CN212450840U - System for sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification - Google Patents
System for sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification Download PDFInfo
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Abstract
The utility model discloses a system for sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification. The system comprises an anaerobic reactor, a nitrification reactor, a first intermediate water tank, a second intermediate water tank, a sulfur autotrophic short-cut denitrification reactor, an anaerobic ammonia oxidation reactor and a sulfide wastewater storage device. The utility model has the advantages of it is following: various functional microorganisms with different ecological niches are placed in different sludge systems, which is beneficial to the enrichment and the improvement of metabolic activity of the microorganisms with different functions; an online control system (DO online control and pH online control) arranged in the system can realize accurate regulation and control of the operating parameters of the reactor, and is beneficial to optimizing the efficiency of the reaction system and reducing the energy consumption; compared with the traditional activated sludge treatment system, the flocculent sludge has low proportion, the sludge discharge amount is greatly reduced, and the sludge treatment cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of low C/N urban sewage treatment, more specifically relates to a system of sulphur autotrophy short cut denitrification coupling anaerobic ammonium oxidation denitrogenation.
Background
The urban sewage treatment in China generally has the problem of insufficient carbon source, the traditional biological denitrification process of nitrification and denitrification needs external source supplement of carbon source, the treatment cost is increased, and the excessive addition easily causes the problem of excessive COD of the effluent. The anaerobic ammonia oxidation technology is more and more concerned as a high-efficiency denitrification process, nitrite nitrogen is used as an electron acceptor in anaerobic ammonia oxidation, ammonia nitrogen is oxidized to generate nitrogen, no external organic carbon source is needed to be added, energy consumption is saved, and the anaerobic ammonia oxidation bacteria are autotrophic denitrification bacteria, so that the sludge yield is low, and the sludge treatment cost is reduced.
The main bottleneck of the anammox process is the problem of stable source of nitrite nitrogen. At present, two sources of nitrite nitrogen exist, namely short-cut nitrification and short-cut denitrification. For urban sewage with low ammonia nitrogen concentration, the main problem of short-cut nitrification is that effective inhibition of Nitrite Oxidizing Bacteria (NOB) is difficult to realize stably, and the system is difficult to recover in a short time after denitrification performance is reduced due to over-proliferation of NOB. The accumulation of nitrite nitrogen in short-range denitrification also has the problem that the accumulation of nitrite nitrogen cannot be stably realized for a long time, heterotrophic denitrification needs an organic electron donor, phosphorus accumulating bacteria and denitrifying bacteria compete for the electron donor in the traditional denitrification and dephosphorization process, and organic matters in municipal sewage probably cannot provide enough electrons for short-range denitrification.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a system of sulphur autotrophic short distance denitrification coupling anammox denitrogenation is provided, in order to realize city domestic sewage degree of depth denitrogenation, in the sulphur autotrophic short distance denitrification that will use the sulphide as the sulphur source is applied to city domestic sewage's degree of depth denitrogenation processing with anammox technology coupling, sulphur autotrophic denitrification process provides stable nitrite nitrogen source for anaerobic ammonia oxidation process, each device is in coordination in the system, compare with the conventional mode and have and reduce organic carbon source and energy input, save sludge treatment cost, the stable advantage of operation.
In order to achieve the above object, the present invention provides a sulfur autotrophic short-cut denitrification coupled anaerobic ammonium oxidation denitrification system, which comprises an anaerobic reactor, a nitrification reactor, a first intermediate water tank, a second intermediate water tank, a sulfur autotrophic short-cut denitrification reactor, an anaerobic ammonium oxidation reactor and a sulfide wastewater storage device;
the anaerobic reactor and the first intermediate water tank are sequentially connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor;
the nitrification reactor and the second intermediate water tank are sequentially connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
the sulfide wastewater storage device is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor, and a water outlet at the top of the anaerobic ammonia oxidation reactor is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
stirring devices are arranged in the anaerobic reactor and the nitrification reactor;
the first intermediate water tank is used for storing the drainage of the anaerobic reactor;
the second intermediate water tank is used for storing the drained water of the nitrification reactor;
in the sulfur autotrophic short-cut denitrification reactor, a supporting layer and a filler layer are filled in a reactor main body, and the filler is used as a carrier for the attachment and growth of sulfur autotrophic denitrifying bacteria;
the anaerobic ammonia oxidation reactor is used for inoculating and domesticating mature anaerobic ammonia oxidation granular sludge.
The denitrification system further comprises an aeration system, and the aeration system comprises:
the DO on-line measuring instrument is used for monitoring the DO value in the nitrification reactor;
the device comprises a gas supply device, a gas flowmeter and an aeration device which are connected in sequence, wherein the aeration device is arranged in the nitration reactor.
Preferably, the filler is a porous structured filler; the porous structured filler is more preferably at least one selected from the group consisting of granular activated carbon, ceramsite and volcanic rock.
Preferably, the anaerobic reactor adopts an SBR reactor with a stirring device arranged inside.
Preferably, the nitration reactor adopts an SBR reactor with an internal stirring device and an aeration device.
Preferably, the sulfur autotrophic short-cut denitrification reactor adopts an upflow anaerobic packed bed reactor.
Preferably, the anaerobic ammonia oxidation reactor adopts an upflow anaerobic sludge blanket.
Preferably, the top of the anaerobic ammonia oxidation reactor is provided with a three-phase separator and an overflow weir.
Preferably, the sidewall of the sulfur autotrophic short-cut denitrification reactor is provided with a plurality of sampling ports.
Preferably, the side wall of the anaerobic ammonia oxidation reactor is provided with a plurality of sampling ports.
Preferably, the air supply device is a blower or an air pump.
Preferably, the aeration device is an aeration disc or a microporous aeration pipe.
Preferably, the denitrification system further comprises a pH online control system, wherein the pH online control system comprises a pH online determinator, a pH regulating liquid medicine storage device and a medicine adding pump; and the pH regulating liquid medicine storage device inputs pH regulating liquid into the sulfur autotrophic short-distance denitrification reactor through a medicine adding pump.
Preferably, the first intermediate water tank is connected with a water inlet at the bottom of the anammox reactor through a first water inlet pump, and the first water inlet pump is used for pumping wastewater subjected to anaerobic reaction in the first intermediate water tank into the anammox reactor.
Preferably, the second intermediate water tank is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a second water inlet pump, and the second water inlet pump is used for pumping the nitrified sewage in the second intermediate water tank into the sulfur autotrophic short-cut denitrification reactor.
Preferably, the sulfide wastewater storage device is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a third water inlet pump, and the third water inlet pump is used for pumping the sulfide wastewater in the sulfide wastewater storage device into the sulfur autotrophic short-cut denitrification reactor.
Preferably, a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor through a fifth water inlet pump, and a water outlet at the top of the anaerobic ammonia oxidation reactor is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a fourth water inlet pump.
The utility model has the advantages that:
(1) a DO online control system is arranged in the nitration reactor, so that on one hand, accurate aeration can be realized, excessive aeration is avoided, and the energy consumption of aeration is saved; on the other hand, the time for finishing the aerobic phase is judged in an auxiliary way according to the change trend of DO in the reactor, so that the proper HRT is adjusted, and the overall efficiency of the reaction system is improved.
(2) The sulfur autotrophic short-cut denitrification reactor maintains the pH value in the reactor to be 8.0-8.5 through a pH online control system, and the slightly alkaline environment is favorable for maintaining the accumulation of nitrite nitrogen; after the effluent is mixed with the effluent after anaerobic acidogenesis, the pH will be slightly reduced, and the pH is still maintained in the proper pH range of the anaerobic ammoxidation reaction.
(3) The S/N of the sulfur autotrophic short-cut denitrification reactor is most suitable for nitrite nitrogen accumulation is 1.0, but as a small amount of dissolved oxygen exists in the water inlet of the reactor, the dissolved oxygen can consume part of sulfides, and the S/N (1.0-1.05) can be properly increased according to the concentration of the dissolved oxygen in the water inlet in order to ensure the removal effect of the nitrite nitrogen.
The utility model provides a pair of system of sulphur autotrophy short cut denitrification coupling anammox denitrogenation, its processing flow is: sewage respectively enters an anaerobic reactor and a nitrification reactor, complex organic matters in the anaerobic reactor are degraded into micromolecular organic matters, and COD degradation and ammonia nitrogen nitrification processes are realized in the nitrification reactor; then, the nitrified sewage and sulfide wastewater enter a sulfur autotrophic short-cut denitrification reactor together, nitrate nitrogen is reduced into nitrite nitrogen to realize the accumulation of nitrite nitrogen, and sulfide is oxidized into elemental sulfur; and then, the sewage after the short-cut denitrification and the sewage which is subjected to anaerobic treatment and is rich in ammonia nitrogen enter an anaerobic ammonia oxidation reactor together to remove the nitrogen, and micromolecule organic matters contained in the sewage after the anaerobic treatment can be used as electron donors of heterotrophic denitrification to realize the coupling of the heterotrophic denitrification and the anaerobic ammonia oxidation, so that the deep denitrification of the domestic sewage is completed.
The utility model has the advantages of it is following:
(1) various functional microorganisms with different ecological niches are placed in different sludge systems, nitrifying bacteria exist in a nitrification reactor in the form of flocculent sludge, sulfur autotrophic denitrifying bacteria exist in a sulfur autotrophic denitrification reactor in the form of a biological membrane, and anaerobic ammonia oxidizing bacteria exist in an anaerobic ammonia oxidizing reactor in the form of granular sludge, so that enrichment and metabolic activity improvement of the microorganisms with different functions are facilitated.
(2) And a part of the sewage after anaerobic treatment enters an anaerobic ammonia oxidation reactor, and micromolecular organic matters contained in the sewage can provide an electron donor for the traditional heterotrophic denitrification, so that the coupling of the heterotrophic denitrification and the anaerobic ammonia oxidation is realized, and the denitrification efficiency of the system is improved.
(3) The nitrification reactor can respectively realize anaerobic phosphorus release and aerobic excessive phosphorus absorption through the reactions of an anaerobic stage and an aerobic stage, and can realize biological phosphorus removal of partial sewage through sludge discharge.
(4) Compared with the traditional activated sludge treatment system, the flocculent sludge has low proportion, the sludge discharge amount is greatly reduced, and the sludge treatment cost is reduced.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
Fig. 1 shows a schematic structural diagram of a system for sulfur autotrophic short-cut denitrification coupled with anammox denitrification according to an embodiment of the present invention.
Description of reference numerals:
1-anaerobic reactor, 2-nitration reactor, 3-first intermediate water tank, 4-second intermediate water tank, 5-sulfur autotrophic short-cut denitrification reactor, 6-anaerobic ammoxidation reactor, 7-sulfide wastewater storage device, 8-first water inlet pump, 9-second water inlet pump, 10-third water inlet pump, 11-fourth water inlet pump, 12-fifth water inlet pump, 13-dosing pump, 21-DO online tester, 22-gas flowmeter, 23-gas supply device, 24-aeration device, 51-pH online tester, 52-pH adjusting liquid medicine storage device, 61-three-phase separator and 62-overflow weir.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides a system for coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation denitrification, which comprises an anaerobic reactor, a nitrification reactor, a first intermediate water tank, a second intermediate water tank, a sulfur autotrophic short-cut denitrification reactor, an anaerobic ammonia oxidation reactor and a sulfide wastewater storage device;
the anaerobic reactor, the first intermediate water tank and a water inlet at the bottom of the anaerobic ammonia oxidation reactor are sequentially connected;
the nitrification reactor and the second intermediate water tank are sequentially connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
the sulfide wastewater storage device is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor, and a water outlet at the top of the anaerobic ammonia oxidation reactor is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor;
stirring devices are arranged in the anaerobic reactor and the nitrification reactor;
the first intermediate water tank is used for storing the drainage of the anaerobic reactor;
the second intermediate water tank is used for storing the drained water of the nitration reactor;
the sulfur autotrophic short-cut denitrification reactor is characterized in that a supporting layer and a filler layer are filled in a reactor main body, and the filler is used as a carrier for the attachment and growth of sulfur autotrophic denitrifying bacteria;
the anaerobic ammonia oxidation reactor is used for inoculating and domesticating mature anaerobic ammonia oxidation granular sludge.
The denitrification system also comprises an aeration system, and the aeration system comprises:
the DO on-line measuring instrument is used for monitoring the DO value in the nitrification reactor;
the device comprises a gas supply device, a gas flowmeter and an aeration device which are connected in sequence, wherein the aeration device is arranged in the nitration reactor.
The supporting layer filled in the sulfur autotrophic short-cut denitrification reactor is conventionally arranged in the field, and generally, a water distribution plate is arranged at the bottom of the sulfur autotrophic short-cut denitrification reactor, and the supporting layer consisting of gravels with different particle sizes is filled above the water distribution plate at a certain height to play a role in uniformly distributing water and supporting a packing layer; the filler is uniformly distributed above the bearing layer and is used as a carrier for the growth of microorganisms, and the top of the reactor is provided with a vent hole. The filler may be one conventionally used by those skilled in the art, and preferably a porous structured filler is used, and more preferably at least one selected from the group consisting of granular activated carbon, ceramsite and volcanic rock.
Preferably, the anaerobic reactor is an SBR reactor with a stirring device arranged inside.
Preferably, the nitration reactor employs an SBR reactor in which a stirring device and an aeration device are provided.
Preferably, the sulfur autotrophic short-cut denitrification reactor adopts an upflow anaerobic packed bed reactor.
Preferably, the anammox reactor takes the form of an upflow anaerobic sludge blanket, i.e., UASB, inoculated with acclimatized mature anammox granular sludge and fed with water from the bottom.
Preferably, the top of the anammox reactor is also provided with a three-phase separator and a weir, in a manner conventional in the art. The effluent overflows through an overflow weir, and a backflow water outlet is arranged below the three-phase separator. And the effluent flows back to the water inlet of the sulfur autotrophic short-cut denitrification reactor to increase the ascending flow rate of the sulfur autotrophic short-cut denitrification reactor and the anaerobic ammonia oxidation reactor, so that the filler of the sulfur autotrophic short-cut denitrification reactor is more uniformly coated, the granular sludge in the anaerobic ammonia oxidation reactor obtains larger shearing force, the generated gas is easier to discharge, and in addition, a small amount of nitrate nitrogen generated by the anaerobic ammonia oxidation reaction can also flow back to the sulfur autotrophic short-cut denitrification reactor for short-cut denitrification reaction.
Preferably, the side wall of the sulfur autotrophic short-cut denitrification reactor is provided with a plurality of sampling ports, and the plurality of sampling ports are positioned at different heights of the side wall so as to facilitate the sampling analysis of the biological membrane on the packing at different positions.
Preferably, the side wall of the anammox reactor is provided with a plurality of sampling ports, and the plurality of sampling ports are positioned at different heights of the side wall so as to facilitate sampling at different positions.
Preferably, the air supply device is a blower or an air pump.
Preferably, the aeration device is an aeration disc or a microporous aeration pipe.
Preferably, the denitrification system further comprises a pH online control system, wherein the pH online control system comprises a pH online determinator, a pH regulating liquid medicine storage device and a medicine adding pump; the pH regulating liquid medicine storage device inputs pH regulating liquid into the sulfur autotrophic short-cut denitrification reactor through a medicine adding pump, and the pH regulating liquid can be dilute acid or dilute alkali solution.
Preferably, the first intermediate water tank is connected with a water inlet at the bottom of the anammox reactor through a first water inlet pump, and the first water inlet pump is used for pumping the wastewater subjected to anaerobic reaction in the first intermediate water tank into the anammox reactor.
Preferably, the second intermediate water tank is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a second water inlet pump, and the second water inlet pump is used for pumping the nitrified sewage in the second intermediate water tank into the sulfur autotrophic short-cut denitrification reactor.
Preferably, the sulfide wastewater storage device is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a third water inlet pump, and the third water inlet pump is used for pumping the sulfide wastewater in the sulfide wastewater storage device into the sulfur autotrophic short-cut denitrification reactor.
Preferably, a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor through a fifth water inlet pump, and a water outlet at the top of the anaerobic ammonia oxidation reactor is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor through a fourth water inlet pump.
The method adopting the sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification system comprises the following steps:
step 1: connection and starting of the system:
inoculating common activated sludge into the anaerobic reactor and the nitrification reactor to ensure that the concentration of the sludge is 3000-5000 mg/L; anaerobic reaction is carried out by an anaerobic reactor, effluent is discharged into a first intermediate water tank, anaerobic-aerobic reaction is carried out by a nitration reactor, anaerobic stirring is carried out firstly, then aerobic aeration is carried out, and effluent is discharged into a second intermediate water tank; the wastewater in the second intermediate water tank and the sulfide wastewater in the sulfide wastewater storage device are connected into a sulfur autotrophic short-cut denitrification reactor which is successfully started for short-cut denitrification, and the effluent and the wastewater in the first intermediate water tank are connected into an anaerobic ammonia oxidation reactor which is successfully started for autotrophic denitrification; part of the effluent of the anaerobic ammonia oxidation reactor flows back to a water inlet of the sulfur autotrophic short-cut denitrification reactor, and part of the effluent flows out from the top of the anaerobic ammonia oxidation reactor;
wherein the flow rate of the wastewater connected to the anaerobic ammonia oxidation reactor which is successfully started in the first intermediate water tank is Q1; the flow rate of the wastewater connected into the sulfur autotrophic short-cut denitrification reactor which is successfully started from the second intermediate water tank is Q2; the flow rate of the sulfide wastewater connected to the sulfur autotrophic short-cut denitrification reactor which is successfully started in the sulfide wastewater storage device is Q3; the flow rate of the reflux to the sulfur autotrophic short-cut denitrification reactor is Q4, and the flow rate of the total effluent is Q1+ Q2+ Q3;
step 2: regulation of a system
Step 2.1: performing anaerobic reaction by using an anaerobic reactor, decomposing complex organic matters into micromolecular organic matters, stirring for 1-2 hours after water inflow is finished, precipitating and draining for 25-35 min, wherein the drainage ratio is 40% -60%;
step 2.2: carrying out anaerobic-aerobic reaction in a nitration reactor, firstly completing decomposition of organic matters and release of phosphorus under an anaerobic stirring state, then completing oxidation of ammonia nitrogen, degradation of COD and absorption of phosphorus under an aerobic aeration condition, stirring for 1-2 h after water inflow is finished, then carrying out aerobic aeration for 2-4 h, controlling DO concentration at an aerobic stage to be 1-2 mg/L, precipitating and draining for 25-35 min, wherein the drainage ratio is 50-60%, and sludge is discharged every day to enable the sludge age to be 10-20 days;
step 2.3: carrying out short-range denitrification on nitrate in a sulfur autotrophic short-range denitrification reactor, reducing the nitrate into nitrite, oxidizing sulfide into sulfur simple substance, controlling S/N in two inflowing water streams by adjusting the proportion of Q2 and Q3 to ensure that the ratio of S/N is 1.0-1.05, controlling the pH value in the reactor to be 8.0-8.5, controlling the inflow load by adjusting the hydraulic retention time, improving the removal rate of nitrate nitrogen and the accumulation rate of nitrite nitrogen, ensuring that the removal rate of nitrate nitrogen is more than 95 percent and the accumulation rate of nitrite nitrogen is more than 85 percent;
step 2.4: anaerobic ammoxidation reaction is carried out in the anaerobic ammoxidation reactor, the ratio of nitrite nitrogen to ammonia nitrogen in the mixed inlet water is controlled to be 1.3-1.5 by regulating the proportion of Q1 to Q2, and the reflux ratio Q4/(Q1+ Q2+ Q3) is 200-500%. The proper reflux ratio can not only make a small amount of nitrate nitrogen generated in the anaerobic ammonium oxidation reactor flow back to the sulfur autotrophic short-cut denitrification reactor for reducing the nitrate nitrogen, but also help to maintain proper ascending flow rate in the sulfur autotrophic short-cut denitrification reactor and the anaerobic ammonium oxidation reactor, and proper hydraulic flushing helps to maintain proper biofilm thickness and particle size of granular sludge in the reactors.
Because the wastewater in the first intermediate water tank contains micromolecular organic matters after the anaerobic reaction and can be used as an electron donor for heterotrophic denitrification after entering the anaerobic ammonia oxidation reactor, the anaerobic ammonia oxidation reactor can realize deep denitrification by coupling anaerobic ammonia oxidation and traditional heterotrophic denitrification.
In the step 2.3, the water inflow load is controlled by adjusting the hydraulic retention time, so that the removal rate of the nitrate nitrogen and the accumulation rate of the nitrite nitrogen are improved, and the technical means conventionally adopted by the technical personnel in the field can be adjusted correspondingly according to the needs.
In the step 2.4, the ratio of nitrite nitrogen to ammonia nitrogen in the mixed inlet water is 1.3-1.5 by the skilled in the art through the regulation and control of the ratio of Q1 to Q2 according to the relevant knowledge in the field, the reflux ratio Q4/(Q1+ Q2+ Q3) is 200-500%, and how to regulate and control is the technical means conventionally adopted by the skilled in the art.
Example 1
The embodiment provides a system for coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation denitrification. The system of sulfur autotrophic short-cut denitrification coupled anaerobic ammonia oxidation denitrification is shown in figure 1.
The system comprises an anaerobic reactor 1, a nitration reactor 2, a first intermediate water tank 3, a second intermediate water tank 4, a sulfur autotrophic short-cut denitrification reactor 5, an anaerobic ammonia oxidation reactor 6 and a sulfide wastewater storage device 7;
the anaerobic reactor 1 and the first intermediate water tank 3 are sequentially connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor 6;
the nitrification reactor 2 and the second intermediate water tank 4 are sequentially connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5;
the sulfide wastewater storage device 7 is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5;
a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor 5 is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor 6, and a water outlet at the top of the anaerobic ammonia oxidation reactor 6 is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5;
stirring devices are arranged in the anaerobic reactor 1 and the nitrification reactor 2;
the first intermediate water tank 3 is used for storing the drainage of the anaerobic reactor 1;
the second intermediate water tank 4 is used for storing the drainage of the nitration reactor 2;
a sulfur autotrophic short-cut denitrification reactor 5, wherein a supporting layer and a packing layer are filled in a reactor main body;
the anaerobic ammonia oxidation reactor 6 is used for inoculating and domesticating mature anaerobic ammonia oxidation granular sludge.
The denitrification system also comprises an aeration system, and the aeration system comprises:
a DO on-line measuring instrument 21 for monitoring the DO value in the nitrification reactor 2;
a gas supply device 23, a gas flow meter 22 and an aeration device 24 which are connected in sequence, wherein the aeration device is arranged inside the nitration reactor 2.
Wherein, the bottom of the sulfur autotrophic short-cut denitrification reactor is provided with a water distribution plate, and a supporting layer which is formed by gravels with different grain diameters and has a certain height is filled above the water distribution plate to play the roles of uniformly distributing water and supporting a packing layer; the filler is uniformly distributed above the bearing layer and is used as a carrier for the growth of microorganisms, and the top of the reactor is provided with a vent hole. The filler is specifically granular activated carbon.
Wherein, the anaerobic reactor 1 adopts an SBR reactor with a stirring device arranged inside; the nitration reactor 2 adopts an SBR reactor which is internally provided with a stirring device and an aeration device 24; the sulfur autotrophic short-cut denitrification reactor 5 adopts an up-flow anaerobic packed bed reactor; the anaerobic ammonia oxidation reactor 6 adopts an up-flow anaerobic sludge bed.
Wherein, the top of the anaerobic ammonia oxidation reactor 6 is provided with a three-phase separator 61 and a weir 62, which are the conventional arrangement mode in the field. The effluent overflows through an overflow weir 62, and a return water outlet is arranged below the three-phase separator 61. And the effluent flows back to the water inlet of the sulfur autotrophic short-cut denitrification reactor to increase the ascending flow rate of the sulfur autotrophic short-cut denitrification reactor and the anaerobic ammonia oxidation reactor, so that the filler of the sulfur autotrophic short-cut denitrification reactor is more uniformly coated, the granular sludge in the anaerobic ammonia oxidation reactor obtains larger shearing force, the generated gas is easier to discharge, and in addition, a small amount of nitrate nitrogen generated by the anaerobic ammonia oxidation reaction can also flow back to the sulfur autotrophic short-cut denitrification reactor for short-cut denitrification reaction.
Wherein, the side wall of the sulfur autotrophic short-cut denitrification reactor 5 is provided with 3 sampling ports at different heights; the side wall of the anaerobic ammonia oxidation reactor 6 is provided with 5 sampling ports at different heights.
Wherein, the air supply device 23 uses an air pump, and the aeration device 24 uses a microporous aeration pipe.
The denitrification system also comprises a pH online control system, wherein the pH online control system comprises a pH online determinator 51, a pH regulating liquid medicine storage device 52 and a medicine adding pump 13; the pH adjusting liquid medicine storage device 52 inputs the pH adjusting liquid into the sulfur autotrophic short-cut denitrification reactor 5 through the medicine adding pump 13.
The first intermediate water tank 3 is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor 6 through a first water inlet pump 8, and the first water inlet pump 8 is used for pumping wastewater subjected to anaerobic reaction in the first intermediate water tank 3 into the anaerobic ammonia oxidation reactor 6; the second intermediate water tank 4 is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5 through a second water inlet pump 9, and the second water inlet pump 9 is used for pumping the nitrified sewage in the second intermediate water tank 4 into the sulfur autotrophic short-cut denitrification reactor 5; the sulfide wastewater storage device 7 is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5 through a third water inlet pump 10, and the third water inlet pump 10 is used for pumping the sulfide wastewater in the sulfide wastewater storage device 7 into the sulfur autotrophic short-cut denitrification reactor 5; the water outlet at the top of the sulfur autotrophic short-cut denitrification reactor 5 is connected with the water inlet at the bottom of the anaerobic ammonia oxidation reactor 6 through a fifth water inlet pump 12, and the water outlet at the top of the anaerobic ammonia oxidation reactor 6 is connected with the water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor 5 through a fourth water inlet pump 11.
In the embodiment of the utility model, it is the pipe connection not to show connected mode part.
The system is adopted to denitrify the effluent of a primary sedimentation tank of a certain sewage treatment plant, and the effluent quality of the primary sedimentation tank is as follows: the COD concentration is 100-180 mg/L; the ammonia nitrogen concentration is 35-45 mg/L, the nitrite nitrogen is less than or equal to 1mg/L, the nitrate nitrogen is less than or equal to 1mg/L, the TP concentration is 3-6 mg/L, and sulfide waste water is sulfide waste liquid generated by absorbing alkali liquor during wet desulphurization of certain methane. The reactors are made of organic glass, the effective volume of the anaerobic reactor is 2L, the effective volume of the nitrification reactor is 5L, and the effective volumes of the sulfur autotrophic short-cut denitrification reactor and the anaerobic ammonium oxidation reactor are 10L.
The specific operation is as follows:
1) connection and starting of the system:
inoculating common activated sludge into the anaerobic reactor 1 and the nitrification reactor 2 to ensure that the concentration of the sludge is about 4000 mg/L; the anaerobic reactor 1 carries out anaerobic reaction, the effluent is discharged into the first intermediate water tank 3, the nitration reactor 2 carries out anaerobic-aerobic reaction, anaerobic stirring is carried out firstly, then aerobic aeration is carried out, and the effluent is discharged into the second intermediate water tank 4; the wastewater (flow Q2) in the second intermediate water tank 4 and the sulfide wastewater (flow Q3) in the sulfide wastewater storage device 7 are connected into the sulfur autotrophic short-cut denitrification reactor 5 which is successfully started for short-cut denitrification, and the effluent and the wastewater (flow Q1) in the first intermediate water tank 3 are connected into the anaerobic ammonium oxidation reactor 6 which is successfully started for autotrophic denitrification; part of the effluent (flow Q4) of the anaerobic ammonia oxidation reactor 6 flows back to the water inlet of the sulfur autotrophic short-cut denitrification reactor 5, and part of the effluent (flow Q1+ Q2+ Q3) flows out through the overflow weir 62 at the top.
2) And (3) regulating the system:
2.1 the anaerobic reactor 1 carries out anaerobic reaction, after the water inflow is finished, the stirring is carried out for 2 hours, the precipitation and the water drainage are carried out for 30 minutes, and the water drainage ratio is 60 percent.
2.2 the nitration reactor 2 is subjected to anaerobic-aerobic reaction, stirring is carried out for 1.5h after water inflow is finished, then aerobic aeration is carried out for 3h, the DO concentration in an aerobic stage is controlled to be 1-2 mg/L, precipitation and drainage are carried out for 30min, the drainage ratio is 60%, and the SRT is kept for 15 days by sludge discharge every day.
2.3 short-cut denitrification of nitrate is carried out in the sulfur autotrophic short-cut denitrification reactor 5, S/N in the two inflowing water streams is controlled by adjusting the ratio of Q2 to Q3, the ratio of S/N is about 1.02 (within the range of 1.0-1.05), the pH value in the reactor is controlled to be 8.0-8.5, and the HRT is controlled to be 5 hours.
2.4 carrying out anaerobic ammoxidation reaction in the anaerobic ammoxidation reactor 6, controlling the ratio of nitrite nitrogen to ammonia nitrogen in the mixed inlet water to be 1.3-1.5 by regulating the ratio of Q1 to Q2, controlling the reflux ratio Q4/(Q1+ Q2+ Q3) to be 400 percent and controlling the HRT to be 8 hours.
The test result shows that: after the operation is stable, the COD concentration in the final effluent of the system is 30-50mg/L, the ammonia nitrogen is less than 1mg/L, the nitrate nitrogen is less than 6mg/L, and the TN is less than 10 mg/L. The utility model provides a but sulphur autotrophy short cut denitrification coupling anaerobic ammonium oxidation denitrogenation system wide application in municipal domestic sewage's processing.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A system for coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation denitrification is characterized by comprising an anaerobic reactor (1), a nitrification reactor (2), a first intermediate water tank (3), a second intermediate water tank (4), a sulfur autotrophic short-cut denitrification reactor (5), an anaerobic ammonia oxidation reactor (6) and a sulfide wastewater storage device (7);
the anaerobic reactor (1) and the first intermediate water tank (3) are sequentially connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor (6);
the nitrification reactor (2) and the second intermediate water tank (4) are sequentially connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5);
the sulfide wastewater storage device (7) is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5);
a water outlet at the top of the sulfur autotrophic short-cut denitrification reactor (5) is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor (6), and a water outlet at the top of the anaerobic ammonia oxidation reactor (6) is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5);
stirring devices are arranged in the anaerobic reactor (1) and the nitrification reactor (2);
the first intermediate water tank (3) is used for storing the drainage of the anaerobic reactor (1);
the second intermediate water tank (4) is used for storing the drainage of the nitration reactor (2);
the sulfur autotrophic short-cut denitrification reactor (5) is characterized in that a supporting layer and a filler layer are filled in a reactor main body, and the filler is used as a carrier for the attachment and growth of sulfur autotrophic denitrifying bacteria;
the anaerobic ammonia oxidation reactor (6) is used for inoculating and domesticating mature anaerobic ammonia oxidation granular sludge;
the denitrification system further comprises an aeration system, and the aeration system comprises:
a DO on-line measuring instrument (21) for monitoring the DO value in the nitrification reactor (2);
the device comprises a gas supply device (23), a gas flowmeter (22) and an aeration device (24) which are connected in sequence, wherein the aeration device is arranged in the nitrification reactor (2).
2. The system of claim 1, wherein the system comprises a sulfur autotrophic short-cut denitrification coupled with anammox denitrification,
the anaerobic reactor (1) adopts an SBR reactor with a stirring device arranged inside;
the nitration reactor (2) adopts an SBR reactor which is internally provided with a stirring device and an aeration device (24);
the sulfur autotrophic short-cut denitrification reactor (5) adopts an up-flow anaerobic packed bed reactor;
the anaerobic ammonia oxidation reactor (6) adopts an up-flow anaerobic sludge bed.
3. The system for coupling the anammox denitrification by sulfur autotrophic short-cut denitrification according to claim 1, wherein the top of the anammox reactor (6) is further provided with a three-phase separator (61) and a weir (62).
4. The system of claim 1, wherein the system comprises a sulfur autotrophic short-cut denitrification coupled with anammox denitrification,
the side wall of the sulfur autotrophic short-cut denitrification reactor (5) is provided with a plurality of sampling ports;
the side wall of the anaerobic ammonia oxidation reactor (6) is provided with a plurality of sampling ports.
5. The system for coupling the anammox denitrification by sulfur autotrophic short-cut denitrification according to claim 1, wherein the gas supply device (23) is a blower or a gas pump.
6. The system of claim 1, wherein the aeration device (24) is an aeration disk or a microporous aeration pipe.
7. The system of claim 1, wherein the filler is a porous filler.
8. The system of claim 7, wherein the porous structured filler is at least one selected from the group consisting of granular activated carbon, ceramsite and volcanic rock.
9. The system for the denitrification coupling the anaerobic ammonia oxidation by the sulfur autotrophic short-cut denitrification according to claim 1, wherein the denitrification system further comprises a pH on-line control system, and the pH on-line control system comprises a pH on-line determinator (51), a pH regulating solution storage device (52) and a dosing pump (13); the pH adjusting liquid medicine storage device (52) inputs pH adjusting liquid into the sulfur autotrophic short-cut denitrification reactor (5) through a medicine adding pump (13).
10. The system of claim 1, wherein the system comprises a sulfur autotrophic short-cut denitrification coupled with anammox denitrification,
the first intermediate water tank (3) is connected with a water inlet at the bottom of the anaerobic ammonia oxidation reactor (6) through a first water inlet pump (8), and the first water inlet pump (8) is used for pumping wastewater subjected to anaerobic reaction in the first intermediate water tank (3) into the anaerobic ammonia oxidation reactor (6);
the second intermediate water tank (4) is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5) through a second water inlet pump (9), and the second water inlet pump (9) is used for pumping the nitrified sewage in the second intermediate water tank (4) into the sulfur autotrophic short-cut denitrification reactor (5);
the sulfide wastewater storage device (7) is connected with a water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5) through a third water inlet pump (10), and the third water inlet pump (10) is used for pumping sulfide wastewater in the sulfide wastewater storage device (7) into the sulfur autotrophic short-cut denitrification reactor (5);
the water outlet at the top of the sulfur autotrophic short-cut denitrification reactor (5) is connected with the water inlet at the bottom of the anaerobic ammonia oxidation reactor (6) through a fifth water inlet pump (12), and the water outlet at the top of the anaerobic ammonia oxidation reactor (6) is connected with the water inlet at the bottom of the sulfur autotrophic short-cut denitrification reactor (5) through a fourth water inlet pump (11).
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| CN111661924A (en) * | 2020-07-14 | 2020-09-15 | 北京城市排水集团有限责任公司 | System and method for sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification |
| CN114804354A (en) * | 2022-06-24 | 2022-07-29 | 北京涞澈科技发展有限公司 | Biological rotary drum denitrification filter tank and denitrification treatment system based on sulfur autotrophy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661924A (en) * | 2020-07-14 | 2020-09-15 | 北京城市排水集团有限责任公司 | System and method for sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation denitrification |
| CN114804354A (en) * | 2022-06-24 | 2022-07-29 | 北京涞澈科技发展有限公司 | Biological rotary drum denitrification filter tank and denitrification treatment system based on sulfur autotrophy |
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