A highly efficient full-process denitrification reactor unit

Abstract

The present invention belongs to the technical field of environmentally friendly sewage and waste gas treatment equipment, specifically a high-efficiency full-process denitrification reactor. A separate reaction room can most stably maintain and enhance the short-range denitrification reaction process, a recovery mechanism can recover dissolved oxygen, and a control and sensing mechanism can enhance precise control. It includes a full-type biological reaction tower and a strong reaction type reactor, and the strong reaction type reactor includes a main reaction tank, a bell-type mixing chamber, an oil filter absorber, and a reaction oxygen supplier; a reaction filter frame surrounded by a biological reaction microfiltration membrane is arranged in the center of the main reaction tank, and the reaction filter frame divides the entire main reaction tube into an inner high-oxygen reaction chamber inside the reaction filter frame and an equivalent reaction chamber outside the reaction filter frame. An oil filter absorber is arranged at the bottom of the main reaction tank, and a repeated jet suction filter head of the oil filter absorber is inserted at the bottom of the main reaction tank; the bell-type mixing chamber is arranged in the inner high-oxygen reaction chamber.

Description

Technical Field

[0001] The invention belongs to the technical field of environmentally friendly sewage and waste gas treatment equipment, and specifically relates to a high-efficiency full-process denitrification reactor group. Background Art

[0002] Biological denitrification refers to the process in which organic nitrogen and ammonia nitrogen in sewage are converted into nitrogen gas through ammoniation, nitrification, and denitrification under the combined action of microorganisms. It has the advantages of being economical, effective, easy to operate, and free of secondary pollution. The wastewater biological denitrification technology in the prior art is generally carried out in a vertical or horizontal bioreactor (tower) or reaction tank. However, due to the problem of reaction control, most of them use sealed or semi-sealed tower reactors. The reaction process is generally (1) nitrification-denitrification biological denitrification technology, also known as traditional biological denitrification technology, (2) short-term nitrification-denitrification biological denitrification technology, and (3) short-term denitrification-anaerobic ammonia oxidation biological denitrification technology. The nitrification reaction process uses molecular oxygen as the final electron acceptor. Therefore, nitrification can only occur when molecular oxygen (dissolved oxygen) is present. In order to achieve normal nitrification effect, it is very important to maintain the supply of molecular oxygen (dissolved oxygen) during the operation of the activated sludge process. Summary of the invention

[0003] The object of the present invention is to provide a highly efficient full-range denitrification reactor group, which is provided with a separate reaction room to enhance the short-range denitrification reaction process, a recovery mechanism to recover dissolved oxygen, and a control and sensing mechanism to enhance precise control.

[0004] A high-efficiency full-process denitrification reactor group includes a spray-type bioreactor and a strong reaction reactor. A first-order reaction water pipe is arranged on the reaction water outlet of the spray-type bioreactor and connected to the first-order water inlet arranged on the top of the strong reaction reactor.

[0005] The strong reaction type reactor comprises a main reaction tank, a bell-type gas mixing chamber, an oil filter absorber, and a reaction oxygen supplier; a reaction filter frame surrounded by a biological reaction microfiltration membrane is arranged in the center of the main reaction tank, and the reaction filter frame divides the entire main reaction tank into an inner high oxygen reaction chamber inside the reaction filter frame and an equivalent reaction chamber outside the reaction filter frame; an oil filter absorber is arranged at the bottom outside the main reaction tank, and the repeated jet suction filter head of the oil filter absorber is inserted into the bottom of the main reaction tank; the bell-type gas mixing chamber is arranged in the inner high oxygen reaction chamber, and comprises a flared portion at the bottom, a gas collecting bucket portion at the top, and a flared portion and a gas collecting bucket portion. A gas mixing reaction chamber between the gas bucket parts, an exhaust pipe is also arranged on the top of the gas collecting bucket part, the exhaust pipe is introduced into the gas recovery chamber connected thereto, a gas-water separation valve is arranged in the gas recovery chamber, the gas distribution pipe of the gas-water separation valve is connected to the gas filter device, the other end of the gas filter device is connected to the reaction oxygen supplier through the gas transmission pipe, an oxygen supply pipe is arranged inside the gas mixing reaction chamber, one end of the oxygen supply pipe is connected to the reaction oxygen supplier, the other end of the oxygen supply pipe extends to the intersection of the flared part and the gas mixing reaction chamber and is suspended with a micronized jet nozzle, and a plurality of outgoing drainage pipes are also arranged on the gas mixing reaction chamber;

[0006] Preferably, a heater is also provided in the equivalent reaction chamber to increase the temperature supply and maintain the biological reaction temperature with maximum activity under low temperature conditions, such as early spring and winter.

[0007] Preferably, a pressure relief valve is provided at the root of the gas collecting bucket, which can be used as an emergency exhaust device to discharge excess reaction oxygen or mixed gas.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the mud-water separation effect is greatly enhanced, and energy saving and consumption reduction are achieved. The amount of sodium acetate used in the half-denitrification process is 1.80 kg / kg NO3¯-N, which saves 60% of the carbon source compared with the full-process denitrification; anaerobic ammonia-oxidizing bacteria directly convert ammonia nitrogen and nitrite nitrogen into nitrogen gas under anoxic conditions, avoiding the nitrification and denitrification process of ammonia nitrogen, saving 100% of the aeration volume in the ammonia nitrogen removal part, and saving 100% of the carbon source; it can achieve simultaneous denitrification and desulfurization, which not only saves the cost of waste gas and wastewater pretreatment, but also can use sulfides to improve the total nitrogen removal effect. In addition, the high volumetric load can greatly reduce the volume of the reactor and reduce the floor space; due to the large volumetric gas production, sufficient self-stirring can be generated, eliminating the need for agitators / flow promoters required by traditional denitrifiers. Since the bacteria exist in the form of granular sludge, the mud-water separation effect can be greatly enhanced, engineering equipment can be reduced, and ultimately energy saving and consumption reduction can be achieved;

[0009] In the traditional denitrification process, generally only one structure is set up, and the fluctuation of the inlet water quality can easily lead to the change of the outlet water quality. In this denitrification process, a main reactor I (referred to as the main tower, i.e. the spray-type bioreactor tower in the present invention) and a sub-reactor II (i.e. the core strong reaction type reactor created by the present invention) are set up. The main tower adopts "fast-growing" denitrification bacteria, which can quickly remove nitrogen pollutants in wastewater and achieve high load. The sub-tower adopts "powerful" denitrification bacteria, which can effectively remove nitrogen pollutants in wastewater and achieve the removal of most pollutants. The main and sub-towers complement each other, and the total nitrogen removal rate and removal rate are far superior to the traditional nitrification and denitrification process. The product fills the gap in the industrial application of anaerobic ammonia oxidation in China, and has the characteristics of short start-up time, high volumetric efficiency, and low operating cost, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the present invention.

[0011] Figure 2 This is the structural diagram of the strong reaction type reactor. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] Example 1 Please refer to Figure 1 A high-efficiency full-process denitrification reactor group includes a spray-type bioreactor 1 and a strong reaction type reactor 2. A first-order reaction water pipe is arranged on the reaction water outlet of the spray-type bioreactor 1 and connected to the first-order water inlet arranged on the top of the strong reaction type reactor 2; the spray-type bioreactor can use the spray-type bioreactor of the prior art, and the organic wastewater after only sedimentation and filtration is treated by a reaction disk and sprayed catalyzed, atomized, etc. After the treatment is completed, it enters a collection pool, and then is input into a temporary resin tank or a secondary sedimentation tank through a central or side discharge port, and then enters the strong reaction type reactor 2 through an input pipeline according to demand;

[0014] The strong reaction type reactor 2 includes a main reaction tank 3, a bell-type gas mixing chamber 4, an oil filter absorber 5, and a reaction oxygen supplier 6; a reaction filter frame 7 surrounded by a biological reaction microfiltration membrane is arranged in the center of the main reaction tank 3, and the reaction filter frame divides the entire main reaction tank 3 into an inner high oxygen reaction chamber 8 inside the reaction filter frame and an equivalent reaction chamber outside the reaction filter frame, an oil filter absorber is arranged at the bottom outside the main reaction tank, and the repeated jet suction filter head of the oil filter absorber is inserted into the bottom of the main reaction tank; the bell-type gas mixing chamber is arranged in the inner high oxygen reaction chamber, including a flared portion 9 at the bottom, a gas collecting bucket portion 10 at the top, and a gas mixing reaction chamber between the flared portion 9 and the gas collecting bucket portion 10 The gas collecting chamber 11 is provided with an exhaust pipe 21 on the top of the gas collecting bucket, and the exhaust pipe is introduced into a gas recovery chamber 22 connected thereto. The gas recovery chamber is connected with a gas-water separation valve 12, and the gas distribution pipe of the gas-water separation valve 12 is connected to a gas filter 13. The other end of the gas filter 13 is connected to the reactive oxygen supplier 6 through a gas transmission pipe. An oxygen supply pipe 15 is provided inside the gas mixing reaction chamber 11, and one end of the oxygen supply pipe 15 is connected to the reactive oxygen supplier 6, and the other end of the oxygen supply pipe 15 extends to the intersection of the flared portion 9 and the gas mixing reaction chamber 11 and is suspended with a micronized jet nozzle 17. The gas mixing reaction chamber 11 is also provided with a plurality of outgoing drainage pipes 18.

[0015] The organic wastewater after the initial treatment first enters from the first-order water inlet at the top of the main reaction tank 3. The main reaction tank 3 will absorb the excess oil that cannot react due to the absorption and filtering effect of the oil filter absorber 5, and then spray it out through the central repeated jet suction filter head. The reaction liquid is added to the main reaction tank to enhance the reaction effect. The treated water sprayed by the central repeated jet suction filter head is just sprayed into the bell-type mixing chamber set above. When entering, the entire main reaction tank 3 will pass through the reaction filter frame and then enter the bell-type mixing chamber. The biological reaction microorganisms in the reaction filter frame The filter membrane can mainly filter impurities and oil, so that the organic wastewater entering the reaction is free of impurities or with less impurities. Then molecular oxygen is supplied through the internal micro-jet nozzle to carry out short-range nitrification-denitrification biological denitrification. Excess oxygen will go up into the gas recovery chamber, and then enter the gas filter device after water vapor separation. After filtering, it enters the oxygen supply pipe or reaction oxygen supplier again to complete the circulation and recovery of molecular oxygen supply. Excess reaction water can be discharged through the drain pipe at the bottom. If the water pressure is not enough in the middle, a water pump or a booster pump can be added.

[0016] Preferably, a heater 19 is further provided in the equivalent reaction chamber to increase the temperature supply and maintain the biological reaction temperature of maximum activity under low temperature conditions, such as early spring and winter.

[0017] Preferably, a pressure relief valve 20 is provided at the root of the gas collecting bucket, which can be used as an emergency exhaust device to discharge excess reaction oxygen or mixed gas.

[0018] The whole denitrification reactor group is a fast and efficient biological wastewater treatment process for desulfurization and denitrification. Fast-growing denitrifying bacteria are selected to improve the nitrate-nitrogen concentration of the wastewater that can be treated and the volumetric efficiency of the reactor. Laboratory tests show that the influent nitrate-nitrogen concentration of the denitrification process is as high as 2000 mg / L, the granular sludge concentration is as high as 30~40 g / L, the denitrification activity is as high as 1.5 g NO3¯-N / (g VSS·d), and the volumetric load is as high as 58 kg N / (m³·d). The volumetric efficiency of this denitrification process is dozens of times that of the traditional denitrification process.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly efficient full-process denitrification reactor group, characterized by: It comprises a spray-type bioreactor (1) and a strong reaction type reactor (2), wherein a first-order reaction water delivery pipe is arranged on the reaction water outlet of the spray-type bioreactor (1) and connected to a first-order water inlet arranged on the top of the strong reaction type reactor (2); The strong reaction type reactor (2) comprises a main reaction tank (3), a bell-type gas mixing chamber (4), an oil filter absorber (5), and a reaction oxygen supplier (6); a reaction filter frame (7) surrounded by a biological reaction microfiltration membrane is arranged in the center of the main reaction tank (3), and the reaction filter frame divides the entire main reaction tank (3) into an inner high oxygen reaction chamber (8) inside the reaction filter frame and an equivalent reaction chamber outside the reaction filter frame; an oil filter absorber is arranged at the bottom outside the main reaction tank, and a repeated jet suction filter head of the oil filter absorber is inserted into the bottom of the main reaction tank; the bell-type gas mixing chamber is arranged in the inner high oxygen reaction chamber, and comprises a flared portion (9) at the bottom, a gas collecting bucket portion (10) at the top, and a gas mixing reaction chamber between the flared portion (9) and the gas collecting bucket portion (10). A reaction chamber (11) is provided, an exhaust pipe is also provided on the top of the gas collecting bucket, the exhaust pipe is led into a gas recovery chamber connected thereto, a gas-water separation valve (12) is provided on the gas recovery chamber, a gas distribution pipe of the gas-water separation valve (12) is connected to a gas filter device (13), the other end of the gas filter device (13) is connected to the reaction oxygen supplier (6) through a gas transmission pipe, an oxygen supply pipe (15) is provided inside the gas mixing reaction chamber, one end of the oxygen supply pipe (15) is connected to the reaction oxygen supplier (6), the other end of the oxygen supply pipe (15) extends to the intersection of the expanded portion (9) and the gas mixing reaction chamber (11) and is suspended with a micronized jet nozzle (17), and a plurality of outgoing drainage pipes (18) are also provided on the gas mixing reaction chamber (11); A heater (19) is also provided in the equivalent reaction chamber (11), and a pressure relief valve (20) is provided at the root of the gas collecting hopper (10).

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