CN116002861A - Built-in internal and external mixed liquid backflow two-stage anoxic-aerobic device and process for precipitation - Google Patents
Built-in internal and external mixed liquid backflow two-stage anoxic-aerobic device and process for precipitation Download PDFInfo
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Abstract
The application discloses an integrated sediment built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device and process. The device comprises: the first-stage AO (anoxic-aerobic) treatment device comprises a first anoxic zone, a first aerobic zone and a first sedimentation zone, wherein the first aerobic zone is low in oxygen, a first stripping device is arranged in the first aerobic zone and is communicated with the first anoxic zone, and a second stripping device is communicated with the first sedimentation zone; the second-stage AO processing apparatus includes: the second anoxic zone, the second aerobic zone and the second sedimentation zone, a third gas stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank, and the gas-liquid-solid separation tank is provided with: the first water outlet is communicated with the first anoxic zone, the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the second sedimentation zone. The device adopts two-stage AO, and respectively has an interior mixed solution backward flow and an outside mixed solution backward flow from second grade O to first grade A in the inside, improves the nitrifying and denitrification treatment effect of waste water, thoroughly gets rid of ammonia nitrogen, total nitrogen in the waste water.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to an integrated sediment built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device and process suitable for denitrification treatment of high ammonia nitrogen wastewater such as coking wastewater, cultivation wastewater, coal chemical wastewater, cold rolling leveling liquid wastewater and the like.
Background
The prior biochemical treatment of high ammonia nitrogen wastewater, such as coking wastewater, adopts an anoxic/aerobic (A/O) basic denitrification unit process or an expanded process based on the anoxic/aerobic basic denitrification unit process: (1) An anoxic/aerobic (A/O) activated sludge process denitrification process; (2) anoxic/aerobic (A/O) biomembrane denitrification process; (3) Anaerobic/anoxic/aerobic (a/O) biological denitrification processes, but these processes require a large amount of additional carbon sources. In addition, the ammonia nitrogen in the wastewater is removed by the processes with low efficiency.
For this reason, it is necessary to improve the existing treatment process for high ammonia nitrogen wastewater.
Disclosure of Invention
In view of this, the present application proposes an integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic aerobic device (hereinafter referred to as device) and process/treatment technology. The device adopts two-stage AO, and respectively there is an interior mixed solution backward flow in AO inside, and still has an outside mixed solution backward flow from second grade O to one-level A in addition, has improved the nitrifying and denitrification treatment effect of waste water like this, can thoroughly get rid of the ammonia nitrogen in the waste water.
In order to achieve the above purpose, the present application adopts the following technical scheme:
an integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic-aerobic device, which comprises:
a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone, a first aerobic zone and a first sedimentation zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, a second air stripping device is arranged in the first aerobic zone, the first air stripping device passes through a first gas-liquid-solid separation tank positioned in the first-stage AO treatment device, the first gas-liquid-solid separation tank is connected with a water distribution device of the first sedimentation zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: a second anoxic zone, a second aerobic zone and a second sedimentation zone,
a second stirring device is arranged in the second anoxic zone, and the second anoxic zone is communicated with a water outlet of the first precipitation zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the first-stage AO processing device and the second-stage AO processing device,
the second gas-liquid-solid separation tank is provided with: a first water outlet communicated with the first anoxic zone,
the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the (water distribution device in the) second sedimentation zone. The device of the application adopts two-stage AO, and the interior respectively has an interior mixed liquor backward flow and an external mixed liquor backward flow from second grade O to one-level A, improves the nitrifying and denitrification treatment effect of waste water, thoroughly gets rid of ammonia nitrogen, total nitrogen in the waste water.
Preferably, the first sedimentation zone is arranged between the first anoxic zone and the first aerobic zone, the first anoxic zone is communicated with the first aerobic zone through a pipeline, a water distributor is arranged in the first sedimentation zone, and the water distributor is communicated with the water outlet of the first gas-liquid-solid separation tank.
Preferably, the second precipitation zone is arranged between the second anoxic zone and the second aerobic zone, and is internally provided with a water distributor which is communicated with a third water outlet of the second gas-liquid-solid separation tank.
Preferably, a third stripping device is arranged in the second aerobic zone, and extends to the water inlet side of the first anoxic zone through a second gas-liquid-solid separation tank.
Preferably, the second gas-liquid-solid separation tank is provided with three water outlets, the first water outlet is communicated with the first anoxic zone, the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the second sedimentation zone.
Preferably, three water outlets of the second gas-liquid-solid separation tank are respectively provided with a water outlet pipe, and the water outlet pipes are respectively provided with a metering device and an adjusting device (an adjusting gate).
The embodiment of the application provides an integrated sediment built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device, which comprises: a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone and a first aerobic zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: the device comprises a second anoxic zone, a second aerobic zone and a second sedimentation zone, wherein a second stirring device is arranged in the second anoxic zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the second aerobic zone,
the second gas-liquid-solid separation tank is provided with:
a first water outlet communicated with the first anoxic zone,
a second water outlet communicated with the second anoxic zone,
and the third water outlet is communicated with the water distribution device in the second precipitation zone.
The embodiment of the application provides an integrated sediment built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device, which comprises: a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone, a first aerobic zone and a second sedimentation zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: a second anoxic zone and a second aerobic zone,
a second stirring device is arranged in the second anoxic zone, and the second anoxic zone is communicated with the water outlet of the first aerobic zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the first-stage AO processing device and the second-stage AO processing device,
the second gas-liquid-solid separation tank is provided with 3 water outlets which are sequentially connected to the first anoxic zone, the second sedimentation zone and the second anoxic zone. (one of the 3 water outlets is connected to the first anoxic zone, one is connected to the second sedimentation zone and the other is connected to the second anoxic zone). The second sedimentation zone is arranged between the anoxic zone 1 and the aerobic zone 1, so that the sedimented sludge directly flows back to the anoxic zone 1.
Preferably, the first aerobic zone and the second aerobic zone are respectively provided with an aeration device, the aeration devices adopt flexible perforated aeration pipes, the aeration pipes are provided with air outlet holes, and the air outlet holes are vertically and downwards uniformly arranged or the aeration devices are microporous aeration devices.
The embodiment of the application provides a process (also called a treatment process) of the device, which comprises the following steps:
raw water enters a first anoxic zone and is mixed with mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter from a first aerobic zone and a second aerobic zone, and the nitrite nitrogen and the nitrate nitrogen are reduced into nitrogen under the action of denitrifying bacteria to carry out denitrification treatment;
the wastewater treated by the first anoxic zone flows into a first aerobic zone, and short-range nitration reaction is carried out in a low-oxygen environment so as to convert ammonia nitrogen in the wastewater into nitrite nitrogen, and organic matters are degraded into CO 2 And H 2 O；
Part of the mixed liquid treated by the first aerobic zone flows back to the first anoxic zone for treatment through a first gas stripping device, and the other part of the mixed liquid is lifted by a second gas stripping device to pass through a first gas-liquid-solid separation tank and then enters a first sedimentation zone for sedimentation, supernatant liquid after sedimentation in the first sedimentation zone enters a second anoxic zone, and the sedimented sludge part flows back to the first anoxic zone through a sludge backflow port, and is partially discharged through a sludge discharge pipe or is discharged to the second anoxic zone;
the supernatant fluid flowing out of the first precipitation zone enters a second anoxic zone and is mixed with the mixed liquid which synchronously enters and flows back from a second aerobic zone to carry out denitrification reaction;
the wastewater treated by the second anoxic zone enters a second aerobic zone and is subjected to nitration reaction under the action of nitrifying bacteria so as to convert ammonia nitrogen into nitrate nitrogen, and organic matters are degraded into CO 2 And H 2 O；
The mixed liquid treated in the second aerobic zone is lifted by a third gas stripping device and flows to the first anoxic zone, the second anoxic zone and the second sedimentation zone respectively after passing through a second gas-liquid-solid separation tank, the supernatant fluid precipitated in the second sedimentation zone is discharged through a water outlet weir and a water discharge pipe of the second sedimentation zone, and part of precipitated sludge flows back to the second anoxic zone through a sludge return port and is discharged through a sludge discharge pipe. The process improves the nitrification and denitrification treatment effects of the wastewater, and thoroughly removes ammonia nitrogen and total nitrogen in the wastewater.
Preferably, the first aerobic zone is low oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second stripping device lifts the mixed liquid of the first aerobic zone to a first gas-solid-liquid separation tank, the mixed liquid enters a first sedimentation zone after being released, and the flow of the stripping device from the first aerobic zone to the first sedimentation zone is 3-5 times of the water inflow.
Advantageous effects
Compared with the prior art, the two-stage AO device of the embodiment of the present application has the following advantages:
1) The first-stage AO adopts short-cut nitrification and denitrification, so that carbon sources are saved, the oxygen consumption is reduced, the operation cost is reduced, and meanwhile, the growth of anaerobic ammonia oxidizing bacteria is facilitated, and the anaerobic ammonia oxidizing bacteria are used as auxiliary treatment for denitrification; the O section in the second-stage AO is aerobic, so that ammonia nitrogen in the wastewater is thoroughly removed.
2) The first-stage AO maintains an anoxic and low-oxygen environment, has high denitrification efficiency, is favorable for hydrolysis and acidification of refractory organic matters, and reduces the generation of foam during aeration.
3) Two-stage AO, inside respectively have an interior mixed liquor backward flow, still have one from second grade O to the outer mixed liquor backward flow of one-level A in addition, improved the nitrifying and denitrification treatment effect of waste water, can thoroughly get rid of the ammonia nitrogen in the waste water.
4) The sedimentation integrated structure is adopted, the sludge concentration is high, the pool Rong Xiao under the same load is small in occupied area, the movable equipment is few, and the maintenance workload is small.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.
FIG. 1 is a flow chart of a treatment method of an integrated sedimentation built-in internal and external mixed liquor backflow two-stage anoxic and aerobic process according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of an integrated sedimentation internal and external mixed liquid backflow two-stage anoxic aerobic device according to a first embodiment of the present invention.
FIG. 3 is a schematic structural view of an integrated sedimentation internal and external mixed liquid backflow two-stage anoxic aerobic device according to a second embodiment of the present invention.
FIG. 4 is a schematic structural view of an integrated sedimentation internal and external mixed liquid backflow two-stage anoxic aerobic device according to a third embodiment of the present invention.
Fig. 5 is an example of a belt control system of the embodiment of fig. 4.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The application provides an integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device and process.
The device comprises: cascaded first-stage AO (anoxic-oxic) treatment device and second-stage AO (anoxic-oxic) treatment device, wherein the output of the first-stage AO treatment device directly flows into the second-stage AO treatment device;
the first-stage AO treatment device comprises a first anoxic zone, a first aerobic zone and a first sedimentation zone, wherein the first aerobic zone is low in oxygen, the dissolved oxygen of the first aerobic zone is 1-1.5 mg/L, a first stripping device and a second stripping device are arranged in the first aerobic zone, the first stripping device is communicated with the first anoxic zone, and the second stripping device is communicated with the first sedimentation zone;
the second-stage AO processing apparatus includes: the second anaerobic zone, the second aerobic zone and the second sedimentation zone, wherein a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank above the first-stage AO processing device and the second-stage AO processing device, and the second gas-liquid-solid separation tank is provided with (3 water outlets): the first water outlet is communicated with the first anoxic zone, the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the second sedimentation zone. As described above, the two-stage AO is adopted in the application, one inner mixed liquid flows back, and the other outer mixed liquid flows back from the two-stage O to the one-stage A, so that the nitrification and denitrification treatment effects of the wastewater are improved, and ammonia nitrogen and total nitrogen in the wastewater can be thoroughly removed. The process of the two-stage AO device is the combination of AO+AO precipitation, AO precipitation+AO precipitation and an integrated precipitation built-in biochemical reactor. Wherein, the first-stage AO adopts short-cut nitrification and denitrification, which saves carbon source, reduces oxygen consumption, reduces operation cost and is beneficial to the growth of anammox bacteria. The first-stage AO maintains an anoxic and low-oxygen environment, has high denitrification efficiency, is favorable for hydrolysis and acidification of refractory organic matters, and reduces the generation of foam during aeration. Two-stage AO, inside respectively have an interior mixed liquor backward flow, still have a secondary O to the outer mixed liquor backward flow of one-level A in addition, improved the nitrifying and denitrification treatment effect of waste water, can thoroughly get rid of ammonia nitrogen, total nitrogen in the waste water. The sedimentation is internally provided with an integrated structure, the sludge concentration is high, the pool Rong Xiao under the same load has small occupied area, less movable equipment and less maintenance workload.
Next, an integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic-aerobic device (hereinafter referred to as device) and a process are described with reference to the accompanying drawings.
As shown in fig. 1, the integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic and aerobic process comprises the following treatment processes:
the waste water to be treated (also called raw water) enters first-stage anoxic through a first-stage anoxic water inlet, the entered waste water and the mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter first-stage aerobic and second-stage aerobic reflux are mixed under the stirring of a stirring device, denitrification is carried out under the action of denitrifying bacteria, the nitrite nitrogen and the nitrate nitrogen are reduced into nitrogen, and simultaneously, organic high molecular substances hydrolyze Cheng Yi biodegradable micromolecular organic substances;
the wastewater subjected to primary anoxic treatment enters primary aerobic through a communicating pipe, oxygen is supplied by an aeration device, short-range nitration reaction is carried out under the action of nitrosating bacteria in a low-oxygen environment, ammonia nitrogen is converted into nitrite nitrogen, and organic matters are degraded into CO 2 And H 2 O；
Part of the mixed liquid after the primary aerobic treatment flows back to the primary anoxic treatment through the gas stripping device, and the other part of the mixed liquid is lifted by the gas stripping device to pass through the gas-liquid-solid separation tank and then enters the precipitation zone to be subjected to precipitation after being uniformly distributed by the water distributor, wherein the primary aerobic treatment is low-oxygen aeration, and the nitrosation reaction is mainly performed.
Supernatant fluid after being precipitated in the first-stage precipitation zone enters the second-stage anoxic through a water outlet weir of the first-stage precipitation zone, part of precipitated sludge flows back to the first-stage anoxic through a sludge return port, and the other part of the precipitated sludge is discharged through a sludge discharge pipe sludge discharge pump or is discharged into the second-stage anoxic through a valve, so that the concentration of the second-stage anoxic and the second-stage aerobic sludge is maintained;
the mixed liquid after the secondary anoxic treatment is lifted by the gas stripping device and flows to the water distributor of the primary anoxic and secondary sedimentation zone through the corresponding valve and metering device after passing through the gas-liquid-solid separation tank, and is evenly distributed and sedimentated to realize solid-liquid separation.
Supernatant fluid precipitated in the secondary precipitation zone is discharged through a water outlet weir and a water discharge pipe of the secondary precipitation zone, and part of precipitated sludge flows back to the secondary anoxic zone through a sludge reflux port and is discharged through the discharge pipe.
In the embodiment, the liquid level of the sedimentation zone (primary/secondary sedimentation) is respectively higher than that of the anoxic zone, and the liquid level of the anoxic zone is higher than that of the aerobic zone, so that the operation energy consumption of the device is reduced, and the economic benefit is improved. In this embodiment, the mixed solution in the aerobic zone enters the precipitation zone (primary/secondary precipitation), and the mixed solution in the aerobic zone enters the anoxic zone (primary/secondary anoxic) respectively requires a stripping device to achieve lifting. The large-proportion sludge reflux (about 3-5:1) ensures the amount of the reflux sludge entering the anoxic zone, so that the biomass of the whole system is increased, and the sludge concentration of the device can reach about 6000-10000 mg/L. The reflux quantity of the mixed liquor with a large proportion (about 20-30:1) is 20-30 times of the water inflow of the system, so that the guarantee is provided for removing total nitrogen, and meanwhile, the concentration of the inflow water is diluted, so that toxic substances are diluted.
In the process, the first-stage aerobic zone is low in oxygen, the dissolved oxygen is 1-1.5 mg/L, the pH is controlled to be 7.4-8.3, and the first-stage AO in the two-stage AO is short-cut nitrification and denitrification.
The process adopts two-stage anoxic and aerobic treatment. The first-stage AO adopts short-cut nitrification and denitrification, so that carbon sources are saved, oxygen consumption is reduced, operation cost can be reduced, growth of anaerobic ammonia oxidizing bacteria is facilitated, and removal of total nitrogen of ammonia nitrogen under the condition of low consumption is facilitated. The first-stage AO maintains an anoxic and low-oxygen environment, has high denitrification efficiency, is favorable for hydrolysis and acidification of refractory organic matters, reduces foam generation during aeration, and returns an external mixed solution from the second-stage O to the first-stage A, so that the nitrification and denitrification treatment effects of the wastewater are improved, and the total nitrogen of ammonia nitrogen in the wastewater can be thoroughly removed. As disclosed in chinese patent No. CN110127847a, an integrated wastewater treatment apparatus and a treatment method thereof are disclosed, the disclosed apparatus includes an anoxic zone, an aerobic zone, and a sedimentation zone between the anoxic zone and the aerobic zone, ammonia nitrogen in the wastewater in the aerobic zone is converted into nitrite, short-cut nitrification treatment is performed, the short-cut nitrified wastewater is returned to the anoxic zone for denitrification, and short-cut nitrification denitrification is realized. The method is further upgraded on the basis, a one-stage integrated precipitation built-in biochemical reaction process is added, two-stage AO are connected in series (in cascade), the nitrification and denitrification treatment effects of the wastewater are improved, and the total nitrogen of ammonia nitrogen in the wastewater can be thoroughly removed. The process is particularly suitable for denitrification treatment of high ammonia nitrogen wastewater, can thoroughly remove nitrogen, has high ammonia nitrogen and total nitrogen removal rate, can realize short-range nitrification and denitrification, saves energy consumption, reduces pollution with low carbon, and can be used for treatment of coking wastewater, breeding wastewater, coal chemical wastewater, high-concentration leveling liquid wastewater and the like.
As shown in fig. 2, a schematic structural diagram of an integrated sedimentation internal-external mixed liquid backflow two-stage anoxic-aerobic device according to a first embodiment of the present application is shown, each AO is configured with a sedimentation zone,
the processing device comprises:
an anoxic zone 1 (i.e. primary anoxic), an aerobic zone 1 (i.e. primary aerobic) and a sedimentation zone 1 (i.e. primary sedimentation) between the anoxic zone 1 and the aerobic zone 1, wherein a stirrer 2a is arranged in the anoxic zone 1, the anoxic zone 1 is communicated with the aerobic zone 1 through a pipeline 10a, an aeration device 3a is arranged in the aerobic zone 1, a gas stripping device 1a extends to the anoxic zone 1, a water outlet of the gas stripping device 1a is close to a raw water inlet side, a gas stripping device 1b is connected to a gas-solid-liquid separation tank 4a positioned at the upper side of the aerobic zone 1, the water outlet of the gas-solid-liquid separation tank 4a is communicated with the sedimentation zone 1, a water distributor 5a and a water outlet weir 6a are arranged in the sedimentation zone 1,
the anaerobic zone 2 (i.e. secondary anaerobic), the aerobic zone 2 (i.e. secondary aerobic), and the sedimentation zone 2 (i.e. secondary sedimentation) between the anaerobic zone 2 and the aerobic zone 2, wherein a stirrer 2b is arranged in the anaerobic zone 2, the anaerobic zone 2 and the aerobic zone 2 are communicated through a pipeline 10b, the aerobic zone 2 is provided with an aeration device 3b, a gas stripping device 1c is connected to a gas-solid-liquid separation tank 4b positioned on the upper side of the aerobic zone 2, the gas-solid-liquid separation tank 4b is provided with a first water outlet which is communicated with a water inlet side close to a raw water inlet through a valve (gate) 7a and a metering device 8a, a second water outlet which is communicated with a water inlet T1 side of the aerobic zone 2 through a valve (gate) 7b and a metering device 8b, and a third water outlet which is communicated with a water distributor 5b of the sedimentation zone 2 through a valve (gate) 7c and a metering device 8 c.
The sedimentation zone 1 and the sedimentation zone 2 are respectively provided with sludge discharge pumps 9a and 9b for discharging surplus sludge. The sludge discharge pump 9a is provided with valves (gates) 7d and 7e for respectively opening or closing the sludge discharge pipe to the anoxic zone 2 and the external sewage sludge discharge pipe.
When the device is operated, raw water (wastewater) flows into the anoxic zone 1 from a water inlet, when the inflow water reaches a certain height, a stirrer 2a of the anoxic zone 1 is started based on a control system to stir, water treated by the anoxic zone 1 flows into the anoxic zone 1 through a hole arranged at the bottom of the anoxic zone 1 and a pipeline 10a, when the water flowing into the aerobic zone 1 reaches a certain height, an aeration device 3a is started based on the control system, when mixed liquid treated by the aerobic zone 1 reaches a working liquid level, a gas stripping device 1a from the aerobic zone 1 to the anoxic zone 1 is started, part of mixed liquid flows back to the anoxic zone 1, a gas stripping device 1b from the aerobic zone 1 to a sedimentation zone 1 is started, part of mixed liquid is lifted, separated and released by a gas-solid-liquid separation tank 4a and then enters the sedimentation zone 1 to precipitate, supernatant liquid after sedimentation in the sedimentation zone 1 enters the anoxic zone 2 through a water outlet weir 6a and a water outlet T1, and part of settled sludge is returned to the anoxic zone 1 through a sludge reflux port or discharged out of the anoxic zone 2 through a sludge reflux port 9 a.
When the wastewater entering the anoxic zone 2 from the sedimentation zone 1 reaches a certain height, a stirrer 2b of the anoxic zone 2 is started based on a control system to stir, the water treated by the anoxic zone 2 flows into the anoxic zone 2 through a hole arranged at the bottom of the anoxic zone 2 through a pipeline 10b, when the water flowing into the aerobic zone 2 reaches a certain height, an aeration device 3b is started based on the control system, when the mixed liquid treated by the aerobic zone 2 reaches a working liquid level, a gas stripping device 1c of the aerobic zone 2 is started, the mixed liquid of the aerobic zone 2 is lifted, separated and released through a gas-liquid-solid separation tank 4b, and then metered by a valve adjusting metering device and enters the sedimentation zone 2, the anoxic zone 2 and the anoxic zone 1 respectively, supernatant liquid after sedimentation in the sedimentation zone 2 is discharged through a water outlet weir 6b and a drain pipe of the sedimentation zone 2, and part of settled sludge flows back to the anoxic zone 2 through a sludge return port and is discharged partially through a sludge discharge pipe 9 b.
In this embodiment, the first-stage AO includes: the anaerobic zone 1, the aerobic zone 1 and the sedimentation zone 1, wherein the anaerobic zone 1 is provided with a stirrer 2a, an air pipe, a pH meter (not shown) and a dissolved oxygen meter (not shown); the aerobic zone 1 is provided with an aeration device 3a, 2 gas stripping devices, a gas-solid-liquid separation tank 4a, an air pipe, a pH meter and a dissolved oxygen meter; the bottom of the sedimentation zone 1 is provided with a plurality of sludge hoppers, sludge reflux ports and a sludge discharge pipe 9a, and the top is also provided with a water distribution pipe (canal), a horn-shaped water distributor 5a, a water outlet weir 6a and a water discharge pipe communication port T1 connected to the anoxic zone 2. The secondary AO includes: anoxic zone 2, aerobic zone 2 and sedimentation zone 2, anoxic zone 2 is equipped with stirrer 2b, air pipe, pH meter (not shown), dissolved oxygen meter (not shown). The aerobic zone 2 is provided with an aeration device 3b, a stripping device 1c, an air pipe, a pH meter (not shown), a dissolved oxygen meter (not shown), a gas-solid-liquid separation tank 4b, and valves (gates) 7c/7b/7a and metering devices 8c/8b/8a which are respectively connected to the sedimentation zone 2, the anoxic zone 2 (zone A2) and the anoxic zone 1 (zone A1). The air stripping device requires aerodynamic lifting of the air tube.
The first-stage AO in the device of the embodiment adopts short-cut nitrification and denitrification, thereby saving carbon sources, reducing the operation cost and being beneficial to the growth of anammox bacteria. In addition, the first-stage AO maintains an anoxic and low-oxygen environment, has high denitrification efficiency, is favorable for the hydrolytic acidification of refractory organic matters, and reduces the generation of foam during aeration. The two-stage AO has an inner mixed liquid reflux respectively, and has an outer mixed liquid reflux from the second-stage O to the first-stage A, thereby improving the nitrification and denitrification treatment effects of the wastewater and thoroughly removing nitrogen in the wastewater. The sedimentation integrated structure is adopted, the sludge concentration is high, the pool Rong Xiao under the same load is small in occupied area, the movable equipment is few, and the maintenance workload is small. The process is particularly suitable for denitrification treatment of high ammonia nitrogen wastewater, and can be used for treatment of coking wastewater, breeding wastewater, coal chemical wastewater, high-concentration leveling liquid wastewater and the like. In the anoxic zone 1, denitrifying bacteria convert nitrite nitrogen and nitrate nitrogen into nitrogen by utilizing organic matters to remove total nitrogen, thereby effectively completing denitrification reaction. In the aerobic zone 1, nitrosation bacteria convert ammonia nitrogen into nitrite nitrogen to carry out short-cut nitrification reaction, and meanwhile, partial anaerobic ammonia removal can be carried out by coupling anaerobic ammonia oxidation bacteria, the aeration device 3a of the aerobic zone 1 adopts flexible perforation aeration, the effective water depth of 7m-10m greatly improves the dissolved oxygen efficiency of a perforation aeration pipe, generally more than 20%, the perforation pipe is not easy to block, and the device is suitable for wastewater which is easy to scale in coal chemical industry, and the perforation aeration pipe has low cost, is easy to maintain and reduces equipment investment.
Next, a process of the above-described apparatus is described, which includes the steps of:
s1, raw water enters an anoxic zone 1, is mixed with mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter from an aerobic zone 1 and an aerobic zone 2, nitrate nitrogen is reduced into nitrogen under the action of denitrifying bacteria, denitrification is carried out, and simultaneously organic high polymer substances hydrolyze Cheng Yi biodegradable small molecular organic matters;
s2, enabling the wastewater treated in the anoxic zone 1 to enter the aerobic zone 1, performing short-range nitration reaction under the action of nitrosations, converting ammonia nitrogen into nitrite nitrogen, and degrading organic matters into CO 2 And H 2 O；
S3, a part of mixed liquor treated in the aerobic zone 1 flows back to the anoxic zone 1 for treatment through a gas stripping device 1a, and the other part of mixed liquor is lifted by a gas stripping device 1b to pass through a gas-liquid-solid separation tank 4a and then enters a precipitation zone 1 to be subjected to water distribution by a water distributor 5a for precipitation, supernatant liquid precipitated in the precipitation zone 1 enters an anoxic zone 2 through a water outlet weir 6a and a water outlet pipe T1 of the precipitation zone 1, and part of precipitated sludge flows back to the anoxic zone 1 through a sludge return port and is discharged through a sludge discharge pipe sludge discharge pump 9a or is discharged to the anoxic zone 2 so as to maintain the sludge concentration of the anoxic zone 2 and the aerobic zone 2;
s4, enabling the supernatant fluid after precipitation in the precipitation zone 1 to enter the anoxic zone 2, reducing nitrate nitrogen into nitrogen with the mixed fluid which synchronously enters and flows back from the aerobic zone 2, performing denitrification, and hydrolyzing Cheng Yi biodegradable micromolecular organic matters with organic high polymer substances;
s5, enabling the wastewater treated by the anoxic zone 2 to enter the aerobic zone 2, performing nitration reaction under the action of nitrifying bacteria, converting ammonia nitrogen into nitrate nitrogen, and degrading organic matters into CO 2 And H 2 O；
S6, lifting the mixed solution treated in the aerobic zone 2 by a gas stripping device 1c, and then respectively refluxing the mixed solution to the anoxic zone 1, the anoxic zone 2 and the sedimentation zone 2 after the mixed solution passes through a gas-liquid-solid separation tank 4 b; the water is distributed by the water distributor 5b and then is precipitated by the precipitation zone 2, the supernatant fluid after precipitation is discharged by the water outlet weir 6b and the drain pipe of the precipitation zone 2, part of the sludge after precipitation flows back to the anoxic zone 2 through the sludge return port, and the other part of the sludge is discharged by the sludge discharge pump 9b of the sludge discharge pipe.
Preferably, after S6, S1-S6 is repeated until the water quality of the aerobic zone 2 reaches the preset requirement, and the water is lifted by the gas stripping device 1c, passes through the gas-solid-liquid separation tank 4b, and is discharged through the water outlet weir 6b and the water discharge pipe of the sedimentation zone 2.
As a modification of the embodiment shown in FIG. 2, FIG. 3 is a schematic structural diagram of an integrated sedimentation internal-external mixed liquid backflow two-stage anoxic-aerobic device according to another embodiment of the present application, which is different from FIG. 2 in that a sedimentation zone is omitted in the first-stage AO, and the serial numbers of part of the features are the same as those in FIG. 2 for convenience of description,
the processing means may comprise a processor configured to process the processing data,
the anaerobic zone 1 and the aerobic zone 1, wherein a stirrer 2a is arranged in the anaerobic zone 1, the anaerobic zone 1 is communicated with the aerobic zone 1 through a pipeline 10a, an aeration device 3a and a gas stripping device 1a are arranged in the aerobic zone 1, the gas stripping device extends to the anaerobic zone 1, and a water outlet of the gas stripping device 1a is close to a raw water inlet side.
The anaerobic zone 2, the aerobic zone 2 and the sedimentation zone 2 between the anaerobic zone 2 are internally provided with a stirrer 2b, the anaerobic zone 2 and the aerobic zone 2 are communicated through a communicating pipe 10b, the aerobic zone 2 is provided with an aeration device 3b, a gas stripping device 1c is connected to a gas-solid-liquid separation tank 4b, the gas-solid-liquid separation tank 4b is provided with a first water outlet which is communicated to a water inlet side close to a raw water inlet through a valve (gate) 7a and a metering device 8a, a second water outlet which is communicated to the water inlet side of the anaerobic zone 2 through a valve (gate) 7b and a metering device 8b, a third water outlet which is communicated with a water distributor 5b of the sedimentation zone 2 through a valve (gate) 7c and a metering device 8c, and the sedimentation zone is provided with a sludge discharge pipe 9b for discharging residual sludge.
When the device is operated (with reference to fig. 3), raw water (wastewater) flows into the anoxic zone 1 from the water inlet, and when the inflow water reaches a certain height, the agitator 2a of the anoxic zone 1 is started for agitation based on the control system,
the water treated in the anoxic zone 1 flows into the anoxic zone 1 through a pipeline 10a through a hole arranged at the bottom of the anoxic zone 1, when the water flowing into the anoxic zone 1 reaches a certain height, the aeration device 3a is started based on the control system, when the mixed liquid treated in the anoxic zone 1 reaches the working liquid level, the gas stripping device 1a from the anoxic zone 1 to the aerobic zone 1 is started, and part of the mixed liquid flows back to the anoxic zone 1;
when the wastewater entering the anoxic zone 2 from the aerobic zone 1 through the communication port T1 reaches a certain height, a stirrer 2b of the anoxic zone 2 is started based on a control system to stir, the water treated by the anoxic zone 2 flows into the anoxic zone 2 through a hole 10b arranged at the bottom of the anoxic zone 2, when the water flowing into the aerobic zone 2 reaches a certain height, an aeration device 3b is started based on the control system, when the mixed liquid treated by the aerobic zone 2 reaches the working liquid level, a gas stripping device 1c of the aerobic zone 2 is started, the mixed liquid of the aerobic zone 2 is lifted, separated and released through a gas-liquid-solid separation tank 4b, and then the mixed liquid enters the sedimentation zone 2, the anoxic zone 2 and the anoxic zone 1 after being metered by a valve adjusting metering device. After entering the sedimentation zone 2, water is distributed by the water distributor 5b, supernatant fluid after sedimentation is discharged by the water outlet weir 6b and the drain pipe of the sedimentation zone 2, part of the sludge after sedimentation flows back to the anoxic zone 1 through the sludge return port, and the other part of the sludge is discharged through the sludge discharge pipe 9 b. The first-stage AO in this embodiment includes: the anaerobic zone 1 and the aerobic zone 1, wherein the anaerobic zone 1 is provided with a stirrer, an air pipe, a pH meter and a dissolved oxygen meter; the aerobic zone 1 is provided with an aeration device, 1 gas stripping device, an air pipe, a pH meter and a dissolved oxygen meter; the secondary AO comprises an anoxic zone 2, an aerobic zone 2 and a sedimentation zone 2 between the anoxic zone 2, wherein the anoxic zone 2 is provided with a stirrer, an air pipe, a pH meter and a dissolved oxygen meter. The aerobic zone 2 is provided with an aeration device, a gas stripping device, an air pipe, a pH meter, a dissolved oxygen meter, a gas-solid-liquid separation tank, and valves (gates) 7 and metering devices 8 respectively connected to the sedimentation zone, the anoxic zone 2, the anoxic zone 1 and the sedimentation zone 2. The bottom of the sedimentation zone is provided with a plurality of sludge hoppers, sludge reflux ports and a sludge discharge pipe 9, and the top of the sedimentation zone is also provided with a water distribution pipe (canal), a horn-shaped water distributor 5, a water outlet weir 6 and a water discharge pipe. The air stripping device 1 requires aerodynamic lifting of the air tube. When the device is operated, the alkali liquor adding and air quantity is automatically controlled according to the information detected by the control system, and the pH and DO are regulated. In this embodiment, based on the same horizontal plane, the liquid level of the anoxic zone 1 is higher than the liquid level of the aerobic zone 1, the liquid level of the aerobic zone 1 is higher than the anoxic zone, the liquid level of the sedimentation zone 2 is higher than the anoxic zone 2, and the liquid level of the anoxic zone 2 is higher than the liquid level of the aerobic zone 2. The sedimentation zone 2 is arranged between the anoxic zone 2 and the aerobic zone 2, and sludge precipitated in the sedimentation zone 2 directly flows back to the anoxic zone 2 through a communication port between the sedimentation zone 2 and the anoxic zone 2.
The device treatment process comprises the following steps:
s11, raw water enters an anoxic zone 1, is mixed with mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter from an aerobic zone 1 and an aerobic zone 2, and then the nitrate nitrogen is reduced into nitrogen under the action of denitrifying bacteria for denitrification, and meanwhile, organic high polymer substances hydrolyze Cheng Yi biodegradable micromolecular organic substances;
s12, enabling the wastewater treated by the anoxic zone 1 to enter the aerobic zone 1, performing short-range nitration reaction under the action of nitrosations, converting ammonia nitrogen into nitrite nitrogen, and degrading organic matters into CO 2 And H 2 O；
S13, refluxing a part of the mixed solution treated in the aerobic zone 1 to the anoxic zone 1 for treatment through the gas stripping device 1, and introducing a part of the mixed solution into the anoxic zone 2 through the communicated holes of the aerobic zone 1 and the anoxic zone 2 to reduce nitrate nitrogen into nitrogen under the action of denitrifying bacteria for denitrification, and hydrolyzing Cheng Yi biodegradable micromolecular organic matters by using organic high polymer substances;
s14, enabling the wastewater treated by the anoxic zone 2 to enter the aerobic zone 2, performing nitration reaction under the action of nitrifying bacteria, converting ammonia nitrogen into nitrate nitrogen, and degrading organic matters into CO 2 And H 2 O；
S15, lifting the mixed solution treated in the aerobic zone 2 by a gas stripping device 1c, and then respectively refluxing the mixed solution to the anoxic zone 1, the anoxic zone 2 and the sedimentation zone 2 after passing through a gas-liquid-solid separation tank 4 b; supernatant fluid after being precipitated in the precipitation zone 2 is discharged through a water outlet weir 6b and a drain pipe of the precipitation zone 2, part of precipitated sludge flows back to the anoxic zone 2 through a sludge return port, and the other part of the precipitated sludge is discharged through a sludge discharge pipe.
S11-S15 are repeated until the water quality of the aerobic zone 2 meets the preset requirement, and the water is lifted by the gas stripping device 1c, passes through the gas-solid-liquid separation tank 4b, and is discharged through the water outlet weir and the water discharge pipe of the sedimentation zone 2.
As a modification of the embodiment shown in fig. 3, as shown in fig. 4, a schematic structural diagram of an integrated sedimentation internal-external mixed liquid backflow two-stage anoxic-aerobic device according to another embodiment of the present application is shown, which is different from fig. 3 in that a sedimentation zone 2 in a two-stage AO is arranged between an anoxic zone 1 and an aerobic zone 1 under the condition of unchanged flow and function, so that the settled sludge directly flows back to the anoxic zone 1. The numbers for describing part of the features in the figure are the same as in fig. 3 for convenience. Fig. 5 is an example of a belt control system of the embodiment of fig. 4.
The processing device comprises:
the anoxic zone 1 and the aerobic zone 1, the anoxic zone 1 is internally provided with a stirrer 2a, the aerobic zone 1 is internally provided with an aeration device 3a, a gas stripping device 1a extends to the anoxic zone 1, the water outlet of the gas stripping device 1a is close to the water inlet side of the raw water inlet, the aerobic zone 1 is provided with a water outlet T1 (at a preset liquid level) which is communicated with the anoxic zone 2,
the anaerobic zone 2, the aerobic zone 2 and the sedimentation zone 2 are internally provided with a stirrer 2b, the anaerobic zone 2 is communicated with the aerobic zone 2 through a pipeline 10b, the aerobic zone 2 is provided with an aeration device 3b, a gas stripping device 1c is connected to a gas-solid-liquid separation tank 4b positioned on the upper side of the aerobic zone 2, the gas-solid-liquid separation tank 4b is provided with a first water outlet which is communicated with a water inlet side close to a raw water inlet through a valve (gate) 7a and a metering device 8a, a second water outlet which is communicated with a water inlet T1 side of the anaerobic zone 2 through the valve (gate) 7b and the metering device 8b, a third water outlet which is communicated with a water distributor 5b of the sedimentation zone 2 through the valve (gate) 7c and the metering device 8c, and the sedimentation zone 2 is provided with a sludge discharge pipe 9b so as to remove residual sludge. In this embodiment, the first-stage AO includes: the anaerobic zone 1 and the aerobic zone 1, wherein the anaerobic zone 1 is provided with a stirrer, an air pipe, a pH meter and a dissolved oxygen meter; the aerobic zone 1 is provided with an aeration device, 1 gas stripping device, an air pipe, a pH meter and a dissolved oxygen meter. The second-stage AO comprises an anoxic zone 2, an aerobic zone 2 and a sedimentation zone 2, wherein the sedimentation zone 2 is arranged between the anoxic zone 1 and the aerobic zone 1; the anoxic zone 2 is provided with a stirrer, an air pipe, a pH meter and a dissolved oxygen meter; the aerobic zone 2 is provided with an aeration device, a gas stripping device, an air pipe, a pH meter, a dissolved oxygen meter, a gas-solid-liquid separation tank, and valves (gates) 7 and metering devices 8 respectively connected to the sedimentation zone 2, the anoxic zone 2 and the anoxic zone 1. The air stripping device 1 requires aerodynamic lifting of the air tube. The bottom of the sedimentation zone is provided with a plurality of sludge hoppers, sludge reflux ports and a sludge discharge pipe 9, and the top of the sedimentation zone is also provided with a water distribution pipe (canal), a horn-shaped water distributor 5, a water outlet weir 6 and a water discharge pipe.
The treatment process when the device is operated comprises the following steps:
s21, raw water enters an anoxic zone 1, and is mixed with mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter from an aerobic zone 1 and an aerobic zone 2, the nitrite nitrogen and the nitrate nitrogen are reduced into nitrogen under the action of denitrifying bacteria, denitrification is carried out, and meanwhile, organic high molecular substances hydrolyze Cheng Yi biodegradable small molecular organic substances;
s22, enabling the wastewater treated by the anoxic zone 1 to enter the aerobic zone 1, performing short-range nitration reaction under the action of nitrosations, converting ammonia nitrogen into nitrite nitrogen, and degrading organic matters into CO 2 And H 2 O；
S23, allowing the mixed solution treated in the aerobic zone 1 to enter the anoxic zone 2 through a hole communicated with the aerobic zone 1 and the anoxic zone 2, reducing nitrate nitrogen into nitrogen under the action of denitrifying bacteria, performing denitrification, and hydrolyzing Cheng Yi biodegradable micromolecular organic matters by using organic high polymer substances;
s24, enabling the wastewater treated by the anoxic zone 2 to enter the aerobic zone 2, performing nitration reaction under the action of nitrifying bacteria, converting ammonia nitrogen into nitrate nitrogen, and degrading organic matters into CO 2 And H 2 O；
S25, lifting the mixed solution treated in the aerobic zone 2 by a gas stripping device 1c, and then respectively refluxing the mixed solution to the anoxic zone 1, the anoxic zone 2 and the sedimentation zone 2; supernatant fluid after precipitation in the precipitation zone 2 is discharged through a water outlet weir and a water discharge pipe of the precipitation zone, part of precipitated sludge flows back to the anoxic zone 1 through a sludge return port, and the other part of the precipitated sludge is discharged through a sludge discharge pipe.
Repeating S21-S25 until the water quality of the aerobic zone 2 reaches the preset requirement, lifting the water by the air stripping device, passing through the gas-solid-liquid separation tank, and discharging the water through the water outlet weir and the water discharge pipe of the sedimentation zone.
In the above embodiment, the first-stage precipitation, the second-stage precipitation, the precipitation zone 1 and the precipitation zone 2 are sometimes collectively referred to as precipitation zones, the first-stage anoxic zone, the second-stage anoxic zone, the anoxic zone 1 and the anoxic zone 2 are sometimes collectively referred to as anoxic zones, and the first-stage aerobic zone, the second-stage aerobic zone, the aerobic zone 1 and the aerobic zone 2 are sometimes collectively referred to as aerobic zones.
The foregoing embodiments are merely illustrative of the technical concept and features of the present application, and are intended to enable those skilled in the art to understand the content of the present application and implement the same according to the content of the present application, and are not intended to limit the scope of the present application. All modifications made in accordance with the spirit of the main technical solutions of the present application should be covered in the protection scope of the present application.
Claims (10)
1. The utility model provides an internal and external mixed solution backward flow two-stage anoxic-oxic device of integral type sediment, its characterized in that includes: a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone, a first aerobic zone and a first sedimentation zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, a second air stripping device is arranged in the first aerobic zone, the first air stripping device passes through a first gas-liquid-solid separation tank positioned in the first-stage AO treatment device, the first gas-liquid-solid separation tank is connected with a water distribution device of the first sedimentation zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: a second anoxic zone, a second aerobic zone and a second sedimentation zone,
a second stirring device is arranged in the second anoxic zone, and the second anoxic zone is communicated with a water outlet of the first precipitation zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the first-stage AO processing device and the second-stage AO processing device,
the second gas-liquid-solid separation tank is provided with: the first water outlet is communicated with the first anoxic zone, the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the second sedimentation zone.
2. The integrated sedimentation built-in internal and external mixed liquor backflow two-stage anoxic-aerobic device according to claim 1, which is characterized in that,
the first sedimentation zone is arranged between the first anoxic zone and the first aerobic zone, the first anoxic zone is communicated with the first aerobic zone through a pipeline, a water distributor is arranged in the first sedimentation zone, and the water distributor is communicated with the water outlet of the first gas-liquid-solid separation tank.
3. The integrated sedimentation built-in internal and external mixed liquor backflow two-stage anoxic-aerobic device according to claim 1, which is characterized in that,
the second sedimentation zone is arranged between the second anoxic zone and the second aerobic zone, and is internally provided with a water distributor which is communicated with a third water outlet of the second gas-liquid-solid separation tank.
4. The integrated sedimentation built-in internal and external mixed liquor backflow two-stage anoxic-aerobic device according to claim 3, which is characterized in that,
and a third stripping device is arranged in the second aerobic zone and extends to the water inlet side of the first anoxic zone through a second gas-liquid-solid separation tank.
5. The integrated sedimentation built-in internal and external mixed liquor backflow two-stage anoxic-aerobic device according to claim 4, which is characterized in that,
the second gas-liquid-solid separation tank is provided with three water outlets, the first water outlet is communicated with the first anoxic zone, the second water outlet is communicated with the second anoxic zone, and the third water outlet is communicated with the second sedimentation zone.
6. The integrated sedimentation built-in internal and external mixed liquid backflow two-stage anoxic aerobic device according to claim 5, wherein three water outlets of the second gas-liquid-solid separation tank are respectively provided with a water outlet pipe, and the water outlet pipes are respectively provided with a metering device and an adjusting device.
7. The utility model provides an internal and external mixed solution backward flow two-stage anoxic-oxic device of integral type sediment, its characterized in that includes: a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone and a first aerobic zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: a second anoxic zone, a second aerobic zone and a second sedimentation zone,
a second stirring device is arranged in the second anoxic zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the second aerobic zone,
the second gas-liquid-solid separation tank is provided with: a first water outlet communicated with the first anoxic zone;
the second water outlet is communicated with the second anoxic zone; and the third water outlet is communicated with the water distribution device in the second precipitation zone.
8. The utility model provides an internal and external mixed solution backward flow two-stage anoxic-oxic device of integral type sediment, its characterized in that includes: a first-stage AO processing device and a second-stage AO processing device which are cascaded,
the first-stage AO treatment device uses short-cut nitrification and denitrification, comprises a first anoxic zone, a first aerobic zone and a second sedimentation zone,
the first anoxic zone is provided with a water inlet, a first stirring device is arranged in the first anoxic zone,
a first air stripping device is arranged in the first aerobic zone and extends to the water inlet side of the first anoxic zone, the first aerobic zone is low in oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second-stage AO processing apparatus includes: a second anoxic zone and a second aerobic zone,
a second stirring device is arranged in the second anoxic zone, and the second anoxic zone is communicated with the water outlet of the first aerobic zone;
a third stripping device is arranged in the second aerobic zone and is connected with a second gas-liquid-solid separation tank positioned above the first-stage AO processing device and the second-stage AO processing device,
the second gas-liquid-solid separation tank is provided with 3 water outlets which are sequentially connected to the first anoxic zone, the second sedimentation zone and the second anoxic zone.
9. The integrated process for precipitating the built-in internal and external mixed liquid backflow two-stage anoxic and aerobic device is characterized by comprising the following steps of:
raw water enters a first anoxic zone and is mixed with mixed liquid containing nitrite nitrogen and nitrate nitrogen which synchronously enter from a first aerobic zone and a second aerobic zone, and the nitrite nitrogen and the nitrate nitrogen are reduced into nitrogen under the action of denitrifying bacteria to carry out denitrification treatment;
the wastewater treated by the first anoxic zone flows into a first aerobic zone, and short-range nitration reaction is carried out in a low-oxygen environment so as to convert ammonia nitrogen in the wastewater into nitrite nitrogen, and organic matters are degraded into CO 2 And H 2 O；
Part of the mixed liquid treated by the first aerobic zone flows back to the first anoxic zone for treatment through a first gas stripping device, and the other part of the mixed liquid is lifted by a second gas stripping device to pass through a first gas-liquid-solid separation tank and then enters a first sedimentation zone for sedimentation, supernatant liquid after sedimentation in the first sedimentation zone enters a second anoxic zone, and the sedimented sludge part flows back to the first anoxic zone through a sludge backflow port, and is partially discharged through a sludge discharge pipe or is discharged to the second anoxic zone;
the supernatant fluid flowing out of the first precipitation zone enters a second anoxic zone and is mixed with the mixed liquid which synchronously enters and flows back from a second aerobic zone to carry out denitrification reaction;
the wastewater treated by the second anoxic zone enters a second aerobic zone and enters under the action of nitrifying bacteriaPerforming nitration reaction to convert ammonia nitrogen into nitrate nitrogen, and degrading organic matters into CO 2 And H 2 O；
The mixed liquid treated in the second aerobic zone is lifted by a third gas stripping device and flows to the first anoxic zone, the second anoxic zone and the second sedimentation zone respectively after passing through a second gas-liquid-solid separation tank, the supernatant fluid precipitated in the second sedimentation zone is discharged through a water outlet weir and a water discharge pipe of the second sedimentation zone, and part of precipitated sludge flows back to the second anoxic zone through a sludge return port and is discharged through a sludge discharge pipe.
10. The process of an integrated sedimentation internal and external mixed liquor backflow two-stage anoxic and aerobic device according to claim 9, wherein the first aerobic zone is low oxygen, and the dissolved oxygen is 1-1.5 mg/L;
the second stripping device lifts the mixed liquid of the first aerobic zone to a first gas-solid-liquid separation tank, the mixed liquid enters a first sedimentation zone after being released, and the flow of the stripping device from the first aerobic zone to the first sedimentation zone is 3-5 times of the water inflow.
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| CN117585872A (en) * | 2024-01-19 | 2024-02-23 | 广州众行环保科技有限公司 | Two-stage AO integrated sewage treatment system |
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