing through the spray head 203 can have a larger contact area with air when flowing to the horizontal subsurface flow artificial wetland 3, and can generate water splash when being contacted with the horizontal subsurface flow artificial wetland 3, thereby effectively ensuring that the water entering the horizontal subsurface flow artificial wetland 3 has higher oxygen content.

The filtration device 1 is matched with the water spraying oxygenation device 2 to realize the blockage inhibition and oxygenation on the artificial wetland from the source; in addition, both the artificial wetland and the water treatment system have smaller volumes, and the combined energy of the artificial wetland and the water treatment system can be directly used for the existing artificial wetland.

The artificial wetland comprises a horizontal subsurface flow artificial wetland 3 and a vertical subsurface flow artificial wetland 4 which are arranged in series, the two are communicated at the bottom, and when the artificial wetland is specifically applied, the upper parts of the horizontal subsurface flow artificial wetland 3 and the vertical subsurface flow artificial wetland 4 are separated by a partition plate, namely, the discontinuity is realized; the horizontal subsurface flow constructed wetland 3 comprises wetland plants 304, a filler supporting plate 305 and a matrix which are arranged from top to bottom; the substrate comprises cobblestones 301, organic polymer filler 302 and light ceramsite 303 from bottom to top in sequence. The vertical subsurface flow constructed wetland 4 comprises wetland plants 405 and a substrate which are arranged from top to bottom; the substrate comprises cobblestones 401, aluminum sludge composite filler 402 and light ceramsite 403 from bottom to top in sequence; the grain diameter levels of the filler of the horizontal subsurface flow constructed wetland 3 and the vertical subsurface flow constructed wetland 4 are 'small at the top and big at the bottom', and play a role in inhibiting blockage.

The lightweight ceramsite 303(403) is used for pressing the aluminum sludge composite filler 402 to prevent the aluminum sludge composite filler 402 from floating upwards; and secondly, the device is used for realizing the secondary filtration of the sewage. The light ceramsite 303 in the present invention is made of light ceramsite prepared by chinese patent CN1193954C and chinese patent CN 1463947A.

The packing support plate 305 restrains the organic polymer packing 302 within a certain range, and the organic polymer packing 302 is in a vertically suspended state with the flow of the water flow; the sewage through the water spray oxygenation device 2 has a large amount of dissolved oxygen, and the contact oxidation reaction is carried out when the sewage contacts with the organic polymer filler 302, so that the activity of an aerobic biological membrane growing on the surface of the filler is greatly enhanced, the capability of decomposing organic matters by microorganisms is greatly improved, pollutants such as nitrogen, phosphorus, suspended organic matter particles and the like are efficiently removed, and the suspended filler is not easy to block. The organic polymer filler is in contact oxidation with the sewage with higher oxygen content to generate an aerobic biofilm, suspended organic matter particles are efficiently removed, and the suspended filler is not easy to block; the aluminum sludge composite filler has the functions of strengthening flocculation, efficiently removing nitrogen and phosphorus, sterilizing and maintaining the balance of the total bacteria of the filler layer.

The aluminum sludge composite filler 402 is laid on the bottom cobblestones 401, the light ceramsite 403 is added on the aluminum sludge composite filler 402, and the matrix is arranged to enable the water flow in the vertical subsurface flow constructed wetland 4 to permeate from bottom to top, so that the settling time of pollutants in the water flow is increased, and the water purification duration of the whole constructed wetland is prolonged. Compare in prior art from last infiltration down, the utility model discloses it is longer long when permeating, and because the bottom is cobblestone 301(401) for constructed wetland's bottom is difficult for blockking up. If lack the utility model discloses aforementioned filter equipment 1, the utility model discloses perpendicular undercurrent infiltration is very easily blockked up from upwards permeating, consequently, the utility model discloses a filter equipment 1 and constructed

wetland

3, 4's special construction supplement each other.

The aluminum sludge composite filler 402 can be prepared by adopting the method of Chinese patent CN 201610435425.4. Of course, the skilled person can also adjust the matrix according to the specific water quality situation. The artificial wetland system is mainly used for flocculating and sterilizing pollutants, reducing the total bacterial count of a cobble layer and maintaining the balance of microbial communities of the whole artificial wetland system. More flocculated substances or precipitated substances generated after the treatment of the aluminum sludge composite filler 402 are positioned in the middle layer of the artificial wetland, so that the construction requirement of the artificial wetland is reduced; and the second layer and the third layer are used for filtering, so that the water flow can be filtered for three times after passing through the artificial wetland.

When the device is used specifically, the water flow sprayed by the spray head 203 firstly falls into the horizontal subsurface flow constructed wetland 3, the water flow is processed by the vertical subsurface flow constructed wetland 4 after being processed by the horizontal subsurface flow constructed wetland 3 in a transformation mode, the two flow modes ensure that the sewage can be fully processed, in addition, the water flow speed can be improved by changing the water flow mode, the retention amount of the sewage in the constructed wetland is reduced, and the oxygen content in the constructed wetland is also improved.

The water collecting pipeline 404 is arranged at the upper part of the vertical subsurface flow constructed wetland 4 and is used for collecting sewage flowing through the horizontal subsurface flow constructed wetland 3 and the vertical subsurface flow constructed wetland 4; the water collecting tank 5 is communicated with the water collecting pipeline. In order to facilitate the collection of water flow, the water collecting pipe 404 includes a main pipe and a plurality of branch pipes, and water collecting holes are uniformly distributed on the main pipe and the branch pipes.

Finally, in order to realize the reinforced treatment of the sewage floating on the surface, the side wall above the water collecting tank 5 is provided with an artificial wetland water outlet 501, the inside of the water collecting tank is provided with a water collecting baffle plate 502, a sludge discharge port 503 and a sludge discharge pump 504, the water collecting baffle plate 502 divides the water collecting tank 5 into an inner water tank and an outer water tank, and the inner water tank is arranged at the artificial wetland water outlet 501.

Example 2

A method for purifying sewage by a blockage-inhibiting and oxygen-increasing type constructed wetland system comprises the following steps:

step one, controlling sewage to flow into a primary filtering cavity 110 from a water inlet 101 of a filtering device, removing large-particle substances in the sewage by using a grating 102, and ensuring that a spray head 203 can continuously spray water at the inflow speed of the sewage;

step two, the sewage flows into the reinforced filter cavity 111 through the primary filter cavity 110, and suspended solids, colloidal substances and organic matters in the sewage are removed together by the sedimentation inclined plate 105 and the filter layer 106/107; the water outlet speed of the water outlet 108 of the reinforced filter cavity 111 is not more than that of the spray head 203;

thirdly, the sewage treated by the filtering device is sprayed out to the upper part of the horizontal subsurface flow artificial wetland 3 from the spray head 203 through the water spraying and oxygen increasing device 2;

and step four, sewage flows into the horizontal subsurface flow constructed wetland 3 and flows into the collecting tank 5 from the collecting pipeline 404 above the vertical subsurface flow constructed wetland 4.

In detail, the sewage flows into the primary filtering cavity 110 from the water inlet 101 of the filtering device, larger particulate matters in the sewage are intercepted by the grating 102, and workers in sewage treatment can easily fish out the pollutants from the upper surface of the grating 102; after primary filtration, sewage passes through the uniformly distributed sedimentation inclined plates 105, suspended solid particles are largely removed through 'shallow layer sedimentation', then the sewage flows through a quartz sand layer 106 and an activated carbon layer 107 (the sewage with high nitrogen and phosphorus is selected in the embodiment) in the filter layer, suspended solids, colloidal substances and organic matters are further removed, then the treated sewage flows into a water tank 201 of a water spraying and oxygen increasing device 2 from a water outlet 108 of a filtering device, water in the water tank 201 is sprayed to the upper part of the horizontal subsurface flow artificial wetland 3 from a spray head 203 through water pressure to increase oxygen for a water body, the sewage flows in from the horizontal subsurface flow artificial wetland 3 and flows into a water collecting tank 5 from a water collecting pipeline 404 above the vertical subsurface flow artificial wetland 4, the horizontal subsurface flow artificial wetland 3 is connected with the vertical subsurface flow artificial wetland 4 in series, and the removal efficiency of residual nitrogen and phosphorus-containing pollutants and refractory organic matters in the sewage is improved; the water flowing out of the vertical subsurface flow constructed wetland 4 is discharged from the water collecting tank 5 after coarse-grained pollutants are removed by further interception of the water collecting baffle plate 502. As shown in fig. 1, the sludge settled in the sludge tank 104 by the filter device 1 via the inclined sedimentation plate 105 can be pumped out by the sludge pump 103.

The method is specifically applied to application tests in domestic sewage treatment projects in certain rural areas, and COD, ammonia nitrogen and total phosphorus are used as evaluation indexes. Through the test, the utility model discloses an artificial wetland system is 88.3% to the clearance of COD, reaches 91.3% to the clearance of ammonia nitrogen, reaches 95.6% to the clearance of total phosphorus.

Compared with the prior art, the utility model discloses a restrain stifled oxygenation type constructed wetland system and method for purifying sewage thereof, sewage pass through filter equipment's processing in proper order, and the tiny particle that significantly reduces accumulates in constructed wetland matrix and causes the possibility of jam, makes constructed wetland effectively get rid of various pollutants in the sewage. The water spraying oxygen increasing device is adopted, and the dissolved oxygen content of the water body entering the artificial wetland is greatly improved on the basis of not consuming other energy sources. The organic polymer filler in the horizontal subsurface flow constructed wetland is in contact oxidation with the sewage with higher oxygen content, so that the activity of microorganisms in the wetland is greatly enhanced, the capability of the microorganisms for decomposing organic matters is greatly improved, pollutants such as nitrogen, phosphorus, suspended organic matter particles and the like are efficiently removed, and the suspended filler is not easy to block. The aluminum sludge composite filler has the functions of strengthening flocculation, efficiently removing nitrogen and phosphorus, sterilizing and maintaining the balance of the total bacteria of the filler layer.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is not limited to the above embodiments, but can be modified and modified in various ways without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims

1. A blockage-inhibiting and oxygen-increasing type constructed wetland system is characterized by comprising a filtering device, a water spraying and oxygen increasing device, a constructed wetland and a water collecting tank which are sequentially arranged according to the water flow direction;

2. The anti-blocking and oxygen-increasing constructed wetland system as claimed in claim 1, wherein the filtering device further comprises a plurality of triangular partition walls arranged at the bottom of the filtering tank, a sludge tank is formed between any two adjacent partition walls, and a sludge pump is arranged in any sludge tank.

3. The blockage-inhibiting and oxygen-increasing constructed wetland system as claimed in claim 1, wherein the filter layer comprises at least two filter filler layers; when the filter layer is used for a pollution source mainly containing nitrogen and phosphorus, the filter layer comprises a quartz sand layer and an adsorptive filler layer which are arranged from bottom to top, and the adsorptive filler layer comprises activated carbon or ceramsite; when the Biological Oxygen Demand (BOD) is used as a main pollution source, the filter layer comprises a quartz sand layer and a microbial agent layer which are arranged from bottom to top.

4. The blockage-inhibiting and oxygen-increasing constructed wetland system as claimed in claim 1, wherein the constructed wetland comprises a horizontal subsurface flow constructed wetland and a vertical subsurface flow constructed wetland which are arranged in series and are communicated with each other at the bottom; the sewage collecting pipeline is arranged at the upper part of the vertical subsurface flow artificial wetland and is used for collecting sewage flowing through the horizontal subsurface flow artificial wetland and the vertical subsurface flow artificial wetland.

5. The blockage-inhibiting and oxygen-increasing constructed wetland system according to claim 1 or 4, wherein a water collecting baffle is suspended in the water collecting tank, the water collecting baffle divides the water collecting tank into an inner water tank and an outer water tank, and the inner water tank is arranged at the water outlet end of the constructed wetland.

6. The blockage-inhibiting and oxygen-increasing constructed wetland system as claimed in claim 1, wherein the constructed wetland comprises a horizontal subsurface flow constructed wetland and a vertical subsurface flow constructed wetland which are arranged in series and are communicated with each other at the bottom; the sewage collection pipeline is arranged at the upper part of the vertical subsurface flow artificial wetland and is used for collecting sewage flowing through the horizontal subsurface flow artificial wetland and the vertical subsurface flow artificial wetland; the water collecting tank is communicated with the water collecting pipeline.

7. The blockage-inhibiting and oxygen-increasing constructed wetland system according to claim 6, wherein each of the horizontal subsurface flow constructed wetland and the vertical subsurface flow constructed wetland comprises wetland plants and a substrate which are arranged from top to bottom; the horizontal subsurface flow constructed wetland substrate is sequentially composed of cobblestones, organic polymer fillers and light ceramic particles from bottom to top, the vertical subsurface flow constructed wetland substrate is sequentially composed of cobblestones, aluminum sludge composite fillers and light ceramic particles from bottom to top, and the particle size levels of the cobblestones, the aluminum sludge composite fillers and the light ceramic particles are small at the top and large at the bottom.