CN113003881B - Sewage treatment process - Google Patents
Sewage treatment process Download PDFInfo
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- CN113003881B CN113003881B CN202110270559.6A CN202110270559A CN113003881B CN 113003881 B CN113003881 B CN 113003881B CN 202110270559 A CN202110270559 A CN 202110270559A CN 113003881 B CN113003881 B CN 113003881B
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- 239000010865 sewage Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 154
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 81
- 239000011574 phosphorus Substances 0.000 claims abstract description 81
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000003068 static effect Effects 0.000 claims abstract description 22
- 239000006004 Quartz sand Substances 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- 230000016615 flocculation Effects 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims abstract description 10
- 230000008030 elimination Effects 0.000 claims abstract description 5
- 238000003379 elimination reaction Methods 0.000 claims abstract description 5
- 239000010802 sludge Substances 0.000 claims description 60
- 238000004062 sedimentation Methods 0.000 claims description 34
- 238000005192 partition Methods 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 25
- 238000011001 backwashing Methods 0.000 claims description 17
- 238000005276 aerator Methods 0.000 claims description 13
- 239000000969 carrier Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 230000001546 nitrifying effect Effects 0.000 claims description 11
- 239000006228 supernatant Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 4
- 238000005243 fluidization Methods 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims 3
- 206010021143 Hypoxia Diseases 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 claims 1
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 abstract 1
- 230000014759 maintenance of location Effects 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000003814 drug Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000006213 oxygenation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 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
- 239000004480 active ingredient Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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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
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- 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
- C02F3/308—Biological phosphorus removal
-
- 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
Abstract
The invention relates to the technical field of MBBR sewage treatment, and discloses a sewage treatment process which comprises an anaerobic phosphorus release zone, a static settling zone, a phosphorus removal flocculation reaction zone, a phosphorus removal settling zone, a denitrification phosphorus removal anoxic zone, a denitrification nitrogen removal anoxic zone, a phosphorus absorption nitrification aerobic zone, a primary settling zone, a nitrification aerobic carrier zone, a denitrification oxygen elimination carrier zone, a secondary settling zone, a quartz sand filtering zone, a water outlet zone and a disinfection zone which are sequentially connected from front to back.
Description
Technical Field
The invention relates to the technical field of MBBR sewage treatment, in particular to a sewage treatment process.
Background
With the improvement of the national discharge standard of sewage treatment plants, the upgrading and reconstruction of the existing sewage treatment plants are urgent, the problem commonly encountered in upgrading and reconstruction is the standard reaching of total nitrogen, and meanwhile, under the condition that the total nitrogen reaches the standard, how to realize the synchronous standard reaching of other indexes in the most economic way is realized, the conventional denitrification and dephosphorization process of the sewage treatment plants cannot meet the current water quality requirement easily, and the traditional secondary treatment process flow of the sewage treatment plants has low volume load and large occupied area.
A certain amount of suspension carriers are added into a Reactor by using an MBBR (Moving Bed Biofilm Reactor) process to serve as carriers for attachment growth of microorganisms, and the Biofilm on the carriers is not limited by the engineering sludge age of sludge discharge, so that more sludge-age floras, particularly nitrifying bacteria, can be enriched, a high-efficiency ammonia nitrogen nitrification effect is obtained, the load is high, and the ammonia nitrogen concentration of effluent is low. The MBBR also has the advantages of land occupation saving, low capital construction cost, flexible and simple transformation and construction and the like, the new upgrading transformation at present mainly focuses on phosphorus and nitrogen removal, the biological phosphorus and nitrogen removal is an economic mode, COD which needs to be removed originally becomes a valuable carbon source for phosphorus and nitrogen removal, and most municipal sewage plants add additional carbon sources for phosphorus and nitrogen removal, so that the treatment cost is greatly increased.
Disclosure of Invention
The invention aims to provide a sewage treatment process to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a sewage treatment process comprises an anaerobic phosphorus release zone, a static sedimentation zone, a phosphorus removal flocculation reaction zone, a phosphorus removal sedimentation zone, a denitrification phosphorus removal anoxic zone, a denitrification nitrogen removal anoxic zone, a phosphorus absorption nitrification aerobic zone, a primary sedimentation zone, a nitrification aerobic carrier zone, a denitrification oxygen removal carrier zone, a secondary sedimentation zone, a quartz sand filtering zone, a water outlet zone and a disinfection zone which are sequentially connected from front to back, and comprises the following steps:
s1: the sewage to be treated enters a channel at the bottom of the suspended partition wall from a water inlet pipe and flows out, one of the residual sludge return pipes discharged from the primary sedimentation tank is connected into the anaerobic phosphorus release area and is stirred by a submersible stirrer to be fully mixed with the inlet water, and the carbon source in the raw water is utilized to fully release phosphorus.
S2: the sewage to be treated is discharged from the upper part water outlet pipe when the supernatant with high concentration of phosphorus is statically precipitated in the region, and the sludge mixed liquid rich in phosphorus-accumulating bacteria at the lower part of the static precipitation region is discharged from the bottom water outlet pipe.
S3: the upper water inlet pipe is connected with a water outlet pipe of the dephosphorization sedimentation zone, the lower water inlet pipe is connected with a water outlet pipe of the sludge-water mixed liquor at the lower part of the static sedimentation zone, the nitrified liquid reflux water inlet pipe is connected with a denitrification reflux pipe of the denitrification oxygen-eliminating carrier zone, and a submersible stirrer is arranged in the denitrification dephosphorization zone to fully mix the sludge and water in the zone.
S4: the water inlet of the partition wall is connected with the water outlet of the partition wall in the denitrification dephosphorization zone, the mixed liquid inlet pipe is connected with the mixed liquid outlet pipe at the lower part of the static sedimentation zone, and the denitrification anoxic zone is provided with a submersible stirrer and an aerator to fully mix the muddy water in the zone and supplement dissolved oxygen in a proper amount.
S5: the water inlet of the partition wall is connected with the water outlet of the partition wall in the denitrification and anoxic zone, and an aerator is arranged in the zone to aerate and oxygenate the sludge-water mixed liquid.
S6: the water inlet pipe is connected with the water outlet pipe of the phosphorus absorption and nitrification aerobic area, the first sludge discharge pipe conveys return sludge to the anaerobic phosphorus release area, and the second sludge discharge pipe conveys residual sludge to the sludge storage area.
S7: the water inlet pipe is connected with the water outlet pipe of the primary sedimentation area, PPC high-efficiency biological carriers are added into the area, 15-40% of the sewage treatment process is added into the area, a perforated plate or a T-shaped wire screen pipe interception net is arranged at the outlet of the partition wall to prevent the carriers from flowing out of the area along with water flow, and an aerator three-way tank water is arranged in the area to oxygenate and provide power for carrier fluidization.
S8: the water inlet of the partition wall is connected with the partition wall outlet of the nitrification aerobic carrier area, the PPC high-efficiency biological carriers are added into the area, 15-40% of the sewage treatment process tank is used for containing a sewage treatment process, a perforated plate or a T-shaped silk screen pipe intercepting net is arranged at the water outlet pipe to prevent the carriers from flowing out of the area along with water flow, a submersible stirrer is arranged in the area to provide power for carrier fluidization, and a water outlet pipe conveys nitrification liquid to a denitrification nitrogen and oxygen lack area.
S9: sludge discharged by a sludge discharge pipe is connected into a sludge storage area, at least 3 groups of quartz sand filtering areas are arranged, regular back washing is alternately carried out, and back washing is carried out through combination of air washing, air water washing and water washing; and the backwashing water flows back to the denitrification dephosphorization anoxic zone through the nitrifying liquid return pipe and is treated again.
S10: the water outlet area and the disinfection area are connected with a water inlet channel and a water outlet channel, an ultraviolet disinfection lamp is arranged in the water outlet channel, the water inlet channel is connected with a water outlet pipe of the quartz sand filtering area, qualified treated water is discharged from the water outlet channel, and a backwashing water pump is arranged in the water outlet area to perform backwashing on the quartz sand filtering pool.
Preferably, one side of the anaerobic phosphorus release area is connected with a water inlet pipe, one end of the water inlet pipe is installed on one side of the water outlet suspension partition wall, the water outlet suspension partition wall is connected on one side of the static settlement area, and the top of the static settlement area is provided with a mud-water mixture outlet pipe at the bottom of the supernatant outlet pipe.
Preferably, the dephosphorization flocculation reaction zone is connected with a water inlet pipe and a first dosing pipe and is provided with a long shaft stirrer, the bottom of the long shaft stirrer is connected with a water outlet pipe, and the water inlet pipe is connected with a supernatant water outlet pipe on the upper part of the static settling zone.
Preferably, the dephosphorization sedimentation zone is connected with inlet tube, outlet pipe, and the bottom is equipped with the sludge discharge pipe, and the inlet tube inserts by dephosphorization flocculation reaction zone outlet pipe, and the sludge discharge pipe sludge discharge of bottom inserts the mud storage area, denitrification nitrogen removal anoxic zone is connected with partition wall water inlet, partition wall delivery port and mixes liquid inlet tube.
Preferably, the phosphorus and nitrification aerobic zone is connected with a partition water inlet, a water outlet pipe and a first aeration air inlet pipe, and the primary sedimentation zone is connected with a water inlet pipe, a water outlet pipe, a first sludge discharge pipe and a second sludge discharge pipe. The water inlet pipe is connected with a water outlet pipe of the phosphorus and nitrification aerobic zone, and the nitrification aerobic carrier zone is connected with a water inlet pipe, a partition wall water outlet pipe and an aeration air inlet pipe II.
Preferably, the denitrification oxygen-eliminating carrier area is connected with a partition wall water inlet, a first water outlet pipe and a second water outlet pipe, the secondary sedimentation area is connected with a water inlet pipe, a water outlet pipe and a sludge discharge pipe, the quartz sand filtering area is provided with at least 3 groups, and the water outlet area and the disinfection area are connected with a water inlet channel and a water outlet channel which are internally provided with ultraviolet disinfection lamps.
Compared with the prior art, the invention provides a sewage treatment process, which has the following beneficial effects:
the effluent sewage treatment process with low and high operating cost is characterized in that phosphorus removal and nitrification are separately treated, denitrification and phosphorus removal are combined, the total phosphorus and total nitrogen stably reach the standard by the treatment process of combining biological phosphorus removal and chemical phosphorus removal, a carbon source in raw water is fully utilized for phosphorus and nitrogen removal to reduce the operating cost, phosphorus and nitrogen removal is organically combined by denitrifying phosphorus-accumulating bacteria DPB, phosphorus and nitrification are effectively separated by an MBBR technology, and phosphorus-accumulating bacteria and nitrifying bacteria with different ages of mud can be respectively arranged in the sewage treatment process to exert respective efficacies.
The low-operating-cost high-standard effluent sewage treatment process fully utilizes a carbon source in raw water by adopting multi-point water inflow, nitrification liquid oxygen elimination backflow, denitrification dephosphorization and denitrifying bacteria endogenous respiration denitrification technologies, and simultaneously submerges internal resources to achieve the purpose of saving the carbon source.
According to the effluent sewage treatment process with low operation cost and high standard, a chemical phosphorus removal agent is added by adopting partial anaerobic phosphorus release liquid, so that the condition that the subsequent aerobic phosphorus absorption is not influenced by excessive addition of the phosphorus removal agent is ensured, meanwhile, the use amount of the chemical phosphorus removal agent is reduced, the total phosphorus is ensured to be stable and reach the standard, partial anaerobic phosphorus release liquid is subjected to phosphorus removal by the chemical phosphorus removal agent by utilizing a side flow technology, the subsequent phosphorus removal load is reduced, and the use amount of the chemical agent is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: c1, an anaerobic phosphorus release area; c2, a static settling zone; c3, a dephosphorization flocculation reaction zone; c4, a dephosphorization settling zone; c5, a denitrification dephosphorization anoxic zone; c6, a denitrification anoxic zone; c7, phosphorus and nitrification aerobic zone absorption; c8, a primary precipitation zone; c9, nitrifying the aerobic carrier zone; c10, a denitrification oxygen-eliminating carrier region; c11, a secondary sedimentation area; c12, a quartz sand filtering area; c13, a water outlet area; c14, a disinfection area; c15, a sludge storage area;
s1, an anaerobic phosphorus release area stirrer; s2, a dephosphorizing flocculation reaction zone stirrer; s3, a denitrification dephosphorization anoxic zone stirrer; s4, a denitrification anoxic zone stirrer; s5, a denitrification anoxic zone aerator; s6, a phosphorus and nitrate absorption aerobic zone aerator; s7, a fan; s8, nitrifying an aerobic carrier zone aerator; s9, nitrifying an aerobic carrier zone carrier; s10, a nitrifying aerobic carrier area intercepting net; s11, a denitrification oxygen-eliminating carrier zone stirrer; s12, denitrifying oxygen-eliminating carrier zone carriers; s13, a denitrification oxygen-eliminating carrier area interception net; s14, backwashing an aerator; s15, backwashing the water distribution pipe; s16, backwashing a water pump; s17, a supporting layer; s18, filtering with quartz sand; s19, a dehydrator; s19, ultraviolet illumination equipment;
p1, a water inlet pipe; p2, a supernatant outlet pipe of the static settling area; p3, a dosing pipe of the dephosphorization flocculation reaction zone; p4, a water outlet pipe of the dephosphorization flocculation reaction zone; p5, a water outlet pipe for the muddy water mixed liquid in the static settling area; p6, a water outlet pipe of the dephosphorization precipitation zone; p7, a sludge discharge pipe of a dephosphorization precipitation zone; p8, a multi-point water inlet pipe of a denitrification anoxic zone; p9, a phosphorus and nitrification aerobic zone air inlet pipe is sucked; p10, discharging a water pipe of the phosphorus and nitrification aerobic zone; p11, discharging a water pipe in the primary sedimentation area; p12, a denitrification anoxic zone air inlet pipe; p13, a nitrifying aerobic carrier zone air inlet pipe; p14, a sludge discharge pipe in the primary sedimentation area; p15, a digestive juice reflux pipe; p16, a water outlet pipe of the denitrification oxygen-eliminating carrier area; p17, a secondary sedimentation area sludge discharge pipe; p18, a chemical feeding pipe in a quartz sand filtering area; p19, a water outlet pipe of the secondary sedimentation area; p20, a water outlet pipe; p21, backwashing a drain pipe in the quartz sand filtering area; p22, a sludge inlet pipe of the sludge storage area; p23, a sludge outlet pipe of the sludge storage area; p24, a sludge return pipe; p25, a supernatant outlet pipe of the dehydrator; p26, transporting the dewatered sludge outside.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in a sewage treatment process, the hydraulic retention time of an anaerobic phosphorus release zone is 1 hour, 50-80% of sludge reflux is mixed with sludge and water by using a submersible stirrer, 30-50% of anaerobic phosphorus release supernatant flows to a phosphorus removal flocculation reaction zone and a phosphorus removal sedimentation zone through a side flow, the hydraulic retention time of the flocculation reaction zone is 30 minutes, the hydraulic retention time of the sedimentation zone is 2 hours, and the dosage of a phosphorus removal medicament is calculated according to the following formula:
wherein: n is a radical of Phosphorus removal medicament -the molar equivalents of effective phosphorus removal agent to phosphorus removed;
M phosphorus removal medicament The molar weight of the effective components of the added phosphorus removal medicament, mol/L;
M non-biosynthesized phosphorus-like material -means total molar removal of phosphorus other than biosynthesis, mol/L;
C phosphorus removal medicament The mass concentration of the added phosphorus removal agent is mg/L;
k 1 ,k 2 al in phosphorus removal agent 2 O 3 And the mass content of the Fe active ingredient;
0.0196,0.0178-each stands for 1mg Al 2 O 3 And the molar ratio mol/mg of Al and Fe in Fe.
GB/T22627-2008: liquid and solid polyaluminum chlorides of Al 2 O 3 Respectively calculated according to 6 percent and 28 to 30 percent
GB 14591-2006: the Fe content of the polymeric ferric sulfate is 18.5 percent
HG 2227-2004: the content of the liquid and solid polyaluminium sulfates is respectively 7.8% and 15.6%
The hydraulic retention time of the denitrification dephosphorization zone is 2 hours, the sludge concentration is controlled to be 2500-3000 mg/L, the dissolved oxygen is controlled to be 0.5-1.0 mg/L, and the sludge age is 5-7 days. The submerged stirrer is arranged in the area to stir and mix the muddy water mixed liquor from the anaerobic phosphorus release area, raw water entering from multiple points and 100 to 150 percent of nitrified liquor flowing back from the denitrification oxygen elimination area.
The hydraulic retention time of the denitrification anoxic zone is 2 hours, the sludge concentration is controlled to be 2500-3000 mg/L, the dissolved oxygen is controlled to be 0.5-1.0 mg/L, and the sludge age is 5-7 days. A submersible stirrer and an aerator are arranged in the region to stir and mix the sewage from the denitrification dephosphorization region and raw water entering from multiple points.
The hydraulic retention time of the phosphorus absorption and nitrification aerobic zone is 3 hours, the sludge concentration is controlled to be 2500-3000 mg/L, the dissolved oxygen is controlled to be 2.0-3.0 mg/L, and the sludge age is 5-7 days. The area is internally provided with an aerator which is used for carrying out oxygenation stirring on the mixed liquid from the denitrification and denitrification anoxic area to further finish the aerobic phosphorus absorption process.
The hydraulic retention time of the primary settling zone is 2.5 hours, and the hydraulic surface load is 1.0m 3 /m 2 And h, about, one part of the discharged sludge is delivered to an anaerobic phosphorus release area through a sludge discharge pipe I, and the rest sludge is delivered to a sludge storage area through a sludge discharge pipe II.
The hydraulic retention time of a nitrification aerobic carrier area is 3 hours, 15-20% of efficient biological carriers PPC are added, a sewage treatment process area pool containing a sewage treatment process is adopted, an interception net is arranged at a water outlet, the sewage treatment process area pool containing an air blowing device is adopted, the DO value in the area is controlled to be 3-4 mg/L, and three aerators are arranged for carrying out oxygenation and nitrification on the sewage from a primary sedimentation area.
The hydraulic retention time of a denitrification oxygen-eliminating carrier area is 0.5 hour, 15-20% of efficient biological carrier PPC is added, a sewage treatment process is carried out in a sewage treatment process area, an interception net is arranged at a water outlet, a sewage treatment process with an air blowing device is carried out in the sewage treatment process, a submersible stirrer is arranged in the area to stir sewage from a nitrification aerobic carrier area for oxygen elimination and denitrification, and the DO value at the outlet is controlled to be less than 1mg/L. 100-150% of nitrified liquid is returned to the denitrification dephosphorization zone through the first discharge pipe, and the rest is sent to the secondary sedimentation zone through the second discharge pipe.
The hydraulic retention time of the secondary sedimentation zone is 2.5 hours, and the hydraulic surface load is 1.0m 3 /m 2 About h, discharging sludge and conveying the discharged sludge to a sludge storage area through a sludge discharge pipe, arranging at least 3 groups of quartz sand filter tanks, alternately performing regular backwashing, performing backwashing by combining gas washing, gas washing and water washing, and returning backwashing water to a denitrification dephosphorization area through a backwashing discharge pipe through a nitration liquid return pipe for secondary treatment;
adding carbon source into the quartz sand filter according to 3 times of TN concentration difference value of inlet water and outlet water of the filter and BOD equivalent until TN of outlet water of the filter area reaches the standard, and keeping the adding amount of the carbon source unchanged; when the COD of the effluent of the denitrification filter tank area is more than 30mg/L, the adding amount of the carbon source is reduced by 10 percent until the COD of the effluent of the denitrification filter tank area is less than or equal to 30mg/L, the adding amount of the carbon source is kept unchanged, and the sewage reaching the standard is discharged after the outlet of the filter tank is subjected to ultraviolet disinfection.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A sewage treatment process comprises an anaerobic phosphorus release zone, a static sedimentation zone, a phosphorus removal flocculation reaction zone, a phosphorus removal sedimentation zone, a denitrification phosphorus removal anoxic zone, a denitrification nitrogen removal anoxic zone, a phosphorus absorption nitrification aerobic zone, a primary sedimentation zone, a nitrification aerobic carrier zone, a denitrification oxygen elimination carrier zone, a secondary sedimentation zone, a quartz sand filtering zone, a water outlet zone and a disinfection zone which are sequentially connected from front to back, and is characterized by comprising the following steps of:
s1: the sewage to be treated enters an anaerobic phosphorus release area from a water inlet pipe, flows out from a channel at the bottom of a suspension partition wall, enters a static sedimentation area, one of residual sludge return pipes discharged from a primary sedimentation area is connected into the anaerobic phosphorus release area and is stirred by a submersible stirrer to be fully mixed with inlet water, and the carbon source in the raw water is utilized to fully release phosphorus;
s2: the static settling area is provided with an upper supernatant outlet pipe and a bottom muddy water mixture outlet pipe, supernatant with high static settling phosphorus concentration in the sewage to be treated is discharged from the upper supernatant outlet pipe, and sludge mixed liquor rich in phosphorus accumulating bacteria at the lower part of the static settling area is discharged from the bottom muddy water mixture outlet pipe;
s3: the denitrification dephosphorization anoxic zone is provided with a nitrifying liquid backflow water inlet pipe and a partition wall water outlet, the upper water inlet pipe is connected with a water outlet pipe of the dephosphorization sedimentation zone, the lower water inlet pipe is connected with a water outlet pipe of sludge-water mixed liquid at the lower part of the static sedimentation zone, the nitrifying liquid backflow water inlet pipe is connected with a denitrification backflow pipe of the denitrification anoxic carrier zone, and a submersible stirrer is arranged in the denitrification dephosphorization anoxic zone to fully mix the sludge and water in the zone;
s4: a water inlet of a partition wall of the denitrification and denitrification anoxic zone is connected with a water outlet of the partition wall of the denitrification and denitrification anoxic zone, a mixed liquid inlet pipe is connected with a mixed liquid outlet pipe at the lower part of the static settling zone, and the denitrification and denitrification anoxic zone is provided with a submersible stirrer and an aerator for fully mixing muddy water in the zone and supplementing dissolved oxygen in a proper amount;
s5: a water inlet of a partition wall of the phosphorus and nitrification aerobic zone is connected with a water outlet of a partition wall of the denitrification anoxic zone, and an aerator is arranged in the zone to aerate and oxygenate the sludge-water mixed liquid;
s6: a water inlet pipe of the primary sedimentation area is connected with a water outlet pipe of the phosphorus absorption and nitrification aerobic area, a first sludge discharge pipe conveys return sludge to the anaerobic phosphorus release area, and a second sludge discharge pipe conveys residual sludge to a sludge storage area;
s7: a water inlet pipe of the nitrification aerobic carrier area is connected with a water outlet pipe of the primary sedimentation area, PPC high-efficiency biological carriers are added into the area, the adding proportion is 15-40% of the tank volume, a perforated plate or a T-shaped wire screen pipe interception net is arranged at an outlet of the partition wall to prevent the carriers from flowing out of the area along with water flow, and an aerator is arranged in the area to oxygenate water in the three-way tank and provide power for carrier fluidization;
s8: a partition wall water inlet of the denitrification oxygen-eliminating carrier area is connected with a partition wall outlet of the nitrification aerobic carrier area, PPC high-efficiency biological carriers are added into the area, the adding proportion is 15-40% of the tank volume, a perforated plate or a T-shaped screen pipe intercepting net is arranged at a water outlet pipe to prevent the carriers from flowing out of the area along with water flow, a submersible stirrer is arranged in the area to provide power for carrier fluidization, and a water outlet pipe I conveys nitrification liquid to a denitrification nitrogen-removal oxygen-deficiency area;
s9: sludge discharged by a sludge discharge pipe of the secondary sedimentation area is connected into a sludge storage area, at least 3 groups of quartz sand filtering areas are arranged, regular back washing is alternately carried out, and back washing is carried out through combination of air washing, air water washing and water washing; the back flushing water flows back to the denitrification dephosphorization anoxic zone through the nitrifying liquid return pipe and is treated again;
s10: the water outlet area and the disinfection area are connected with a water inlet channel and a water outlet channel, an ultraviolet disinfection lamp is arranged in the water outlet channel, the water inlet channel is connected with a water outlet pipe of the quartz sand filtering area, qualified treated water is discharged from the water outlet channel, and a backwashing water pump is arranged in the water outlet area to perform backwashing on the quartz sand filtering pool.
2. The sewage treatment process according to claim 1, wherein: the anaerobic phosphorus release area is characterized in that a water inlet pipe is connected to one side of the anaerobic phosphorus release area, one end of the water inlet pipe is installed on one side of a water outlet suspension partition wall, the water outlet suspension partition wall is connected to one side of a static settlement area, an upper supernatant water outlet pipe is installed at the top of the static settlement area, and a bottom muddy water mixture outlet pipe is installed at the bottom of the static settlement area.
3. The wastewater treatment process according to claim 1, characterized in that: the dephosphorization flocculation reaction zone is connected with a water inlet pipe and a first dosing pipe and is provided with a long shaft stirrer, the bottom of the long shaft stirrer is connected with a water outlet pipe, and the water inlet pipe is connected with a supernatant water outlet pipe on the upper part of the static settling zone.
4. The wastewater treatment process according to claim 1, characterized in that: the dephosphorization sedimentation zone is connected with inlet tube, outlet pipe, and the bottom is equipped with the sludge discharge pipe, and the inlet tube is inserted by dephosphorization flocculation reaction zone outlet pipe, and bottom sludge discharge pipe sludge discharge inserts the mud storage area, denitrification nitrogen removal anoxic zone is connected with partition wall water inlet, partition wall delivery port and mixes liquid inlet tube.
5. The wastewater treatment process according to claim 1, characterized in that: inhale phosphorus nitrification aerobic zone and be connected with partition wall water inlet, outlet pipe and aeration air-supply line one, first settling zone is connected with inlet tube, outlet pipe, mud pipe one and mud pipe two, the inlet tube of first settling zone is inserted by inhaling phosphorus nitrification aerobic zone outlet pipe, nitrify aerobic carrier zoneoperation and be connected with inlet tube, partition wall effluent and aeration air-supply line two.
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