CN115611408A - Method and device for strengthening deep denitrification of integrated SPNAD system by adding sludge fermentation mixture in sections - Google Patents
Method and device for strengthening deep denitrification of integrated SPNAD system by adding sludge fermentation mixture in sections Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 139
- 238000000855 fermentation Methods 0.000 title claims abstract description 80
- 230000004151 fermentation Effects 0.000 title claims abstract description 78
- 239000000203 mixture Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005728 strengthening Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000010865 sewage Substances 0.000 claims abstract description 28
- 230000003647 oxidation Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 19
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 13
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 11
- 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 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 18
- 230000002572 peristaltic effect Effects 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 206010021143 Hypoxia Diseases 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 6
- 230000003203 everyday effect Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 5
- 238000011081 inoculation Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 3
- 229940079593 drug Drugs 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
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- 235000021391 short chain fatty acids Nutrition 0.000 claims description 3
- 206010002660 Anoxia Diseases 0.000 claims description 2
- 241000976983 Anoxia Species 0.000 claims description 2
- 230000007953 anoxia Effects 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 241000894006 Bacteria Species 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 3
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- 241000108664 Nitrobacteria Species 0.000 abstract description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- 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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A method and a device for strengthening deep denitrification of an integrated SPNAD system by adding sludge fermentation mixtures in sections belong to the field of municipal sewage treatment and sludge biochemical treatment. The device comprises a raw water tank, an SPNAD-SBR reactor and a sludge fermentation tank. The fermentation mixture enters an anaerobic section of the SPNAD-SBR reactor along with domestic sewage to store an internal carbon source, and partial short-cut nitrification is completed by utilizing different inhibition of the fermentation mixture on nitrifying bacteria in an aerobic section; the residual ammonia nitrogen and the generated nitrite are in the anoxic section A 1 Removing and generating byproduct nitrate nitrogen by using anaerobic ammonia oxidation; posterior to anoxic zone A 2 The fermentation mixture is added again, on one hand, nitrate nitrogen utilizes carbon source for denitrification and denitrificationOn the other hand, nitrite generated by short-cut denitrification and newly introduced ammonia nitrogen in the fermentation mixture generate anaerobic ammonia oxidation denitrification. The method makes full use of the organic carbon source in the sludge fermentation mixture and different inhibition effects on nitrobacteria, is favorable for realizing the recycling of the sludge and realizing the deep denitrification of the municipal sewage with low carbon-nitrogen ratio.
Description
Technical Field
The invention relates to a method and a device for strengthening deep denitrification of an integrated SPNAD system by adding sludge fermentation mixtures in sections, belongs to the field of municipal sewage treatment and sludge biochemical treatment, and is suitable for deep denitrification of municipal sewage and sludge reduction.
Background
At present, urban sewage treatment plants face two major problems, namely, the problems of insufficient carbon source, high energy consumption and low efficiency; and secondly, the excess sludge yield is high, and the treatment and disposal difficulty is high. How to develop a new process and effectively solve the problems of insufficient carbon source, large residual sludge yield and large treatment difficulty in urban sewage treatment is a hotspot problem of current research.
Anaerobic ammonia oxidation is used as a novel autotrophic nitrogen removal process, ammonia nitrogen and nitrite nitrogen can be directly converted into nitrogen under oxygen deficiency, and the requirements of low carbon and energy conservation are met. The partial shortcut nitrification, namely partial conversion of ammonia nitrogen into nitrite nitrogen, is combined with the shortcut nitrification anaerobic ammonia oxidation process PN/A, so that the aeration energy consumption is saved by 60% and the carbon source is saved by 100%. At present, methods for maintaining short-cut nitrification stability mainly comprise low DO control, temperature rise, low sludge age, inhibitor adding and the like, but the methods cannot completely inhibit the activity of nitrite oxidizing bacteria NOB, so that the effluent can possibly fail to reach the standard by producing byproduct nitrate nitrogen in the PN/A process treatment process. Therefore, PN/A is coupled with the denitrification technology, the advantages of the respective technologies are exerted, and the application of the novel technology in a mainstream sewage treatment plant can be further promoted. Of course, many challenges are faced, such as the realization of short-cut nitrification and the source of carbon sources required for denitrification.
Research shows that the residual sludge contains rich organic matters, and can be directly used as a supplementary carbon source of a biological denitrification process by directionally producing acid through an anaerobic fermentation technology, thereby solving the problem of carbon source deficiency in the denitrification process of urban domestic sewage. Besides, studies show that the short-cut nitrification can be rapidly realized and the stability can be maintained by adding the sludge fermentation mixture.
The method and the device for strengthening the deep denitrification of the integrated SPNAD system by adding the sludge fermentation mixture in sections take excess sludge and low-C/N urban domestic sewage as research objects, utilize the sludge fermentation mixture to have different inhibition effects on AOB and NOB, have stronger inhibition on the NOB and realize partial short-cut nitrification, utilize a carbon source generated by excess sludge fermentation to realize denitrification in an anoxic section, and simultaneously utilize anaerobic ammonia oxidation to realize deep denitrification. Not only saves the cost of an external carbon source and improves the denitrification efficiency, but also can realize the harmless treatment and resource utilization of the sludge.
Disclosure of Invention
The invention provides a method and a device for strengthening deep denitrification of an integrated SPNAD system by adding sludge fermentation mixtures in sections. Then enters a first anoxic section A of the SPNAD-SBR reactor 1 Ammonia nitrogen and nitrite are removed through the action of the fixed anaerobic ammonium oxidation bacteria filler, and a byproduct nitrate nitrogen is generated; then in a second anoxic section A 2 And adding the sludge fermentation mixture again to generate anaerobic ammonia oxidation synchronous denitrification, and finally realizing deep denitrification of the low C/N municipal sewage.
The invention is realized by the following technical scheme:
(1) A sludge fermentation system starting stage: the excess sludge alkaline fermentation tank (1) is a semi-continuous reactor, excess sludge in a secondary sedimentation tank of a sewage treatment plant is taken as inoculation sludge, the sludge concentration is controlled to be 10000-12000 mg/L, the sludge retention time is set to be 6-14 d, the temperature is controlled to be 25-35 ℃, and the pH value is controlled to be 9-10; discharging the excess sludge fermentation mixture to a fermentation mixture storage tank (1.8) every day according to the sludge age, and adding equal volume of fresh excess sludge to an excess sludge alkaline fermentation tank (1), wherein the concentration of the fermentation mixture is 8000-10000 mg/L; when the SCOD dissolubility chemical oxygen demand reaches 3000 +/-100 mg/L and is stabilized for more than 10 days and the SCFAs short chain fatty acid reaches 1000 +/-50 mgCOD/L and is stabilized for more than 10 days, the sludge fermentation tank (1) is considered to be started successfully, the subsequent system continuously controls the sludge concentration to be 10000-12000 mg/L, the sludge retention time is 6-14 days, the temperature is 25-35 ℃, and the pH is 9-10 to operate;
(2) Partial shortcut nitrification was achieved: injecting the whole course nitrified sludge serving as inoculated sludge into SBR (2), performing AO anaerobic-aerobic operation, and controlling the sludge concentration to be 2000-4000 mg/L; injecting actual urban domestic sewage serving as inlet water into a domestic sewage water tank (2.1), pumping the SBR (2) by a second peristaltic pump (2.2), namely a water inlet pump, and pumping the sludge fermentation mixture into the SBR (2) by a third peristaltic pump (2.4); setting the water inflow as 1/3-2/3 of the effective volume of the reactor, the adding amount of the sludge fermentation mixture as 1/30-1/20 of the water inflow volume, and the concentration of the fermentation mixture is 8000-10000 mg/L; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; running for 2-4 periods every day, maintaining the drainage ratio at 1/3-2/3, and controlling the sludge age at 4-10 d; each period comprises feeding water and sludge fermentation mixture for 0.25h, anaerobic stirring for 1-3 h, aerating for 1-3 h, precipitating for 1-2 h and discharging water for 0.25h; when the mass concentration ratio of the nitrite to the ammonia nitrogen in the effluent is in the range of 1.3-1.5 and is stably maintained for more than 10 days, the partial shortcut nitrification is considered to be successfully started;
(3) And (3) realizing anaerobic ammonia oxidation: inoculating and fixing anaerobic ammonium oxidation filler (2.6) into SBR (2) which realizes partial short-cut nitrification and stable operation, wherein the filler filling ratio is 20-80%, the system is changed from AO anaerobic-aerobic operation to AOA anaerobic-aerobic-anoxic operation, namely, an anoxic section A is added on the basis of partial short-cut nitrification 1 (ii) a Each period comprises water inlet, sludge inlet and fermentation mixture for 0.25h, anaerobic stirring for 1-3 h, aeration for 1-3 h, anoxic stirring for 2-4 h, precipitation for 1-2 h and water outlet for 0.25h; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; when the nitrite and ammonia nitrogen concentration of the effluent is lower than 1mg/L and stably maintained for more than 10 days, the anaerobic ammonia oxidation stage is considered to be successfully started;
(4) Implementation of SPNAD-SBR System: inoculation reactionThe nitrified sludge is converted into AOA from AOA anaerobic-aerobic-anoxic operation in SBR (2) which realizes partial nitrification anaerobic ammonia oxidation and stable operation 1 A 2 Anaerobic-aerobic-anoxic 1 -hypoxia 2 Running; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; the sludge concentration is controlled between 2000 and 4000mg/L, and the sludge concentration is controlled in a second anoxic section A 2 Adding a sludge fermentation mixture before starting, wherein the adding amount is 1/30-1/20 of the water inlet volume, the concentration of the sludge fermentation mixture is 8000-10000 mg/L, the sludge age is controlled at 4-10 d, and the anoxic section is prolonged for 1-3 h on the basis of realizing anaerobic ammonia oxidation; each period comprises feeding water and sludge for 0.25h, anaerobic stirring for 1-3 h, aerating for 1-3 h, and anoxia 1 Stirring for 2-4 h and oxygen deficiency 2 Stirring for 1-3 h, precipitating for 1-2 h, and discharging water for 0.25h; when the concentration of effluent nitrate nitrogen is reduced to 0.5-1 mg/L, the total nitrogen removal rate is higher than 90% and stably maintained for more than 10 days, the SPNAD system is considered to be realized and stabilized, and the follow-up system continuously maintains AOA 1 A 2 In the mode, the dissolved oxygen DO of the aerobic section is controlled to be 0.5-1 mg/L, the sludge concentration is 2000-4000 mg/L, and the sludge age is controlled to be 4-10 days.
In conclusion, the invention provides a method and a device for strengthening the deep denitrification of an integrated SPNAD system by adding sludge fermentation mixtures in stages, which take residual sludge and low-C/N municipal domestic sewage as research objects, fully utilize organic carbon sources in the sludge fermentation mixtures and different inhibiting effects on nitrobacteria, and combine an anaerobic ammonia oxidation process to improve the denitrification efficiency of the municipal sewage, thereby being beneficial to realizing the reduction and the recycling of the sludge and realizing the deep denitrification of the municipal sewage with low carbon-nitrogen ratio.
Drawings
FIG. 1 is a schematic diagram of a method and a device for enhancing deep denitrification of an integrated SPNAD system by adding sludge fermentation mixtures in stages.
In the figure: 1-residual sludge alkaline fermentation tank, 2-SPNAD-SBR; 1.1-residual sludge storage tank, 1.2-first peristaltic pump, 1.3-first stirrer, 1.4-first pH controller, 1.5-first temperature control device, 1.6-sodium hydroxide storage tank, 1.7-drug inlet pump and 1.8-fermentation mixture storage tank; 2.1-domestic sewage water tank, 2.2-second peristaltic pump, 2.3-second stirrer, 2.4-third peristaltic pump, 2.5-air compressor 2.6 fixed anaerobic ammonium oxidation filler, 2.7 second pH controller, 2.8 first dissolved oxygen controller, 2.9 water outlet box.
Fig. 2 shows the operation of the system.
Detailed Description
The patent application is further illustrated with reference to the attached figures and examples: as shown in figure 1, the effective volumes of the residual sludge alkaline fermentation tank, the sludge fermentation mixture storage tank, the domestic sewage water tank and the SPNAD-SBR are respectively 5L, 2L, 10L and 10L, wherein the residual sludge alkaline fermentation tank and the SPNAD-SBR are made of organic glass.
The device comprises a residual sludge storage tank (1.1), wherein residual sludge in the residual sludge storage tank is pumped into a residual sludge alkaline fermentation tank (1) through a first peristaltic pump (1.2), and a first stirrer (1.3), a first pH controller (1.4) and a first temperature control device (1.5) are arranged in the residual sludge alkaline fermentation tank (1); the sodium hydroxide storage tank (1.6) is connected with a first pH controller (1.4), and the first pH controller (1.4) controls the prepared sodium hydroxide solution to be pumped into the residual sludge alkaline fermentation tank (1) through a drug inlet pump (1.7) by detecting the pH in the residual sludge alkaline fermentation tank (1); discharging the product of the residual sludge alkaline fermentation tank (1) to a fermentation mixture storage tank (1.8), wherein the fermentation mixture storage tank (1.8) is connected with SPNAD-SBR (2) through a third peristaltic pump (2.4); the domestic sewage water tank (2.1) is connected with the SPNAD-SBR (2) through a second peristaltic pump, namely a water inlet pump (2.2); the SPNAD-SBR (2) is provided with a second stirrer (2.3), a fixed anaerobic ammonia oxidation filler (2.6), a first pH controller (2.7) and a first dissolved oxygen controller (2.8); an aeration head in the SPNAD-SBR (2) is connected with an air compressor (2.5), and the air compressor (2.5) provides oxygen for the reactor; the water outlet tank (2.9) is connected with the SPNAD-SBR (2);
the municipal domestic sewage used in the concrete example is taken from a septic tank in a certain family area, wherein the Chemical Oxygen Demand (COD) is 160-240 mg/L, the ammonia nitrogen concentration is 60-80 mg/L, the C/N ratio is 2-4, and the self carbon source can not meet the purpose of deep denitrification.
The specific implementation process is as follows:
the excess sludge alkaline fermentation tank (1) is a semi-continuous reactor, excess sludge in a secondary sedimentation tank of a sewage treatment plant is taken as inoculated sludge, the sludge concentration is controlled to be 10000-12000 mg/L, the sludge retention time is set to be 7d, the temperature is controlled to be 30 +/-1 ℃, and the pH is controlled to be 10 +/-0.5; discharging 0.7L of excess sludge fermentation mixture to a sludge fermentation mixture storage tank (1.8) every day according to the sludge age, and adding 0.7L of fresh sludge to the excess sludge fermentation tank (1);
the main indexes of the sludge fermentation mixture are as follows: the sludge concentration of the sludge fermentation mixture is 8000-10000 mg/L, the SCOD solubility chemical oxygen demand is 3465.0 +/-583 mg/L, and the SCFAs short-chain fatty acid is 1166 +/-237 mg COD/L;
injecting the whole course nitrified sludge serving as inoculation sludge into SBR (2), performing AO anaerobic-aerobic operation, and controlling the sludge concentration to be 2000-4000 mg/L; injecting actual urban domestic sewage serving as inlet water into a domestic sewage water tank (2.1), pumping the SBR (2) by a second peristaltic pump (2.2), namely a water inlet pump, and pumping the sludge fermentation mixture into the SBR (2) by a third peristaltic pump (2.4); setting the water quantity to be 1/2 of the effective volume of the reactor, the adding quantity of the sludge fermentation mixture to be 1/30 of the water inlet volume, and the sludge concentration of the sludge fermentation mixture to be 8000-10000 mg/L; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; running for 3 periods every day, maintaining the drainage ratio at 1/2, controlling the sludge age at 10d, wherein each period comprises water inlet of 0.25h, anaerobic stirring of 2.5h, aeration of 3h, sedimentation of 1h and water outlet of 0.25h; when the mass concentration ratio of nitrite to ammonia nitrogen in the effluent is 1.3-1.5 and stably maintained for more than 10 days, the partial shortcut nitrification is started;
inoculating and fixing anaerobic ammonium oxidation filler (2.6) into SBR (2) which realizes partial short-cut nitrification and stable operation, wherein the filler filling ratio is 40 percent, the system is changed from AO anaerobic-aerobic operation to AOA anaerobic-aerobic-anoxic operation, namely, an anoxic section A is added on the basis of partial short-cut nitrification 1 (ii) a Each period comprises water inlet of 0.25h, anaerobic stirring of 2.5h, aeration of 3h, anoxic stirring of 3h, sedimentation of 1h and water outlet of 0.25h; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; when the effluent is nitrite and ammonia nitrogen concentratedWhen the degrees are all lower than 1mg/L and stably maintained for more than 10 days, the anaerobic ammonia oxidation is considered to be successfully started;
inoculating denitrifying sludge into SBR (2) which realizes partial short-cut nitrification anaerobic ammonia oxidation and stable operation, and converting AOA anaerobic-aerobic-anoxic operation into AOA 1 A 2 Anaerobic-aerobic-anoxic 1 -hypoxia 2 The operation is carried out, and the anoxic section is prolonged for 1h on the basis of realizing anaerobic ammonia oxidation; each period comprises feeding water for 0.25h, anaerobic stirring for 2.5h, aerating for 3h, and anoxic 1 Stirring for 3h and oxygen deficiency 2 Stirring for 1h, precipitating for 1h, and discharging water for 0.25h; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; the sludge concentration is controlled between 2000 and 4000mg/L, and the sludge concentration is controlled in a second anoxic section A 2 Adding a sludge fermentation mixture before starting, wherein the adding amount is 1/30 of the water inlet volume, the sludge concentration of the sludge fermentation mixture is 8000-10000 mg/L, and the sludge age is controlled to be 10 days; when the concentration of effluent nitrate nitrogen is reduced to 0.5-1 mg/L, the total nitrogen removal rate is higher than 90% and is stably maintained for more than 10 days, the SPNAD system is considered to be realized and stabilized, and the AOA is continuously maintained subsequently 1 A 2 Anaerobic-aerobic-anoxic 1 -hypoxia 2 And in the mode, the dissolved oxygen DO of the aerobic section is controlled to be 0.5-1 mg/L, sludge fermentation products are added into the anoxic section in a segmented mode, the sludge concentration is 2000-4000 mg/L, and the sludge is aged for 4-10 days.
The experimental results show that: after the operation is stable, the COD concentration in the effluent is 30-45 mg/L, the ammonia nitrogen concentration is 0-3 mg/L, the nitrite accumulation rate can reach 90% or above, and the TN removal rate is 90-95%.
Claims (2)
1. The device for strengthening the deep denitrification of the integrated SPNAD system by adding sludge fermentation mixtures in sections is characterized by comprising a first stirrer (1.3), a first pH controller (1.4) and a first temperature control device (1.5), wherein residual sludge in a residual sludge storage tank (1.1) is pumped into a residual sludge alkaline fermentation tank (1) through a first peristaltic pump (1.2); the sodium hydroxide storage tank (1.6) is connected with a first pH controller (1.4), and the first pH controller (1.4) controls the prepared sodium hydroxide solution to be pumped into the excess sludge alkaline fermentation tank (1) through a drug inlet pump (1.7) by detecting the pH in the excess sludge alkaline fermentation tank (1); discharging the product of the residual sludge alkaline fermentation tank (1) to a fermentation mixture storage tank (1.8), wherein the fermentation mixture storage tank (1.8) is connected with SPNAD-SBR (2) through a third peristaltic pump (2.4); the domestic sewage water tank (2.1) is connected with the SPNAD-SBR (2) through a second peristaltic pump, namely a water inlet pump (2.2); the SPNAD-SBR (2) is provided with a second stirrer (2.3), a fixed anaerobic ammonium oxidation filler (2.6), a first pH controller (2.7) and a first dissolved oxygen controller (2.8); an aeration head in the SPNAD-SBR (2) is connected with an air compressor (2.5), and the air compressor (2.5) provides oxygen for the reactor; the water outlet tank (2.9) is connected with the SPNAD-SBR (2).
2. The method for strengthening the deep denitrification of the integrated SPNAD system by adding the sludge fermentation mixture in stages by using the device of claim 1 is characterized by comprising the following steps:
(1) A sludge fermentation system starting stage: the excess sludge alkaline fermentation tank (1) is a semi-continuous reactor, excess sludge in a secondary sedimentation tank of a sewage treatment plant is taken as inoculation sludge, the sludge concentration is controlled to be 10000-12000 mg/L, the sludge retention time is set to be 6-14 d, the temperature is controlled to be 25-35 ℃, and the pH value is controlled to be 9-10; discharging the excess sludge fermentation mixture to a fermentation mixture storage tank (1.8) every day according to the sludge age, and adding equal volume of fresh excess sludge to an excess sludge alkaline fermentation tank (1), wherein the concentration of the fermentation mixture is 8000-10000 mg/L; when the SCOD dissolubility chemical oxygen demand reaches 3000 +/-100 mg/L and is stabilized for more than 10 days and the SCFAs short chain fatty acid reaches 1000 +/-50 mgCOD/L and is stabilized for more than 10 days, the sludge fermentation tank (1) is considered to be started successfully, the subsequent system continuously controls the sludge concentration to be 10000-12000 mg/L, the sludge retention time is 6-14 days, the temperature is 25-35 ℃, and the pH is 9-10 to operate;
(2) Partial shortcut nitrification was achieved: injecting the whole course nitrified sludge serving as inoculated sludge into SBR (2), performing AO anaerobic-aerobic operation, and controlling the sludge concentration to be 2000-4000 mg/L; injecting actual urban domestic sewage serving as inlet water into a domestic sewage water tank (2.1), pumping the SBR (2) by a second peristaltic pump (2.2), namely a water inlet pump, and pumping the sludge fermentation mixture into the SBR (2) by a third peristaltic pump (2.4); setting the water inflow as 1/3-2/3 of the effective volume of the reactor, the adding amount of the sludge fermentation mixture as 1/30-1/20 of the water inflow volume, and the concentration of the fermentation mixture is 8000-10000 mg/L; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; running for 2-4 periods every day, maintaining the drainage ratio at 1/3-2/3, and controlling the sludge age at 4-10 d; each period comprises feeding water and sludge fermentation mixture for 0.25h, anaerobic stirring for 1-3 h, aerating for 1-3 h, precipitating for 1-2 h and discharging water for 0.25h; when the mass concentration ratio of the nitrite to the ammonia nitrogen in the effluent is in the range of 1.3-1.5 and is stably maintained for more than 10 days, the partial shortcut nitrification is considered to be successfully started;
(3) And (3) realizing anaerobic ammonia oxidation: inoculating and fixing anaerobic ammonium oxidation filler (2.6) into SBR (2) which realizes partial short-cut nitrification and stable operation, wherein the filler filling ratio is 20-80%, the system is changed from AO anaerobic-aerobic operation to AOA anaerobic-aerobic-anoxic operation, namely, an anoxic section A is added on the basis of partial short-cut nitrification 1 (ii) a Each period comprises feeding water and sludge fermentation mixture for 0.25h, anaerobic stirring for 1-3 h, aeration for 1-3 h, anoxic stirring for 2-4 h, precipitation for 1-2 h and water outlet for 0.25h; wherein the dissolved oxygen of the aerobic section is maintained at 0.5-1 mg/L by a real-time control device; when the nitrite and ammonia nitrogen concentration of the effluent is lower than 1mg/L and stably maintained for more than 10 days, the anaerobic ammonia oxidation stage is considered to be successfully started;
(4) Implementation of SPNAD-SBR System: inoculating denitrifying sludge into SBR (2) which realizes partial short-cut nitrification anaerobic ammonia oxidation and stable operation, and converting AOA anaerobic-aerobic-anoxic operation into AOA 1 A 2 Anaerobic-aerobic-anoxic 1 -hypoxia 2 Running; maintaining the dissolved oxygen DO of the aerobic section at 0.5-1 mg/L by a real-time control device; the sludge concentration is controlled between 2000 and 4000mg/L, and the sludge concentration is controlled in a second anoxic section A 2 Adding a sludge fermentation mixture before starting, wherein the adding amount is 1/30-1/20 of the water inlet volume, the concentration of the sludge fermentation mixture is 8000-10000 mg/L, the sludge age is controlled to be 4-10 d, and the anoxic section is prolonged for 1-3 h on the basis of realizing anaerobic ammonia oxidation; each period comprises feeding water and sludge for 0.25h, anaerobic stirring for 1-3 h, aerating for 1-3 h, and anoxia 1 Stirring for 2-4 h and oxygen deficiency 2 Stirring for 1-3 h, precipitating for 1-2 h, and discharging water for 0.25h; when the nitrate nitrogen is concentrated in the effluentWhen the degree is reduced to 0.5-1 mg/L, the total nitrogen removal rate is higher than 90 percent and is stably maintained for more than 10 days, the SPNAD system is considered to be realized and stable, and the follow-up system continuously maintains AOA 1 A 2 And in the mode, the dissolved oxygen DO of the aerobic section is controlled to be 0.5-1 mg/L, the sludge concentration is 2000-4000 mg/L, and the sludge age is 4-10 days.
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