CN113800636A - Method and device for treating sludge digestive juice by coupling shortcut nitrification/anaerobic ammonia oxidation-fermentation with shortcut denitrification/anaerobic ammonia oxidation - Google Patents
Method and device for treating sludge digestive juice by coupling shortcut nitrification/anaerobic ammonia oxidation-fermentation with shortcut denitrification/anaerobic ammonia oxidation Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 239000010802 sludge Substances 0.000 title claims abstract description 153
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 106
- 230000003647 oxidation Effects 0.000 title claims abstract description 105
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 100
- 238000000855 fermentation Methods 0.000 title claims abstract description 46
- 230000008878 coupling Effects 0.000 title claims abstract description 43
- 238000010168 coupling process Methods 0.000 title claims abstract description 43
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001079 digestive effect Effects 0.000 title abstract description 19
- 235000011389 fruit/vegetable juice Nutrition 0.000 title abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims abstract description 57
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005273 aeration Methods 0.000 claims abstract description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 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 18
- 241000894006 Bacteria Species 0.000 claims abstract description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 16
- 230000029087 digestion Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 239000012528 membrane Substances 0.000 claims abstract description 4
- 230000020477 pH reduction Effects 0.000 claims abstract description 3
- 230000004151 fermentation Effects 0.000 claims description 36
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 22
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 20
- 238000012806 monitoring device Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
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- 230000003203 everyday effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 6
- 230000001651 autotrophic effect Effects 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 235000017281 sodium acetate Nutrition 0.000 claims description 6
- 239000001632 sodium acetate Substances 0.000 claims description 6
- 238000011081 inoculation Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims 1
- 238000006460 hydrolysis reaction Methods 0.000 claims 1
- 238000006396 nitration reaction Methods 0.000 claims 1
- 241001453382 Nitrosomonadales Species 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 7
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- 239000005431 greenhouse gas Substances 0.000 abstract 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C02F2301/04—Flow arrangements
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- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
A method and a device for treating sludge digestion liquid by coupling short-cut nitrification/anaerobic ammonia oxidation-fermentation with short-cut denitrification/anaerobic ammonia oxidation belong to the field of biochemical treatment of sludge digestion liquid. After the sludge digestion liquid enters the SBR reactor, a pre-anoxic/aerobic/anoxic operation mode is adopted, organic matters and residual nitrate nitrogen in the raw water in the last period are removed through heterotrophic bacteria and denitrifying bacteria, partial total nitrogen in the raw water is removed through ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria on a biological membrane, effluent enters the UASB reactor, and total nitrogen in the effluent is further reduced through the combined action of hydrolytic acidification bacteria, denitrifying bacteria and anaerobic ammonia oxidizing bacteria in granular sludge. The invention does not need additional carbon source, saves aeration energy consumption and can reduce the emission of greenhouse gas, solves the problem of unstable denitrification effect of the system due to easy loss of anaerobic ammonium oxidation sludge by utilizing the biomembrane and the granular sludge, improves the denitrification load and the stability of the system, and realizes the deep denitrification of sludge digestive juice and the reduction and the recycling of sludge.
Description
Technical Field
The invention relates to a method and a device for treating sludge digestive juice and treating excess sludge based on a shortcut nitrification/anaerobic ammonia oxidation-fermentation coupling shortcut denitrification/anaerobic ammonia oxidation process, belonging to the technical field of sludge digestive juice biochemical treatment and sludge reduction. The method comprises the steps of firstly realizing half-short-cut nitrification in an SBR reactor by controlling aeration, then performing anaerobic ammonia oxidation autotrophic nitrogen removal, finally realizing the coupling of sludge fermentation, short-cut denitrification and anaerobic ammonia oxidation in an UASB reactor, achieving the purpose of deep nitrogen removal of sludge digestive juice without adding a carbon source, realizing sludge reduction and recycling, and simultaneously enhancing the stability of the system by using a biomembrane and granular sludge in the reactor. The technology is suitable for advanced treatment of sludge digestive fluid and sludge reduction treatment.
Background
With the rapid development of the economy of China, sewage and wastewater generated in various industries is discharged into a receiving water body without proper treatment, a series of eutrophication phenomena such as water bloom, red tide and the like are caused, the dissolved oxygen of the receiving water body is reduced, the water quality is deteriorated, the survival of fishes and other organisms is influenced, and the water ecological balance is damaged.
The sludge is an unavoidable byproduct in the sewage treatment process, and when the excess sludge and the primary sludge are digested in the sludge digestion tank, the organic nitrogen in the solid phase is converted into ammonia nitrogen in the liquid phase, so that the sludge digestion liquid becomes wastewater with high ammonia nitrogen and low C/N ratio. The sludge digestion liquid is usually refluxed to a main reaction zone at the front end of a sewage treatment plant for treatment, so that the problems of high aeration energy consumption, expensive added carbon source cost and large residual sludge yield of the traditional sewage treatment plant in China are more prominent. In order to solve the problem of water eutrophication, China sets up strict sewage discharge standards and has higher requirements on the process of sewage treatment plants. Anaerobic ammonia oxidizing bacteria on the biomembrane can utilize nitrite nitrogen and ammonia nitrogen to carry out autotrophic denitrification, so that the aeration quantity and the cost of an external carbon source are reduced, the problem that the anaerobic ammonia oxidizing bacteria are difficult to retain is solved, a stable nitrite nitrogen source can be provided for anaerobic ammonia oxidation by semi-shortcut nitrification, but a large amount of nitrate nitrogen still remains in effluent when sludge digestive juice is treated by shortcut nitrification/anaerobic ammonia oxidation, and the requirement of deep denitrification of the sludge digestive juice cannot be met.
Therefore, the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation process after the short-cut nitrification/anaerobic ammonia oxidation can realize the deep denitrification of the sludge digestive fluid and can achieve the purposes of reducing, stabilizing and recycling the residual sludge.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the problems of deep denitrification of sludge digestive juice and sludge reduction and resource utilization, and provides a device and a method based on a shortcut nitrification/anaerobic ammonia oxidation-fermentation coupling shortcut denitrification/anaerobic ammonia oxidation process.
After the sludge digestion liquid enters the SBR reactor, a pre-anoxic/aerobic/anoxic operation mode is adopted, organic matters and residual nitrate nitrogen in the raw water in the last period are removed through heterotrophic bacteria and denitrifying bacteria, then partial total nitrogen in the raw water is removed through ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria on a biological membrane, the effluent enters the UASB reactor, and the total nitrogen in the effluent is further reduced through the combined action of hydrolytic acidification bacteria, denitrifying bacteria and anaerobic ammonia oxidizing bacteria in granular sludge. The invention utilizes the biological membrane and the granular sludge to solve the problem of unstable denitrification effect of the system caused by easy loss of the anaerobic ammonium oxidation sludge, improves the denitrification load and the stability of the system, realizes the deep denitrification of sludge digestive fluid and the reduction and the resource of the sludge, simultaneously reduces the external carbon source amount and the aeration amount, and reduces the treatment cost of the wastewater with high ammonia nitrogen and low C/N ratio.
The invention is realized by the following technical scheme:
the method and the device for treating the sludge digestive juice by short-cut nitrification/anaerobic ammonia oxidation-fermentation coupling short-cut denitrification/anaerobic ammonia oxidation are characterized by comprising the following steps: the system comprises a raw water tank (1), a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2), an intermediate water tank (3), a sludge storage tank (4) and a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5);
the raw water tank (1) is provided with a water outlet (1.1); the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is provided with a first water inlet pump (2.1), a water inlet (2.2), an aeration pump (2.3), a gas flowmeter (2.4), a pH/DO real-time monitoring device (2.5), a pH probe (2.6), a DO probe (2.7), a stirrer (2.8), an aeration disc (2.9), a water outlet (2.10), a drain valve (2.11), a sludge discharge port (2.12), a sludge discharge valve (2.13) and a filler frame (2.14); the middle water tank (3) is provided with a middle water tank water inlet (3.1) and a middle water tank water outlet (3.2); the mud storage box (4) is provided with a mud inlet (4.1) and a mud outlet (4.2); the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is provided with a gas collecting device (5.1), a second water inlet pump (5.2), a sludge inlet pump (5.3), a three-phase separator (5.4), a sampling port (5.5), an emptying valve (5.6), a water outlet pipe (5.7) and a reflux pump (5.8);
a water outlet (1.1) of a raw water tank (1) is connected with a water inlet (2.2) of a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through a first water inlet pump (2.1), air is pumped into the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through an aeration pump (2.3), a gas flowmeter (2.4) and an aeration disc (2.9) in sequence, and the pH value and the DO value of the air are monitored through a pH/DO real-time monitoring device (2.5); a water outlet (2.10) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a drain valve (2.11); a sludge discharge port (2.12) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a sludge discharge valve (2.13); a water outlet (3.2) of the intermediate water tank (3) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a second water inlet pump (5.2); a sludge outlet of the sludge storage tank (4) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a sludge inlet pump (5.3); the effluent of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is discharged through a water outlet pipe (5.7).
The invention also provides a method for treating sludge digestive juice by coupling shortcut nitrification/anaerobic ammonium oxidation-fermentation with shortcut denitrification/anaerobic ammonium oxidation, which comprises the following steps:
1) startup of system
(1) Starting a short-cut nitrification/anaerobic ammonia oxidation SBR reactor: the inoculated sludge of the SBR reactor is short-cut nitrification activated sludge, the sludge concentration in the reactor after inoculation is controlled to be 3000-5000mg/L, and the sludge age is controlled to be 25-30d by sludge discharge; controlling COD concentration in a raw water tank to be 120-200mg/L and ammonia nitrogen concentration to be 200-400mg/L, controlling DO to be maintained at 1-1.5mg/L through a DO real-time monitoring device, setting the drainage ratio of a reactor to be 0.5-0.7, and operating for 4-6 periods every day, wherein each period comprises water inlet, aeration stirring, sedimentation, drainage and idling; running the reactor under the conditions, and realizing partial short-cut nitrification when the mass concentration ratio of ammonia nitrogen to nitrite nitrogen in the effluent is 1-1.32 and lasts for more than 15 days; then inoculating a fixed filler attached with anaerobic ammonium oxidation bacteria into the SBR reactor, wherein the volume of the fixed filler accounts for 25-30% of the effective volume of the reactor, controlling the DO of an aerobic section to be 1-1.5mg/L through a DO real-time monitoring device, controlling the water discharge ratio of the reactor to be 0.5-0.7, operating for 3-4 periods each day, wherein each period comprises water inlet, anoxic stirring, aerobic stirring, anoxic stirring, sedimentation, water discharge and idling, operating the reactor under the conditions, and when the concentrations of ammonia nitrogen and nitrite nitrogen in the outlet water are all less than 1mg/L and stably operating for more than 15 days, considering that the short-cut nitrification/anaerobic ammonium oxidation SBR reactor is successfully started.
(2) Starting a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor: inoculating anaerobic ammonia oxidation granular sludge into a UASB reactor, wherein the concentration of the inoculated sludge is 3000-4000mg/L, the retention time of the UASB reactor is 3-5h, the sludge age is 20-25d, the inflow water adopts artificial water distribution with the mass ratio of nitrite nitrogen to ammonia nitrogen being 1.3, the concentration of TN is 20-30mg/L, and when the total nitrogen removal rate reaches more than 90% and continuously maintains for more than 15 days, the acclimation of anaerobic ammonia oxidation bacteria in the UASB reactor is completed; then inoculating short-range denitrification activated sludge into a UASB reactor, controlling the sludge concentration in the reactor after inoculation to be 7000-8000mg/L, adopting artificial water distribution containing ammonia nitrogen, nitrate nitrogen and sodium acetate for inlet water, controlling the mass ratio of the nitrate nitrogen to the ammonia nitrogen in the inlet water to be 1.5, controlling the total nitrogen concentration to be 20-40mg/L and the SCOD concentration to be 40-80mg/L, and completing the coupling of anaerobic ammonia oxidation and short-range denitrification in the UASB reactor when the total nitrogen removal rate of system outlet water reaches more than 85% and continuously maintains for more than 15 days; and finally, replacing sodium acetate with the residual sludge as a denitrification carbon source to maintain the concentration of SCOD at 40-80mg/L, and when the total nitrogen removal rate reaches more than 85% and is continuously maintained for 15 days, considering that the fermentation coupled short-cut denitrification/anaerobic ammonia oxidation UASB reactor is successfully started.
2) Operation of the System
(1) And (3) opening a first water inlet pump, pumping the sludge digestion liquid in the raw water tank into the SBR reactor, wherein the SBR reactor operates in an A/O/A (anoxic/aerobic/anoxic) mode, after water is fed, starting a stirrer in the pre-anoxic section shortcut nitrification/anaerobic ammonia oxidation reactor, stirring for 30min in an anoxic mode, and removing the residual nitrate nitrogen in the previous period by using the denitrification of organic matters in the raw water. After the pre-anoxic section is finished, an aeration pump is started to aerate the shortcut nitrification/anaerobic ammonia oxidation reactor, ammonia nitrogen in raw water is partially converted into nitrite nitrogen, DO is controlled to be 1-1.5mg/L by adjusting a gas flow meter, pH and DO values are monitored by a pH/DO online monitoring device, aerobic stirring time is 120-plus-one time 180min, after the aeration is finished, an aeration pump in the shortcut nitrification/anaerobic ammonia oxidation SBR reactor is closed, anoxic stirring is 180-plus-one time 210min, anaerobic ammonia oxidation on a biomembrane utilizes residual ammonia nitrogen and nitrite nitrogen to carry out autotrophic denitrification, then sedimentation is carried out for 30min to separate sludge and water, a first drainage valve is opened, drainage enters an intermediate water tank, the drainage ratio is 70%, the operation is carried out for 3 periods every day, and the rest time is idle.
(2) Opening a second water inlet pump, pumping the sewage in the middle water tank into the UASB reactor, simultaneously pumping the residual sludge in the sludge storage tank into the UASB reactor through a sludge inlet pump, controlling the sludge concentration in the UASB reactor to be 7000 plus materials 8000mg/L, controlling the hydraulic retention time to be 3-5h, the sludge age to be 20-25d, and controlling the internal circulation reflux ratio to be 100 plus materials to be 120%; and operating the UASB reactor under the conditions to realize the coupling treatment of the excess sludge and the nitrate nitrogen wastewater in the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation reactor, and discharging the effluent and the sludge of the UASB reactor through a water outlet pipe and an emptying valve.
The technical principle of the invention is as follows:
the sludge digestive fluid enters an SBR reactor, denitrification is carried out in a pre-anoxic section, residual nitrate nitrogen in the upper period is removed, semi-short-cut nitrification is carried out in an aerobic section, part of ammonia nitrogen is oxidized into anaerobic ammonia oxidation reaction of a subsequent anoxic section to provide a substrate, the effluent of the SBR reactor contains nitrate nitrogen with higher concentration, the nitrate nitrogen is discharged into an intermediate water tank and then enters an UASB reactor together with residual sludge in a sludge storage tank, the coupling of residual sludge fermentation, short-cut denitrification and anaerobic ammonia oxidation is completed, the short-cut denitrification is carried out by utilizing volatile fatty acid generated by residual sludge fermentation, meanwhile, nitrite nitrogen provided by the short-cut denitrification and ammonia nitrogen provided by sludge fermentation are utilized to carry out anaerobic ammonia oxidation, and the synchronous and efficient sludge digestive fluid treatment by sludge fermentation is realized. The key point of the invention is that the biomembrane in the SBR reactor and the granular sludge in the UASB reactor improve the retention rate of the anaerobic ammonium oxidation bacteria so as to enhance the stability of the system, the realization of the semi-short-cut nitrification in the SBR reactor needs to regulate and control DO and pH, and the aeration time is controlled to control the mass ratio of nitrite nitrogen to ammonia nitrogen to be 1.32 so as to maintain the environment suitable for the survival of the anaerobic ammonium oxidation bacteria.
Compared with the prior art, the invention has the following advantages:
(1) the low-aeration autotrophic nitrogen removal is realized by coupling the short-cut nitrification with the anaerobic ammonia oxidation, and the short-cut denitrification/anaerobic ammonia oxidation process is coupled in series with the fermentation, so that the excess sludge is reduced, stabilized and recycled while the sludge digestive fluid is deeply denitrified.
(2) The method integrates the fermentation of the excess sludge, the short-range denitrification and the anaerobic ammonia oxidation, and directly adds the excess sludge into a fermentation coupling short-range denitrification/anaerobic ammonia oxidation UASB reactor, thereby reducing the floor area of the process, avoiding the complicated steps of the traditional sludge fermentation process and reducing the treatment cost.
(3) In the process of fermentation coupling short-cut denitrification/anaerobic ammonia oxidation after short-cut nitrification/anaerobic ammonia oxidation, the existence of the biomembrane and the granular sludge improves the retention rate of anaerobic ammonia oxidation bacteria, and simultaneously, due to the existence of the subsequent fermentation coupling short-cut denitrification/anaerobic ammonia oxidation process, the denitrification effect is ensured, and the stability of the whole denitrification system and the capability of resisting nitrogen load impact are enhanced.
Drawings
FIG. 1 is a schematic structural diagram of a sludge digestion liquid treatment device with partial nitrification/anaerobic ammonia oxidation-fermentation coupling partial denitrification/anaerobic ammonia oxidation.
FIG. 2 is a timing diagram showing the operation of the shortcut nitrification/anaerobic ammonia oxidation SBR reactor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the method and the device for treating sludge digestive juice by coupling shortcut nitrification/anaerobic ammonium oxidation-fermentation with shortcut denitrification/anaerobic ammonium oxidation are characterized by comprising the following steps: the system comprises a raw water tank (1), a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2), an intermediate water tank (3), a sludge storage tank (4) and a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5);
the raw water tank (1) is provided with a water outlet (1.1); the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is provided with a first water inlet pump (2.1), a water inlet (2.2), an aeration pump (2.3), a gas flowmeter (2.4), a pH/DO real-time monitoring device (2.5), a pH probe (2.6), a DO probe (2.7), a stirrer (2.8), an aeration disc (2.9), a water outlet (2.10), a drain valve (2.11), a sludge discharge port (2.12), a sludge discharge valve (2.13) and a filler frame (2.14); the middle water tank (3) is provided with a middle water tank water inlet (3.1) and a middle water tank water outlet (3.2); the mud storage box (4) is provided with a mud inlet (4.1) and a mud outlet (4.2); the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is provided with a gas collecting device (5.1), a second water inlet pump (5.2), a sludge inlet pump (5.3), a three-phase separator (5.4), a sampling port (5.5), an emptying valve (5.6), a water outlet pipe (5.7) and a reflux pump (5.8);
a water outlet (1.1) of a raw water tank (1) is connected with a water inlet (2.2) of a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through a first water inlet pump (2.1), air is pumped into the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through an aeration pump (2.3), a gas flowmeter (2.4) and an aeration disc (2.9) in sequence, and the pH value and the DO value of the air are monitored through a pH/DO real-time monitoring device (2.5); a water outlet (2.10) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a drain valve (2.11); a sludge discharge port (2.12) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a sludge discharge valve (2.13); a water outlet (3.2) of the intermediate water tank (3) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a second water inlet pump (5.2); a sludge outlet of the sludge storage tank (4) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a sludge inlet pump (5.3); the effluent of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is discharged through a water outlet pipe (5.7).
The specific experimental water adopts sludge nitrification liquid of a sewage treatment plant as raw water, and the specific water quality is as follows: the pH value is 6.5-7.5, the COD concentration is 150-240mg/L, the ammonia nitrogen concentration is 200-400mg/L, the nitrite nitrogen and the nitrate nitrogen are both below the detection limit, and the COD/N ratio is 0.375-1.2. The sludge added in each day in the experiment is the returned sludge (the sludge concentration is 8000-10000mg/L) of the reclaimed water plant of the high tombstone store in Beijing and the excess sludge (the sludge concentration is 3000-5000mg/L) discharged by the short-cut nitrification/anaerobic ammonia oxidation SBR reactor. The effective volume of SBR used in the short-cut nitrification/anaerobic ammonia oxidation SBR reactor is 10L, the water discharge ratio is 0.7, and the reactor is operated for 3 periods every day. The effective volume of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor is 5L, and the hydraulic retention time is 3 h.
The specific operation process is as follows:
1) startup of system
(1) Starting a short-cut nitrification/anaerobic ammonia oxidation SBR reactor: the inoculated sludge of the SBR reactor is short-cut nitrification activated sludge, the sludge concentration in the reactor after inoculation is controlled to be 3000-5000mg/L, and the sludge age is controlled to be 25-30d by sludge discharge; controlling COD concentration in a raw water tank to be 120-200mg/L and ammonia nitrogen concentration to be 200-400mg/L, controlling DO to be maintained at 1-1.5mg/L through a DO real-time monitoring device, setting the drainage ratio of a reactor to be 0.5-0.7, and operating for 4-6 periods every day, wherein each period comprises water inlet, aeration stirring, sedimentation, drainage and idling; running the reactor under the conditions, and realizing partial short-cut nitrification when the mass concentration ratio of ammonia nitrogen to nitrite nitrogen in the effluent is 1-1.32 and lasts for more than 15 days; then inoculating a fixed filler attached with anaerobic ammonium oxidation bacteria into the SBR reactor, wherein the volume of the fixed filler accounts for 25-30% of the effective volume of the reactor, controlling the DO of an aerobic section to be 1-1.5mg/L through a DO real-time monitoring device, controlling the water discharge ratio of the reactor to be 0.5-0.7, operating for 3-4 periods each day, wherein each period comprises water inlet, anoxic stirring, aerobic stirring, anoxic stirring, sedimentation, water discharge and idling, operating the reactor under the conditions, and when the concentrations of ammonia nitrogen and nitrite nitrogen in the outlet water are all less than 1mg/L and stably operating for more than 15 days, considering that the short-cut nitrification/anaerobic ammonium oxidation SBR reactor is successfully started.
(2) Starting a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor: inoculating anaerobic ammonia oxidation granular sludge into a UASB reactor, wherein the concentration of the inoculated sludge is 3000-4000mg/L, the retention time of the UASB reactor is 3-5h, the sludge age is 20-25d, the inflow water adopts artificial water distribution with the mass ratio of nitrite nitrogen to ammonia nitrogen being 1.3, the concentration of TN is 20-30mg/L, and when the total nitrogen removal rate reaches more than 90% and continuously maintains for more than 15 days, the acclimation of anaerobic ammonia oxidation bacteria in the UASB reactor is completed; then inoculating short-range denitrification activated sludge into a UASB reactor, controlling the sludge concentration in the reactor after inoculation to be 7000-8000mg/L, adopting artificial water distribution containing ammonia nitrogen, nitrate nitrogen and sodium acetate for inlet water, controlling the mass ratio of the nitrate nitrogen to the ammonia nitrogen in the inlet water to be 1.5, controlling the total nitrogen concentration to be 20-40mg/L and the SCOD concentration to be 40-80mg/L, and completing the coupling of anaerobic ammonia oxidation and short-range denitrification in the UASB reactor when the total nitrogen removal rate of system outlet water reaches more than 85% and continuously maintains for more than 15 days; and finally, replacing sodium acetate with the residual sludge as a denitrification carbon source to maintain the concentration of SCOD at 40-80mg/L, and when the total nitrogen removal rate reaches more than 85% and is continuously maintained for 15 days, considering that the fermentation coupled short-cut denitrification/anaerobic ammonia oxidation UASB reactor is successfully started.
2) Operation of the System
(1) And (3) opening a first water inlet pump, pumping the sludge digestion liquid in the raw water tank into the SBR reactor, wherein the SBR reactor operates in an A/O/A (anoxic/aerobic/anoxic) mode, after water is fed, starting a stirrer in the pre-anoxic section shortcut nitrification/anaerobic ammonia oxidation reactor, stirring for 30min in an anoxic mode, and removing the residual nitrate nitrogen in the previous period by using the denitrification of organic matters in the raw water. After the pre-anoxic section is finished, an aeration pump is started to aerate the shortcut nitrification/anaerobic ammonia oxidation reactor, ammonia nitrogen in raw water is partially converted into nitrite nitrogen, DO is controlled to be 1-1.5mg/L by adjusting a gas flow meter, pH and DO values are monitored by a pH/DO online monitoring device, aerobic stirring time is 120-plus-one time 180min, after the aeration is finished, an aeration pump in the shortcut nitrification/anaerobic ammonia oxidation SBR reactor is closed, anoxic stirring is 180-plus-one time 210min, anaerobic ammonia oxidation on a biomembrane utilizes residual ammonia nitrogen and nitrite nitrogen to carry out autotrophic denitrification, then sedimentation is carried out for 30min to separate sludge and water, a first drainage valve is opened, drainage enters an intermediate water tank, the drainage ratio is 70%, the operation is carried out for 3 periods every day, and the rest time is idle.
(2) Opening a second water inlet pump, pumping the sewage in the middle water tank into the UASB reactor, simultaneously pumping the residual sludge in the sludge storage tank into the UASB reactor through a sludge inlet pump, controlling the sludge concentration in the UASB reactor to be 7000 plus materials 8000mg/L, controlling the hydraulic retention time to be 3-5h, the sludge age to be 20-25d, and controlling the internal circulation reflux ratio to be 100 plus materials to be 120%; and operating the UASB reactor under the conditions to realize the coupling treatment of the excess sludge and the nitrate nitrogen wastewater in the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation reactor, and discharging the effluent and the sludge of the UASB reactor through a water outlet pipe and an emptying valve.
The results of successive experiments show that: after the operation is stable, the final effluent ammonia nitrogen of the reactor is less than 5mg/L, the total effluent nitrogen is less than 15mg/L, and the effluent COD is less than 50mg/L, so that the deep denitrification of the sludge digestive fluid is realized, and the sludge reduction rate can reach 25%.
The foregoing is a detailed description of the invention for the purpose of facilitating a person skilled in the art to better understand and apply the invention, but the invention is not limited thereto, so that simple modifications made by a person skilled in the art are within the scope of the invention.
Claims (2)
1. Device of short distance nitration/anaerobic ammonium oxidation-fermentation coupling short distance denitrification/anaerobic ammonium oxidation treatment sludge digestion liquid, its characterized in that includes: the system comprises a raw water tank (1), a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2), an intermediate water tank (3), a sludge storage tank (4) and a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5);
the raw water tank (1) is provided with a water outlet (1.1); the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is provided with a first water inlet pump (2.1), a water inlet (2.2), an aeration pump (2.3), a gas flowmeter (2.4), a pH/DO real-time monitoring device (2.5), a pH probe (2.6), a DO probe (2.7), a stirrer (2.8), an aeration disc (2.9), a water outlet (2.10), a drain valve (2.11), a sludge discharge port (2.12), a sludge discharge valve (2.13) and a filler frame (2.14); the middle water tank (3) is provided with a middle water tank water inlet (3.1) and a middle water tank water outlet (3.2); the mud storage box (4) is provided with a mud inlet (4.1) and a mud outlet (4.2); the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is provided with a gas collecting device (5.1), a second water inlet pump (5.2), a sludge inlet pump (5.3), a three-phase separator (5.4), a sampling port (5.5), an emptying valve (5.6), a water outlet pipe (5.7) and a reflux pump (5.8);
a water outlet (1.1) of a raw water tank (1) is connected with a water inlet (2.2) of a short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through a first water inlet pump (2.1), air is pumped into the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) through an aeration pump (2.3), a gas flowmeter (2.4) and an aeration disc (2.9) in sequence, and the pH value and the DO value of the air are monitored through a pH/DO real-time monitoring device (2.5); a water outlet (2.10) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a drain valve (2.11); a sludge discharge port (2.12) of the short-cut nitrification/anaerobic ammonia oxidation SBR reactor (2) is connected with a water inlet (3.1) of the middle water tank (3) through a sludge discharge valve (2.13); a water outlet (3.2) of the intermediate water tank (3) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a second water inlet pump (5.2); a sludge outlet of the sludge storage tank (4) is connected with the bottom of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) through a sludge inlet pump (5.3); the effluent of the fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor (5) is discharged through a water outlet pipe (5.7).
2. Method for applying the device according to claim 1, comprising the steps of:
1) startup of system
(1) Starting a short-cut nitrification/anaerobic ammonia oxidation SBR reactor: the inoculated sludge of the SBR reactor is short-cut nitrification activated sludge, the concentration of the inoculated sludge is controlled to be 3000-5000mg/L, and the sludge age is controlled to be 25-30d through sludge discharge; controlling COD concentration in a raw water tank to be 120-200mg/L and ammonia nitrogen concentration to be 200-400mg/L, controlling aeration stirring DO to be maintained at 1-1.5mg/L through a DO real-time monitoring device, setting the drainage ratio of the reactor to be 0.5-0.7, and operating for 4-6 periods every day, wherein each period comprises water inlet, aeration stirring, sedimentation, drainage and idling; running the reactor under the conditions, and realizing partial short-cut nitrification when the mass concentration ratio of ammonia nitrogen to nitrite nitrogen in the effluent is 1-1.32 and lasts for more than 15 days; then inoculating a fixed filler attached with anaerobic ammonium oxidation bacteria into the SBR reactor, wherein the volume of the fixed filler accounts for 25-30% of the effective volume of the reactor, controlling the DO of an aerobic section to be 1-1.5mg/L through a DO real-time monitoring device, controlling the water discharge ratio of the reactor to be 0.5-0.7, operating for 3-4 periods each day, wherein each period comprises water inlet, anoxic stirring, aerobic stirring, anoxic stirring, sedimentation, water discharge and idling, operating the reactor under the conditions, and when the concentrations of ammonia nitrogen and nitrite nitrogen in the outlet water are all less than 1mg/L and stably operating for more than 15 days, considering that the short-cut nitrification/anaerobic ammonium oxidation SBR reactor is successfully started;
(2) starting a fermentation coupling short-cut denitrification/anaerobic ammonia oxidation UASB reactor: inoculating anaerobic ammonia oxidation granular sludge into a UASB reactor, wherein the concentration of the inoculated sludge is 3000-4000mg/L, the retention time of the UASB reactor is 3-5h, the sludge age is 20-25d, the inflow water adopts artificial water distribution with the mass ratio of nitrite nitrogen to ammonia nitrogen being 1.3, the concentration of TN is 20-30mg/L, and when the total nitrogen removal rate reaches more than 90% and continuously maintains for more than 15 days, the acclimation of anaerobic ammonia oxidation bacteria in the UASB reactor is completed; then inoculating short-range denitrification activated sludge into a UASB reactor, controlling the sludge concentration in the reactor after inoculation to be 7000-8000mg/L, adopting artificial water distribution containing ammonia nitrogen, nitrate nitrogen and sodium acetate for inlet water, controlling the mass ratio of the nitrate nitrogen to the ammonia nitrogen in the inlet water to be 1.5, controlling the total nitrogen concentration to be 20-40mg/L and the SCOD concentration to be 40-80mg/L, and completing the coupling of anaerobic ammonia oxidation and short-range denitrification in the UASB reactor when the total nitrogen removal rate of system outlet water reaches more than 85% and continuously maintains for more than 15 days; finally, replacing sodium acetate with a carbon source generated by hydrolysis and acidification of the residual sludge to serve as a denitrification carbon source to maintain the concentration of SCOD at 40-80mg/L, and when the total nitrogen removal rate reaches over 85% and is continuously maintained for 15 days, considering that the fermentation-coupled short-cut denitrification/anaerobic ammonia oxidation UASB reactor is successfully started;
2) operation of the System
(1) Opening a first water inlet pump, pumping sludge digestion liquid in a raw water tank into an SBR reactor, wherein the reactor operates in an A/O/A (anaerobic/aerobic/anoxic) mode, after water is fed, a stirrer in a pre-anoxic-section shortcut nitrification/anaerobic ammonia oxidation reactor is started, anoxic stirring is carried out for 30min, and residual nitrate nitrogen in the last period is removed by using denitrification of organic matters in raw water; after the pre-anoxic section is finished, an aeration pump is started to aerate the shortcut nitrification/anaerobic ammonia oxidation reactor, ammonia nitrogen in raw water is partially converted into nitrite nitrogen, DO is controlled to be 1-1.5mg/L by adjusting a gas flow meter, pH and DO values are monitored by a pH/DO online monitoring device, aerobic stirring time is 120-plus-material 180min, after the aeration is finished, an aeration pump in the shortcut nitrification/anaerobic ammonia oxidation SBR reactor is closed, anoxic stirring is carried out for 180min, anaerobic ammonia oxidation on a biological membrane utilizes residual ammonia nitrogen and nitrite nitrogen to carry out autotrophic denitrification, then sedimentation is carried out for 30min to separate sludge and water, a first drainage valve is opened, drainage enters an intermediate water tank, the drainage ratio is 70%, the operation is carried out for 3 periods every day, and the rest time is idle;
(2) opening a second water inlet pump, pumping the sewage in the middle water tank into the UASB reactor, simultaneously pumping the residual sludge in the sludge storage tank into the UASB reactor through a sludge inlet pump, controlling the sludge concentration in the UASB reactor to be 7000 plus materials 8000mg/L, controlling the hydraulic retention time to be 3-5h, the sludge age to be 20-25d, and controlling the internal circulation reflux ratio to be 100 plus materials to be 120%; and the effluent and sludge of the UASB reactor are discharged through a water outlet pipe and an emptying valve.
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