CN113184995B - High-nitrogen wastewater synchronous nitrification-autotrophic denitrification nitrogen removal method based on multi-source electron donor and reactor - Google Patents
High-nitrogen wastewater synchronous nitrification-autotrophic denitrification nitrogen removal method based on multi-source electron donor and reactor Download PDFInfo
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Abstract
The invention discloses a synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on a multi-source electron donor and a reactor. The denitrification method comprises the following steps: adding sodium thiosulfate into the high-nitrogen wastewater, then sequentially entering a three-stage synchronous nitrification-autotrophic denitrification reactor, and suspending siderite (FeCO) in the reactor 3 ) Pyrite (FeS) 2 ) And iron shavings (Fe) 0 ) The composite filler is subjected to synchronous nitrification-autotrophic denitrification under the aeration and oxygenation conditions, so that the total nitrogen in the wastewater is efficiently removed, and the treated water enters a sedimentation tank for sedimentation and is discharged. Compared with the traditional nitrification and denitrification (AO) denitrification, the high-nitrogen wastewater synchronous nitrification-autotrophic denitrification method and the reactor based on the multi-source electron donor do not need to add an organic carbon source and nitrify liquid reflux, and the operation cost is greatly reduced.
Description
Technical Field
The invention relates to a high-nitrogen wastewater synchronous nitrification-autotrophic denitrification nitrogen removal method based on a multi-source electron donor and a reactor, belonging to the technical field of sewage and wastewater nitrogen removal.
Background
High-nitrogen wastewater is generated in industrial and agricultural production such as printing, breeding and the like in the processes of refuse landfill, fermentation and printing and dyeing. The treatment method of the high-nitrogen wastewater is generally nitrification and denitrification combined (AO). However, because the C/N of the wastewater is low, a large amount of carbon sources need to be added in the denitrification process. Meanwhile, in order to obtain higher total nitrogen removal rate, the denitrification efficiency is improved by adopting multi-stage AO and setting a high reflux ratio of the nitrifying liquid in the actual engineering, and the treatment cost is higher.
In order to solve the problems of large demand of denitrification carbon source and high treatment cost of high-nitrogen wastewater, in recent years, research on autotrophic denitrification technology using inorganic substances as electron donors is developed. The low-valent sulfur replaces an additional organic carbon source to form autotrophy and polyculture denitrification, and the effects of enhanced denitrification and carbon source saving are obvious; for example: the magnetic pyrite with the nano structure is prepared by calcining natural pyrite, and is applied to the autotrophic denitrification biological filter for treating actual secondary biochemical effluent, so that the high removal rate of the total nitrogen can be obtained under the condition of low C/N ratio. The low-valent iron may also serve as an autotrophic or a mixotrophic denitrification electron donor, for example: fe-based on activated sludge inoculation 2+ The oxidation autotrophic denitrification reactor can obtain stable NO in a running period of 3 months 3- N removal rate, successful Fe enrichment in the system 2+ Oxidizing bacteria and nitrate reducing bacteria. As sulfur autotrophic denitrification produces acid and iron autotrophic denitrification produces alkali, sulfur and iron in cooperation with autotrophic or mixotrophic denitrification can balance and buffer the pH value of a denitrification system and carry out nitrogen treatment on N 2 And the emission reduction of the greenhouse gas O is obviously contributed.
In order to solve the problems of high carbon source consumption and high reflux ratio of the high-nitrogen wastewater, the invention provides a synchronous nitrification-autotrophic denitrification nitrogen removal method and a reactor for the high-nitrogen wastewater based on a multi-source electron donor based on the principles of sulfur and iron coordinated autotrophic denitrification and synchronous nitrification denitrification, which can realize high-efficiency nitrogen removal without an external carbon source and nitrification liquid reflux for the high-nitrogen wastewater and can greatly reduce the operation cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the denitrification of the high-nitrogen wastewater has the problems of high carbon source consumption, high reflux ratio and the like.
In order to solve the technical problems, the invention provides a synchronous nitrification-autotrophic denitrification method for high-nitrogen wastewater based on a multi-source electron donor, which comprises the following steps:
step 1): adding sodium thiosulfate into high-nitrogen wastewater with TN not less than 1000mg/L, introducing into a primary synchronous nitrification-autotrophic denitrification reactor, and suspending siderite FeCO in the reactor 3 FeS, pyrite 2 And iron shavings Fe 0 The composite filler forms a multi-source electron donor, and the synchronous nitrification-autotrophic denitrification effect is generated under the aeration and oxygenation conditions, so that the total nitrogen in the wastewater is partially removed;
step 2): the wastewater treated by the step 1) enters a secondary synchronous nitrification-autotrophic denitrification reactor, and siderite FeCO is also hung in the reactor 3 Pyrite FeS 2 And iron shavings Fe 0 The filling amount of the formed composite filler is lower than that of the composite filler in the primary synchronous nitrification-autotrophic denitrification reactor, and synchronous nitrification-autotrophic denitrification is performed under the aeration and oxygenation conditions to further reduce the total nitrogen in the wastewater;
step 3): the wastewater treated in the step 2) enters a three-stage synchronous nitrification-autotrophic denitrification reactor, and siderite (FeCO) is hung in the reactor 3 ) And iron shavings (Fe) 0 ) The composite filler is subjected to synchronous nitrification-autotrophic denitrification in a three-stage reactor under the condition of aeration and oxygenation, so that the total nitrogen in the wastewater is reduced to a lower level;
step 4): and (3) performing solid-liquid separation on the wastewater subjected to the denitrification treatment in the step 3), returning partial residual sludge to the primary synchronous nitrification-autotrophic denitrification reactor, wherein the reflux ratio is 50-100%, mixing the residual sludge with the inlet water of the primary synchronous nitrification-autotrophic denitrification reactor, and then feeding the mixture into the primary synchronous nitrification-autotrophic denitrification reactor to supplement the sludge lost in the reactor, and discharging partial residual sludge for further treatment.
Preferably, the dosage of the sodium thiosulfate in the step 1) is controlled to be 0.6 to 0.8 of S/N molar ratio; the reaction retention time is controlled to be 20-24 h, and the gas-water ratio in the aeration oxygenation condition is controlled to be 8-10: 1..
Preferably, the composite filler in the step 1) comprises the following components in parts by weight: pyrite: iron shavings =1:2:3, the composite filler is wrapped by a polyethylene mesh bag and then hung in the reactor, the weight of the wrapped single-package filler is 10-12 kg, and the filling amount of the composite filler in the primary synchronous nitrification-autotrophic denitrification reactor is 30-40 kg/m 3 。
Preferably, the reaction residence time of the step 2) is controlled to be 16-20 h; the air-water ratio in the aeration oxygenation condition is controlled to be 6-8: 1.
preferably, the weight ratio of the composite filler, the weight of the single-package filler, the packaging and installation mode of the composite filler in the step 2) are the same as those of the primary synchronous nitrification-autotrophic denitrification reactor, but the filling amount of the composite filler is 2/3 of that of the primary synchronous nitrification-autotrophic denitrification reactor.
Preferably, the reaction residence time of the step 3) is controlled to be 12-14 h; the air-water ratio in the aeration oxygenation condition is controlled to be 4-6: 1.
preferably, the composite filler in the step 3) comprises the following components in parts by weight: iron shavings =1:2, the composite filler material is wrapped by polyethylene mesh bags and then made into string packages to be hung in the reactor, the weight of the wrapped single-package filler is 10-12 kg, and the filling amount of the composite filler in the three-stage synchronous nitrification-autotrophic denitrification reactor is 40-50 kg/m 3 。
Preferably, the sludge reflux ratio in the step 4) is controlled to be 50-100%.
The invention also provides a high-nitrogen wastewater synchronous nitrification-autotrophic denitrification reactor based on the multi-source electron donor, which is applied to the denitrification method of the high-nitrogen wastewater synchronous nitrification-autotrophic denitrification based on the multi-source electron donor, and comprises the following steps:
the device comprises a primary synchronous nitrification-autotrophic denitrification reactor (5) provided with a composite filler I (4), wherein a water inlet pipe (1) connected with a sulfur source electron donor feeding pipe (2) is arranged on the water inlet side of the primary synchronous nitrification-autotrophic denitrification reactor (5), a first water outlet pipe (8) is arranged on the water outlet side, and a first aeration pipe (7) is arranged at the bottom of the primary synchronous nitrification-autotrophic denitrification reactor;
a second-stage synchronous nitrification-autotrophic denitrification reactor (11) provided with a second composite filler (10), wherein the water inlet side of the second-stage synchronous nitrification-autotrophic denitrification reactor (11) is connected with a first water outlet pipe (8), the water outlet side is provided with a second water outlet pipe (14), and the bottom of the second-stage synchronous nitrification-autotrophic denitrification reactor is provided with a second aeration pipe (13);
a third-stage synchronous nitrification-autotrophic denitrification reactor (17) provided with a third composite filler (16), wherein the water inlet side of the third-stage synchronous nitrification-autotrophic denitrification reactor (17) is connected with a second water outlet pipe (14), the water outlet side is provided with a third water outlet pipe (20), and the bottom of the third-stage synchronous nitrification-autotrophic denitrification reactor is provided with a third aeration pipe (19);
the bottom of the sedimentation tank is provided with a sludge discharge pipe (23) and a sedimentation tank (21) of a sludge return pipe (24), the water inlet side of the sedimentation tank (21) is connected with a third water outlet pipe (20), and the water outlet side is provided with a fourth water outlet pipe (22).
Preferably, a first water distribution channel 3, a second water distribution channel 9 and a third water distribution channel 15 are respectively arranged on the water inlet side of the first-stage, second-stage and third-stage synchronous nitrification-autotrophic denitrification reactors, and a first water collecting channel 6, a second water collecting channel 12 and a third water collecting channel 18 are respectively arranged on the water outlet side of the first-stage, second-stage and third-stage synchronous nitrification-autotrophic denitrification reactors.
The principle of the invention is as follows: aiming at the problems that a large amount of carbon sources are required to be added for denitrification and denitrification, the operation cost is high and the denitrification efficiency is low due to low C/N of high-nitrogen wastewater, synchronous nitrification-autotrophic denitrification is realized in a three-stage aerobic process by adopting a sulfur-iron multi-source electron donor, and the problems that a large amount of carbon sources are added for conventional nitrification and denitrification and the reflux ratio of nitrifying liquid is high can be solved.
The application range of the invention is as follows: printing and dyeing in the processes of refuse landfill, fermentation and printing and dyeingHigh-nitrogen wastewater (TN, NH) generated in industrial and agricultural production such as cultivation 4 + -N is more than or equal to 1000 mg/L). By the synchronous nitrification-autotrophic denitrification nitrogen removal method and the reactor for the high-nitrogen wastewater based on the multi-source electron donor, the TN of the effluent can be stably lower than 100mg/L.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional nitrification and denitrification (AO) denitrification, the high-nitrogen wastewater synchronous nitrification-autotrophic denitrification method and the reactor based on the multi-source electron donor do not need additional organic carbon source and nitrification liquid reflux, have high denitrification efficiency and low operation cost;
2. by the multi-source electron donor synchronous nitrification-autotrophic denitrification nitrogen removal method and the reactor for the high-nitrogen wastewater based on the multi-source electron donor, the TN of the high-nitrogen wastewater effluent can be stably lower than 100mg/L.
Drawings
FIG. 1 is a schematic diagram of a synchronous nitrification-autotrophic denitrification reactor for high-nitrogen wastewater based on multi-source electron donors, provided by the invention;
reference numerals: 1. a water inlet pipe; 2. a sulfur source electron donor feeding pipe; 3. a first water distribution channel; 4. a first composite filler; 5. a primary synchronous nitrification-autotrophic denitrification reactor; 6. a first catchment channel; 7. a first aerator pipe; 8. a first water outlet pipe; 9. a second water distribution channel; 10. a second composite filler; 11. a secondary synchronous nitrification-autotrophic denitrification reactor; 12. a second catchment channel; 13. a second aerator pipe; 14. a second water outlet pipe; 15. a third water distribution channel; 16. a third composite filler; 17. a third-stage synchronous nitrification-autotrophic denitrification reactor; 18. a third water collection channel; 19. a third aeration pipe; 20. a third water outlet pipe; 21. a sedimentation tank; 22. a fourth water outlet pipe; 23. a sludge discharge pipe; 24. a sludge return pipe.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a high-nitrogen wastewater synchronous nitrification-autotrophic denitrification nitrogen removal method and a reactor based on a multi-source electron donorIn the embodiment, the raw wastewater comes from aged leachate of a certain refuse landfill, and the water quality indexes are as follows: COD = 4000-5000 mg/L, TN = 3000-4000 mg/L, NH 4 + -N = 2800-4000 mg/L, nitrogen being predominantly NH 4 + -the N form is present. In order to solve the problem of denitrification of high-nitrogen and low-C/N old landfill leachate, a synchronous nitrification-autotrophic denitrification method for high-nitrogen wastewater based on a multi-source electron donor is adopted, and the method comprises the following steps:
step 1): adding sodium thiosulfate into the aged percolate, introducing into a primary synchronous nitrification-autotrophic denitrification reactor, and suspending siderite (FeCO) in the reactor 3 ) Pyrite (FeS) 2 ) And iron shavings (Fe) 0 ) The composite filler is subjected to synchronous nitrification-autotrophic denitrification under the aeration and oxygenation conditions, so that the total nitrogen in the wastewater is partially removed.
Step 2): the aged percolate treated in the step 1) enters a secondary synchronous nitrification-autotrophic denitrification reactor, and siderite (FeCO) is hung in the reactor 3 ) Pyrite (FeS) 2 ) And iron shavings (Fe) 0 ) The filling amount of the composite filler is lower than that of the first-stage reactor, and the composite filler has synchronous nitrification-autotrophic denitrification effect under the aeration and oxygenation conditions in the second-stage reactor, so that the total nitrogen in the wastewater is further reduced.
Step 3): the aged percolate treated by the step 2) enters a three-stage synchronous nitrification-denitrification reactor, and siderite (FeCO) is hung in the reactor 3 ) And iron shavings (Fe) 0 ) The composite filler is subjected to synchronous nitrification-autotrophic denitrification in a three-stage reactor under the aeration and oxygenation conditions, so that the total nitrogen in the wastewater is reduced to a lower level.
And step 4): and (3) performing solid-liquid separation on the aged leachate after denitrification treatment in the step 3) in a sedimentation tank, refluxing partial residual sludge to a primary reactor, mixing the residual sludge with the primary reactor inlet water, and then feeding the mixture into a primary reaction tank to supplement the sludge lost in the reaction tank, wherein partial residual sludge is discharged and then further treated.
Wherein the dosage of the sodium thiosulfate in the step 1) is controlled to be 0.6 to 0.8 of S/N molar ratio. The reaction residence time is controlled to be 20-24 h; composition of composite fillerThe weight ratio of the siderite (FeCO) 3 ): pyrite (FeS) 2 ): iron shavings (Fe) 0 ) =1:2:3, the weight of the single-package filler is 10-12 kg, and the single-package filler is wrapped by a polyethylene mesh bag. The filler bags are made into serial packages and hung in the reaction tank, and the filling amount of the filler is 30-40 kg/m 3 (ii) a The gas-water ratio in aeration oxygenation is 8-10: 1.
wherein the reaction residence time of the step 2) is controlled to be 16-20 h; the weight proportion of the composite filler, the weight of the single-package filler and the packaging and installation modes are the same as those of a first-stage reactor, but the filling amount of the filler is 2/3 of that of the first-stage reactor; the gas-water ratio in aeration oxygenation is 6-8: 1.
wherein, the reaction residence time in the step 3) is controlled to be 12 to 14 hours; the composite filler comprises siderite (FeCO) 3 ): iron shavings (Fe) 0 ) =1:2, the weight of the single-package filler is 10-12 kg, the single-package filler is wrapped by a polyethylene mesh bag, the filler packages are made into series and hung in the reaction tank, and the filling amount of the filler is 40-50 kg/m 3 (ii) a The gas-water ratio in aeration oxygenation is 4-6: 1.
wherein the sludge reflux ratio in the step 4) is controlled to be 50-100%.
The denitrification method adopts a high-nitrogen wastewater synchronous nitrification-autotrophic denitrification reactor based on a multi-source electron donor as shown in figure 1, and comprises the following steps:
the primary synchronous nitrification-autotrophic denitrification reactor 5 is provided with a composite filler I4, the water inlet side of the primary synchronous nitrification-autotrophic denitrification reactor 5 is provided with a water inlet pipe 1 connected with a sulfur source electron donor adding pipe 2, the water outlet side is provided with a first water outlet pipe 8, and the bottom is provided with a first aeration pipe 7;
the two-stage synchronous nitrification-autotrophic denitrification reactor 11 is provided with a composite filler II 10, the water inlet side of the two-stage synchronous nitrification-autotrophic denitrification reactor 11 is connected with the first water outlet pipe 8, the water outlet side is provided with a second water outlet pipe 14, and the bottom of the two-stage synchronous nitrification-autotrophic denitrification reactor is provided with a second aeration pipe 13;
a third-stage synchronous nitrification-autotrophic denitrification reactor 17 provided with a third composite filler 16, wherein the water inlet side of the third-stage synchronous nitrification-autotrophic denitrification reactor 17 is connected with a second water outlet pipe 14, the water outlet side is provided with a third water outlet pipe 20, and the bottom of the third-stage synchronous nitrification-autotrophic denitrification reactor is provided with a third aeration pipe 19;
the bottom of the sedimentation tank 21 is provided with a sludge discharge pipe 23 and a sludge return pipe 24, the water inlet side of the sedimentation tank 21 is connected with a third water outlet pipe 20, and the water outlet side is provided with a fourth water outlet pipe 22;
the water inlet side of the first, second and third-stage synchronous nitrification-autotrophic denitrification reactor is respectively provided with a first water distribution channel 3, a second water distribution channel 9 and a third water distribution channel 15, and the water outlet side is respectively provided with a first water collecting channel 6, a second water collecting channel 12 and a third water collecting channel 18.
TN of the aged percolate treated by the denitrification method and the denitrification reactor is lower than 100mg/L.
The above-described embodiments are intended to be preferred embodiments of the present invention only, and not to limit the invention in any way and in any way, it being noted that those skilled in the art will be able to make modifications and additions without departing from the scope of the invention, which shall be deemed to also encompass the scope of the invention.
Claims (10)
1. A high-nitrogen wastewater synchronous nitrification-autotrophic denitrification denitrogenation method based on a multi-source electron donor is characterized by comprising the following steps:
step 1): adding sodium thiosulfate into high-nitrogen wastewater with TN more than or equal to 1000mg/L, introducing into a primary synchronous nitrification-autotrophic denitrification reactor, and suspending siderite FeCO in the reactor 3 FeS, pyrite 2 And iron shavings Fe 0 The composite filler forms a multi-source electron donor, and the synchronous nitrification-autotrophic denitrification effect is generated under the aeration and oxygenation conditions, so that the total nitrogen in the wastewater is partially removed;
step 2): the wastewater treated by the step 1) enters a secondary synchronous nitrification-autotrophic denitrification reactor, and siderite FeCO is also hung in the reactor 3 FeS, pyrite 2 And iron shavings Fe 0 The filling amount of the formed composite filler is lower than that of the composite filler in the primary synchronous nitrification-autotrophic denitrification reactor, and synchronous nitrification and denitrification also occur under the condition of aeration and oxygenationThe chemo-autotrophic denitrification effect further reduces the total nitrogen in the wastewater;
step 3): the wastewater treated in the step 2) enters a three-stage synchronous nitrification-autotrophic denitrification reactor, and siderite FeCO is hung in the reactor 3 And iron shavings Fe 0 The composite filler is subjected to synchronous nitrification-autotrophic denitrification in a three-stage reactor under the condition of aeration and oxygenation, so that the total nitrogen in the wastewater is reduced to a lower level;
step 4): and (4) performing solid-liquid separation on the wastewater subjected to the denitrification treatment in the step 3) in a sedimentation tank, refluxing part of residual sludge to the primary synchronous nitrification-autotrophic denitrification reactor, mixing the residual sludge with the inlet water of the primary synchronous nitrification-autotrophic denitrification reactor, and then feeding the mixed residual sludge into the primary synchronous nitrification-autotrophic denitrification reactor to supplement the sludge lost in the reactor, and discharging part of the residual sludge for further treatment.
2. The synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the dosage of sodium thiosulfate in the step 1) is controlled to be 0.6-0.8 of S/N molar ratio; the reaction residence time is controlled to be 20-24 h; the air-water ratio in the aeration oxygenation condition is controlled to be 8-10: 1.
3. the synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the composite filler in the step 1) comprises the following components in parts by weight: pyrite: iron shavings =1:2:3, the composite filler is wrapped by a polyethylene mesh bag and then hung in the reactor, the weight of the wrapped single-package filler is 10-12 kg, and the filling amount of the composite filler in the primary synchronous nitrification-autotrophic denitrification reactor is 30-40 kg/m 3 。
4. The synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the reaction residence time of the step 2) is controlled to be 16-20 h; the air-water ratio in the aeration oxygenation condition is controlled to be 6-8: 1.
5. the method for simultaneous nitrification-autotrophic denitrification of nitrogen removal from high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the composite filler of step 2) has the same composition weight ratio, weight of single-package filler, packaging and installation manner as the primary simultaneous nitrification-autotrophic denitrification reactor, but the filling amount of the composite filler is 2/3 of that of the primary simultaneous nitrification-autotrophic denitrification reactor.
6. The synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the reaction residence time of the step 3) is controlled to be 12-14 h; the gas-water ratio in the aeration oxygenation condition is controlled to be 4-6: 1.
7. the synchronous nitrification-autotrophic denitrification nitrogen removal method for high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the composite filler of the step 3) comprises the following components in parts by weight: iron shavings =1:2, the composite filler material is wrapped by polyethylene mesh bags and then made into string packages to be hung in the reactor, the weight of the wrapped single-package filler is 10-12 kg, and the filling amount of the composite filler in the three-stage synchronous nitrification-autotrophic denitrification reactor is 40-50 kg/m 3 。
8. The method for simultaneous nitrification-autotrophic denitrification of nitrogen removal from high-nitrogen wastewater based on multi-source electron donors according to claim 1, wherein the sludge reflux ratio in step 4) is controlled to be 50% to 100%.
9. A synchronous nitrification-autotrophic denitrification reactor for high-nitrogen wastewater based on multi-source electron donors, which is applied to the denitrification method for synchronous nitrification-autotrophic denitrification of high-nitrogen wastewater based on multi-source electron donors in any one of claims 1 to 8, comprising:
the device comprises a primary synchronous nitrification-autotrophic denitrification reactor (5) provided with a composite filler I (4), wherein a water inlet pipe (1) connected with a sulfur source electron donor feeding pipe (2) is arranged on the water inlet side of the primary synchronous nitrification-autotrophic denitrification reactor (5), a first water outlet pipe (8) is arranged on the water outlet side, and a first aeration pipe (7) is arranged at the bottom of the primary synchronous nitrification-autotrophic denitrification reactor;
a second-stage synchronous nitrification-autotrophic denitrification reactor (11) provided with a second composite filler (10), wherein the water inlet side of the second-stage synchronous nitrification-autotrophic denitrification reactor (11) is connected with a first water outlet pipe (8), the water outlet side is provided with a second water outlet pipe (14), and the bottom of the second-stage synchronous nitrification-autotrophic denitrification reactor is provided with a second aeration pipe (13);
a three-stage synchronous nitrification-autotrophic denitrification reactor (17) provided with a composite filler III (16), wherein the water inlet side of the three-stage synchronous nitrification-autotrophic denitrification reactor (17) is connected with a second water outlet pipe (14), the water outlet side is provided with a third water outlet pipe (20), and the bottom of the three-stage synchronous nitrification-autotrophic denitrification reactor is provided with a third aeration pipe (19);
the bottom of the sedimentation tank is provided with a sludge discharge pipe (23) and a sedimentation tank (21) of a sludge return pipe (24), the water inlet side of the sedimentation tank (21) is connected with a third water outlet pipe (20), and the water outlet side is provided with a fourth water outlet pipe (22).
10. The multi-source electron donor-based synchronous nitrification-autotrophic denitrification and denitrification reactor for high-nitrogen wastewater according to claim 9, wherein the first, second and third stages of synchronous nitrification-autotrophic denitrification reactors are respectively provided with a first water distribution channel 3, a second water distribution channel 9 and a third water distribution channel 15 on water inlet sides thereof, and respectively provided with a first water collection channel 6, a second water collection channel 12 and a third water collection channel 18 on water outlet sides thereof.
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