CN210595460U - Combined device of denitrification-nitrosation-anaerobic ammonia oxidation - Google Patents
Combined device of denitrification-nitrosation-anaerobic ammonia oxidation Download PDFInfo
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Abstract
The utility model provides a denitrification-nitrosation-anaerobic ammonia oxidation composite set, include: the denitrification reactor is used for receiving sewage and backflow sewage in the raw water pool, performing denitrification by using organic matters in the raw water and nitrate nitrogen in backflow liquid, and enabling the outflow water to flow to the nitrosation reactor or respectively flow to the nitrosation reactor and the anaerobic ammonia oxidation reactor; the nitrosation reactor is used for receiving the denitrification effluent, removing organic matters through aeration and oxygen supply, realizing nitrosation through coupling control of free ammonia and free nitrous acid, and enabling the effluent to flow to the anaerobic ammonia oxidation reactor; and the anaerobic ammonia oxidation reactor receives the nitrosation effluent or simultaneously receives the denitrification effluent and the nitrosation effluent, autotrophic nitrogen removal is carried out in the anaerobic ammonia oxidation process, part of the effluent flows back to the denitrification reactor, and the other parts are discharged. The denitrification-nitrosation-anaerobic ammonia oxidation combined process realizes the maximization of the processing load of the process operation by optimizing functional bacteria; the stable and efficient operation of the process is realized while the denitrification effect is ensured.
Description
Technical Field
The utility model relates to a waste water treatment technical field especially relates to a denitrification-nitrosation-anaerobic ammonia oxidation composite set.
Background
The landfill leachate, the excess sludge anaerobic digestion solution and the like both contain ammonia nitrogen with higher concentration and organic carbon sources with lower concentration. In a sewage treatment plant, the reflux of anaerobic digester effluent to the main sewage treatment process can result in an increase in the overall process nitrogen load of 3-30%. When the traditional biological nitrification and denitrification process is adopted to treat the wastewater, a large amount of energy is consumed in the nitrification process to supply oxygen, the alkalinity is reduced, and the operation stability of the biological treatment process is influenced. Meanwhile, the content of the organic carbon source in the sewage is low, so that the denitrification efficiency is limited. If an external carbon source is added in the denitrification process, the operation cost is increased, and economic and effective denitrification can not be realized. Therefore, the treatment of high ammonia nitrogen and low carbon sewage is mainly based on short-cut nitrification, such as shanroron and short-cut nitrosation-anaerobic ammonia oxidation. The key to such treatment processes is the achievement of short-cut nitrification, i.e., nitrosation. Therefore, the development of a high-efficiency nitrosation technology for low-carbon high-ammonia nitrogen wastewater is needed. For a completely mixed single-sludge sewage treatment system, different functional bacteria survive in the same environment, and various functional microorganisms cannot be guaranteed to grow under the optimal environmental conditions. For example, when nitrifying bacteria and denitrifying bacteria grow in a single sludge system, the growth rate of the denitrifying bacteria is higher than that of the nitrifying bacteria, so that the growth of the nitrifying bacteria is inhibited; meanwhile, in order to maintain the nitrification efficiency, the denitrifying bacteria are in a endogenous respiration state in a staged manner. When the bacteria-cultivating activity exists, the nitrifying flora activity is influenced, so that N in the nitrifying process is caused2An increase in the amount of O released. If the sludge-separating sewage treatment process is adopted, nitrifying bacteria, denitrifying bacteria and the like are acclimated in different reactors, so that the optimal growth of denitrification and nitrification in respective systems is promoted, and the treatment of different floras is favorably realizedCapacity and maximum efficiency.
In the past, the low-ammonia nitrogen load operation mode is mostly adopted for treating the low-carbon high-ammonia nitrogen wastewater. According to the theory of ecology, each type of functional bacteria can be divided into two types of microbial populations with rapid growth and high affinity to substrates, namely r or K growth strategies. The microorganism of the r-growth strategy has higher reaction rate, higher half saturation constant value and fast cell proliferation speed, and can adapt to higher substrate concentration. Whereas the K-growth strategy microorganisms have a lower reaction rate and a lower half-saturation constant value. For the nitrification process, nitrifying bacteria of a K-growth strategy are domesticated mainly under the conventional low-load operation condition. Therefore, based on the r/K theory, in order to realize rapid and efficient nitration reaction conditions, nitrifying bacteria with an r-growth strategy can be domesticated under a high-load condition, and how to realize nitrosation is researched. Shortcut nitrification can be achieved by controlling parameters such as Dissolved Oxygen (DO), sludge age (SRT), Hydraulic Retention Time (HRT), pH, temperature (T) or substrate concentration, etc. Because the affinity of NOB to oxygen is lower than that of AOB, the low DO concentration is beneficial to the competition of AOB, and NOB is eliminated to realize NO2-N accumulation. Abeling and Seyfried (1992) found that Free Ammonia (FA) concentrations of 1-5mg/L inhibited NOB activity and AOB activity was less inhibited. Intermittent aeration has different delay characteristics based on AOB and NOB, realizes nitrite accumulation, has the advantages of simple control and the like, and is widely researched. Under the condition of high-load operation, the research on the control of the nitrosation of the high-ammonia nitrogen wastewater by the nitrifying bacteria adopting the r growth strategy is relatively less, and needs to be further researched.
The key to short-cut nitrification is to inhibit Nitrite Oxidizing Bacteria (NOB) while maintaining the activity of Ammonia Oxidizing Bacteria (AOB). Both AOB and NOB are aerobic bacteria, but the affinity and oxygen consumption rate of AOB to Dissolved Oxygen (DO) are stronger than those of NOB, so that AOB is easy to enrich under the condition of lower DO, NOB is eliminated to realize NO2 --accumulation of N. However, when activated sludge is acclimated under low-DO conditions for a long period of time, NOB becomes adaptive to the low-DO conditions, resulting in instability of the shortcut nitrification system. Therefore, to achieve stable nitrosation, a combination of low DO control and other factors must be controlled. By using SBR tools with high concentration gradientsHigh NH content in process treatment of high ammonia nitrogen wastewater4 +The N concentration will generate higher concentrations of Free Ammonia (FA), NO2 -Accumulation of-N results in the formation of Free Nitrous Acid (FNA). FA is used as a substrate of AOB, has smaller inhibition effect on AOB than NOB, starts to inhibit the AOB when the concentration of FA is 10-150mg/L, and starts to inhibit the NOB when the concentration of FA is 0.1-1.0 mg/L; the inhibition effect of FNA on nitrobacteria starts when the concentration of FNA is 0.22-2.8mg/L, but the inhibition effect of FNA on NOB is stronger than that of AOB. While low DO is an important control factor in achieving nitrosation, most researchers believe that low DO results in higher N2And releasing the O. Furthermore, the use of higher concentration gradients, especially high FNA concentrations, to achieve shortcut nitrification, may promote N2And releasing the O. Therefore, how to control the concentration of DO, FA and FNA, high AOB activity is kept while high-efficiency nitrosation is realized, and greenhouse gas N in the process can be avoided2O release, which requires further investigation.
Anaerobic ammonia oxidation (Anammox) uses nitrite nitrogen (NO2-N) as an electron acceptor under anaerobic condition to oxidize ammonia Nitrogen (NH)4-N) autotrophic reduction to N2The Anammox bacteria have slow growth rate and multiplication time of 11 days, and have the advantages of low energy consumption and less sludge production. NO required by Anammox2-N can be provided by a short-cut nitration process, higher concentration (100mg/L) of NO2N inhibits the activity of Anramox to a degree related to the species of Anramox and the inhibition is reversible. The abundance and activity of Anammox bacteria in the actual Anammox process can be affected by a number of factors, including DO, temperature, and substrate concentration, among others. The effect of DO on Anammox bacteria is related to sludge morphology, and the biofilm Anammox system is more tolerant to DO concentrations than activated sludge. The Anammox bacteria have the optimum survival temperature of 30-40 ℃, and research shows that NO appears in the system when the temperature is reduced to 15 DEG C2Accumulation of-N, significant reduction of anammox activity. As the Anamox processes are all mixed bacteria systems, the NH content is low4-N, Low NO2In the case of-N, NOB has a higher affinity for nitrite, possibly dominating substrate competition with Anammox, resulting in reduced Anammox activity. Thus, the Anammox systemHow to avoid NO2Accumulation of-N and achievement of NH4-N and NO2Efficient synchronous removal of-N, to be further investigated.
Disclosure of Invention
The utility model provides a combined device for denitrification, nitrosation and anaerobic ammonia oxidation, which solves the existing problems.
In order to solve the above problem, the utility model discloses a technical scheme as follows:
a combined denitrification-nitrosation-anammox apparatus comprising: the sewage to be treated in the raw water tank and the sewage reflowing from the anaerobic ammonia oxidation reactor enter the bottom of the denitrification reactor, the organic matters in the water are used for denitrifying the sewage through denitrification, and the denitrified effluent flows to the nitrosation reactor or flows to the nitrosation reactor and the anaerobic ammonia oxidation reactor; the nitrosation reactor is used for receiving the denitrified effluent, removing organic matters in the denitrified effluent through aeration and oxygen supply, nitrosating ammonia nitrogen in the denitrified effluent, and enabling the nitrosated effluent to flow to the anaerobic ammonia oxidation reactor; and the anaerobic ammonia oxidation reactor receives the effluent of the nitrosation reactor, or receives the effluent of the denitrification reactor and the effluent of the nitrosation reactor, ammonia nitrogen and nitrite in sewage are removed through an anaerobic ammonia oxidation process, part of the effluent of the anaerobic ammonia oxidation reactor flows back to the denitrification reactor, and the rest part of the effluent is directly discharged.
Preferably, the denitrification reactor is in a continuous flow mode or a sequencing batch mode; the nitrosation reactor adopts a plug flow mode or a sequencing batch mode; the anaerobic ammonia oxidation reactor adopts an activated sludge mode or a biological membrane operation mode.
Preferably, when the denitrification reactor adopts a sequencing batch mode, an aeration head connected with an aeration pump is arranged at the bottom of the denitrification reactor.
Preferably, when the denitrification reactor adopts a continuous flow mode, an effluent sedimentation tank is arranged behind the nitrosation reactor and used for separating mud and water, and sedimentated sludge is refluxed to the nitrosation reactor.
Preferably, when the denitrification reactor adopts a continuous flow mode, stirring devices are arranged in the denitrification reactor and the anaerobic ammonia oxidation reactor.
Preferably, when the denitrification reactor adopts a continuous flow mode, heating devices are arranged in the denitrification reactor and the anaerobic ammonia oxidation reactor.
Preferably, when the concentration ratio of ammonia nitrogen to nitrite in the effluent of the nitrosation reactor is 1:1, the effluent of the denitrification reactor completely enters the nitrosation reactor; when the effluent of the nitrosation reactor is mainly nitrite, the effluent of the denitrification reactor is mixed according to the ratio of 1:1 into the nitrosation reactor and the anammox reactor respectively.
Preferably, the volume ratio of the water in the effluent of the anaerobic ammonia oxidation reactor which flows back to the reflux pool to the sewage in the raw water pool which flows into the denitrification reactor is adjusted according to the concentration of organic matters in the sewage treated by the denitrification reactor and the concentration of nitrate nitrogen in the reflux liquid.
Preferably, the sludge age in the nitrosation reactor acclimation process adopts a step control mode.
Preferably, the reaction time in the nitrosation reactor is controlled according to the ammonia nitrogen concentration, and the aeration is stopped when the expected ammonia nitrogen concentration is reached.
The utility model has the advantages that: the combined device of denitrification-nitrosation-anaerobic ammonia oxidation is provided, sewage is treated by the combined device of a denitrification reactor, a nitrosation reactor and an anaerobic ammonia oxidation reactor, organic matters and nitrates are removed in the denitrification reactor, and enhanced denitrification is realized; in the nitrosation reactor, the ammonia nitrogen is converted into nitrite nitrogen, the conversion rate is high and the operation is stable; in an anaerobic ammonia oxidation reactor, converting ammonia nitrogen and nitrite nitrogen into nitrogen through anaerobic ammonia oxidation and discharging the nitrogen; the effluent part of the anaerobic ammonia reactor flows back to the front end of the denitrification reactor to deeply remove organic matters and nitrogen, so that the stable and efficient operation of the process is realized while the denitrification effect is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a denitrification-nitrosation-anammox combined device of a continuous flow process in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a combined denitrification-nitrosation-anammox apparatus of a sequencing batch process according to an embodiment of the present invention.
FIG. 3 shows the effluent nitrate Nitrogen (NO) of the denitrification reactor in the embodiment of the present invention3-N) schematic representation of the concentration
FIG. 4 shows the ammonia Nitrogen (NH) in the effluent of the nitrosation reactor in the embodiment of the present invention4-N) and nitrous Nitrogen (NO)2-N) schematic representation of the concentration
FIG. 5 shows the ammonia Nitrogen (NH) in the effluent of the anammox reactor in an embodiment of the present invention4-N) and nitrous Nitrogen (NO)2-N) schematic representation of the concentration.
The system comprises a denitrification reactor 1, a nitrosation reactor 2, an anaerobic ammoxidation reactor 3, a raw water tank 4, a reflux tank 5, a denitrification water outlet tank 6, an effluent sedimentation tank 7, an anaerobic ammoxidation water outlet tank 8, a water inlet pump 9, a water inlet pump 10, a water inlet pump 11, an aeration pump 12, a sludge reflux pump 13, a reflux pump 14, a stirring device 15, a heating device 16, an aeration pump 18, an aeration head 19, a water outlet pump 20, a water outlet pump 21, a nitrosation water outlet tank 22, a water inlet pump 23 and a water outlet pump 24.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the embodiment of the present invention will solve more clearly understand, the following combines the drawings and embodiment, and goes forward the further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixing function or a circuit connection function.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Example 1
In the prior art, anaerobic ammonia oxidation has the characteristics of low energy consumption and low treatment cost, but the application of anaerobic ammonia oxidation is limited due to complex components and low nitrite nitrogen content in actual sewage.
The national first-level A discharge standard stipulates that the concentration of total nitrogen in discharged sewage is less than or equal to 15mg/L, and nitrate nitrogen is generated due to anaerobic ammonia oxidation reaction, so that the total nitrogen removal rate is reduced, and the denitrification effect is influenced.
As shown in fig. 1 and 2, the present invention provides a combined denitrification-nitrosation-anammox apparatus, comprising:
the sewage to be treated in the raw water tank and the sewage reflowing from the anaerobic ammonia oxidation reactor enter the bottom of the denitrification reactor, the organic matters in the water are used for denitrifying the sewage through denitrification, and the denitrified effluent flows to the nitrosation reactor or flows to the nitrosation reactor and the anaerobic ammonia oxidation reactor;
a nitrosation reactor, which receives the denitrified effluent, removes organic matters in the denitrified effluent through aeration and oxygen supply, nitrosates ammonia nitrogen in the denitrified effluent, and the nitrosated effluent flows to an anaerobic ammonia oxidation reactor;
and the anaerobic ammonia oxidation reactor receives the effluent of the nitrosation reactor, or receives the effluent of the denitrification reactor and the effluent of the nitrosation reactor, further removes ammonia nitrogen and nitrite in sewage, and the effluent of the anaerobic ammonia oxidation reactor reflows to the denitrification reactor and is directly discharged. In an embodiment of the present invention, the volume ratio of the water flowing back to the reflux pool in the effluent of the anammox reactor and the sewage flowing into the denitrification reactor in the raw water pool is adjusted according to the concentration of the organic matter in the influent and the concentration of the nitrate nitrogen in the reflux.
In one embodiment of the present invention, the operation mode of the denitrification reactor can adopt continuous flow or sequencing batch, the sewage in the raw water pool to be treated and the sewage flowing back from the anaerobic ammonia oxidation synchronously enter the bottom of the reactor, and under the operation condition of activated sludge or biomembrane, the organic matters in the inlet water are effectively utilized to denitrify through denitrification; after the reaction, the sludge-water separation is realized from the upper part of the reactor, and the treated effluent flows out by gravity. Sludge is discharged from the bottom of the reactor regularly, the sludge age is controlled, and certain sludge activity is maintained. If a sequencing batch operation mode is adopted, aeration is set for a short time after denitrification before sludge settlement so as to blow off nitrogen and reduce the concentration of unused organic matters.
A nitrosation reactor mainly adopts a plug flow type or sequencing batch type reactor, realizes the gradient distribution of pollutant concentration along time or space, and improves the reaction rate of microorganisms. The denitrification effluent enters a nitrosation reactor, and oxygen is supplied through aeration to realize the removal of residual organic matters and the nitrosation of ammonia nitrogen in the denitrification effluent. When a plug-flow reactor is adopted, the tail end adopts a sedimentation tank to realize mud-water separation, and sludge flows back to the water inlet end of the reactor; when a sequencing batch reactor is adopted, sludge enrichment is realized through precipitation in a time process. In the domestication process, the sludge age adopts a step-by-step control mode, and in the domestication stage, the sludge age is firstly adopted for 10 days, and the operation is carried out for 3 periods, so that other non-functional bacteria are effectively flushed out; after the sludge is operated for 3 years, the process does not discharge sludge or discharges a small amount of sludge, and the concentration of nitrifying bacteria sludge is ensured, so that the process treatment load is effectively improved. The reaction time is controlled according to the ammonia nitrogen concentration, and when the ammonia nitrogen concentration in the reactor reaches an expected value (for example, less than 3mg/L), the aeration is stopped, and the activity of nitrite nitrifying bacteria is inhibited.
The anaerobic ammonia oxidation reactor adopts an active sludge or biological membrane operation mode. When the concentration ratio of ammonia nitrogen to nitrite in the effluent of the nitrosation reactor is 1:1, taking the nitrosation effluent as anaerobic ammonia oxidation inlet water; when the effluent of the nitrosation reactor is mainly nitrite, the effluent of the denitrification reactor is mixed according to the ratio of 1:1 into the nitrosation reactor and the anammox reactor respectively. The inlet water passes through a sludge layer or a biological membrane in the reactor, so that the ammonia nitrogen and the nitrite are synchronously removed. According to the operation mode, the high-load operation mode of the reactor can be maintained without discharging mud or with little discharging mud. Specifically, when the concentration of ammonia nitrogen and nitrite in the effluent of the nitrosation reactor is 1:1, the effluent of the nitrosation is used as the anaerobic ammonia oxidation inlet water; when the nitrosation effluent is mainly nitrite, the denitrification effluent and the nitrosation effluent are mixed according to the water quantity of 1:1 and then enter the anaerobic ammonia oxidation reactor.
For the continuous flow process, the denitrification-nitrosation-anaerobic ammonia oxidation combined device comprises a denitrification reactor 1, a nitrosation reactor 2 and an anaerobic ammonia oxidation reactor 3, wherein the denitrification reactor 1 comprises a reactor body, a stirring device 15 and a heating device 16, the reactor is integrally cylindrical, and the lower end of the reactor is connected with a conical sludge hopper, so that sludge is conveniently discharged; the motor part of the stirring device 15 is fixed on the top cover at the upper end of the denitrification reactor 1, and the stirring paddle extends into the denitrification reactor 1; the heating device 16 is fixed to the wall of the denitrification reactor 1 by a suction cup. The operation mode of the denitrification reactor 1 adopts continuous flow, sewage to be treated in the raw water tank 4 and sewage flowing back from anaerobic ammonia oxidation in the return tank 5 synchronously enter the bottom of the denitrification reactor 1 through the water inlet pump 9, organic matters in inlet water are effectively utilized, and nitrate in the water is removed through denitrification. The treated effluent flows out to a denitrification effluent pool 6 by gravity.
The destination of the sewage in the denitrification water outlet pool 6 is determined by the water quality of the effluent of the nitrosation reactor 2. When the concentration of the ammonia nitrogen and the nitrite in the effluent is 1:1, the sewage in the denitrification effluent pool 6 enters the nitrosation reactor 2 through the water inlet pump 10; when the nitrosation effluent is mainly nitrite, 50% of sewage in the denitrification effluent pool 6 is input into the nitrosation reactor through the water inlet pump 10, and 50% of sewage enters the anaerobic ammonia oxidation reactor through the water inlet pump 11.
Set up 4 guide plates equally in nitrosation reactor 2, the ammonia nitrogen is oxidized into nitrite nitrogen, further removes the organic matter in the sewage simultaneously. The nitrosation reactor 2 is provided with an aeration pump 12, so that the dissolved oxygen concentration in the nitrosation reactor 2 is improved, and the removal of residual organic matters and the nitrification of ammonia nitrogen in the denitrification effluent are realized.
The waste water treated in the nitrosation reactor 2 is subjected to mud-water separation in an effluent sedimentation tank 7, the waste water enters the anaerobic ammonia oxidation reactor through a water inlet pump 11, and the sludge is pumped back to the nitrosation reactor 2 through a sludge return pump 13.
The anammox reactor 3 has the same structure as the denitrification reactor 1, and performs anammox treatment on the inputted sewage, and the treated sewage enters an anammox effluent tank 8. Part of wastewater in the anaerobic ammonia oxidation effluent tank 3 is discharged, and part of wastewater enters the reflux tank through a reflux pump 14.
The combined device of denitrification-nitrosation-anaerobic ammonia oxidation is characterized in that:
1. the denitrification reactor and the anaerobic ammonia oxidation reactor are internally provided with stirring devices, so that sewage and sludge in the reactors can be fully mixed, and the mass transfer effect is improved.
2. Heating devices are arranged in the denitrification reactor and the anaerobic ammonia oxidation reactor, so that the temperature of sewage water can be maintained at about 30 ℃, and a proper growth environment is provided for microorganisms in sludge.
3. The nitrosation reactor is provided with an aeration pump, so that the dissolved oxygen concentration in the reactor is improved, and the removal of residual organic matters in the denitrification effluent and the nitrosation of ammonia nitrogen are realized.
4. The nitrosation reactor adopts plug flow type, sewage flows to the tail end of the reactor in plug flow type, the nutrition and growth characteristics of sludge microorganisms in the tank change along the length of the tank, and the treatment efficiency is high.
5. The water inlet of the anaerobic ammonia oxidation reactor can be flexibly adjusted according to the water quality of the effluent of the nitrosation reactor.
6. An effluent sedimentation tank is arranged behind the nitrosation reactor, sludge-water separation can be realized in the effluent sedimentation tank, and the precipitated sludge is pumped back to the nitrosation reactor, so that the sludge loss is avoided.
In the sequencing batch process, the sequencing batch denitrification-nitrosation-anaerobic ammonia oxidation combined device comprises a denitrification reactor 1, a nitrosation reactor 2 and an anaerobic ammonia oxidation reactor 3, wherein:
the denitrification reactor 1 is provided with an aeration head 18 connected with an aeration pump 17 at the bottom, and the other structures are the same as the continuous flow denitrification reactor 1. In the water inlet stage, the water inlet pump 9 is started, and the sewage in the raw water tank 4 and the return tank 5 enters the denitrification reactor 1 through the water inlet pump 9; in the stirring stage, the water inlet pump 9 is closed, water inlet is stopped, the stirring device 15 is started, sludge and sewage are fully mixed, and nitrate and organic matters are removed; at the end of the stirring stage, the aeration pump 17 is started, the denitrification reactor 1 is aerated and oxygenated, and the organic matters are further removed; and in the standing and precipitating stage, the stirring device 15 and the aeration pump 17 are closed, and the sludge and the water in the denitrification reactor 1 are separated. In the water outlet stage, the water outlet pump 19 is started, and the sewage flows into the denitrification water outlet tank 6 through the water outlet pump 19. The heating means 16 is switched on at each stage to provide a suitable growth environment for the microorganisms.
The sewage in the denitrification effluent pool 6 goes to the same direction as the continuous flow device.
In the water inlet stage of the nitrosation reactor 2, the water inlet pump 20 is started, and the sewage in the denitrification water outlet tank 6 enters the nitrosation reactor 2 through the water inlet pump 20; in the stirring stage, the water inlet pump 20 is closed, water inlet is stopped, and the stirring device 15 and the aeration pump 17 are opened to remove residual organic matters and nitrify ammonia nitrogen in the denitrification effluent; and in the standing and precipitating stage, the stirring device 15 and the aeration pump 17 are closed, and the mud and water in the nitrosation reactor are separated. In the water outlet stage, the water outlet pump 21 is started, and the sewage flows into the nitrosation water outlet tank 22 through the water outlet pump 21. The heating means 16 is switched on at each stage to provide a suitable growth environment for the microorganisms.
The anammox reactor 3 has the same structure as the continuous flow anammox reactor. In the water inlet stage, a water inlet pump 23 is started, and sewage in the nitrosation water outlet tank enters the anaerobic ammonia oxidation reactor 3 through the water inlet pump 23; in the stirring stage, the water inlet pump 23 is closed, water inlet is stopped, and the stirring device 15 is opened to synchronously remove ammonia nitrogen and nitrite nitrogen; and in the standing and precipitating stage, the stirring device 15 is closed, and the sludge and the water in the anaerobic ammonia oxidation reactor 3 are separated. In the effluent stage, the effluent pump 24 is started, and the sewage flows into the anaerobic ammonia oxidation effluent pool 8 through the effluent pump 24. The heating means 16 is switched on at each stage to provide a suitable growth environment for the microorganisms.
Part of wastewater in the anaerobic ammonia oxidation effluent tank 8 is discharged, and part of wastewater enters the reflux tank through a reflux pump 14.
The main differences between the sequencing batch process and the continuous flow process are:
1. the operation of the denitrification reactor, the nitrosation reactor and the anaerobic ammoxidation reactor comprises three stages of water inlet, stirring, standing and precipitation and water outlet.
2. The denitrification reactor is provided with short-time aeration at the end of the stirring stage to blow off nitrogen and reduce the concentration of unused organic matters.
3. The nitrosation reactor realizes sludge enrichment in a standing and settling stage, so that an effluent settling tank and a sludge reflux pump are not required to be arranged.
Example 2
The embodiment provides a sequencing batch denitrification-nitrosation-anaerobic ammonia oxidation combined device.
As shown in fig. 3 to 5, wherein the denitrification reactor comprises: peristaltic pump, reactor body, business turn over pond, aeration systems, agitating unit and heating device. In the stirring stage, a stirrer is used for stirring to ensure that the activated sludge is in an anoxic suspension state; and an aeration pump and an aeration head are adopted for aeration at the end of the stirring stage. The start and stop of the peristaltic pump, the stirrer and the aeration pump are controlled by a timer. Each reactor is thermostatically controlled by a stainless steel heating device, and the reactor is ensured to operate at 25 ℃ for a long time. The nitrogen concentration of nitrate in the effluent of the reactor is lower than 15mg/L, and the removal effect is good.
The nitrosation reactor comprises: peristaltic pump, reactor body, business turn over pond, aeration systems, agitating unit and heating device. And in the reaction stage, a stirrer is adopted for stirring, an oxygenation pump and a microporous aerator are adopted for aeration simultaneously, the aeration rate is controlled by a flowmeter, and the opening and closing of the peristaltic pump, the stirrer and the oxygenation pump are controlled by a timing controller. The reactors are all temperature controlled by a stainless steel water heating device. Because the nitrosation rate of the nitrosation reactor is more than 90 percent, and the effluent of the reactor mainly contains nitrite nitrogen, the volume ratio of the effluent flowing into the anaerobic ammonia oxidation reactor and the nitrosation reactor in the denitrification effluent pool is 1: 1.
the anaerobic ammonia oxidation reactor comprises: peristaltic pump, reactor body, business turn over pond, aeration systems, agitating unit and heating device. The data of long-term operation show that the reactor has stable treatment effect, the concentrations of the ammonia nitrogen and the nitrite nitrogen in the effluent are both maintained at about 30mg/L, and the removal rates of the ammonia nitrogen and the nitrite nitrogen are respectively 90.0 percent and 92.1 percent.
Therefore, the denitrification-nitrosation-anaerobic ammonia oxidation process of the utility model utilizes the combined device of the denitrification reactor, the nitrosation reactor and the anaerobic ammonia oxidation reactor to treat sewage, removes organic matters and nitrates in the denitrification reactor, and realizes enhanced denitrification; in the nitrosation reactor, the ammonia nitrogen is converted into nitrite nitrogen, the conversion rate is high and the operation is stable; in an anaerobic ammonia oxidation reactor, converting ammonia nitrogen and nitrite nitrogen into nitrogen through anaerobic ammonia oxidation and discharging the nitrogen; the effluent part of the anaerobic ammonia reactor flows back to the front end of the denitrification reactor to deeply remove organic matters and nitrogen, so that the stable and efficient operation of the process is realized while the denitrification effect is ensured.
The utility model discloses mainly to the limitation of traditional nitrification and denitrification high ammonia nitrogen wastewater treatment process in practical application, provide denitrification-nitrosation-anaerobism ammonia oxidation branch mud combined process, under the prerequisite of optimizing different functional bacteria, realize technology operation treatment load maximize. The method is a novel original method, and the main innovation points comprise: (1) the denitrification is adopted to intensively remove the nitrate in the anaerobic ammonia oxidation effluent, so that the total nitrogen removal efficiency is improved. (2) The inhibition of nitrite nitrifying bacteria is realized by adopting coupling of free ammonia and free nitrous acid, reaction time control and the like, and meanwhile, the operation mode of maintaining high-concentration ammonia nitrifying bacteria by discharging sludge firstly and then not discharging sludge is adopted, so that the treatment load is improved. And (3) adopting anaerobic ammonia oxidation to efficiently remove ammonia nitrogen and nitrite, and realizing the purpose of high-load denitrification of the high-ammonia nitrogen wastewater.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model belongs to the prerequisite of not deviating from the utility model discloses, can also make a plurality of equal substitution or obvious variants, performance or usage are the same moreover, all should regard as belonging to the utility model's scope of protection.
Claims (10)
1. A combined denitrification-nitrosation-anammox apparatus comprising:
the sewage to be treated in the raw water tank and the sewage reflowing from the anaerobic ammonia oxidation reactor enter the bottom of the denitrification reactor, the organic matters in the water are used for denitrifying the sewage through denitrification, and the denitrified effluent flows to the nitrosation reactor or flows to the nitrosation reactor and the anaerobic ammonia oxidation reactor;
the nitrosation reactor is used for receiving the denitrified effluent, removing organic matters in the denitrified effluent through aeration and oxygen supply, nitrosating ammonia nitrogen in the denitrified effluent, and enabling the nitrosated effluent to flow to the anaerobic ammonia oxidation reactor;
and the anaerobic ammonia oxidation reactor receives the effluent of the nitrosation reactor, or receives the effluent of the denitrification reactor and the effluent of the nitrosation reactor, ammonia nitrogen and nitrite in sewage are removed through an anaerobic ammonia oxidation process, part of the effluent of the anaerobic ammonia oxidation reactor flows back to the denitrification reactor, and the rest part of the effluent is directly discharged.
2. The combined denitrification-nitrosation-anammox apparatus of claim 1,
the denitrification reactor adopts a continuous flow mode or a sequencing batch mode;
the nitrosation reactor adopts a plug flow mode or a sequencing batch mode;
the anaerobic ammonia oxidation reactor adopts an activated sludge mode or a biological membrane operation mode.
3. The combined denitrification-nitrosation-anammox apparatus of claim 2, wherein when the denitrification reactor is in a sequencing batch mode, the bottom of the denitrification reactor is provided with an aeration head connected to an aeration pump.
4. The combined denitrification-nitrosation-anammox apparatus of claim 2, wherein when the denitrification reactor is in continuous flow mode, an effluent sedimentation tank is provided behind the nitrosation reactor for sludge-water separation, and the settled sludge is returned to the nitrosation reactor.
5. A combined denitrification-nitrosation-anammox apparatus as claimed in claim 2, wherein when the denitrification reactor is in continuous flow mode, stirring means are provided in both the denitrification reactor and the anammox reactor.
6. A combined denitrification-nitrosation-anammox apparatus as claimed in claim 2, wherein when the denitrification reactor is in continuous flow mode, heating means are provided in both the denitrification reactor and the anammox reactor.
7. The combined denitrification-nitrosation-anammox apparatus of claim 1,
when the concentration ratio of ammonia nitrogen to nitrite in the effluent of the nitrosation reactor is 1:1, the effluent of the denitrification reactor completely enters the nitrosation reactor;
when the effluent of the nitrosation reactor is mainly nitrite, the effluent of the denitrification reactor is mixed according to the ratio of 1:1 into the nitrosation reactor and the anammox reactor respectively.
8. The combined denitrification-nitrosation-anammox apparatus of claim 1, wherein the ratio of the volume of water in the effluent from the anammox reactor that flows back to the reflux tank to the volume of the wastewater in the raw water tank that flows into the denitrification reactor is adjusted according to the concentration of organic matter in the wastewater treated by the denitrification reactor and the concentration of nitrate nitrogen in the reflux.
9. The combined denitrification-nitrosation-anammox apparatus of claim 1, wherein a step control mode is used for sludge age during the acclimation process of the nitrosation reactor.
10. The combined denitrification-nitrosation-anammox apparatus of claim 1, wherein the reaction time in said nitrosation reactor is controlled according to the ammonia nitrogen concentration, and the aeration is stopped when the desired ammonia nitrogen concentration is reached.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436631A (en) * | 2019-09-09 | 2019-11-12 | 清华大学深圳研究生院 | Denitrification-nitrosation-anaerobic ammoxidation combination unit and wastewater treatment method |
| CN112079440A (en) * | 2020-09-14 | 2020-12-15 | 山东省环保产业股份有限公司 | Device and process for biological treatment of wastewater through zoning, independence and high-efficiency combination |
| CN114180719A (en) * | 2021-12-21 | 2022-03-15 | 四川省宜宾五粮液集团有限公司 | Fermentation wastewater treatment system and method for treating fermentation wastewater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436631A (en) * | 2019-09-09 | 2019-11-12 | 清华大学深圳研究生院 | Denitrification-nitrosation-anaerobic ammoxidation combination unit and wastewater treatment method |
| CN112079440A (en) * | 2020-09-14 | 2020-12-15 | 山东省环保产业股份有限公司 | Device and process for biological treatment of wastewater through zoning, independence and high-efficiency combination |
| CN114180719A (en) * | 2021-12-21 | 2022-03-15 | 四川省宜宾五粮液集团有限公司 | Fermentation wastewater treatment system and method for treating fermentation wastewater |
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