CN106396104B - efficient denitrification type vertical flow constructed wetland and construction method thereof - Google Patents
efficient denitrification type vertical flow constructed wetland and construction method thereof Download PDFInfo
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- 238000011282 treatment Methods 0.000 claims abstract description 113
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 230000001105 regulatory effect Effects 0.000 claims description 44
- 241000283690 Bos taurus Species 0.000 claims description 35
- 210000003608 fece Anatomy 0.000 claims description 35
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- 239000010865 sewage Substances 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 7
- 244000005700 microbiome Species 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000011221 initial treatment Methods 0.000 claims description 5
- 238000011081 inoculation Methods 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 5
- 230000035755 proliferation Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000010871 livestock manure Substances 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 2
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 9
- 239000001301 oxygen Substances 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract description 9
- 241000894006 Bacteria Species 0.000 abstract description 8
- 241000108664 Nitrobacteria Species 0.000 abstract description 6
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2301/04—Flow arrangements
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
the invention provides a high-efficiency denitrified vertical flow artificial wetland and a construction method thereof, wherein a saturated layer and an unsaturated layer are arranged in a treatment tank of the vertical flow artificial wetland, oxygen can be continuously supplied to the deep part of the wetland by circulating wastewater between the saturated layer and the unsaturated layer of the treatment tank on the basis of the denitrification mechanism of the vertical subsurface flow wetland, the requirement of nitrobacteria and denitrifying bacteria on oxygen is met, meanwhile, anaerobic bacteria can also exert the maximum effect in the saturated layer, iron slag is filled in an adjusting tank, and the pH value of the wastewater is adjusted by adjusting the iron slag in the tank, so that the pH value of the wastewater is in the optimal range of the action of the nitrobacteria, nitrosobacteria and anaerobic ammonia bacteria, the anaerobic ammonia oxidation process is more remarkable, and the denitrification effect of the vertical flow artificial wetland is greatly improved.
Description
Technical Field
The invention relates to a wastewater treatment device for nitrogen removal of nitrogen-containing wastewater and a construction technology of the device, and belongs to the field of environmental engineering.
background
Nitrogen is one of the important factors for water eutrophication. A large amount of nitrogen-containing waste water is generated in the processes of food processing, aquatic product culture and the like and is used in agricultural production, and the waste water enters public water to cause water eutrophication. The eutrophication of the water body causes the breeding of a large amount of algae, and oxygen in the atmosphere can not diffuse into the water, so that other organisms in the water body die due to oxygen deficiency, and the ecological system is damaged. The artificial wetland is an ecological system for removing pollutants in water by utilizing the interaction of substrates, microorganisms and plants, and has the characteristics of low investment, low energy consumption, convenient maintenance, good environmental and economic benefits and the like. In recent years, a treatment technology for removing nitrogen in wastewater by using an artificial wetland is widely applied in China. The artificial wetland is divided into a surface flow wetland and a vertical flow wetland, the vertical flow wetland has large load, is not easily influenced by temperature, rainfall, solar radiation and the like, and has obvious treatment effect.
disclosure of Invention
The invention provides a high-efficiency denitrified vertical flow artificial wetland and a construction method thereof, on the basis of the denitrification mechanism of the vertical subsurface flow wetland, oxygen can be continuously supplied to the deep part of the wetland by circulating wastewater between a saturated layer and an unsaturated layer of a treatment tank, the requirement of nitrobacteria and denitrifying bacteria on oxygen is met, meanwhile, in the unsaturated layer, anaerobic bacteria can also exert the maximum effect, the pH value of the wastewater is adjusted by adjusting iron slag in the tank, and the pH value of the wastewater is in the optimal range in which the nitrobacteria, nitrosobacteria and anaerobic ammonia bacteria exert the effect, so that the anaerobic ammonia oxidation process is more remarkable, and the denitrification effect of the wetland is greatly improved.
The invention relates to a construction method of a high-efficiency denitrification vertical flow constructed wetland, which comprises the following steps:
(1) Building a treatment tank and filling a treatment tank substrate: digging the treatment tank at a position close to the sewage source, preferably digging a circular water tank with a radius of 3-50m as the treatment tank, and the water tank depth of the treatment tank is V/3.14 xR according to the formula H2calculating by 1.2-2 times, wherein H is the depth of the pool to be dug, V is the volume of the primary treatment wastewater, and R is the radius of the pool; wherein, the wall and the bottom of the treatment tank can be cast by a steel bar framework and concrete according to the conventional method, so as to ensure firmness and water seepage resistance; filling ordinary stones with the particle size of 0.5-3cm into the finished treatment tank, wherein the thickness of the stones is 80-90% of the depth of the treatment tank, and the stones are spread out to be used as a saturated layer of the treatment tank; then filling stones with the particle size of 3-5cm above the stones of the saturated layer, wherein the thickness of the stones is 5-10% of the depth of the treatment pool, and spreading the stones to be used as the unsaturated layer of the treatment pool;
Building a regulating reservoir and filling a regulating reservoir substrate: digging an adjusting tank at one side close to the treatment tank, preferably digging a round water tank with the radius of 1-5m as the adjusting tank, wherein the depth of the water tank is the same as that of the treatment tank; wherein, the tank wall and the tank bottom of the regulating tank are cast by a steel bar framework and concrete according to a conventional method, so as to ensure firmness and water seepage resistance; filling a regulating reservoir substrate: filling iron ore slag with the particle size of 1-3cm into the regulating tank, wherein the thickness of the iron ore slag is 10-30% of the depth of the regulating tank, and flattening;
In the step, the treatment pool and the treatment pool matrix filling are constructed, and the regulating pool matrix filling are constructed in no sequence; if the regulating pool is built firstly, the building range of the regulating pool can be defined firstly, and then the treatment pool is built according to the position of the regulating pool; or the positions of the regulating pool and the treatment pool are defined at the same time, and then the building is carried out at the same time; in addition, the shape of the treatment tank and the adjusting tank can be any other existing shape besides the circular shape, and the invention is not limited to the shape;
(2) and arranging a water through hole: holes with the diameter of 50-150cm are respectively arranged on the tank wall at the bottom between the treatment tank and the adjusting tank, water outlet holes are arranged on the treatment tank, water inlet holes are arranged on the adjusting tank, and the shape of the holes is preferably a round hole; wherein, the diameters of the round holes arranged on the treatment tank and the adjusting tank can be the same or different; then, communicating the two holes, for example, by using a concrete or anti-aging plastic water pipe with the same diameter and shape as those of the two holes, and arranging a valve to facilitate the opening and closing of the passage;
(3) and (3) microbial proliferation: collecting fresh cow dung, wherein the total amount of the fresh cow dung is 1-1.5 times of the volume of a saturated layer in a treatment tank, subpackaging the fresh cow dung in containers which can be sealed, and simultaneously adding activated sludge collected from a sewage treatment plant into each container, wherein the adding amount of the activated sludge is 1-10% of the volume of the cow dung; stirring uniformly, such as 3-5 times, sealing the container, and placing in 20-40 deg.C environment for anaerobic fermentation for 30-90 days;
(4) and filtering: filtering the cattle manure liquid fermented in the step (3) by using a 20-40-mesh sieve, and collecting filtrate;
(5) Inoculating the microorganism: sealing a water outlet hole of the treatment tank, injecting the cow dung filtrate collected in the step (4) into a saturated layer of the treatment tank, and filling the saturated layer until the saturated layer is full; sealing the upper opening of the treatment tank by using a plastic film for 7-28 days, and discharging the cow dung liquid to finish microbial inoculation;
(6) And wastewater is put in and circulated: and (5) after the step (5) is finished, putting the wastewater to be treated into the regulating tank within 1-3 days, opening a valve between a water outlet of the treatment tank and a water inlet of the regulating tank, and continuously and directly pumping the wastewater in the regulating tank into an unsaturated layer of the treatment tank by using a water pump so as to circulate the wastewater between the treatment tank and the regulating tank, wherein the hourly circulation amount of the wastewater is 5-20% of the total wastewater amount, and the denitrification of the wastewater can be finished within 3-7 days.
the invention relates to a high-efficiency denitrification type vertical flow constructed wetland which comprises a treatment tank and an adjusting tank which are communicated at the bottom in a controllable manner, wherein the treatment tank comprises a saturated layer and an unsaturated layer, the saturated layer is 80-90% of the depth of the treatment tank and is filled with common stones with the particle size of 0.5-3cm, the unsaturated layer is 5-10% of the depth of the treatment tank and is formed by the stones with the particle size of 3-5cm, which are filled above the stones in the saturated layer, iron ore slag is filled in the adjusting tank, the iron ore slag is 10-30% of the depth of the adjusting tank and has the particle size of 1-3cm, and the liquid level of wastewater to be treated is positioned in the unsaturated layer of the treatment tank.
Compared with the prior art, the invention has the following beneficial effects:
The high-efficiency denitrification vertical flow constructed wetland and the construction method thereof utilize the denitrification capacity of the vertical subsurface flow wetland, and the circulation of the wastewater between the saturated layer and the unsaturated layer enables oxygen to be continuously supplied to the deep part of the wetland from a source, thereby meeting the requirements of nitrobacteria and denitrifying bacteria on the oxygen; the high-efficiency denitrification vertical flow constructed wetland has the advantages of less investment, quick response, ecological environmental protection and the like.
of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The present invention is further described in detail by the following examples, which are not intended to limit the scope of the present invention.
Example 1
the high-efficiency denitrification vertical flow constructed wetland and the construction method thereof provided by the embodiment are as follows:
(1) building a treatment pool: digging a circular pool with the radius of 3m at a position close to a sewage source, wherein the depth of the circular pool is V/3.14 multiplied by R according to the formula H2Calculating x 1.2, wherein H is the depth of the pool to be dug, V is the volume of the primary treatment wastewater, and R is the radius of the pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a treatment tank;
(2) filling a treatment pool matrix: filling common stones with the particle size of 0.5cm into the treatment tank completed in the step (1), wherein the thickness of the stones is 80% of the depth of the treatment tank, and the stones are spread out to be used as a saturated layer of the treatment tank; then filling stones with the particle size of 3cm above the stones of the saturated layer, wherein the thickness of the stones is 10% of the depth of the treatment pool, and the stones are spread out to be used as the unsaturated layer of the treatment pool;
(3) building a regulating reservoir: digging one circular water pool with the radius of 1m at one side close to the treatment pool in the step (1), wherein the depth of the water pool is the same as that of the treatment pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a regulating tank;
(4) filling a regulating reservoir substrate: filling iron slag with the particle size of 1cm into the regulating tank finished in the step (3), wherein the thickness of the iron slag is 10% of the depth of the regulating tank, and flattening;
(5) And arranging a water through hole: round holes with the diameter of 50cm (water outlet holes on the treatment tank and water inlet holes on the adjusting tank) are respectively arranged on two tank walls at the bottom position between the two tanks finished in the step (1) and the step (3), and then the two tank walls are connected by concrete or anti-aging plastic water pipes with the same diameter as the two round holes, and valves are arranged for opening and closing;
(6) and (3) microbial proliferation: collecting fresh cow dung, wherein the total amount of the fresh cow dung is 1 time of the volume of the saturated layer in the step (2), subpackaging the fresh cow dung in containers which can be sealed, and simultaneously adding activated sludge collected from a sewage treatment plant into each container, wherein the adding amount of the activated sludge is 1 percent of the volume of the cow dung; stirring for 3 times, sealing the container, and anaerobic fermenting at 40 deg.C for 30-90 days;
(7) And filtering: filtering the cattle manure liquid fermented in the step (6) by using a 20-mesh sieve, and collecting filtrate;
(8) Inoculating the microorganism: sealing the water outlet hole of the treatment tank completed in the step (2), and then injecting the cow dung liquid collected in the step (7) into the saturated layer of the treatment tank in the step (2) until the saturated layer is filled; sealing the upper opening of the treatment tank by using a plastic film for 28 days, and then discharging the cow dung liquid to finish microbial inoculation;
(9) and wastewater is put in and circulated: and (4) after the step (8) is finished, putting the wastewater to be treated into the regulating tank within 1 day, opening a valve between the two tanks, continuously pumping the wastewater in the regulating tank into an unsaturated layer of the treatment tank by using a water pump, circulating the wastewater between the two tanks, wherein the circulating amount per hour is 5% of the total wastewater amount, and finishing denitrification of the wastewater within 7 days.
Example 2
The high-efficiency denitrification vertical flow constructed wetland and the construction method thereof provided by the embodiment are as follows:
(1) building a treatment pool: digging a circular pool with the radius of 30m at a position close to a sewage source, wherein the depth of the pool is V/3.14 multiplied by R according to the formula H2calculating the multiplied by 1.5, wherein H is the depth of the pool to be dug, V is the volume of the primary treatment wastewater, and R is the radius of the pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a treatment tank;
(2) Filling a treatment pool matrix: filling common stones with the particle size of 1.5cm into the treatment tank completed in the step (1), wherein the thickness of the stones is 85% of the depth of the treatment tank, and the stones are spread out to be used as a saturated layer of the treatment tank; then filling stones with the particle size of 4cm above the stones of the saturated layer, wherein the thickness of the stones is 8% of the depth of the treatment pool, and the stones are spread out to be used as the unsaturated layer of the treatment pool;
(3) building a regulating reservoir: digging one circular water pool with the radius of 2m at one side close to the treatment pool in the step (1), wherein the depth of the water pool is the same as that of the treatment pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a regulating tank;
(4) Filling a regulating reservoir substrate: filling iron slag with the particle size of 2cm into the regulating tank finished in the step (3), wherein the thickness of the iron slag is 20% of the depth of the regulating tank, and flattening;
(5) and arranging a water through hole: round holes with the diameter of 100cm are respectively arranged on two pool walls at the bottom position between the two pools which are finished in the step (1) and the step (3), a water outlet hole is arranged on the treatment pool, a water inlet hole is arranged on the adjusting pool, and then a concrete or anti-aging plastic water pipe with the same diameter as the two round holes is used for connection, and a valve is arranged for facilitating opening and closing;
(6) and (3) microbial proliferation: collecting fresh cow dung, wherein the total amount of the fresh cow dung is 1.2 times of the volume of the saturated layer in the step (2), subpackaging the fresh cow dung in containers which can be sealed, and simultaneously adding activated sludge collected from a sewage treatment plant into each container, wherein the adding amount of the activated sludge is 5% of the volume of the cow dung; stirring for 4 times, sealing the container, and placing in an environment of 30 deg.C for anaerobic fermentation for 60 days;
(7) and filtering: filtering the cattle manure liquid fermented in the step (6) by using a 30-mesh sieve, and collecting filtrate;
(8) inoculating the microorganism: sealing the water outlet hole of the treatment tank completed in the step (2), and then injecting the cow dung liquid collected in the step (7) into the saturated layer of the treatment tank in the step (2) until the saturated layer is filled; sealing the upper opening of the treatment tank by using a plastic film for 14 days, and then discharging the cow dung liquid to finish microbial inoculation;
(9) And wastewater is put in and circulated: and (8) after the step (8) is finished, putting the wastewater to be treated into the regulating tank within 2 days, opening a valve between the two tanks, continuously pumping the wastewater in the regulating tank into an unsaturated layer of the treatment tank by using a water pump, circulating the wastewater between the two tanks, wherein the circulating amount per hour is 10% of the total wastewater amount, and finishing denitrification of the wastewater within 5 days.
example 3
the high-efficiency denitrification vertical flow constructed wetland and the construction method thereof provided by the embodiment are as follows:
(1) building a treatment pool: digging a circular pool with the radius of 50m at a position close to a sewage source, wherein the depth of the circular pool is V/3.14 multiplied by R according to the formula H2calculating x 2, wherein H is the depth of the pool to be excavated, V is the volume of the primary treatment wastewater, and R is the radius of the pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a treatment tank;
(2) Filling a treatment pool matrix: filling common stones with the particle size of 3cm into the treatment tank completed in the step (1), wherein the thickness of the stones is 90% of the depth of the treatment tank, and the stones are spread out to be used as a saturated layer of the treatment tank; then filling stones with the particle size of 5cm into the stones of the saturated layer, wherein the thickness of the stones is 10% of the depth of the treatment pool, and the stones are spread out to be used as the unsaturated layer of the treatment pool;
(3) building a regulating reservoir: digging one circular water pool with the radius of 5m at one side close to the treatment pool in the step (1), wherein the depth of the water pool is the same as that of the treatment pool; the tank wall and the tank bottom are cast by using a steel bar framework and concrete according to a conventional method, so that the tank wall and the tank bottom are firm and water-proof and serve as a regulating tank;
(4) filling a regulating reservoir substrate: filling iron slag with the particle size of 3cm into the regulating tank finished in the step (3), wherein the thickness of the iron slag is 30% of the depth of the regulating tank, and flattening;
(5) and arranging a water through hole: round holes with the diameter of 150cm are respectively arranged on two pool walls at the bottom position between the two pools which are finished in the step (1) and the step (3), a water outlet hole is arranged on the treatment pool, a water inlet hole is arranged on the adjusting pool, and then a concrete or anti-aging plastic water pipe with the same diameter as the two round holes is used for connection, and a valve is arranged for facilitating opening and closing;
(6) And (3) microbial proliferation: collecting fresh cow dung, wherein the total amount of the fresh cow dung is 1.5 times of the volume of the saturated layer in the step (2), subpackaging the fresh cow dung in containers which can be sealed, and simultaneously adding activated sludge collected from a sewage treatment plant into each container, wherein the adding amount of the activated sludge is 10% of the volume of the cow dung; stirring for 5 times, sealing the container, and placing in an environment of 20 deg.C for anaerobic fermentation for 90 days;
(7) And filtering: filtering the cow dung liquid fermented in the step (6) by using a 40-mesh sieve, and collecting filtrate;
(8) inoculating the microorganism: sealing the water outlet hole of the treatment tank completed in the step (2), and then injecting the cow dung liquid collected in the step (7) into the saturated layer of the treatment tank in the step (2) until the saturated layer is filled; sealing the upper opening of the treatment tank by using a plastic film for 28 days, and then discharging the cow dung liquid to finish microbial inoculation;
(9) And wastewater is put in and circulated: and (8) after the step (8) is finished, putting the wastewater to be treated into the regulating tank within 3 days, opening a valve between the two tanks, continuously pumping the wastewater in the regulating tank into an unsaturated layer of the treatment tank by using a water pump, circulating the wastewater between the two tanks, wherein the circulating amount per hour is 20% of the total wastewater amount, and finishing denitrification of the wastewater within 7 days.
the treatment tank is provided with an unsaturated layer (the upper part of the unsaturated layer is not completely immersed by the wastewater) and a saturated layer (the lower part of the unsaturated layer is always immersed by the wastewater), the unsaturated layer is mainly used for air circulation, the oxygen content on the surface of the wastewater is increased, and sufficient oxygen is provided for aerobic nitrifying bacteria and nitrosobacteria, so that the nitrification and nitrosation capabilities of the aerobic nitrifying bacteria and nitrosobacteria are improved, and the lower saturated layer does not have air to enter, so that an anoxic space is formed, and convenience is provided for anaerobic ammonia oxidizing bacteria. The arrangement of the unsaturated layer and the saturated layer in the treatment tank improves the denitrification efficiency of the constructed wetland on the wastewater.
the invention adds the iron slag into the adjusting tank for adjusting the pH value of the wastewater to ensure that the wastewater is in the optimal range of the function of nitrobacteria, nitrosobacteria and anaerobic ammonia bacteria, thereby improving the denitrification efficiency.
the vertical subsurface flow wetland is constructed by the special design, so that the denitrification function of microorganisms is greatly improved, and the vertical subsurface flow wetland has the advantages of low investment, quick response, ecological environmental protection and the like.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. a construction method of a high-efficiency denitrification vertical flow constructed wetland is characterized by comprising the following steps:
(1) building a treatment tank and filling a treatment tank substrate: digging the treatment tank at a position close to a sewage source, and making the bottom and the wall of the treatment tank firm and impermeable; then, filling common stones with the grain diameter of 0.5-3cm into the treatment pool, wherein the thickness of the stones is 80-90% of the depth of the treatment pool, and the stones are spread out to be used as a saturated layer of the treatment pool; then filling stones with the particle size of 3-5cm above the stones of the saturated layer, wherein the thickness of the stones is 5-10% of the depth of the treatment pool, and spreading the stones to be used as the unsaturated layer of the treatment pool;
Building a regulating reservoir and filling a regulating reservoir substrate: digging an adjusting tank at one side close to the treatment tank, wherein the depth of the adjusting tank is the same as that of the treatment tank, and the bottom and the wall of the adjusting tank are firm and impermeable; filling iron ore slag with the particle size of 1-3cm into the regulating tank, wherein the thickness of the iron ore slag is 10-30% of the depth of the regulating tank, and flattening;
(2) And arranging a water through hole: holes are respectively arranged on the tank wall at the bottom between the treatment tank and the adjusting tank, water outlets are arranged on the treatment tank, and water inlets are arranged on the adjusting tank; then, communicating the two holes and arranging a valve;
(3) and (3) microbial proliferation: collecting fresh cow dung, wherein the total amount of the fresh cow dung is 1-1.5 times of the volume of a saturated layer in a treatment tank, subpackaging the fresh cow dung in containers which can be sealed, and simultaneously adding activated sludge collected from a sewage treatment plant into each container, wherein the adding amount of the activated sludge is 1-10% of the volume of the cow dung; stirring, sealing the container, and anaerobic fermenting at 20-40 deg.C for 30-90 days;
(4) and filtering: filtering the cattle manure liquid fermented in the step (3) by using a 20-40-mesh sieve, and collecting filtrate;
(5) inoculating the microorganism: sealing a water outlet hole of the treatment tank, injecting the cow dung filtrate collected in the step (4) into a saturated layer of the treatment tank, and filling the saturated layer until the saturated layer is full; sealing the upper opening of the treatment tank by using a plastic film for 7-28 days, and discharging the cow dung liquid to finish microbial inoculation;
(6) And wastewater is put in and circulated: and (5) after the step (5) is finished, putting the wastewater to be treated into the regulating tank within 1-3 days, opening a valve between a water outlet of the treatment tank and a water inlet of the regulating tank, and continuously and directly pumping the wastewater in the regulating tank into an unsaturated layer of the treatment tank by using a water pump so as to circulate the wastewater between the treatment tank and the regulating tank, wherein the hourly circulation amount of the wastewater is 5-20% of the total wastewater amount, and the denitrification of the wastewater can be finished within 3-7 days.
2. the method for constructing a high-efficiency denitrification vertical-flow constructed wetland according to claim 1, wherein the treatment tank is a circular water tank with a radius of 3-50m, and the depth of the water tank of the treatment tank is as defined in the formula H = V/3.14 xr2and (1.2 ~ 2 times) calculating, wherein H is the depth of the pool to be dug, V is the volume of the primary treatment wastewater, and R is the radius of the pool.
3. The method for constructing a high-efficiency denitrification type vertical flow constructed wetland according to claim 1, wherein the conditioning tank is a circular water tank with a radius of 1-5 m.
4. the method for constructing the high-efficiency denitrification type vertical flow constructed wetland according to claim 1, wherein the water outlet of the treatment tank and the water inlet of the adjusting tank are both circular holes with the diameter of 50-150 cm.
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| CN111410365A (en) * | 2020-04-01 | 2020-07-14 | 中国科学院生态环境研究中心 | Sanitary drainage and pollution treatment method |
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| WO2010041246A1 (en) * | 2008-10-07 | 2010-04-15 | Moshe Elazar Ernest | A system and method for processing and reusing graywater including for use in a home and garden |
| CN103449608B (en) * | 2013-07-19 | 2014-12-03 | 合肥工业大学 | Novel vertical flow automatic aeration annular artificial wetland system |
| CN204211541U (en) * | 2014-08-29 | 2015-03-18 | 暨南大学 | The vertical marsh sewage treatment system of a kind of backflow |
| CN104556563A (en) * | 2014-12-15 | 2015-04-29 | 华中农业大学 | Terraced constructed wetland depth denitrification processing device |
| CN105293711A (en) * | 2015-11-25 | 2016-02-03 | 常州大学 | Construction method of immersed vertical flow artificial wetland for digesting tail water from urban sewage plant |
| CN105984957A (en) * | 2016-01-22 | 2016-10-05 | 安徽建筑大学 | Constructed wetland treatment method for ammonia-nitrogen wastewater |
| CN205687651U (en) * | 2016-06-07 | 2016-11-16 | 厦门优九生态科技有限公司 | A kind of tidal flow artificial wetland |
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