Tail water deep purification wetland filler system for sewage treatment facility

Abstract

The utility model discloses a tail water deep purification wetland filler system for a sewage treatment facility, which comprises a reaction tank, and a water distribution channel, a filler area and a water collection channel are arranged in the reaction tank; the water distribution channel is a tail water inlet area; the filler area comprises a covering layer, a transition layer, a treatment layer and a water collecting layer which are arranged from top to bottom; a water distribution pipe is arranged between the covering layer and the transition layer and can enable tail water to uniformly enter the filler area; wherein the covering layer is an iron-aluminum mud layer, the transition layer is a zeolite layer, the processing layer is a ceramsite layer, a volcanic rock layer, a zeolite layer or a gravel layer, and the water collecting layer is a pebble layer. The size and the structure of the filler system are reduced according to the ratio of 1: 1 of the actual constructed wetland, the performance and the operation effect of the filler can be better evaluated and converted into actual engineering, verification of the adsorption characteristics of various purification fillers can be achieved, filler combination optimization is conveniently carried out on removal of different types of pollutants, and the application prospect is wide. And guidance is provided for cost reduction and benefit increase of actual engineering.

Description

Technical Field

[0001] The utility model relates to the technical field of artificial functional wetlands, in particular to a tail water deep purification wetland filling system for sewage treatment facilities. Background Art

[0002] With the increasingly stringent environmental protection requirements, many existing wastewater treatment facilities are difficult to meet the discharge requirements. Constructed wetlands can quickly and efficiently remove pollutants such as chemical oxygen demand (COD), nitrogen and phosphorus nutrients, heavy metal ions, and resistance genes in wastewater by utilizing the synergistic effect of filler adsorption, plant absorption, and microbial degradation in the system. It has the advantages of green economy, safety, and effectiveness. Therefore, constructed wetlands are often used as deep treatment processes for domestic sewage and industrial wastewater to further improve the removal rate of pollutants in wastewater and ensure that wastewater meets discharge standards. However, the purification effect of artificial wetlands on pollutants is determined by a variety of factors, such as wastewater water quality characteristics, environmental conditions, operating parameters, and the composition and structure of artificial wetland systems. Among them, among the components of artificial wetland systems, fillers, as its core component, play an important role in the performance of artificial wetland systems in purifying pollutants. Therefore, selecting the right type of fillers and arranging the filler positions reasonably are key factors in the water purification effect of artificial wetlands.

[0003] There are differences in the purification efficiency of fillers made of different matrices for different pollutants. Currently, there is a lack of experience in the selection of fillers, the general characteristics of suitable fillers, and the engineering application of fillers in artificial wetlands. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a tailwater deep purification wetland filler system for sewage treatment facilities. The size and structure of the filler system are restored in 1:1 according to the actual artificial wetland, which can better evaluate the performance and operation effect of the filler and transform it into actual engineering. It can verify the adsorption characteristics of various purification fillers, facilitate the optimization of filler combinations for the removal of different types of pollutants, and provide guidance for cost reduction and efficiency improvement in actual engineering.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A tailwater deep purification wetland filler system for a sewage treatment facility comprises a reaction tank, wherein the reaction tank is provided with a water distribution channel, a filler area and a water collection channel;

[0007] The water distribution channel is the water inlet area for tailwater;

[0008] The filler area includes a covering layer, a transition layer, a treatment layer, and a water collection layer arranged from top to bottom;

[0009] A water distribution pipe is provided between the cover layer and the transition layer, and the water distribution pipe can make the tail water enter the filler area evenly;

[0010] Among them, the covering layer is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a ceramsite layer, a volcanic rock layer, a zeolite layer or a gravel layer, and the water collection layer is a pebble layer.

[0011] Furthermore, the water distribution pipe includes a water distribution main pipe and a plurality of water distribution perforated pipes, the water distribution perforated pipes are provided with water distribution holes, and the water distribution perforated pipes and the water distribution main pipe are arranged in a "cross" shape.

[0012] Furthermore, the filler area is also vertically provided with a plurality of ventilation pipes.

[0013] Furthermore, a water collecting pipe is provided in the water collecting layer of the filler area.

[0014] Furthermore, the water collecting pipe includes a water collecting main pipe and a plurality of water collecting perforated pipes, the water collecting perforated pipes are provided with water collecting holes, and the water collecting perforated pipes and the water collecting main pipe are arranged in a "cross" shape.

[0015] Furthermore, a water outlet pipe is provided at the water collection channel.

[0016] Furthermore, the structural dimensions of the reaction pool are 1.1 m in height, 1.6 m in length and 1.1 m in width.

[0017] Furthermore, the water distribution channel, the filling area and the water collection channel are arranged in sequence from left to right in the reaction tank.

[0018] Furthermore, the system can be designed into two preferred filler combination modes, namely, a high-efficiency COD removal filler combination mode and a high-efficiency denitrification filler combination mode; wherein, the covering layer in the high-efficiency COD removal filler combination mode is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a ceramsite layer, and the water-collecting layer is a pebble layer; the covering layer in the high-efficiency denitrification filler combination mode is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a volcanic rock layer, and the water-collecting layer is a pebble layer.

[0019] The beneficial effects of the utility model are:

[0020] The size and structure of the wetland filler system are restored 1:1 to the actual artificial wetland. Unlike the micro-devices in the laboratory, it can better evaluate the performance and operation effect of the filler and transform it into actual projects.

[0021] The wetland filler system can quickly test the performance of different combinations of fillers, verify the adsorption characteristics of a variety of purification fillers, facilitate the optimization of filler combinations for the removal of different types of pollutants, and provide guidance for cost reduction and efficiency improvement in actual projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the tailwater deep purification wetland filling system of the utility model.

[0023] Figure 2 It is a top view of the tail water deep purification wetland filling system of the utility model.

[0024] In the figure, 1: reaction tank; 2: water distribution channel; 3: filling area, 31: covering layer, 32: transition layer, 33: treatment layer, 34: water collection layer; 35: water distribution pipe, 351: water distribution main pipe, 352: water distribution perforated pipe; 36: water collection pipe; 4: water collection channel; 5: ventilation pipe; 6: water outlet pipe. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] like Figure 1 and Figure 2 As shown, a wetland filling system for deep purification of tail water of a sewage treatment facility comprises a reaction tank 1, wherein the reaction tank 1 is provided with a water distribution channel 2, a filling area 3 and a water collection channel 4.

[0028] The reaction pool 1 is an outer frame structure composed of a 5 mm thick acrylic plate, and its structural dimensions are 1.1 m in height, 1.6 m in length, and 1.1 m in width.

[0029] The water distribution channel 2 , the filling area 3 and the water collection channel 4 are arranged in sequence from left to right in the reaction tank 1 .

[0030] The water distribution channel 2 is the water inlet area of ​​the tail water, and its structural dimensions are 1.1m high, 0.3m long and 1.1m wide.

[0031] The structural dimensions of the filling area 3 are 1.1 m in height, 1.0 m in length and 1.1 m in width.

[0032] The structural dimensions of the water collection channel are 1.1 m high, 0.3 m long and 1.1 m wide.

[0033] The packing area includes a covering layer 31, a transition layer 32, a treatment layer 33, and a water collecting layer 34 arranged from top to bottom. A water distribution pipe 35 is arranged between the covering layer 31 and the transition layer 32, and the water distribution pipe 35 can make the tail water enter the packing area 3 evenly; the water distribution pipe 35 includes a water distribution main pipe 351 and a plurality of water distribution perforated pipes 352, each of which is provided with a plurality of water distribution holes along the direction of water flow, and the plurality of water distribution perforated pipes 352 are distributed on both sides of the water distribution main pipe 351, and are arranged in a "cross" shape with the water distribution main pipe 351. The length of each water distribution perforated pipe 352 is 0.4m; through the water distribution main pipe 351 and the water distribution perforated pipe 352, the water flows evenly into the packing area 3. The water flows into the water collecting layer 34 from top to bottom. A water collecting pipe 36 is arranged in the water collecting layer 34. The water collecting pipe 36 includes a water collecting main pipe and a plurality of water collecting perforated pipes, each of which is provided with a plurality of water collecting holes. The plurality of water collecting perforated pipes are distributed on both sides of the water collecting main pipe and are arranged in a "cross" shape with the water collecting main pipe. The length of each water collecting perforated pipe is 0.4m. The packing area 3 is also vertically provided with a plurality of ventilation pipes 5, each of which is 1.2m high, to ensure that the internal and external air pressures are the same, so that the tail water can smoothly pass through the water distribution perforated pipe 352 and the treatment layer 33 and then flow into the water collecting pipe 36 in the water collecting layer 34, and be discharged into the water collecting channel 4. In addition, the packing system is also connected to a submersible pump, and under the power of the pump, the tail water is processed by the system.

[0034] The covering layer 31 in the packing area 3 is an iron-aluminum mud layer, the transition layer 32 is a zeolite layer, the treatment layer 33 can be one of a ceramsite layer, a volcanic rock layer, a zeolite layer, and a gravel layer, and the water collection layer 34 is a pebble layer. The core purification packing in the packing area 3 can be selected from one of volcanic rock, gravel, ceramsite, and zeolite, and the particle size is 3-10mm. The particle size of the iron-aluminum mud packing is 3-10mm. The particle size of the pebble packing is 30-40mm.

[0035] The packing area 3 can select a variety of packing combinations, such as a high-efficiency COD removal type packing combination and a high-efficiency nitrogen removal type packing combination.

[0036] High-efficiency COD removal filler combination: from top to bottom, it is iron-aluminum mud layer, zeolite layer, ceramsite layer, and pebble layer. The filler dosage ratio is 2:3:3:2, and the overall filler height is 100cm. Iron-aluminum mud is used as a covering layer to reserve a place for emergent plants to be planted; zeolite is a transition layer, which is used as a primary filter; ceramsite is a treatment layer, which is the core material for water purification; pebbles are a water collection layer, which is mainly used to allow tail water after purification to enter the water collection pipe. This combination is suitable for tail water with high COD content, including tail water with a high C / N ratio, to solve the problem of too high COD after removing total nitrogen.

[0037] High-efficiency denitrification filler combination: from top to bottom, it is iron-aluminum mud layer, zeolite layer, volcanic rock layer, and pebble layer. The filler dosage ratio is 2:2:4:2, and the overall height of the filler is 100cm. Iron-aluminum mud is used as the covering layer to reserve a place for the colonization of emergent plants; zeolite is the transition layer, which is used as the primary filtration; volcanic rock is the core treatment layer, which is used as the secondary filtration; pebbles are the water collection layer, which is used to allow the tail water after purification to enter the water collection pipe. This combination is suitable for tail water with high ammonia nitrogen and total nitrogen content and tail water with low C / N ratio, and enhances the adsorption of ammonia nitrogen and total nitrogen.

[0038] Single test example of filler

[0039] The experiment was carried out at the Hengtong Hehai Project Base. This experiment tested the performance of four types of fillers (volcanic rock, zeolite, ceramsite, gravel, and particle size of 3-10 mm). The experimental device used was a device that filled a single type of filler in the test pool, and the volume of the filler was 0.05m 3 The test water is the tail water after treatment by a local sewage facility, in which COD Mn The initial values ​​of NH3-N, TP, and TN were 9.36 mg / L, 2.352 mg / L, 2.48 mg / L, and 14.867 mg / L, respectively. The treated water volume was 50 L / day, and the project testing time lasted for 15 days. The treated COD, ammonia nitrogen, total nitrogen, and total phosphorus water quality data were regularly measured. The final test results are shown in Table 1.

[0040] Table 1 Comparison of pollutant removal effects of four fillers

[0041]

[0042]

[0043] As can be seen from the above table, the removal rates of COD by the four fillers are as follows: ceramsite>zeolite>volcanic rock>gravel. Ceramsite has the best adsorption of COD, with a removal rate of 81.6%, while gravel is only 11.2%. The removal rates of TN by the four fillers are as follows: volcanic rock>zeolite>gravel>ceramsite. Volcanic rock has the best adsorption of total nitrogen, with a removal rate of 34.6%, while ceramsite is only 16.2%. The adsorption performance of ammonia nitrogen by the four fillers is similar, with removal rates above 90%. The removal rates of TP by the four fillers are as follows: gravel>ceramsite>volcanic rock>zeolite. Gravel has the best adsorption of total phosphorus, with a removal rate of 99.8%. The removal rates of the other three fillers are also above 85%.

[0044] Example 1

[0045] The wetland filling system of the utility model is implemented at the Hengtong Hehai project base. The test water is the tail water after the sewage facility in a certain place is treated. After pretreatment, the COD content is increased. During the formal test, the COD Mn The initial values ​​of NH3-N, TP and TN were 18.797 mg / L, 0.157 mg / L, 0.307 mg / L and 4.457 mg / L respectively. According to the characteristics of tail water, its COD content is relatively high, and a high-efficiency COD removal filler combination (2 iron-aluminum mud: 3 zeolite: 3 ceramsite: 2 pebbles, with a total filler volume of 1m 3 ) and downward submerged flow operation mode; the water treatment volume is 1 ton / day, the project detection time lasts for 15 days, and the water quality data of COD, ammonia nitrogen, total nitrogen and total phosphorus after treatment are regularly measured. The results are shown in Tables 2 and 3.

[0046] Table 2 Pollutant removal effect of high-efficiency COD removal type filler combination

[0047]

[0048]

[0049] Table 3 Comparison of pollutant content before and after treatment

[0050]

[0051] As shown in Table 2 and Table 3, the high-efficiency COD removal type filler combination effectively reduces the COD concentration in the tail water, among which the removal rate of CODMn reaches 76.7%, which is improved from Class A to Class II surface water standard before and after treatment; the removal rate of TP reaches 99.3%, which is improved from Class V to Class I surface water standard before and after treatment; and the removal rate of TN reaches 30.3%. Therefore, the high-efficiency COD removal type filler combination is suitable for water bodies with high COD content. Compared with single ceramsite or zeolite, it not only ensures the removal effect of COD, but also enhances the removal effect of ammonia nitrogen, total phosphorus and total nitrogen. At the same time, zeolite is a natural mineral material with low price. In actual projects, it can reduce some costs while ensuring that the water quality meets the standards.

[0052] Example 2

[0053] The wetland filling system of the utility model was implemented at the Hengtong River and Sea Project Base. The test water was the tail water after being treated by a local sewage facility, in which COD Mn The initial values ​​of NH3-N, TP, and TN were 13.273 mg / L, 6.187 mg / L, 2.887 mg / L, and 18.156 mg / L, respectively. According to the characteristics of the tailwater, the total nitrogen content was high and the C / N ratio was low. The test group used a high-efficiency denitrification filler combination (ferroaluminum mud 2: zeolite 2: volcanic rock 4: pebbles 2, with a total filler volume of 1m 3) and downward submerged flow operation. The water treatment volume was 1 ton / day, and the project testing time lasted for 15 days. The water quality data of COD, ammonia nitrogen, total nitrogen, and total phosphorus after treatment were regularly measured. The results are shown in Tables 4 and 5.

[0054] Table 4 Pollutant removal effect of high-efficiency denitrification filler combination

[0055] Time / Day <![CDATA[COD Mn Removal rate]]> <![CDATA[NH3-N removal rate]]> TP removal rate TN removal rate 1 33.7％ 65.3％ 93.2％ 31.0％ 4 41.7％ 73.5％ 94.9％ 41.6％ 7 49.7％ 81.7％ 95.0％ 48.7％ 11 60.1％ 86.1％ 95.8％ 60.7％ 15 70.5％ 90.6％ 96.7％ 67.4％

[0056] Table 5 Comparison of pollutant content before and after treatment

[0057]

[0058] It can be seen from Table 4 and Table 5 that the high-efficiency denitrification filler combination effectively reduces the concentration of various pollutants in the tail water, among which COD Mn The removal rate of NH3-N reached 90.6%, which was improved from Class B to Class III surface water before and after treatment; the removal rate of TP reached 96.7%, which was improved from Class B to Class II surface water before and after treatment; the removal rate of TN reached 67.4%, which was improved from Class B to Class A before and after treatment. It can be seen that the high-efficiency denitrification filler combination has good adsorption performance for total nitrogen.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wetland filling system for deep purification of tail water in sewage treatment facilities, characterized in that: It comprises a reaction tank, wherein the reaction tank is provided with a water distribution channel, a filling area and a water collection channel; The water distribution channel is the water inlet area for tailwater; The filler area includes a covering layer, a transition layer, a treatment layer, and a water collection layer arranged from top to bottom; A water distribution pipe is provided between the cover layer and the transition layer, and the water distribution pipe can make the tail water enter the filler area evenly; Among them, the covering layer is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a ceramsite layer, a volcanic rock layer, a zeolite layer or a gravel layer, and the water collection layer is a pebble layer.

2. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: The water distribution pipe includes a water distribution main pipe and a plurality of water distribution perforated pipes. The water distribution perforated pipes are provided with water distribution holes, and the water distribution perforated pipes and the water distribution main pipe are arranged in a "cross" shape.

3. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: The filler area is also vertically provided with a plurality of ventilation pipes.

4. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: A water collecting pipe is arranged in the water collecting layer of the filling area.

5. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 4, characterized in that: The water collecting pipe comprises a water collecting main pipe and a plurality of water collecting perforated pipes, the water collecting perforated pipes are provided with water collecting holes, and the water collecting perforated pipes and the water collecting main pipe are arranged in a "cross" shape.

6. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: A water outlet pipe is arranged at the water collecting channel.

7. A wetland filling system for deep tailwater purification of sewage treatment facilities according to claim 1, characterized in that: The structural dimensions of the reaction pool are 1.1 m in height, 1.6 m in length and 1.1 m in width.

8. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: The water distribution channel, the filling area and the water collection channel are arranged in sequence from left to right in the reaction tank.

9. A tailwater deep purification wetland filling system for sewage treatment facilities according to claim 1, characterized in that: The system includes two filler combination modes, namely, a high-efficiency COD removal filler combination mode and a high-efficiency nitrogen removal filler combination mode; wherein, the covering layer in the high-efficiency COD removal filler combination mode is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a ceramsite layer, and the water collection layer is a pebble layer; the covering layer in the high-efficiency nitrogen removal filler combination mode is an iron-aluminum mud layer, the transition layer is a zeolite layer, the treatment layer is a volcanic rock layer, and the water collection layer is a pebble layer.

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