CN116282728A - Advanced denitrification and dephosphorization treatment process for sewage - Google Patents
Advanced denitrification and dephosphorization treatment process for sewage Download PDFInfo
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- CN116282728A CN116282728A CN202310329177.5A CN202310329177A CN116282728A CN 116282728 A CN116282728 A CN 116282728A CN 202310329177 A CN202310329177 A CN 202310329177A CN 116282728 A CN116282728 A CN 116282728A
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- dephosphorization
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- 239000010865 sewage Substances 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000010802 sludge Substances 0.000 claims abstract description 170
- 238000001914 filtration Methods 0.000 claims abstract description 59
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000004062 sedimentation Methods 0.000 claims abstract description 39
- 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 abstract description 34
- 239000006228 supernatant Substances 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 230000020477 pH reduction Effects 0.000 claims abstract description 18
- 230000007062 hydrolysis Effects 0.000 claims abstract description 16
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims description 46
- 238000006396 nitration reaction Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- 239000011574 phosphorus Substances 0.000 claims description 13
- 238000004659 sterilization and disinfection Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 10
- 230000001546 nitrifying effect Effects 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 239000000701 coagulant Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000645 desinfectant Substances 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000000382 dechlorinating effect Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 238000012856 packing Methods 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 230000001651 autotrophic effect Effects 0.000 description 8
- 239000008394 flocculating agent Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 230000001954 sterilising effect Effects 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003206 sterilizing agent Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
-
- 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
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage deep denitrification and dephosphorization treatment process, which comprises the following steps of S1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage; s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank. S3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, nitrate nitrogen in the sludge in the sedimentation tank reflowed from the sludge separation system and organic matters in the sewage are subjected to denitrification reaction, and the nitrate nitrogen can be reduced into nitrogen for denitrification. The invention has the beneficial effects that: through add filtering ponds and pre-denitration pond before the anaerobic tank, the suspended solid in the sewage can be filtered to the filtering ponds, and pre-denitration pond can make from the interior nitrate nitrogen in the mud that flows back of sedimentation tank carry out denitrification reaction with sewage, then the inside that flows back the mud reentrant anaerobic tank carries out biological dephosphorization reaction with sewage again, avoids the interference of nitrate nitrogen in the return mud to the dephosphorization.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage deep denitrification and dephosphorization treatment process.
Background
Sewage treatment, which is widely applied to various fields such as construction, agriculture, traffic, energy, petrochemical industry, environmental protection, urban landscapes, medical treatment, catering and the like, is increasingly carried into the daily life of common people in order to achieve the process of purifying sewage discharged into a certain water body or reused water quality requirement, and needs to denitrify and dephosphorize the sewage during sewage treatment.
A synchronous denitrification and dephosphorization sewage treatment process with the bulletin number of CN110606626U and the bulletin date of 2021.12.21, which is characterized by comprising the following steps of; firstly, sewage containing nitrate and phosphate enters a chemical phosphorus removal section (A) to remove the phosphate; one part of the effluent water of the chemical dephosphorization section (A) enters the heterotrophic denitrification section (B), and the other part enters the autotrophic denitrification section (C); the sewage entering the heterotrophic denitrification section (B) is subjected to heterotrophic denitrification, residual sludge generated in the heterotrophic denitrification section (B) is discharged to the autotrophic denitrification section (C), and all effluent of the heterotrophic denitrification section (B) is collected into a main pipe to be discharged; the sewage entering the autotrophic denitrification section (C) is subjected to autotrophic denitrification, and the surplus sludge from the heterotrophic denitrification section (B) is subjected to autotrophic denitrification in the autotrophic denitrification section (C) to realize denitrification; the sludge generated in the autotrophic nitrogen removal section (C) flows back to the chemical phosphorus removal section (A), and the sewage generated in the autotrophic nitrogen removal section (C) is totally gathered into a main pipe row.
In the denitrification and dephosphorization of sewage, most of the sewage enters a single dephosphorization system through a direct anaerobic mode, so that the chemical oxygen demand is not easy to reduce, and the denitrification and dephosphorization efficiency is low, so that a sewage deep denitrification and dephosphorization treatment process is needed to solve the problems.
Disclosure of Invention
The invention aims to provide a sewage deep denitrification and dephosphorization treatment process, which aims to solve the defects in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
a sewage deep denitrification and dephosphorization treatment process comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: and (3) pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimented sewage into a fine filtering device, discharging after fine filtering, separating the sedimented sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank.
As a preferred embodiment of the invention, a filter screen and filter screen cleaning equipment are arranged in the filter tank in the step S1, and the mesh size of the filter screen is 8 x 12mm.
In the preferred embodiment of the present invention, in the step S2, an auxiliary agent such as a sewage flocculant (polyaluminum chloride, polyaluminum sulfate or polyacrylamide), a coagulant aid, a dechlorinating agent, etc. is added to the filtering tank.
As a preferable embodiment of the invention, stirring equipment is arranged in the filter tank, the pre-denitration tank, the anaerobic tank, the anoxic tank and the aerobic tank.
As a preferred embodiment of the invention, a sludge separation device is arranged in the sedimentation tank, one part of sludge is pumped back into the denitrification tank, and the other part of sludge is pumped into the sludge tank.
As a preferable embodiment of the invention, the sewage is aerated in the aerobic tank during the reaction of the aerobic tank, and the air inlet end of the aeration pipe is provided with an electromagnetic valve.
As a preferred embodiment of the invention, a filler layer, a filter layer and an active carbon layer are arranged in the fine filtering equipment.
As a preferred embodiment of the present invention, the filler in the filler layer is a sponge.
As a preferred embodiment of the invention, the filter layer can be one of a fine filter screen or a fine filter mode of a fine filter element.
As a preferred embodiment of the invention, the sterilizing structure is arranged in the fine filtering equipment, and the sterilizing structure can be a sterilizing mode such as an ultraviolet radiation sterilizing lamp, a sterilizing agent adding mode and the like.
In the technical scheme, the sewage deep denitrification and dephosphorization treatment process provided by the invention has the beneficial effects that: (1) The filter tank and the pre-denitrification tank are additionally arranged in front of the anaerobic tank, suspended matters in sewage can be filtered by the filter tank, the pre-denitrification tank can enable nitrate nitrogen in sludge flowing back from the sedimentation tank to perform denitrification reaction with the sewage, then the flowing back sludge enters the anaerobic tank again to perform biological dephosphorization reaction with the sewage, so that interference of nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the denitrification and dephosphorization efficiency is improved; (2) The interior of the filtering tank for refluxing the supernatant enters a treatment system along with sewage, and the supernatant contains a large amount of small molecular organic matters at the stage, so that the biodegradability is improved, and the organic load of a biochemical aerobic tank is effectively reduced; (3) The method realizes the reduction of chemical oxygen demand, total phosphorus and total nitrogen in the alternate operation of anaerobic-anoxic-aerobic, and then the sewage is introduced into a rear anoxic tank to further strengthen the removal of nitrogen; and the sewage is further subjected to the post-aerobic tank to strengthen the removal of phosphorus, so that the sewage can be deeply denitrified and dephosphorized, and the decarburization and dephosphorization effects are better.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic flow chart of a sewage deep denitrification and dephosphorization treatment process according to an embodiment of the invention.
FIG. 2 is a schematic diagram of total nitrogen data provided by an embodiment of a process for deep denitrification and dephosphorization of wastewater according to the present invention.
FIG. 3 is a schematic diagram of total phosphorus data provided by an embodiment of a process for deep denitrification and dephosphorization of wastewater according to the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, the sewage deep denitrification and dephosphorization treatment process provided by the embodiment of the invention comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: and (3) pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimented sewage into a fine filtering device, discharging after fine filtering, separating the sedimented sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank.
In particular, in the embodiment, the sewage deep denitrification and dephosphorization treatment process comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimentated sewage into a fine filtering device, discharging after fine filtering, separating the sedimentated sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank; by additionally arranging the pre-denitrification tank in front of the anaerobic tank, nitrate nitrogen in sludge flowing back from the sedimentation tank and sewage are subjected to denitrification reaction, then the flowing back sludge enters the anaerobic tank again to be subjected to biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the efficiency of denitrification and dephosphorization is improved.
The sewage deep denitrification and dephosphorization treatment process provided by the invention has the beneficial effects that: by additionally arranging the pre-denitrification tank in front of the anaerobic tank, nitrate nitrogen in sludge flowing back from the sedimentation tank and sewage are subjected to denitrification reaction, then the flowing back sludge enters the anaerobic tank again to be subjected to biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the efficiency of denitrification and dephosphorization is improved.
As the preferred embodiment of the invention, a filter screen and filter screen cleaning equipment are arranged in the filter tank in the S1, the meshes of the filter screen are 8 x 12mm, and the filter screen equipment can clean the filter screen so as not to influence impurities to block the filter screen.
As a preferred embodiment of the invention, in S2, sewage flocculating agent (polyaluminium chloride, polyaluminium sulfate or polyacrylamide), coagulant aid, dechlorinating agent and other auxiliary agents are added into the filter tank, and the flocculating agent can coagulate suspended matters in sewage together, so that the suspended matters can be filtered conveniently.
As a preferred embodiment of the invention, stirring equipment is arranged in the filter tank, the pre-denitrification tank, the anaerobic tank, the anoxic tank and the aerobic tank, and the stirring equipment can stir sewage to enable the sewage to react rapidly.
As a preferred embodiment of the invention, a sludge separation device is arranged in the sedimentation tank, one part of sludge is pumped back into the denitrification tank, the other part of sludge is pumped into the sludge tank, and the sludge separation device can separate the sludge.
As the preferable embodiment of the invention, the sewage is aerated in the aerobic tank during the reaction of the aerobic tank, and the electromagnetic valve is arranged at the air inlet end of the aeration pipe, so that the oxygen in the aerobic tank can be ensured to be sufficient.
As a preferred embodiment of the invention, the fine filtering equipment is internally provided with a packing layer, a filter layer and an active carbon layer, wherein the packing layer and the filter layer are used for fine filtering sewage, and the active carbon can adsorb harmful substances in the sewage.
As a preferred embodiment of the present invention, the filler in the filler layer is a sponge.
As a preferred embodiment of the invention, the filter layer can be one of a fine filter screen or a fine filter mode of a fine filter element, so that the sewage can be subjected to fine filtration, and the discharged water is cleaner.
As a preferred embodiment of the invention, the fine filtering equipment is internally provided with a disinfection structure, which can be a disinfection mode such as ultraviolet radiation disinfection lamp, disinfectant addition and the like, and can disinfect water after denitrification and dephosphorization.
Example 1
A sewage deep denitrification and dephosphorization treatment process comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimentated sewage into a fine filtering device, discharging after fine filtering, separating the sedimentated sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank; by additionally arranging the pre-denitrification tank in front of the anaerobic tank, nitrate nitrogen in sludge flowing back from the sedimentation tank and sewage are subjected to denitrification reaction, then the flowing back sludge enters the anaerobic tank again to be subjected to biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the efficiency of denitrification and dephosphorization is improved.
As the preferred embodiment of the invention, a filter screen and filter screen cleaning equipment are arranged in the filter tank in S1, the mesh size of the filter screen is 8 mm or 12mm, the filter screen equipment can clean the filter screen so as not to influence impurities to block the filter screen, and in S2, assistants such as sewage flocculant, coagulant aid, dechlorinating agent and the like are added into the filter tank, and the flocculant can enable suspended matters in sewage to be coagulated together, so that suspended matters can be filtered conveniently.
As a preferred embodiment of the invention, stirring equipment is arranged in the filter tank, the pre-denitrification tank, the anaerobic tank, the anoxic tank and the aerobic tank, and the stirring equipment can stir sewage to enable the sewage to react rapidly.
As a preferred embodiment of the invention, a sludge separation device is arranged in the sedimentation tank, one part of sludge is pumped back into the denitrification tank, the other part of sludge is pumped into the sludge tank, and the sludge separation device can separate the sludge.
As the preferable embodiment of the invention, the sewage is aerated in the aerobic tank during the reaction of the aerobic tank, and the electromagnetic valve is arranged at the air inlet end of the aeration pipe, so that the oxygen in the aerobic tank can be ensured to be sufficient.
As a preferred embodiment of the invention, the fine filtering equipment is internally provided with the packing layer, the filter layer and the active carbon layer, the packing layer and the filter layer are used for fine filtering sewage, the active carbon can adsorb harmful substances in the sewage, the packing in the packing layer is a sponge, the filter layer is a fine filter screen, the sewage can be fine filtered, the discharged water is cleaner, the fine filtering equipment is internally provided with a disinfection structure, and the disinfection structure is an ultraviolet radiation disinfection lamp, so that the water after denitrification and dephosphorization can be disinfected, and the harmful substances in the water can be killed.
Example two
A sewage deep denitrification and dephosphorization treatment process comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimentated sewage into a fine filtering device, discharging after fine filtering, separating the sedimentated sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank; by additionally arranging the pre-denitrification tank in front of the anaerobic tank, nitrate nitrogen in sludge flowing back from the sedimentation tank and sewage are subjected to denitrification reaction, then the flowing back sludge enters the anaerobic tank again to be subjected to biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the efficiency of denitrification and dephosphorization is improved.
As the preferred embodiment of the invention, a filter screen and filter screen cleaning equipment are arranged in the filter tank in S1, the mesh size of the filter screen is 8 x 12mm, the filter screen equipment can clean the filter screen so as not to influence impurities to block the filter screen, and a sewage flocculating agent polyacrylamide and a coagulant aid are added into the filter tank in S2, so that suspended matters in sewage can be coagulated together by the flocculating agent and the coagulant aid, and the suspended matters can be filtered conveniently.
As a preferred embodiment of the invention, stirring equipment is arranged in the filter tank, the pre-denitrification tank, the anaerobic tank, the anoxic tank and the aerobic tank, and the stirring equipment can stir sewage to enable the sewage to react rapidly.
As a preferred embodiment of the invention, a sludge separation device is arranged in the sedimentation tank, one part of sludge is pumped back into the denitrification tank, the other part of sludge is pumped into the sludge tank, and the sludge separation device can separate the sludge.
As the preferable embodiment of the invention, the sewage is aerated in the aerobic tank during the reaction of the aerobic tank, and the electromagnetic valve is arranged at the air inlet end of the aeration pipe, so that the oxygen in the aerobic tank can be ensured to be sufficient.
As the preferred embodiment of the invention, the fine filtering equipment is internally provided with the packing layer, the filter layer and the active carbon layer, the packing layer and the filter layer are used for fine filtering sewage, the active carbon can adsorb harmful substances in the sewage, the packing in the packing layer is sponge, the fine filtering equipment is internally provided with the disinfection structure, and disinfectant is added into water to mix the water with the disinfectant, so that the water after denitrification and dephosphorization can be disinfected.
As a preferred embodiment of the invention, the filter layer is a fine filter element, so that the sewage can be subjected to fine filtration, and impurities in the water can be thoroughly removed.
Example III
A sewage deep denitrification and dephosphorization treatment process comprises the following steps,
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimentated sewage into a fine filtering device, discharging after fine filtering, separating the sedimentated sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank; by additionally arranging the pre-denitrification tank in front of the anaerobic tank, nitrate nitrogen in sludge flowing back from the sedimentation tank and sewage are subjected to denitrification reaction, then the flowing back sludge enters the anaerobic tank again to be subjected to biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, and the efficiency of denitrification and dephosphorization is improved.
As the preferable embodiment of the invention, stirring equipment is arranged in the filter tank, the pre-denitrification tank, the anaerobic tank, the anoxic tank and the aerobic tank, the stirring equipment can stir sewage to enable the sewage to rapidly react, the sewage is used for aerating the interior of the aerobic tank during the reaction of the aerobic tank, the electromagnetic valve is arranged at the air inlet end of the aeration pipe to ensure sufficient oxygen in the aerobic tank, the sludge separation equipment is arranged in the sedimentation tank to suck one part of sludge back into the denitrification tank, the other part of sludge is sucked into the sludge tank, and the sludge separation equipment can separate the sludge.
As the preferred embodiment of the invention, a filter screen and filter screen cleaning equipment are arranged in the filter tank in S1, the mesh size of the filter screen is 8 x 12mm, the filter screen equipment can clean the filter screen so as not to influence impurities to block the filter screen, and a sewage flocculating agent polyacrylamide and a coagulant aid are added into the filter tank in S2, so that suspended matters in sewage can be coagulated together by the flocculating agent and the coagulant aid, and the suspended matters can be filtered conveniently.
As the preferred embodiment of the invention, the fine filtering equipment is internally provided with the packing layer, the filter layer and the active carbon layer, the packing layer and the filter layer are used for fine filtering sewage, the active carbon can adsorb harmful substances in the sewage, the packing in the packing layer is sponge, the fine filtering equipment is internally provided with the disinfection structure, disinfectant is added into the water, so that the water is mixed with the disinfectant, the water after denitrification and dephosphorization can be disinfected, the filter layer is a fine filtering filter element, the sewage can be fine filtered, and impurities in the water can be thoroughly removed.
After the system stably operates, water quality detection data recorded for 7 days show that the denitrification and dephosphorization process flow of sewage treatment shows high-efficiency removal of total nitrogen and total phosphorus, the total nitrogen concentration of the effluent is stabilized below 5mg/L, the total phosphorus concentration of the effluent is kept at a lower level of 0.1mg/L, the total phosphorus of the effluent is realized to be lower than 0.2mg/L for a plurality of times, and the total nitrogen and phosphorus removal rate is as high as 95%.
Working principle: the sewage deep denitrification and dephosphorization treatment process comprises the following steps of adding a flocculating agent into a filter tank, gathering suspended garbage, filtering the suspended garbage in the sewage, introducing flocculated sludge in the filter tank into a hydrolytic acidification tank, obtaining supernatant after hydrolytic acidification, refluxing the supernatant into the filter tank, introducing the interior of the filter tank with the sewage into a treatment system, wherein the supernatant contains a large amount of micromolecular organic matters, improving biodegradability and effectively reducing the organic load of a biochemical aerobic tank, introducing the sewage after filtering garbage into a pre-denitrification tank, carrying out denitrification reaction on nitrate nitrogen in sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage, reducing the nitrate nitrogen into nitrogen gas for denitrification, adding the filter tank and a pre-denitrification tank in front of the anaerobic tank, the filter tank can filter suspended matters in sewage, the pre-denitrification tank can enable nitrate nitrogen in sludge flowing back from the sedimentation tank to perform denitrification reaction with the sewage, then the flowing back sludge enters the anaerobic tank to perform biological dephosphorization reaction with the sewage, so that interference of the nitrate nitrogen in the flowing back sludge on dephosphorization is avoided, chemical oxygen demand of the sewage is reduced, denitrification and dephosphorization efficiency is improved, the denitrified sludge mixed liquor is pumped into the anaerobic tank to perform biological dephosphorization reaction under the anaerobic condition, the sludge mixed liquor after dephosphorization in the anaerobic tank is pumped into the anoxic tank to perform denitrification reaction with nitrifying liquor flowing back from the aerobic zone into the anoxic tank, the sludge mixed liquor is pumped into the aerobic tank to perform nitrification reaction after denitrification in the anoxic tank, a part of nitrifying liquor flows back from the aerobic tank to the anoxic tank for use, the method comprises the steps of sequentially pumping sludge mixed liquor in an aerobic tank into a rear anoxic tank and a rear aerobic tank for denitrification and nitration reaction, pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimentated sewage into a fine filtration device, discharging the sewage after fine filtration, arranging an ultraviolet disinfection device in the fine filtration device for disinfecting the sewage, enabling the discharged sewage to be cleaner, separating the sedimentated sludge by a sludge separation device, refluxing a part of sludge into a pre-stripping tank for use, pumping a part of sludge into the sludge tank, and further enhancing the removal of nitrogen by introducing the sewage into the rear anoxic tank through the alternate operation of anaerobic-anoxic-aerobic-anoxic-aerobic, and further enhancing the removal of phosphorus by the rear aerobic tank, so that the sewage can be deeply denitrified and dephosphorized, and the dephosphorizing effect is better.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The sewage deep denitrification and dephosphorization treatment process comprises the following steps of:
s1: and (3) a filtering tank: firstly, filtering suspended garbage in sewage;
s2: introducing flocculated sludge in the filter tank into a hydrolysis acidification tank, and obtaining supernatant after hydrolysis acidification, wherein the supernatant flows back into the filter tank;
s3: pretreatment: the sewage after the garbage is filtered enters a pre-denitrification tank, and nitrate nitrogen in the sludge in a sedimentation tank which flows back from a sludge separation device and organic matters in the sewage are subjected to denitrification reaction, so that the nitrate nitrogen can be reduced into nitrogen for denitrification;
s4: pumping the denitrified sludge mixed liquor into an anaerobic tank, and performing biological dephosphorization reaction under anaerobic conditions;
s5: pumping the sludge mixed liquor after dephosphorization in the anaerobic tank into the anoxic tank, and carrying out denitrification reaction with nitrifying liquor which flows back into the anoxic tank from the aerobic zone;
s6: after denitrification is carried out on the sludge mixed solution in the anoxic tank, the sludge mixed solution is pumped into the aerobic tank for nitration reaction, and a part of the nitrified solution flows back to the anoxic tank from the aerobic tank for use;
s7: pumping the sludge mixed liquor in the aerobic tank into a post anoxic tank and a post aerobic tank in sequence to perform denitrification and nitration reaction again;
s8: and (3) pumping the sludge mixed liquor in the rear aerobic tank into a sedimentation tank for sedimentation, pumping the sedimented sewage into a fine filtering device, discharging after fine filtering, separating the sedimented sludge by a sludge separating device, refluxing a part of sludge into a pre-denitration tank for use, and pumping a part of sludge into the sludge tank.
2. The process for deep denitrification and dephosphorization treatment of sewage according to claim 1, wherein a filter screen and filter screen cleaning equipment are arranged in the filter tank in the step S1, and meshes of the filter screen are 8 x 12mm.
3. The process for advanced nitrogen and phosphorus removal of sewage according to claim 1, wherein in the step S2, an auxiliary agent such as a sewage flocculant (polyaluminum chloride, polyaluminum sulfate or polyacrylamide), a coagulant aid, a dechlorinating agent and the like is added into the filtering tank.
4. The process for deeply denitrifying and dephosphorizing sewage according to claim 1, wherein stirring equipment is arranged in each of the filter tank, the pre-denitrification tank, the anaerobic tank, the anoxic tank and the aerobic tank.
5. The process for deep denitrification and dephosphorization treatment of sewage according to claim 1, wherein a sludge separation device is arranged in the sedimentation tank, one part of sludge is pumped back into the denitrification tank, and the other part of sludge is pumped into the sludge tank.
6. The process for deep denitrification and dephosphorization of sewage according to claim 1, wherein the sewage is aerated in the aerobic tank during the reaction of the aerobic tank, and the air inlet end of the aeration pipe is provided with an electromagnetic valve.
7. The advanced nitrogen and phosphorus removal treatment process for sewage according to claim 1, wherein a filler layer, a filter layer and an active carbon layer are arranged in the fine filtering equipment.
8. The process for deep denitrification and dephosphorization treatment of sewage according to claim 1, wherein the filler in the filler layer is a sponge.
9. The process for deep denitrification and dephosphorization treatment of sewage according to claim 1, wherein the filter layer can be one of a fine filter screen or a fine filter element.
10. The advanced nitrogen and phosphorus removal treatment process for sewage according to claim 1, wherein the fine filtration equipment is internally provided with a disinfection structure which can be a disinfection mode such as an ultraviolet radiation disinfection lamp, a disinfectant adding mode and the like.
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