A sewage blower energy saving system and method of operation

Abstract

The application discloses a sewage blower energy-saving system and an operating method. The energy-saving system comprises a biochemical tank and a blower, an air outlet of the blower is communicated with the bottom of the biochemical tank, further comprises a gas storage pool, an aeration device is installed at the bottom of the gas storage pool, an air inlet of the aeration device is communicated with another air outlet of the blower through an aeration pipeline, a liquid inlet of the gas storage pool is communicated with a liquid outlet of the biochemical tank through a water inlet pipeline, and a liquid outlet of the gas storage pool is communicated with a liquid inlet of the biochemical tank through a water outlet pipeline. The application stores the oxygen-rich water solution prepared by the residual air volume of the blower into the gas storage pool, and then introduces the oxygen-rich water solution into the biochemical tank for oxygen supply, so that the total air supply demand of the blower is effectively reduced, and the energy consumption of the blower is reduced.

Description

Technical Field

[0001] This invention relates to the field of blowers, and in particular to an energy-saving system and operating method for a sewage blower. Background Technology

[0002] Aeration is an important technology in wastewater treatment. Its purpose is to force air into the wastewater, ensuring sufficient contact between the wastewater and air, thereby increasing the dissolved oxygen content and accelerating the oxidation and decomposition of organic matter, suspended solids, and pollutants in the wastewater. Aeration technology can be widely applied to various types of wastewater treatment processes, such as biological oxidation ponds and activated sludge ponds.

[0003] Chinese Patent Publication No. CN109354156B discloses an aeration system for a biochemical wastewater treatment pond, including a biochemical aeration tank, a stirring device installed at the bottom of the biochemical aeration tank, and several aerator assemblies symmetrically arranged on the inner wall of the biochemical aeration tank, a blower unit connected to the aerator assemblies through a pipeline system, the blower unit including at least one set of blowers, the blowers being connected to the aerator assemblies through an electric two-way valve connecting pipe A, several evenly arranged aerators installed on the aeration pre-pressure pipe, several dissolved oxygen meters installed on the aeration pre-pressure pipe, and a host computer connected to the stirring device, the blower device, and the dissolved oxygen meters respectively.

[0004] There are many different ways to implement aeration technology. One common method is blower aeration, which uses a blower to deliver air through pipes to the aeration tank, ensuring sufficient contact between the wastewater and the air. Blowers are key equipment in wastewater treatment plants, accounting for more than half of the total energy consumption of the water treatment system. Therefore, energy conservation in blowers is of great importance.

[0005] When the influent volume of a wastewater treatment plant is low or the water quality is good, the minimum airflow of the blower may still exceed the aeration capacity required for the wastewater. This will result in over-aeration, causing unnecessary energy waste and affecting the effluent quality. Some wastewater treatment plants have adopted an intermittent aeration mode to address this situation, but once aeration stops, an anoxic state will occur, leading to decreased microbial activity, insufficient aeration time, and incomplete nitrification. Some wastewater treatment plants have added venting devices at the end of the aeration process to reduce the impact of over-aeration, but this does not solve the problem of energy waste.

[0006] Furthermore, the long-term operation of blowers is accompanied by equipment failures and increased maintenance costs. This system effectively reduces the gas supply demand of the blower in the biochemical reaction zone through an innovative gas saturation method, thereby achieving the goal of energy conservation and emission reduction. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an energy-saving system and operating method for sewage blowers, which addresses the shortcomings of existing technologies, and reduces the energy consumption of the blowers while ensuring the quality of the effluent.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] An energy-saving sewage blower system includes a biological treatment tank and a blower. The air outlet of the blower is connected to the bottom of the biological treatment tank. The system also includes an air storage tank. An aeration device is installed at the bottom of the air storage tank. The air inlet of the aeration device is connected to another air outlet of the blower through an aeration pipe. The liquid inlet of the air storage tank is connected to the liquid outlet of the biological treatment tank through a water inlet pipe. The liquid outlet of the air storage tank is connected to the liquid inlet of the biological treatment tank through a water outlet pipe.

[0010] Preferably, the wastewater blower energy-saving system includes a controller, which controls the connection or disconnection of the inlet pipe, the aeration pipe and the outlet pipe respectively.

[0011] This invention prepares high-concentration oxygenated water by bypassing the blower air supply. The solution containing a large amount of dissolved gas is directly introduced into the biochemical reaction zone, while the blower is stopped, thereby reducing the amount of air supplied by the blower. This ensures the quality of the effluent while reducing its operating energy consumption.

[0012] In a preferred embodiment of the present invention, the aeration device includes multiple branch pipes, and aeration discs are installed on the branch pipes.

[0013] In a preferred embodiment of the present invention, a first valve is installed on the aeration pipe.

[0014] In a preferred embodiment of the present invention, an inlet valve is installed on the inlet pipe.

[0015] In a preferred embodiment of the present invention, a water outlet valve is installed on the water outlet pipe;

[0016] Preferably, the controller is connected to the inlet valve, the first valve, and the outlet valve respectively, and controls the opening or closing of the inlet valve, the first valve, and the outlet valve respectively.

[0017] The present invention also discloses an operating method for the aforementioned wastewater blower energy-saving system, comprising the following steps:

[0018] S1. When the aeration required by the biological treatment tank exceeds the minimum air supply of the blower, a portion of the sewage from the biological treatment tank is diverted to the air storage tank through the water inlet pipe.

[0019] S2. Connect the air inlet of the aeration device to the other air outlet of the blower, deduct the excess air volume of the blower from the air volume required for the aeration of the biological tank, and aerate the water in the gas storage tank through the aeration device to increase the dissolved oxygen in the gas storage tank.

[0020] S3. When the water level in the gas storage tank reaches its maximum, the wastewater from the biochemical tank will stop being diverted to the gas storage tank.

[0021] S4. When the dissolved oxygen in the gas storage tank is close to saturation, turn off the blower and introduce the oxygen-enriched water in the gas storage tank into the biochemical tank through the outlet pipe to supply oxygen.

[0022] In a preferred embodiment of the present invention, in S1, by closing the outlet valve of the gas storage tank and opening the inlet valve of the gas storage tank, a portion of the sewage from the biochemical tank is diverted to the gas storage tank.

[0023] In a preferred embodiment of the present invention, in S2, the air inlet of the aeration device is connected to the other air outlet of the blower by opening the first valve on the aeration pipe.

[0024] In a preferred embodiment of the present invention, in S3, by closing the inlet valve of the gas storage tank, the sewage from the biochemical tank is temporarily diverted to the gas storage tank.

[0025] In a preferred embodiment of the present invention, in S4, the oxygen-rich water in the gas storage tank is introduced into the aerobic zone of the biochemical tank through the outlet pipe by opening the outlet valve of the gas storage tank to supply oxygen.

[0026] In S1, the dissolved oxygen concentration range of the biological treatment tank is set to a~b. When the blower's air supply is reduced to the minimum, if the dissolved oxygen concentration in the aerobic zone of the biological treatment tank still exceeds b, it is determined that the aeration required for the biological treatment tank of the sewage treatment plant exceeds the minimum air supply of the blower.

[0027] In S2, adjust the opening of the first valve until the dissolved oxygen concentration in the biological tank stabilizes to the target range, thus reducing the excess air volume of the blower by the amount of aeration required by the biological tank.

[0028] In S4, the dissolved oxygen in the gas storage tank is close to saturation when the dissolved oxygen in the gas storage tank is close to the dissolved oxygen saturation value under the water temperature condition.

[0029] In S4, once the water in the gas storage tank is completely used up, the blower is turned on to supply air to the biological treatment tank. When the aeration required by the biological treatment tank exceeds the minimum air supply of the blower, a new round of water intake and gas storage operations for the gas storage tank can be started.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1) Significantly reduce energy consumption: The remaining air volume of the blower is used to prepare an oxygen-enriched aqueous solution, which is stored in the gas storage tank and then introduced into the biochemical tank for oxygen supply. This effectively reduces the total gas supply demand of the blower, thereby reducing the energy consumption of the blower.

[0032] 2) Improve biochemical reaction efficiency: The high concentration of gas in oxygen-enriched aqueous solutions can quickly replenish the oxygen required for biochemical reactions, thereby improving reaction speed and efficiency.

[0033] 3) Enhanced system flexibility: The system can adapt to changes in water quality and influent volume, improving operational stability and reliability. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0035] Figure 2 This is a diagram showing the dissolved oxygen content of a wastewater blower energy-saving system in one embodiment of the present invention.

[0036] Among them, 1 is the oxygen-enriched water preparation system: 1-1 is the air storage tank, 1-2 is the aeration pipe, 1-3 is the aeration disc, 1-4 is the first valve, and 1-5 is the branch pipe;

[0037] 2 is the oxygen-enriched water delivery system: 2-1 is the inlet pipe, 2-2 is the inlet valve, 2-3 is the outlet pipe, and 2-4 is the outlet valve. Detailed Implementation

[0038] like Figure 1 As shown, an energy-saving system for a sewage blower includes an oxygen-enriched water preparation system 1 and an oxygen-enriched water delivery system 2.

[0039] The oxygen-enriched water preparation system 1 consists of an air storage tank 1-1, an aeration pipe 1-2, and an aeration disc 1-3. In this embodiment, the air storage tank 1-1 is located near the biological treatment tank. The aeration disc 1-3 is located at the bottom of the biological treatment tank, and is connected to the aeration pipe 1-2 and the water plant blower. An adjustable first valve 1-4 is installed on the aeration pipe 1-2.

[0040] The oxygen-enriched water supply system 2 includes an inlet pipe 2-1 for the gas storage tank 1-1, an inlet valve 2-2, an outlet pipe 2-3, and an outlet valve 2-4. In this embodiment, the inlet pipe 2-1 is connected to a branch pipe of the inlet pipe of the biological treatment tank. The outlet pipe 2-3 is connected to the aerobic zone of the biological treatment tank. The inlet pipe 2-1 and the outlet pipe 2-3 are respectively equipped with inlet valve 2-2 and outlet valve 2-4.

[0041] With the goal of controlling the dissolved oxygen concentration in biological treatment tank 1-1 to be between 1.5 mg / L and 2 mg / L, if the dissolved oxygen concentration in the aerobic zone of the biological treatment tank still exceeds 2 mg / L even when the blower's air supply is reduced to its minimum, it is determined that the aeration required for the biological treatment tank exceeds the blower's minimum air supply. At this point, the outlet valve 2-4 of the air storage tank 1-1 is closed, and the inlet valve 2-2 of the air storage tank 1-1 is opened, allowing a portion of the wastewater from the biological treatment tank to be diverted to the air storage tank 1-1. The opening of the first valve 1-4 on the aeration pipe is adjusted until the dissolved oxygen concentration in the biological treatment tank stabilizes within the target range. This means that the excess air volume from the blower (after deducting the aeration required by the biological treatment tank) is aerated through the aeration disc 1-3 and used to increase the dissolved oxygen in the air storage tank 1-1. Once the water level in gas storage tank 1-1 reaches its maximum, close the inlet valve 2-2. Measure the water temperature and dissolved oxygen concentration in gas storage tank 1-1. When the dissolved oxygen in gas storage tank 1-1 approaches the dissolved oxygen saturation value under those water temperature conditions, turn off the blower and simultaneously open the outlet valve 2-4 of gas storage tank 1-1 to introduce oxygen-enriched water from gas storage tank 1-1 into the aerobic zone of the biological treatment tank for oxygen supply. When all the water in the gas storage tank is used up, turn on the blower to supply air to the biological treatment tank. When the aeration required by the biological treatment tank exceeds the minimum air supply capacity of the blower, a new round of water intake and gas storage operations can be initiated.

[0042] By adopting the above technical solution, the remaining air volume of the blower is used to prepare an oxygen-enriched aqueous solution, which is then stored in an air storage tank and subsequently introduced into a biochemical tank for oxygen supply. This effectively reduces the total air supply demand of the blower, thereby reducing its energy consumption. In this example, the blower's electricity consumption per thousand tons of water is reduced by approximately 10% compared to historical data for the same period. Figure 2 As shown, the high concentration of gas in the oxygen-enriched aqueous solution can quickly replenish the oxygen required for the biochemical reaction, improve the reaction rate and efficiency, and maintain the dissolved oxygen in the biochemical tank at a stable level of 1.5–2 mg / L, thereby improving the stability and reliability of operation.

Claims

1. An operating method for an energy-saving system for a sewage blower, characterized in that... Includes the following steps: S1. When the required aeration volume of the biological treatment tank (3) is lower than the minimum air supply volume of the blower (4), a portion of the sewage from the biological treatment tank (3) is diverted to the gas storage tank (1-1) through the water inlet pipe (2-1). S2. Connect the air inlet of the aeration device to the other air outlet of the blower (4), deduct the excess air volume of the blower (4) from the air volume of the biological tank (3) and aerate the water in the gas storage tank (1-1) through the aeration device to increase the dissolved oxygen in the water in the gas storage tank (1-1). S3. When the water level in the gas storage tank (1-1) reaches the highest level, the sewage from the biochemical tank (3) is temporarily diverted to the gas storage tank (1-1). S4. When the dissolved oxygen in the gas storage tank (1-1) is close to saturation, turn off the blower (4) and introduce the oxygen-rich water in the gas storage tank (1-1) into the biochemical tank (3) through the outlet pipe (2-3) to supply oxygen. The wastewater blower energy-saving system includes a biological treatment tank (3) and a blower (4). The air outlet of the blower (4) is connected to the bottom of the biological treatment tank (3). The system is characterized by further including a gas storage tank (1-1). An aeration device is installed at the bottom of the gas storage tank (1-1). The air inlet of the aeration device is connected to another air outlet of the blower (4) through an aeration pipe (1-2). The liquid inlet of the gas storage tank (1-1) is connected to the liquid outlet of the biological treatment tank (3) through a water inlet pipe (2-1). The liquid outlet of the gas storage tank (1-1) is connected to the liquid inlet of the biological treatment tank (3) through a water outlet pipe (2-3).

2. The operation method of the wastewater blower energy-saving system according to claim 1, characterized in that, In S1, by closing the outlet valve (2-4) of the gas storage tank (1-1) and opening the inlet valve (2-2) of the gas storage tank (1-1), a portion of the sewage from the biochemical tank (3) is diverted to the gas storage tank (1-1).

3. The operation method of the wastewater blower energy-saving system according to claim 1, characterized in that, In S2, the air inlet of the aeration device is connected to the other air outlet of the blower (4) by opening the first valve (1-4) on the aeration pipe (1-2).

4. The operation method of the wastewater blower energy-saving system according to claim 1, characterized in that, In S3, by closing the inlet valve (2-2) of the gas storage tank (1-1), the sewage from the biochemical tank (3) is temporarily diverted to the gas storage tank (1-1).

5. The operation method of the wastewater blower energy-saving system according to claim 1, characterized in that, In S4, by opening the outlet valve (2-4) of the gas storage tank (1-1), the oxygen-rich water in the gas storage tank (1-1) is introduced into the aerobic zone of the biochemical tank (3) through the outlet pipe (2-3) to supply oxygen.

6. The operating method of the wastewater blower energy-saving system according to claim 1, characterized in that, The wastewater blower energy-saving system includes a controller, which controls the connection or disconnection of the inlet pipe, aeration pipe and outlet pipe respectively.

7. The operating method of the wastewater blower energy-saving system according to claim 1, characterized in that, The aeration device includes multiple branch pipes (1-5), and an aeration disc (1-3) is installed on each branch pipe (1-5).

8. The operation method of the wastewater blower energy-saving system according to claim 6, characterized in that, The aeration pipe (1-2) is equipped with a first valve (1-4).

9. The operation method of the wastewater blower energy-saving system according to claim 8, characterized in that, An inlet valve (2-2) is installed on the inlet pipe (2-1).

10. The operation method of the wastewater blower energy-saving system according to claim 9, characterized in that, A water outlet valve (2-4) is installed on the water outlet pipe (2-3).

11. The operation method of the wastewater blower energy-saving system according to claim 10, characterized in that, The controller is connected to the inlet valve, the first valve, and the outlet valve respectively, and controls the opening or closing of the inlet valve, the first valve, and the outlet valve respectively.

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