CN213623485U

CN213623485U - Artificial wetland plant bed device with electrolysis coupling biological support

Info

Publication number: CN213623485U
Application number: CN202021650910.1U
Authority: CN
Inventors: 卢少勇; 赵斌; 刘晓晖; 郑丙辉; 徐佳敏; 刘莹; 国晓春; 李亮星; 李明
Original assignee: Chinese Research Academy of Environmental Sciences; Yuxi Normal University
Current assignee: Chinese Research Academy of Environmental Sciences; Yuxi Normal University
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-07-06
Anticipated expiration: 2030-08-10

Abstract

The application discloses an electrolytic coupling biological support constructed wetland plant bed device, which comprises a standard main body; the standard main body is a box body, a plurality of vertical round pipes are arranged in the box body, a plurality of through holes are formed in the pipe walls of the round pipes, and the round pipes are configured to be used for planting pinwheel grass; the standard main body is provided with a water inlet and a water outlet, the water inlet is arranged at the bottom of the standard main body, and the water outlet is arranged at the top of the standard main body; and an electrode plate is arranged in the standard main body and comprises a cathode plate and an anode plate, and at least 1 row of circular tubes are arranged between the cathode plate and the anode plate at intervals. One technical effect of the present application lies in that the present application can be used for treating sewage.

Description

Artificial wetland plant bed device with electrolysis coupling biological support

Technical Field

The application belongs to the field of sewage treatment equipment, and particularly relates to an artificial wetland plant bed device with an electrolytic coupling biological support.

Background

Non-point source pollution is the main pollution source of water bodies such as rivers, lakes and the like at present, and seriously threatens water ecology and drinking water safety. Rural domestic sewage is used as one of non-point source pollutants which is difficult to control, contains a large amount of phosphorus and antibiotic pollutants, and needs an economical and effective treatment technology urgently.

The artificial wetland technology has the advantages of ecology, economy, convenient management and operation and the like, becomes one of the optimal choices for treating rural domestic sewage, and has better effect on removing pollutants such as antibiotics, phosphorus and the like. The constructed wetland also has some bottleneck problems, the constructed wetland is mainly used for low-pollution water, the problem that the C/N ratio of the low-pollution water is low generally exists, the nitrogen and phosphorus removal effect of the constructed wetland is poor under the environmental condition of low C/N ratio, and a carbon source is required to be added to improve the nitrogen and phosphorus removal efficiency of the constructed wetland. The constructed wetland substrate with the substrate is easy to block, and the long-acting removal of pollutants is seriously influenced; the removal capacity of the constructed artificial wetland plant bed with the matrix banning is relatively limited, and the adsorption removal capacity is reduced due to withering and decay under the low-temperature condition in winter.

Therefore, it is necessary to provide an artificial wetland plant bed device with an electrolytic coupling biological scaffold.

Disclosure of Invention

An object of the application is to provide a new technical scheme of the artificial wetland plant bed device with the electrolysis coupling biological support.

According to one aspect of the application, the application discloses an electrolytic coupling biological scaffold constructed wetland plant bed device, which comprises a standard main body; the standard main body is a box body, a plurality of vertical round pipes are arranged in the box body, a plurality of through holes are formed in the pipe walls of the round pipes, and the round pipes are configured to be used for planting pinwheel grass; the standard main body is provided with a water inlet and a water outlet, the water inlet is arranged at the bottom of the standard main body, and the water outlet is arranged at the top of the standard main body; and an electrode plate is arranged in the standard main body and comprises a cathode plate and an anode plate, and at least 1 row of circular tubes are arranged between the cathode plate and the anode plate at intervals.

Optionally, a plurality of said standard bodies in series or in parallel are included.

Optionally, the device further comprises a direct current stabilized power supply, and the electrode plate is connected with the direct current stabilized power supply through a titanium lead.

Optionally, a plurality of through holes are provided on the electrode plate.

Optionally, the electrode plates comprise two cathode electrode plates and one anode electrode plate

Optionally, the standard body internal dimensions are 500mm by 300mm by 450mm length by width by height.

Optionally, the height of the circular tube is 400mm, the diameter of the circular tube is 60mm, and the aperture of the through hole in the tube wall is 4 mm; and 24 round pipes are arranged in the standard main body.

Optionally, the box body of the standard main body is made of a PE material with the thickness of 8mm, and the round pipe is a PVC pipe.

Optionally, the electrode plate is made of iron with purity of more than 99%, and has a thickness of 2cm, a length of 35cm and a width of 28 cm.

Optionally, the device further comprises a peristaltic pump, and the peristaltic pump is connected with the water inlet of the standard main body.

One technical effect of the present application lies in that the present application can be used for treating sewage.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of some embodiments of the present application;

FIG. 2 is a partial schematic diagram of some embodiments of the present application;

in the figure: 1 standard main body, 11 water inlets, 12 water outlets, 2 round pipes, 3 cathode plates, 4 anode plates, 5 direct-current stabilized power supplies and 6 peristaltic pumps.

Detailed Description

Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

The present application provides an electrolytically-coupled bioscaffold constructed wetland plant bed apparatus, in some embodiments, with reference to fig. 1 and 2, comprising a standard body 1.

The standard main body 1 is a box body. The box body of the standard main body 1 can be made of PE material with the thickness of 8mm, and the length multiplied by the width multiplied by the height of the internal dimension is 500mm multiplied by 300mm multiplied by 450 mm.

A plurality of vertical round tubes 2 are arranged in the standard main body 1, and the standard main body is not filled with a matrix. The setting of pipe makes inevitably to have the hole between the adjacent pipe, rather than laminating completely, be provided with a plurality of through-holes on the pipe wall of pipe 2 for pipe 2 provides bigger area of adhering to and do not hinder the flow of rivers as the growth carrier of microorganism. Planting one pinwheel grass in each circular tube 2 with planting densityCan be 160 strains/m^-2. The circular tube 2 can be a PVC tube, the height of the circular tube 2 can be 400mm, the diameter of the circular tube 2 can be 60mm, and the aperture of the through hole in the tube wall can be 4 mm; in the standard body 1 of 500mm × 300mm × 450mm, 24 of the circular tubes 2 may be provided.

The standard main body 1 is provided with a water inlet 11 and a water outlet 12, the water inlet 11 is arranged at the bottom of the standard main body 1, the water outlet 12 is arranged at the top of the standard main body 1, sewage enters the standard main body 1 from the bottom and flows out of the standard main body 1 from the top, and the hydraulic retention time can be 3d under normal conditions. The peristaltic pump 6 may be connected to the water inlet 11 and sewage may be pumped into the standard body 1 via the peristaltic pump 6.

An electrode plate is arranged in the standard main body 1. The electrode plate comprises a cathode plate 3 and an anode plate 4, and at least 1 row of circular tubes 2 are arranged between the cathode plate 3 and the anode plate 4 at intervals, so that the cathode plate 3 and the anode plate 4 are physically separated and cannot be in direct contact. The electrode plate can be made of iron with the purity of more than 99%, and is 2cm in thickness, 35cm in length and 28cm in width. The electrode plate can also be provided with a plurality of through holes. The application can also comprise a direct current stabilized voltage power supply 5, and the electrode plate is connected with the direct current stabilized voltage power supply 5 through a titanium lead. In general, the power is applied once a day, the power voltage can be 10V, 4 hours are applied each time, and the current density is 0.043-0.12A/m in the whole operation period². In some different embodiments, a double cathode and single anode arrangement with two cathode plates 3 and one anode plate 4 can be used to prolong the consumption of the anode electrode.

The device can treat sewage with low C/N ratio, mainly treat low-polluted water, persistent organic pollutants and influent COD_CrThe concentration ranges of TN and TP are preferably 40-150 mg/L, 10-30 mg/L and 0.5-4 mg/L; the concentration of the inlet water is not too high, and the inlet water is higher than the treatment range, so that a pretreatment facility can be added at the front section of the device.

The principle of synchronous denitrification and dephosphorization of pollutants by electrolytic treatment is as follows: 1) ammonia nitrogen at the electrolytic anode is directly oxidized into nitrogen and is dissipated into the atmosphere; 2) the nitrate nitrogen of the cathode is reduced into nitrogen; 3) the metal cations or hydrates thereof generated by the anode material form precipitates with phosphate in water to remove phosphorus. The electrochemical method can overcome the problems of reduced pollutant removal effect and the like caused by inhibiting the activity of microorganisms at low temperature through the redox reaction generated by electron transfer without the action of microorganisms.

The windmill grass improves the oxidation-reduction condition through pollutant absorption and root system oxygen secretion in the whole system to remove pollutants, and the contribution rate of plants in the whole system to the removal of pollutants is about 20-40%.

The application utilizes the electrochemical principle, so that the constructed wetland can still normally run under the extreme environment (low temperature and low C/N), can synchronously remove nitrogen and phosphorus, and remove refractory pollutants (antibiotics and the like), still has stable treatment effect on low-temperature water inflow at 4-10 ℃, plants are harvested and maintained during 12 months and 1 month every year, and the plants are properly reseeded in spring. The harvested plants (burned into biochar groups through a high-temperature oxygen-limiting tube furnace at the temperature of 800-900 ℃) are used for preparing biomass carbon, and are used for supplementing the carbon source of the artificial wetland, so that the denitrification effect of the artificial wetland is improved.

Due to the electrochemical action, the amount of sludge generated in the treatment process is small, and normal operation of the device can be met by once dredging in 1-2 years. The nearly 90% removal rate of nitrogen, phosphorus and the like and the 100% removal rate of sulfamethoxazole are realized through the actions of electrocatalytic oxidation, electric flocculation and the like.

In the electrochemical process, the clean reagent of electrons is used for realizing the oxidation-reduction process of pollutants, the electrons are only transferred between the electrode and the wastewater component, and the redox agent is not required to be added additionally, so that the problem of secondary pollution caused by adding the reagent in the conventional chemical process is solved; the electrochemical method for removing the nitrogen pollutants is to directly oxidize ammonia at the anode of the electrode or convert the ammonia nitrogen into nitrogen through the indirect oxidation of a system, and convert nitrate nitrogen into nitrogen, nitric oxide and the like at the cathode through the direct reduction of the nitrate nitrogen, so that the ammonia nitrogen and the nitrate nitrogen are removed, a carbon source is not required to be added, and the effect of removing nitrogen is achieved without adding any chemical reagent under the condition of low C/N ratio. The principle of the electric flocculation technology for removing phosphorus is to remove phosphorus in sewage by utilizing metal cations or hydrates thereof generated by anode materials such as iron and lead during electrolysis to form precipitates with phosphate in the sewage. The electrolytic coupling artificial wetland has the advantages that the electrolytic coupling artificial wetland generates an oxidation-reduction reaction through clean electrons, so that the defect that toxic and harmful substances such as antibiotics inhibit the biochemical reaction of microorganisms is overcome, and the toxic and harmful substances such as antibiotics can be effectively removed; under extreme environments such as low temperature and the like, the plant bed of the artificial wetland of the electrolytic coupling biological scaffold still has better removal efficiency on pollutants; the application of the iron electrode can strengthen the stroke of the iron film on the root surface of the aquatic plant, resist the damage of toxic and harmful substances to the plant and play a role in removing pollutants by the plant to a greater extent.

The pretreatment facility may include 1) a conditioning tank: the homogenizing and quantity-balancing effect of the inlet water is enhanced, and the running stability of the device is enhanced; 2) hydrolytic acidification (anaerobic treatment) improves the biodegradability of the device water inlet, and is favorable for removing pollutants through biochemical reaction.

In some embodiments, the device comprises a plurality of standard main bodies 1 which are connected in series or in parallel, wherein the standard main bodies 1 are made into a module (unit), and the large artificial wetland is assembled (assembled) by the modules with uniform specifications of series connection and parallel connection according to the treated water quantity, so that the flexibility of field assembly of the device is increased, and the large-scale production is facilitated.

The suitable Hydraulic Retention Time (HRT) of the sewage of the device is 1-3 days, and the size of a single module of the artificial wetland plant bed of the electrolytic coupling biological bracket and the number of the required assembly modules are determined according to the hydraulic retention time and the required sewage treatment amount; such as treatment of 1m³The effective volume of the 'electrolysis coupling biological support constructed wetland plant bed' module has the water treatment quantity of 0.33-1m³/d。

As used in the specification and claims, certain terms are used to refer to particular components or methods. As one skilled in the art will appreciate, different regions may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not in name. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electrolytic coupling biological support constructed wetland plant bed device is characterized by comprising a standard main body; the standard main body is a box body, a plurality of vertical round pipes are arranged in the box body, a plurality of through holes are formed in the pipe walls of the round pipes, and the round pipes are configured to be used for planting pinwheel grass; the standard main body is provided with a water inlet and a water outlet, the water inlet is arranged at the bottom of the standard main body, and the water outlet is arranged at the top of the standard main body; and an electrode plate is arranged in the standard main body and comprises a cathode plate and an anode plate, and at least 1 row of circular tubes are arranged between the cathode plate and the anode plate at intervals.

2. The electrolytically-coupled bioscaffold constructed wetland plant bed apparatus of claim 1, comprising a plurality of said standard bodies in series or in parallel.

3. The electrolytic coupling biological scaffold artificial wetland plant bed device of claim 1, further comprising a direct current stabilized power supply, wherein the electrode plate is connected with the direct current stabilized power supply through a titanium lead.

4. The electrolytic coupling biological scaffold artificial wetland plant bed device of claim 1, wherein a plurality of through holes are arranged on the electrode plate.

5. The electrolytically-coupled bioscaffold artificial wetland plant bed apparatus of claim 1, wherein said electrode plates comprise two negative electrode plates and one positive electrode plate.

6. The electrolytically-coupled bio-scaffold artificial wetland plant bed apparatus of claim 1, wherein the standard body has internal dimensions of 500mm x 300mm x 450mm in length x width x height.

7. The constructed wetland plant bed device with the electrolytic coupling biological scaffold as recited in claim 6, wherein the round tube has a height of 400mm and a diameter of 60mm, and the diameter of the through hole on the tube wall is 4 mm; and 24 round pipes are arranged in the standard main body.

8. The electrolytic coupling biological scaffold artificial wetland plant bed device of claim 6, wherein the box body of the standard main body is made of PE material with the thickness of 8mm, and the round tube is a PVC tube.

9. The electroanalysis coupling biological scaffold artificial wetland plant bed device of claim 6, wherein the electrode plates are made of iron with purity of more than 99%, and have a thickness of 2cm, a length of 35cm and a width of 28 cm.

10. The electrolytic coupling biological scaffold artificial wetland plant bed device according to any one of claims 1 to 9, further comprising a peristaltic pump connected to the water inlet of the standard body.