CN115572005A - Nitrogen-containing sewage treatment system and method for high-hardness and high-organic matters - Google Patents
Nitrogen-containing sewage treatment system and method for high-hardness and high-organic matters Download PDFInfo
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- CN115572005A CN115572005A CN202211170719.0A CN202211170719A CN115572005A CN 115572005 A CN115572005 A CN 115572005A CN 202211170719 A CN202211170719 A CN 202211170719A CN 115572005 A CN115572005 A CN 115572005A
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- 239000010865 sewage Substances 0.000 title claims abstract description 83
- 238000011282 treatment Methods 0.000 title claims abstract description 72
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010802 sludge Substances 0.000 claims abstract description 148
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 140
- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 238000005273 aeration Methods 0.000 claims abstract description 45
- 238000010992 reflux Methods 0.000 claims abstract description 31
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 20
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000001728 nano-filtration Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000000108 ultra-filtration Methods 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 238000006396 nitration reaction Methods 0.000 claims description 9
- 239000005416 organic matter Substances 0.000 claims description 9
- 239000002244 precipitate Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 241000894006 Bacteria Species 0.000 claims description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 7
- 239000004902 Softening Agent Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 21
- 239000012528 membrane Substances 0.000 description 16
- 206010021143 Hypoxia Diseases 0.000 description 9
- 208000005156 Dehydration Diseases 0.000 description 8
- 230000018044 dehydration Effects 0.000 description 8
- 238000006297 dehydration reaction Methods 0.000 description 8
- 239000006228 supernatant Substances 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005374 membrane filtration Methods 0.000 description 3
- 238000006213 oxygenation reaction Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005842 biochemical reaction Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000035484 reaction time Effects 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of industrial wastewater treatment, in particular to a nitrogen-containing sewage treatment system and method for high-hardness and high-organic matters. A water outlet pipe of the anoxic tank is provided with a jet aeration device; the aerobic tank is provided with a nitrifying liquid return pipe communicated with the anoxic tank; the liquid level in the aerobic tank is higher than that in the anoxic tank; a sludge reflux device is arranged between the fine filtration unit and the anoxic tank; the sludge dewatering device is communicated with a sludge discharge pipe of the softening reaction unit and a sludge discharge pipe of the fine filtration unit; the water outlet pipe of the sludge dewatering device and the water outlet pipe of the concentrated solution treatment device are communicated with the softening reaction unit. The jet aeration device can aerate water flow in the pipeline, and the aeration is more sufficient and efficient. The liquid level in the aerobic tank is higher than the liquid level in the anoxic tank, and the nitrifying liquid in the aerobic tank can flow back to the anoxic tank under the action of gravity.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a nitrogen-containing sewage treatment system and method for high-hardness and high-organic matters.
Background
The sewage comprises domestic sewage, factory wastewater, mine water and the like, the forms are various, the content difference of molecular substances such as organic elements, inorganic elements and the like in different sewage is large, and the sewage treatment modes have certain difference and need to be adapted according to the local conditions.
Aiming at the problems of sewage treatment of high-hardness soluble solid (the hardness can reach 1000 mg/L), high organic matter (the COD (chemical oxygen demand) represents 3500 mg/L) and high ammonia nitrogen (the ammonia nitrogen concentration can reach 4000 mg/L), in order to reach the standard of effluent discharge or reclaimed water recycling, membrane Biological Reactor (MBR) is usually adopted for advanced treatment for filtration, so that the hardness of the influent water is required to be reduced to below 200 mg/L; in order to ensure the removal effect of organic matters and ammonia nitrogen, a high-efficiency aeration oxygenating device is needed to ensure that aerobic bacteria in a biochemical system can fully degrade the organic matters and nitrification reaction can be fully carried out.
In order to improve the removal rate of organic matters and ammonia nitrogen, a common aeration and oxygenation device is often provided with a reflux pump with high energy consumption to realize large reflux of water in an aerobic pool, and aeration quantity is increased through a high-power fan, and the aeration and oxygenation system has the defects of high equipment cost and high energy consumption. In addition, for the existing A/O process (anoxic and aerobic process), the reflux of the aerobic tank to the anoxic tank is realized by pumping water and refluxing through a reflux pump, so the cost and the energy consumption are higher. Therefore, the development of an energy-saving and efficient nitrogen-containing wastewater treatment system with high hardness and high organic matters is of great significance.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a system and method for treating nitrogen-containing wastewater with high hardness and high organic content, which solves the technical problem of high energy consumption of the existing aeration oxygenation system.
(II) technical scheme
In order to achieve the above objects, the nitrogen-containing sewage treatment system for high hardness, high organic matter of the present invention comprises:
a softening reaction unit;
the water inlet pipe of the anoxic tank is communicated with the softening reaction unit;
the aerobic tank is communicated with the water outlet pipe of the anoxic tank, and a jet aeration device is arranged on the water outlet pipe of the anoxic tank; the aerobic tank is also provided with a nitrifying liquid return pipe communicated with the anoxic tank; the liquid level in the aerobic tank is higher than the liquid level in the anoxic tank, so that the nitrifying liquid in the aerobic tank can flow back to the anoxic tank under the action of gravity;
the fine filtration unit is communicated with a water outlet pipe of the aerobic tank, and a sludge reflux device is arranged between the fine filtration unit and the anoxic tank;
the sludge dewatering device is communicated with a sludge discharge pipe of the softening reaction unit and a sludge discharge pipe of the fine filtration unit; a water outlet pipe of the sludge dewatering device is communicated with the softening reaction unit;
and a water inlet pipe of the concentrated solution treatment device is communicated with the fine filtration unit, and a water outlet pipe of the concentrated solution treatment device is communicated with the softening reaction unit.
Optionally, the jet aeration device comprises a blower, a jet pump and a jet ejector; the water inlet pipe of the jet pump is communicated with the water outlet pipe of the anoxic pond, the water outlet of the jet pump is communicated with the water inlet pipe of the jet device, and the water outlet pipe of the jet device is communicated with the water inlet pipe of the aerobic pond; and the air outlet pipe of the air blower is communicated with the air inlet pipe of the ejector.
Optionally, a liquid level meter is arranged in each of the anoxic tank and the aerobic tank.
Optionally, the softening reaction unit comprises a regulating tank, a softening reaction tank and a primary sedimentation tank which are sequentially communicated; the adjusting tank is communicated with a water outlet pipe of the sludge dewatering device and a water outlet pipe of the concentrated solution treatment device; a chemical feeding pipe is arranged on the softening reaction tank; and the water outlet pipe of the primary sedimentation tank is communicated with the water inlet pipe of the anoxic tank, and the sludge discharge pipe of the primary sedimentation tank is communicated with the sludge inlet pipe of the sludge dewatering device.
Optionally, the softening agent put in the dosing pipe is industrial sodium carbonate.
Optionally, the fine filtration unit comprises a secondary sedimentation tank, an ultrafiltration device and a nanofiltration device which are communicated in sequence; the water inlet pipe of the secondary sedimentation tank is communicated with the water outlet pipe of the aerobic tank; the secondary sedimentation tank is provided with a first sludge discharge port and a second sludge discharge port, the first sludge discharge port is communicated with the sludge reflux device, and the second sludge discharge port is communicated with the sludge dewatering device; a sludge discharge port of the ultrafiltration device is communicated with the sludge reflux device; the nanofiltration device is communicated with a water inlet pipe of the concentrated solution treatment device.
Optionally, the sludge return device comprises a first sludge return pipe, a second sludge return pipe and a sludge return pump; the first sludge return pipe communicates the anoxic tank with the secondary sedimentation tank; the second sludge return pipe is used for communicating the anoxic tank with the ultrafiltration device; the first sludge return pipe and the second sludge return pipe are both provided with the sludge return pump.
Optionally, the sludge dewatering device can be used for carrying out landfill treatment on the dried sludge after dewatering the sludge until the water content is lower than 60%.
Optionally, the return amount of the nitrifying liquid in the nitrifying liquid return pipe is 300-400%.
Further, the present invention also provides a method for treating nitrogen-containing sewage for high hardness and high organic matters, which is implemented based on the nitrogen-containing sewage treatment system for high hardness and high organic matters as described above, and comprises the following steps:
tempering, regulating quantity and softening: conveying nitrogen-containing sewage with high hardness and high organic matters to the softening reaction unit, collecting the sewage by the softening reaction unit, and regulating the quality; adding a softening agent into the softening reaction unit to enable hardness ions to perform chemical reaction to form precipitates, and then performing sludge-water separation; sludge generated in the softening reaction unit is discharged into the sludge dewatering device for dewatering treatment, and clear liquid in the softening reaction unit enters the anoxic tank;
denitrification treatment: in the anoxic pond, denitrifying denitrification reaction is carried out through denitrifying bacteria, and nitrate nitrogen is converted into nitrogen to be discharged;
nitration treatment: delivering the effluent of the anoxic tank to the jet aeration device, fully mixing the effluent with compressed air of the jet aeration device, then delivering the jet to the aerobic tank, carrying out nitration reaction on the sewage containing dissolved oxygen in the aerobic tank by nitrifying bacteria, and converting ammonia nitrogen in the sewage into nitrate nitrogen; degrading organic matters in the sewage into carbon dioxide and water;
meanwhile, part of nitrified liquid in the aerobic tank flows back to the anoxic tank through a nitrified liquid return pipe to perform denitrification reaction, so that the total nitrogen content in the sewage is reduced;
sludge treatment: the effluent of the aerobic tank enters the fine filtering unit for sludge-water separation, one part of sludge generated by the fine filtering unit flows back to the anoxic tank through the sludge backflow device, the other part of sludge is discharged into the sludge dewatering device for dewatering treatment, and the dry sludge is transported to the outside for landfill after dewatering; clear liquid of the sludge dewatering device flows back to the softening reaction unit;
clear liquid filtration treatment: filtering the clear liquid obtained after the mud-water separation of the fine filtering unit for multiple times, and discharging the filtered effluent after reaching the standard or recycling the reclaimed water; returning the sludge filtered by the fine filtering unit to the anoxic tank; and the concentrated solution in the fine filtration unit enters a concentrated solution treatment device for treatment and then flows back to the softening reaction unit.
(III) advantageous effects
The beneficial effects of the invention are: the softening reaction unit can soften high-hardness substances in the sewage, so that the softened high-hardness substances can be filtered by the MBR membrane reactor and the fine filtration unit, the hard substances are prevented from blocking membrane holes, and the high-efficiency stable operation of the MBR membrane and the fine filtration membrane is ensured.
Compared with the prior art that the whole aerobic tank is aerated by a fan, the jet aeration device is arranged on the pipeline, so that the water flow in the pipeline can be directly aerated, and the aeration is more sufficient and efficient; and the situation that the aeration of the aerobic tank is insufficient or too sufficient as the existing aeration mode is avoided, and the jet aeration device is arranged on the pipeline to control the aeration rate in the aerobic tank more easily.
The liquid level in the good oxygen pond is higher than the liquid level in the oxygen deficiency pond to make the liquid of nitrifying in the good oxygen pond can flow back to the oxygen deficiency pond under the action of gravity, utilized the linker principle promptly, thereby make the water in the good oxygen pond can be impressed in the oxygen deficiency pond by atmospheric pressure, and need not additionally to draw water through the backwash pump and carry out big backward flow, more energy-conserving, economy and practicality.
The sewage treatment system firstly softens the sewage and reasonably utilizes resources; the jet aeration device is used for fully aerating the sewage, so that the removal rate of organic matters and the efficiency of nitration reaction in the aerobic tank are improved, the efficiency of denitrification reaction in the anoxic tank is indirectly improved, and the high-efficiency removal of total nitrogen in the sewage is realized; and finally, the sludge and the water are fully separated by the fine filtration unit, the sludge is discharged or reclaimed water is recycled after the water quality reaches the standard, the sludge is buried after dehydration, and the supernatant after the sludge dehydration flows back to the softening reaction unit to continue purifying the water quality, so that the water yield brought by the sludge burying is reduced, and the water yield of the discharged or reclaimed water after the water quality reaches the standard is ensured. The sewage treatment system realizes reasonable planning and utilization of resources, has the advantages of stable operation, good water outlet effect, economy, high efficiency, energy conservation and the like, and meets the requirement of sustainable development.
Drawings
FIG. 1 is a process flow diagram of a nitrogen-containing wastewater treatment system for high hardness and high organic matters according to the present invention;
fig. 2 is a schematic structural view of the jet aeration apparatus of the present invention.
[ instruction of reference ]
1: a regulating reservoir; 2: a softening reaction tank; 3: a primary sedimentation tank; 4: an anoxic tank; 5: an aerobic tank; 6: a secondary sedimentation tank; 7: an ultrafiltration device; 8: a nanofiltration device; 9: a sludge dewatering device; 10: a concentrated solution treatment device; 11: a jet pump; 12: an ejector; 13: a blower; 14: a nitrifying liquid return pipe.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; "connected" may be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the present invention provides a nitrogen-containing sewage treatment system for high hardness and high organic matters, which includes a softening reaction unit, an anoxic tank 4, an aerobic tank 5, a fine filtration unit, a sludge dewatering device 9, and a concentrated solution treatment device 10. The water inlet pipe of the anoxic tank 4 is communicated with the softening reaction unit; the aerobic tank 5 is communicated with a water outlet pipe of the anoxic tank 4, and a jet aeration device is arranged on the water outlet pipe of the anoxic tank 4; the aerobic tank 5 is also provided with a nitrifying liquid return pipe 14 communicated with the anoxic tank 4; the liquid level in the aerobic tank 5 is higher than that in the anoxic tank 4, so that the nitrifying liquid in the aerobic tank 5 can flow back to the anoxic tank 4 under the action of gravity; the fine filtration unit is communicated with a water outlet pipe of the aerobic tank 5, and a sludge reflux device is arranged between the fine filtration unit and the anoxic tank 4; the sludge dewatering device 9 is communicated with a sludge discharge pipe of the softening reaction unit and a sludge discharge pipe of the fine filtration unit; a water outlet pipe of the sludge dewatering device 9 is communicated with the softening reaction unit; the water inlet pipe of the concentrated solution treatment device 10 is communicated with the fine filtration unit, and the water outlet pipe of the concentrated solution treatment device 10 is communicated with the softening reaction unit.
The softening reaction unit can soften high-hardness substances in sewage, so that the high-hardness substances can be filtered by a biomembrane method after being softened, the high-hardness substances can be filtered by the MBR membrane reactor and the fine filtration unit, the membrane holes are prevented from being blocked by the hardness substances, and the high-efficiency stable operation of the MBR membrane and the fine filtration membrane is ensured. Compared with the prior art that the water in the aerobic tank 5 is aerated by a fan, the jet aeration device is arranged on the pipeline and can directly aerate the water flow in the pipeline, and because the water in the water pipe flows in a single direction, the jet aeration device can always aerate the un-aerated water flow, namely, directly aerate the water flow flowing out of the anoxic tank 4, so that the aeration is more sufficient and efficient; and the situation that the aeration of the aerobic tank 5 is insufficient or is too sufficient like the existing aeration mode can not be caused, and the jet aeration device is arranged on the pipeline to easily control the aeration quantity in the aerobic tank 5. The liquid level in the good oxygen pond 5 is higher than the liquid level in the oxygen deficiency pond 4 to make the liquid of nitrifying in the good oxygen pond 5 can flow back to in the oxygen deficiency pond 4 under the action of gravity, utilized the linker principle promptly, thereby make the water in the good oxygen pond 5 can be impressed in the oxygen deficiency pond 4 by atmospheric pressure, and need not additionally to draw water through the backwash pump and carry out big backward flow, more energy-conserving, economy and practicality.
The sewage treatment system firstly softens the sewage and reasonably utilizes resources; the jet aeration device is used for fully aerating the sewage, so that the removal rate of organic matters in the aerobic tank 5 and the efficiency of nitration reaction are improved, the efficiency of denitrification reaction in the anoxic tank 4 is indirectly improved, and the high-efficiency removal of total nitrogen in the sewage is realized; and finally, the sludge and the water are fully separated by the fine filtration unit, the sludge is discharged or reclaimed water is recycled after the water quality reaches the standard, the sludge is buried after dehydration, and the supernatant after the sludge dehydration flows back to the softening reaction unit to continue purifying the water quality, so that the water yield brought by the sludge burying is reduced, and the water yield of the discharged or reclaimed water after the water quality reaches the standard is ensured. The sewage treatment system realizes reasonable planning and utilization of resources, has the advantages of stable operation, good water outlet effect, economy, high efficiency, energy conservation and the like, and meets the requirement of sustainable development.
As shown in fig. 2, the jet aeration apparatus includes a blower 13, a jet pump 11, and a jet device 12; a water inlet pipe of the jet pump 11 is communicated with a water outlet pipe of the anoxic tank 4, a water outlet of the jet pump 11 is communicated with a water inlet pipe of the jet device 12, and a water outlet pipe of the jet device 12 is communicated with a water inlet pipe of the aerobic tank 5; the air outlet pipe of the blower 13 is communicated with the air inlet pipe of the ejector 12. Specifically, the jet pump 11 is used for pumping the sewage in the anoxic tank 4 to the jet device 12; the ejector 12 can sufficiently mix the sewage pumped by the ejector 11 with the compressed air delivered by the blower 13 and deliver the mixed sewage into the aerobic tank 5. In addition, the existing aeration mode is to directly aerate the aerobic tank 5 by a fan, and the over-large volume of the aerobic tank 5 easily causes the situation of too little or excessive aeration amount of sewage in the tank, thereby influencing the nitration reaction and the degradation efficiency of organic matters; or on the basis of the fan, a high-power reflux pump is arranged and is used for stirring the sewage in the aerobic tank 5, so that the equal aeration quantity of each part of the water body is ensured, but the energy consumption is higher, and the water purification cost is overhigh. The invention aerates in the pipeline, and because the cross-sectional area of the water pipe is much smaller than that of the aerobic tank 5, the sewage flowing through the ejector 12 can be fully aerated, which is beneficial to the high-efficiency reaction in the tank; the sewage flowing through the aerobic tank 5 is aerated by the jet aeration device, the aeration rate is uniform, and a high-power reflux pump is not required to be arranged for stirring. In a more preferred embodiment, the control center adjusts the rotation speed of the blower 13 according to the water flow in the water outlet pipe of the anoxic tank 4, so that the sewage in the unit volume of the water outlet pipe can be mixed with the air delivered by the blower 13 according to a preset proportion, thereby accurately controlling the aeration amount in the aerobic tank 5 and facilitating the reaction in the aerobic tank 5.
Furthermore, liquid level meters are arranged in the anoxic tank 4 and the aerobic tank 5. Specifically, any pipeline of the invention can be provided with a liquid level meter (or a flow meter) and a regulating valve, wherein the liquid level meter is used for detecting the liquid level in the reaction tank, and the regulating valve is used for regulating the flow of the water body; the liquid level meter and the regulating valve are electrically connected with the control center, the liquid level meter transmits liquid level information to the control center in real time, and the control center controls the opening degree of the valve of the automatic liquid level control regulating valve according to the current water pool, so that the flow of water is controlled, and finally the water level in the reaction pool is controlled within a predicted water level range. The way of controlling the circuit between the level gauge (or flow meter), the regulating valve and the control center is prior art and is not within the scope of the present invention.
This application is through the level gauge, the governing valve, the liquid level in the oxygen deficiency pond 4 and the good oxygen pond 5 is adjusted to control center, when the liquid level in the good oxygen pond 5 is greater than the liquid level in the oxygen deficiency pond 4, because the linker principle, when the valve that nitrifies liquid back flow 14 is opened, sewage in the good oxygen pond 5 can be impressed in the oxygen deficiency pond 4 by atmospheric pressure, realize the natural reflux of sewage, do not need extra rethread backwash pump to draw water the backward flow, thereby sewage treatment system's equipment cost has been reduced. Meanwhile, the water pumping power and the water pumping flow of a common reflux pump are limited, or a reflux pump with ultrahigh power is used for large reflux, so that the power consumption is overlarge, and the setting cost of the reflux pump is overhigh; the reflux of the invention is that the sewage in the aerobic tank 5 can be pressed into the anoxic tank 4 by the atmospheric pressure by utilizing the force of the nature until the liquid levels of the aerobic tank 5 and the anoxic tank 4 are leveled, the large reflux of the sewage can be rapidly realized, and the energy conservation and the high efficiency are really realized without the help of an ultrahigh-power reflux pump.
Secondly, the softening reaction unit comprises an adjusting tank 1, a softening reaction tank 2 and a primary sedimentation tank 3 which are communicated in sequence; the adjusting tank 1 is communicated with a water outlet pipe of a sludge dewatering device 9 and a water outlet pipe of a concentrated solution treatment device 10; a dosing pipe is arranged on the softening reaction tank 2; the water outlet pipe of the primary sedimentation tank 3 is communicated with the water inlet pipe of the anoxic tank 4, and the sludge discharge pipe of the primary sedimentation tank 3 is communicated with the sludge inlet pipe of the sludge dewatering device 9. Specifically, equalizing basin 1 is used for the quenching and tempering volume regulation of sewage, adjusts quality of water and discharge promptly, and equalizing basin 1 can carry out the prefilter to sewage, filters suspended solid, macromolecular material etc. in the sewage, can avoid the situation that the rear end pipeline takes place to block up effectively. The softening reaction tank 2 adopts the existing MBR membrane filtration technology, and the softened high-hardness substances can also pass through the biological membrane filtration rear-end device by softening the high-hardness substances in the sewage, so that the blockage of membrane pores by the high-hardness substances is effectively avoided, and the sewage filtration efficiency is ensured. The primary sedimentation tank 3 is used for further filtering sewage, conveying the filtered sludge to the sludge dewatering device 9, and conveying the filtered supernatant to the anoxic tank 4, so that the situation that a rear-end pipeline is blocked is further reduced. The invention combines the softening reaction tank 2 and the A/O process into a set of sewage treatment system, and compared with the prior art which separately separates high-hardness substances and then treats the substances, the device has lower setting cost and more convenient and efficient integrated setting and use.
In addition, the softening agent put into the dosing pipe is industrial sodium carbonate. The sodium carbonate can not only lead the hardness ions to generate chemical reaction to form deposition (softening), but also lead the deposition to be subjected to mud-water separation by the primary sedimentation tank 3; can also be an inorganic carbon source of denitrifying bacteria, and the sludge generated by the reaction is less; meanwhile, the products after the biochemical reaction of the sodium carbonate are carbon dioxide and water, so that the reaction products can be conveniently treated, the added sodium carbonate can be effectively decomposed, secondary pollutants are effectively prevented from being generated, and the water purification quality of the sewage is further ensured.
Further, the fine filtration unit comprises a secondary sedimentation tank 6, an ultrafiltration device 7 and a nanofiltration device 8 which are communicated in sequence; the water inlet pipe of the secondary sedimentation tank 6 is communicated with the water outlet pipe of the aerobic tank 5; the secondary sedimentation tank 6 is provided with a first sludge discharge port and a second sludge discharge port, the first sludge discharge port is communicated with the sludge reflux device, and the second sludge discharge port is communicated with the sludge dewatering device 9; a sludge discharge port of the ultrafiltration device 7 is communicated with a sludge reflux device; the nanofiltration device 8 is communicated with a water inlet pipe of a concentrated solution treatment device 10. Specifically, the secondary sedimentation tank 6 is used for further filtering the effluent of the aerobic tank 5 so as to reduce the sedimentation entering the ultrafiltration device 7 and the nanofiltration device 8; layered precipitates (with low density) and compressed precipitates (with high density) exist in the secondary sedimentation tank 6, the layered precipitates are returned to the anoxic tank 4, the compressed precipitates are conveyed to the sludge dewatering device 9 for dewatering, and the dewatered supernatant is returned to the regulating tank 1, so that the sludge and water in the secondary sedimentation tank 6 are fully separated, the discharge of the water in the sludge is reduced, and the purified water yield of the fine filtration unit is finally ensured.
Secondly, the sludge reflux device comprises a first sludge reflux pipe, a second sludge reflux pipe and a sludge reflux pump; the first sludge return pipe communicates the anoxic tank 4 with the secondary sedimentation tank 6; the second sludge return pipe communicates the anoxic tank 4 with the ultrafiltration device 7; and the first sludge return pipe and the second sludge return pipe are both provided with sludge return pumps. Specifically, the ultrafiltration device 7 and the nanofiltration device 8 are conventional MBR membrane filtration equipment, and the pore diameter of an ultrafiltration membrane of the ultrafiltration device 7 is larger than that of a nanofiltration membrane of the nanofiltration device 8, so that layered filtration of precipitates in sewage is realized, different reflux treatments are performed on the precipitates, and the effluent quality of the nanofiltration device 8 is ensured.
In addition, the sludge dewatering device 9 can dewater the sludge until the water content is lower than 60%, and then transport the dried sludge to landfill. Specifically, the lower the sludge dewatering amount is, the more convenient the sludge transportation is, but the corresponding dewatering cost is also increased, and the sludge dewatering amount can be set according to actual needs.
Further, the return flow of the nitrifying liquid in the nitrifying liquid return pipe 14 is 300-400%. The nitrified liquid contains nitrate nitrogen, and the nitrate nitrogen can generate denitrification reaction in the anoxic tank 4 to produce nitrogen, so that the total nitrogen content in the sewage is reduced. The content of nitrate nitrogen in the aerobic tank 5 is therefore directly related to the nitrogen removal efficiency in the anoxic tank 4, whereas the content of nitrate nitrogen is related to the amount of aeration in the aerobic tank 5. The jet aeration device of the invention finally improves the efficiency of removing the total nitrogen in the sewage by improving the aeration quantity in the aerobic tank 5. And sufficient aeration quantity in the aerobic tank 5 also improves the degradation efficiency of the organic matters, and the main reason is that the metabolism of aerobic microorganisms in the aerobic tank 5 is accelerated when the aeration quantity is sufficient, and the metabolism of the aerobic microorganisms needs to absorb the organic matters, so that the degradation of the organic matters in the sewage can be accelerated.
In addition, the invention also provides a method for treating the nitrogen-containing sewage with high hardness and high organic matters, which is implemented based on a nitrogen-containing sewage treatment system for the high hardness and high organic matters, and comprises the following steps:
tempering, regulating quantity and softening: conveying nitrogen-containing sewage with high hardness and high organic matters to an adjusting tank 1, collecting the sewage through the adjusting tank 1, and regulating the quality; adding a softening agent into the softening reaction tank 2 to enable the hardness ions to perform chemical reaction to form precipitates and soften; sludge-water separation is carried out in the primary sedimentation tank 3, sludge generated in the primary sedimentation tank 3 is discharged into a sludge dewatering device 9 for dewatering treatment, and clear liquid in the primary sedimentation tank 3 enters an anoxic tank 4;
denitrifying denitrification treatment: in the anoxic pond 4, denitrifying denitrification reaction is carried out through denitrifying bacteria, and nitrate nitrogen is converted into nitrogen to be discharged;
nitration treatment: delivering the effluent of the anoxic tank 4 to an ejector 12, fully mixing the compressed air delivered by an air blower 13 with the sewage by the ejector 12, delivering the jet into the aerobic tank 5, carrying out nitration reaction on the sewage containing dissolved oxygen in the aerobic tank 5 by nitrifying bacteria, and converting ammonia nitrogen in the sewage into nitrate nitrogen; degrading organic matters in the sewage into carbon dioxide and water by aerobic microorganisms;
meanwhile, part of the nitrified liquid in the aerobic tank 5 flows back to the anoxic tank 4 through the nitrified liquid return pipe 14 to carry out denitrification reaction, so that the total nitrogen content in the sewage is reduced;
sludge treatment: the effluent of the aerobic tank 5 enters a secondary sedimentation tank 6 for mud-water separation, a part of sludge (stratified sediment) generated by the secondary sedimentation tank 6 flows back to the anoxic tank 4 through a first sludge return pipe, the other part of sludge (compressed sediment) is discharged into a sludge dewatering device 9 for dewatering treatment, and the dried sludge is transported to the outside for landfill; clear liquid of the sludge dewatering device 9 flows back to the adjusting tank 1;
clear liquid filtration treatment: filtering clear liquid obtained after mud-water separation in the secondary sedimentation tank 6 through an ultrafiltration device 7 and a nanofiltration device 8 in sequence, and discharging filtered effluent after reaching the standard or recycling reclaimed water; returning the sludge filtered by the ultrafiltration device 7 to the anoxic tank 4; and the concentrated solution in the nanofiltration device 8 enters a concentrated solution treatment device 10 for treatment and then flows back to the regulating tank 1. Specifically, the aperture of the ultrafiltration membrane in the ultrafiltration device 7 is between 0.01 and 0.002 micron, and the aperture of the nanofiltration membrane in the nanofiltration device 8 is less than 0.001 micron, and can be set according to actual requirements. The invention sequentially passes through the secondary sedimentation tank 6, the ultrafiltration device 7 and the nanofiltration device 8 for filtration, the filtration pore diameter is from large to small, molecular substances with different outer diameters can be intercepted in batches, and the molecular substances with corresponding outer diameters flow back to corresponding upper working procedures, such as the layered precipitation and the compressed precipitation of the secondary sedimentation tank 6 are respectively refluxed. In addition, the concentrated solution in the nanofiltration device 8 is the residual solution trapped by the nanofiltration membrane after the biological degradation of the sewage percolate, and needs to be discharged into a concentrated solution treatment device 10 for further treatment, and the existing treatment modes comprise advanced oxidation technology, evaporation, membrane distillation and the like.
According to the invention, by arranging the plurality of sewage backflow pipelines and the sludge backflow pipeline, molecular substances in the original wastewater can fully participate in biochemical reaction, so that the purification quality of the sewage is improved; and the sewage treatment system carries out dehydration treatment before the sludge is buried, supernatant after the dehydration treatment is returned to the regulating tank 1, and the supernatant of the dehydration sludge dehydration device 9 contains not only molecular substances and microorganisms which are not fully reacted, but also clear water which does not reach the discharge standard. And (3) refluxing the supernatant into the regulating tank 1 to prolong the reaction time of the molecular substances which are not fully reacted, and continuously decomposing the molecular substances by the microorganisms to ensure that the refluxed supernatant reaches the discharge standard, so that the amount of water brought out during sludge landfill can be reduced, and the water yield of the effluent reaching the standard or recycled water is finally ensured.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (10)
1. A nitrogen-containing wastewater treatment system for high hardness, high organic matter, the wastewater treatment system comprising:
a softening reaction unit;
the water inlet pipe of the anoxic tank (4) is communicated with the softening reaction unit;
the aerobic tank (5) is communicated with a water outlet pipe of the anoxic tank (4), and a jet aeration device is arranged on the water outlet pipe of the anoxic tank (4); the aerobic tank (5) is also provided with a nitrifying liquid return pipe (14) communicated with the anoxic tank (4); the liquid level in the aerobic tank (5) is higher than the liquid level in the anoxic tank (4) so that the nitrifying liquid in the aerobic tank (5) can flow back to the anoxic tank (4) under the action of gravity;
the fine filtration unit is communicated with a water outlet pipe of the aerobic tank (5), and a sludge reflux device is arranged between the fine filtration unit and the anoxic tank (4);
the sludge dewatering device (9), the sludge dewatering device (9) is communicated with the sludge discharge pipe of the softening reaction unit and the sludge discharge pipe of the fine filtration unit; a water outlet pipe of the sludge dewatering device (9) is communicated with the softening reaction unit;
the water inlet pipe of the concentrated solution treatment device (10) is communicated with the fine filtering unit, and the water outlet pipe of the concentrated solution treatment device (10) is communicated with the softening reaction unit.
2. The nitrogen-containing sewage treatment system for high hardness and high organic matters according to claim 1, wherein the jet aeration device comprises a blower (13), a jet pump (11) and a jet ejector (12); a water inlet pipe of the jet pump (11) is communicated with a water outlet pipe of the anoxic tank (4), a water outlet of the jet pump (11) is communicated with a water inlet pipe of the jet device (12), and a water outlet pipe of the jet device (12) is communicated with a water inlet pipe of the aerobic tank (5); and the air outlet pipe of the air blower (13) is communicated with the air inlet pipe of the ejector (12).
3. The nitrogen-containing sewage treatment system for high hardness and high organic matters according to claim 1 or 2, wherein a liquid level meter is provided in each of the anoxic tank (4) and the aerobic tank (5).
4. The nitrogen-containing sewage treatment system for high hardness and high organic matters according to claim 1 or 2, wherein the softening reaction unit comprises a regulating tank (1), a softening reaction tank (2) and a primary settling tank (3) which are communicated in sequence; the adjusting tank (1) is communicated with a water outlet pipe of the sludge dewatering device (9) and a water outlet pipe of the concentrated solution treatment device (10); a dosing pipe is arranged on the softening reaction tank (2); the water outlet pipe of the primary sedimentation tank (3) is communicated with the water inlet pipe of the anoxic tank (4), and the sludge discharge pipe of the primary sedimentation tank (3) is communicated with the sludge inlet pipe of the sludge dewatering device (9).
5. The nitrogen-containing sewage treatment system for high hardness and high organic matter according to any one of claim 4, wherein the softening agent put into the dosing pipe is industrial sodium carbonate.
6. The nitrogen-containing sewage treatment system for high hardness and high organic matters as claimed in claim 1 or 2, wherein the fine filtration unit comprises a secondary sedimentation tank (6), an ultrafiltration device (7) and a nanofiltration device (8) which are communicated in sequence; the water inlet pipe of the secondary sedimentation tank (6) is communicated with the water outlet pipe of the aerobic tank (5); the secondary sedimentation tank (6) is provided with a first sludge discharge port and a second sludge discharge port, the first sludge discharge port is communicated with the sludge reflux device, and the second sludge discharge port is communicated with the sludge dewatering device (9); a sludge discharge port of the ultrafiltration device (7) is communicated with the sludge reflux device; the nanofiltration device (8) is communicated with a water inlet pipe of the concentrated solution treatment device (10).
7. The nitrogen-containing sewage treatment system for high hardness and high organic matter according to claim 6, wherein the sludge return means comprises a first sludge return pipe, a second sludge return pipe and a sludge return pump; the first sludge return pipe communicates the anoxic tank (4) with the secondary sedimentation tank (6); the second sludge return pipe is used for communicating the anoxic tank (4) with the ultrafiltration device (7); the first sludge return pipe and the second sludge return pipe are both provided with the sludge return pump.
8. The nitrogen-containing sewage treatment system for high hardness and high organic matter according to claim 1 or 2, wherein the sludge dewatering device (9) is capable of transporting the dried sludge out to a landfill after dewatering the sludge to a water content of less than 60%.
9. The nitrogen-containing sewage treatment system for high hardness and high organic matter according to claim 1 or 2, wherein the return flow amount of nitrifying liquid in the nitrifying liquid return pipe (14) is 300-400%.
10. A method for treating nitrogen-containing wastewater for high hardness and high organic matter, which is implemented based on the nitrogen-containing wastewater treatment system for high hardness and high organic matter according to any one of claims 1 to 9, and which comprises the steps of:
tempering, regulating quantity and softening: conveying nitrogen-containing sewage with high hardness and high organic matters to the softening reaction unit, and collecting the sewage through the softening reaction unit and regulating the quality; adding a softening agent into the softening reaction unit to enable hardness ions to perform chemical reaction to form precipitates, and then performing sludge-water separation; sludge generated in the softening reaction unit is discharged into the sludge dewatering device (9) for dewatering treatment, and clear liquid in the softening reaction unit enters the anoxic tank (4);
denitrifying denitrification treatment: in the anoxic pond (4), denitrifying denitrification reaction is carried out through denitrifying bacteria, and nitrate nitrogen is converted into nitrogen to be discharged;
nitration treatment: delivering the effluent of the anoxic tank (4) to the jet aeration device, fully mixing the effluent with compressed air of the jet aeration device, and then delivering the effluent to the aerobic tank (5) in a jet manner, wherein sewage containing dissolved oxygen is subjected to nitration reaction in the aerobic tank (5) by nitrifying bacteria, and ammonia nitrogen in the sewage is converted into nitrate nitrogen; degrading organic matters in the sewage into carbon dioxide and water;
meanwhile, part of nitrified liquid in the aerobic tank (5) flows back to the anoxic tank (4) through a nitrified liquid return pipe (14) to carry out denitrification reaction, so that the total nitrogen content in the sewage is reduced;
sludge treatment: the effluent of the aerobic tank (5) enters the fine filtering unit for sludge-water separation, one part of sludge generated by the fine filtering unit flows back into the anoxic tank (4) through the sludge backflow device, the other part of sludge is discharged into the sludge dewatering device (9) for dewatering treatment, and the dry sludge is transported to the outside for landfill after dewatering; clear liquid of the sludge dewatering device (9) flows back to the softening reaction unit;
clear liquid filtration treatment: filtering the clear liquid obtained after the sludge-water separation of the fine filtering unit for multiple times, and discharging the filtered effluent after reaching the standard or recycling the effluent; returning the sludge filtered by the fine filtering unit to the anoxic tank (4); and the concentrated solution in the fine filtration unit enters a concentrated solution treatment device (10) for treatment and then flows back to the softening reaction unit.
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