CN211470926U - Denitrifying phosphorus removal sludge culture system - Google Patents
Denitrifying phosphorus removal sludge culture system Download PDFInfo
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- CN211470926U CN211470926U CN201922202477.9U CN201922202477U CN211470926U CN 211470926 U CN211470926 U CN 211470926U CN 201922202477 U CN201922202477 U CN 201922202477U CN 211470926 U CN211470926 U CN 211470926U
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Abstract
The utility model discloses a denitrification dephosphorization sludge culture system. The system comprises: a water inlet tank, a CASS reactor and a water drainage tank; a first partition plate is arranged in the CASS reactor and divides the interior of the CASS reactor into a biological selection area and a main reaction area; the bottom of the first partition plate is provided with a through hole so as to communicate the biological selection area with the main reaction area and ensure that the muddy water mixed liquor automatically flows into the main reaction area from the biological selection area; the biological selection area of the CASS reactor is provided with a water inlet, and the main reaction area is provided with a water outlet; the water inlet is connected with the water inlet tank through a water inlet pipeline, and a water inlet pump is arranged on the water inlet pipeline; the water outlet is connected with the drainage box through a drainage pipeline; a cover plate for sealing is arranged at the top of the biological selection area; and the cover plate is provided with a vent hole. The utility model discloses can regard as the processing object with low nitrogen source actual domestic sewage, realize the fast and stable enrichment of denitrification dephosphorization mud.
Description
Technical Field
The utility model relates to a sewage treatment technical field, concretely relates to denitrification dephosphorization sludge culture system.
Background
In 2015, ten water releases put higher requirements on the nitrogen and phosphorus treatment capacity of urban sewage treatment facilities, nitrogen and phosphorus removal is still an important problem faced by sewage treatment processes, new technologies such as denitrification and phosphorus removal technologies become hot points of research in recent years, the technology focuses on microorganisms of denitrifying phosphorus removal bacteria, the microorganisms can realize synchronous nitrogen and phosphorus removal in an anoxic environment, the characteristic of one-carbon dual-purpose is achieved, the oxygen demand and the sludge yield can be reduced, and the technology has important research and application values for energy conservation and emission reduction in the field of sewage treatment. At present, denitrification dephosphorization technology is mostly in the laboratory research stage, and a long way is still needed to realize better application.
In practical application, the CASS process and the CAST process have good removal efficiency on nitrogen and phosphorus removal, particularly phosphorus removal, and important research and application values are provided for creating an anaerobic/anoxic/aerobic alternative environment suitable for the survival of denitrifying phosphorus removal bacteria as far as possible by modifying the CASS process and adapting to the characteristics of actual domestic sewage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a denitrification dephosphorization sludge culture system. The utility model discloses improve traditional CASS process units and flow to low nitrogen source actual domestic sewage is as the raw water, is favorable to creating the good condition of the quick enrichment of denitrification dephosphorization mud, is favorable to improving the stability of CASS reactor operation.
In order to realize the above purpose, the utility model adopts the following technical scheme:
the utility model discloses an aspect provides a denitrification dephosphorization sludge culture system, and this system includes: a water inlet tank, a CASS reactor and a water drainage tank;
a first partition plate is arranged in the CASS reactor and divides the interior of the CASS reactor into a biological selection area and a main reaction area; the bottom of the first partition plate is provided with a through hole so as to communicate the biological selection area with the main reaction area and ensure that the muddy water mixed liquor automatically flows into the main reaction area from the biological selection area; the biological selection area of the CASS reactor is provided with a water inlet, and the main reaction area is provided with a water outlet;
the water inlet is connected with the water inlet tank through a water inlet pipeline, and a water inlet pump is arranged on the water inlet pipeline; the water outlet is connected with the drainage tank through a drainage pipeline, and the outlet water enters the drainage tank through self-flow;
a cover plate for sealing is arranged at the top of the biological selection area; and the cover plate is provided with a vent hole.
The cover plate can reduce the influence of oxygen in the air on the anoxic environment of the biological selection area.
Preferably, a second partition plate is further arranged at the bottom of the main reaction zone at a preset distance close to the partition plate; the height of the second partition board is higher than that of the through hole at the bottom of the first partition board.
The second partition board can reduce the influence of dissolved oxygen in the main reaction zone on the anoxic environment of the biological selection zone in the aeration stage.
In the scheme, the biological selection area is favorable for ensuring a better anaerobic and anoxic environment and is favorable for screening denitrifying phosphorus removal bacteria by additionally arranging the cover plate and the partition plate.
In a preferred embodiment of the present invention, preferably, an aeration device is installed at the bottom of the half edge of the main reaction zone away from the biological selection zone; the aeration device comprises a microporous aeration head and a gas rotameter, wherein the microporous aeration head controls the content of dissolved oxygen through the gas rotameter.
In the preferred scheme, the aeration position and the dissolved oxygen concentration of the main reaction zone are controlled, so that a certain anoxic growth environment is created for microorganisms in the zone while high oxidation efficiency is ensured, and enrichment of denitrifying phosphorus removal bacteria is facilitated.
Preferably, the bioselection zone and the main reaction zone are both provided with stirring means.
Preferably, the stirring device is a constant-speed stirrer, and the constant-speed stirrer comprises two stirring blades which are distributed up and down.
Preferably, the drain pipeline is provided with an electromagnetic valve.
Preferably, the CASS reactor is provided with a return port; the backflow port is connected to a water inlet pipeline between the water inlet pump and the water inlet through a backflow pipeline, and the backflow pipeline is provided with a backflow pump.
And returning the mud-water mixture or the sludge in the main reaction area to the biological selection area through a return pump.
Preferably, the CASS reactor is provided with a heating device; for keeping the temperature constant in the CASS reactor.
Preferably, the CASS reactor outer wall is wrapped with an electrical heating tape.
In a preferred embodiment of the present invention, preferably, the system further comprises an automatic control device, wherein the automatic control device comprises an intelligent timer; the intelligent timer is respectively connected with the water inlet pump, the aeration device, the stirrer, the electromagnetic valve, the reflux pump and the heating device.
The system in the preferred scheme completely runs in a self-control mode, and the stirring speed and the aeration rate are controlled, so that manpower and material resources are saved, and the running cost is reduced.
The utility model discloses another aspect provides a denitrification dephosphorization sludge culture method that uses above system to go on, includes following step:
inoculating activated sludge to a CASS reactor for enrichment culture, wherein the CASS reactor is operated in a sequencing batch mode for 4 periods a day, and the time of each period is 360 min;
wherein, the period of initial water inflow of the biological selection area is 10min (namely, water injection is performed for 10min initially in each period), the whole process is stirred, the inflow of the CASS reactor and the return sludge enter from the water inlet of the biological selection area after being mixed by a water inlet pipeline, the sludge return rate is 20 percent, and the whole process returns;
the main reaction zone has the following operation modes: anaerobic stirring for 45min, stopping stirring for aerobic reaction for 45min, stirring for 45min under oxygen deficiency condition, stopping stirring for aerobic reaction for 135min, precipitating for 60min, and draining for 30 min; the main reaction zone discharges sludge at regular time every day, so that the sludge age is controlled to be about 16 d.
The utility model discloses an in the preferred scheme provides a denitrification dephosphorization sludge culture method, including following step:
inoculating activated sludge to a CASS reactor for enrichment culture, wherein the CASS reactor is operated in a sequencing batch mode for 4 periods a day, and the time of each period is 360 min;
wherein, the period of the biological selection area is initially fed with water for 10min, the whole process is stirred, the water fed into the CASS reactor and the return sludge are mixed by a water inlet pipeline and then enter from a water inlet of the biological selection area, the sludge reflux rate is 20 percent, and the whole process is refluxed;
the main reaction zone has the following operation modes: anaerobic stirring for 45min, stopping stirring for aerobic reaction for 45min, stirring for 45min under oxygen deficiency condition, stopping stirring for aerobic reaction for 135min, precipitating for 60min, and draining for 30 min; the main reaction zone discharges sludge at regular time every day, so that the sludge age is controlled to be about 16 d.
Preferably, the activated sludge is flocculent activated sludge from a biochemical pool of a sewage plant; the suspended solid concentration of the mixed solution after inoculation is 7000-7500 mg.L-1Left and right.
The water treated by the system is low-nitrogen source domestic sewage (namely raw water in a water inlet tank), and the water quality is as follows: COD is 205.6-256.4 mg.L-1The ammonia nitrogen is 38.2-42.9 mg.L-1Nitrate nitrogen of 0.01-6.82 mg.L-1TP is 5.38-9.49 mg.L-1The pH value is 7-8;
the water filling ratio of the CASS reactor is set to 1/3, the temperature is maintained at about 26-28 ℃, and the Dissolved Oxygen (DO) on the rightmost side of the main reaction zone away from the biological selection zone in the aerobic stage is maintained at 2-3 mg.L-1And the concentration gradient with the decreasing trend is formed in the main reaction zone from right to left by controlling the gas rotameter, so that the DO concentration at the junction position of the biological selection zone and the main reaction zone is in a lower level.
Preferably, the stirring speed of the biological selection area is 120-150 r.min-1。
The utility model takes the low nitrogen source actual domestic sewage as raw water, and the enriched denitrifying phosphorus removal sludge is closer to the actual situation. By controlling the aeration position and the dissolved oxygen concentration of the main reaction zone, a certain anoxic growth environment is created for microorganisms in the zone while high oxidation efficiency is ensured, and enrichment of denitrifying phosphorus removal bacteria is facilitated.
Compared with the conventional CASS process or the denitrification phosphorus removal bacteria enrichment process, the utility model has the advantages that: 1. the biological selection area of the reaction device is additionally provided with the cover plate and the partition plate, so that the better anaerobic and anoxic environment of the reaction device is ensured, and the screening of denitrifying phosphorus removal bacteria is facilitated; 2. by controlling the aeration position and the dissolved oxygen concentration of the main reaction zone, a certain anoxic growth environment is created for microorganisms in the zone while high oxidation efficiency is ensured, and enrichment of denitrifying phosphorus removal bacteria is facilitated; 3. the utility model completely operates in an automatic control mode, and the stirring speed and the aeration rate are controlled, thereby being beneficial to saving manpower and material resources and reducing the operation cost; 4. the utility model takes the low nitrogen source actual domestic sewage as raw water, and the enriched denitrifying phosphorus removal sludge is closer to the actual situation.
Drawings
FIG. 1 is a schematic structural diagram of a denitrification dephosphorization sludge culture system in a preferred embodiment of the present invention.
The reference numbers illustrate:
1. a water inlet tank; 2. a water inlet pump; 3. a vent hole; 4. a water inlet; 5. a biological selection area; 6. a cover plate; 7. a first clapboard; 8. a second clapboard; 9. a blender; 10. a primary reaction zone; 11. a reflux pump; 12. an electromagnetic valve; 13. a water outlet; 14. a drainage tank 15 and a return port.
Detailed Description
In order to illustrate the invention more clearly, the invention is further described below with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The utility model provides a preferred embodiment, as shown in figure 1, this denitrification dephosphorization sludge culture system is including intaking case 1, CASS reactor, water drainage tank 14, intakes case 1 and is used for intaking to the CASS reactor through intake pump 2. The CASS reactor is mainly divided into a biological selection area 5 and a main reaction area 10 by a first partition plate 7, and a square hole is formed in the lower portion of the first partition plate 7 so as to ensure that muddy water mixed liquor automatically flows into the main reaction area 10 from the biological selection area 5; the right side of the first partition plate 7 is provided with a second partition plate 8 to reduce the influence of dissolved oxygen in the main reaction zone 10 on the anoxic environment of the biological selection zone 5 in the aeration stage; a cover plate 6 is arranged above the biological selection area 5, and an air vent 3 is arranged above the biological selection area to reduce the influence of oxygen in the air on the anoxic environment of the biological selection area 5; the bottom of the right half part of the main reaction zone 10 is provided with a microporous aeration head, and the aeration head controls the content of dissolved oxygen through a gas rotameter; the biological selection area 5 and the main reaction area 10 are both provided with a constant speed stirrer 9, and stirring blades of the constant speed stirrer are composed of an upper part and a lower part; an electromagnetic valve 12 for controlling drainage is arranged on a drainage pipe of the CASS reactor, and effluent enters a drainage tank 14 through self-flowing; the CASS reactor is provided with a return port 15 in a main reaction area, and a mud-water mixture or sludge in the main reaction area 10 is returned to the biological selection area 5 through a return pump 11; an electric heating belt is wound on the outer wall of the CASS reactor and used for keeping the temperature in the CASS reactor constant; all the pumps, the stirrer, the aeration device and the electromagnetic valve are controlled by an intelligent timer, so that the automatic control of the system is realized.
The low nitrogen source actual domestic sewage is used as raw water, and the water quality of the raw water is as follows: COD is 205.6-256.4 mg.L-1The ammonia nitrogen is 38.2-42.9 mg.L-1Nitrate nitrogen of 0.01-6.82 mg.L-1TP is 5.38-9.49 mg.L-1The pH value is 7-8. Inoculating the activated sludge in the biochemical pool of the sewage plant into the CASS reactor.
The CASS reactor was run for 4 cycles a day with each cycle time of 360 min.
Wherein the biological selection area is stirred in the whole process (the period is initial water inlet for 10min), and the stirring speed is 150 r.min-1The water inlet of the CASS reactor and the return sludge enter from the water inlet of the biological selection area after being mixed for a short time through the water inlet pipe, the sludge loop ratio is 20 percent, and the sludge returns in the whole process.
The main reaction zone has the following operation modes: anaerobic stirring for 45min, aerobic reaction (stopping stirring) for 45min, anoxic stirring for 45min, aerobic reaction (stopping stirring) for 135min, precipitating for 60min, and draining for 30 min.
Setting reaction conditions:the temperature of the reactor temperature controller is set to be 28 ℃, the water filling ratio is set to be 1/3, the sludge age is controlled to be 16d, the sludge reflux ratio is set to be 20 percent, the sludge is continuously refluxed in the whole process, and the stirring speed is 150 r.min-1The sludge concentration of the mixed liquid is maintained at 6000-7000 mg.L-1The rightmost Dissolved Oxygen (DO) of the main reaction zone in the aerobic stage is maintained at 2-3 mg.L-1And the concentration gradient of the main reaction zone is gradually decreased from right to left to control the DO concentration at the junction of the biological selection zone and the main reaction zone<1.0mg·L-1。
The operation of the reactor is controlled by an intelligent timer, and sewage is firstly mixed with return sludge in the water inlet pipe for a short time, then enters the biological selection area and then enters the main reaction area. The stirrer and the aeration device are repeatedly started and stopped according to the preset setting, the main reaction zone finishes the environmental change of anaerobic reaction, aerobic reaction, anoxic reaction, aerobic reaction and sedimentation reaction, and finally the drained water flows into the water outlet tank by means of gravity to finish the operation of one period.
Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.
Claims (10)
1. A denitrification dephosphorization sludge culture system is characterized by comprising: a water inlet tank, a CASS reactor and a water drainage tank;
a first partition plate is arranged in the CASS reactor and divides the interior of the CASS reactor into a biological selection area and a main reaction area; the bottom of the first partition plate is provided with a through hole so as to communicate the biological selection area with the main reaction area and ensure that the muddy water mixed liquor automatically flows into the main reaction area from the biological selection area; the biological selection area of the CASS reactor is provided with a water inlet, and the main reaction area is provided with a water outlet;
the water inlet is connected with the water inlet tank through a water inlet pipeline, and a water inlet pump is arranged on the water inlet pipeline; the water outlet is connected with the drainage box through a drainage pipeline;
a cover plate for sealing is arranged at the top of the biological selection area; and the cover plate is provided with a vent hole.
2. The denitrification dephosphorization sludge culture system according to claim 1, wherein a second partition plate is further arranged at the bottom of the main reaction zone at a predetermined distance from the partition plate; the height of the second partition board is higher than that of the through hole at the bottom of the first partition board.
3. The denitrification dephosphorization sludge culture system according to claim 1, wherein an aeration device is installed at the bottom of the half edge of the main reaction zone far away from the biological selection zone; the aeration device comprises a microporous aeration head and a gas rotameter, wherein the microporous aeration head controls the content of dissolved oxygen through the gas rotameter.
4. The denitrification dephosphorization sludge culture system according to claim 1, wherein the biological selection zone and the main reaction zone are provided with stirring devices.
5. The denitrification dephosphorization sludge culture system according to claim 4, wherein said stirring device is a constant speed stirrer, said constant speed stirrer comprises two stirring blades distributed up and down.
6. The denitrification dephosphorization sludge culture system according to claim 1, wherein an electromagnetic valve is arranged on the drainage pipeline.
7. The denitrification dephosphorization sludge culture system according to claim 1, wherein the CASS reactor is provided with a return port; the backflow port is connected to a water inlet pipeline between the water inlet pump and the water inlet through a backflow pipeline, and the backflow pipeline is provided with a backflow pump.
8. The denitrification dephosphorization sludge culture system according to any one of the claims 1-7, wherein said CASS reactor is provided with a heating device.
9. The denitrification dephosphorization sludge culture system according to claim 8, wherein an electrical heating belt is wound on the outer wall of the CASS reactor.
10. The denitrification dephosphorization sludge culture system according to claim 8, further comprising an automatic control device, wherein said automatic control device comprises an intelligent timer;
the intelligent timer is respectively connected with the water inlet pump, the aeration device, the stirrer, the electromagnetic valve, the reflux pump and the heating device.
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| CN110818086A (en) * | 2019-12-10 | 2020-02-21 | 中冶京诚工程技术有限公司 | Denitrifying phosphorus removal sludge culture system and method |
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