CN1295163C - Anaerobic ammonia oxidation reactor - Google Patents

Abstract

The present invention discloses an anaerobic ammonia oxidation reactor provided with a reactor body, wherein the lower end of the reactor body is provided with a water inlet pipe, and the upper end of the reactor body is provided with a sealing cover, a sludge settling zone and an overflow weir. The sealing cover is provided with an air outlet, the lower end of the sludge settling zone is provided with a return sludge flow slit of the settling zone, and a stirrer is arranged in the reactor. The anaerobic ammonia oxidation reactor has the advantages that 1, microbes carrying out the anaerobic ammonia oxidation reaction exist in the form of particle sludge, the potentiality of the anaerobic ammonia oxidation reaction is large, and the sludge and water separation effect is good; 2, a settling chamber is arranged on an outer ring at the upper part of the reactor body, and therefore, the structure is compact; 3, the stirrer runs at a certain speed, which makes polluted water in the reactor sufficiently in contact with the particle sludge, and thereby, the mass transfer process is strengthened; 4, no dead zone exists in the reactor, so that the fluidization performance of the sludge is good, and the running performance is stable; 5, the reactor has very good anaerobic ammonia oxidation performance, the reactor can bear high concentration of water inflow ammonia and nitrite, and the reactor has high volume conversion efficiency.

Description

A kind of anaerobic ammonia oxidation reactor

technical field

The invention relates to an anaerobic ammonia oxidation reactor.

Background technique

With the development of industrial and agricultural production and the improvement of people's living standards, the discharge of nitrogenous organic matter has increased dramatically. Secondary biological treatment has been launched one after another. Although it has played a good role in curbing organic pollution, the high nitrogen content in the effluent is still a serious source of environmental pollution. Nitrogen pollution is extremely harmful. Ammonia entering the water body can not only induce "eutrophication" and cause the disorder of the aquatic ecosystem, but also consume dissolved oxygen, resulting in hypoxia in the water body, affecting the oxygen transfer of strontium in fish, making fish Lethal; react with chlorine gas to form chloramine, which affects chlorination disinfection treatment. Therefore, it is imperative to control nitrogen pollution economically and effectively.

There are many methods for denitrification of wastewater, including physical, chemical and biological methods. Due to various reasons, the application of physical and chemical methods is greatly restricted. At present, biological denitrification technology is mainly used at home and abroad. Anammox reaction can convert ammonia and nitrite into nitrogen gas, eliminating the impact of ammonia on the environment. Therefore, the research and development of anammox reactor has important practical significance.

The existing anammox reactors are mainly evolved from anaerobic tanks. In order to ensure that there is a certain amount of microorganisms (activated sludge) in the device for anaerobic ammonia oxidation, a secondary sedimentation tank is generally built after the anaerobic tank to separate the activated sludge. On the one hand, it can meet the activity required by the anaerobic tank. Sludge, on the other hand, meets the requirements of effluent water quality. Separating the activated sludge with the secondary settling tank and sending it back to the anaerobic tank through the reflux pump not only increases the equipment and consumes power, but also destroys the structure of the activated sludge, which is not conducive to the formation of granular sludge with excellent sedimentation performance and the separation of mud and water.

Contents of the invention

The purpose of the present invention is to provide a kind of anaerobic ammonium oxidation reactor.

The anaerobic ammonium oxidation reactor has a cylindrical reactor body, with a water inlet pipe at the lower end of the reactor body, a sludge settling area, an overflow weir, and a sealing cover at the upper end of the reactor body, and a sludge settling area at the lower end of the sludge settling area. There is a stirrer inside the reactor, and a stirring shaft sleeve and an air outlet on the sealing cover. The anammox bacteria in the reactor exist in the form of granular sludge.

Advantages of the present invention: 1) The microorganisms performing the anammox reaction exist in the form of granular sludge, the anaerobic ammonium oxidation reaction potential is large, and the mud-water separation effect is good; 2) the settling chamber is arranged on the upper outer ring of the reactor body, and the It is compact, eliminating the need for secondary sedimentation tanks and sludge return facilities, and avoiding the damage of the return pump to the granular sludge; 3) The agitator runs at a certain speed, so that the sewage in the reactor is fully in contact with the granular sludge, and strengthens the transmission process. 4) There is no dead zone in the reactor, the fluidization performance of the sludge is good, and the operation performance is stable; 5) The reactor has good anaerobic ammonium oxidation performance, can withstand high influent ammonia concentration, and has high volumetric conversion efficiency .

Description of drawings

Fig. 1 is a structural representation of anaerobic ammonium oxidation reactor;

Fig. 2 is a structural top view of anaerobic ammonium oxidation reactor;

In the figure: cylindrical reactor body 1, water inlet pipe 2, sludge settling area 3, overflow weir 4, sealing cover 5, sludge return joint 6, agitator 7, stirring shaft sleeve 8, air outlet 9.

Detailed ways

As shown in the figure, the anammox reactor has a cylindrical reactor body 1, a water inlet pipe 2 is provided at the lower end of the reactor body, and a sludge sedimentation area 3, an overflow weir 4, and a sealing cover 5 are arranged at the upper end of the reactor body , a sludge reflow joint 6 is provided at the lower end of the sludge sedimentation area, an agitator 7 is provided inside the reactor, a stirring shaft sleeve 8 and an air outlet 9 are provided on the sealing cover, and the anammox bacteria in the reactor take the form of particles The form of sludge exists.

The height-to-diameter ratio H/D of the cylindrical reactor body 1 is 1.5-2.5, and the horizontal inclination angle α of the lower slope is 50°-55°. The height of the sludge settling area 3 accounts for 1/5-1/6 of the height of the reactor body, and the volume of the sludge settling area accounts for 1/6-1/7 of the total volume. The angle β between them is 50°～55°. The water inlet pipe 2 is arranged at 15-20 mm above the bottom of the reactor. The stirrer is set at the center of the reactor body 50-150mm away from the bottom of the reactor, and the stirring shaft is connected by a sleeve immersed in the reaction solution. The sealing cover is movable and cylindrical, and is buckled upside down on the outside of the reactor body, and the lower end of the sealing cover cylinder is immersed in the 30-50mm of the reaction solution. Anaerobic ammonia oxidation granular sludge is a kind of biological pellet formed by the aggregation of anammox bacteria.

The sealing cover of the present invention is a movable type, cylindrical in shape, upside down on the outside of the reactor body, and can be separated from the reactor body when necessary; the lower end of the sealing cover cylinder body is immersed in the reaction solution, which can prevent external air from entering the reaction zone; There is a gas outlet on the cover to discharge the gas generated in the reactor. There is a sludge return slot at the lower end of the sludge settling area, allowing the sludge in the settling area to return to the reaction area. There is a stirrer inside the reactor, which can strengthen the contact between the substrate and the organism, and the stirring shaft is connected with the stirrer through a sleeve immersed in the reaction solution, which can prevent external air from entering the reaction zone. The anammox bacteria in the reactor exist in the form of granular sludge, which has excellent sedimentation performance and is easy to separate mud and water.

The anaerobic ammonium oxidation reactor can be constructed with steel or reinforced concrete, and the reaction chamber and the sludge sedimentation chamber are built together in the same circular pool. Inoculation sludge was added to the reaction zone. Sewage is introduced into the bottom of the reaction zone through the water inlet pipe. The reaction zone is stirred by a stirrer to fully contact the solid and liquid, effectively improving the mass transfer efficiency. The sludge settling zone surrounds the reactor body. The rising speed of the liquid flow in the sedimentation area is relatively slow, and the sludge brought to the sedimentation area is effectively separated and returned to the reaction area by the gravity of the sludge. The effluent is discharged from the overflow weir in the sedimentation area.

The invention improves the settling performance of the activated sludge by granulating the sludge, recovers the granular sludge by building a settling tank on the upper part of the device, increases the sludge concentration, and improves the mass transfer efficiency by stirring. The test proves that the new anammox reactor developed accordingly has good anammox performance. Under the conditions of pH 7.5-8.5 and reaction temperature 25-35°C, it can withstand high concentrations of ammonia and nitrite in the feed water, has high volumetric conversion efficiency, and has stable operating performance.

Claims (7)

1, a kind of anaerobic ammonium oxidation reactor, it is characterized in that: it has cylindrical reactor body (1), is provided with water inlet pipe (2) at reactor body lower end, and reactor body upper end is provided with sludge sedimentation area ( 3), overflow weir (4), sealing cover (5), a sludge return joint (6) is provided at the lower end of the sludge settling area, an agitator (7) is provided inside the reactor, and a stirring tank is provided on the sealing cover The shaft sleeve (8) and the gas outlet (9), the anammox bacteria in the reactor exist in the form of granular sludge. 2. An anammox reactor according to claim 1, characterized in that: the height-to-diameter ratio H/D of the cylindrical reactor body (1) is 1.5-2.5, and the horizontal inclination angle α of the lower slope It is 50°～55°. 3. An anammox reactor according to claim 1, characterized in that: the height of the sludge settling area (3) accounts for 1/5 to 1/6 of the height of the reactor body, and the sludge The volume of the sedimentation zone accounts for 1/6-1/7 of the total volume, and the angle β between the bottom plate of the sludge return slot (6) and the horizontal plane is 50°-55°. 4. An anammox reactor according to claim 1, characterized in that: the water inlet pipe (2) is set at 15-20 mm above the bottom of the reactor. 5. An anammox reactor according to claim 1, characterized in that: the agitator is set at the center of the reactor body 50-150mm away from the bottom of the reactor, and the agitator shaft is immersed in the reaction solution socket connection. 6. An anaerobic ammonium oxidation reactor according to claim 1, characterized in that: the sealing cover is designed as a movable type, cylindrical, upside down on the outside of the reactor body, and the lower end of the sealing cover cylinder is submerged At 30-50mm of the reaction solution. 7. An anammox reactor according to claim 1, characterized in that the anammox granular sludge is a biological particle formed by the aggregation of anammox bacteria.

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