CN117658334A - Photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device - Google Patents
Photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device Download PDFInfo
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Abstract
The invention discloses a photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device, which comprises a photocatalysis unit positioned at the front end of the vertical flow constructed wetland device, and also comprises an electromagnetic composite field formed by embedding a direct current electric field into a mutually-attracted magnetic field, wherein the electromagnetic composite field comprises a magnetic field and an electric field, the electric field is formed by connecting two graphite plates with 3.7V of voltage stabilizing current, one end of the vertical flow constructed wetland device is provided with a water inlet, the outside of the water inlet is provided with a valve and a water inlet pipeline connected with the valve, the water inlet pipeline is connected with a submersible pump, the other end of the vertical flow constructed wetland device is provided with a water outlet pipeline, and the water outlet pipeline is connected with a water storage barrel for placing the submersible pump. The embedded magnetic field reinforced vertical flow constructed wetland reactor is constructed, the biological activity of the object is improved by utilizing the magnetic field effect with proper strength, the adsorption capacity of the filler is increased, and the pollutant purification efficiency of the vertical flow constructed wetland is improved.
Description
Technical Field
The invention belongs to the field of domestic sewage purification, and relates to a photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device.
Background
The constructed wetland is widely applied due to good ecological properties, and the removal of pollutants by the constructed wetland mainly depends on the synergistic effect of matrixes, microorganisms, plants and the like. However, in the application process, a plurality of problems are also exposed, including the problems of easy influence of climate and temperature, reduced oxygen content of water body after long-time operation, easy blockage of matrix and the like, and the problems influence the purification effect of the constructed wetland on sewage to a certain extent.
The research on the constructed wetland is now developed towards how to improve the ecological purification efficiency of the constructed wetland, and the vertical flow constructed wetland can be applied to rural decentralized sewage treatment devices due to the characteristics of higher efficiency, small occupied area and the like, and the magnetic field effect with proper strength is beneficial to enhancing the activity of microorganisms in the constructed wetland, improving the adsorption capacity of matrix fillers, increasing the biomass of plants and the like, and enhancing the pollutant removal effect.
However, the vertical flow constructed wetland has the following technical defects:
(1) The pollutant removal time is long, and the effluent quality is unstable;
(2) The adsorption capacity of the matrix filler is not strong;
(3) The microbial activity is obvious along with the environmental change, and the activity is obviously weaker at low temperature, so that the quality of the effluent is affected.
Disclosure of Invention
Based on the above, the invention aims to provide a photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device so as to solve the technical problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device comprises a photocatalysis unit positioned at the front end of the vertical flow constructed wetland device, wherein the photocatalysis unit consists of 4 honeycomb TiO2 plates and 4 UV ultraviolet lamp tubes, and the power of the UV ultraviolet lamp tubes is 17W;
the electromagnetic composite field is composed of a magnetic field and an electric field, wherein the magnetic field is composed of 12 ferrite magnetic plates, and the magnetic field strength is 35mT;
the electric field consists of two graphite plates connected with 3.7V of stabilized current;
the vertical flow constructed wetland device is characterized in that one end of the vertical flow constructed wetland device is provided with a water inlet, a valve and a water inlet pipeline connected with the valve are arranged outside the water inlet, the water inlet pipeline is connected with a submersible pump, the other end of the vertical flow constructed wetland device is provided with a water outlet pipeline, and the water outlet pipeline is connected with a water storage barrel for placing the submersible pump.
Preferably, the honeycomb TiO 2 The specifications of the plates were 600mm by 380mm by 10mm.
Preferably, the specification of the UV lamp tube is 436mm multiplied by 23mm.
Preferably, the specification of the ferrite magnetic plate is 150mm×100×5mm.
Preferably, the graphite sheet has a gauge of 600mm by 380mm by 10mm.
Preferably, the water outlet pipeline penetrates into the water storage barrel, and the water outlet is arranged at the opening of the pipe section.
In summary, the invention has the following advantages:
1. the embedded magnetic field reinforced vertical flow constructed wetland reactor is constructed, the biological activity of the object is improved by utilizing the magnetic field effect with proper strength, the adsorption capacity of the filler is increased, and the pollutant purification efficiency of the vertical flow constructed wetland is improved.
2. Compared with the VFCW without compound field reinforcement, when the COD content of the inflow water is higher than 200.00mg/L, the removal rate of the PEM-VFCW is improved by 11.00%; when the concentration is lower than 200.00mg/L, the concentration is improved by 9.00 percent; NH (NH) 4 + When the content of the N is higher than 30.00mg/L, the removal rate of the PEM-VFCW is improved by 49%; when the concentration is lower than 30.00mg/L, the concentration is increased by 29.33 percent; 3 physical measures of photocatalysis, electric field and magnetic field are introduced into the vertical flow constructed wetland, so that COD and NH can be improved 4 + -removal efficiency of N; and under the condition that the hydraulic load is 1.8m < 3 > and d and the operation is carried out for 72 hours, the pollutant treatment efficiency is higher; in addition, the specific surface area of the filler is increased, the adsorption effect is enhanced, and the details can be seen from the accompanying figures 3-6.
Drawings
FIG. 1 is a schematic diagram of a PEM-VFCW reactor;
FIG. 2 is a schematic diagram of a VFCW reactor;
FIG. 3 is a deep showing of gravel without strengthening;
FIG. 4 is a deep representation of gravel after photocatalysis and electromagnetic field enhancement;
FIG. 5 is a deep display of ceramsite without strengthening effect;
FIG. 6 is a deep display of a ceramic grain after photocatalytic and electromagnetic field strengthening;
FIG. 7 is a graph showing the comparison of inlet and outlet water quality of different wetlands COD and NH4+ -N;
FIG. 8 shows different wetlands TP and PO 4 3 -P inlet and outlet water quality vs. histogram;
FIG. 9 is a graph comparing removal efficiency of COD for wetlands at different run times;
FIG. 10 is a plot of different run time wetland vs. NH 4 + -a graph comparing the removal efficiency of N;
FIG. 11 is a graph of different run time wetland pairs TP and PO 4 3 -a graph of removal efficiency versus P;
FIG. 12 is a representation of colony composition of wet ground based microorganisms at the phylum, class level;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
Examples
As shown in fig. 1, the application provides a photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device, which comprises a photocatalysis unit positioned at the front end of the vertical flow constructed wetland device, wherein the photocatalysis unit consists of 4 honeycomb TiO2 plates and 4 UV ultraviolet lamp tubes, and the power of the UV ultraviolet lamp tubes is 17W;
the electromagnetic composite field is composed of a magnetic field and an electric field, 12 ferrite magnetic plates are arranged in the magnetic field, and the intensity of the formed magnetic field is 35mT;
the electric field consists of two graphite plates connected with 3.7V of stabilized current;
one end of the vertical flow constructed wetland device is provided with a water inlet, a valve and a water inlet pipeline connected with the valve are arranged outside the water inlet, the water inlet pipeline is connected with a submersible pump, the other end of the vertical flow constructed wetland device is provided with a water outlet pipeline, and the water outlet pipeline is connected with a water storage barrel for placing the submersible pump.
It should be understood that in this embodiment, the honeycomb TiO 2 The specification of the plate is 600mm multiplied by 380mm multiplied by 10mm; the specification of the UV lamp tube is 436mm multiplied by 23mm; the specification of the ferrite magnetic plate is 150mm multiplied by 100 mm multiplied by 5mm; the specifications of the graphite plates were 600mm by 380mm by 10mm.
In addition, the water outlet pipeline penetrates into the water storage barrel, and the water outlet is arranged at the opening of the pipe section and can be used as a sampling port in a test.
In the embodiment, water inlet and water outlet of the device are controlled by a valve, the water inlet and the water outlet of the device are uniformly sampled from the water outlet, the whole device is circulated by power provided by the submersible pump, water enters the electro-magnetic composite constructed wetland unit through the bottom hole after entering the water inlet, water is discharged from the water outlet pipeline after passing through the electro-magnetic composite field-constructed wetland through the photocatalysis-electromagnetic composite field-constructed wetland, and power provided by the submersible pump returns to the water inlet, so that the water is circulated and reciprocated.
In connection with the above examples of the present application, the following test methods will be provided:
1. materials and methods
1.1 Experimental apparatus and operation
The device parameters are tested as in table 1.
Table 1 device parameters
The fillers of the photocatalysis and electromagnetic field coupling vertical flow constructed wetland (PEM-VFCW) are ceramsite (particle size 4-6 mm) and gravel (particle size 6-9 mm), and all the fillers are cleaned before use and filled after being dried. The front end of the device is a photocatalysis unit, which is formed by 4 honeycomb TiO blocks 2 The plate (600 mm multiplied by 380mm multiplied by 10 mm) is composed of 4 UV lamp tubes (436 mm multiplied by 23 mm), and the power of the UV lamp tube is 17W; the electromagnetic composite field is composed of a direct current electric field embedded in a mutual attraction magnetic field. The total magnetic field is placed for 12 blocks, the material is ferrite, the specification is 150mm multiplied by 100 multiplied by 5mm, and the magnetic field strength is measured to be 35mT; the electric field consisted of two graphite plates (600 mm. Times.380 mm. Times.10 mm) connected to a 3.7V regulated current. As shown in fig. 2, the control group Vertical Flow Constructed Wetland (VFCW) was consistent with PEM-VFCW except for the absence of light catalyst and electromagnetic field. After the experimental device is built and runs stably for 14 days, sampling is started to perform the test.
1.2 Experimental design
The experimental water is campus domestic sewage, and is taken from a sewage treatment station of southwest forestry university, and the water quality fluctuation is large, as shown in table 2. The hydraulic retention time of the constructed wetland is designed mainly with reference to HJ 2005-2010 'constructed wetland sewage treatment engineering technical Specification', the influence of the inlet water pollution load and the operation time on the removal of pollutants of the constructed wetland is comprehensively considered, and the pollution load removal efficiency with the operation time of 24h, 48h and 72h is mainly monitored. The experimental period is 72h, and the sampling interval is 24h. Taking out the water sample at the water outlet of the wetland, and immediately putting the water sample into a refrigerator at 4 ℃ for detecting the concentration of each pollutant. Each pollution load experiment was repeated 3 times and averaged. In order to reduce experimental errors, residual water in the constructed wetland is emptied after each period is completed, so that the influence of the original water is reduced.
Table 2 experiment of the quality of the incoming water
1.3 high throughput sequencing of substrate microorganisms
Extracting total DNA according to E.Z.N.A.soil kit by using 30-50ng DNA as a template, and detecting the concentration and purity of the DNA by utilizing Nano Drop 2000; detecting the DNA extraction quality by using 1% agarose gel electrophoresis; PCR amplification was performed with the 338F (5'-ACTCCTACGGGAGGCAGCAG-3') and 806R (5 '-GGACTACHVGGGTWTCTAAT-3') primer pair V3-V4 variable regions. Double-ended (Paired-end) sequencing was performed using an IlluminaMiSeq sequencing platform, aligned with the Siva 132 database, species taxonomic analysis was performed on the OTU representative sequence using RDP classifier (rbosoma databaseprogram) bayesian algorithm, and the community composition of each sample was counted at different species classification levels.
2. Results and discussion
2.1 Water quality of Water entering and exiting from wetland under different pollution loads
2.1.1COD and NH4+ -N effluent quality
As can be seen from fig. 7: PEM-VFCW is specific to COD and NH at different pollution loads 4 + The removal effect of the two pollutants of the N type is better than that of the VFCW. PEM-VFCW can reach the secondary standard at each concentration [15] Along with the increase of COD concentration of the inflow water of the experimental group, the treatment effect of PEM-VFCW on COD is gradually improved; wherein, the concentration of the VFCW water for removing COD is 127.75mg/L, which can reach the first level standard. For NH 4 + The removal effect of N, PEM-VFCW reaches the first level discharge standard at each water inlet concentration of the experimental group, and NH is treated 4 + The water body with the N content lower than 30mg/L has excellent removing effect; VFCW does not meet the emission standard and as the concentration increases, NH is measured 4 + The poorer the removal of N. Taken together, PEM-VFCW vs. COD and NH 4 + N has better processing capacity under various pollution loads.
2.1.2TP and PO 4 3 P concentration
As can be seen from fig. 8: under different pollution loads, the PEM-VFCW pairs TP and PO 4 3 The removal effect of P is better than VFCW. When the TP concentration in the inflow water of the experimental group is lower than 2.00mg/L, the water outlet concentration of the PEM-VFCW can reach the first-level standard, and when the concentration is higher than 2.00mg/L, the water outlet concentration of the PEM-VFCW can reach the second-level standard; the VFCW division can only reach the first level standard when the degree is higher than 2.00 mg/L. For the removal of the TP(s),the removal effect of the PEM-VFCW is gradually improved along with the increment of the concentration of the water inlet, and the VFCW has no obvious change; for PO 4 3 The removal of P, both different wetlands maintain a similar trend. However, PEM-VFCW fails to improve P removal efficiency, which may be due to too low a field strength of attraction (35 mT) set by this test.
In conclusion, the PEM-VFCW cannot obviously improve the removal effect of the wetland when treating the phosphorus-containing water body.
2.2 removal efficiency of different residence time wetland
2.2.1 removal efficiency of COD
The removal rate of COD of the two groups of artificial wetlands under different operation time is shown in figure 9, and the removal rate of COD of the two groups of artificial wetlands is gradually improved along with the increase of the operation time except under the condition of the water inlet concentration of 127.75 mg/L; and the concentration of the pollutant in the water inlet is increased, and the removal rate is gradually increased. Under the condition of 24 hours of operation, the average removal rate of PEM-VFCW is improved by 2% compared with the VFCW; under the condition of 48 hours of operation, the average removal rate is improved by 13% compared with the VFCW; under the condition of 72 hours of operation, the average removal rate is improved by 9 percent compared with the VFCW. Through comparison, the removal efficiency of the constructed wetland subjected to physical reinforcement is higher than that of the common wetland under different operation times. This advantage does not change with increasing contaminant concentration. It is also indirectly indicated that PEM-VFCW can improve the degradation treatment efficiency of pollutant COD.
2.2.2 pairs of NH 4 + Removal efficiency of N
NH pairs of two groups of artificial wetlands under different running time 4 + The removal rate of N is shown in FIG. 10, and with the extension of the operation time, two groups of wetlands are subjected to NH 4 + The removal rate of N is gradually increased; with the pollutant NH 4 + Increase in N concentration, PEM-VFCW vs NH 4 + N still maintains a high removal efficiency, while the VFCW tends to decrease slowly. Under the condition of 24 hours of operation, the average removal rate of PEM-VFCW is improved by 35% compared with the VFCW; under the condition of 48 hours of operation, the average removal rate of PEM-VFCW is improved by 38% compared with the VFCW; under the condition of 72h operation, PEM-VFCW is flatThe removal rate is improved by 43% compared with the VFCW. Under the above operation time, the PEM-VFCW has higher removal efficiency compared with the VFCW and is along with the NH of the inlet water 4 + The removal efficiency was also stabilized at 83% at the same time as the N concentration was increased. After the photocatalysis technology, the electric field and the magnetic field technology are coupled with the vertical flow constructed wetland, the method is obviously stronger than the single electrode reinforced constructed wetland and the NH pair of the photocatalysis reinforced constructed wetland 4 + -a removal effect of N.
2.2.3 pairs TP and PO 4 3 -efficiency of P removal
The two groups of artificial wetlands are used for carrying out TP and PO under different operation times 4 3 The removal rate of P is shown in FIG. 11, although the two sets of wetlands are free of contaminants TP and PO as the run time is extended 4 3 The removal rate of P is gradually increased, but for TP and PO 4 3 P removal efficiency compared to COD and NH 4 + -N is poor. Under the condition of 24 hours of operation, the average removal rate of TP by PEM-VFCW is reduced by 1% compared with that of VFCW, and PO is reduced 4 3 The average removal rate of PP was reduced by 23%; under the condition of 48h operation, the average removal rate of TP by PEM-VFCW is 40% equal to that of VFCW, and the average removal rate of TP by PEM-VFCW is equal to that of PO 4 3 The average removal rate of PP was reduced by 8%; under the condition of 72h operation, the average removal rate of TP by PEM-VFCW is improved by 6% compared with that of the VFCW.
When the contaminant concentration is greater than 2.00mg/L, there is a slight increase in the removal rate of the PEM-VFCW, which is then reduced by 48%. Indicating that PEM-VFCW has poor removal efficiency for contaminant phosphorus, but when TP and PO are in the feed water 4 3 It is possible that the removal efficiency increases gradually with P above 2.00 mg/L.
2.3 microbial community analysis
The diversity and abundance of two groups of wetland microorganisms are described by table 3, and the quantified indicators include: ace, chao, shannon and Simpson et al indices, both Ace and Chao indices are used to characterize the abundance of microorganisms, and Ace index (3843) and Chao index (3885) in PEM-VFCW are both higher than VFCW. A larger Shannon value indicates a higher community diversity, while a larger Simpson index indicates a lower community diversity. In each sample, there is no significant difference in Shannon index of PEM-VFCW combined with VFCW; while Simpson indices are all lower than VFCW. It was shown that PEM-VFCW could increase the richness and diversity of microorganisms.
Table 3 two sets of wetland microorganism diversity indices
As can be seen from fig. 12, the microorganisms are mainly distributed in 15 categories. In both sets of wetland substrates, the core categories appear at PEM-VFCW as: the ratio of the Proteus (Proteus, 53.51%), the Curvularia viridis (Chloroflex, 9.80%), the Bluebacteria (Cyanobacteria, 8.73%), the Bacteroides (Bacteroides, 5.95%) and the Plactomycetoma (Plactomycetes, 4.66%) was 82.65% of the total flora; in VFCW, this is expressed as: the ratio of the dominant flora to the total flora is 89.04%, and the anamorphic flora has great advantages in both groups of wetlands. Wherein, the cyanobacteria, the firmicutes, the nitrifying spirales (Nitrospirae) and the Gemmamoniformes (Gemmatimonades) have large difference in the two groups of wetland matrix ratios, and the PEM-VFCW ratios are respectively 8.73 percent, 1.50 percent, 2.82 percent and 0.91 percent; the VFCW duty ratios were 0.13%, 3.08%, 0.15%, and 0.45%, respectively.
As can be seen from fig. 12, dominant bacteria appear at PEM-VFCW: gamma-proteobacteria (21.77%), beta-proteobacteria (Beta-proteobacteria, 15.14%), alpha-proteobacteria (Alpha-proteobacteria, 13.89%), synechococcus cicadae (8.34%) and anaerobic rope bacteria (Anaeronolineae, 4.61%), the dominant bacteria accounts for 63.75%. The VFCW is expressed as: gamma-Proteus (30.96%), beta-Proteus (16.74%), alpha-Proteus (9.72%), anaerobic rope bacteria (12.99%) and Delta-Proteus (Delta-proteobacteria, 3.65%), the dominant bacteria account for 74.06%. Synectococcochycideae, uvularia and Chloracidobacterium have significant differences in the two groups of wetland substrates, with PEM-VFCW of 8.34%, 3.78% and 1.47%, respectively; the VFCW was 0.05%, 0.03% and 0.09%, respectively.
Among the 6 most dominant categories: the Proteus is gram-negative bacteria, can survive in complex environments, has metabolic diversity, and plays an important role in nitrogen circulation and biological removal of organic pollutants. The green bending bacteria have various forms, rich nutrition modes and metabolic pathways, participate in the circulation of N, S besides the circulation of carbon, and play an important role in photosynthesis. Cyanobacteria grow vigorously in N, P rich water, and most of the doors have nitrogen fixation effect. The bacteroidetes has an important effect on biological denitrification, is chemical heterotrophic bacteria, has the capability of decomposing complex organic matters and participates in denitrification. The Fusarium is a barren nutritional bacterium, participates in nitrogen circulation, and takes NH 4 + -N and NO 2 - Oxidation to N 2 . Among the remaining 3 categories of greater variance: the thick-walled bacteria can carry out the metabolic processes of nitrification and denitrification in both aerobic and anaerobic environments. The bacillus can reduce the content of nitrate and nitrite in the water body, thereby improving the water quality. The nitrifying spiral bacteria decompose organic matters in water and reduce NH in water 4 + The N concentration is an important contribution.
By comparing the portal level abundance of microorganisms in two groups of wetland substrates, it can be found that: at the 15 dominant phylum level, only the euonymus and the euglenospora abundance in PEM-VFCW matrix were below 1.00%; in VFCW, the abundance of cyanobacteria and TM7 was also less than 1.00% in addition to the phylum of Agrimonia, the phylum of Verrucomicron. The abundance of the bacteria involved in the denitrification function is higher in the ratio of the bacteria in the two groups of wetland matrixes; the ratio of the nitrifying bacteria of the large difference to the nitrifying bacteria of the helicobacter is 2.02-67.15 times higher than that of the VFCW in the PEM-VFCW.
The result also proves that the two groups of wetlands have obvious denitrification function, and the two groups of wetlands have the advantages of TP and PO 4 3 Poor removal efficiency of P. Among 15 dominant bacteria, the abundance ratio of PEM-VFCW is more than 1.00%, and the abundance ratio of VFCW is less than 1.00% and is 6 types. The abundance of Rhizopus in PEM-VFCW is significantly higher at the class level than at the VFCW level, a phenomenon that may be associated withThe PEM-VFCW is embedded with light ultraviolet light for photocatalysis; synechococcophycideae, chloracidobacteria is significantly different, indicating that PEM-VFCW can increase the abundance of some fungi. The alpha-Proteus, beta-Proteus and gamma-Proteus mainly participate in denitrification and degradation of organic matters; anaerobic rope bacteria also show higher abundance, and most of the bacteria are related to nitrification and nitrification; synechococcophycideae, chloracidobacteria is also relatively abundant in PEM-VFCW, but its mechanism of action is not yet known.
3. Conclusion(s)
Under the physical measures of 17W of UV ultraviolet lamp intensity, 3.7V of voltage intensity and 35mT of magnetic field intensity, hydraulic retention time is 24h, 48h and 72h, hydraulic load is 1.8 mD, a photocatalysis technology, a low-voltage electric field and a low-intensity magnetic field are coupled with a vertical flow constructed wetland, a physical reinforced constructed wetland (PEM-VFCW) and a Vertical Flow Constructed Wetland (VFCW) are designed for testing, and the abundance changes of the retention time, the pollution load and the microorganism of a foundation of the wetland in a gate level and a class level are analyzed, so that the conclusion is as follows:
(1) Constructed wetland PEM-VFCW is specific to pollutants (COD, NH) 4 + The removal efficiency of N) shows a trend of increasing gradually with the extension of the residence time of the water body and the increase of the pollution load of the inlet water; VFCW then shows a tendency for the feed water pollution load to increase and the removal rate to decrease gradually. Compared with the VFCW, when the COD content of the inlet water is higher than 200.00mg/L, the removal rate of the PEM-VFCW is improved by 11.00%; when the concentration is lower than 200.00mg/L, the concentration is improved by 9.00 percent; NH (NH) 4 + At N levels above 30.00mg/L, the removal rate of PEM-VFCW is increased by 49%; when the concentration is lower than 30.00mg/L, the concentration is increased by 29.33 percent. 3 physical measures of photocatalysis, electric field and magnetic field are introduced into the vertical flow constructed wetland, so that the pollution (COD and NH) to pollutants can be improved 4 + -N) removal efficiency.
(2) Constructed wetland PEM-VFCW vs. contaminant (TP, PO) 4 3 The removal efficiency of P) is not significantly improved compared to VFCW, and there is a tendency for the removal rate to increase gradually with increasing hydraulic retention time. When the TP content of the water is higher than 2.00mg/L, the removal rate of the TP by the PEM-VFCW is still stabilized at 43.80% at which time the VFCW gradually drops to 28.00%; inlet water TP content PO 4 3 At P levels below 2.00mg/L, PEM-VFCW is not as efficient as VFCW. PO (Positive oxide) 4 3 P is substantially consistent with the trend of TP. The method shows that 3 physical measures of photocatalysis, electric field and magnetic field are introduced into the vertical flow constructed wetland to treat pollutants (TP, PO) 4 3 The removal of P) is not significantly improved.
(3) Constructed wetland PEM-VFCW can increase the abundance of matrix microorganisms at the phylum level and the class level. At the 15 dominant mycota level, only two types of microorganisms in the PEM-VFCW matrix are less than 1% abundant, and 4 types of VFCW are less than 1.00%; at 15 dominant mycorrhizal levels, the abundance of microorganisms in the PEM-VFCW matrix is higher than 1.00%, and the content of 6 bacteria in the VFCW is lower than 1.00%.
(4) The abundance of the nitrifying budomonas, the nitrifying spira and the cyanobacteria with larger difference in the level of the microbial phylum in the PEM-VFCW is 2.02-67.15 times higher than that of the VFCW; the abundance ratio of nitrifying spiral bacteria and green curved bacteria in PEM-VFCW is 18.8-126 times higher than that of VFCW, and these bacteria are involved in nitrifying and denitrifying reaction of wet land, and are closely related to biological denitrification. The Chloracidobacteria, synechococcophycideae abundance on the microbial level in PEM-VFCW is 16.33-166.80 times higher than that of VFCW, but the function of these two microorganisms in the wetland system is not yet clear.
Although embodiments of the invention have been shown and described, the detailed description is to be construed as exemplary only and is not limiting of the invention as the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and modifications, substitutions, variations, etc. may be made in the embodiments as desired by those skilled in the art without departing from the principles and spirit of the invention, provided that such modifications are within the scope of the appended claims.
Claims (6)
1. A photocatalysis and electromagnetic composite field strengthening vertical flow constructed wetland device is characterized by comprising a photocatalysis device positioned at the front endA unit consisting of 4 honeycomb TiO pieces 2 The plate consists of 4 UV lamps, and the power of the UV lamps is 17W;
the electromagnetic composite field is composed of a magnetic field and an electric field, wherein the magnetic field is composed of 12 ferrite magnetic plates, and the magnetic field strength is 35mT;
the electric field consists of two graphite plates connected with 3.7V of stabilized current;
the vertical flow constructed wetland device is characterized in that one end of the vertical flow constructed wetland device is provided with a water inlet, a valve and a water inlet pipeline connected with the valve are arranged outside the water inlet, the water inlet pipeline is connected with a submersible pump, the other end of the vertical flow constructed wetland device is provided with a water outlet pipeline, and the water outlet pipeline is connected with a water storage barrel for placing the submersible pump.
2. The photocatalytic and electromagnetic composite field-enhanced vertical flow constructed wetland device according to claim 1, wherein said honeycomb-shaped TiO 2 The specifications of the plates were 600mm by 380mm by 10mm.
3. The photocatalytic and electromagnetic composite field-enhanced vertical flow constructed wetland device according to claim 1, wherein the specification of the UV ultraviolet lamp tube is 436mm x 23mm.
4. The photocatalytic and electromagnetic composite field strengthening vertical flow constructed wetland device according to claim 1, wherein the specification of the ferrite magnetic plate is 150mm×100×5mm.
5. The photocatalytic and electromagnetic composite field strengthening vertical flow constructed wetland device according to claim 1, wherein the specification of the graphite plate is 600mm x 380mm x 10mm.
6. The photocatalytic and electromagnetic composite field strengthening vertical flow constructed wetland device according to claim 1, wherein the water outlet pipeline penetrates into the water storage barrel, and is arranged at the opening of the pipe section to be a water outlet.
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