Regeneration system and method for activated carbon used in deodorization system of municipal sewage treatment plant

Abstract

The application discloses a regeneration system and method of activated carbon used in a deodorization system of a municipal sewage treatment plant, which comprises an in-situ regeneration cabin, one end of the in-situ regeneration cabin is provided with a feeding port and the other end is provided with a discharging port, a steam inlet, a tail gas outlet and a waste water outlet are further arranged on the in-situ regeneration cabin, the feeding port is in sealing connection with an activated carbon discharging port, the steam inlet is in sealing connection with a steam outlet of an existing steam system in the plant, the discharging port is in sealing connection with an activated carbon feeding port through a discharging conveying mechanism, the tail gas outlet is in sealing connection with a waste gas inlet of an existing waste gas treatment system in the plant, and the waste water outlet is in sealing connection with a waste water inlet of an existing waste water treatment system in the plant; a stirring conveying mechanism is arranged in the in-situ regeneration cabin. The regeneration system can adapt to the characteristics of the activated carbon used in the deodorization system of the municipal sewage treatment plant, fully utilize the existing steam system in the plant, the existing waste gas treatment system in the plant and the existing waste water treatment system in the plant, and realize in-situ regeneration of saturated activated carbon in the plant.

Description

Technical Field

[0001] This invention belongs to the field of municipal wastewater treatment technology, specifically relating to a regeneration system and method for activated carbon used in the deodorization system of a municipal wastewater treatment plant. Background Technology

[0002] During routine operation, municipal wastewater treatment plants generate large quantities of gases containing malodorous components such as hydrogen sulfide, ammonia nitrogen, and small amounts of volatile organic compounds (VOCs). To control the impact of these malodorous gases on the surrounding environment, a combination of processes, including chemical scrubbing, biological deodorization, and activated carbon adsorption, is typically used. However, the activated carbon used in the deodorization systems of municipal wastewater treatment plants is mostly kept on standby for emergencies. Under normal operating conditions, its adsorption load is low, and it is only put into high-intensity adsorption operation during peak wastewater inflow, process anomalies, or sudden malodorous leaks. The adsorption cycle is not fixed, and the degree of saturation varies significantly.

[0003] Compared with activated carbon used for industrial VOC adsorption, activated carbon used in municipal wastewater treatment plant deodorization systems differs significantly in terms of operating conditions, the characteristics of the adsorbed pollutants, and the performance requirements of the activated carbon.

[0004] (1) Differences in operating conditions: The activated carbon used in the deodorization system of municipal sewage treatment plants is mainly for emergency backup, and the adsorption process is characterized by intermittent operation; while the activated carbon used for industrial VOC adsorption is mainly for continuous operation, and the adsorption process is continuous and stable.

[0005] (2) Differences in pollutant adsorption: The pollutants adsorbed by the activated carbon used in the deodorization system of municipal sewage treatment plants are mainly low-concentration, multi-component malodorous substances, mainly hydrogen sulfide and ammonia nitrogen. The components are complex and the concentration fluctuates greatly, resulting in a low overall adsorption intensity. The pollutants adsorbed by the activated carbon used for industrial VOC adsorption are mainly high-concentration, single or a few types of VOCs. The adsorption intensity is high, and the components are relatively simple.

[0006] (3) Differences in performance requirements: Activated carbon used in municipal wastewater treatment plant deodorization systems focuses more on properties such as large adsorption capacity, fast adsorption speed and easy regeneration, and usually does not need to be resistant to high concentrations of corrosive substances; while activated carbon used for industrial VOC adsorption focuses on properties such as resistance to high concentrations, corrosion resistance and strong adsorption selectivity, and is relatively more difficult to regenerate.

[0007] Based on the above differences, the regeneration scenarios of activated carbon used in municipal wastewater treatment plant deodorization systems are fundamentally different from those of activated carbon used in industrial VOC adsorption: the regeneration of activated carbon used in industrial VOC adsorption is mostly a large-scale, continuous, off-site centralized regeneration mode, relying on large-scale regeneration equipment in professional regeneration plants, with relatively fixed regeneration process parameters that do not need to be adapted to on-site conditions; while the regeneration of activated carbon used in municipal wastewater treatment plant deodorization systems has obvious characteristics of "decentralization, intermittency, and emergency response", with regeneration requirements changing dynamically with the operating status of the deodorization system.

[0008] Currently, activated carbon regeneration methods mainly include thermal regeneration, chemical regeneration, and biological regeneration. Among these, steam regeneration is considered one of the preferred methods due to its relatively simple operation, good regeneration effect, and lack of chemical pollution. However, existing steam regeneration technologies are primarily designed and optimized for activated carbon used in industrial VOC adsorption, and have not been adapted to the characteristics and regeneration scenarios of activated carbon used in municipal wastewater treatment plant deodorization systems. Direct application to municipal scenarios results in the following core drawbacks:

[0009] First, most existing steam regeneration technologies are off-site regeneration models, which require the saturated activated carbon to be transported to an off-site regeneration plant. However, the activated carbon used in the deodorization system of municipal sewage treatment plants is classified as hazardous waste according to relevant management regulations. Off-site transportation must strictly follow standardized management requirements such as hazardous waste transfer manifests. This not only involves cumbersome operations and high transportation costs, but also poses risks of odor leakage and secondary pollution during transportation.

[0010] Secondly, since the activated carbon used in municipal wastewater treatment plant deodorization systems is mostly for emergency backup, with small batch regeneration volumes but irregular regeneration batches, while the regeneration batches of activated carbon used for industrial VOC adsorption are relatively fixed and have large batch regeneration volumes, existing off-site industrial-scale regeneration equipment is mainly designed for industrial VOC adsorption activated carbon. Therefore, existing technology is difficult to adapt to the dynamic regeneration needs of activated carbon used in municipal wastewater treatment plant deodorization systems. Specifically, the existing off-site regeneration process parameters are relatively fixed and do not take into account the characteristics of activated carbon used in municipal wastewater treatment plant deodorization systems, such as emergency backup, low concentration of adsorbed pollutants, and complex composition, and are not specifically adjusted. This can easily lead to incomplete regeneration or over-regeneration. If the regeneration is incomplete, the activated carbon adsorption capacity recovery rate will be low. If the regeneration is over-regenerated, it will not only waste energy but also easily damage the pore structure of the activated carbon, affecting its subsequent performance.

[0011] Third, existing off-site regeneration technologies fail to fully utilize the existing steam, exhaust gas treatment, and wastewater treatment conditions within municipal wastewater treatment plants. The steam required for regeneration often necessitates additional steam generation equipment, and the exhaust gas and wastewater containing odorous substances generated during the regeneration process also require additional treatment facilities. This significantly increases the construction and operating costs of the regeneration system, which is inconsistent with the concept of green and low-carbon development. In particular, some municipal wastewater treatment plants have already achieved sludge drying and incineration to generate steam and connect it to the grid for utilization, while existing regeneration technologies have failed to achieve efficient reuse of such on-site steam resources.

[0012] Fourth, activated carbon regenerated using existing off-site regeneration technology cannot be quickly reintroduced into the municipal wastewater treatment plant's deodorization system, making it difficult to meet the emergency response requirements of municipal deodorization. In addition, insufficient cooling and drying of the regenerated activated carbon can easily lead to problems such as clumping and mold growth, affecting the subsequent emergency adsorption effect. Furthermore, the off-site regeneration model requires the transfer of saturated activated carbon from the municipal wastewater treatment plant's deodorization system to the off-site regeneration plant and then the transfer of the regenerated activated carbon back to the municipal wastewater treatment plant's deodorization system. This requires two transfer operations, which can easily lead to a high activated carbon loss rate during the two transfer processes. Summary of the Invention

[0013] In view of the above-mentioned deficiencies of the prior art, the present invention provides a regeneration system and method for activated carbon used in the deodorization system of a municipal wastewater treatment plant, which can be adapted to the characteristics of activated carbon used in the deodorization system of a municipal wastewater treatment plant, and make full use of the existing steam system, the existing waste gas treatment system and the existing wastewater treatment system in the plant to achieve in-situ regeneration of saturated activated carbon in the plant.

[0014] The technical solution adopted by this invention to solve its technical problem is:

[0015] A regeneration system for activated carbon used in a deodorization system of a municipal wastewater treatment plant. The municipal wastewater treatment plant includes an existing steam system, an existing waste gas treatment system, and an existing wastewater treatment system. The deodorization system of the municipal wastewater treatment plant includes an activated carbon adsorption tower, which includes an activated carbon feed port and an activated carbon discharge port.

[0016] The regeneration system includes an in-situ regeneration chamber with a feed inlet at one end and a discharge outlet at the other. The chamber also includes a steam inlet, a tail gas outlet, and a wastewater outlet. The feed inlet is sealed to the activated carbon discharge port. The steam inlet is sealed to the steam outlet of the existing steam system within the plant. The discharge outlet is sealed to the activated carbon feed inlet via a discharge conveying mechanism. The tail gas outlet is sealed to the waste gas inlet of the existing waste gas treatment system within the plant. The wastewater outlet is sealed to the wastewater inlet of the existing wastewater treatment system within the plant. The in-situ regeneration chamber is equipped with a stirring and conveying mechanism for stirring and conveying the saturated activated carbon entering through the feed inlet, ensuring sufficient contact between the saturated activated carbon and the steam introduced through the steam inlet to achieve regeneration and form regenerated activated carbon.

[0017] Furthermore, an external insulation chamber is connected to the outside of the in-situ regeneration chamber. The wall of the external insulation chamber is a hollow wall, and the cavity of the hollow wall is filled with insulation material. The area between the inner surface of the wall of the external insulation chamber and the outer surface of the wall of the in-situ regeneration chamber forms a steam inlet cavity. A main steam inlet is provided on the wall of the external insulation chamber. There are multiple steam branch inlets, and the multiple steam branch inlets are located in the area enclosed by the steam inlet cavity and are evenly distributed on the corresponding walls at the top of the in-situ regeneration chamber. Each of the steam branch inlets is sealed and connected to the steam outlet of the existing steam system in the plant through the main steam inlet.

[0018] Furthermore, the feed inlet, discharge outlet, and exhaust gas outlet are all located outside the area enclosed by the steam inlet chamber. The feed inlet is located on the top wall of one end of the in-situ regeneration chamber, the discharge outlet is located on the bottom wall of the other end of the in-situ regeneration chamber, and the exhaust gas outlet is located on the top wall of the in-situ regeneration chamber near the discharge outlet. The wastewater outlet is located on the bottom wall of the in-situ regeneration chamber and is located within the area enclosed by the steam inlet chamber. The wastewater outlet is sealed to the wastewater inlet of the existing wastewater treatment system in the plant through a first wastewater conveying pipe that passes through the outer insulation chamber wall. A water pump is installed on the first wastewater conveying pipe.

[0019] Furthermore, the main steam inlet is sealed to the steam outlet of the existing steam system in the plant via a steam delivery pipe. A steam delivery volume regulating valve, a pressure regulating valve, and a flow meter are sequentially installed along the flow direction on the steam delivery pipe. A temperature sensor and a pressure sensor are installed in the steam inlet chamber. The regeneration system also includes a controller. The signal output terminals of the temperature sensor and the pressure sensor are respectively connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the steam delivery volume regulating valve.

[0020] Furthermore, the feed inlet is sealed to the activated carbon discharge port via a feed channel, and a feed valve is provided on the feed channel; the discharge port is provided with a discharge valve, and the discharge port is sealed to the feed inlet of the discharge conveying mechanism via a discharge channel, and the discharge port of the discharge conveying mechanism is sealed to the activated carbon feed inlet.

[0021] Furthermore, the discharge channel is provided with a cooling and drying air inlet on the side near the discharge port and an exhaust gas outlet on the side near the discharge conveying mechanism inlet. The cooling and drying air inlet is sealed to the air outlet of the cooling and drying blower, the exhaust gas outlet is sealed to the air inlet of the induced draft fan, and the air outlet of the induced draft fan is sealed to the exhaust gas inlet of the existing exhaust gas treatment system in the plant.

[0022] Furthermore, the exhaust gas outlet and the exhaust fan outlet are both sealed to the exhaust gas inlet of the condenser through a first exhaust gas delivery pipe. A concentration sensor is installed on the first exhaust gas delivery pipe. The coolant inlet of the condenser is sealed to the coolant input pipe, and the coolant outlet of the condenser is sealed to the coolant output pipe. The gas-liquid outlet of the condenser is sealed to the gas-liquid inlet of the gas-liquid separator through a gas-liquid delivery pipe. The gas outlet of the gas-liquid separator is sealed to the exhaust gas inlet of the existing waste gas treatment system in the plant through a second exhaust gas delivery pipe. The liquid outlet of the gas-liquid separator is sealed to the wastewater inlet of the existing wastewater treatment system in the plant through a second wastewater delivery pipe.

[0023] Furthermore, the wastewater outlet is sealed to the wastewater inlet of the wastewater pretreatment unit via a first wastewater conveying pipe, the liquid outlet of the gas-liquid separator is sealed to the wastewater inlet of the wastewater pretreatment unit via a second wastewater conveying pipe, and the wastewater outlet of the wastewater pretreatment unit is sealed to the wastewater inlet of the existing wastewater treatment system in the plant via a main wastewater conveying pipe.

[0024] Furthermore, the mixing and conveying mechanism is a spiral mixing conveyor, which includes a rotating shaft disposed within the in-situ regeneration chamber. The two ends of the rotating shaft are rotatably connected to the two end walls of the in-situ regeneration chamber, respectively. One end of the rotating shaft passes through the wall of the corresponding end of the in-situ regeneration chamber and is fixedly connected to the output end of the rotation drive source. Multiple spiral blades are fixed on the rotating shaft. The discharge conveying mechanism is a spiral conveyor elevator.

[0025] A method for regenerating activated carbon used in a municipal wastewater treatment plant's deodorization system employs the aforementioned activated carbon regeneration system. Specifically, when regeneration is required, saturated activated carbon in the activated carbon adsorption tower sequentially enters the in-situ regeneration chamber through the activated carbon discharge port and the feed port. Simultaneously, steam from the plant's existing steam system is sequentially introduced into the in-situ regeneration chamber through the steam outlet and steam distribution inlet. At the same time, the stirring and conveying mechanism is activated, which simultaneously conveys and stirs the saturated activated carbon in the in-situ regeneration chamber, ensuring sufficient contact between the saturated activated carbon and steam to achieve regeneration and form regenerated activated carbon. The regenerated activated carbon is discharged from the discharge port and conveyed to the activated carbon feed port via the discharge conveying mechanism, thus feeding the activated carbon adsorption tower. The exhaust gas generated during regeneration is discharged through the exhaust gas outlet and enters the plant's existing waste gas treatment system for deep treatment of the exhaust gas. Similarly, the wastewater generated during regeneration is discharged through the wastewater outlet and enters the plant's existing wastewater treatment system for deep treatment of the wastewater.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The activated carbon regeneration system used in the deodorization system of a municipal wastewater treatment plant in this invention includes an in-situ regeneration chamber. One end of the in-situ regeneration chamber has a feed inlet and the other end has a discharge outlet. The in-situ regeneration chamber also has a steam inlet, a tail gas outlet, and a wastewater outlet. The feed inlet is sealed to the activated carbon discharge port. The steam inlet is sealed to the steam outlet of the existing steam system in the plant. The discharge outlet is sealed to the activated carbon feed inlet via a discharge conveying mechanism. The tail gas outlet is sealed to the exhaust gas inlet of the existing waste gas treatment system in the plant. The wastewater outlet is sealed to the wastewater inlet of the existing wastewater treatment system in the plant. The in-situ regeneration chamber is equipped with a stirring and conveying mechanism for stirring and conveying the saturated activated carbon entering from the feed inlet, ensuring that the saturated activated carbon comes into full contact with the steam introduced from the steam inlet to achieve regeneration and form regenerated activated carbon. The in-situ regeneration chamber of this regeneration system is directly connected to the activated carbon adsorption tower of the municipal wastewater treatment plant's deodorization system. This eliminates the need for off-site activated carbon transfer and fully utilizes the existing steam, waste gas treatment, and wastewater treatment systems within the plant. It achieves in-situ regeneration of saturated activated carbon without requiring additional steam generation equipment, exhaust gas treatment facilities, or wastewater treatment facilities. This results in lower regeneration costs and solves the problems of complex off-site transfer management, high transfer costs, and high secondary pollution risks. It also addresses the issues of incomplete or over-regeneration that arise with existing off-site regeneration technologies. Furthermore, since the regenerated activated carbon is directly transported back to the activated carbon adsorption tower via the discharge conveyor, in-situ recycling of activated carbon is achieved without secondary handling. This ensures that activated carbon can be quickly deployed in emergency situations, meeting the emergency response requirements of municipal deodorization and resolving the problem of untimely emergency response in existing off-site regeneration technologies. Additionally, because off-site transfer and secondary handling are not required, the activated carbon loss rate is low. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the regeneration system of activated carbon used in the deodorization system of a municipal wastewater treatment plant in this invention.

[0029] Figure reference numerals: 101, In-situ regeneration chamber; 10101, Feed inlet; 10102, Discharge outlet; 10103, Steam inlet; 10104, Exhaust gas outlet; 10105, Wastewater outlet; 102, Discharge conveying mechanism; 10301, Rotating shaft; 10302, Rotation drive source; 10303, Spiral blade; 104, External insulation chamber; 10401, Main steam inlet; 105, Steam inlet chamber; 106, First wastewater conveying pipe; 107, Water pump; 108, Steam conveying pipe; 109, Steam conveying volume regulating valve; 1010, Pressure regulating valve; 1011, Flow meter; 1012, Safety valve; 1013, Temperature sensor; 1014, Pressure sensor; 1015, Feeding channel; 1 016. Feed valve; 1017. Discharge valve; 1018. Discharge channel; 101801. Cooling and drying air inlet; 101802. Exhaust gas outlet; 1019. Cooling and drying blower; 1020. Exhaust fan; 1021. First tail gas conveying pipe; 1022. Concentration sensor; 1023. Condenser; 1024. Coolant input pipe; 1025. Coolant output pipe; 1026. Gas-liquid conveying pipe; 1027. Gas-liquid separator; 1028. Second tail gas conveying pipe; 1029. Second wastewater conveying pipe; 1030. Wastewater pretreatment unit; 1031. Wastewater main conveying pipe; 2. Existing steam system in the plant; 3. Existing waste gas treatment system in the plant; 4. Existing wastewater treatment system in the plant; 5. Activated carbon adsorption tower. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] like Figure 1 As shown, a regeneration system for activated carbon used in a deodorization system of a municipal wastewater treatment plant is disclosed. The municipal wastewater treatment plant includes an existing steam system 2, an existing waste gas treatment system 3, and an existing wastewater treatment system 4. The deodorization system of the municipal wastewater treatment plant includes an activated carbon adsorption tower 5, which includes an activated carbon feed port and an activated carbon discharge port.

[0035] The regeneration system includes an in-situ regeneration chamber 101, with an inlet 10101 at one end and an outlet 10102 at the other end. The in-situ regeneration chamber 101 also includes a steam inlet 10103, a tail gas outlet 10104, and a wastewater outlet 10105. The inlet 10101 is sealed to the activated carbon discharge port, and the steam inlet 10103 is sealed to the steam outlet of the existing steam system 2 within the plant. The outlet 10102 is connected to the discharge conveyor 1. 02 is sealed to the activated carbon feeding port, the exhaust gas outlet 10104 is sealed to the exhaust gas inlet of the existing waste gas treatment system 3 in the plant, and the wastewater outlet 10105 is sealed to the wastewater inlet of the existing wastewater treatment system 4 in the plant; the in-situ regeneration chamber 101 is equipped with a stirring and conveying mechanism, which is used to stir and convey the saturated activated carbon entering from the feed port 10101, so that the saturated activated carbon can fully contact the steam introduced from the steam inlet 10103 to achieve regeneration and form regenerated activated carbon.

[0036] When regeneration is required, the saturated activated carbon in the activated carbon adsorption tower 5 enters the in-situ regeneration chamber 101 sequentially through the activated carbon discharge port and feed port 10101. Simultaneously, steam from the existing steam system 2 is introduced into the in-situ regeneration chamber 101 sequentially through the steam outlet and steam inlet 10103. At the same time, the stirring and conveying mechanism is activated, conveying and stirring the saturated activated carbon in the in-situ regeneration chamber 101 to ensure sufficient contact between the saturated activated carbon and steam, thus achieving regeneration and forming regenerated activated carbon. The regenerated activated carbon is discharged from the discharge port 10102 and conveyed to the activated carbon feed port via the discharge conveying mechanism 102, thus feeding the activated carbon adsorption tower 5. The exhaust gas generated during regeneration is discharged through the exhaust gas outlet 10104 and enters the existing waste gas treatment system 3 within the plant for deep treatment. The wastewater generated during regeneration is discharged through the wastewater outlet 10105 and enters the existing wastewater treatment system 4 within the plant for deep treatment. This regeneration system... The in-situ regeneration chamber 101 is directly connected to the activated carbon adsorption tower 5 of the municipal wastewater treatment plant's deodorization system. This eliminates the need for off-site activated carbon transfer and fully utilizes the existing steam system 2, waste gas treatment system 3, and wastewater treatment system 4 within the plant. This enables in-situ regeneration of saturated activated carbon without requiring additional steam generation equipment, exhaust gas treatment facilities, or wastewater treatment facilities. The regeneration cost is lower, resolving issues of complex off-site transfer management, high transfer costs, and high secondary pollution risks. It also addresses the problems of incomplete or over-regeneration resulting from existing off-site regeneration technologies. Furthermore, since the regenerated activated carbon is directly transported back to the activated carbon adsorption tower 5 via the discharge conveyor 102, in-situ recycling of activated carbon is achieved without secondary handling. This ensures rapid deployment of activated carbon in emergency situations, meeting the emergency response requirements of municipal deodorization and resolving the issue of untimely emergency response in existing off-site regeneration technologies. Additionally, the elimination of off-site transfer and secondary handling results in a lower activated carbon loss rate.

[0037] Because the feed inlet 10101 is sealed to the activated carbon discharge port, the steam inlet 10103 is sealed to the steam outlet of the existing steam system 2 in the plant, the discharge port 10102 is sealed to the activated carbon feed port through the discharge conveying mechanism 102, the tail gas outlet 10104 is sealed to the waste gas inlet of the existing waste gas treatment system 3 in the plant, and the wastewater outlet 10105 is sealed to the wastewater inlet of the existing wastewater treatment system 4 in the plant, this regeneration system is in a closed state during the regeneration process of saturated activated carbon, which complies with the hazardous waste treatment regulations.

[0038] In one embodiment, an external insulation chamber 104 is connected to the outside of the in-situ regeneration chamber 101. The wall of the external insulation chamber 104 is a hollow wall, and the cavity of the hollow wall is filled with insulation material. The area between the inner surface of the wall of the external insulation chamber 104 and the outer surface of the wall of the in-situ regeneration chamber 101 forms a steam inlet chamber 105. A main steam inlet 10401 is provided on the wall of the external insulation chamber 104. There are multiple steam branch inlets 10103, and the multiple steam branch inlets 10103 are located within the area enclosed by the steam inlet chamber 105 and are evenly distributed on the corresponding walls at the top of the in-situ regeneration chamber 101. Each steam branch inlet 10103 is sealed to the steam outlet of the existing steam system 2 in the plant through the main steam inlet 10401. Preferably, the insulation material is aluminum silicate fiber insulation material.

[0039] The external insulation chamber 104 effectively insulates the steam and saturated activated carbon entering the in-situ regeneration chamber 101, ensuring a stable regeneration temperature for the saturated activated carbon and thus guaranteeing its regeneration effect. Furthermore, the steam inlet chamber 105 allows steam to first enter through the main steam inlet 10401, and then through multiple steam branch inlets 10103 at different locations on the top wall of the in-situ regeneration chamber 101, where it is evenly sprayed onto the saturated activated carbon, ensuring sufficient contact between the saturated activated carbon and the steam.

[0040] The feed inlet 10101, discharge outlet 10102, and exhaust outlet 10104 are all located outside the area enclosed by the steam inlet chamber 105. The feed inlet 10101 is located on the top wall of one end of the in-situ regeneration chamber 101, the discharge outlet 10102 is located on the bottom wall of the other end of the in-situ regeneration chamber 101, and the exhaust outlet 10104 is located on the top wall of the in-situ regeneration chamber 101 near the discharge outlet 10102. The wastewater outlet 10105 is located on the bottom wall of the in-situ regeneration chamber 101 and is located within the area enclosed by the steam inlet chamber 105. The wastewater outlet 10105 is sealed to the wastewater inlet of the existing wastewater treatment system 4 in the plant through a first wastewater conveying pipe 106 that passes through the wall of the outer insulation chamber 104. A water pump 107 is installed on the first wastewater conveying pipe 106.

[0041] The main steam inlet 10401 is sealed to the steam outlet of the existing steam system 2 within the plant via a steam delivery pipe 108. A steam delivery volume regulating valve 109, a pressure regulating valve 1010, and a flow meter 1011 are sequentially installed along the flow direction on the steam delivery pipe 108. A temperature sensor 1013 and a pressure sensor 1014 are installed in the steam inlet chamber 105. The regeneration system also includes a controller. The signal output terminals of the temperature sensor 1013 and the pressure sensor 1014 are respectively communicatively connected to the signal input terminal of the controller. The signal output terminal of the controller is communicatively connected to the steam delivery volume regulating valve 109. Preferably, a safety valve 1012 is also installed on the steam delivery pipe 108 between the pressure regulating valve 1010 and the flow meter 1011.

[0042] During the regeneration process, the temperature sensor 1013 detects the temperature inside the steam inlet chamber 105, i.e., the regeneration temperature inside the in-situ regeneration chamber 101, in real time and transmits it to the controller. The pressure sensor 1014 detects the pressure inside the steam inlet chamber 105, i.e., the regeneration pressure inside the in-situ regeneration chamber 101, in real time and transmits it to the controller. Based on the received regeneration temperature and regeneration pressure, the controller controls the opening of the steam delivery regulating valve 109 accordingly to regulate the amount of steam entering the steam inlet chamber 105.

[0043] The regeneration temperature is controlled at 160-200℃, and the regeneration temperature is controlled in stages. The first stage is controlled at 160-180℃ to desorb volatile odorous substances, and the second stage is controlled at 180-200℃ to desorb odorous substances that are difficult to desorb.

[0044] The pressure regulating valve 1010 is used to regulate the steam pressure in the steam delivery pipe 108 to adapt to the characteristics of steam pressure fluctuations output by the existing steam system 2 in the plant. The flow meter 1011 is used to detect the steam flow rate in the steam delivery pipe 108. When the steam pressure in the steam delivery pipe 108 exceeds the set pressure, the safety valve 1012 automatically releases the pressure.

[0045] In one embodiment, the feed inlet 10101 is sealed to the activated carbon discharge port through the feed channel 1015, and the feed channel 1015 is provided with a feed valve 1016; the discharge port 10102 is provided with a discharge valve 1017, the discharge port 10102 is sealed to the inlet of the discharge conveying mechanism 102 through the discharge channel 1018, and the discharge port of the discharge conveying mechanism 102 is sealed to the activated carbon feeding port.

[0046] By controlling the opening of the feed valve 1016, the feed rate can be controlled to ensure a stable amount of saturated activated carbon filling in the in-situ regeneration chamber 101. By controlling the opening of the discharge valve 1017, the discharge rate can be controlled, with the discharge rate matching the feed rate.

[0047] The discharge channel 1018 has a cooling and drying air inlet 101801 on the side near the discharge port 10102 and an exhaust gas outlet 101802 on the side near the inlet of the discharge conveying mechanism 102. The cooling and drying air inlet 101801 is sealed to the outlet of the cooling and drying blower 1019, the exhaust gas outlet 101802 is sealed to the inlet of the induced draft fan 1020, and the outlet of the induced draft fan 1020 is sealed to the exhaust gas inlet of the existing exhaust gas treatment system 3 in the plant.

[0048] During the discharge process, the cooling and drying blower 1019 blows cooling and drying air into the discharge channel 1018. This air then comes into full contact with the high-temperature regenerated activated carbon discharged from the discharge port 10102 into the discharge channel 1018, cooling the activated carbon to room temperature and drying it. This prevents the high-temperature regenerated activated carbon from being directly added to the activated carbon adsorption tower 5, which would affect its operation. It also prevents the moisture-laden regenerated activated carbon from clumping or becoming moldy, thus affecting subsequent emergency adsorption. The exhaust gas generated from this contact with the high-temperature regenerated activated carbon is extracted from the discharge channel 1018 and sent to the existing waste gas treatment system 3 for treatment. Preferably, the cooling temperature of the regenerated activated carbon is controlled at 25-35℃ and the cooling time is controlled at 20-40 minutes, resulting in a moisture content of less than 10% after drying.

[0049] The regenerated activated carbon is transported back to activated carbon adsorption tower 5 and immediately enters standby mode without additional processing, meeting the emergency deodorization needs of municipalities.

[0050] Preferably, the exhaust gas outlet 10104 and the exhaust outlet of the induced draft fan 1020 are both sealed to the exhaust gas inlet of the condenser 1023 through the first exhaust gas delivery pipe 1021. A concentration sensor 1022 is provided on the first exhaust gas delivery pipe 1021. The coolant inlet of the condenser 1023 is sealed to the coolant input pipe 1024. The coolant outlet of the condenser 1023 is sealed to the coolant output pipe 1025. The gas-liquid outlet of the condenser 1023 is sealed to the gas-liquid inlet of the gas-liquid separator 1027 through the gas-liquid delivery pipe 1026. The gas outlet of the gas-liquid separator 1027 is sealed to the exhaust gas inlet of the existing waste gas treatment system 3 in the plant through the second exhaust gas delivery pipe 1028. The liquid outlet of the gas-liquid separator 1027 is sealed to the wastewater inlet of the existing wastewater treatment system 4 in the plant through the second wastewater delivery pipe 1029.

[0051] By installing the condenser 1023, the wastewater vapor carried in the exhaust gas discharged from the exhaust gas outlet 10104 and the exhaust fan 1020 can be condensed into wastewater. By installing the gas-liquid separator 1027, the mixture of exhaust gas and wastewater discharged from the gas-liquid outlet of the condenser 1023 can be separated into gas and liquid, thereby reducing the treatment load of the existing waste gas treatment system 3 in the plant.

[0052] The condensate wastewater generated during the regeneration process, which is the wastewater discharged from the liquid outlet of the gas-liquid separator 1027, and the washing wastewater generated during the regeneration process, which is the wastewater discharged from the wastewater outlet 10105, are both treated uniformly by the existing wastewater treatment system 4 in the plant.

[0053] The concentration sensor 1022 can detect the concentration of malodorous substances in the exhaust gas in the first exhaust gas delivery pipe 1021.

[0054] More preferably, the wastewater outlet 10105 is sealed to the wastewater inlet of the wastewater pretreatment unit 1030 via the first wastewater conveying pipe 106, the liquid outlet of the gas-liquid separator 1027 is sealed to the wastewater inlet of the wastewater pretreatment unit 1030 via the second wastewater conveying pipe 1029, and the wastewater outlet 10105 of the wastewater pretreatment unit 1030 is sealed to the wastewater inlet of the existing wastewater treatment system 4 in the plant via the main wastewater conveying pipe 1031.

[0055] By setting up the wastewater pretreatment unit 1030, the wastewater can be filtered to remove impurities and neutralized to remove acidic and alkaline substances, thus preventing untreated wastewater from being directly discharged into the existing wastewater treatment system 4 in the plant and affecting its normal operation.

[0056] In one embodiment, the mixing and conveying mechanism is a spiral mixing conveyor, which includes a rotating shaft 10301. The rotating shaft 10301 is disposed inside the in-situ regeneration chamber 101. Both ends of the rotating shaft 10301 are rotatably connected to the end walls of the in-situ regeneration chamber 101, and one end of the rotating shaft 10301 passes through the wall of the corresponding end of the in-situ regeneration chamber 101 and is fixedly connected to the output end of the rotation drive source 10302. Multiple spiral blades 10303 are fixed on the rotating shaft 10301. The discharge conveying mechanism 102 is a spiral conveying elevator. The rotation drive source 10302 is a geared motor.

[0057] The rotation speed of shaft 10301 can be flexibly adjusted according to the saturation level of the activated carbon to accommodate the large differences in adsorption saturation levels of activated carbon used in municipal wastewater treatment plant deodorization systems. Preferably, the rotation speed of shaft 10301 is adjustable within the range of 0.5-3 r / min. For activated carbon with a low saturation level, low-speed stirring is used to avoid over-regeneration and energy waste; for activated carbon with a high saturation level, high-speed stirring is used to ensure thorough regeneration.

[0058] A method for regenerating activated carbon used in a municipal wastewater treatment plant deodorization system involves regenerating activated carbon using the aforementioned regeneration system. Specifically, when regeneration is required, saturated activated carbon in the activated carbon adsorption tower 5 sequentially enters the in-situ regeneration chamber 101 through the activated carbon discharge port and inlet 10101. Simultaneously, steam from the existing steam system 2 within the plant is sequentially introduced into the in-situ regeneration chamber 101 through the steam outlet and steam distribution inlet 10103. At the same time, a stirring and conveying mechanism is activated, which simultaneously conveys the saturated activated carbon within the in-situ regeneration chamber 101 while simultaneously stirring and conveying the activated carbon. The activated carbon is stirred to ensure full contact between the saturated activated carbon and steam for regeneration, forming regenerated activated carbon. The regenerated activated carbon is discharged from the discharge port 10102 and conveyed to the activated carbon feeding port through the discharge conveying mechanism 102, thus feeding the activated carbon adsorption tower 5. The exhaust gas generated during the regeneration process is discharged through the exhaust gas outlet 10104 and enters the existing waste gas treatment system 3 in the plant for deep treatment of the exhaust gas, ensuring that the exhaust gas emissions meet the standards. The washing wastewater generated during the regeneration process is discharged through the wastewater outlet 10105 and enters the existing wastewater treatment system 4 in the plant for deep treatment of the wastewater, avoiding secondary pollution.

[0059] In summary, this regeneration system is suitable for the in-situ efficient regeneration of saturated activated carbon in the deodorization system of municipal wastewater treatment plants. It is fully adapted to the characteristics of the activated carbon used in the deodorization system of municipal wastewater treatment plants and the existing resources in the plant, realizing the recycling of activated carbon, reducing regeneration costs, and avoiding the risks of off-site transportation.

[0060] When the municipal wastewater treatment plant's deodorization system is in emergency operation mode, this regeneration system starts intermittent regeneration mode to regenerate saturated activated carbon in batches to ensure the stable operation of the municipal wastewater treatment plant's deodorization system. When the municipal wastewater treatment plant's deodorization system is in daily standby mode, this regeneration system starts continuous regeneration mode to centrally regenerate saturated activated carbon in order to improve regeneration efficiency.

[0061] The regeneration process parameters of this regeneration system, such as regeneration temperature, rotation speed of the stirring and conveying mechanism, and activated carbon treatment capacity per unit time, need to be flexibly adjusted according to the steam pressure of the existing steam system 2, the treatment load of the existing waste gas treatment system 3, and the treatment load of the existing wastewater treatment system 4 in the municipal wastewater treatment plant. This ensures that the regeneration system operates in coordination with the existing steam system 2, the existing waste gas treatment system 3, and the existing wastewater treatment system 4 in the plant, avoiding any impact on the original processes in the plant and fully leveraging the reuse value of the plant's resources.

[0062] After regenerating saturated activated carbon using this regeneration system, the recovery rate of activated carbon can be ensured to be greater than or equal to 90%.

[0063] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A regeneration system for activated carbon used in a deodorization system of a municipal wastewater treatment plant, the municipal wastewater treatment plant including an existing steam system (2), an existing waste gas treatment system (3), and an existing wastewater treatment system (4), the municipal wastewater treatment plant deodorization system including an activated carbon adsorption tower (5), the activated carbon adsorption tower (5) including an activated carbon feed port and an activated carbon discharge port; characterized in that: The regeneration system includes an in-situ regeneration chamber (101), one end of which has a feed inlet (10101) and the other end has a discharge outlet (10102). The in-situ regeneration chamber (101) is also provided with a steam inlet (10103), a tail gas outlet (10104), and a wastewater outlet (10105). The feed inlet (10101) is sealed to the activated carbon discharge port, the steam inlet (10103) is sealed to the steam outlet of the existing steam system (2) in the plant, and the discharge outlet (10102) discharges the activated carbon. The conveying mechanism (102) is sealed to the activated carbon feeding port, the tail gas outlet (10104) is sealed to the waste gas inlet of the existing waste gas treatment system (3) in the plant, and the wastewater outlet (10105) is sealed to the wastewater inlet of the existing wastewater treatment system (4) in the plant. The in-situ regeneration chamber (101) is equipped with a stirring and conveying mechanism for stirring and conveying the saturated activated carbon entering from the feed port (10101) so that the saturated activated carbon can fully contact the steam introduced from the steam inlet (10103) to achieve regeneration and form regenerated activated carbon.

2. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 1, characterized in that: The in-situ regeneration chamber (101) is connected to an external insulation chamber (104). The wall of the external insulation chamber (104) is a hollow wall and the cavity of the hollow wall is filled with insulation material. The area between the inner surface of the wall of the external insulation chamber (104) and the outer surface of the wall of the in-situ regeneration chamber (101) forms a steam inlet chamber (105). The wall of the external insulation chamber (104) is provided with a steam main inlet (10401). There are multiple steam sub-inlets (10103), and the multiple steam sub-inlets (10103) are located in the area enclosed by the steam inlet chamber (105) and are evenly distributed on the corresponding wall at the top of the in-situ regeneration chamber (101). Each of the steam sub-inlets (10103) is sealed to the steam outlet of the existing steam system (2) in the plant through the steam main inlet (10401).

3. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 2, characterized in that: The feed inlet (10101), discharge outlet (10102), and exhaust gas outlet (10104) are all located outside the area enclosed by the steam inlet chamber (105). The feed inlet (10101) is located on the top wall of one end of the in-situ regeneration chamber (101), the discharge outlet (10102) is located on the bottom wall of the other end of the in-situ regeneration chamber (101), and the exhaust gas outlet (10104) is located near the discharge outlet (10102) in the in-situ regeneration chamber. The wastewater outlet (10105) is located on the top wall of the in-situ regeneration chamber (101) and is within the area enclosed by the steam inlet chamber (105). The wastewater outlet (10105) is sealed to the wastewater inlet of the existing wastewater treatment system (4) in the plant through a first wastewater conveying pipe (106) that passes through the wall of the outer insulation chamber (104). A water pump (107) is provided on the first wastewater conveying pipe (106).

4. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 2, characterized in that: The main steam inlet (10401) is sealed to the steam outlet of the existing steam system (2) in the plant via a steam delivery pipe (108). A steam delivery volume regulating valve (109), a pressure regulating valve (1010), and a flow meter (1011) are sequentially arranged along the flow direction on the steam delivery pipe (108). A temperature sensor (1013) and a pressure sensor (1014) are arranged in the steam inlet chamber (105). The regeneration system also includes a controller. The signal output terminals of the temperature sensor (1013) and the pressure sensor (1014) are respectively connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the steam delivery volume regulating valve (109).

5. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 1, characterized in that: The feed inlet (10101) is sealed to the activated carbon discharge port through the feed channel (1015), and the feed channel (1015) is provided with a feed valve (1016); the discharge port (10102) is provided with a discharge valve (1017), the discharge port (10102) is sealed to the inlet of the discharge conveying mechanism (102) through the discharge channel (1018), and the discharge port of the discharge conveying mechanism (102) is sealed to the activated carbon feeding port.

6. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 5, characterized in that: The discharge channel (1018) is provided with a cooling and drying air inlet (101801) on the side near the discharge port (10102) and an exhaust gas outlet (101802) on the side near the inlet of the discharge conveying mechanism (102). The cooling and drying air inlet (101801) is sealed to the outlet of the cooling and drying blower (1019), the exhaust gas outlet (101802) is sealed to the inlet of the induced draft fan (1020), and the outlet of the induced draft fan (1020) is sealed to the exhaust gas inlet of the existing exhaust gas treatment system (3) in the plant.

7. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 6, characterized in that: The exhaust gas outlet (10104) and the exhaust port of the induced draft fan (1020) are both sealed to the exhaust gas inlet of the condenser (1023) via a first exhaust gas delivery pipe (1021). A concentration sensor (1022) is installed on the first exhaust gas delivery pipe (1021). The coolant inlet of the condenser (1023) is sealed to the coolant input pipe (1024), and the coolant outlet of the condenser (1023) is sealed to the coolant output pipe (1025). The gas-liquid outlet of the condenser (1023) is sealed to the gas-liquid inlet of the gas-liquid separator (1027) through a gas-liquid conveying pipe (1026). The gas outlet of the gas-liquid separator (1027) is sealed to the waste gas inlet of the existing waste gas treatment system (3) in the plant through a second tail gas conveying pipe (1028). The liquid outlet of the gas-liquid separator (1027) is sealed to the waste water inlet of the existing waste water treatment system (4) in the plant through a second waste water conveying pipe (1029).

8. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 7, characterized in that: The wastewater outlet (10105) is sealed to the wastewater inlet of the wastewater pretreatment unit (1030) via the first wastewater conveying pipe (106). The liquid outlet of the gas-liquid separator (1027) is sealed to the wastewater inlet of the wastewater pretreatment unit (1030) via the second wastewater conveying pipe (1029). The wastewater outlet (10105) of the wastewater pretreatment unit (1030) is sealed to the wastewater inlet of the existing wastewater treatment system (4) in the plant via the main wastewater conveying pipe (1031).

9. The activated carbon regeneration system for a municipal wastewater treatment plant deodorization system according to claim 1, characterized in that: The mixing and conveying mechanism is a spiral mixing conveyor, which includes a rotating shaft (10301). The rotating shaft (10301) is located inside the in-situ regeneration chamber (101). Both ends of the rotating shaft (10301) are rotatably connected to the two end walls of the in-situ regeneration chamber (101). One end of the rotating shaft (10301) passes through the wall of the corresponding end of the in-situ regeneration chamber (101) and is fixedly connected to the output end of the rotation drive source (10302). Multiple spiral blades (10303) are fixed on the rotating shaft (10301). The discharge conveying mechanism (102) is a spiral conveying elevator.

10. A method for regenerating activated carbon used in a municipal wastewater treatment plant deodorization system, comprising regenerating activated carbon using a regeneration system for a municipal wastewater treatment plant deodorization system as described in any one of claims 1-9, characterized in that, Specifically, when regeneration is required, the saturated activated carbon in the activated carbon adsorption tower (5) enters the in-situ regeneration chamber (101) sequentially through the activated carbon discharge port and the feed port (10101). At the same time, the steam in the existing steam system (2) in the plant is introduced into the in-situ regeneration chamber (101) sequentially through the steam outlet and the steam distribution inlet (10103). Simultaneously, the stirring and conveying mechanism is activated. While conveying the saturated activated carbon in the in-situ regeneration chamber (101), the stirring and conveying mechanism stirs the saturated activated carbon, so that the saturated activated carbon is mixed with steam. The activated carbon is regenerated by contact and regenerated activated carbon is formed. The regenerated activated carbon is discharged from the discharge port (10102) and transported to the activated carbon feeding port through the discharge conveying mechanism (102) to feed the activated carbon adsorption tower (5). The tail gas generated during the regeneration process is discharged through the tail gas outlet (10104) and enters the existing waste gas treatment system (3) in the plant to achieve deep treatment of the tail gas. The wastewater generated during the regeneration process is discharged through the wastewater outlet (10105) and enters the existing wastewater treatment system (4) in the plant to achieve deep treatment of the wastewater.

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