Method for saving adding amount of inorganic carbon source in aeration tank

Abstract

The invention relates to a method for saving the adding amount of an inorganic carbon source in an aeration tank, the method is completed through an aeration tank inorganic carbon source adding amount system, the aeration tank inorganic carbon source adding amount system comprises an odor treatment induced draft fan, a discharge chimney, a gas flowmeter, an odor treatment pipeline and an aeration tank air inlet pipeline, a connecting pipeline is additionally arranged between the odor treatment pipeline between the odor treatment induced draft fan and the exhaust chimney and the air inlet pipeline of the aeration tank, and a gate valve and a gas flow meter are arranged on the connecting pipeline. The labor intensity of workers is reduced, meanwhile, the odor treatment amount is reduced, odor treatment tail gas is recycled, and the emission amount of carbon dioxide in the atmosphere is reduced to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for saving the dosage of inorganic carbon source in an aeration tank. Background Art

[0002] As the core unit of sewage biochemical treatment, aeration tank is responsible for reducing COD and converting ammonia nitrogen into nitrate nitrogen and nitrite nitrogen. The microorganisms that realize the nitrification reaction of ammonia nitrogen are chemoautotrophic microorganisms. The energy source of this type of microorganism is reduced inorganic matter, and the carbon source is carbon dioxide and carbonate.

[0003] Due to the lack of inorganic carbon sources in the aeration tank, in order to ensure the normal proliferation of chemoautotrophic microorganisms, it is usually necessary to artificially add industrial sodium carbonate into the aeration tank as an inorganic carbon source. Taking an aeration tank with a processing capacity of 100 cubic meters per hour and an influent ammonia nitrogen content of about 50 mg / L as an example, 3.5 tons of industrial sodium carbonate need to be added every day to achieve the standard requirement of maintaining the alkalinity in the aeration tank at 80-150 mg / L. For sewage treatment units, this not only requires a large amount of investment in chemical costs, but also requires an increase in the heavy labor intensity of employees.

[0004] In addition, with the continuous improvement of environmental protection standards, it has become a major trend for sewage treatment units to cover the pool to collect odorous gases for biological deodorization treatment. After odor treatment, the content of carbon dioxide in the exhaust gas used for microbial degradation is about 1%, which is much higher than the 0.03% content of carbon dioxide in the air. This is not conducive to the realization of carbon emission targets, affects the surrounding ecological environment, and causes environmental pollution. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a method for saving the dosage of inorganic carbon source in an aeration tank. The method collects odor treatment tail gas in a sewage tank during sewage treatment, and uses carbon dioxide in the odor treatment tail gas to add into the aeration tank, thereby reducing the dosage of industrial sodium carbonate required in the aeration tank, which can greatly save the dosage of industrial sodium carbonate in the traditional aeration tank. The content of carbon dioxide in the odor treatment tail gas is measured by a gas flow meter, and the opening of a gate valve in an odor treatment pipeline is controlled to automatically control the content of carbon dioxide in the odor treatment tail gas entering the aeration tank, thereby reducing the labor intensity of employees and the odor treatment amount. The odor treatment tail gas is recycled, and the emission of carbon dioxide in the atmosphere is reduced to a certain extent.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for saving the dosage of inorganic carbon source in an aeration tank, the method is completed by an inorganic carbon source dosage system for an aeration tank, the inorganic carbon source dosage system for an aeration tank comprises an odor treatment induced draft fan, an emission chimney, an odor treatment pipeline and an aeration tank air inlet pipeline, a connecting pipeline is added between the odor treatment induced draft fan and the emission chimney and the odor treatment pipeline and the aeration tank air inlet pipeline, a gate valve and a gas flow meter are arranged on the connecting pipeline, and the method for saving the dosage of inorganic carbon source in an aeration tank specifically comprises the following contents:

[0008] S1. A connecting pipe is added between the odor treatment pipe and the air inlet pipe of the aeration tank. A gate valve is set on the connecting pipe to control the amount of odor treatment tail gas entering the connecting pipe. A gas flow meter is set on the connecting pipe to transmit the gas flow data in the connecting pipe to the control system of the sewage treatment central control room. The opening of the gate valve is adjusted by the flow measured by the gas flow meter.

[0009] S2. Install a sampling ball valve on the odor treatment pipeline near the odor treatment induced draft fan to sample the odor treatment tail gas. After the gas composition analysis of the odor treatment tail gas, calculate the carbon dioxide content in the air inlet pipe of the aeration tank based on the carbon dioxide content in the odor treatment tail gas in the gas analysis and the opening of the gate valve in the connecting pipeline. Then, calibrate the utilization of the odor treatment tail gas in the connecting pipeline based on the alkalinity test results of the aeration tank and the effect of the nitrification reaction, correct the opening of the gate valve on the connecting pipeline, and gradually reduce the dosage of industrial sodium carbonate in the aeration tank.

[0010] S3. When the aeration tank is under maintenance, close the gate valve, close the gas transmission connection between the odor treatment pipeline and the aeration tank air inlet pipeline, and all exhaust gas will be discharged through the exhaust chimney.

[0011] Furthermore, an aeration fan is provided on the aeration tank air inlet pipe connecting the pipe to the aeration tank.

[0012] Furthermore, the aeration fan provides odor-treated tail gas and air to the aeration tank.

[0013] Furthermore, the sampling ball valve is opened when analyzing gas components and is closed at other times.

[0014] Furthermore, the aeration tank air inlet pipe is provided with an inlet valve in the reverse airflow direction at the connection position of the connecting pipe.

[0015] Furthermore, the inlet valve controls the amount of air entering the air inlet pipe of the aeration tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By using carbon dioxide in odor-treated tail gas as an inorganic carbon source for the aeration tank, the dosage of industrial sodium carbonate in the aeration tank can be greatly reduced, the operating cost of the aeration tank can be reduced, the operating efficiency of the aeration tank can be improved, and the sewage treatment benefits can be increased. Taking an aeration tank with a treatment capacity of 100 cubic meters per hour and an influent ammonia nitrogen content of about 50 mg / L as an example, 3,000 cubic meters of tail gas with a 6% content can be reused per hour, which can reduce the dosage of industrial sodium carbonate from 3.5 tons / day to 2 tons / day, saving 1.5 million yuan in pharmaceutical costs each year.

[0018] 2. Due to the reduction in the amount of reagent added, the data of the odor treatment tail gas measured by the gas flow meter is used to automatically control the incoming amount of the odor treatment tail gas and the incoming amount of air through the control system in the central control room, thereby controlling the incoming amount and flow rate of carbon dioxide into the aeration tank, which can greatly reduce the labor intensity of employees, reduce the workload of employees, improve the sewage treatment efficiency of the aeration tank, and improve the sewage treatment effect of the aeration tank.

[0019] 3. The tail gas from odor treatment is recycled as an inorganic carbon source in the aeration tank, achieving the effect of treating waste with waste, reducing atmospheric carbon emissions to a certain extent, reducing pollution to the surrounding ecological environment, and improving the quality of the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention discloses a flow chart of a system for saving the dosage of inorganic carbon source in an aeration tank.

[0021] In the figure: P1. Odor treatment induced draft fan; P2. Exhaust chimney; P3. Gas flow meter; P4. Aeration blower; L1. Odor treatment pipeline; L2. Aeration tank air inlet pipeline; L3. Connecting pipeline; F1. Inlet valve; F2. Gate valve; F3. Sampling ball valve. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0023] like Figure 1As shown, the working principle of a system for saving the dosage of inorganic carbon source in an aeration tank is as follows: a connecting pipe L3 is connected between an aeration tank air inlet pipe L2 and an odor treatment pipe L1, the odor treatment tail gas in the odor treatment pipe L1 is introduced into the aeration tank through the connecting pipe L3, the flow rate of the odor treatment tail gas is measured by a gas flow meter P3 in the connecting pipe L3, the odor treatment tail gas is sampled according to the sampling ball valve F3 on the odor treatment pipe L1, the content of carbon dioxide in the odor treatment tail gas is calculated, and then according to the alkali concentration and digestion reaction speed of the sewage in the aeration tank, the opening of the gate valve F2 on the connecting pipe L3 is corrected through the control system of the central control room, so as to control the content of carbon dioxide in the odor treatment tail gas entering the aeration tank, thereby reducing the dosage of industrial sodium carbonate in the aeration tank, reducing the operating cost of the aeration tank, improving the operating efficiency of the aeration tank, and increasing the income from sewage treatment.

[0024] like Figure 1 As shown, a method for saving the dosage of inorganic carbon source in an aeration tank is completed by an inorganic carbon source dosage system for an aeration tank, wherein the inorganic carbon source dosage system for an aeration tank comprises an odor treatment induced draft fan P1, an emission chimney P2, an odor treatment pipeline L1 and an aeration tank air inlet pipeline L2, wherein the odor treatment pipeline L1 between the odor treatment induced draft fan P1 and the emission chimney P2 and the aeration tank air inlet pipeline L2 are provided with a connecting pipeline L3, and a gate valve F2 and a gas flow meter P3 are provided on the connecting pipeline L3, wherein the method for saving the dosage of inorganic carbon source in an aeration tank specifically comprises the following contents:

[0025] S1. A connecting pipe L3 is added between the odor treatment pipe L1 and the aeration tank air inlet pipe L2. A gate valve F2 is provided on the connecting pipe L3 to control the amount of odor treatment tail gas entering the connecting pipe L3. A gas flow meter P3 is provided on the connecting pipe L3 to transmit the gas flow data in the connecting pipe L3 to the control system of the sewage treatment central control room. The opening of the gate valve F2 is adjusted by the flow measured by the gas flow meter P3.

[0026] S2. Install a sampling ball valve F3 on the odor treatment pipeline L1 near the odor treatment induced draft fan P1 to sample the odor treatment tail gas. After the gas composition analysis of the odor treatment tail gas, calculate the carbon dioxide content in the odor treatment tail gas in the gas analysis according to the opening of the gate valve F2 in the connecting pipeline L3, and then correct the utilization of the odor treatment tail gas in the connecting pipeline L3 in combination with the alkalinity test results of the aeration tank and the effect of the nitrification reaction. Correct the opening of the gate valve F2 on the connecting pipeline L3 through the control system in the central control room, thereby controlling the carbon dioxide content in the odor treatment tail gas entering the aeration tank, and then gradually reducing the amount of industrial sodium carbonate added to the aeration tank;

[0027] S3. When the aeration tank is under maintenance, the gate valve F2 is closed, and the gas transmission connection between the odor treatment pipeline L1 and the aeration tank air inlet pipeline L2 is closed, and all the exhaust gas is discharged through the exhaust chimney P2.

[0028] Furthermore, an aeration fan P4 is arranged on the aeration tank air inlet pipe L2 leading to the aeration tank from the connecting pipe L3. The aeration fan P4 is arranged on the aeration tank air inlet pipe L2 near the aeration tank to provide the aeration tank with the odor-treated tail gas introduced into the connecting pipe L3 and the air introduced into the aeration tank air inlet pipe L2. The aeration fan P4 ensures that all the odor-treated tail gas in the connecting pipe L3 is provided to the aeration tank, and at the same time ensures that the air flow introduced into the aeration tank meets the standard, ensures that the dissolved oxygen in the aeration tank meets the standard requirements, and meets the proliferation and metabolism of aerobic microorganisms.

[0029] Furthermore, the sampling ball valve F3 is opened when analyzing gas components and is closed at other times.

[0030] Furthermore, the aeration tank air inlet pipe L2 is provided with an inlet valve F1 in the reverse airflow direction at the connection position of the connecting pipe L3.

[0031] Furthermore, the inlet valve F1 controls the amount of air entering the air inlet pipe L2 of the aeration tank, ensuring that the dissolved oxygen content in the air entering the aeration tank meets the standard requirements and satisfies the proliferation and metabolism of aerobic microorganisms.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0033] [Example] Figure 1 As shown, a DN500mm hole is opened on the odor treatment pipe L1 between the odor treatment induced draft fan P1 and the odor treatment exhaust chimney P2, about 1 meter away from the chimney P2.

[0034] Between the aeration blower P4 and the inlet valve F1, a DN500mm hole is opened about 1 meter in the aeration tank air inlet pipe L2 after the inlet valve F1.

[0035] Connect the holes of the odor treatment pipe L1 and the aeration tank air inlet pipe L2 through the DN500mm connecting pipe L3, and ensure that the horizontal straight pipe section length of the connecting pipe L3 is not less than 13 meters.

[0036] Install a DN500mm gate valve F2 on the connecting pipe L3 about 1 meter away from the odor treatment pipe L1.

[0037] A gas flow meter P3 is installed on the horizontal straight pipe section behind the gate valve F2 of the connecting pipe L3. The gas flow meter P3 measures the flow of the odor treatment tail gas in the connecting pipe L3, and transmits the odor treatment tail gas flow data of the gas flow meter P3 to the control system of the sewage treatment central control room.

[0038] A sampling DN15mm ball valve F3 is installed on the odor treatment pipeline L1 about 500mm away from the odor treatment induced draft fan P1 to take samples for gas composition analysis and analyze the carbon dioxide content in the odor treatment tail gas.

[0039] When in use, first open the ball valve F3 to sample and analyze the gas composition, open the gate valve F2 according to the carbon dioxide content in the odor treatment tail gas, adjust the opening of the gate valve F2 by calculating the flow rate through the gas flowmeter, and finally correct the utilization of the odor treatment tail gas in combination with the alkalinity test results of the aeration tank and the effect of the nitrification reaction, and correct the opening of the gate valve F2 on the connecting pipe L3 through the control system in the central control room, so as to control the carbon dioxide content in the odor treatment tail gas entering the aeration tank, and then gradually reduce the amount of industrial sodium carbonate added to the aeration tank.

Claims

1. A method for saving the dosage of inorganic carbon source in an aeration tank, the method is completed by an inorganic carbon source dosage system for an aeration tank, the inorganic carbon source dosage system for an aeration tank comprising an odor treatment induced draft fan, an exhaust chimney, an odor treatment pipeline and an aeration tank air inlet pipeline, characterized in that: A connecting pipe is added between the odor treatment pipeline between the odor treatment induced draft fan and the emission chimney and the aeration tank air inlet pipe, and a gate valve and a gas flow meter are arranged on the connecting pipe. The method for saving the dosage of inorganic carbon source in the aeration tank specifically includes the following contents: S1. A connecting pipe is added between the odor treatment pipe and the air inlet pipe of the aeration tank. A gate valve is set on the connecting pipe to control the amount of odor treatment tail gas entering the connecting pipe. A gas flow meter is set on the connecting pipe to transmit the gas flow data in the connecting pipe to the control system of the sewage treatment central control room. The opening of the gate valve is adjusted by the flow measured by the gas flow meter. S2. Install a sampling ball valve on the odor treatment pipeline near the odor treatment induced draft fan to sample the odor treatment tail gas. After the gas composition analysis of the odor treatment tail gas, calculate the carbon dioxide content in the air inlet pipe of the aeration tank based on the carbon dioxide content in the odor treatment tail gas in the gas analysis and the opening of the gate valve in the connecting pipeline. Then, calibrate the utilization of the odor treatment tail gas in the connecting pipeline based on the alkalinity test results of the aeration tank and the effect of the nitrification reaction, correct the opening of the gate valve on the connecting pipeline, and gradually reduce the dosage of industrial sodium carbonate in the aeration tank. S3. When the aeration tank is under maintenance, close the gate valve, close the gas transmission connection between the odor treatment pipeline and the aeration tank air inlet pipeline, and all exhaust gas will be discharged through the exhaust chimney.

2. A method for saving the dosage of inorganic carbon source in an aeration tank according to claim 1, characterized in that: An aeration fan is arranged on the aeration tank air inlet pipe leading from the connecting pipe to the aeration tank.

3. A method for saving the dosage of inorganic carbon source in an aeration tank according to claim 2, characterized in that: The aeration fan provides odor-treated tail gas and air to the aeration tank.

4. The method for saving the dosage of inorganic carbon source in an aeration tank according to claim 1, characterized in that: The sampling ball valve is opened when analyzing gas components and is closed at other times.

5. The method for saving the dosage of inorganic carbon source in an aeration tank according to claim 1, characterized in that: The aeration tank air inlet pipe is provided with an inlet valve in the reverse airflow direction at the connection position of the connecting pipe.

6. A method for saving the dosage of inorganic carbon source in an aeration tank according to claim 5, characterized in that: The inlet valve controls the amount of air entering the air inlet pipe of the aeration tank.

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