Device with functions of breeding wastewater treatment and nitrous oxide reduction

Abstract

The utility model discloses a device for treating breeding wastewater and reducing nitrous oxide, and relates to the field of wastewater treatment. The device comprises a short-range nitrosation reactor, an anaerobic ammonia oxidation reactor, an aeration device, a stirring device, a water quality detection device, a middle water tank, a water outlet tank and a control computer, which are sequentially connected through water pipes, the aeration device is mounted on the short-range nitrosation reactor, and stirring devices are mounted on the short-range nitrosation reactor and the anaerobic ammonia oxidation reactor; the water quality detection device is mounted on the short-range nitrosation reactor and the anaerobic ammonia oxidation reactor; and the aeration device, the stirring device and the water quality controller are all connected with the control computer. According to the utility model, the aeration time and intermittent aeration are dynamically controlled according to the change of effluent quality, the ultrasonic device is additionally arranged, the permeability of the microbial film is enhanced, fine control is carried out through the control computer, and the automation degree is high.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to a device for treating aquaculture wastewater and reducing nitrous oxide, which has a high degree of automation, effectively enhances the stability of the denitrification process and reduces the impact of greenhouse gas N2O on the atmospheric environment. Background Art

[0002] Aquaculture wastewater is the excrement of fish, shrimp, livestock and other animals. Its water quality is characterized by high concentrations of ammonia nitrogen and chemical oxygen demand (COD). Urban sewage treatment plants have poor capacity to treat this type of wastewater, which often results in wastewater quality that does not meet standards. In addition, aquaculture wastewater often contains high concentrations of antibiotics and a large number of pathogenic microorganisms. Once these toxic and harmful pollutants are discharged into natural water bodies, they enter the bodies of animals through the water environment ecological food chain, which can threaten human health in serious cases.

[0003] The excessive discharge of aquaculture wastewater has caused the water quality of urban sewage treatment to be substandard, and the discharge into natural water bodies is prone to cause eutrophication of water bodies. The short-range nitrification coupled anaerobic ammonia oxidation nitrogen process has the advantages of high denitrification efficiency, low aeration volume, low energy consumption and operating costs compared with the traditional nitrification-denitrification biological denitrification process. However, this coupled denitrification process is easily affected by the environment and difficult to operate stably, which limits the realization of mainstream engineering promotion and application. Traditional anaerobic ammonia oxidation process commonly includes pH control, temperature, dissolved oxygen control and addition of hydroxylamine or other chemical agents, which requires artificial control of process parameters. Complex and cumbersome. In addition, greenhouse gas nitrous oxide (N2O) is often produced as a by-product of the anaerobic ammonia oxidation process, which has a strong greenhouse effect and damages the atmosphere. Therefore, the release of greenhouse gases reduces the energy-saving and emission reduction efficiency of anaerobic ammonia oxidation, and also limits the application value of the process promotion. However, due to the continuous increase in the amount of urban sewage treatment in my country, the total amount of N2O produced is also growing, which seriously damages the sustainable development of the ecological environment, especially the stability of the atmospheric environment. Summary of the invention

[0004] The utility model aims to solve the problem of stable operation of the denitrification process and difficult control of N2O reduction in the nitrogen-containing wastewater treatment technology, and provides a device for aquaculture wastewater treatment and nitrous oxide reduction, which has a high degree of automation, effectively enhances the stability of the denitrification process and reduces the impact of greenhouse gas N2O on the atmospheric environment.

[0005] The utility model discloses a device for treating aquaculture wastewater and reducing nitrous oxide, characterized in that the reducing device comprises a short-range nitrite reactor, an anaerobic ammonium oxidation reactor, an aerator, a stirring device, a water quality detection device, an intermediate water tank, an outlet water tank and a control computer, wherein the short-range nitrite reactor, the intermediate water tank, the anaerobic ammonium oxidation reactor and the outlet water tank are sequentially connected through water pipes, the aerator is installed on the short-range nitrite reactor, and the short-range nitrite reactor and the anaerobic ammonium oxidation reactor are both equipped with a stirring device; the water quality detection device comprises a dissolved oxygen probe, an N2O probe, a temperature probe and a pH probe, a water quality controller and an N2O amplifying electrode, the short-range nitrite reactor is provided with a dissolved oxygen probe and an N2O probe, the anaerobic ammonium oxidation reactor is provided with a dissolved oxygen probe, an N2O probe, a temperature probe and a pH probe, the N2O probe is connected to the N2O amplifying electrode through a wire, the dissolved oxygen probe, the temperature probe and the pH probe are all connected to the water quality controller through a wire, and the aerator, the stirring device and the water quality controller are all connected to the control computer.

[0006] The aeration device comprises an aeration pump, a rotor flowmeter and an aeration plate. The rotor flowmeter is installed on the outer wall of the short-range nitrification reactor, and the aeration plate is placed in the short-range nitrification reactor. The aeration pump, the rotor flowmeter and the aeration plate are sequentially connected through an air pipe, and the aeration pump is connected to a control computer through a data line.

[0007] The stirring device comprises a stirring motor and stirring blades. The stirring blades are arranged on the rotating shaft of the stirring motor. The stirring motor is connected to a control computer through a wire.

[0008] The reduction device also includes a water inlet device and a water outlet device. The water inlet device includes a peristaltic pump and a water inlet controller. The peristaltic pumps are respectively installed on the water inlet pipe of the short-range nitrite reactor and the water inlet pipe between the intermediate water tank and the anaerobic ammonia oxidation reactor. The water inlet controller is connected to the peristaltic pump through a wire and connected to the control computer through a data line. The water outlet device includes a drainage solenoid valve and a drainage controller. The drainage solenoid valves are respectively installed on the water outlet pipe between the short-range nitrite reactor and the intermediate water tank and the water outlet pipe between the anaerobic ammonia oxidation reactor and the water outlet tank. The drainage controller is connected to the drainage solenoid valve through a wire and connected to the control computer through a data line.

[0009] The reduction device is also provided with an ultrasonic device, which includes an ultrasonic generator and an ultrasonic rod. The ultrasonic generator is arranged between the short-range nitrite reactor and the anaerobic ammonium oxidation reactor, and two ultrasonic rods are respectively placed in the short-range nitrite reactor and the anaerobic ammonium oxidation reactor, and the ultrasonic rods are connected to the ultrasonic generator through wires.

[0010] The utility model combines aquaculture wastewater treatment and nitrous oxide reduction device, can dynamically control aeration time and intermittent aeration according to the change of effluent water quality, provide necessary reaction substrates nitrous acid and ammonia nitrogen substrate for subsequent anaerobic ammonia oxidation reaction; and add ultrasonic device to enhance the permeability of microbial membrane, improve the efficiency of electron transport chain, enhance the substrate mass transfer capacity, enhance the activity of microbial enzymes and other characteristics, alleviate the problem of rapid increase in the production of process N2O; through the control computer for fine control, it has high degree of automation, no need to add chemicals, saves labor and other operating costs, occupies a small area, simple and convenient process operation, flexible and changeable, easy maintenance, can effectively enhance the stability of denitrification process and reduce the impact of greenhouse gas N2O on the atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model.

[0012] Among them, 1-aquaculture wastewater, 2-peristaltic pump, 3-short-range nitrite reactor, 4-intermediate water tank, 5-anaerobic ammonium oxidation reactor, 6-outlet water tank, 7-aeration pump, 8-rotor flowmeter, 9-aeration plate, 10-stirring device, 11-dissolved oxygen probe, 12-N2O probe, 13-drainage solenoid valve, 14-temperature probe, 15-pH probe, 16-water quality controller, 17-water inlet controller, 18-drainage controller, 19-N2O amplifying electrode, 20-control computer, 21-ultrasonic generator, 22 ultrasonic rod. DETAILED DESCRIPTION

[0013] Embodiment 1: A device for treating aquaculture wastewater and reducing nitrous oxide, comprising a short-range nitrite reactor, an anaerobic ammonium oxidation reactor, an aerator, a stirring device, a water quality detection device, an intermediate water tank, an outlet water tank and a control computer, wherein the short-range nitrite reactor, the intermediate water tank, the anaerobic ammonium oxidation reactor and the outlet water tank are sequentially connected by water pipes, the aerator is installed on the short-range nitrite reactor, and the short-range nitrite reactor and the anaerobic ammonium oxidation reactor are both equipped with a stirring device; the water quality detection device comprises a dissolved oxygen probe, a N2O probe, a temperature probe and a pH probe, a water quality controller and a N 2O amplifying electrode, the short-range nitrite reactor is provided with a dissolved oxygen probe and a N2O probe, the anaerobic ammonium oxidation reactor is provided with a dissolved oxygen probe, a N2O probe, a temperature probe and a pH probe, the N2O probe is connected to the N2O amplifying electrode through a wire, the dissolved oxygen probe, the temperature probe and the pH probe are all connected to the water quality controller through a wire, the aeration device, the stirring device and the water quality controller are all connected to the control computer; the water quality controller adopts the BT-7000 multi-parameter water quality online analyzer of Bebur Company; the short-range nitrite reactor and the anaerobic ammonium oxidation reactor are both cylindrical reactors.

[0014] The aeration device includes an aeration pump, a rotor flowmeter and an aeration plate. The rotor flowmeter is installed on the outer wall of the short-range nitrite reactor, and the aeration plate is placed in the short-range nitrite reactor. The aeration pump, the rotor flowmeter and the aeration plate are connected in sequence through air pipes, and the aeration pump is connected to the control computer through a data line.

[0015] The stirring device comprises a stirring motor and stirring blades. The stirring blades are arranged on the rotating shaft of the stirring motor. The stirring motor is connected with a control computer through a wire.

[0016] The reduction device also includes a water inlet device and a water outlet device. The water inlet device includes a peristaltic pump and a water inlet controller. The peristaltic pumps are respectively installed on the water inlet pipe of the short-range nitrite reactor and the water inlet pipe between the intermediate water tank and the anaerobic ammonia oxidation reactor. The water inlet controller is connected to the peristaltic pump through a wire and connected to the control computer through a data cable. The water inlet controller adopts the water inlet controller S7-1200 of Siemens; the water outlet device includes a drain solenoid valve and a drain controller. The drain solenoid valves are respectively installed on the water outlet pipe between the short-range nitrite reactor and the intermediate water tank and the water outlet pipe between the anaerobic ammonia oxidation reactor and the water outlet tank. The drain controller is connected to the drain solenoid valve through a wire and connected to the control computer through a data cable. The drain controller adopts the drain controller BZ202 of Bizhen Digital Technology Co., Ltd.

[0017] The reduction device is also provided with an ultrasonic device, which includes an ultrasonic generator and an ultrasonic rod. The ultrasonic generator is arranged between the short-range nitrite reactor and the anaerobic ammonium oxidation reactor. Two ultrasonic rods are respectively placed in the short-range nitrite reactor and the anaerobic ammonium oxidation reactor. The ultrasonic rods are connected to the ultrasonic generator through wires.

[0018] The wastewater to be treated by the utility model is aquaculture wastewater, which is characterized by high chemical oxygen demand COD concentration and high ammonia nitrogen concentration. Generally, its water quality characteristics are ammonia nitrogen concentration of 300-2000mgN / L and COD concentration of 800-5000mg / L, which meet the water quality characteristics required by the short-range nitrification process.

[0019] The aquaculture wastewater enters the short-range nitrite reactor through a peristaltic pump for reaction; then enters the intermediate water tank for balancing the short-range nitrite water volume and water quality; finally enters the anaerobic ammonium oxidation reactor from the intermediate water tank through a peristaltic pump for reaction; the above-mentioned short-range nitrite reactor and anaerobic ammonium oxidation reactor are also provided with an automatic control system for controlling aeration, temperature, stirring device, water inlet and water outlet during the reaction process; the above-mentioned short-range nitrite reactor and anaerobic ammonium oxidation reactor are also provided with an ultrasonic device for enhancing the stability of the reaction process and the production of N2O.

[0020] This device treats aquaculture wastewater containing high ammonia nitrogen concentration in two steps. First, the aquaculture wastewater is subjected to short-term nitrification treatment and then to anaerobic ammonia oxidation denitrification treatment. The entire reaction process is controlled by automated devices and is equipped with water quality detection devices and ultrasonic treatment devices.

[0021] In the process of short-range nitrification, ammonia nitrogen is converted into nitrite by aerobic ammonia oxidizing bacteria AOB without further oxidation to nitrate. The specific reaction principle is: NH3 + +1.5O2→NO2 - +H + +H2O.

[0022] In the process of anaerobic ammonia oxidation treatment, the remaining ammonia nitrogen and nitrite from the short-range nitrification treatment are anaerobic oxidized into nitrogen stripping process. The specific reaction principle is:

[0023] NH4 + +1.32NO2 - +0.066HCO3 - +0.13H + →0.26NO3 - +1.02N2+0.066CH2O 0.5 N 0.15 +2.03H2O.

[0024] The above-mentioned short-range nitritation reactor is used to carry out short-range nitritation denitrification reaction treatment on aquaculture wastewater containing ammonia nitrogen. First, the high ammonia nitrogen in the aquaculture wastewater is converted into nitrite nitrogen, providing the required reaction substrates ammonia nitrogen and nitrite for the subsequent anaerobic ammonia oxidation reaction. At the same time, it also reduces the content of COD and other toxic and harmful substances in the aquaculture wastewater, solving the problem of anaerobic ammonia oxidizing bacteria AnAOB being sensitive to the environment.

[0025] In the above-mentioned short-range nitrification treatment process, the automatic control device is used to control the dissolved oxygen to 0.6-1.2 mg / L, the temperature to 25-30°C, the hydraulic retention time to 3-6h, and the total N2O emission level to exceed 1.2 mg / L; in the above-mentioned anaerobic ammonium oxidation treatment process, the temperature is controlled to 25-30°C, the pH is 6.4-7.7, the dissolved oxygen is less than 0.5 mg / L, the hydraulic retention time is 3-6h, and the total N2O emission level exceeds 1.2 mg / L; it effectively solves the problem of reduced treatment efficiency due to environmental changes in the short-range nitrification and anaerobic ammonium oxidation processes, and solves the operating costs caused by excessive oxygen consumption, excessive dosage of chemicals, and excessive sludge disposal fees during operation.

[0026] An ultrasonic device is added between the short-range nitrite reactor and the anaerobic ammonium oxidation reactor. Ultrasonic waves can enhance the permeability of microbial membranes, improve the efficiency of the electron transport chain, enhance the substrate mass transfer capacity, and improve the activity of microbial enzymes. It can promote the biological activity of ammonia oxidizing bacteria AOB and anaerobic ammonium oxidizing bacteria AnAOB, increase the stability of the coupling process, and effectively reduce the production of N2O during the denitrification process.

[0027] The short-range nitrite reactor is operated in the mode of water inlet-anaerobic stirring-aeration stirring-sedimentation-drainage, and operates 4 cycles per day; the anaerobic ammonium oxidation reactor is operated in the mode of water inlet-anaerobic stirring-sedimentation-drainage, and operates 4 cycles per day.

[0028] The registration number of the software used to control the overall reaction in the above-mentioned control computer is Software Registration No. 2472076.

Claims

1. A device for treating aquaculture wastewater and reducing nitrous oxide, characterized in that The reduction device comprises a short-range nitrification reactor, an anaerobic ammonium oxidation reactor, an aeration device, a stirring device, a water quality detection device, an intermediate water tank, an outlet water tank and a control computer. The short-range nitrification reactor, the intermediate water tank, the anaerobic ammonium oxidation reactor and the outlet water tank are sequentially connected through water pipes. The aeration device is installed on the short-range nitrification reactor. The short-range nitrification reactor and the anaerobic ammonium oxidation reactor are both equipped with a stirring device. The water quality detection device comprises a dissolved oxygen probe, an N2O probe, a temperature probe and a pH probe, a water quality controller and an N2O amplifying electrode. The short-range nitrification reactor is provided with a dissolved oxygen probe and an N2O probe. The anaerobic ammonium oxidation reactor is provided with a dissolved oxygen probe, an N2O probe, a temperature probe and a pH probe. The N2O probe is connected to the N2O amplifying electrode through a wire. The dissolved oxygen probe, the temperature probe and the pH probe are all connected to the water quality controller through a wire. The aeration device, the stirring device and the water quality controller are all connected to the control computer.

2. The device for treating aquaculture wastewater and reducing nitrous oxide according to claim 1, characterized in that The aeration device comprises an aeration pump, a rotor flowmeter and an aeration plate. The rotor flowmeter is installed on the outer wall of the short-range nitrification reactor, and the aeration plate is placed in the short-range nitrification reactor. The aeration pump, the rotor flowmeter and the aeration plate are sequentially connected through an air pipe, and the aeration pump is connected to a control computer through a data line.

3. The device for treating aquaculture wastewater and reducing nitrous oxide according to claim 1, characterized in that The stirring device comprises a stirring motor and stirring blades. The stirring blades are arranged on the rotating shaft of the stirring motor. The stirring motor is connected to a control computer through a wire.

4. The device for treating aquaculture wastewater and reducing nitrous oxide according to claim 1, characterized in that The reduction device also includes a water inlet device and a water outlet device. The water inlet device includes a peristaltic pump and a water inlet controller. The peristaltic pumps are respectively installed on the water inlet pipe of the short-range nitrite reactor and the water inlet pipe between the intermediate water tank and the anaerobic ammonia oxidation reactor. The water inlet controller is connected to the peristaltic pump through a wire and connected to the control computer through a data line. The water outlet device includes a drainage solenoid valve and a drainage controller. The drainage solenoid valves are respectively installed on the water outlet pipe between the short-range nitrite reactor and the intermediate water tank and the water outlet pipe between the anaerobic ammonia oxidation reactor and the water outlet tank. The drainage controller is connected to the drainage solenoid valve through a wire and connected to the control computer through a data line.

5. The device for treating aquaculture wastewater and reducing nitrous oxide according to claim 1, characterized in that The reduction device is also provided with an ultrasonic device, which is installed on the short-range nitrite reactor and the anaerobic ammonium oxidation reactor.

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