CN209010281U - Remove nitrogen equipment in gravity rectifier type ion-exchange sewage treatment end - Google Patents
Remove nitrogen equipment in gravity rectifier type ion-exchange sewage treatment end Download PDFInfo
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- CN209010281U CN209010281U CN201821328249.5U CN201821328249U CN209010281U CN 209010281 U CN209010281 U CN 209010281U CN 201821328249 U CN201821328249 U CN 201821328249U CN 209010281 U CN209010281 U CN 209010281U
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- 239000010865 sewage Substances 0.000 title claims abstract description 66
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 32
- 238000005342 ion exchange Methods 0.000 title claims abstract description 22
- 230000005484 gravity Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 290
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 51
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims description 91
- 238000011069 regeneration method Methods 0.000 claims description 38
- 230000008929 regeneration Effects 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 31
- 238000004140 cleaning Methods 0.000 claims description 9
- 150000002500 ions Chemical class 0.000 claims description 8
- 239000003957 anion exchange resin Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- NRTLIYOWLVMQBO-UHFFFAOYSA-N 5-chloro-1,3-dimethyl-N-(1,1,3-trimethyl-1,3-dihydro-2-benzofuran-4-yl)pyrazole-4-carboxamide Chemical compound C=12C(C)OC(C)(C)C2=CC=CC=1NC(=O)C=1C(C)=NN(C)C=1Cl NRTLIYOWLVMQBO-UHFFFAOYSA-N 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 206010038743 Restlessness Diseases 0.000 abstract 1
- 230000008439 repair process Effects 0.000 abstract 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 108091006146 Channels Proteins 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000001174 ascending effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910002651 NO3 Inorganic materials 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000012492 regenerant Substances 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 1
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- Treatment Of Water By Ion Exchange (AREA)
Abstract
Nitrogen equipment, including pond body are removed in a kind of gravity rectifier type ion-exchange sewage treatment end, are made of the inhalant region of water flowing from bottom to up, reaction zone and exhalant region, and pass through lower filter screen partition and upper filter screen partition subregion；Inhalant region has water inlet, for accessing sewage；Water flow fairing and ion exchange resin layer are equipped in reaction zone, the former is set to above lower filter screen partition, is rectified into laminar flow regime water flow for that will intake, the latter is made of several ion-exchange resin particles, is denitrogenated for carrying out ion exchange；Sewage is discharged after being denitrogenated processing at the top of exhalant region.The utility model is that scheme is denitrogenated in the efficient low-consume end of sewage treatment, can significantly reduce total nitrogen content in water outlet；Using gravity type ion-exchange, so that efficient ion-exchange is applicable to different scales and denitrogenate demand；The utilization rate that ion exchange resin layer is improved using water flow fairing avoids the effect for influencing ion-exchange reactions in operation or regenerative process because of ion exchange resin unrest layer.
Description
Technical Field
The utility model relates to a town sewage treatment field, concretely relates to terminal denitrogenation equipment of gravity rectifier formula ion exchange method sewage treatment.
Background
In the urban domestic sewage treatment project, under the current situation that the national economy is rapidly developed and the living standard of people is continuously improved, the national leaders repeatedly emphasize and optimize the ecological environment and strengthen multiple instructions of pollution prevention and control, and the countries and the places also establish a strict supervision mechanism for water pollution prevention and control and are normalized.
According to the current national standard (GB 18918-2012), the water quality index of the discharged water after the urban domestic sewage treatment has the highest allowable discharge concentration (daily average) in the basic control project: COD 50mg/L, BOD 510 mg/L, SS 10mg/L, TN 15mg/L, NH 3-N5 (8) mg/L, TP 0.5.5 mg/L, PH value 6-9, etc.
The existing treatment process mainly comprises biochemical treatment, and the method comprises the following steps: the oxidation ditch method, the SBR method, the CASS method, the activated sludge method and the like have certain difficulty in completely reaching the standard due to the problems of limitation or frequent operation of the technical process, wherein TP and TN indexes have over-standard risks, and the over-standard risk of TP can be reduced only to a certain extent even after the physicochemical method is added for dephosphorization.
The foreign A-A-O method synchronous nitrogen and phosphorus removal process is introduced domestically for 20-30 years, the process is improved compared with the treatment process after part of projects are implemented, but T P standard meeting needs to be removed by a physical and chemical method, and the main component in TN index is NO3 -If the anaerobic biochemical denitrification effect is not ideal, the anaerobic biochemical denitrification effect cannot be removed by a common physical and chemical method, so that factors of TN (total nutrient) increase still exist, particularly when a small amount of industrial sewage suddenly enters to cause impact load or sudden explosion in winter influences the normal functions of microorganisms in a biochemical treatment tank. In addition, as the country pays more and more attention to the ecological environment, the possibility of re-upgrading the emission standard also exists.
The ion exchange method has wide application in the field of water treatment, such as softening treatment of water for boilers, desalting treatment of industrial water, preparation of pure water, heavy metal removal of industrial wastewater and the like. However, the fixed bed co-current running counter-current regeneration ion exchange method has the following problems if used for denitrification at the end of town sewage treatment:
1. the pressure container is limited to be used for micro-scale sewage treatment and is difficult to be applied in the large and medium-scale sewage treatment process;
2. the fixed bed countercurrent regeneration method has the following factors that the exchange resin layer causes disorder:
2-1. specific gravity of regenerant (NaCl) solution and Cl-The type of the strong-base anion exchange resin is equivalent, and the regenerant is pumped into equipment by a pump pressure to lift water flow to have upward thrust effect on the exchange resin;
2-2, the Reynolds number Re of ascending water flow of the regenerated liquid greatly exceeds the critical Reynolds number Rek 2000-2300, and the regenerated liquid is in a turbulent flow state;
3. the regeneration process comprises the following steps: small backwashing, water drainage, top pressing, regeneration, backwashing and forward washing are carried out in six steps, and the operation is relatively troublesome;
4. the effective utilization rate of the space for storing the ion exchange resin in the equipment is only about 70 percent.
Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The utility model aims at providing a terminal nitrogen removal equipment of gravity rectifier formula ion exchange method sewage treatment.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a gravity rectification type ion exchange method sewage treatment tail end nitrogen removal device comprises at least one sewage treatment unit, wherein the sewage treatment unit comprises a tank body, and the tank body is composed of a water inlet area, a reaction area and a water outlet area which are communicated with each other by water flow from bottom to top; wherein,
a lower filter screen partition plate is arranged between the water inlet area and the reaction area, an upper filter screen partition plate is arranged between the reaction area and the water outlet area, and a plurality of water through holes are formed in the upper filter screen partition plate and the lower filter screen partition plate;
the water inlet area is provided with a water inlet which is used for accessing sewage to be treated;
a water flow rectifying device and an ion exchange resin layer are arranged in the reaction zone; the water flow rectifying device is arranged above the lower filter screen partition plate and is used for rectifying the inlet water into laminar flow water flow; the ion exchange resin layer is composed of a plurality of ion exchange resin particles, and the particle size of each ion exchange resin particle is larger than the aperture of the limber hole;
and the sewage is subjected to nitrogen removal treatment and then flows out from the top of the water outlet area.
The relevant content in the above technical solution is explained as follows:
1. in the scheme, the water flow rectifying device can ensure that the Reynolds number Re is greatly smaller than the critical Reynolds number Rek by controlling the water inflow at the lower part, and the ion exchange resin layer rising along with the water flow is not disordered.
2. In the above scheme, the upper filter screen partition board and the lower filter screen partition board both comprise two grid plates, the two grid plates are arranged one above the other, and a layer of high-strength fiber mesh (such as nylon mesh) or stainless steel mesh with the aperture smaller than that of the ion exchange resin particles is clamped between the two grid plates.
The grid plate can be made of plastic or glass fiber reinforced plastic, and the diameter of the grid on the grid plate can be larger than the particle size of the ion exchange resin particles. When prefabricating, a plurality of rectangles can be horizontally spliced and assembled or directly installed by a whole block with the same area as the cross section of the pool body.
3. In the scheme, the height of the water flow rectifying device accounts for 20-95% of the height of the reaction zone. The water flow rectifying device is provided with a plurality of closely arranged rectifying holes, and the cross section of each rectifying hole is in a honeycomb shape or a rectangular shape.
The water flow rectifying device can be made of plastic, the height and the aperture of the rectifying hole can be flexibly adjusted according to the design requirement, and the water flow rectifying device is fixed on the lower filter screen partition plate.
4. In the scheme, the wall thickness of each rectifying hole is 0.3-1.5 mm, preferably 0.5-1 mm, so as to meet the strength requirement of the water flow rectifying device; the inner tangent diameter of each rectifying hole is 30-100 mm, preferably 40-60 mm, the smaller the inner tangent diameter is, the smaller the Reynolds number Re is, and the better the rectifying effect is.
5. In the above scheme, the ion exchange resin particles are Cl-Form strongly basic anion exchange resin particles; the wet apparent density of the ion exchange resin particles is 0.65-0.75 g/mL, preferably 0.67-0.73 g/mL, and the particle size is 0.3-1 mm, preferably 0.4-0.7 mm.
6. In the scheme, the volume of the ion exchange resin layer accounts for 90-95% of the volume of the reaction zone. The filter screen baffle plate is mainly arranged in each rectifying hole of the water flow rectifying device and in a space from the upper part of the water flow rectifying device to the lower part of the upper filter screen baffle plate; since the ion exchange resin layer is expanded in the washing step of the regeneration treatment, it cannot be disposed so as to occupy the entire space of the reaction zone.
7. In the above scheme, the sewage treatment device further comprises a sewage inlet valve and a first flowmeter, wherein the sewage inlet valve and the first flowmeter are both arranged on a water inlet pipe, and the water inlet pipe is communicated with the water inlet.
8. In the scheme, the cross section of the pool body is rectangular; and when the number of the water treatment units is multiple, the water treatment units are arranged in parallel along the horizontal direction. The rectangular design is beneficial to construction and forming through reinforced concrete, horizontal splicing and combination are facilitated, daily sewage treatment capacity can reach ten-thousand tons, and the method is suitable for regions with large domestic sewage treatment capacity such as towns.
The cross-sections referred to herein all refer to cross-sections in the horizontal direction.
9. In the scheme, at least one inverted trapezoidal channel is arranged at the bottom of the water inlet area along the horizontal direction; the water inlet pipe comprises a first water inlet pipe and at least one second water inlet pipe, and each second water inlet pipe is communicated with the first water inlet pipe; the first water inlet pipe is communicated with the water inlet and is used for introducing sewage to be treated into the water inlet area; each second water inlet pipe is horizontally arranged at the bottom of each inverted trapezoidal channel and corresponds to the bottom of each inverted trapezoidal channel one by one;
the pipe body of each second water inlet pipe is provided with a plurality of water permeable holes at intervals along the length direction of the pipe body, the water permeable holes are arranged in a 45-degree inclined downward mode, water flow of water outlet of each water permeable hole impacts the side wall of the inverted trapezoidal channel, water flow reflection is generated, and uniform water flow is generated.
10. In the above scheme, the arrangement position of the first water inlet pipe is higher than the arrangement position of each second water inlet pipe; the second water inlet pipes are arranged in parallel at intervals, and the joints of the first water inlet pipes and the second water inlet pipes are positioned at the central position of the water inlet area in the horizontal direction.
Borrow this design, through first inlet tube with sewage evenly leading-in to each second inlet tube, sewage flows towards the both ends of each second inlet tube to the even each of flowing through the hole of permeating water can make the rivers even flow in the district of intaking, and the rivers fairing in the cooperation reaction zone helps further reducing rivers reynolds number Re.
11. In the above scheme, the device further comprises a water outlet pipeline system, wherein the water outlet pipeline system comprises a plurality of water outlet perforated pipes, a plurality of water outlet branch pipes, a water outlet valve and a water outlet main pipe; the water outlet perforated pipes are communicated with the water outlet branch pipes in a one-to-one correspondence manner, the water outlet branch pipes are communicated with the water outlet main pipe, and the water outlet valves are connected to the water outlet branch pipes. And sewage enters the water outlet perforated pipes from the water outlet area after being subjected to nitrogen removal treatment, and converges to the water outlet main pipe through the water outlet branch pipes to flow out.
12. In the above scheme, each water outlet perforated pipe is arranged in parallel and at intervals along the horizontal direction, so that water outlet is more uniform, beneficial influence is also generated on ascending water flow of the reaction zone, and ascending water flow disorder is avoided.
13. In the above scheme, each water outlet perforated pipe is provided with a plurality of water inlet holes at intervals along the length direction, and the orifice of each water inlet hole is arranged in an inclined upward direction at an angle of 45 degrees so as to further enable the water outlet to be more uniform.
14. In the above scheme, the ion exchanger further comprises a pipeline system for ion regeneration, ion replacement and cleaning, wherein the pipeline system comprises a plurality of liquid inlet perforated pipes, a plurality of liquid inlet branch pipes, a liquid inlet valve and a liquid inlet main pipe; each liquid inlet perforated pipe is communicated with each liquid inlet branch pipe in a one-to-one correspondence manner, each liquid inlet branch pipe is communicated with the liquid inlet main pipe, and the liquid inlet valve is connected to the liquid inlet branch pipe; the water inlet area is communicated with the water inlet of the water inlet area through a water inlet valve, and the water inlet area is communicated with the water inlet area through a water inlet pipe.
15. In the above scheme, each liquid inlet perforated pipe is arranged in parallel and at intervals along the horizontal direction, so that the regenerated liquid or the cleaning water can flow into the water outlet area more uniformly.
16. In the above scheme, each liquid inlet perforated pipe is provided with a plurality of liquid outlet holes at intervals along the length direction, and the orifice of each liquid outlet hole is obliquely arranged downwards at an angle of 45 degrees.
The utility model discloses a theory of operation and advantage as follows:
1. a high-efficiency low-consumption tail-end nitrogen removal method is provided, which is beneficial to reducing the risk of overproof total nitrogen in urban domestic sewage treatment;
2. the gravity type ion exchange method is adopted, so that the high-efficiency ion exchange method can be applied to the requirements of nitrogen removal in sewage treatment of different scales;
3. the water flow rectifying device is adopted to improve the utilization rate of the ion exchange resin layer, so that the problem that the disordered layer of the ion exchange resin layer influences the ion exchange reaction effect in the running or regeneration process is solved;
4. compared with a fixed bed countercurrent regeneration method, the method has the advantages that the treatment effect is more stable and the consumption of a regenerant is less by adopting an upflow operation and countercurrent regeneration method;
5. the system adopts multiple devices, is started in a segmented manner according to the equal time, can manually control the total nitrogen of the treated total effluent, is flexible, enables the effluent to stably reach the standard, and has good response capability if the national discharge standard is upgraded;
6. the large and medium scale sewage treatment can adopt reinforced concrete structures, adopts multi-pool combination and parallel operation, and alternately regenerates;
7. the operation and management are simple and convenient, and the automatic operation is easy to realize.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention (a schematic structural diagram of a cross section along the direction B-B in fig. 3);
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a schematic view of the cross-sectional structure of FIG. 3 taken along the line C-C;
fig. 5 is a schematic structural diagram of a pipeline system according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a water outlet perforated pipe according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a liquid inlet perforated pipe according to an embodiment of the present invention;
FIG. 8 is a schematic sectional view of a second inlet pipe according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a grid plate according to an embodiment of the present invention.
In the above drawings: 1. a water inlet area; 2. a reaction zone; 3. a water outlet area; 4. a lower screen separator; 5. a filter screen clapboard is arranged; 6. a water inlet; 7. an inverted trapezoidal channel; 8. a first water inlet pipe; 9. a second water inlet pipe; 10. water permeable holes; 11. a water flow rectifying device; 12. a sewage inlet valve; 13. a first flow meter; 14. an ion exchange resin layer; 15. a flow rectifying hole; 16. a water outlet perforated pipe; 17. a water outlet branch pipe; 18. a water outlet valve; 19. a water outlet main pipe; 20. a water inlet hole; 21. a liquid inlet perforated pipe; 22. a liquid inlet branch pipe; 23. a liquid inlet valve; 24. a liquid inlet header pipe; 25. a liquid discharge pipe; 26. a drain valve; 27. a second flow meter; 28. a liquid outlet hole; 29. a grid plate; 30. and (4) grid.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
example (b): referring to the attached drawings 1-9, a gravity rectification type ion exchange method sewage treatment tail end nitrogen removal device comprises at least one sewage treatment unit, wherein the sewage treatment unit comprises a tank body, and the tank body is composed of a water inlet area 1, a reaction area 2 and a water outlet area 3 which are communicated with each other by water flow from bottom to top; the cross section of the pool body is rectangular, and when the number of the water treatment units is multiple, the water treatment units are arranged in parallel along the horizontal direction. The rectangular design is beneficial to construction and forming through reinforced concrete, horizontal splicing and combination are facilitated, daily sewage treatment capacity can reach ten-thousand tons, and the method is suitable for regions with large domestic sewage treatment capacity such as towns.
Wherein, intake district 1 reaches be equipped with filter screen baffle 4 once between the reaction zone 2, reaction zone 2 reaches it goes out to be equipped with a filter screen baffle 5 between the water zone 3, go up filter screen baffle 5 and all be equipped with the several limbers on the filter screen baffle 4 down.
The water inlet area 1 is provided with a water inlet 6, and the water inlet 6 is used for accessing sewage to be treated; the bottom of the water inlet area 1 is provided with at least one inverted trapezoidal channel 7 along the horizontal direction; the water inlet device also comprises a first water inlet pipe 8 and at least one second water inlet pipe 9, wherein each second water inlet pipe 9 is communicated with the first water inlet pipe 8; the first water inlet pipe 8 is communicated with the water inlet 6 and is used for introducing sewage to be treated into the water inlet area 1; each second water inlet pipe 9 is horizontally arranged at the bottom of each inverted trapezoidal channel 7 and corresponds to the bottom of each inverted trapezoidal channel one by one; each the body of second inlet tube 9 is gone up along its length direction spaced apart and is equipped with the several hole 10 of permeating water, and each the hole 10 of permeating water is 45 degrees slant settings (see figure 8), constitutes each the play rivers impact of the hole 10 of permeating water the lateral wall of inverted trapezoid channel 7 can produce the rivers reflection, is favorable to producing the equipartition rivers.
The arrangement position of the first water inlet pipe 8 is higher than that of each second water inlet pipe 9; the second water inlet pipes 9 are arranged in parallel at intervals, and the joints of the first water inlet pipes 8 and the second water inlet pipes 9 are positioned at the central position of the water inlet area 1 in the horizontal direction. Borrow this design, through first inlet tube 8 with sewage evenly leading-in to each second inlet tube 9, sewage flows towards the both ends of each second inlet tube 9 to the even outflow is respectively the hole 10 of permeating water can make the rivers uniform flow of intake zone 1, and the rivers fairing 11 in the cooperation reaction zone helps further reducing rivers reynolds number Re.
The sewage treatment device also comprises a sewage inlet valve 12 and a first flowmeter 13 which are both arranged on the first water inlet pipe 8.
A water flow rectifying device 11 and an ion exchange resin layer 14 are arranged in the reaction zone 2; the water flow rectifying device 11 is arranged above the lower filter screen partition plate 4 and is used for rectifying inflow water into laminar flow water flow, and the Reynolds number Re can be greatly smaller than the critical Reynolds number Rek by controlling the inflow water at the lower part, so that the ion exchange resin rising along with the water flow is prevented from being disordered. The ion exchange resin layer 14 is composed of a plurality of ion exchange resin particles, and the particle diameter of each ion exchange resin particle is larger than the pore diameter of the water through hole.
The height of the water flow rectifying device 11 accounts for 20-95% of the height of the reaction zone 2. The water flow rectifying device 11 is provided with a plurality of closely arranged rectifying holes 15, and the cross section of each rectifying hole 15 is in a honeycomb shape or a rectangular shape. The wall thickness of each rectifying hole 15 is 0.3-1.5 mm, preferably 0.5-1 mm, so as to meet the strength requirement of the water flow rectifying device; the internally tangent diameter of each rectifying hole 15 is 30-100 mm, preferably 40-60 mm, and the smaller the internally tangent diameter is, the smaller the Reynolds number Re of the water flow is, and the better the rectifying effect is.
The water flow rectifying device 11 can be made of plastic, the height and the aperture of the rectifying hole 15 can be flexibly adjusted according to the design requirement, and the water flow rectifying device is fixed on the lower filter screen partition plate 4.
Wherein the ion exchange resin particles are Cl-Form strongly basic anion exchange resin particles; the wet apparent density of the ion exchange resin particles is 0.65-0.75 g/mL, preferably 0.67-0.73 g/mL, and the particle size is 0.3-1 mm, preferably 0.4-0.7 mm.
The volume of the ion exchange resin layer 14 accounts for 90-95% of the volume of the reaction zone 2. Mainly arranged in each rectifying hole 15 of the water flow rectifying device 11 and in the space from the upper part of the water flow rectifying device 11 to the lower part of the upper filter screen clapboard 5; since the ion exchange resin layer is expanded in the washing step of the regeneration treatment, it cannot be disposed so as to occupy the entire space of the reaction zone 2.
The water outlet device also comprises a water outlet pipeline system, wherein the water outlet pipeline system comprises a plurality of water outlet perforated pipes 16, a plurality of water outlet branch pipes 17, a water outlet valve 18 and a water outlet main pipe 19; the water outlet perforated pipes 16 are correspondingly communicated with the water outlet branch pipes 17 one by one, the water outlet branch pipes 17 are communicated with the water outlet main pipe 19, and the water outlet valves 18 are connected to the water outlet branch pipes 17. The sewage after the nitrogen removal treatment enters each water outlet perforated pipe 16 from the water outlet area 3 and flows out from the water outlet main pipe 19 through each water outlet branch pipe 17.
The water outlet perforated pipes 16 are arranged in parallel and at intervals along the horizontal direction, so that water outlet is more uniform, beneficial influence is also generated on ascending water flow of the reaction zone 2, and turbulence of the ascending water flow is avoided. A plurality of water inlet holes 20 are arranged on each water outlet perforated pipe 16 at intervals along the length direction of the water outlet perforated pipe, and the opening of each water inlet hole 20 is arranged in an inclined upward direction of 45 degrees (see fig. 6) so as to further enable the water outlet to be more uniform.
The device also comprises a pipeline system for ion regeneration, ion replacement and cleaning, wherein the pipeline system comprises a plurality of liquid inlet perforated pipes 21, a plurality of liquid inlet branch pipes 22, a liquid inlet valve 23 and a liquid inlet main pipe 24; each liquid inlet perforated pipe 21 is communicated with each liquid inlet branch pipe 22 in a one-to-one correspondence manner, each liquid inlet branch pipe 22 is communicated with the liquid inlet header pipe 24, and the liquid inlet valve 23 is connected to the liquid inlet branch pipe 22; the device also comprises a liquid discharge pipe 25, the liquid discharge pipe 25 is communicated with the water inlet 6 of the water inlet area 1 through a liquid discharge valve 26, and a second flow meter 27 is further connected to the liquid discharge pipe 25.
The inlet pipes 21 are arranged in parallel and at intervals in the horizontal direction, so that the regeneration liquid or the washing water can flow into the outlet zone 3 more uniformly. A plurality of liquid outlet holes 28 (see fig. 7) are arranged on each liquid inlet perforated pipe 21 at intervals along the length direction thereof, and the orifice of each liquid outlet hole 28 is arranged in a 45-degree oblique downward manner.
The upper filter screen partition plate 5 and the lower filter screen partition plate 4 both comprise two grid plates 29, the two grid plates 29 are arranged one above the other, and a layer of high-strength fiber mesh (such as nylon mesh and the like) or stainless steel mesh with the pore diameter smaller than that of the ion exchange resin particles is clamped between the two grid plates 29.
As shown in fig. 9, the grid plate 29 may be made of plastic (or glass fiber reinforced plastic), and the diameter of the grid 30 on the grid plate 29 may be larger than the particle size of the ion exchange resin particles. When prefabricating, a plurality of rectangles can be horizontally spliced and assembled or directly installed by a whole block with the same area as the cross section of the pool body.
The nitrogen removal method of the utility model comprises the following steps:
step one, pretreatment
Firstly, nitrogen compounds in the sewage are oxidized and nitrified into Nitrate (NO) through aerobic biochemical treatment3 -Class);
secondly, adding a flocculating agent into the water, and performing coagulating sedimentation and filtration treatment to obtain clear effluent;
step two, nitrogen removal treatment
Firstly, the ion exchange resin layer 14 in the reaction zone 2 of the apparatus is selected from Cl-Type strongly basic anion exchange resin particles;
secondly, the pretreated NO-containing material is mixed with3 -The sewage is sent into the equipment from the water inlet area 1 of the equipment, runs from bottom to top and flows into the reaction area 2 to carry out the ion exchange reaction for removing nitrogen, and the chemical formula of the reaction is as follows:
RCl-+NaNO3→RNO3-+NaCl
wherein R isCl-Represents Cl-Type strongly basic anion exchange resin, RNO3-Represents Cl after the reaction-Quilt NO3 -An exchanged ion exchange resin;
then, the water after nitrogen removal flows out through a water outlet pipeline through a water outlet area 3 of the equipment, and when the total nitrogen value (TN) in the outlet water is detected to reach a preset value, the sewage stops flowing into the equipment, so that a nitrogen removal treatment period of the sewage is completed;
step three, regeneration treatment
Firstly, NaCl is selected as a regenerant, and water is used for preparing a regenerated liquid with the concentration of 6-10%;
secondly, the regeneration liquid flows into the reaction zone 2 from top to bottom through a liquid inlet pipeline, and the ion exchange resin layer 14 is subjected to an ion exchange reaction, wherein the chemical formula of the reaction is as follows:
RNO3-+NaCl→RCl-+NaNO3；
and after the regeneration treatment is finished, repeating the step two and entering the next denitrogenation treatment period.
The aerobic biochemical treatment is the prior art, and refers to a biochemical process for degrading and converting organic matters into humus-like substances under the conditions of proper carbon-nitrogen ratio, water content, oxygen and the like in the presence of microorganisms.
Wherein, in the step one, besides the flocculating agent, a phosphorus removing agent is also needed to be added, so that the Total Phosphorus (TP) value in the effluent reaches less than 0.5mg/L, the smaller the TP, the better, or otherwise, the Total Phosphorus (TP) value is originally equal to NO3 -Cl undergoing ion exchange-Will be reacted with PO4 3-Ion exchange occurs, and the nitrogen removal effect and nitrogen removal efficiency during operation are influenced;
and a coagulant aid can be added to further flocculate the small-particle suspended matters flocculated by the flocculating agent in the sewage into large-particle suspended matters, so that the definition of water quality is improved.
In the second step, the preset value of the total nitrogen in the effluent is less than or equal to 15 mg/L. The preset value is national standard, and the total nitrogen content in the effluent can be further reduced by increasing a sewage treatment unit or shortening a regeneration treatment period so as to deal with the future national standard improvement.
In step two, after completing a nitrogen removal treatment cycle of the sewage, the ion exchange resin layer 14 includes a lower saturation region, a middle working region and an upper protection region; r in the saturation regionCl-Have all been exchanged for RNO3-R in the working regionCl-R in the protection zone during switchingCl-Only part of which is exchanged for RNO3-。
Borrow this design, the accessible protection zone protects the ion exchange resin layer, avoids it to be broken down by sewage "and lose the denitrogenation effect, promptly, if the protection zone also becomes the workspace even protection zone, then the total nitrogen of aquatic hardly guarantees not exceeding standard, and the ion exchange effect of ion exchange resin layer has become invalid this moment.
In the third step, the concentration of the regeneration liquid is preferably 8-10%. If the amount of Cl-is less than 8%, too little Cl-will affect the efficiency of the regeneration treatment, and if it is more than 10%, the ion exchange resin particles will shrink excessively, thereby affecting the effect of the regeneration treatment.
In the second step, the liquid outlet valve 26 and the liquid inlet valve 23 of the equipment are closed, and then the sewage inlet valve 12 and the sewage outlet valve 18 of the equipment are opened, wherein NO is contained3-After being measured by a first flowmeter 13, the sewage enters a water inlet area 1 of the equipment from a first water inlet pipe 8 through a water inlet 6, and water flows uniformly through a second water inlet pipe 9 for water inlet and then continues to flow upwards;
the water flow flows upwards through the lower filter screen partition plate 4 to flow into the reaction zone 2, and is rectified by the water flow rectifying device 11 at the lower part of the ion exchange resin layer 14, so that the Reynolds number Re of the water flow is greatly smaller than the critical Rek, the rectified water flow becomes a laminar flow water flow, and meanwhile, the ion exchange resin layer 14 is also pushed by the water flow to the top part of the ion exchange resin layer to be positioned below the upper filter screen partition plate 5; after ion exchange reaction, water enters a water outlet zone 3 of the equipment;
when the water flow rises to the upper part of the water outlet area 3, water is discharged through the water outlet pipeline, enters the water outlet perforated pipe 16 through the water inlet holes 20, is converged by the water outlet branch pipes 17 and then enters the water outlet main pipe 19 for water outlet; when the total nitrogen value (TN) in the effluent reaches a preset index, completing a nitrogen removal treatment period; closing the sewage inlet valve 12 and the outlet valve 18 to stop water inlet, opening the drainage valve 26 to lower the water level to the upper filter screen partition 5, closing the drainage valve 26, and simultaneously, the ion exchange resin layer 14 falls back to the state before operation along with the downward water flow.
In the third step, the regeneration treatment comprises three steps of regeneration, replacement and cleaning;
during regeneration, a liquid inlet valve 23 is firstly opened to uniformly feed prepared NaCl regeneration liquid into the water outlet zone 3 through a liquid inlet pipeline, the regeneration liquid is divided into liquid inlet branch pipes 22 through a liquid inlet header pipe 24 and then flows into the liquid inlet perforated pipe 21, the regeneration liquid uniformly flows into the water outlet zone 3 through a plurality of liquid outlet holes 28 on the liquid inlet perforated pipe 21, and the water outlet zone 3 serves as a regeneration liquid storage zone; after the regeneration liquid required by the primary regeneration treatment is fed, taking the concentration of the regeneration liquid as an example of 10%, wherein the volume of the regeneration liquid is half of the volume of the ion exchange resin layer (the volume of the regeneration liquid is inversely proportional to the concentration of the regeneration liquid), the highest liquid level is at the bottom of the liquid inlet perforated pipe 21, a liquid discharge valve 26 is opened, the amount is controlled by a second flow meter 27, the regeneration liquid uniformly flows downwards into the ion exchange resin layer 14 of the reaction zone 2 at equal pressure and low flow rate (namely, the flow rate and the flow rate of the water flow are lower than those in the nitrogen removal treatment), the liquid level is reduced to the position of the upper filter screen partition plate 5, and the liquid discharge valve 26 is closed;
during replacement, a liquid inlet valve 23 is opened, and clean water (optionally tap water) is uniformly sent to the reserve zone through a liquid inlet pipeline, namely, the clean water is shunted to a liquid inlet branch pipe 22 through a liquid inlet main pipe 24, then flows into a liquid inlet perforated pipe 21, and uniformly flows into a water outlet zone 3 through a plurality of liquid outlet holes 28 on the liquid inlet perforated pipe 21 until the water level reaches a set upper limit; then opening a drain valve 26, controlling the flow by a second flow meter 27 according to the same slow low flow rate as the regenerated liquid, and carrying out downward displacement in a countercurrent manner until the water level is reduced to the upper filter screen partition plate 5; replacement is understood to be the second part of the regeneration, and typically the volume of replacement fluid is the same as the regeneration fluid.
And during cleaning, opening the large drainage valve 26, rapidly cleaning the ion exchange resin layer 14 downwards at a large flow rate, closing the drainage valve 26 and the liquid inlet valve 23 until the set cleaning flow rate or/and cleaning time, ending the regeneration treatment step at this moment, and repeating the second step.
Wherein the waste liquid generated during the regeneration treatment is discharged through the water inlet 6 and the liquid discharge pipe 25.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a terminal nitrogen removal equipment of gravity rectifier formula ion exchange method sewage treatment which characterized in that:
the device comprises at least one sewage treatment unit, wherein the sewage treatment unit comprises a tank body, and the tank body consists of a water inlet area, a reaction area and a water outlet area which are communicated with each other from bottom to top; wherein,
a lower filter screen partition plate is arranged between the water inlet area and the reaction area, an upper filter screen partition plate is arranged between the reaction area and the water outlet area, and a plurality of water through holes are formed in the upper filter screen partition plate and the lower filter screen partition plate;
the water inlet area is provided with a water inlet which is used for accessing sewage to be treated;
a water flow rectifying device and an ion exchange resin layer are arranged in the reaction zone; the water flow rectifying device is arranged above the lower filter screen partition plate and is used for rectifying the inlet water into laminar flow water flow; the ion exchange resin layer is composed of a plurality of ion exchange resin particles, and the particle size of each ion exchange resin particle is larger than the aperture of the limber hole;
and the sewage is subjected to nitrogen removal treatment and then flows out from the top of the water outlet area.
2. The apparatus of claim 1, wherein: go up the filter screen baffle and filter screen baffle down all includes two graticule boards, two the graticule board sets up from top to bottom, and the centre of two graticule boards presss from both sides and establishes the fibre web that a layer of aperture is less than the ion exchange resin granule.
3. The apparatus of claim 1, wherein: the height of the water flow rectifying device accounts for 20-95% of the height of the reaction zone, a plurality of closely arranged rectifying holes are arranged in the water flow rectifying device, and the cross section of each rectifying hole is in a honeycomb shape or a rectangular shape; the volume of the ion exchange resin layer accounts for 90-95% of the volume of the reaction zone.
4. The apparatus of claim 1, wherein: the ion exchange resin particles are Cl-Strong base anion exchange resin particles.
5. The apparatus of claim 1, wherein: the sewage treatment device also comprises a sewage inlet valve and a first flowmeter, wherein the sewage inlet valve and the first flowmeter are both arranged on a water inlet pipe, and the water inlet pipe is communicated with the water inlet.
6. The apparatus of claim 1, wherein: the cross section of the pool body is rectangular; and when the number of the water treatment units is multiple, the water treatment units are arranged in parallel along the horizontal direction.
7. The apparatus of claim 1, wherein: the bottom of the water inlet area is provided with at least one inverted trapezoidal channel along the horizontal direction; the water inlet pipe comprises a first water inlet pipe and at least one second water inlet pipe, and each second water inlet pipe is communicated with the first water inlet pipe; the first water inlet pipe is communicated with the water inlet and is used for introducing sewage to be treated into the water inlet area; each second water inlet pipe is horizontally arranged at the bottom of each inverted trapezoidal channel and corresponds to the bottom of each inverted trapezoidal channel one by one;
and a plurality of water permeable holes are formed in the pipe body of each second water inlet pipe at intervals along the length direction of the pipe body, the water permeable holes are obliquely arranged downwards, and the water outlet flow of each water permeable hole impacts the side wall of the inverted trapezoidal channel.
8. The apparatus of claim 7, wherein: the arrangement position of the first water inlet pipe is higher than that of each second water inlet pipe; the second water inlet pipes are arranged in parallel at intervals, and the joints of the first water inlet pipes and the second water inlet pipes are positioned at the central position of the water inlet area in the horizontal direction.
9. The apparatus of claim 1, wherein: the water outlet pipeline system comprises a plurality of water outlet perforated pipes, a plurality of water outlet branch pipes, a water outlet valve and a water outlet main pipe; the water outlet perforated pipes are communicated with the water outlet branch pipes in a one-to-one correspondence manner, the water outlet branch pipes are communicated with the water outlet main pipe, and the water outlet valves are connected to the water outlet branch pipes.
10. The apparatus of claim 1, wherein: the device also comprises a pipeline system for ion regeneration, ion replacement and cleaning, wherein the pipeline system comprises a plurality of liquid inlet perforated pipes, a plurality of liquid inlet branch pipes, a liquid inlet valve and a liquid inlet main pipe; each liquid inlet perforated pipe is communicated with each liquid inlet branch pipe in a one-to-one correspondence manner, each liquid inlet branch pipe is communicated with the liquid inlet main pipe, and the liquid inlet valve is connected to the liquid inlet branch pipe; the water inlet area is communicated with the water inlet of the water inlet area through a water inlet valve, and the water inlet area is communicated with the water inlet area through a water inlet pipe.
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| CN201821328249.5U CN209010281U (en) | 2018-08-17 | 2018-08-17 | Remove nitrogen equipment in gravity rectifier type ion-exchange sewage treatment end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108706788A (en) * | 2018-08-17 | 2018-10-26 | 谢绍舜 | Denitrogenate device and method in gravity rectifier type ion-exchange sewage disposal end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108706788A (en) * | 2018-08-17 | 2018-10-26 | 谢绍舜 | Denitrogenate device and method in gravity rectifier type ion-exchange sewage disposal end |
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