CN107473388B - Enhanced nitrogen and phosphorus removal integrated artificial wetland system and sewage treatment method thereof - Google Patents
Enhanced nitrogen and phosphorus removal integrated artificial wetland system and sewage treatment method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an enhanced nitrogen and phosphorus removal integrated artificial wetland system which comprises a primary artificial wetland tank and a secondary artificial wetland tank, wherein the upper end of one side of the primary artificial wetland tank is provided with a first water inlet pipe, the lower end of the primary artificial wetland tank is provided with a second water inlet pipe, a first pebble layer, an enhanced nitrogen removal medium layer and a first soil layer are sequentially arranged in the primary artificial wetland tank from bottom to top, and a plurality of vent pipes are also arranged in the primary artificial wetland tank; the reinforced denitrification medium layer is prepared from zeolite, perlite powder, coconut shell cellulose and humus; and a second pebble layer, a reinforced phosphorus removal medium layer and a second soil layer are sequentially arranged in the secondary artificial wetland tank from bottom to top, and the reinforced phosphorus removal medium layer is prepared by mixing steel slag, modified fly ash ceramsite and furfural slag. The invention constructs the enhanced denitrification area and the enhanced dephosphorization area, has ideal synchronous treatment effect on low-pollution water with low carbon-nitrogen ratio and nitrogen and phosphorus pollution, and the nitrogen and phosphorus indexes of the effluent are superior to the IV standard of surface water.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an enhanced nitrogen and phosphorus removal integrated artificial wetland system and a sewage treatment method thereof.
Background
At present, water eutrophication caused by excessive input of nitrogen and phosphorus is one of the main problems of lake water environment. Along with the improvement of the sewage treatment rate and the treatment level, the pollution load of the low-pollution water which reaches the standard and is discharged to the lake water environment is more and more prominent. Although most of the low-pollution water can reach the national water quality discharge standard, the content of nitrogen and phosphorus in the low-pollution water is still several times or even more than ten times higher than the surface water quality standard, and the direct discharge of the low-pollution water has a large water amount and great threat to the natural water body of the lake, so that the treatment is urgently needed.
In low-pollution water, tail water of a sewage treatment plant, farmland runoff and other low-pollution water with low carbon-nitrogen ratio are more concerned, and after the tail water of the sewage treatment plant is subjected to biochemical treatment, the carbon-nitrogen ratio is reduced to 2.5-3; the organic carbon source content in the farmland runoff is also lower. Therefore, low pollution water treatment with low carbon to nitrogen ratio has become a bottleneck problem for treatment.
The artificial wetland sewage treatment system is a comprehensive ecological sewage treatment system, has the advantages of impact load resistance, stable effluent quality, low capital construction operating cost, easy maintenance and the like, and is often used for treating low-pollution water. However, when low-pollution water polluted by low carbon nitrogen and nitrogen phosphorus is treated, the problems of poor denitrification effect of microorganisms, low phosphorus adsorption capacity of fillers and the like caused by insufficient organic carbon source still exist.
Disclosure of Invention
The invention aims to provide an enhanced nitrogen and phosphorus removal integrated constructed wetland system, which solves the problems of poor microbial nitrogen removal effect and low phosphorus adsorption capacity of a filler due to insufficient organic carbon source when the constructed wetland is used for treating low-pollution water polluted by nitrogen and phosphorus with a low carbon-nitrogen ratio in the prior art.
The invention provides an enhanced nitrogen and phosphorus removal integrated artificial wetland system, which comprises a primary artificial wetland pool and a secondary artificial wetland pool which are sequentially arranged along the water flow direction, wherein the upper end of one side of the primary artificial wetland pool is provided with a first water inlet pipe, the lower end of the primary artificial wetland pool is provided with a second water inlet pipe, a first pebble layer, an enhanced nitrogen removal medium layer and a first soil layer are sequentially arranged in the primary artificial wetland pool from bottom to top, a first water distribution pipe is arranged above the first soil layer and is communicated with the first water inlet pipe, a second water distribution pipe is arranged below the first pebble layer and is communicated with the second water inlet pipe; a plurality of vent pipes are inserted into the first-stage artificial wetland pool and the first soil layer, a first water outlet pipe is further arranged above one side of the first-stage artificial wetland pool, which is opposite to the first water inlet pipe, and the first water outlet pipe is positioned above the first water inlet pipe;
wherein the reinforced denitrification medium layer is prepared from zeolite, perlite powder, coconut shell cellulose and humus according to the weight ratio of 30: 10: 1: 1, mixing and preparing;
the second-stage artificial wetland pool is communicated with the first-stage artificial wetland pool through the first water outlet pipe, a second pebble layer, a reinforced phosphorus removal medium layer and a second soil layer are sequentially arranged in the second-stage artificial wetland pool from bottom to top, a third water distribution pipe is arranged above the second soil layer, and the third water distribution pipe is communicated with the first water outlet pipe; a second water outlet pipe is further arranged below one side of the secondary artificial wetland pool, which is opposite to the first water outlet pipe;
wherein the reinforced phosphorus removal medium layer is prepared from steel slag, modified fly ash ceramsite and furfural slag according to the weight ratio of 20: 10: 1, and mixing the components according to the mass ratio.
Preferably, the particle diameters of the pebbles filled in the first pebble layer and the second pebble layer are both 5-10 cm.
Preferably, the first water distribution pipe, the second water distribution pipe and the third water distribution pipe are perforated water distribution pipes provided with cross-shaped holes.
Preferably, emergent aquatic plants are planted in the first loam layer, and the emergent aquatic plants are one of reed, bamboo reed and rhizoma acori graminei.
Preferably, submerged plants are planted in the second loam layer, and the submerged plants are one of fish algae, hydrilla verticillata, elodea nutans and potamogeton ricini.
Preferably, the preparation method of the modified fly ash ceramsite is as follows:
mixing limestone, fly ash and zeolite according to the proportion of 10: 2: 1, grinding the mixture into powder, sieving the powder by a sieve of 80 meshes to obtain a mixed material, adding water into the mixed material, stirring the mixed material by a glass rod while adding water to form paste, preparing the pasty material into spherical particles with the particle size of 5mm, naturally drying the particles, drying the particles at 100 ℃, then placing the particles in a muffle furnace, firing the particles at 650 ℃ for 30min, and cooling the particles to room temperature after firing to obtain the modified limestone ceramsite.
The second purpose of the invention is to provide a method for treating sewage by using an enhanced nitrogen and phosphorus removal integrated artificial wetland system, which comprises the following steps:
step 1, sewage enters the one-level artificial wetland pool through the first water inlet pipe in a following vertical flow mode, and simultaneously sewage enters the one-level artificial wetland pool through the second water inlet pipe in an following vertical flow mode, and the volume ratio of the water inflow of the first water inlet pipe to the water inflow of the second water inlet pipe is 1: 3, controlling the HRT in the primary artificial wetland tank to be 10-12h and the hydraulic load to be 0.3-0.6m3/m2D, obtaining the effluent of the primary constructed wetland pool after the reaction is finished;
step 2, the effluent of the first-stage artificial wetland pool enters a second-stage artificial wetland pool through a first water outlet pipe, the HRT in the second-stage artificial wetland pool is controlled to be 8-10h, and the hydraulic load is controlled to be 0.1-0.2m3/m2And d, obtaining the effluent of the secondary artificial wetland pool after the reaction is finished.
Compared with the prior art, the invention has the beneficial effects that:
(1) in addition, the invention arranges the vent pipe in the primary artificial wetland tank to provide oxygen, strengthen the formation of an aerobic-anoxic zone in the primary artificial wetland tank and facilitate the further removal of nitrogen.
(2) According to the invention, the reinforced phosphorus removal medium layer is arranged in the secondary artificial wetland tank, and the steel slag, the modified fly ash ceramsite and the furfural slag in the reinforced phosphorus removal medium layer are used for adsorbing and removing phosphorus in the sewage, so that the operation is simple and the treatment effect is good.
(3) The invention constructs the enhanced denitrification area and the enhanced dephosphorization area, has ideal synchronous treatment effect on low-pollution water with low carbon-nitrogen ratio and nitrogen and phosphorus pollution, and the nitrogen and phosphorus indexes of the effluent are superior to the IV standard of surface water.
Drawings
FIG. 1 is a schematic structural diagram of an enhanced nitrogen and phosphorus removal integrated constructed wetland system of the invention.
Description of reference numerals:
1-a first water inlet pipe, 2-a second water inlet pipe, 3-a first pebble layer, 4-a reinforced denitrification medium layer, 5-a first soil layer, 6-a first water distribution pipe, 7-a second water distribution pipe, 8-a vent pipe, 9-a first water outlet pipe, 10-a second pebble layer, 11-a reinforced dephosphorization medium layer, 12-a second soil layer, 13-a third water distribution pipe and 14-a second water outlet pipe.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention.
The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified.
Example 1
The utility model provides an strengthen nitrogen and phosphorus removal integration constructed wetland system, specifically as shown in figure 1, includes one-level constructed wetland pond and second grade constructed wetland pond that set gradually along the rivers direction, and the upper end of one-level constructed wetland pond one side is equipped with first inlet tube 1, and the lower extreme is equipped with second inlet tube 2, is equipped with first cobble layer 3, intensive denitrification dielectric layer 4 and first soil layer 5 in proper order by from bottom to top in the one-level constructed wetland pond. The upper end in the one-level constructed wetland pond, the lower extreme are intake simultaneously, consequently upper portion region forms first aerobic zone in the one-level constructed wetland pond, and the lower part region forms the second aerobic zone, and the below in first aerobic zone forms first anoxic zone, and the upper portion in second aerobic zone forms the second anoxic zone, and the place of the below in first anoxic zone and the top coincidence in second anoxic zone forms the anaerobic zone. In an aerobic area, ammonia nitrogen in the sewage is converted into nitrate nitrogen and nitrite nitrogen under the action of nitrifying bacteria, and phosphorus accumulating bacteria take a large amount of dissolved orthophosphate from the wastewater to complete the phosphorus accumulating process; reaction liquid in the first aerobic zone descends to enter a first anoxic zone, reaction liquid in the second aerobic zone ascends to enter a second anoxic zone, organic matters in the anoxic zone are further degraded, nitrate nitrogen and nitrite nitrogen in the aerobic zone are converted into nitrogen under the action of denitrifying bacteria in the anoxic zone, then the reaction liquid in the first anoxic zone and the reaction liquid in the second anoxic zone both enter an anaerobic zone, the organic matters are degraded into simple and stable compounds in the anaerobic zone, organic nitrogen is converted into ammonia nitrogen, and polyphosphate in cells is released by polyphosphate accumulating bacteria. The nitrogen and phosphorus removal process can be repeated after nitrogen and phosphorus which are not removed in the ascending reaction liquid descend to the anaerobic-anoxic-aerobic area at the lower part, and the nitrogen and phosphorus removal process can also be repeated after the nitrogen and phosphorus which are not removed in the descending reaction liquid ascend to the anaerobic-anoxic-aerobic area, and the processes are continuously circulated in the primary artificial wetland tank, so that most of nitrogen and phosphorus removal is finally completed.
Along with the reaction, the organic matters in the sewage are greatly consumed and degraded, so that the C/N in the water is reduced, and the survival of microorganisms is difficult to maintain, therefore, the enhanced denitrification medium layer 4 is arranged in the primary artificial wetland pool, and the enhanced denitrification medium layer 4 is prepared from the following components of zeolite, perlite powder, coconut cellulose and humus according to the weight ratio of 30: 10: 1: 1, the particle size of each component in the enhanced denitrification medium layer 4 is 5mm, wherein the coconut shell cellulose and the humus can provide a carbon source for microorganisms in the primary artificial wetland pool, and the growth and the propagation of the microorganisms are facilitated, and the nitrogen treatment is facilitated; the zeolite and the perlite powder can adsorb ammonia nitrogen in the wastewater, and in addition, the perlite powder is hydrophobic, so that the porosity of the enhanced denitrification medium layer 4 can be improved, the wastewater can flow in the enhanced denitrification medium layer 4, and the adsorption effect can be favorably realized.
It should be noted that, a plurality of permeability cells 8 are inserted into the first soil layer 5 in the primary artificial wetland tank, the bottom ends of the permeability cells 8 are located in the first soil layer 5, and the top ends of the permeability cells are higher than the top end of the first soil layer 5, and because no aeration device is arranged in the primary artificial wetland tank, the range of the aerobic zone is small, and only in the limited area at the upper part of the first soil layer 5, and the permeability cells 8 can introduce air into the first soil layer 5, so that the formation of the aerobic zone and the anoxic zone is promoted, and the denitrification effect is enhanced.
Emergent aquatic plant reeds are planted in the first soil layer 5, and the reeds can adsorb and degrade organic matters in the wastewater to a certain degree. A first water distribution pipe 6 is arranged above the first soil layer 5, the first water distribution pipe 6 is communicated with the first water inlet pipe 1, a second water distribution pipe 7 is arranged below the first pebble layer 3, and the second water distribution pipe 7 is communicated with the second water inlet pipe 2; the first water distribution pipe 6 and the second water distribution pipe 7 can make the inlet water uniformly distributed, so that the inlet water can be better contacted with the first pebble layer 3, the enhanced denitrification medium layer 4 and the first soil layer 5.
A first water outlet pipe 9 is also arranged above one side of the first-stage artificial wetland pool opposite to the first water inlet pipe 1, and the first water outlet pipe 9 is positioned above the first water inlet pipe 1; the secondary artificial wetland tank is communicated with the primary artificial wetland tank through a first water outlet pipe 9, and a second pebble layer 10, a reinforced phosphorus removal medium layer 11 and a second soil layer 12 are sequentially arranged in the secondary artificial wetland tank from bottom to top. Because a large amount of organic matters and nitrogen and phosphorus are removed in the first-stage artificial wetland pool, the second-stage artificial wetland pool mainly carries out advanced treatment to further remove the organic matters, nitrogen and phosphorus, so that the water quality is further purified. The enhanced phosphorus removal medium layer 11 is prepared from steel slag, modified fly ash ceramsite and furfural slag according to the weight ratio of 20: 10: 1, and the particle size of each component in the reinforced phosphorus removal dielectric layer 11 is 5mm, wherein the steel slag, the modified fly ash ceramsite and the furfural slag can adsorb nitrogen and phosphorus in wastewater, particularly can efficiently adsorb phosphorus, but a calcium-magnesium-containing oxide in the steel slag reacts with water to generate hydroxide, so that a water body is alkaline, after the furfural slag is added, the acidity of the furfural slag can neutralize the alkalinity, and on the other hand, the hydroxide can modify the furfural slag, so that the adsorption capacity of the furfural slag is enhanced.
Submerged plants, namely fish algae are planted in the second soil layer 12, and the fish algae can adsorb and degrade nitrogen and phosphorus in the wastewater to a certain degree. A third water distribution pipe 13 is arranged above the second soil layer 12, and the third water distribution pipe 13 is communicated with the first water outlet pipe 9; a second water outlet pipe 14 is also arranged at the lower part of one side of the second-stage artificial wetland pool opposite to the first water outlet pipe 9, and the second water outlet pipe 14 discharges the finally treated wastewater.
The particle diameters of the pebbles filled in the first pebble layer 3 and the second pebble layer 10 are both 5-10 cm; the first water distribution pipe 6, the second water distribution pipe 7 and the third water distribution pipe 13 are all cross-shaped perforated water distribution pipes.
Further, the preparation method of the modified fly ash ceramsite is as follows:
mixing limestone, fly ash and zeolite according to the proportion of 10: 2: 1, grinding the mixture into powder, sieving the powder by a sieve of 80 meshes to obtain a mixed material, adding water into the mixed material, stirring the mixed material by a glass rod while adding water to form paste, preparing the pasty material into spherical particles with the particle size of 5mm, naturally drying the particles, drying the particles at 100 ℃, then placing the particles in a muffle furnace, firing the particles at 650 ℃ for 30min, and cooling the particles to room temperature after firing to obtain the modified limestone ceramsite.
The method for treating sewage by using the enhanced nitrogen and phosphorus removal integrated artificial wetland system comprises the following steps:
step 1, preparing artificial simulated wastewater;
step 2, sewage enters the one-level artificial wetland pool through the first water inlet pipe 1 in a downstream vertical flow mode, and simultaneously sewage also enters the one-level artificial wetland pool through the second water inlet pipe 2 in an upstream vertical flow mode, and the volume ratio of the water inflow of the first water inlet pipe 1 to the water inflow of the second water inlet pipe 2 is 1: 3, controlling the HRT in the primary constructed wetland pool to be 10 hours and the hydraulic load to be 0.4m3/m2D, obtaining the effluent of the primary constructed wetland pool after the reaction is finished;
step 3, the effluent of the primary artificial wetland tank enters a secondary artificial wetland tank through a first water outlet pipe 9, the HRT in the secondary artificial wetland tank is controlled to be 9h, and the hydraulic load is controlled to be 0.15m3/m2And d, obtaining the effluent of the secondary artificial wetland pool after the reaction is finished, wherein the effluent quality meets the IV standard of the quality standard of surface water environment (GB 3838-2002).
Example 2
The reinforced nitrogen and phosphorus removal integrated artificial wetland system and the artificial simulated wastewater used in the embodiment 2 are the same as those in the embodiment 1, except that the emergent aquatic plant planted in the embodiment 2 is acorus gramineus and the submerged plant is potamogeton ricini, and the specific implementation steps are as follows:
step 1, passing sewage throughFirst inlet tube 1 gets into one-level artifical wetland pond with the vertical current mode of going downwards, and sewage still gets into one-level artifical wetland pond via the vertical current mode of going upwards of second inlet tube 2 simultaneously to the volume ratio of first inlet tube 1 and 2 inflow of second inlet tube is 1: 3, controlling the HRT in the primary constructed wetland pool to be 11h and the hydraulic load to be 0.6m3/m2D, obtaining the effluent of the primary constructed wetland pool after the reaction is finished;
step 2, the effluent of the primary artificial wetland pool enters a secondary artificial wetland pool through a first water outlet pipe 9, the HRT in the secondary artificial wetland pool is controlled to be 10h, and the hydraulic load is controlled to be 0.2m3/m2And d, obtaining the effluent of the secondary artificial wetland pool after the reaction is finished, wherein the effluent quality meets the IV standard of the quality standard of surface water environment (GB 3838-2002).
Example 3
The reinforced nitrogen and phosphorus removal integrated artificial wetland system and the artificial simulated wastewater used in the embodiment 3 are the same as those in the embodiment 1, except that the emergent aquatic plant planted in the embodiment 3 is giant reed and the submerged plant is hydrilla verticillata, and the specific implementation steps are as follows:
step 1, sewage enters the one-level artificial wetland pool through the first water inlet pipe 1 in a downstream vertical flow mode, and simultaneously sewage enters the one-level artificial wetland pool through the second water inlet pipe 2 in an upstream vertical flow mode, and the volume ratio of the water inflow of the first water inlet pipe 1 to the water inflow of the second water inlet pipe 2 is 1: 3, controlling the HRT in the primary constructed wetland pool to be 12 hours and controlling the hydraulic load to be 0.3m3/m2D, obtaining the effluent of the primary constructed wetland pool after the reaction is finished;
step 2, the effluent of the primary artificial wetland pool enters a secondary artificial wetland pool through a first water outlet pipe 9, the HRT in the secondary artificial wetland pool is controlled to be 8h, and the hydraulic load is 0.1m3/m2And d, obtaining the effluent of the secondary artificial wetland pool after the reaction is finished, wherein the effluent quality meets the IV standard of the quality standard of surface water environment (GB 3838-2002).
The examples 1 to 3 all have better treatment effect on the artificial simulated wastewater, the effluent quality meets the IV standard of surface water environmental quality standard (GB3838-2002), and the specific effluent quality analysis results are shown in the tables 1 to 3.
TABLE 1 first-class quality of effluent from artificial wetland pool
As can be seen from the table 1, the COD concentration in the effluent of the primary artificial wetland pool is reduced from 200mg/L to about 60mg/L, and the removal rate reaches about 74 percent; NH (NH)4 +The N concentration is reduced to about 2mg/L from 35mg/L, and the removal rate reaches about 93 percent; the TN concentration is reduced to about 5mg/L from 50mg/L, and the removal rate reaches about 90 percent; the concentration of TP is reduced from 10mg/L to about 5mg/L, and the removal rate reaches about 48 percent; therefore, the primary artificial wetland tank is provided with two sets of aerobic-anoxic-anaerobic environments from top to bottom and from bottom to top, so that the artificial wetland tank is suitable for the treatment of the wastewater. The COD degradation capability is strong, the removal rate reaches 74%, and more importantly, the two sets of aerobic-anoxic-anaerobic environments are favorable for the nitrification-denitrification reaction, and the nitrification-denitrification reaction is continuously and circularly carried out in the first-stage artificial wetland tank, so the denitrification efficiency is high. In addition, the filler in the reinforced denitrification medium layer can also absorb nitrogen and phosphorus, especially nitrogen to a certain extent, so that the nitrogen can be further denitrified and the water quality can be purified.
TABLE 2 quality of effluent from two-stage constructed wetland tank
As can be seen from the table 2, the COD concentration in the effluent of the secondary artificial wetland pool is reduced from 60mg/L to about 30mg/L, and the removal rate reaches about 50%; NH (NH)4 +The N concentration is reduced from 2mg/L to about 0.7mg/L, and the removal rate reaches about 60 percent; the TN concentration is reduced to about 1mg/L from 5mg/L, and the removal rate reaches about 72 percent; the concentration of TP is reduced from 5mg/L to about 0.2mg/L, and the removal rate reaches about 97 percent; therefore, the secondary artificial wetland pool can be used for COD and NH4 +N, TN, the anaerobic-aerobic microorganisms in the secondary artificial wetland pool can degrade pollutants to further reduce COD and NH4 +-N, TN, the otherIn the aspect, the enhanced phosphorus removal medium layer arranged in the secondary artificial wetland tank can adsorb pollutants, so that the concentration of the pollutants is reduced. More importantly, the reinforced phosphorus removal medium layer has a good adsorption effect on phosphorus, so that the phosphorus removal rate reaches 97% after the treatment of the secondary artificial wetland pool.
TABLE 3 treatment efficiency of enhanced denitrification and dephosphorization integrated artificial wetland system
| Item | COD(％) | NH4 +-N(％) | TN(％) | TP(％) |
| Example 1 | 87.04 | 98.14 | 97.48 | 97.80 |
| Example 2 | 85.97 | 97.97 | 98.04 | 98.50 |
| Example 3 | 85.44 | 97.94 | 97.66 | 97.40 |
As can be seen from Table 2, after the enhanced nitrogen and phosphorus removal integrated artificial wetland system disclosed by the invention is used for treatment, the total removal rate of COD (chemical oxygen demand) reaches more than 85%, and NH (ammonia) is removed4 +The total removal rate of-N reaches about 98%, the total removal rate of TN reaches about 97%, and the total removal rate of TP reaches more than 97%. Therefore, the enhanced nitrogen and phosphorus removal integrated constructed wetland system is suitable for treating sewage with low C/N ratio and low nitrogen and phosphorus concentration, the nitrogen and phosphorus removal effect is ideal, the effluent quality is good, and various indexes such as COD, nitrogen, phosphorus and the like in the effluent are superior to the IV-class level of the surface water environment quality standard (GB 3838-2002).
It should be noted that when the following claims refer to numerical ranges, it should be understood that both ends of each numerical range and any value between the two ends can be selected, and since the steps and methods used are the same as those in embodiments 1-3, the preferred embodiments of the present invention have been described for the purpose of preventing redundancy, but once the basic inventive concept is known, those skilled in the art can make other changes and modifications to these embodiments. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The integrated artificial wetland system for enhanced nitrogen and phosphorus removal is characterized by comprising a primary artificial wetland pool and a secondary artificial wetland pool which are sequentially arranged along the water flow direction, wherein the upper end of one side of the primary artificial wetland pool is provided with a first water inlet pipe (1), the lower end of the primary artificial wetland pool is provided with a second water inlet pipe (2), the primary artificial wetland pool is sequentially provided with a first pebble layer (3), an enhanced nitrogen removal medium layer (4) and a first soil layer (5) from bottom to top, a first water distribution pipe (6) is arranged above the first soil layer (5), the first water distribution pipe (6) is communicated with the first water inlet pipe (1), a second water distribution pipe (7) is arranged below the first pebble layer (3), and the second water distribution pipe (7) is communicated with the second water inlet pipe (2); a plurality of vent pipes (8) are inserted into the first-stage artificial wetland pool and the first soil layer (5), a first water outlet pipe (9) is further arranged above one side of the first-stage artificial wetland pool, which is opposite to the first water inlet pipe (1), and the first water outlet pipe (9) is positioned above the first water inlet pipe (1);
wherein the reinforced denitrification medium layer (4) is prepared from zeolite, perlite powder, coconut shell cellulose and humus according to the weight ratio of 30: 10: 1: 1, mixing and preparing;
the secondary artificial wetland tank is communicated with the primary artificial wetland tank through the first water outlet pipe (9), a second pebble layer (10), a reinforced phosphorus removal medium layer (11) and a second soil layer (12) are sequentially arranged in the secondary artificial wetland tank from bottom to top, a third water distribution pipe (13) is arranged above the second soil layer (12), and the third water distribution pipe (13) is communicated with the first water outlet pipe (9); a second water outlet pipe (14) is further arranged below one side of the secondary artificial wetland pool opposite to the first water outlet pipe (9);
the enhanced phosphorus removal medium layer (11) is prepared from steel slag, modified fly ash ceramsite and furfural slag according to the weight ratio of 20: 10: 1, and mixing the components according to the mass ratio.
2. The integrated artificial wetland system for enhanced nitrogen and phosphorus removal of claim 1, wherein the particle size of the pebbles filled in the first pebble layer (3) and the second pebble layer (10) is 5-10 cm.
3. The enhanced nitrogen and phosphorus removal integrated artificial wetland system of claim 1, wherein the first water distribution pipe (6), the second water distribution pipe (7) and the third water distribution pipe (13) are all water distribution pipes provided with cross-shaped through holes.
4. The integrated artificial wetland system for enhanced nitrogen and phosphorus removal of claim 1, wherein emergent aquatic plants are planted in the first soil layer (5), and the emergent aquatic plants are one of reed, bamboo reed and rhizoma acori graminei.
5. The integrated artificial wetland system for enhanced nitrogen and phosphorus removal of claim 1, wherein submerged plants are planted in the second soil layer (12), and the submerged plants are one of fish algae, hydrilla verticillata, elodea nutans and potamogeton ricini.
6. The enhanced nitrogen and phosphorus removal integrated constructed wetland system of claim 1, wherein the preparation method of the modified fly ash ceramsite is as follows:
mixing limestone, fly ash and zeolite according to the proportion of 10: 2: 1, grinding the mixture into powder, sieving the powder by a sieve of 80 meshes to obtain a mixed material, adding water into the mixed material, stirring the mixed material while adding water to form paste, preparing the paste material into spherical particles with the particle size of 5mm, naturally drying the particles, drying the particles at 100 ℃, then placing the particles in a muffle furnace, firing the particles at 650 ℃ for 30min, and cooling the particles to room temperature after firing to obtain the modified limestone ceramsite.
7. The method for treating sewage by using the enhanced nitrogen and phosphorus removal integrated artificial wetland system of claim 1 is characterized by comprising the following steps of:
step 1, sewage enters a one-level artificial wetland pool through a first water inlet pipe (1) in a downstream vertical flow mode, and simultaneously enters the one-level artificial wetland pool through a second water inlet pipe (2) in an upstream vertical flow mode, and the volume ratio of the water inflow of the first water inlet pipe (1) to the water inflow of the second water inlet pipe (2) is 1: 3, controlling the HRT in the primary artificial wetland tank to be 10-12h and the hydraulic load to be 0.3-0.6m3/m2D, obtaining the effluent of the primary constructed wetland pool after the reaction is finished;
step 2, the effluent of the primary artificial wetland tank enters the secondary artificial wetland through a first water outlet pipe (9)The HRT in the second-stage artificial wetland tank is controlled to be 8-10h, and the hydraulic load is controlled to be 0.1-0.2m3/m2And d, obtaining the effluent of the secondary artificial wetland pool after the reaction is finished.
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| CN108218133B (en) * | 2018-02-07 | 2024-03-12 | 优德太湖水务（苏州）有限公司 | Deep dephosphorization microsystem |
| CN108483671A (en) * | 2018-06-01 | 2018-09-04 | 南京林业大学 | A kind of simulator of artificial wetland treatment rainwater |
| CN111204927A (en) * | 2020-01-17 | 2020-05-29 | 棕榈生态城镇发展股份有限公司 | Ecological public toilet sewage treatment circulating system and sewage treatment and recycling method |
| CN113213706A (en) * | 2021-05-28 | 2021-08-06 | 浙江问源环保科技股份有限公司 | Enhanced dephosphorization combined artificial wetland system utilizing rural biogas digester |
| CN115304219A (en) * | 2022-08-10 | 2022-11-08 | 武汉中科水生环境工程股份有限公司 | Integrated equipment and method suitable for rural sewage treatment |
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