CN216141333U - Carbon source adding optimization control system of AOA + MABR coupling process - Google Patents

Carbon source adding optimization control system of AOA + MABR coupling process Download PDF

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CN216141333U
CN216141333U CN202120540439.9U CN202120540439U CN216141333U CN 216141333 U CN216141333 U CN 216141333U CN 202120540439 U CN202120540439 U CN 202120540439U CN 216141333 U CN216141333 U CN 216141333U
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郑琬琳
于弢
薛晓飞
李凌云
穆永杰
张丽丽
曹天宇
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Beijing Enterprises Water China Investment Co Ltd
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Abstract

The utility model discloses a carbon source adding optimization control system of an AOA + MABR coupling process, wherein an MABR membrane component is arranged between an aerobic pool and an anoxic pool of the AOA process and comprises an online monitoring system, an internal carbon source adding system, an external carbon source adding system, a sludge external reflux system and a carbon source adding PLC control system. The MABR tank is coupled on the basis of the original AOA process, and the optimized utilization of the internal carbon source is realized by adopting a mode of supplying the internal carbon source in sections; because the MABR membrane component can realize the effect of synchronous nitrification and denitrification, the occupied areas of the aerobic tank and the anoxic tank are reduced; the optimal adding amount of the internal carbon source and the external carbon source is respectively provided for the MABR tank and the anoxic tank, so that the denitrification effect of the biochemical tank can be optimized; the internal carbon source and the external carbon source are controlled in a combined optimization mode, and the material consumption cost of the external carbon source of the sewage plant is reduced through simple and easy operation.

Description

Carbon source adding optimization control system of AOA + MABR coupling process
Technical Field
The utility model belongs to the field of sewage treatment technology and material consumption reduction control, and particularly relates to a carbon source adding optimization control system for an AOA + MABR coupling process.
Background
The AOA process (anaerobic-aerobic-anoxic process) is based on the traditional AAO process, the anoxic tank is placed in the aerobic tank after the anoxic tank, the return of nitrifying liquid is cancelled, and simultaneously, the sludge in the secondary sedimentation tank is subjected to double return, namely, the sludge is returned to the anaerobic zone to be used as the external return of the sludge; and (4) returning to the anoxic zone, and using an internal carbon source generated by sludge fermentation of the secondary sedimentation tank as a denitrification carbon source. The MABR (Membrane Aerated Biofilm Reactor) process directly conveys oxygen to a Biofilm in a bubble-free aeration mode, so that the oxygen utilization rate is improved, and a synchronous nitrification and denitrification process can be realized. The MABR is arranged between an aerobic pool and an anoxic pool of the AOA process for process coupling, and the sludge in the secondary sedimentation pool flows back to the anaerobic pool, the MABR pool and the anoxic pool, so that the volume of the aerobic pool can be reduced, and the utilization efficiency of carbon sources and the utilization efficiency of oxygen can be further improved. However, the C/N ratio of inlet water of many sewage treatment plants is generally low at present, the carbon source is insufficient, and the denitrification requirement can not be met only by the inner carbon source, so that the outer carbon source needs to be added. However, how to control the balanced utilization between the internal carbon source and the external carbon source in the AOA + MABR coupled process system is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a carbon source adding optimization control system for an AOA + MABR coupling process. Aiming at the possibility that the carbon source cannot meet the requirement of denitrification in the AOA sludge double-reflux process because the C/N ratio of inlet water of a sewage treatment plant is low, an MABR process is coupled between an aerobic tank and an anoxic tank of the AOA process, so that synchronous nitrification and denitrification are realized, and the utilization rate of the carbon source is improved. In order to more effectively utilize the internal carbon source of the sewage treatment system and reduce the adding amount of the external carbon source, the utility model aims to optimize the internal carbon source utilization and external carbon source adding system of the sewage treatment process, realize the optimization of the internal carbon source utilization and the reduction of the carbon source adding, and further reduce the carbon footprint of the sewage treatment plant.
The purpose of the utility model is realized by the following technical scheme:
a carbon source adding optimization control system of an AOA + MABR coupling process is characterized in that an MABR membrane component is arranged between an aerobic pool and an anoxic pool of the AOA process and comprises an online monitoring system, an inner carbon source adding system, an outer carbon source adding system, a sludge outer reflux system and a carbon source adding PLC control system.
The on-line monitoring system comprises a flow measuring instrument, a COD analyzer, a total nitrogen analyzer and NO3-N analyzer and sludge concentration analyzer. Wherein, the water inlet end of the biochemical pool is provided with a water inlet flow measuring instrument, a COD analyzer and a total nitrogen analyzer; the front end of the MABR tank is provided with a COD analyzer and NO3An N analyzer, wherein a sludge concentration analyzer is arranged in the middle section; the front end of the anoxic pond is provided with a COD analyzer and NO3-N analyzer, end disposed COD analyzer and NO3-an N analyzer. And the instruments of the on-line monitoring system are electrically connected with the carbon source adding PLC system.
The internal carbon source adding system comprises a sludge reflux pump, an internal carbon source sludge reflux pipeline, a flowmeter and an automatic control valve. Wherein, the internal carbon source sludge return pipeline penetrates out of the bottom of the secondary sedimentation tank and respectively reaches the front end of the MABR tank and the front end of the anoxic tank; and a second sludge reflux pump (namely an internal carbon source feeding pump) is arranged on the internal carbon source sludge reflux pipeline, and a set of flow meter and an automatic control valve are respectively arranged on the internal carbon source sludge reflux pipelines which reflux to the MABR tank and the anoxic tank. The on-line monitoring systems of the biochemical pond water inlet, the MABR pond and the anoxic pond are connected with a carbon source adding PLC control system, and the second sludge reflux pump, the flowmeter and the automatic control valve are all connected with the carbon source adding PLC control system.
The external carbon source adding system comprises an external carbon source storage tank, an external carbon source adding pipeline, an external carbon source adding pump, a flowmeter and an automatic control valve. Wherein, an external carbon source adding pipeline respectively extends from an external carbon source storage tank to the front end of the MABR tank and the front end of the anoxic tank, and an external carbon source adding pump, a flow meter and an automatic control valve are respectively arranged on the branches of the two pipelines. The on-line monitoring systems of the biochemical pond water inlet, the MABR pond and the anoxic pond are connected with a carbon source adding PLC control system, and an external carbon source adding pump, a flow meter and an automatic control valve on an external carbon source adding pipeline are all connected with the carbon source adding PLC control system.
The sludge external reflux system comprises a sludge external reflux pipeline, a first sludge reflux pump, a flowmeter and an automatic control valve. Wherein, the external return pipeline is arranged on the pipeline from the bottom of the secondary sedimentation tank to the front end of the anaerobic tank, and a first sludge return pump, a flowmeter and an automatic control valve are arranged on the pipeline and are connected with a carbon source adding PLC control system.
The inner carbon source feeding pump, the outer carbon source feeding pump and the sludge reflux pump all adopt variable frequency pumps and are provided with frequency converters.
The utility model also provides a carbon source adding optimization control method of the AOA + MABR coupling process, which is characterized by comprising the following steps:
and calculating the C/N ratio by adopting the online monitoring data of the biochemical tank water inlet COD analyzer and the TN analyzer to be used as a feedforward parameter. When the C/N of the inlet water is more than or equal to 5, only starting the inner carbon source adding system; and when the C/N of the inlet water is less than 5, simultaneously starting the inner carbon source adding system and the outer carbon source adding system to carry out combined adding control.
1. Optimal control method for adding internal carbon source
Adopts a biochemical pool inflow water flow measuring instrument, an MABR pool and anoxic pool front end COD analyzer and NO3-N analyzer, flowmeter on sludge external return pipeline and internal carbon source feeding pipeline, COD analyzer at tail end of anoxic tank and NO3in-N analyzer, MABR tank middle section sludge concentration analyzerAnd (3) line monitoring data, calculating the adding amount of the internal carbon source based on a carbon source adding amount prediction model, wherein the calculation formula is as follows:
Figure BDA0002977778160000031
Figure BDA0002977778160000032
in the formula (1), QMRSCMIThe adding amount of the internal carbon source of the MABR tank is mg COD/d, wherein QMRThe flow rate of the carbon source from the secondary sedimentation tank to the MABR tank is L/d; sNOMNO for the front end of MABR tank3Concentration of-N, mg NO3-N/L;SCMThe COD concentration at the front end of the MABR tank is mg COD/L; y isHThe yield coefficient of the sludge is mg COD/mg COD; qIThe water inlet flow of the biochemical pool is L/d; qSIs the return flow rate outside the sludge, L/d.
In the formula (2), QARSCAIThe dosage of the internal carbon source of the anoxic pond is mg COD/d, wherein QARThe flow rate of the carbon source from the secondary sedimentation tank to the anoxic tank is L/d; sNOAIs NO at the front end of the anoxic tank3Concentration of-N, mgNO3-N/L;SCAThe COD concentration at the front end of the anoxic tank is mg COD/L; y isHThe yield coefficient of the sludge is mg COD/mg COD.
Furthermore, online monitoring data of a sludge concentration analyzer at the middle section of the MABR tank are used as intermediate parameters, the sludge concentration is controlled within the range of 3000-4000 mg/L, and the adding amount of the internal carbon source is corrected and adjusted.
Further, a COD analyzer at the tail end of the anoxic pond and NO are adopted3And on-line monitoring data of the N analyzer is used as a feedback parameter to correct and adjust the adding amount of the internal carbon source.
And further, adjusting the frequency of the second sludge reflux pump and the opening of the automatic control valve by a carbon source adding PLC system according to the adjusted adding amount of the internal carbon source.
2. Optimization control method for combined feeding of internal carbon source and external carbon source
In order to reduce competition between the concentration of high suspended sludge in the MABR tank and the growth of microorganisms on a biological membrane and reduce the start and stop of an external carbon source feeding pump, when an internal and external carbon source combined feeding optimization control method is adopted, the MABR tank preferentially utilizes an external carbon source, and the anoxic tank preferentially utilizes an internal carbon source. And when the internal carbon source can not meet the denitrification requirement of the anoxic tank, starting the external carbon source feeding pump of the anoxic tank.
Adopts a biochemical pool inflow water flow measuring instrument, an MABR pool front end and anoxic pool front section COD analyzer and an NO3On-line monitoring data of an N analyzer and a sludge external reflux flow meter, and calculating the adding amount of the carbon source outside the MABR tank based on a carbon source adding amount prediction model, wherein the calculation formula is as follows:
Figure BDA0002977778160000041
in the formula (3), FECMThe adding amount of the external carbon source of the MABR tank is mg COD/d.
Figure BDA0002977778160000042
In the formula (4), FECAThe dosage of the external carbon source of the anoxic pond is mg COD/d.
Further, using anoxic pond end NO3And (4) taking the online monitoring data of the N analyzer as a feedback parameter to correct and adjust the adding amount of the internal and external carbon sources. When the water in the anoxic pond flows out NO3When the concentration of N is lower than 5mg/L, the internal carbon source meets the denitrification requirement, and the addition amount of the external carbon source is FECAAnd (4) zero, namely the carbon source adding pump outside the anoxic tank is not started. When the water in the anoxic pond flows out NO3And (4) starting a carbon source feeding pump outside the anoxic pond when the N concentration is higher than 10 mg/L.
Further, according to the adjusted adding amount of the inner and outer carbon sources, the starting, the stopping and the frequency of a second sludge reflux pump and the carbon source adding pump outside the anoxic pond are adjusted through a carbon source adding PLC system.
Compared with the prior art, the utility model has the advantages that: (1) the MABR tank is coupled on the basis of the original AOA process, and the optimized utilization of the internal carbon source is realized by adopting a mode of supplying the internal carbon source in sections; (2) because the MABR membrane component can realize the effect of synchronous nitrification and denitrification, the occupied areas of the aerobic tank and the anoxic tank are reduced; (3) the optimal adding amount of the internal carbon source and the external carbon source is respectively provided for the MABR tank and the anoxic tank, so that the denitrification effect of the biochemical tank can be optimized; (4) the internal carbon source and the external carbon source are controlled in a combined optimization mode, and the material consumption cost of the external carbon source of the sewage plant is reduced through simple and easy operation.
Drawings
FIG. 1 is a schematic diagram of a carbon source addition control system of an AOA + MABR coupling process according to an embodiment of the present invention.
In fig. 1: 1. a carbon source adding PLC control system, 2. an external carbon source storage tank, 3. an MABR tank external carbon source adding pump, 4. an MABR tank external carbon source adding flow meter, 5. an MABR tank external carbon source adding automatic control valve, 6. an anoxic tank external carbon source adding pump, 7. an anoxic tank external carbon source adding flow meter, 8. an anoxic tank external carbon source adding automatic control valve, 9. a first sludge reflux pump (external reflux pump), 10. a first sludge reflux flow meter, 11. a first sludge reflux automatic control valve, 12. a second sludge reflux pump (internal carbon source adding pump), 13. a second sludge reflux to MABR tank flow meter, 14. a second sludge reflux to MABR tank automatic control valve, 15. a second sludge reflux to anoxic tank flow meter, 16. a second sludge reflux to anoxic tank automatic control valve, 17. an residual sludge pump, 18. a biochemical tank water inflow measuring instrument, 19. an analyzer, a COD analyzer, a carbon dioxide (oxygen demand) analyzer, a carbon source adding flow meter, a carbon source adding device, a carbon source adding device, a, 20. Total nitrogen analyzer, 21.NO3An N analyzer, a 22 sludge concentration analyzer, 23 an inner carbon source feeding pipeline, 24 an outer carbon source feeding pipeline and 25 a sludge outer return pipeline.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples of the specification.
The embodiment provides a carbon source adding optimization control system and method for an AOA + MABR coupling process, and the applied process running conditions are as follows: the biochemical pool of a certain urban sewage treatment plant adopts the process of an anaerobic pool-an aerobic pool-an MABR pool-an anoxic pool, and the effluent quality meets the first-level standard A in the discharge Standard of pollutants for urban sewage treatment plants.
As shown in fig. 1, an AOA + MABR coupling process carbon source adding optimization control system comprises an anaerobic tank, an aerobic tank, an anoxic tank and a sedimentation tank which are sequentially connected, wherein an MABR tank is arranged between the aerobic tank and the anoxic tank, and is provided with an online monitoring system, and the online monitoring system comprises a biochemical tank, a water inlet end of which is provided with a flow measuring instrument (18), a COD analyzer (19) and a total nitrogen analyzer (20); the front end of the MABR tank is provided with a COD analyzer (19) and NO3-an N analyzer (21); a sludge concentration analyzer (22) is arranged in the middle section of the MABR tank; the front end and the tail end of the anoxic tank are respectively provided with a group of COD analyzers (19) and NO3-an N analyzer (21). The on-line monitoring system is electrically connected with the carbon source adding PLC control system (1).
A carbon source adding optimization control system of an AOA + MABR coupling process is characterized in that an MABR pool is provided with an internal carbon source adding system which comprises a second sludge reflux pump (12) and an internal carbon source adding pipeline (23); two lines of parallel pipelines are arranged on the inner carbon source adding pipeline (23), a carbon source adding flow meter (13) in the MABR tank and a carbon source adding automatic control valve (14) in the MABR tank are arranged on one line of pipelines on the inner carbon source adding pipeline (23), and a carbon source adding flow meter (15) in the anoxic tank and a carbon source adding automatic control valve (16) in the anoxic tank are arranged on the other line of pipelines on the inner carbon source adding pipeline (23). A second sludge reflux pump (12), an MABR tank carbon source adding flowmeter (13), an MABR tank carbon source adding automatic control valve (14), an anoxic tank carbon source adding flowmeter (15) and an anoxic tank carbon source adding automatic control valve (16) are electrically connected with a carbon source adding PLC control system (1). An inner carbon source feeding pipeline (23) is connected with the MABR tank and the anoxic tank.
A carbon source adding optimization control system of an AOA + MABR coupling process is characterized in that an MABR pool is provided with an external carbon source adding system, and the system comprises an external carbon source storage tank (2) and an external carbon source adding pipeline (24). Two lines of parallel pipelines are arranged on an external carbon source adding pipeline (24), an MABR pool external carbon source adding pump (3), an MABR pool external carbon source adding flow meter (4) and an MABR pool external carbon source adding automatic control valve (5) are arranged on one line of the external carbon source adding pipeline (24), an anoxic pool external carbon source adding pump (6), an anoxic pool external carbon source adding flow meter (7) and an anoxic pool external carbon source adding automatic control valve (8) are arranged on the other line of the external carbon source adding pipeline (24), and the MABR pool external carbon source adding pump (3) and the anoxic pool external carbon source adding pump (6) are electrically connected with a carbon source adding PLC control system (1). An external carbon source feeding pipeline (24) is connected with the MABR tank and the anoxic tank.
A carbon source adding optimization control system of an AOA + MABR coupling process is characterized in that an MABR pool is provided with an external sludge reflux system, and the external sludge reflux system comprises a first sludge reflux pump (9), an external sludge reflux flow meter (10), an external sludge reflux automatic control valve (11) and an external sludge reflux pipeline (25). The sludge external reflux pipeline (25) is arranged at the bottom of the sedimentation tank, the first sludge reflux pump (9) is arranged on the sludge external reflux pipeline (25) and is connected with the front end of the anaerobic tank through the sludge external reflux flow meter (10) and the sludge external reflux automatic control valve (11). The bottom of the sedimentation tank is also provided with a residual sludge pump (17) for discharging residual sludge in the sedimentation tank.
Furthermore, the inner carbon source feeding pump, the outer carbon source feeding pump, the second sludge reflux pump (12) and the first sludge reflux pump (9) are frequency conversion pumps and are provided with frequency converters.
On the basis of carbon source adding amount prediction models of an MABR tank and an aerobic tank, online monitoring data of a biochemical tank water inlet COD analyzer (19) and a TN analyzer (20) are used as feedforward parameters to be transmitted to a data processing unit of a carbon source adding PLC control system (1) for analysis. The C/N ratio of the inlet water of the biochemical pool of the water plant is about 5, and an internal carbon source adding optimization control method is started. According to the COD analyzer and NO at the front end of the MABR tank3-N analyzer, COD analyzer at front end of anoxic tank and NO3On-line monitoring data of an N analyzer, a biochemical tank water inflow flow meter (18), a sludge external return pipeline flowmeter (10), an MABR tank carbon source adding flowmeter (13) and an anoxic tank carbon source adding flowmeter (15) are transmitted to a carbon source adding PLC control system (1) data processing unit as parameters for analysis and internal carbon source adding amount calculation. According to the calculation result, the ratio of the carbon source adding amount in the MABR tank to the carbon source adding amount in the anoxic tank is 3:7, and the total reflux amount of the second sludge reflux pump is the water inlet flow of the biochemical tank.
Through carbon source addition optimization control and operation implementation, the COD concentration of the effluent of the sewage plant is stably lower than 15mg/L, the TN concentration of the effluent is stably lower than 10mg/L, and the ammonia nitrogen concentration of the effluent is stably lower than 0.5 mg/L. By optimizing and controlling the addition of the internal and external carbon sources, the internal carbon sources are more reasonably distributed and utilized in the AOA + MABR coupling process, and the addition cost of the external carbon sources in a sewage treatment plant is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (2)

1. The utility model provides a carbon source of AOA + MABR coupling process is thrown and is thrown optimal control system, anaerobism pond, good oxygen pond, oxygen deficiency pond and sedimentation tank connect in order, and the MABR pond sets up between good oxygen pond and oxygen deficiency pond, its characterized in that: an online monitoring system is arranged on the MABR tank, and comprises a flow measuring instrument (18), a COD analyzer (19) and a total nitrogen analyzer (20) which are arranged at the water inlet end of the biochemical tank; the front end of the MABR tank is provided with a COD analyzer (19) and NO3-an N analyzer (21); a sludge concentration analyzer (22) is arranged in the middle section of the MABR tank; the front end and the tail end of the anoxic tank are respectively provided with a group of COD analyzers (19) and NO3-an N analyzer (21); the on-line monitoring system is electrically connected with the carbon source adding PLC control system (1);
an inner carbon source adding system is arranged on the MABR tank and comprises a second sludge reflux pump (12) and an inner carbon source adding pipeline (23); two lines of parallel pipelines are arranged on the inner carbon source adding pipeline (23), a carbon source adding flow meter (13) in the MABR tank and a carbon source adding automatic control valve (14) in the MABR tank are arranged on one line of pipelines on the inner carbon source adding pipeline (23), and a carbon source adding flow meter (15) in the anoxic tank and a carbon source adding automatic control valve (16) in the anoxic tank are arranged on the other line of pipelines on the inner carbon source adding pipeline (23); a second sludge reflux pump (12), an MABR tank carbon source adding flowmeter (13), an MABR tank carbon source adding automatic control valve (14), an anoxic tank carbon source adding flowmeter (15) and an anoxic tank carbon source adding automatic control valve (16) are electrically connected with a carbon source adding PLC control system (1); an inner carbon source adding pipeline (23) is connected with the MABR tank and the anoxic tank;
an external carbon source adding system is arranged on the MABR tank and comprises an external carbon source storage tank (2) and an external carbon source adding pipeline (24); two lines of parallel pipelines are arranged on an external carbon source adding pipeline (24), an MABR pool external carbon source adding pump (3), an MABR pool external carbon source adding flow meter (4) and an MABR pool external carbon source adding automatic control valve (5) are arranged on one line of the external carbon source adding pipeline (24), an anoxic pool external carbon source adding pump (6), an anoxic pool external carbon source adding flow meter (7) and an anoxic pool external carbon source adding automatic control valve (8) are arranged on the other line of the external carbon source adding pipeline (24), and the MABR pool external carbon source adding pump (3) and the anoxic pool external carbon source adding pump (6) are electrically connected with a carbon source adding PLC control system (1); an external carbon source adding pipeline (24) is connected with the MABR tank and the anoxic tank;
the MABR tank is provided with a sludge external reflux system which comprises a first sludge reflux pump (9), a sludge external reflux flow meter (10), a sludge external reflux automatic control valve (11) and a sludge external reflux pipeline (25); the sludge external reflux pipeline (25) is arranged at the bottom of the sedimentation tank, the first sludge reflux pump (9) is arranged on the sludge external reflux pipeline (25) and is connected with the front end of the anaerobic tank through the sludge external reflux flow meter (10) and the sludge external reflux automatic control valve (11); the bottom of the sedimentation tank is also provided with a residual sludge pump (17) for discharging residual sludge in the sedimentation tank.
2. The system for optimizing and controlling carbon source addition in AOA + MABR coupling process according to claim 1, wherein: the second sludge reflux pump (12), the MABR tank external carbon source adding pump (3), the anoxic tank external carbon source adding pump (6) and the first sludge reflux pump (9) all adopt variable frequency pumps and are provided with frequency converters.
CN202120540439.9U 2021-03-16 2021-03-16 Carbon source adding optimization control system of AOA + MABR coupling process Active CN216141333U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113023889A (en) * 2021-03-16 2021-06-25 北控水务(中国)投资有限公司 Carbon source adding optimization control system and method for AOA + MABR coupling process
CN116395831A (en) * 2023-06-07 2023-07-07 烟台市弗兰德电子科技有限公司 Intelligent control system and method for carbon source addition in sewage treatment process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113023889A (en) * 2021-03-16 2021-06-25 北控水务(中国)投资有限公司 Carbon source adding optimization control system and method for AOA + MABR coupling process
CN116395831A (en) * 2023-06-07 2023-07-07 烟台市弗兰德电子科技有限公司 Intelligent control system and method for carbon source addition in sewage treatment process
CN116395831B (en) * 2023-06-07 2023-08-29 烟台市弗兰德电子科技有限公司 Intelligent control system and method for carbon source addition in sewage treatment process

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