A gas management system and method for an underground sewage plant

Abstract

The present invention provides a gas management system and method for an underground sewage treatment plant, including: a fresh air shaft, which transports external air to the gas flow area through a fresh air fan; an exhaust air shaft, which discharges the gas in the gas flow area through an exhaust fan; a biological pool, which receives gas through an aeration blower and performs aeration treatment; and a deodorization emission tower, which uses a deodorization fan to deodorize the gas before discharging it. The system also includes an aeration shaft, a gas detection device and a control device, which are used to detect harmful gas information and regulate each fan and deodorization emission tower according to preset thresholds and weights. The present invention can realize the integrated and intelligent operation of the air management system of an underground sewage treatment plant, thereby improving energy efficiency and reducing operating costs, and has broad application value in the fields of sewage treatment, environmental protection and urban infrastructure management.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a gas management system and method for an underground sewage plant. Background Art

[0002] Sewage treatment is an important part of urban infrastructure. Its main task is to treat urban domestic sewage and industrial wastewater to meet the discharge standard or reuse standard, thereby protecting the water environment and ecological balance. With the acceleration of urbanization and the improvement of environmental protection requirements, the construction and operation scale of sewage treatment plants has continued to expand. In particular, underground sewage treatment plants have gradually become an important sewage treatment method due to their advantages such as small footprint and small impact on the surrounding environment.

[0003] However, existing underground sewage treatment plants have many problems in gas management. First, the existing gas management system mainly relies on mechanical ventilation and deodorization equipment, which have high energy consumption, about 4-6 times that of ground sewage treatment plants, resulting in high operating costs. In particular, the ventilation system, deodorization system and aeration system operate independently, lacking effective coordination and integration, resulting in duplicate construction and waste of resources.

[0004] In summary, the prior art lacks a system and method for integrated and automated management of gas in underground sewage treatment plants. Summary of the invention

[0005] The present invention aims to provide a gas management system and method for an underground sewage treatment plant, which can solve the problem in the related art that the ventilation system, deodorization system and aeration system operate independently and lack effective coordination and integration.

[0006] According to one aspect of the present invention, there is provided a gas management system applied to an underground sewage treatment plant, the underground sewage treatment plant includes a gas flow area, and the gas management system includes: a fresh air shaft, the bottom of which is located at the bottom of the gas flow area and the top protrudes above the ground, the top of the fresh air shaft is provided with air inlet louvers, the fresh air shaft is used to transport the air outside the underground sewage treatment plant to the gas flow area through a fresh air fan; an exhaust air shaft, the bottom of which is connected to the gas flow area and the top protrudes above the ground, the top of the exhaust air shaft is provided with air outlet louvers, the exhaust air shaft is used to discharge the gas in the gas flow area through the exhaust fan; a biological pool, located in the underground sewage treatment plant and outside the gas flow area, for receiving the gas from the gas flow area or the air outside the underground sewage treatment plant through an aeration blower, and performing aeration treatment; a deodorization emission tower, the bottom of which is connected to the gas flow area and the top protrudes above the ground, for using a deodorization fan to deodorize the gas in the gas flow area and then discharge it.

[0007] Preferably, the system also includes: an aeration shaft, the bottom of which is located on one side of the aeration blower and the top protrudes above the ground, the top of the aeration shaft is provided with a first electric shutter, and the aeration shaft is used to transport air outside the underground sewage treatment plant to the biological pond through the aeration blower.

[0008] Preferably, the system also includes: a gas detection device, located in the gas flow area, for detecting gas information, the gas information including the concentration of NH3, H2S, CH4, CO, CO2, and O2; a control device, for regulating the fresh air fan, the exhaust fan, the aeration blower and the deodorization emission tower according to the gas information and pre-set thresholds and weights.

[0009] Preferably, the control device calculates the comprehensive air quality index CAQI according to the following formula:

[0010] Among them C i is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas, n is the total number of harmful gases that need to be detected; when the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower, the first electric fan blade and the exhaust fan are all turned on, and the second electric fan blade located at the lower part of the aeration air shaft near the gas circulation area and the third electric fan blade located at the lower part of the fresh air air shaft near the gas circulation area are both closed.

[0011] Preferably, when the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower and the exhaust fan are all turned off, and the second electric fan blade and the third electric fan blade are both turned on.

[0012] Preferably, when the deodorizing emission tower is turned on, the relationship between the power P of the deodorizing emission tower and the comprehensive air quality index CAQI satisfies:

[0013]

[0014] Among them, P min is the minimum power of the deodorization emission tower, P max is the maximum power of the deodorizing tower, α is the preset adjustment coefficient, and e is a mathematical constant; the operating speed S of the deodorizing fan odor The power P of the deodorization emission tower satisfies:

[0015]

[0016] Among them, K odor is the gas treatment efficiency coefficient of the deodorization emission tower, the formula is: K odor =β×log(γ×CAQI+δ);

[0017] Among them, β, γ, and δ are adjustment coefficients related to the performance of the deodorization emission tower.

[0018] Preferably, when the exhaust fan is turned on, the operating speed S of the exhaust fan is exhaust The relationship with the comprehensive air quality index CAQI satisfies:

[0019]

[0020] Among them, S min_exhaust is the minimum speed of the exhaust fan, S max_exhaust is the maximum speed of the exhaust fan, ζ is the preset adjustment coefficient; the operating speed S of the fresh air fan flow Satisfaction: S flow =S exhaust +S odor +S aeration

[0021] Among them, S aeration is the extraction rate of the aeration blower, which refers to the rate at which the biological pond extracts gas from the gas circulation area.

[0022] Preferably, when the aeration blower is turned on, the operating speed S of the aeration blower is aeration_fan satisfy:

[0023]

[0024] Where k is a constant, C BOD is the biochemical oxygen demand in the sewage in the biochemical pool, C BOD_std is the standard biochemical oxygen demand, V sewage is the volume of sewage in the biochemical pool; when the operating speed of the aeration blower is S aeration_fan Less than or equal to the air flow rate S of the first electric fan blade first_damper When the electric valve from the gas flow area to the biological pool is closed, the extraction rate S of the aeration blower is aeration is zero; when the operating speed of the aeration blower S aeration_fan Greater than the air flow rate S of the first electric fan blade first_damper When the electric valve is opened, the extraction rate S of the aeration blower is aeration satisfy:

[0025] S aeration =Saeration_fan -S first_damper

[0026] According to another aspect of the present invention, there is provided a gas management method for an underground sewage treatment plant, comprising: conveying the air outside the underground sewage treatment plant to the gas flow area through a fresh air fan; conveying the gas in the gas flow area to a deodorizing emission tower by a deodorizing fan for deodorization and discharge; receiving the gas from the gas flow area or the air outside the underground sewage treatment plant through an aeration blower and performing aeration treatment; discharging the gas in the gas flow area through an exhaust fan; detecting gas information, the gas information including the concentrations of NH3, H2S, CH4, CO, CO2 and O2; and regulating the fresh air fan, the exhaust fan, the aeration blower and the deodorizing emission tower according to the gas information and pre-set thresholds and weights.

[0027] Preferably, regulating the fresh air fan, the exhaust fan, the aeration blower and the deodorization emission tower according to the gas information and the preset thresholds and weights includes: calculating a comprehensive air quality index CAQI:

[0028]

[0029] Among them C i is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas; when the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI, the deodorizing tower, the fresh air fan, the deodorizing fan, the aeration blower and the exhaust fan are turned on; when the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the deodorization tower, the fresh air fan, the deodorization fan, the aeration blower and the exhaust fan are turned off.

[0030] The present invention provides a gas management system and method for an underground sewage treatment plant, including: a fresh air shaft, which transports external air to the gas flow area through a fresh air fan; an exhaust air shaft, which discharges the gas in the gas flow area through an exhaust fan; a biological pool, which receives gas through an aeration blower and performs aeration treatment; and a deodorization emission tower, which uses a deodorization fan to deodorize the gas before discharging it. The system also includes an aeration shaft, a gas detection device and a control device, which are used to detect harmful gas information and regulate each fan and deodorization emission tower according to preset thresholds and weights. The present invention can realize the integrated and intelligent operation of the air management system of an underground sewage treatment plant, thereby improving energy efficiency and reducing operating costs. It has wide application value in the fields of sewage treatment, environmental protection and urban infrastructure management. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 Schematic diagram of a gas management system for an underground sewage plant in a pre-treatment area according to an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a gas management system for an underground sewage plant in a secondary treatment area according to an embodiment of the present invention; and

[0034] Figure 3 The present invention is a flow chart of a method for managing gas in an underground sewage treatment plant according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0037] The embodiment of the present invention provides a gas management system for an underground sewage plant, such as Figure 1 , Figure 2 As shown, the underground sewage treatment plant includes a gas flow area, and the gas management system includes: a fresh air shaft, the bottom of which is located at the bottom of the gas flow area, the top of which protrudes above the ground, and the top of the fresh air shaft is provided with air inlet louvers, and the fresh air shaft is used to transport the air outside the underground sewage treatment plant to the gas flow area through a fresh air fan; an exhaust air shaft, the bottom of which is connected to the gas flow area, the top of which protrudes above the ground, and the top of the exhaust air shaft is provided with air outlet louvers, and the exhaust air shaft is used to discharge the gas in the gas flow area through the exhaust fan; a biological pool, located in the underground sewage treatment plant and outside the gas flow area, for receiving the gas from the gas flow area or the air outside the underground sewage treatment plant through an aeration blower, and performing aeration treatment; a deodorization emission tower, the bottom of which is connected to the gas flow area, the top of which protrudes above the ground, and is used to use a deodorization fan to deodorize the gas in the gas flow area and then discharge it.

[0038] In the related art, the ventilation and deodorization systems of underground sewage treatment plants usually operate independently, lacking effective coordination and integration, and the biological aeration system is not incorporated into the overall system, resulting in high energy consumption and high operating costs. The embodiment of the present invention significantly improves the efficiency and effectiveness of gas management by integrating the air intake shaft, exhaust shaft, biological pool and deodorization emission tower into one system. The air intake shaft and the exhaust shaft work in coordination to ensure the continuity of gas flow; the biological pool helps sewage treatment through aeration treatment, and can also improve air quality and biodegrade harmful components in the gas; the deodorization emission tower further purifies the gas to ensure that the exhaust gas meets environmental protection standards. By integrating the biochemical pool into the system, the biological aeration function is effectively utilized to improve the overall gas treatment effect.

[0039] According to an embodiment of the present invention, the system also includes: an aeration shaft, the bottom of which is located on one side of the aeration blower and the top protrudes above the ground, and a first electric shutter is provided on the top of the aeration shaft. The aeration shaft is used to transport the air outside the underground sewage treatment plant to the biological pond through the aeration blower.

[0040] In the related art, the aeration system of underground sewage treatment plants is often separated from other gas management systems, which cannot fully utilize external air resources and has low aeration efficiency. The embodiment of the present invention provides an aeration air shaft and a first electric shutter, so that the aeration blower can introduce fresh air from the outside, thereby improving the aeration efficiency and treatment effect of the biological pool. By integrating the aeration air shaft, the system can flexibly adjust the gas flow and optimize the aeration process, thereby improving the sewage treatment efficiency.

[0041] According to an embodiment of the present invention, the system also includes: a gas detection device, located in the gas flow area, for detecting gas information, the gas information including the concentration of NH3, H2S, CH4, CO, CO2, and O2; a control device, for regulating the fresh air fan, the exhaust fan, the aeration blower, and the deodorization emission tower according to the gas information and pre-set thresholds and weights.

[0042] The embodiment of the present invention uses a gas detection device and a control device to monitor the concentration of harmful gases in the gas flow area in real time, and calculates a comprehensive air quality index according to a preset threshold and weight. The control device dynamically adjusts the operating status of each fan and deodorization emission tower according to the comprehensive air quality index, realizes intelligent gas management, and improves the response speed and control accuracy of the system.

[0043] According to an embodiment of the present invention, the control device calculates the comprehensive air quality index CAQI according to the following formula:

[0044]

[0045] Among them Ci is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas, n is the total number of harmful gases that need to be detected; when the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower, the first electric fan blade and the exhaust fan are all turned on, and the second electric fan blade located at the lower part of the aeration air shaft near the gas circulation area and the third electric fan blade located at the lower part of the fresh air air shaft near the gas circulation area are both closed.

[0046] The embodiment of the present invention provides a quantitative evaluation standard by setting a comprehensive air quality index to effectively integrate the concentration information of multiple gases. According to the comprehensive air quality index, the system can flexibly adjust the operating status of each device to ensure rapid response in high pollution conditions and improve gas treatment effects; save energy and reduce operating costs in low pollution conditions.

[0047] According to an embodiment of the present invention, when the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower and the exhaust fan are all turned off, and the second electric fan blade and the third electric fan blade are both turned on.

[0048] In the related art, it is difficult for gas management systems to effectively save energy under low pollution conditions. They usually rely on fixed operation strategies, which wastes energy and increases operating costs. They cannot be flexibly adjusted according to changes in actual air quality. In the embodiment of the present invention, when the comprehensive air quality index is lower than or equal to the preset low threshold, the system will automatically shut down high-energy consumption devices and turn on low-energy consumption devices, thereby significantly reducing the operating energy consumption of the system and improving energy efficiency while ensuring air quality.

[0049] According to an embodiment of the present invention, when the deodorizing emission tower is turned on, the relationship between the power P of the deodorizing emission tower and the comprehensive air quality index CAQI satisfies:

[0050]

[0051] Among them, P min is the minimum power of the deodorization emission tower, P max is the maximum power of the deodorizing tower, α is the preset adjustment coefficient, and e is a mathematical constant; the operating speed S of the deodorizing fan odor The power P of the deodorization emission tower satisfies:

[0052]

[0053] Among them, K odor is the gas treatment efficiency coefficient of the deodorization emission tower, and the formula is:

[0054] K odor =β×log(γ×CAQI+δ);

[0055] Among them, β, γ, and δ are adjustment coefficients related to the performance of the deodorization emission tower.

[0056] The embodiment of the present invention realizes dynamic adjustment of the deodorization emission tower power and the deodorization fan operating speed through the above formula, so that the system can efficiently cope with different pollution levels, improve the performance of the deodorization system, and reduce the operating cost.

[0057] According to an embodiment of the present invention, when the exhaust fan is turned on, the operating speed S of the exhaust fan is exhaust The relationship with the comprehensive air quality index CAQI satisfies:

[0058]

[0059] Among them, S min_exhaust is the minimum speed of the exhaust fan, S max_exhaust is the maximum speed of the exhaust fan, ζ is the preset adjustment coefficient; the operating speed S of the fresh air fan flow Satisfaction: S flow =S exhaust +S odor +S aeration

[0060] Among them, S aeration is the extraction rate of the aeration blower, which refers to the rate at which the biological pond extracts gas from the gas circulation area.

[0061] The embodiment of the present invention realizes intelligent control of the exhaust fan and the air inlet fan through the above formula, and can dynamically adjust the operating speed according to the comprehensive air quality index, thereby improving the ventilation efficiency and energy efficiency of the system. The operating speed of the exhaust fan is adjusted as the comprehensive air quality index changes, ensuring that more gas is discharged when the pollution is serious and saving energy when the pollution is light. The operating speed of the air inlet fan combines the speeds of the deodorizing fan, the exhaust fan and the aeration blower, ensuring the continuity and balance of the gas flow.

[0062] According to an embodiment of the present invention, when the aeration blower is turned on, the operating speed S of the aeration blower is aeration_fan satisfy:

[0063]

[0064] Where k is a constant, C BODis the biochemical oxygen demand in the sewage in the biochemical pool, C BOD_std is the standard biochemical oxygen demand, V sewage is the volume of sewage in the biochemical pool; when the operating speed of the aeration blower is S aeration_fan Less than or equal to the air flow rate S of the first electric fan blade first_damper When the electric valve from the gas flow area to the biological pool is closed, the extraction rate S of the aeration blower is aeration is zero; when the operating speed of the aeration blower S aeration_fan Greater than the air flow rate S of the first electric fan blade first_damper When the electric valve is opened, the extraction rate S of the aeration blower is aeration satisfy:

[0065] S aeration =S aeration_fan -S first_damper

[0066] The embodiment of the present invention realizes intelligent control of the exhaust fan and the air inlet fan through the above formula, and can dynamically adjust the operating speed, thereby improving the ventilation efficiency and energy efficiency of the system, and effectively improving the air quality of the underground sewage treatment plant.

[0067] According to another embodiment of the present invention, a gas management method for underground sewage treatment plants is provided. Figure 3 As shown, it includes: conveying the air outside the underground sewage treatment plant to the gas flow area through a fresh air fan; conveying the gas in the gas flow area to a deodorization emission tower for deodorization and then discharge by a deodorization fan; receiving the gas from the gas flow area or the air outside the underground sewage treatment plant through an aeration blower and performing aeration treatment; discharging the gas in the gas flow area through an exhaust fan; detecting gas information, the gas information including the concentration of NH3, H2S, CH4, CO, CO2, and O2; and regulating the fresh air fan, the exhaust fan, the aeration blower, and the deodorization emission tower according to the gas information and pre-set thresholds and weights.

[0068] In the related art, the ventilation and deodorization systems of underground sewage treatment plants usually operate independently, lacking effective coordination and integration, and the biological aeration system is not incorporated into the overall system, resulting in high energy consumption and high operating costs. The embodiment of the present invention significantly improves the efficiency and effectiveness of gas management by integrating the air intake shaft, exhaust shaft, biological pool and deodorization emission tower into one system. The air intake shaft and the exhaust shaft work in coordination to ensure the continuity of gas flow; the biological pool helps sewage treatment through aeration treatment, and can also improve air quality and biodegrade harmful components in the gas; the deodorization emission tower further purifies the gas to ensure that the exhaust gas meets environmental protection standards. By integrating the biochemical pool into the system, the biological aeration function is effectively utilized to improve the overall gas treatment effect.

[0069] According to an embodiment of the present invention, regulating the fresh air fan, the exhaust fan, the aeration blower and the deodorization emission tower according to the gas information and the preset thresholds and weights includes: calculating the comprehensive air quality index CAQI:

[0070]

[0071] Among them C i is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas; when the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI, the deodorizing tower, the fresh air fan, the deodorizing fan, the aeration blower and the exhaust fan are turned on; when the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the deodorization tower, the fresh air fan, the deodorization fan, the aeration blower and the exhaust fan are turned off.

[0072] In the related art, it is difficult for gas management methods to achieve comprehensive evaluation and dynamic regulation of multiple gases, and usually only one or several gases are monitored and processed. The embodiments of the present invention can effectively integrate the information of multiple harmful gases and provide quantitative evaluation standards.

[0073] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0074] Figure 1 A schematic diagram of a gas management system for an underground sewage plant in a pre-treatment area according to an embodiment of the present invention is shown, including:

[0075] The pre-treatment system ventilation system includes a fresh air system and an exhaust system. The fresh air system consists of a fresh air shaft, air inlet louvers, electric louvers 3, a pre-treatment fresh air shaft and supporting piping systems; the exhaust system consists of an exhaust shaft, air outlet louvers, a pre-treatment exhaust fan and supporting piping systems.

[0076] The pretreatment deodorization system is composed of pretreatment deodorization equipment, a deodorization fan, a deodorization emission tower, an electric valve 1, an electric valve 2 and a supporting piping system.

[0077] The biological pond aeration system is composed of an air inlet fan, electric shutter 1, electric shutter 2, an aeration fan and a supporting piping system.

[0078] Working condition 1: Normal underground sewage treatment plant operation mode, electric shutter 2, electric shutter 3, and electric valve 2 are closed, and the other valves and shutters are open normally. At this time, all fans and deodorization systems are turned on, and the energy consumption is the highest.

[0079] Working condition 2: Energy-saving mode, electric shutter 1, electric valve 1, air supply fan, exhaust fan, and deodorization system are closed, and electric shutter 2, electric shutter 3, and electric valve 2 are opened. At this time, the ventilation system and deodorization system are all shut down, and the aeration system directly takes air from the underground space, and at the same time connects the slightly polluted odorous gas in the pretreatment space and sends it all to the biological pool for aeration, which greatly reduces the energy consumption of the system operation.

[0080] When the amount of micro-polluted odorous gas is less than the minimum amount of gas required by the aeration system, the micro-polluted deodorization system of the pretreatment system can be cancelled to further reduce investment costs.

[0081] Figure 2 A schematic diagram of a gas management system for an underground sewage plant in a secondary treatment area according to an embodiment of the present invention is shown, including:

[0082] The secondary treatment system ventilation system includes a fresh air system and an exhaust system. The fresh air system consists of a fresh air shaft, air inlet louvers, electric louvers, a secondary treatment fresh air shaft and supporting piping systems; the exhaust system consists of an exhaust shaft, air outlet louvers, a secondary treatment exhaust fan and supporting piping systems.

[0083] The secondary treatment deodorization system consists of secondary treatment deodorization equipment, deodorization blower, deodorization emission tower and supporting piping system.

[0084] The biological pond aeration system is composed of an air inlet fan, electric shutter 1, electric shutter 2, an aeration fan and a supporting piping system.

[0085] Working condition 1: Conventional underground sewage treatment plant operation mode, electric shutters 2 and 3 are closed, and the remaining electric shutter 1 is open. At this time, all fans and deodorization systems are turned on, and the energy consumption is the highest.

[0086] Working condition 2: Energy-saving mode, electric shutter 1, air supply fan, and exhaust fan are turned off, and electric shutter 2 and electric shutter 3 are turned on. At this time, the ventilation system is completely shut down, and the aeration system directly takes air from the underground space and sends it all to the biological pool for aeration, which greatly reduces the energy consumption of the system operation.

[0087] When the online monitoring instrument detects an abnormality, the ventilation system can be turned on to ensure the safe operation of the underground space.

[0088] In summary, the present invention has the following advantages:

[0089] (1) The present invention realizes efficient coordination of gas management in underground sewage treatment plants by integrating the air intake shaft, exhaust shaft, biological pool and deodorization emission tower into one system. The air intake shaft and exhaust shaft work in coordination to ensure the continuity of gas flow. The biological pool not only improves the sewage treatment effect through aeration treatment, but also improves the air quality, thereby greatly improving the overall operating efficiency of the system.

[0090] (2) The gas management system of the present invention adopts a comprehensive air quality index calculation and dynamic control mechanism, which can automatically adjust the operating status of each fan and deodorization emission tower according to the real-time monitored gas concentration information. In high-pollution conditions, the system responds quickly and improves processing capacity; in low-pollution conditions, the system enters power-saving mode, significantly reducing energy consumption and operating costs, achieving energy-saving and environmental protection effects.

[0091] (3) The system provided by the present invention integrates a gas detection device and a control device to achieve comprehensive evaluation and management of multiple harmful gases. By dynamically adjusting the operating status of the air intake, exhaust, aeration and deodorization devices, the efficiency and stability of the gas treatment process are ensured.

[0092] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A gas management device for an underground sewage treatment plant, wherein the underground sewage treatment plant comprises a gas flow area, characterized in that: The gas management device comprises: A fresh air shaft, the bottom of which is located at the bottom of the gas flow area, the top of which protrudes above the ground, the top of which is provided with air inlet louvers, and the fresh air shaft is used to transport the air outside the underground sewage treatment plant to the gas flow area through a fresh air fan; An exhaust air shaft, the bottom of which is connected to the gas flow area, the top of which protrudes above the ground, the top of which is provided with air outlet louvers, and the exhaust air shaft is used to discharge the gas in the gas flow area through an exhaust fan; A biological pool, located in the underground sewage treatment plant and outside the gas flow area, for receiving gas from the gas flow area or air outside the underground sewage treatment plant through an aeration blower and performing aeration treatment; A deodorizing discharge tower, the bottom of which is connected to the gas flow area, the top of which protrudes above the ground, and is used to use a deodorizing fan to deodorize the gas in the gas flow area and then discharge it; an aeration shaft, the bottom of which is located on one side of the aeration blower and the top of which protrudes above the ground, the top of which is provided with a first electric shutter, and the aeration shaft is used to transport the air outside the underground sewage treatment plant to the biological pool through the aeration blower; A gas detection device, located in the gas flow area, for detecting gas information, wherein the gas information includes the concentration of NH3, H2S, CH4, CO, CO2, and O2 gases; A control device, used for regulating the fresh air fan, the exhaust fan, the aeration blower and the deodorization emission tower according to the information of the gas and preset thresholds and weights; The control device calculates the comprehensive air quality index CAQI according to the following formula: Among them C i is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas, and n is the total number of harmful gases that need to be detected; When the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower, the first electric fan blade and the exhaust fan are all turned on, and the second electric fan blade located at the lower part of the aeration air shaft near the gas flow area and the third electric fan blade located at the lower part of the fresh air shaft near the gas flow area are both closed; When the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the fresh air fan, the deodorizing fan, the deodorizing exhaust tower, the aeration blower and the exhaust fan are all turned off, and the second electric fan blade and the third electric fan blade are both turned on.

2. The device according to claim 1, characterized in that: When the deodorizing emission tower is turned on, the relationship between the power P of the deodorizing emission tower and the comprehensive air quality index CAQI satisfies: Among them, P min is the minimum power of the deodorization emission tower, P max is the maximum power of the deodorizing emission tower, α is a preset adjustment coefficient, and e is a mathematical constant; The operating speed S of the deodorizing fan odor The power P of the deodorization emission tower satisfies: Among them, K odor is the gas treatment efficiency coefficient of the deodorization emission tower, and the formula is: K odor =β×log(γ×CAQI+δ); Among them, β, γ, and δ are adjustment coefficients related to the performance of the deodorization emission tower.

3. The device according to claim 2, characterized in that: When the exhaust fan is turned on, the operating speed S of the exhaust fan is exhaust The relationship with the comprehensive air quality index CAQI satisfies: in, S min_exhaust is the minimum speed of the exhaust fan, S max_exhaust is the maximum speed of the exhaust fan, and ζ is the preset adjustment coefficient; The operating speed S of the fresh air fan flow satisfy: S flow =S exhaust +S odor +S aeration Among them, S aeration is the extraction rate of the aeration blower, which refers to the rate at which the biological pond extracts gas from the gas flow area.

4. The device according to claim 3, characterized in that: When the aeration blower is turned on, the operating speed S of the aeration blower is aeration_fan satisfy: Where k is a constant, C BOD is the biochemical oxygen demand in the sewage in the biological pool, C BOD_std is the standard biochemical oxygen demand, V sewage is the volume of sewage in the biological pond; When the aeration blower operates at a speed S aeration_fan Less than or equal to the air flow rate S of the first electric fan blade first_damper When the electric valve from the gas flow area to the biological pool is closed, the extraction rate S of the aeration blower is aeration is zero; When the aeration blower operates at a speed S aeration_fan Greater than the air flow rate S of the first electric fan blade first_damper When the electric valve is opened, the extraction rate S of the aeration blower is aeration satisfy: S aeration =S aeration_fan -S first_damper 。 5. A gas management method applied to an underground sewage treatment plant, characterized in that: include: The air outside the underground sewage treatment plant is transported to the gas flow area through a fresh air blower; Using a deodorizing fan to transport the gas in the gas flow area to a deodorizing discharge tower for deodorization and then discharge; receiving gas from the gas flow area or air outside the underground sewage treatment plant through an aeration blower and performing aeration treatment; Exhausting the gas in the gas flow area by means of an exhaust fan; Detect gas information, including the concentration of NH3, H2S, CH4, CO, CO2, and O2 gases; Regulating the fresh air fan, the exhaust air fan, the aeration blower and the deodorization emission tower according to the gas information and the preset thresholds and weights; The regulation of the fresh air fan, the exhaust fan, the aeration blower and the deodorization emission tower according to the gas information and the preset thresholds and weights includes: Calculate the comprehensive air quality index CAQI: Among them C i is the actual concentration of the i-th harmful gas, T i is the standard threshold of the i-th harmful gas, W i is the weight of the i-th harmful gas; When the comprehensive air quality index CAQI is greater than the preset high threshold CAQI high When the deodorizing exhaust tower, the fresh air fan, the deodorizing fan, the aeration blower and the exhaust fan are turned on; When the comprehensive air quality index CAQI is less than or equal to the preset low threshold CAQI low When the deodorizing exhaust tower, the fresh air fan, the deodorizing fan, the aeration blower and the exhaust fan are turned off.

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