CN112939336A - Upflow denitrification device and method based on sulfur autotrophy - Google Patents
Upflow denitrification device and method based on sulfur autotrophy Download PDFInfo
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- CN112939336A CN112939336A CN202110101014.2A CN202110101014A CN112939336A CN 112939336 A CN112939336 A CN 112939336A CN 202110101014 A CN202110101014 A CN 202110101014A CN 112939336 A CN112939336 A CN 112939336A
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 27
- 239000011593 sulfur Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000010802 sludge Substances 0.000 claims abstract description 64
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000005273 aeration Methods 0.000 claims description 10
- 230000001651 autotrophic effect Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000006701 autoxidation reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000000378 dietary effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
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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
- C02F7/00—Aeration of stretches of water
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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
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Health & Medical Sciences (AREA)
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Abstract
The invention discloses an upflow denitrification device and method based on sulfur autotrophy. The water inlet unit comprises a water inlet and a sulfur powder mixing device. The water inlet distribution units are uniformly distributed at the bottom of the device. The nitrogen-driving reaction unit is positioned at the lower end of the device and is used for removing total nitrogen in the sewage. The solid-liquid separator is positioned at the upper part of the nitrogen driving reaction unit and is provided with a circulating port. The sludge settling unit is positioned on the upper part of the device, the top of the device is a floating sludge cutting unit, and the sludge settling unit can be additionally provided with an inclined plate system to increase the settling effect. The equipment need not additionally to set up backwash system, and degree of automation is high, and total nitrogen clearance is high, and it is stable to go out water quality of water, and simple structure arranges the compactness, and area is little, and space utilization is high, and convenient operation need not the secondary and throws organic carbon source, and the utilization efficiency is high, is applicable to getting rid of total nitrogen among the sewage advanced treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment denitrification, in particular to an upflow denitrification device and method based on sulfur autoxidation reaction, which are suitable for removing total nitrogen in sewage advanced treatment.
Background
With the continuous and rapid growth of economy and the acceleration of urbanization process in China, the water environment problem becomes more and more severe. In recent years, due to the use of a large amount of chemical fertilizers, pesticides and the like and the change of the dietary structure of urban residents, nitrogen pollution in water is serious, and the over-high nitrogen concentration is one of the important reasons for water eutrophication. Eutrophication causes harm such as water quality reduction, water chromaticity increase, dissolved oxygen concentration reduction and the like, and even threatens human health.
At present, the ammonia nitrogen and the total nitrogen in effluent required by the urban sewage treatment plant can reach the first-class A standard (the limit values are 5mg/L and 15mg/L respectively) of pollutant discharge standard (GB 18918-. Sensitive water bodies such as Yangtze river drainage basins often have stricter requirements on inflow water quality than first-level A discharge standards. In the traditional sewage treatment, the problem that the content of total nitrogen in the sewage can reach the discharge standard is common at present, and in addition, a large amount of organic carbon sources are required to be added in the traditional denitrification process, so that the operation cost is greatly increased.
The sulfur self-oxygen denitrification does not need secondary addition of a carbon source, so that the problem is perfectly solved, but the existing sulfur self-oxygen implementing device mostly has the following problems:
1. sulfur powder and sewage can not be fully mixed, so that chalcogen bacteria in the reactor can not be fully absorbed, and the utilization rate of the sulfur powder is low;
2. the rising flow rate cannot be adjusted, the contact time of sludge and sulfur is insufficient, the effluent quality of sewage is unstable, and the water production efficiency is low;
3. nitrogen is generated by the system reaction, and sludge and sulfur powder of the upflow device can be deposited at the top end of the sedimentation zone to influence the water quality of the effluent of the device;
4. large occupied area, more accessory equipment and difficult realization of integration and miniaturization.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an upflow denitrification device and method under the condition of not adding a secondary carbon source, and solve the problems that the existing sulfur powder and sewage cannot be fully mixed, and the quality of effluent water is unstable due to the deposition of sludge at the top of an ascending flow velocity.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an upflow denitrification facility based on sulphur autotrophy, includes reactor, the unit of intaking, be the distribution unit of intaking, drives nitrogen reaction unit, solid-liquid separator in proper order from bottom to top in the reactor, the top sets up the overflow weir in the reactor, sets up the overflow hole on the overflow weir, and the distribution unit of intaking is connected to the unit of intaking.
Furthermore, the water inlet unit comprises an adding device and a pipeline mixer, the adding device comprises a sewage water inlet and a sulfur powder adding port, an outlet of the adding device is connected with an inlet of the pipeline mixer, and an outlet of the pipeline mixer is connected with a water inlet of the water inlet distribution unit.
Further, the line mixer comprises three sections, each section having a fixed helical blade twisted by 180 °.
Furthermore, the water inlet distribution unit comprises a plurality of straight pipes and a water distributor, the straight pipes are connected with the water inlet unit, and a plurality of first round holes are uniformly arranged on the pipe wall in the axial direction; the water distributor is arranged above the straight pipe, a plurality of second round holes are arranged on the water distributor, and the round holes are distributed from the center to the periphery and are gradually densified and symmetrically arranged.
Further, the distance between adjacent straight pipes is 100mm, the aperture of the first round hole is 15mm, and the center distance between adjacent first round holes is 100 mm; the aperture of the second round hole is 40mm, and the center distance between the adjacent second round holes is 100 mm.
Further, the central axis of the solid-liquid separator is coincident with the central axis of the upflow denitrification device, and the solid-liquid separator comprises a flow guide body, a mud bin and a liquid bin; a sludge settling area is arranged above the sludge bin.
Furthermore, the bottom end of the mud bin is provided with a circulation port, the circulation port is connected with an inlet of an external circulation pump, the feeding device further comprises a circulation water inlet, and an outlet of the external circulation pump is connected with the circulation water inlet.
Further, still include and float mud cutting unit, float mud cutting unit includes perforation aeration pipe and outside air source, and the perforation aeration pipe sets up in the mud sedimentation district, and its air inlet is connected outside air source.
Furthermore, the aperture of a third round hole on the perforated aeration pipe is 5mm, and the center distance between adjacent third round holes is 100 mm.
An upflow denitrification method based on sulfur autotrophy comprises the following steps:
step 1: adding sewage and sulfur powder into a feeding device, and fully mixing by a pipeline mixer;
step 2: uniformly feeding the mixed liquor into a nitrogen flooding reaction unit through a water inlet distribution unit, controlling the mixed liquor to stay in the nitrogen flooding reaction unit for 1-2 hours, fully reacting the mixed liquor with sludge in the nitrogen flooding reaction unit, and raising the sludge mixed liquor to a solid-liquid separator;
and step 3: the sludge mixed liquid is drained through the diversion body, part of the sludge mixed liquid flows out of the circulation port and is circulated to the nitrogen-expelling reaction unit through the circulating pump, the rest of the sludge mixed liquid is subjected to solid-liquid separation, the sludge enters the sludge bin, and the liquid enters the liquid bin;
and 4, step 4: part of sludge is gathered into blocks at the top end of the sludge bin, the sludge at the top end is aerated and cut into small blocks by the floating sludge cutting unit, and the small blocks are deposited downwards and fall into the nitrogen-expelling reaction unit;
and 5: the liquid in the water sump finally passes through the overflow weir upwards, is discharged from the overflow hole and is discharged from the water outlet through the water discharge channel.
Compared with the prior art, the invention has the following beneficial effects:
(1) high treatment efficiency and stable effluent quality. The device is provided with a circulating port, so that the problem of growth of small-particle sludge falling into the bottom is solved. Meanwhile, the rising flow velocity of the reaction zone is adjusted, the residence time of the reaction zone can be adjusted according to the reaction effect, and the stability of the effluent quality is ensured.
(2) The sludge concentration is high, and the water content of the sludge is reduced. And part of sludge particles after circulation increase flows back to the reaction zone through the solid-liquid separation device, and the rest of sludge particles rises to the top of the sludge bin, are cut by the aeration device and finally flow back to the reaction zone. The device does not need to be provided with a sludge discharge measure, and ensures high sludge concentration.
(3) The sulfur powder and the sewage can be used as sewage. The device is provided with a feeding device, a pipeline mixer, a water inlet distribution unit and three units for combined control, so that the sulfur powder and the sewage are fully mixed, and the utilization efficiency of the sulfur powder is improved.
(4) The integrated structure design is adopted, the structure is compact, the occupied area is small, the field arrangement is convenient, and under the condition of similar working conditions, a plurality of groups of devices can be connected in series for advanced treatment.
(5) Easy maintenance, simple operation and management. The system has the advantages of less equipment, effective floor area saving, automation control, capability of starting and stopping the system at any time, short starting time, and no operations such as backwashing, regeneration and the like.
(6) The invention has the advantages of advanced process, stable operation, simple operation, easy equipment management and operation, and strong practicability and economy.
(7) The method can be applied to the advanced treatment of sewage, and the total nitrogen index in sewage and wastewater is reduced under the condition of not adding a carbon source.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the line mixer.
The meaning of the individual reference symbols in the figures is: 1. a water inlet unit; 2. a feeding device; 3. a pipeline mixer; 4. a water inlet distribution unit; 5. a straight pipe; 6. a water distributor; 7. a nitrogen displacement reaction unit; 8. a sampling tube; 9. a solid-liquid separator; 10. a flow conductor; 11. a mud bin; 12. a liquid bin; 13. a circulation port; 14. a sludge precipitation unit; 15. a floating mud cutting unit; 16. an overflow weir; 17. an external circulation pump.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
as shown in FIG. 1, the upflow denitrification device based on sulfur autotrophy comprises a pipeline mixer 3, a nitrogen-driving reaction unit 7, a sludge precipitation unit 14, a solid-liquid separator 9, a water inlet distribution unit 4 and a floating sludge cutting unit 15.
The sulfur autotrophic denitrification refers to a process for completing denitrification and denitrification by using reduced sulfur as an electron donor, NO 3-N as an electron acceptor and an inorganic carbon source as a carbon source by sulfur autotrophic denitrification bacteria. During the process of sulfur autotrophic denitrification, about 4mg of alkalinity is consumed for every 1mg of NO3- -N removed, and a certain amount of sulfate is produced. The following formula is a sulfur autotrophic denitrification theoretical formula.
Sludge needs to be cultured in the early stage of the device. And (3) a culture domestication stage: the microorganisms used are taken from the strains and are started by culture using nitrogenous wastewater. After the sludge is cultured for about two weeks, sulfur is added into the sulfur autoxidation filter for enrichment culture, and the sludge with autotrophic property is domesticated and cultured. During the culture period, adding nutrient solution every two days and replacing supernatant, the main components of the nutrient solution are waste water mixed sodium carbonate and sulfur solution, the acclimation time is about 14d, and the NO of effluent is measured3And N is lower than 2mg/L, and the directional domestication of the autotrophic denitrification sludge is considered to be completed.
Based on the device, sewage, circulating water and sulfur powder enter the feeding device and are fully mixed through the pipeline mixer 3, the pipeline mixer 3 consists of three sections, and each section is provided with a fixed helical blade twisted by 180 degrees. The mixed liquid uniformly enters a nitrogen flooding reaction unit 7 through a water inlet distribution unit 4, the water inlet distribution unit 4 is composed of straight pipes 5 and a water distributor 6, the distance between the straight pipes 5 is 100mm, round holes with the aperture of 15mm are formed in the straight pipes 5, and the center distance of the round holes is 100 mm. The water distributor 6 is provided with round holes with the aperture of 40mm, the center distance of the round holes is 100mm, and the round holes are distributed from the center to the periphery and are gradually densified and symmetrically arranged. The mixed solution is evenly distributed with water and enters a nitrogen displacement reaction unit 7. The nitrogen-purging reaction unit 7 is required to control an appropriate upward flow rate, and a sampling port is provided at the top end thereof for measuring the upward flow rate. The nitrogen-driving reaction unit 7 needs to control the retention time of the wastewater to be 1-2 h, the mixed liquor and the sludge fully react in the nitrogen-driving reaction unit 7, and the mixed liquor rises to the solid-liquid separator 9.
The bottom end of the mud bin of the solid-liquid separator 9 is provided with a circulation port 13, and a part of the sludge mixed liquid flows out of the circulation port 13, circulates to the water inlet through an external circulation pump 17 and is mixed with sewage. The circulating system is arranged to control the ascending flow speed of the reaction zone in one part and reduce the occupied area by the circulating amount in the other part.
The solid-liquid separator 9 can adjust the height of the device, and the central axis of the device coincides with the central axis of the device. The sludge mixed liquid rises to a solid-liquid separator 9, is guided by a flow guide body 10, part of the sludge mixed liquid flows back to a nitrogen-driving reaction unit 7, the other mixed liquid is subjected to solid-liquid separation, the sludge is mixed and enters a sludge bin, and the liquid enters a water bin. The surface load of the sludge settling zone 14 should be less than 1m3/m2H. The total water depth of the sludge settling zone is more than 1.5 m. Part of the sludge is gathered into blocks at the top end of the sludge settling zone 14. The device is provided with an aeration device arranged at the top of the mud bin, the perforated aeration pipe is provided with round holes with the aperture of 5mm, and the center distance of the round holes is 100 mm. The top sludge is aerated and cut into small sludge blocks, and the sludge blocks are deposited downwards and fall into the reaction area.
The sump liquid eventually passes up the weir 16, drains from the overflow aperture, and drains through the drain outlet. The overflow weir 16 is provided with a water outlet hole with the aperture of 20mm and the distance between the holes of 250 mm.
Based on the device, the sewage treatment capacity is 2m3The water quality of the sewage inlet water is 28.4mg/L of total nitrogen, the water quality stability of the outlet water is less than 5mg/L, and the turbidity of the outlet water is less than 1 NTU. Thereby realizing the effect of removing the total nitrogen in the sewage advanced treatment.
Claims (10)
1. The upflow denitrification device based on sulfur autotrophy is characterized by comprising a reactor and a water inlet unit, wherein the reactor is internally provided with a water inlet distribution unit, a nitrogen driving reaction unit, a solid-liquid separator and an overflow weir from bottom to top in sequence, and the water inlet unit is connected with the water inlet distribution unit.
2. The upflow denitrification device based on sulfur autotrophy as claimed in claim 1, wherein the water inlet unit comprises a feeding device and a pipeline mixer, the feeding device comprises a sewage inlet and a sulfur powder feeding port, the outlet of the feeding device is connected with the inlet of the pipeline mixer, and the outlet of the pipeline mixer is connected with the water inlet of the water inlet distribution unit.
3. The sulfur autotrophic based upflow denitrification device as defined in claim 2, wherein the pipeline mixer comprises three sections, each section having a fixed helical blade twisted by 180 °.
4. The upflow denitrification device based on sulfur autotrophy as in claim 1, wherein the water inlet distribution unit comprises a plurality of straight pipes and a water distributor, the straight pipes are connected with the water inlet unit, and a plurality of first round holes are uniformly arranged on the pipe wall of the straight pipes in the axial direction; the water distributor is arranged above the straight pipe, a plurality of second round holes are arranged on the water distributor, and the round holes are distributed from the center to the periphery and are gradually densified and symmetrically arranged.
5. The upflow denitrification device based on sulfur autotrophy as in claim 4, wherein the distance between adjacent straight pipes is 100mm, the diameter of the first circular hole is 15mm, and the center distance between adjacent first circular holes is 100 mm; the aperture of the second round hole is 40mm, and the center distance between the adjacent second round holes is 100 mm.
6. The upflow denitrification device based on sulfur autotrophy as claimed in claim 1, wherein the central axis of the solid-liquid separator is coincident with the central axis of the upflow denitrification device, and comprises a flow guide body, a mud bin and a liquid bin; a sludge settling area is arranged above the sludge bin.
7. The upflow denitrification device based on sulfur autotrophy as recited in claim 2, wherein the bottom end of the sludge bin is provided with a circulation port, the circulation port is connected with an inlet of an external circulation pump, the adding device further comprises a circulation water inlet, and an outlet of the external circulation pump is connected with the circulation water inlet.
8. The upflow denitrification device based on sulfur autotrophy as claimed in claim 6, further comprising a float sludge cutting unit, wherein the float sludge cutting unit comprises a perforated aeration pipe and an external air source, the perforated aeration pipe is arranged in the sludge settling zone, and the air inlet of the perforated aeration pipe is connected with the external air source.
9. The upflow denitrification device based on sulfur autotrophy as claimed in claim 8, wherein the diameter of the third circular holes on the perforated aeration pipe is 5mm, and the distance between the centers of the adjacent third circular holes is 100 mm.
10. An upflow denitrification method based on sulfur autotrophy is characterized by comprising the following steps:
step 1: adding sewage and sulfur powder into a feeding device, and fully mixing by a pipeline mixer;
step 2: uniformly feeding the mixed liquor into a nitrogen flooding reaction unit through a water inlet distribution unit, controlling the mixed liquor to stay in the nitrogen flooding reaction unit for 1-2 hours, fully reacting the mixed liquor with sludge in the nitrogen flooding reaction unit, and raising the sludge mixed liquor to a solid-liquid separator;
and step 3: the sludge mixed liquid is drained through the diversion body, part of the sludge mixed liquid flows out of the circulation port and is circulated to the nitrogen-expelling reaction unit through the circulating pump, the rest of the sludge mixed liquid is subjected to solid-liquid separation, the sludge enters the sludge bin, and the liquid enters the liquid bin;
and 4, step 4: part of sludge is gathered into blocks at the top end of the sludge bin, the sludge at the top end is aerated and cut into small blocks by the floating sludge cutting unit, and the small blocks are deposited downwards and fall into the nitrogen-expelling reaction unit;
and 5: the liquid in the water sump finally passes through the overflow weir upwards, is discharged from the overflow hole and is discharged from the water outlet through the water discharge channel.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962224A (en) * | 2010-10-15 | 2011-02-02 | 上海交通大学 | Device for removing nitrogen through bio-autotrophic denitrification |
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