Method for saving inorganic carbon source dosage of aeration tank

Abstract

The present application relates to a kind of methods for saving aeration tank inorganic carbon source dosing quantity, the method is completed by aeration tank inorganic carbon source dosing quantity system, the aeration tank inorganic carbon source dosing quantity system includes odor treatment induced draft fan, discharge chimney, gas flow meter, odor treatment pipeline and aeration tank air inlet pipeline, a connecting pipeline is additionally provided between the odor treatment pipeline and the aeration tank air inlet pipeline between the odor treatment induced draft fan and the discharge chimney, gate valve and gas flow meter are arranged on the connecting pipeline, the beneficial effects of the present application: automatically control the content of carbon dioxide in the odor treatment tail gas into aeration tank, reduce the labor intensity of staff, while reducing the amount of odor treatment, odor treatment tail gas reaches recycling, to a certain extent, reduce the emission of carbon dioxide in atmosphere.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method for saving the amount of inorganic carbon source added to an aeration tank. Background Technology

[0002] As the core unit of wastewater biological treatment, the aeration tank plays a crucial role in reducing COD and converting ammonia nitrogen into nitrate and nitrite nitrogen. The microorganisms that enable the nitrification of ammonia nitrogen are chemoautotrophic microorganisms. These microorganisms obtain energy from reduced inorganic matter and carbon from carbon dioxide and carbonates.

[0003] Due to the lack of inorganic carbon sources in aeration tanks, industrial sodium carbonate is usually added artificially as an inorganic carbon source to ensure the normal proliferation of chemoautotrophic microorganisms. For example, for an aeration tank with a treatment capacity of 100 cubic meters per hour and an influent ammonia nitrogen level of about 50 mg / L, 3.5 tons of industrial sodium carbonate need to be added daily to maintain the alkalinity in the aeration tank at the standard requirement of 80-150 mg / L. For wastewater treatment units, this not only requires a large investment in reagents but also increases the workload 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 pools to collect odorous gases for biological deodorization. After odor treatment, the carbon dioxide content in the exhaust gas used for microbial degradation is about 1%, which is much higher than the 0.03% carbon dioxide content in the air. This is not conducive to the achievement of carbon emission targets, affects the surrounding ecological environment, and causes environmental pollution. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a method for saving the amount of inorganic carbon source added to aeration tanks. This method involves collecting odor-treated exhaust gas from the wastewater treatment process and adding the carbon dioxide from this exhaust gas into the aeration tank, thereby reducing the amount of industrial sodium carbonate required. This significantly reduces the amount of industrial sodium carbonate needed in traditional aeration tanks. A gas flow meter measures the carbon dioxide content in the odor-treated exhaust gas, controlling the opening of the gate valve in the odor treatment pipeline to automatically control the carbon dioxide content in the exhaust gas entering the aeration tank. This reduces the labor intensity of employees and decreases the amount of odor treated, achieving recycling of the odor-treated exhaust gas and reducing carbon dioxide emissions into the atmosphere to a certain extent.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A method for saving the dosage of inorganic carbon source in an aeration tank, the method being implemented through an inorganic carbon source dosage system for the aeration tank, the system comprising an odor treatment blower, an exhaust chimney, an odor treatment pipeline, and an air inlet pipeline for the aeration tank, wherein a connecting pipeline is added between the odor treatment pipeline and the exhaust chimney, and between the air inlet pipeline and the aeration tank, the connecting pipeline being equipped with a gate valve and a gas flow meter; the method for saving the dosage of inorganic carbon source in the aeration tank specifically includes the following:

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

[0009] S2. A sampling ball valve is installed on the odor treatment pipeline near the odor treatment exhaust fan to sample the odor treatment exhaust gas. After the gas composition of the odor treatment exhaust gas is analyzed, the carbon dioxide content in the odor treatment exhaust gas is calculated based on the carbon dioxide content in the gas analysis and the opening of the gate valve in the connecting pipeline. Then, the utilization amount of odor treatment exhaust gas in the connecting pipeline is corrected based on the alkalinity test results of the aeration tank and the effect of the nitrification reaction. The opening of the gate valve on the connecting pipeline is adjusted to gradually reduce the amount of industrial sodium carbonate added to the aeration tank.

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

[0011] Furthermore, an aeration fan is installed on the air inlet pipe of the aeration tank, which connects to the aeration tank.

[0012] Furthermore, the aeration blower supplies odor-treated exhaust gas and air to the aeration tank.

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

[0014] Furthermore, the air inlet pipe of the aeration tank is equipped with an inlet valve in the opposite airflow direction at the connection point of the connecting pipe.

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

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By using carbon dioxide from the odor-treated exhaust gas as an inorganic carbon source in the aeration tank, the amount of industrial sodium carbonate added to the aeration tank can be greatly reduced, thus lowering the operating cost of the aeration tank, improving its operating efficiency, and increasing the benefits of wastewater treatment. Taking an aeration tank with a treatment capacity of 100 cubic meters per hour and an influent ammonia nitrogen level of about 50 mg / L as an example, by reusing 3,000 cubic meters of exhaust gas with a 6% content per hour, the amount of industrial sodium carbonate added can be reduced from 3.5 tons / day to 2 tons / day, saving 1.5 million yuan in reagent costs annually.

[0018] 2. Due to the reduction in the dosage of the reagent, the amount of odor treatment exhaust gas entering the aeration tank and the amount of air entering the aeration tank are automatically controlled by the central control system based on the data of the odor treatment exhaust gas measured by the gas flow meter. This controls the amount and flow rate of carbon dioxide entering the aeration tank, which can greatly reduce the labor intensity and workload of employees, improve the wastewater treatment efficiency of the aeration tank, and improve the wastewater treatment effect of the aeration tank.

[0019] 3. Odor treatment exhaust gas 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 of the surrounding ecological environment, and improving the quality of the ecological environment. Attached Figure Description

[0020] Figure 1 This is a flowchart of a system for saving inorganic carbon source dosage in an aeration tank, as described in this invention.

[0021] In the diagram: P1. Odor treatment exhaust fan; P2. Exhaust chimney; P3. Gas flow meter; P4. Aeration blower; L1. Odor treatment pipeline; L2. Aeration tank inlet pipeline; L3. Connecting pipeline; F1. Inlet valve; F2. Gate valve; F3. Sampling ball valve. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0023] like Figure 1As shown, the working principle of a system for saving inorganic carbon source dosage in an aeration tank is as follows: A connecting pipe L3 connects the air inlet pipe L2 and the odor treatment pipe L1 of the aeration tank. 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 the gas flow meter P3 in the connecting pipe L3. The odor treatment tail gas is sampled by the sampling ball valve F3 on the odor treatment pipe L1, and the carbon dioxide content in the odor treatment tail gas is calculated. Then, based on the alkali concentration of the wastewater in the aeration tank and the digestion reaction rate, the opening of the gate valve F2 on the connecting pipe L3 is adjusted by the control system in the central control room, thereby controlling the carbon dioxide content in the odor treatment tail gas entering the aeration tank. This reduces the amount of industrial sodium carbonate added to the aeration tank, lowers the operating cost of the aeration tank, improves the operating efficiency of the aeration tank, and increases the benefits of wastewater treatment.

[0024] like Figure 1 As shown, a method for saving the amount of inorganic carbon source added to an aeration tank is implemented through an inorganic carbon source addition system for the aeration tank. This system includes an odor treatment blower P1, an exhaust chimney P2, an odor treatment pipe L1, and an aeration tank inlet pipe L2. A connecting pipe L3 is added between the odor treatment pipe L1 and the exhaust chimney P2, and between the odor treatment pipe L1 and the aeration tank inlet pipe L2. A gate valve F2 and a gas flow meter P3 are installed on the connecting pipe L3. The method for saving the amount of inorganic carbon source added to the aeration tank specifically includes the following:

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

[0026] S2. A sampling ball valve F3 is installed on the odor treatment pipeline L1 near the odor treatment induced draft fan P1 to sample the odor treatment exhaust gas. After gas composition analysis of the odor treatment exhaust gas, the carbon dioxide content in the odor treatment exhaust gas is calculated based on the gas analysis results. Combined with the opening degree of the gate valve F2 in the connecting pipeline L3, the carbon dioxide content in the air inlet pipeline L2 entering the aeration tank is calculated. Then, combined with the alkalinity test results of the aeration tank and the effect of the nitrification reaction, the utilization rate of the odor treatment exhaust gas in the connecting pipeline L3 is corrected. The opening degree of the gate valve F2 on the connecting pipeline L3 is corrected by the control system in the central control room, thereby controlling the carbon dioxide content in the odor treatment exhaust gas entering the aeration tank, and thus gradually reducing the amount of industrial sodium carbonate added to the aeration tank.

[0027] S3. When the aeration tank is under maintenance, close the gate valve F2 and shut off the gas supply connection of the connecting pipe L3 between the odor treatment pipe L1 and the air inlet pipe L2 of the aeration tank. All exhaust gas is discharged through the exhaust chimney P2.

[0028] Furthermore, an aeration blower P4 is installed on the aeration tank inlet air pipe L2, which connects to the aeration tank via the connecting pipe L3. The aeration blower P4 is located near the aeration tank on the aeration tank inlet air pipe L2, providing the aeration tank with the odor treatment exhaust gas from the connecting pipe L3 and the air from the aeration tank inlet air pipe L2. The aeration blower P4 ensures that all the odor treatment exhaust gas in the connecting pipe L3 is provided to the aeration tank, while also ensuring that the air flow rate into the aeration tank meets the standard, ensuring that the dissolved oxygen in the aeration tank meets the standard requirements, and satisfying the aerobic microbial proliferation and metabolism.

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

[0030] Furthermore, the air inlet pipe L2 of the aeration tank is equipped with an inlet valve F1 in the opposite 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 embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

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

[0034] A DN500mm hole is drilled about 1 meter from the aeration blower P4 to the inlet valve F1, in the air inlet pipe L2 of the aeration tank after the inlet valve F1.

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

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

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

[0038] A sampling DN15mm ball valve F3 is installed on the odor treatment pipeline L1 at a distance of about 500mm from the odor treatment exhaust fan P1. It is used to sample and analyze the gas composition, specifically the carbon dioxide content in the odor treatment exhaust gas.

[0039] In operation, first, open ball valve F3 to sample and analyze the gas composition. Based on the carbon dioxide content in the odor treatment tail gas, open gate valve F2. Adjust the opening of gate valve F2 by calculating the flow rate using a gas flow meter. Finally, combine the alkalinity test results of the aeration tank and the effect of the nitrification reaction to correct the utilization rate of the odor treatment tail gas. The opening of gate valve F2 on connecting pipe L3 is corrected by 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 gradually reducing the amount of industrial sodium carbonate added to the aeration tank.

Claims

1. A method for saving the amount of inorganic carbon source added to an aeration tank, the method being implemented through an inorganic carbon source addition system for the aeration tank, the aeration tank inorganic carbon source addition system comprising an odor treatment blower, an exhaust chimney, an odor treatment pipeline, and an air inlet pipeline for the aeration tank, characterized in that, A connecting pipe is added between the odor treatment pipe and the exhaust chimney, and between the odor treatment pipe and the aeration tank inlet pipe. A gate valve and a gas flow meter are installed on the connecting pipe. An aeration blower is installed on the aeration tank inlet pipe leading from the connecting pipe to the aeration tank. An inlet valve is installed on the aeration tank inlet pipe in the opposite airflow direction at the connection point of the connecting pipe. The method for saving the amount of inorganic carbon source added to the aeration tank specifically includes the following: S1. A connecting pipe is installed between the odor treatment pipe and the air inlet pipe of the aeration tank. A gate valve is installed on the connecting pipe to control the amount of odor treatment tail gas entering the connecting pipe. A gas flow meter is installed on the connecting pipe to transmit the gas flow data in the connecting pipe to the control system in the sewage treatment central control room. The opening of the gate valve is adjusted by the flow measured by the gas flow meter. S2. A sampling ball valve is installed on the odor treatment pipeline near the odor treatment exhaust fan to sample the odor treatment exhaust gas. After analyzing the gas composition of the odor treatment exhaust gas, the carbon dioxide content in the odor treatment exhaust gas obtained from the gas analysis is calculated based on the opening degree of the gate valve in the connecting pipeline. Then, combined with the alkalinity test results of the aeration tank and the effect of the nitrification reaction, the utilization rate of the odor treatment exhaust gas in the connecting pipeline is corrected, the opening degree of the gate valve on the connecting pipeline is adjusted, and the amount of industrial sodium carbonate added in the aeration tank is gradually reduced. S3. When the aeration tank is under maintenance, close the gate valve to disconnect the gas supply between the odor treatment pipeline and the air inlet pipeline of the aeration tank, and discharge all exhaust gas through the exhaust chimney.

2. The method for saving the amount of inorganic carbon source added to an aeration tank according to claim 1, characterized in that, The aforementioned aeration blower supplies odor-treated exhaust gas and air to the aeration tank.

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

4. The method for saving the amount of inorganic carbon source added to an aeration tank according to claim 1, characterized in that, The aforementioned inlet valve controls the amount of air entering the air inlet pipe of the aeration tank.

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