CN110436620B - Synchronous denitrification wetland and treatment process thereof - Google Patents
Synchronous denitrification wetland and treatment process thereof Download PDFInfo
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- CN110436620B CN110436620B CN201910816344.2A CN201910816344A CN110436620B CN 110436620 B CN110436620 B CN 110436620B CN 201910816344 A CN201910816344 A CN 201910816344A CN 110436620 B CN110436620 B CN 110436620B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 239000000463 material Substances 0.000 claims abstract description 77
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims description 16
- 230000001788 irregular Effects 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005273 aeration Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
- C02F3/28—Anaerobic digestion processes
-
- 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
-
- 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
-
- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a synchronous denitrification wetland and a treatment process thereof, belonging to the field of wetlands, wherein the interior of an unsaturated wetland and a saturated wetland sequentially comprise a first main filter layer, a second main filter layer and a water distribution layer from top to bottom, the first main filter layer, the second main filter layer and the water distribution layer are filled with filter materials, the particle sizes of the filter materials of the first main filter layer, the second main filter layer and the water distribution layer are different, the water inlet end of an upper water inlet pipe of the unsaturated wetland is communicated with one water outlet end of a flow divider, and the water inlet end of a lower water inlet pipe of the saturated wetland is communicated with the other water outlet end of the flow divider. The synchronous denitrification treatment process adopts the synchronous denitrification wetland for treatment, and the synchronous denitrification wetland and the treatment process thereof realize total nitrogen removal without carbon sources by combining two wetland settings through split treatment, and have low cost.
Description
Technical Field
The invention belongs to the field of wetlands, and particularly relates to a synchronous denitrification wetland and a treatment process thereof.
Background
The artificial wetland is a technology for treating sewage and sludge by utilizing the physical, chemical and biological triple synergistic effects of soil, artificial medium, plants and microorganisms in the process of flowing sewage and sludge along a certain direction by manually constructing and controlling the ground similar to the swamp, and controlling the sewage and sludge to be dosed on the constructed wetland.
The constructed wetland can remove nitrogen in water, has low energy consumption and is well used for preventing and treating water eutrophication. Existing constructed wetland processes often require a carbon source for treatment. In the process of removing pollutants, the subsurface flow wetland has advantages over the surface flow wetland, the subsurface flow wetland has high load and good NH 3 -N (ammonia nitrogen) removing effect, but the denitrification is blocked at the rear end of the treatment due to the lack of a carbon source, so that the effluent TN (total nitrogen) is higher, and the phenomenon is generally existing in practice and is a great technical problem of the constructed wetland. The existing wetland adopts various methods to solve the problem of adding carbon sources, but has poor effect and poor control, and especially the adding time and adding amount of the carbon sources can cause pollution. In addition, most of the existing denitrification wetlands adopt aeration treatment, and aeration equipment is needed to be additionally arranged, so that the energy consumption is high. The existing denitrification wetland can not realize good removal of total nitrogen and has high cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problem to be solved by the invention is to provide the wetland for synchronous denitrification and the treatment process thereof, and the total nitrogen removal without carbon sources is realized by combining the arrangement of two wetlands through split-flow treatment, so that the cost is low.
To achieve the purpose, the invention adopts the following technical scheme:
The invention provides a synchronous denitrification wetland, which comprises a diverter, an unsaturated wetland and a saturated wetland, wherein the diverter, the unsaturated wetland and the saturated wetland are sequentially arranged along the water inlet direction, the unsaturated wetland and the saturated wetland sequentially comprise a first main filter layer, a second main filter layer and a water distribution layer from top to bottom, the first main filter layer, the second main filter layer and the water distribution layer are filled with filter materials, the particle sizes of the filter materials of the first main filter layer, the second main filter layer and the water distribution layer are different, the water inlet end of a water inlet pipe at the upper part of the unsaturated wetland is communicated with one water outlet end of the diverter, the water inlet end of a water inlet pipe at the lower part of the saturated wetland is communicated with the other water outlet end of the diverter, the water outlet end of a water outlet pipe at the lower part of the saturated wetland is communicated with the water distribution layer of the saturated wetland, and the water outlet pipe at the upper part of the saturated wetland is positioned above the first main filter layer in the saturated wetland.
Preferably, the split ratio of the splitter is 0.9-1.2:1.
Preferably, the shunt comprises a device body, a water inlet pipeline is fixedly communicated with one side wall of the device body, the upper water inlet pipe and the lower water inlet pipe are respectively fixedly communicated with the other side wall of the device body, two diversion areas are arranged in the device body, the space sizes of the two diversion areas are consistent, the two diversion areas are respectively communicated with the upper water inlet pipe and the lower water inlet pipe, a diversion weir plate is fixedly arranged in each diversion area, a plurality of weir openings are formed in the diversion weir plate, and a plurality of adjusting plates for shielding the weir openings are arranged on each diversion weir plate.
Preferably, the particle size of the filter material of the first main filter layer is 4-6mm, the particle size of the filter material of the second main filter layer is 11-15mm, and the particle size of the filter material of the water distribution layer is 18-32mm.
Preferably, the filter material thickness ratio of the first main filter layer to the second main filter layer to the water distribution layer is 1.8-2.2:1.8-2.2:1.
Preferably, the thickness of the filter material of the first main filter layer is 400mm, the thickness of the filter material of the second main filter layer is 400mm, and the thickness of the filter material of the water distribution layer is 200mm.
Preferably, the filter material is ceramic biological filter material or mixed filter material composed of ceramic biological filter material and porous dephosphorization light filter material, wherein the proportion of the porous dephosphorization light filter material in the mixed filter material is 10-15% of the total filter material.
Preferably, the specific surface areas of the ceramic biological filter material and the porous dephosphorizing light filter material are 1260-1750m 2/g, the porosities are 47-55%, and the ceramic biological filter material and the porous dephosphorizing light filter material have irregular surfaces.
Preferably, the water inlet end of the return pipe is fixedly communicated with the lower water outlet pipe, and the water outlet end of the return pipe is fixedly communicated with the upper water inlet pipe.
The invention also provides a synchronous denitrification treatment process, which adopts the wetland for synchronous denitrification according to any one of the above steps for treatment.
The beneficial effects of the invention are as follows:
1. The water containing NH 3 -N (ammonia nitrogen) is shunted to the unsaturated wetland and the saturated wetland in a ratio of about 1:1, the nitrification reaction is carried out in the unsaturated wetland, the produced water of the unsaturated wetland and the water containing NH 3 -N (ammonia nitrogen) shunted by the shunt are subjected to anaerobic ammoxidation reaction in the saturated wetland to form N 2 (nitrogen), the total nitrogen removal rate is high, a carbon source is not needed, the total nitrogen removal without the carbon source is realized, and the cost is low.
2. No aeration equipment and lifting pump are needed, the energy consumption is low, the energy is saved, the environment is protected, and the cost is low.
3. The water outlet quantity of the weir crest is regulated by the regulating plate, so that the water distribution ratio of the upper water inlet pipe and the lower water inlet pipe is adjustable, the precision is high, the operation is simple and convenient, the movable equipment is not increased, the energy consumption is saved, and the cost is low.
4. According to water quality, porous dephosphorization light filter materials can be added for dephosphorization, and the ceramic biological filter materials and the porous dephosphorization light filter materials are particle filter materials with irregular surfaces and high specific surface areas, so that the ceramic biological filter materials and the porous dephosphorization light filter materials have good treatment effects.
Drawings
FIG. 1 is a flow chart of a synchronous denitrification treatment process according to a first embodiment of the present invention.
FIG. 2 is a flow chart of a synchronous denitrification process according to a second embodiment of the present invention.
Fig. 3 is a schematic view showing a front view of a synchronous denitrification wetland according to the first embodiment of the invention.
FIG. 4 is a schematic view showing a front view of a synchronous denitrification wetland according to the second embodiment of the invention.
Fig. 5 is a schematic top view of the diverter of the present invention.
Fig. 6 is a schematic cross-sectional view of A-A of fig. 5.
The marks in the drawings are: 1-unsaturated wetland, 2-saturated wetland, 3-flow divider, 31-device body, 32-inlet pipe, 33-flow dividing area, 34-flow dividing weir plate, 35-weir, 36-regulating plate, 4-first main filter layer, 5-second main filter layer, 6-water distribution layer, 7-upper water inlet pipe, 8-lower water inlet pipe, 9-upper water outlet pipe, 10-return pipe and 11-lower water outlet pipe.
Detailed Description
The invention will now be further described with reference to the drawings and detailed description.
What is not described in detail in this specification is prior art known to those skilled in the art. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or refer to an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Embodiment one:
As shown in fig. 1,3, 5 and 6, the synchronous denitrification wetland provided in this embodiment includes a diverter 3, an unsaturated wetland 1 and a saturated wetland 2 sequentially arranged along the water inlet direction, the saturated wetland 2 is located at the lower right side of the unsaturated wetland 1 from left to right, the unsaturated wetland 1 is one of aerobic type wetland, the saturated wetland 2 is one of anoxic type wetland, the unsaturated wetland 1 in this embodiment is a down-flow vertical flow wetland, aeration is not required, and the saturated wetland 2 is an up-flow vertical flow wetland, aeration is not required. The inside of unsaturated type wetland 1 and saturated type wetland 2 all includes first main filter layer 4, second main filter layer 5, and water distribution layer 6 from top to bottom in proper order, first main filter layer 4, second main filter layer 5, and water distribution layer 6 all are filled with ceramic biological filter material, and the ceramic biological filter material particle diameter of first main filter layer 4, second main filter layer 5, and water distribution layer 6 is different, the water inlet end of the upper inlet tube 7 of unsaturated type wetland 1 communicates with one of them water outlet end of shunt 3, the water inlet end of the lower inlet tube 8 of saturated type wetland 2 communicates with another water outlet end of shunt 3, the water outlet end of the lower inlet tube 8 of saturated type wetland 2 and the water outlet end of the lower outlet tube 11 of unsaturated type wetland 1 all communicate with water distribution layer 6 of saturated type wetland 2, the upper outlet tube 9 of saturated type wetland 2 is located the inside first main filter layer 4 of saturated type wetland 2.
According to the invention, the water body containing NH 3 -N (ammonia nitrogen) is split into the unsaturated wetland 1 and the saturated wetland 2 in a ratio of about 1:1, the nitrification reaction is carried out in the unsaturated wetland 1, the produced water of the unsaturated wetland 1 and the water body containing NH 3 -N (ammonia nitrogen) split by the splitter 3 are subjected to anaerobic ammoxidation reaction in the saturated wetland 2 to form N 2 (nitrogen), and the synchronous treatment is carried out, so that the total nitrogen removal rate is high, a carbon source is not needed, the total nitrogen removal without a carbon source is realized, and the cost is low. The combination mode of the unsaturated wetland 1 and the saturated wetland 2 has higher total nitrogen removal rate than the existing wetland.
Specifically, the diversion ratio of the diverter 3 is 0.9-1.2:1, the diversion ratio of the embodiment is 1:1, after the precipitated water body is diverted by the diverter 3, 50% of the water enters the unsaturated wetland 1 through the upper water inlet pipe 7, and the rest 50% of the water enters the bottom of the saturated wetland 2 through the lower water inlet pipe 8 channel 32. The water flows out from the upper part of the unsaturated wetland 1 and from the lower part, the water body moves up and down in the unsaturated wetland 1, passes through the first main filter layer 4, the second main filter layer 5 and the water distribution layer 6 in sequence, and is subjected to nitration reaction, NH 3 -N (ammonia nitrogen) is converted into substances with NO 3 - (nitrate), substances with NO 3 - formed by different water qualities are different, and in the embodiment, nitric acid and nitrous acid are taken as examples.
The water body after the nitration reaction enters the water distribution layer 6 of the saturated wetland 2 through the lower water outlet pipe 11, namely, the water body containing nitric acid and nitrous acid and the water body containing NH 3 -N (ammonia nitrogen) which is shunted from the shunt 3 generate anaerobic ammoxidation reaction in the saturated wetland 2 to form N 2 (nitrogen) to be discharged, the water body also generates anaerobic ammoxidation reaction in the first main filter layer 4 and the second main filter layer 5 in the saturated wetland 2, water flows out from the upper part of the water inlet below the saturated wetland 2, and the water overflows out after the water outlet is full, so that a lifting pump is not needed, and the energy-saving and environment-friendly effects are realized. Wherein, the surface hydraulic load of the unsaturated wetland 1 is 0.9-1.2 m/(. Cndot. ∙ d), and the surface hydraulic load of the saturated wetland 2 is 0.9-1.2 m/(. Cndot. ∙ d). The total nitrogen removal rate after the wet land (without circulation) treatment of the embodiment is 56.55-73.78%, and the ammonia nitrogen removal rate is 50.18-70.10%.
Further, the diverter 3 includes device body 31, a side wall of device body 31 is fixed to be linked together and is had inlet channel 32, top inlet tube 7 and below inlet tube 8 are fixed the intercommunication respectively at another lateral wall of device body 31, the inside of device body 31 is equipped with two reposition of redundant personnel district 33, the space size of two reposition of redundant personnel district 33 is unanimous, two reposition of redundant personnel district 33 communicate with top inlet tube 7 and below inlet tube 8 respectively, all be fixed with reposition of redundant personnel weir plate 34 in every reposition of redundant personnel district 33, a plurality of checkpoints 35 have been seted up on the reposition of redundant personnel weir plate 34, all be provided with a plurality of regulating plates 36 that are used for sheltering from weir point 35 on every reposition of redundant personnel weir plate 34, through inlet channel 32, top inlet tube 7, and the setting of below inlet tube 8 realize that a share water is two water. The water enters the device body 31 through the water inlet pipeline 32, is proportionally split by the split weir plate 34, enters each split area 33 and is discharged through the upper water inlet pipe 7 and the lower water inlet pipe 8 respectively. The weir crest 35 of the splitting weir plate 34 of the embodiment adopts a triangular weir crest 35, the number of the weir crest 35 of the splitting weir plate 34 corresponding to the upper water inlet pipe 7 and the lower water inlet pipe 8 is controlled by adjusting the lifting of the adjusting plate 36 on the splitting weir plate 34, when the same type and size of the weir crest 35 are used, and the same water depth passing through the weir is in direct proportion to the number of metering weir crest 35, and then the ratio of the number of the weir crest 35 of the splitting weir plate 34 corresponding to the upper water inlet pipe 7 and the lower water inlet pipe 8 is the ratio of the flow of the upper water inlet pipe 7 and the lower water inlet pipe 8. The split-flow weir plate 34 is used for splitting inflow water, the water distribution quantity of the upper water inlet pipe 7 and the lower water inlet pipe 8 is adjusted by adjusting the water outlet quantity of the weir crest 35, and the water distribution quantity proportion of the upper water inlet pipe 7 and the lower water inlet pipe 8 is adjustable by adjusting the water outlet quantity of the weir crest 35 through the adjusting plate 36, so that the split-flow weir plate is high in accuracy, easy and convenient to operate, does not increase movable equipment and saves energy, and is low in cost.
Further, the particle size of the filter material of the first main filter layer 4 is 5mm, the particle size of the filter material of the second main filter layer 5 is 13mm, and the particle size of the filter material of the water distribution layer 6 is 20mm. The thickness ratio of the filter materials of the first main filter layer 4, the second main filter layer 5 and the water distribution layer 6 is 2:2:1. In the implementation, the thickness of the filter material of the first main filter layer 4 is 400mm, the thickness of the filter material of the second main filter layer 5 is 400mm, and the thickness of the filter material of the water distribution layer 6 is 200mm. The particle size of the filter material gradually increases from top to bottom, and particularly, the water distribution layer 6 adopts the filter material with large particle size, so that the blockage is effectively prevented.
According to different water qualities, when dephosphorization is needed while denitrification is carried out, the first main filter layer 4, the second main filter layer 5 and the water distribution layer 6 are filled with porous dephosphorization light filter materials, namely, the filter materials of the first main filter layer 4, the second main filter layer 5 and the water distribution layer 6 are all composed of ceramic biological filter materials and porous dephosphorization light filter materials, specifically, the proportion of the porous dephosphorization light filter materials in the mixed filter materials is 12 percent of the total filter materials, so that the wetland dephosphorization is realized, and the dephosphorization rate is 57.54-63.35 percent.
Further, the specific surface areas of the ceramic biological filter material and the porous dephosphorizing light filter material are 1260-1750m 2/g, the porosities are 47-55%, the ceramic biological filter material and the porous dephosphorizing light filter material are particle filter materials, and the particle sizes of the ceramic biological filter material and the porous dephosphorizing light filter material in the embodiment are irregular surfaces. The filter material with high specific surface area has good treatment effect. The irregular surface is formed by crushing after the blank is formed, so that a particle filter material with the irregular surface is formed, and a large number of tiny pores sealed in the blank are exposed, so that the specific surface area is greatly increased.
The embodiment also provides a synchronous denitrification treatment process, which adopts the wetland for synchronous denitrification according to any one of the above steps to treat, thereby realizing the effects of total nitrogen removal without carbon sources and low cost.
Embodiment two:
As shown in fig. 2 and 4, the present embodiment differs from the first embodiment in that: the water inlet end of the return pipe 10 is fixedly communicated with the lower water outlet pipe 11, the water outlet end of the return pipe 10 is fixedly communicated with the upper water inlet pipe 7, and water discharged by the lower water outlet pipe 11 flows back into the unsaturated wetland 1 through the return pipe 10 for reprocessing, so that the nitrogen and phosphorus removal effect is better. The total nitrogen removal rate after the treatment of the wetland (1 time cycle) of the embodiment is 64.71-76.23%, the ammonia nitrogen removal rate is 59.35-75.45%, and the dephosphorization rate is 60.81-66.27%.
The embodiment also provides a treatment process for synchronous denitrification, which adopts the wetland for synchronous denitrification to treat, realizes the effects of no carbon source total nitrogen removal and low cost, and has better ammonia nitrogen removal rate and phosphorus removal rate.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A synchronous denitrification wetland is characterized in that:
The device comprises a diverter, an unsaturated wetland and a saturated wetland which are sequentially arranged along the water inlet direction;
The inside of the unsaturated wetland and the inside of the saturated wetland sequentially comprise a first main filter layer, a second main filter layer and a water distribution layer from top to bottom, wherein filter materials are filled in the first main filter layer, the second main filter layer and the water distribution layer, and the particle sizes of the filter materials of the first main filter layer, the second main filter layer and the water distribution layer are different;
The water inlet end of the upper water inlet pipe of the unsaturated wetland is communicated with one water outlet end of the flow divider, and the water inlet end of the lower water inlet pipe of the saturated wetland is communicated with the other water outlet end of the flow divider;
The water outlet end of the water inlet pipe below the saturated wetland and the water outlet end of the water outlet pipe below the unsaturated wetland are communicated with the water distribution layer of the saturated wetland;
The upper water outlet pipe of the saturated wetland is positioned above the first main filter layer in the saturated wetland;
The shunt includes a device body;
A water inlet pipeline is fixedly communicated with one side wall of the device body, and the upper water inlet pipe and the lower water inlet pipe are respectively fixedly communicated with the other side wall of the device body;
The device comprises a device body, wherein the inside of the device body is provided with two diversion areas, the space sizes of the two diversion areas are consistent, and the two diversion areas are respectively communicated with the upper water inlet pipe and the lower water inlet pipe;
a plurality of weir crest are arranged on each split flow area, and a plurality of adjusting plates for shielding the weir crest are arranged on each split flow weir crest;
the unsaturated wetland is a down-flow vertical flow wetland, and the saturated wetland is an up-flow vertical flow wetland;
the split ratio of the splitter is 0.9-1.2:1;
the particle size of the filter material of the first main filter layer is 4-6mm;
the particle size of the filter material of the second main filter layer is 11-15mm;
The particle size of the filter material of the water distribution layer is 18-32mm.
2. The synchronous denitrification wetland according to claim 1, wherein:
The thickness ratio of the filter materials of the first main filter layer, the second main filter layer and the water distribution layer is 1.8-2.2:1.8-2.2:1.
3. The synchronous denitrification wetland according to claim 2, wherein:
the thickness of the filter material of the first main filter layer is 400mm;
the thickness of the filter material of the second main filter layer is 400mm;
the thickness of the filter material of the water distribution layer is 200mm.
4. The synchronous denitrification wetland according to claim 1, wherein:
The filter material is a ceramic biological filter material or a mixed filter material consisting of a ceramic biological filter material and a porous dephosphorization light filter material;
the proportion of the porous dephosphorizing light filter material in the mixed filter material is 10-15% of the total filter material.
5. The synchronous denitrification wetland according to claim 4, wherein:
The specific surface areas of the ceramic biological filter material and the porous dephosphorizing light filter material are 1260-1750m 2/g, the porosities are 47-55%, and the ceramic biological filter material and the porous dephosphorizing light filter material have irregular surfaces.
6. The synchronous denitrification wetland according to claim 1, wherein:
the device also comprises a return pipe;
the water inlet end of the return pipe is fixedly communicated with the lower water outlet pipe, and the water outlet end of the return pipe is fixedly communicated with the upper water inlet pipe.
7. A sewage treatment process for synchronous denitrification is characterized in that:
Treatment with the synchronous denitrification wetland according to any one of claims 1 to 6.
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Application publication date: 20191112 Assignee: Huada Engineering Technology (Xiamen) Co.,Ltd. Assignor: ECOASIS ECOSYSTEM CO.,LTD. Contract record no.: X2024980017458 Denomination of invention: A wetland with synchronous denitrification and its treatment process Granted publication date: 20240611 License type: Common License Record date: 20241009 |