CN211896257U - One-stage partial nitrosation-anaerobic ammonia oxidation microparticle sludge culture device - Google Patents
One-stage partial nitrosation-anaerobic ammonia oxidation microparticle sludge culture device Download PDFInfo
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Abstract
The utility model discloses a segmental part nitrosation-anaerobic ammonium oxidation microparticle mud culture apparatus, the device include aeration systems, water intake system, reactor, index monitoring system, temperature control system, and inoculation mud is arranged in the reactor after, continuous flow direction let in raw water and continuous aeration in the reactor, keep the micro-oxygen environment in making the reactor, and make mud mixes completely with intaking in the reactor, forms until ripe microparticle mud. The utility model has the advantages that: the device is simple, and the denitrification performance of the system is stable and effective; by using the method of controlling the DO concentration of the mixed liquid in the reaction unit and continuously improving the gas shearing force and the ammonia nitrogen load, the micro-granular sludge capable of realizing synchronous partial nitrosation and anaerobic ammonia oxidation is cultured, and the sedimentation performance of the micro-granular sludge is good.
Description
Technical Field
The utility model belongs to the technical field of water treatment, concretely relates to culture apparatus and method of a segmentation part nitrosation-anaerobic ammonium oxidation microparticle mud is applicable to the processing that contains ammonia nitrogen sewage.
Background
Because Anaerobic ammonia oxidation (Anammox) has the advantages of no need of organic carbon source, small sludge production and the like, the Anammox-based technology and process are widely concerned in the field of biological denitrification of wastewater. The technology is often coupled with the traditional denitrification technology, so that the denitrification efficiency is greatly improved. Among them, the Partial nitrosation-anammox Process (PNA) is the main way to treat municipal sewage. The process is mainly divided into two steps. First, Ammonia Oxidizing Bacteria (AOB) partially oxidize ammonia nitrogen to nitrite nitrogen in an aerobic or micro-aerobic state, and then, Anaerobic Ammonia Oxidizing Bacteria (AOB) oxidize the remaining ammonia nitrogen to generate nitrogen gas using nitrite nitrogen as an electron acceptor. The one-stage partial nitrosation-anaerobic ammonia oxidation (SPNA) process is short in flow, low in operation cost and small in occupied area, so that the process has advantages, and becomes a research hotspot in the field at home and abroad at present; the SPNA micro-particle sludge system has the advantages of no carbon source and low energy consumption, and has the characteristics of good sludge settling property, high microbial biomass and the like. In the SPNA micro-granular sludge, the AOB and the AnAOB are in division and cooperation to jointly realize autotrophic removal of the wastewater containing ammonia nitrogen. Firstly, the AOB on the micro-particles oxidizes ammonia nitrogen in water into nitrite nitrogen, and then the AnAOB on the micro-particles converts the ammonia nitrogen and the nitrite nitrogen into gaseous nitrogen, thereby realizing the autotrophic nitrogen removal process of sewage. In a one-section type partial nitrosation-anaerobic ammonia oxidation microparticle sludge system, AOB and AnAOB are symbiotic on microparticles through flocculation, and the product nitrite nitrogen of AOB can be quickly utilized by AnAOB, so that the reaction is quick, more importantly, the microparticles have good settling property, the sludge-water separation is simple and easy to operate, and the occupied area of a reactor is greatly reduced.
At present, the SPNA process can be realized by a suspended sludge method, a granular sludge method, and a biofilm method, and among them, the biofilm method is most widely used. The process of SPNA microparticles is very rare. From the literature published at present, culture of SPNA granular sludge is difficult, and therefore, it is necessary to develop a method and an apparatus for efficiently culturing SPNA micro-granular sludge.
Granular sludge is a granular aggregate formed by microorganisms through coagulation, and the operating conditions of the system (such as changes in the load of influent water, etc.) can affect the formation of sludge granules. The formation of granular sludge requires harsh conditions to form, such as: the reactor requires specific organic loading, hydraulic shear forces, nutrient content, hydraulic retention time operating modes, or the need to provide carriers, prevent interference of toxic substances, and the like. The hydraulic shearing force is too small to promote the formation of particles, and too large can destroy the particle structure; the provided nutrient components are mainly ammonia nitrogen, the culture effect of the SPNA micro-granular sludge with too low ammonia nitrogen is not good, free ammonia in the system can be increased when the ammonia nitrogen is too high, microorganisms in the reactor can be inhibited, and the whole reaction system can be even damaged when the ammonia nitrogen is serious. These conditions are also the focus of current research. Currently, although many studies have been made on the mechanism of granular sludge formation and a method for granular sludge formation, there is no apparatus or method for culturing granular sludge having a one-stage partial nitrosation-anammox function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a device and a method for culturing micro-granular sludge with partial nitrosation and anaerobic ammonia oxidation functions under the condition of continuous flow. In the device, the air supply quantity in the continuous flow reactor is controlled, so that the proper DO concentration is maintained, the proper hydraulic shearing force is maintained to promote the formation of the micro-granular sludge, the long-term stable operation of partial nitrosation and anaerobic ammonia oxidation is finally realized in the same continuous flow reactor, and the efficient and stable denitrification is finally realized.
In order to solve the technical problem, the utility model discloses a technical scheme is: a one-stage partial nitrosation-anaerobic ammonia oxidation microparticle sludge culture device comprises: the system comprises an aeration system, a water inlet system, a reactor, an index monitoring system and a temperature control system, wherein the aeration system comprises an aeration pump, a gas flowmeter and an air inlet pipe which are arranged in sequence; the water inlet system comprises a raw water bucket, a peristaltic pump and a connecting pipeline; the reactor comprises a reaction unit and a precipitation unit, wherein a vertical partition plate is arranged in the reaction unit, a partition plate is arranged between the reaction unit and the precipitation unit and communicated with the lower part of the reaction unit and the precipitation unit, and an inclined plate is arranged at the bottom of the precipitation unit in the reaction tank; the index monitoring system comprises a DO monitor positioned in the reaction unit and a pH monitor positioned in the precipitation unit, and the temperature control system comprises a constant temperature tank; one end of the air inlet pipe is positioned at the bottom in the reaction unit, and the precipitation unit is provided with a pipeline communicated with the constant temperature tank.
The reaction unit is provided with a vertical partition plate, the length of the partition plate is 0.5-0.6 times of the effective water depth of the reaction unit, and the distance between the partition plate and the bottom of the reaction unit is 0.4-0.5 times of the length of the partition plate.
The diameter of the air outlet of the air inlet pipe is 2-5 mm.
The inclination angle of the inclined plate is 60-70 degrees.
An air inlet pipe is arranged in the reaction unit and provides bubbles with the diameter of 2-6 mm, internal circulation gas is formed in the reaction unit, mixed liquid flows back and is fully mixed in the reaction unit under the driving action of the driving force of the internal circulation gas, the sedimentation unit is provided with an inclined plate, the inclination angle is 60-70 degrees, and therefore the sedimentation unit is used for separating mud and water and can prevent the loss of sludge when the initial settleability is poor; air is supplied to the bottom of the reaction zone by an aeration pump through a fixed air inlet pipe so as to provide continuous circular gas driving force and oxygen diffusion, the air supply amount is adjusted by a gas flowmeter, and raw water is transferred into the reactor through a peristaltic pump; the temperature of the mixed solution in the reactor was controlled to 30. + -. 1 ℃ by a constant temperature bath. The dissolved oxygen concentration of the mixed liquid in the reaction unit and the pH value of the water in the precipitation unit are measured regularly by using a dissolved oxygen monitor and a pH monitor. The pH of the water in the precipitation unit was maintained in the range of 8.0 ± 0.3 throughout the operation.
The utility model also provides a culture method of a sectional type partial nitrosation-anammox microparticle mud, it uses the culture apparatus of above-mentioned a sectional type partial nitrosation-anammox microparticle mud, including following step:
step one, sludge inoculation and starting: the method comprises the following steps of firstly inoculating suspended sludge with a traditional nitrification and denitrification function in a reactor, wherein the sludge concentration MLSS in a reaction unit is 3800-4500 mg/L; then adding anaerobic ammonia oxidation inoculated sludge to ensure that the sludge concentration in the reaction unit is MLSS to be 4000-5000 mg/L;
step two, an operation stage: after the inoculated sludge is placed in a reactor, raw water is continuously fed into the reactor and continuously aerated, the apparent ascending flow rate of gas in a reaction unit is 1.0-1.5 cm/s, the DO concentration of a mixed liquid in the reaction unit is 0.03-0.10 mg/L, the reactor is kept in a micro-aerobic environment, and the sludge in the reactor is completely mixed with inlet water until micro-granular sludge is formed.
Step one, the original operation process of the anaerobic ammonia oxidation inoculated sludge is an up-flow anaerobic sludge bed process, the anaerobic ammonia oxidation inoculated sludge is operated at the temperature of 30-32 ℃, the concentration of ammonia nitrogen of inlet water is 90-110 mg/L, DO is lower than 0.5mg/L, the sludge concentration of the anaerobic ammonia oxidation inoculated sludge is 7500-8500 mg/L, and the volume of the added inoculated sludge is 5-10% of the effective volume of a reaction unit.
And step two, the ammonia nitrogen concentration of the raw water is 100-400 mg/L, the total phosphorus concentration is 15-25 mg/L, and the average residence time of the raw water in the reactor is 6 h.
The ammonia nitrogen concentration of the raw water is gradually increased to 400mg/L from 100mg/L along with the running time.
On day 1-15, the ammonia nitrogen concentration of the raw water is 100 mg/L; on 15-35 days, the ammonia nitrogen concentration of the raw water is 150 mg/L; on 35-40 days, the ammonia nitrogen concentration of the raw water is 200 mg/L; on 40-110 days, the ammonia nitrogen concentration of the raw water is 250 mg/L; on 110-160 days, the ammonia nitrogen concentration of the raw water is 275 mg/L; day 160-180; the ammonia nitrogen concentration of the raw water is 300mg/L, and the ammonia nitrogen concentration of the raw water is 350mg/L in 180-195 days; and on 195-205 days, the ammonia nitrogen concentration of the raw water is 400 mg/L.
During the operation of the reactor, the apparent rising flow rate of the gas in the reaction unit is 1.0-1.5 cm/s, the DO concentration of the mixed solution is kept between 0.03-0.10 mg/L, the temperature is controlled at 30 +/-1 ℃, and the pH value of the water in the precipitation unit is kept at 8.0 +/-0.3.
After the inoculated sludge is placed in a reactor, continuously introducing raw water into the reactor and continuously aerating, wherein the mixed liquor can be completely mixed in the reaction unit under the driving action of the internal circulation gas driving force until micro-granular sludge is formed; the DO concentration of the mixed liquid in the reaction unit is controlled by controlling the air supply amount, so that the micro-oxygen environment is kept in the reaction unit, and the hydraulic shearing force in the reaction unit can be controlled within a certain range; the method for increasing the ammonia nitrogen concentration of raw water in a stepped manner is adopted, the water inlet nitrogen load of the reactor is gradually increased, the air supply quantity is gradually increased at the same time, the proper DO concentration of the mixed liquid in the reaction unit is maintained, the hydraulic shearing force is gradually increased, and the formation of the micro-granular sludge is accelerated; the culture method and the device can form the SPNA micro-granular sludge with the average grain diameter of 0.2-0.3 mm in 200 days, have good sedimentation performance, clear outline, ammonia nitrogen removal rate of more than 85 percent and total nitrogen removal rate of more than 75 percent, and are mature.
The utility model has the advantages that: by utilizing the method of controlling the DO concentration of the mixed liquid in the reaction unit and continuously improving the gas shearing force and the ammonia nitrogen load, the micro-granular sludge capable of realizing synchronous partial nitrosation and anaerobic ammonia oxidation is cultured, the granular sludge sedimentation performance is good, the device is simple, and the denitrification performance of the system is stable and effective.
Drawings
FIG. 1 is a schematic structural diagram of an SPNA micro-granular sludge reactor according to a first embodiment of the present invention;
FIG. 2 is a graph showing the distribution of the particle size of SPNA micro-granular sludge until day 90 in the second embodiment of the present invention;
FIG. 3 is a graph showing the distribution of the particle size of SPNA micro-granular sludge cultured up to the 205 th day in the second embodiment of the present invention;
FIG. 4 is a graph showing the variation of the operating particle size of the SPNA micro-granular sludge reactor in the second embodiment of the present invention;
FIG. 5 is a photograph of mature SPNA micro granular sludge in a second embodiment of the present invention;
FIG. 6 is an electron microscope image of mature SPNA micro granular sludge formed in the second embodiment of the present invention.
In the figure:
1. aeration pump 2, gas flowmeter 3, intake pipe
4. Raw water barrel 5, peristaltic pump 6 and DO monitor
7. pH monitor 8, thermostatic bath
I, a reaction unit II and a precipitation unit
Detailed Description
In order to make the technical field better understand the solution of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1, a one-stage partial nitrosation-anammox microparticle sludge culture apparatus comprises: the system comprises an aeration system, a water inlet system, a reactor, an index monitoring system and a temperature control system, wherein the reactor is provided with a reaction unit and a precipitation unit, the aeration system comprises an aeration pump, a gas flowmeter and an air inlet pipe, and the air inlet pipe is made of organic glass; the water inlet system comprises a raw water barrel and a peristaltic pump; the index monitoring system includes: DO monitor, pH monitor; the temperature control system is mainly a thermostatic bath.
The reaction unit is internally provided with an air inlet pipe which provides medium air bubbles for completely mixing mixed liquid in the reaction unit, and the precipitation unit is provided with an inclined plate, wherein the inclined angle of the inclined plate is 60-70 degrees. Under the driving action of the driving force of the internal circulation gas, the mixed liquid circularly flows in the reaction unit and is fully mixed.
Air is supplied to the bottom of the reaction unit by an aeration pump through a fixed air inlet pipe so as to provide continuous inner circulation gas driving force and oxygen diffusion. The amount of supplied air is regulated by a gas flowmeter. The raw water was transferred to the reaction unit by a peristaltic pump. The temperature of the mixed liquid in the reactor is mainly controlled by a water bath device of a constant temperature tank. The dissolved oxygen concentration of the mixed liquor in the reaction zone and the pH value of the water in the precipitation unit are periodically measured by using a dissolved oxygen monitor and a pH monitor.
The utility model discloses a method for culturing one-section type partial nitrosation-anaerobic ammonia oxidation microparticle sludge, which comprises the following steps:
1) sludge inoculation and start-up phase
The method comprises the steps of inoculating suspended sludge with the traditional nitrification and denitrification functions, and then inoculating anaerobic ammonia oxidation sludge to enable the sludge concentration MLSS of mixed liquor in a reaction unit to be 4000-5000 mg/L.
2) Phase of operation
After the inoculated sludge is placed in a reactor, raw water is continuously fed into the reactor in a flowing way and continuously aerated, so that the micro-aerobic environment is kept in the reactor, and the sludge in the reactor is completely mixed with the fed water until micro-granular sludge is formed.
Example 1
The utility model provides a partial nitrosation of a segmentation-anaerobic ammonium oxidation microparticle sludge culture apparatus, includes five parts of aeration systems, water intake system, reactor, index monitoring system, temperature control system, and aeration systems includes aeration pump, gas flowmeter, the intake pipe that concatenates and links to each other, and water intake system includes former cask and peristaltic pump, and the reactor includes reaction unit, precipitation unit, and index monitoring system includes DO monitor and pH monitor, and temperature control system is the constant temperature tank.
The reactor height is 700mm, the width is 500mm, the effective volume is 8L. Raw water is taken from a raw water tank 3 and transferred to the reaction unit by a peristaltic pump 4. When the aeration pump 1 starts to operate, air passes through the gas flowmeter 2, supplies air to the mixed liquid in the reaction unit through the air inlet pipe 3 to provide continuous inner circulation gas driving force and oxygen diffusion, so that the mixed liquid in the reaction unit is completely mixed, and the air supply amount is adjusted through the gas flowmeter 2. The sedimentation unit is provided with an inclined plate area, and the inclined angle of the inclined plate area is 60-70 degrees, so that sludge and water can be separated and sludge loss can be prevented. The dissolved oxygen concentration in the reaction unit and the pH value of the precipitation unit are monitored in real time by a dissolved oxygen monitor 6 and a pH monitor 7. The temperature of the mixed solution in the reaction cell was controlled by using the thermostatic bath 8 so that the temperature of the mixed solution in the reaction cell was maintained at 30. + -. 1 ℃.
Example 2
A one-stage partial nitrosation-anammox microparticle sludge culturing method using the one-stage partial nitrosation-anammox microparticle sludge culturing apparatus of example 1, comprising the steps of:
in a reactor of the device, 7300mL of suspended sludge with MLSS of 4300mg/L and the traditional nitrification and denitrification functions is inoculated, and 700mL of anaerobic ammonia oxidation sludge with MLSS of 8000mg/L is inoculated. The raw water is self-prepared, the ammonia nitrogen concentration is 100-400 mg/L, the total phosphorus concentration is 15-25 mg/L, and after the inoculated sludge is placed into the reactor, the raw water enters from the upper part of a reaction unit of the reactor. The average residence time of the raw water in the reactor is 6h, namely the water inlet in the reactor is renewed 4 times per day. And (2) introducing raw water into the reactor and continuously supplying gas, wherein the apparent ascending flow rate of gas in the reaction unit is within the range of 1.0-1.5 cm/s, so that the mixed liquid in the reaction unit is kept in a micro-aerobic environment (DO is 0.03-0.06 mg/L), and the mixed liquid is completely mixed in the reaction unit under the driving action of the driving force of the internal circulation gas. There was no significant increase in sludge particle size by day 110, as shown in figure 2. At 110 days, SPNA micro-granular sludge is preliminarily formed in the reactor, and the average grain diameter is 0.15 mm; in 160-180 days, the ammonia nitrogen concentration is 300mg/L, the particle size of the SPNA micro-particle sludge is gradually increased, and the sedimentation performance is further improved; in 180-195 days, the ammonia nitrogen concentration is 350mg/L, and the particle size of the SPNA micro-particle sludge is further increased; on 195-205 th days, the ammonia nitrogen concentration of the raw water is 400mg/L, and the total amount of the sludge is 41% of the micro-granular sludge with the grain size of 0.50-0.84 mm shown in figure 3; and the average particle size of the sludge is increased to 247 μm, mature SPNA micro-granular sludge is formed in the reactor, as shown in fig. 4.
FIG. 5 shows mature SPNA granular sludge formed by the culture in this example. The shape of the particles is round or oval, and the color of the particles is red. FIG. 6 is an electron microscope image of the granular sludge, which shows that the surface of the granular sludge is full of pores, which is beneficial to nutrient transfer and microbial metabolism. Dissolved oxygen enters the interior of the particles enriched with the AnAOB through mass transfer from the outer surface of the AOB-enriched granular sludge to form a dissolved oxygen gradient, an aerobic zone is formed outside the granular sludge, and a facultative or anoxic zone is formed inside the granular sludge, so that the microbial denitrification performance is enhanced.
After the micro-particle sludge is successfully cultured, the removal rate of the total nitrogen of the raw water in the operation stable period can reach more than 80 percent, and the removal rate of the ammonia nitrogen can reach more than 90 percent.
The SPNA micro-granular sludge culture method and the culture device provided by the utility model are described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (4)
1. A one-stage partial nitrosation-anammox microparticle sludge culture device is characterized by comprising: the system comprises an aeration system, a water inlet system, a reactor, an index monitoring system and a temperature control system, wherein the aeration system comprises an aeration pump (1), a gas flowmeter (2) and an air inlet pipe (3) which are arranged in sequence; the water inlet system comprises a raw water barrel (4), a peristaltic pump (5) and a connecting pipeline; the reactor comprises a reaction unit (I) and a precipitation unit (II), a partition plate is arranged between the reaction unit (I) and the precipitation unit (II) and is communicated with the lower part of the reaction unit (I) and the precipitation unit (II), and an inclined plate is arranged at the bottom of the precipitation unit (II) in the reaction tank; the index monitoring system comprises a DO monitor (6) positioned in the reaction unit (I) and a pH monitor (7) positioned in the precipitation unit (II), and the temperature control system comprises a constant temperature tank (8); one end of the air inlet pipe (3) is located at the bottom of the reaction unit (I), and the precipitation unit (II) is provided with a pipeline communicated with the thermostatic bath (8).
2. The one-stage partial nitrosation-anammox microparticle sludge culture apparatus according to claim 1, wherein the reaction unit (i) is provided with a vertical partition plate, the length of the partition plate is 0.5-0.6 times of the effective water depth of the reaction unit, and the distance from the partition plate to the bottom of the reaction unit is 0.4-0.5 times of the length of the partition plate.
3. The one-stage partial nitrosation-anammox microparticle sludge culture apparatus according to claim 1 or 2, wherein the inclination angle of the inclined plate is 60 to 70 °.
4. The one-stage partial nitrosation-anammox microparticle sludge culture apparatus according to claim 1, wherein the diameter of the air outlet hole of the air inlet pipe (3) is 2-5 mm.
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