Sewage treatment system

Abstract

The sewage treatment system provided by the invention comprises an efficient sedimentation tank, a lifting pump room, a deep bed filter tank, an oxidation tank and a connecting pipeline system, the efficient sedimentation tank is arranged between the secondary sedimentation tank and the lifting pump room and is used for removing SS (suspended solids) and TP (total phosphorus) in the sewage; the lifting pump room is used for ensuring the hydraulic smoothness of the sewage in the sewage treatment process of the sewage treatment system; the deep-bed filter tank is used for removing total nitrogen (TN) and new pollutants (ECs) in the sewage, and the deep-bed filter tank is positioned at the upstream or downstream of the oxidation tank; the oxidation pond is used for removing chromaticity, refractory organic matters and ECs in the sewage; and the connecting pipeline is used for conveying water flow of sewage of the sewage treatment system, and switching among multiple operation modes of the sewage system is realized by opening and closing a gate of the connecting pipeline. According to the invention, the removal effect on different pollutants is enhanced, especially the removal capability on new pollutants (ECs) is enhanced, and increasingly strict sewage treatment standards are met.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a sewage treatment system. Background Art

[0002] As global environmental problems become increasingly severe, sewage treatment standards continue to improve, and traditional secondary treatment processes can no longer meet the needs of modern sewage treatment. Especially in some areas with high water quality requirements, sewage treatment plants not only need to remove suspended solids (SS), but also need to deeply treat pollutants such as total nitrogen (TN), total phosphorus (TP), and organic matter (COD). In recent years, with the discovery of new pollutants (ECs), sewage treatment plants are facing greater challenges. New pollutants include drug residues, endocrine disruptors, etc. These substances are difficult to effectively remove in traditional treatment processes and have potential hazards to the environment and human health.

[0003] At present, the deep treatment facilities of domestic sewage treatment plants are mainly used to remove suspended solids (SS). Some areas with higher water quality requirements also need to set up treatment facilities for pollutants such as total nitrogen (TN), total phosphorus (TP), and organic matter (COD). Commonly used deep treatment facilities include coagulation + sedimentation + filtration, high-efficiency sedimentation tanks, denitrification filters, deep bed filters, flotation, ozone oxidation, and advanced oxidation processes. However, these facilities usually have a single operating mode and cannot flexibly respond to different treatment needs. Especially when faced with increased effluent assessment indicators, traditional sewage treatment plants often face the problem of suspension of production and transformation.

[0004] Therefore, how to dynamically adjust the treatment mode during sewage treatment to improve the ability to remove different pollutants while ensuring the efficient and stable operation of the system is an urgent problem to be solved in the current sewage treatment field.

[0005] Traditional sewage treatment plants have a single operating mode and cannot flexibly respond to different treatment needs. When faced with different effluent assessment indicators, the system often needs to be transformed or adjusted on a large scale, which not only increases operating costs, but also affects the normal operation of the sewage treatment plant. In addition, traditional deep treatment facilities have limited effects in treating new pollutants (ECs) and cannot meet increasingly stringent environmental protection requirements. Therefore, there is an urgent need for a sewage treatment system that can flexibly switch operating modes and adapt to different treatment needs, so as to improve the system's ability to resist shock loads and enhance the removal of new pollutants. Summary of the invention

[0006] The present invention aims to provide a sewage treatment system that is used to adapt to sewage treatment systems with different treatment requirements, so as to improve the sewage treatment system's ability to resist shock loads and enhance the removal effect of new pollutants, thereby solving the above-mentioned technical problems.

[0007] According to one aspect of the present invention, there is provided a sewage treatment system, comprising: a high-efficiency sedimentation tank, a lift pump room, a deep bed filter, an oxidation tank and a connecting pipe system; the high-efficiency sedimentation tank is arranged between the secondary sedimentation tank and the lift pump room, and is used to remove suspended solids SS and total phosphorus TP in the sewage; the lift pump room is used to ensure the hydraulic smoothness of the sewage in the sewage treatment process of the sewage treatment system; the deep bed filter is used to remove total nitrogen TN and new pollutants ECs from the sewage, and the deep bed filter is located upstream or downstream of the oxidation tank; the oxidation tank is used to remove chromaticity, difficult-to-degrade organic matter and the ECs in the water of the sewage; the connecting pipe is used for water flow transportation of the sewage in the sewage treatment system, and the switching between multiple operating modes of the sewage system is achieved by opening and closing the gate of the connecting pipe.

[0008] Preferably, the multi-mode of the sewage treatment system includes:

[0009] Mode 1, through the operation mode of the high-efficiency sedimentation tank, the deep bed filter, and the oxidation tank, the SS, the TP, the TN, the chromaticity and part of the ECs in the sewage are removed;

[0010] Mode 2, through the operation mode of the high-efficiency sedimentation tank, the deep bed filter, and the oxidation tank, the SS, the TP, the TN, the chromaticity, and the difficult-to-degrade organic matter and the ECs are removed. After the removal operation, the content of the difficult-to-degrade organic matter in the sewage is less than a first preset value, and the content of the ECs in the sewage is less than a second preset value;

[0011] Mode 3, through the operation mode of the high-efficiency sedimentation tank, the oxidation tank, and the biological filter, the SS, the TP, the chromaticity and a small amount of TN are removed, and the difficult-to-degrade organic matter and the ECs are removed, wherein after the removal operation, the content of the difficult-to-degrade organic matter in the sewage is less than a third preset value, and the content of the ECs in the sewage is less than a fourth preset value; wherein the first preset value is greater than the third preset value, and the second preset value is greater than the fourth preset value.

[0012] Preferably, the operating parameters of the deep bed filter in mode 1 and mode 3 are different; and the deep bed filter in mode 1 and mode 3 adjusts the dominant microbial population of the filler.

[0013] Preferably, in the mode 1 and the mode 2, the deep bed filter is used as a denitrification filter, the microorganisms on the filler include: denitrifying bacteria, and the operating parameters are used to remove the TN;

[0014] In Mode 3, the deep bed filter is converted to a biological filter, the microorganisms on the filler include: a bacterial community for degrading the difficult-to-degrade organic matter and the new pollutants, and the operating parameters are used to remove the difficult-to-degrade organic matter and the new pollutants.

[0015] Preferably, when the oxidation pool is in mode 1, mode 2 and mode 3, the operating parameters of the oxidation pool are adjusted.

[0016] Preferably, in the mode 1, the ozone dosing concentration of the oxidation tank is a first concentration, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned off to remove the chromaticity;

[0017] In Mode 2 and Mode 3, the ozone dosage concentration of the oxidation pond is a second concentration, the ultraviolet irradiation system and the hydrogen peroxide dosage system are turned on to remove the difficult-to-degrade organic matter and the new pollutants; wherein the first concentration is less than the second concentration.

[0018] Preferably, the oxidation pond comprises: an ozone dosing system, an ultraviolet irradiation system and a hydrogen peroxide dosing system.

[0019] Preferably, the lifting pump room adopts frequency conversion control, and the flow rate and lift of the lifting water pump are automatically adjusted according to the inlet water volume and water quality.

[0020] Preferably, the ozone dosing system, ultraviolet irradiation system and hydrogen peroxide dosing system of the oxidation pond are automatically controlled by PLC and automatically adjusted according to the influent water quality and operation mode.

[0021] Preferably, the above system also includes: an online monitoring system, the monitoring parameters of the online detection system include inlet water quality, outlet water quality, ozone dosage, ultraviolet irradiation intensity, hydrogen peroxide dosage, and the monitoring data is transmitted wirelessly to the central control room.

[0022] The present invention provides a sewage treatment system, including: an efficient sedimentation tank, a lifting pump room, a deep bed filter, an oxidation tank and a connecting pipeline system; the efficient sedimentation tank is arranged between the secondary sedimentation tank and the lifting pump room, and is used to remove suspended solids SS and total phosphorus TP in the sewage; the lifting pump room is used to ensure the hydraulic smoothness of sewage in the sewage treatment process of the sewage treatment system; the deep bed filter is used to remove total nitrogen TN and new pollutants ECs in the sewage, and the position of the deep bed filter is upstream or downstream of the oxidation tank; the oxidation tank is used to remove chromaticity, difficult-to-degrade organic matter and ECs in the water of the sewage; the connecting pipeline is used for the water flow transportation of the sewage in the sewage treatment system, and the switching between multiple modes of the operation mode of the sewage system is realized by opening and closing the gate of the connecting pipeline. The present invention realizes the multi-mode operation of the sewage treatment system by setting an efficient sedimentation tank, a deep bed filter and an advanced oxidation tank, and combining the gate switching of the connecting pipeline. The system can flexibly switch the operation mode according to different treatment requirements, thereby reducing the operation cost while ensuring the effluent water quality. This application not only improves the sewage system's ability to resist shock loads, but also enhances the removal effect of different pollutants, especially the removal capacity of new pollutants (ECs), meeting increasingly stringent sewage treatment standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 is a schematic diagram of mode 1 operation provided according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of mode 2 operation provided according to an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of mode 3 operation provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] This embodiment provides a sewage treatment system, which may include: a high-efficiency sedimentation tank, a lift pump room, a deep bed filter, an oxidation tank, and a connecting pipe system. The high-efficiency sedimentation tank is arranged between the secondary sedimentation tank and the lift pump room, and is used to remove suspended solids SS and total phosphorus TP in the sewage; the lift pump room is used to ensure the hydraulic smoothness of sewage in the sewage treatment process of the sewage treatment system; the deep bed filter is used to remove total nitrogen TN and new pollutants ECs in the sewage, and the deep bed filter is located upstream or downstream of the oxidation tank; the oxidation tank is used to remove chromaticity, difficult-to-degrade organic matter and ECs in the sewage water; the connecting pipe is used for the water flow transportation of the sewage in the sewage treatment system, and the switching between multiple modes of the operation mode of the sewage system is realized by opening and closing the gate of the connecting pipe.

[0030] The sewage treatment system in the related art has a fixed structure, which makes it difficult to flexibly adjust the treatment method when the sewage flow rate changes, the pollutant concentration fluctuates, etc., and thus cannot efficiently cope with the variable sewage composition and water quality changes. The present invention solves the problem of poor shock load resistance of related technologies in the face of different working conditions through a switchable sewage treatment system, and optimizes the sewage treatment process through mode switching, which can cope with different pollutant treatment requirements and ensure the effluent water quality and the stability of system operation.

[0031] Secondary sedimentation tank, usually the sedimentation tank after biological treatment is called secondary sedimentation tank or final sedimentation tank (final sedimentation tank). The function of the secondary sedimentation tank is to separate mud and water, clarify the mixed liquor, concentrate the sludge and return the separated sludge to the biological treatment section. The effect directly affects the water quality of the effluent and the concentration of the return sludge. Because the sedimentation and concentration effect is not good, the activated sludge suspended matter will increase in the effluent, thereby increasing the BOD mass concentration of the effluent; at the same time, the concentration of the return sludge will also decrease, thereby reducing the concentration of the mixed liquor in the aeration tank and affecting the purification effect.

[0032] The lifting pump room is often called the sewage lifting pump room in the sewage treatment system. Its main function is to lift the upstream water to the height required by the subsequent treatment unit so that it can flow by gravity. Its working characteristics are that the water it pumps is not clean and generally contains a lot of impurities, and the flow rate of the water is changing at any time.

[0033] High-efficiency sedimentation tank (high-density sedimentation tank) is a kind of equipment that uses the principle of gravity sedimentation to separate solids and liquids. It is mainly used in the field of water treatment and has the characteristics of efficient removal of suspended matter and impurities. Its core principle is to accelerate the growth and precipitation of flocs by using the adsorption effect of high-density insoluble medium particles through carrier flocculation technology.

[0034] In implementation, the multi-mode sewage treatment system includes: Mode 1, through the operation mode of high-efficiency sedimentation tanks, deep bed filters, and oxidation tanks, SS, TP, TN, chroma and some ECs in sewage are removed;

[0035] Mode 2, through the operation mode of high-efficiency sedimentation tank, deep bed filter, oxidation tank, SS, TP, TN, chromaticity, and difficult-to-degrade organic matter and ECs are removed. After the removal operation, the content of difficult-to-degrade organic matter in the sewage is less than the first preset value, and the content of ECs in the sewage is less than the second preset value;

[0036] Mode 3, through the operation mode of high-efficiency sedimentation tank, oxidation tank and biological filter, SS, TP, chromaticity and a small amount of TN are removed, and difficult-to-degrade organic matter and ECs are removed. After the removal operation, the content of difficult-to-degrade organic matter in the sewage is less than the third preset value, and the content of ECs in the sewage is less than the fourth preset value; the first preset value is greater than the third preset value, and the second preset value is greater than the fourth preset value.

[0037] This technical feature covers the operation and effect of the sewage treatment system in different modes, which is mainly reflected in the removal efficiency of pollutants in sewage. Each mode has clear regulations on the removal degree of different pollutants in sewage (such as SS, TP, TN, chromaticity, refractory organic matter and ECs) and the concentration control after removal. The details are as follows:

[0038] Mode 1: Through the cooperation of high-efficiency sedimentation tanks, deep bed filters and oxidation tanks, it mainly removes suspended solids (SS), total phosphorus (TP), total nitrogen (TN), chromaticity and some environmental pollutants (ECs) in sewage. This mode is suitable for removing basic solid pollutants and chromaticity in water to ensure that the water quality is better purified.

[0039] Mode 2: In addition to the pollutants in Mode 1, it also removes refractory organic matter and ECs to ensure that the content of refractory organic matter in the sewage is less than the first preset value, and the content of ECs is less than the second preset value. This mode is suitable for removing more complex pollutants, especially refractory organic matter, to achieve higher pollutant removal standards, and ensure that the water quality after sewage treatment reaches higher environmental protection standards.

[0040] Mode 3: This mode removes SS, TP, chromaticity and a small amount of TN, and removes difficult-to-degrade organic matter and ECs through the cooperation of high-efficiency sedimentation tanks, oxidation tanks, and biological filters, ensuring that the content of difficult-to-degrade organic matter in sewage is less than the third preset value, and the content of ECs is less than the fourth preset value. This mode focuses more on removing biological difficult-to-degrade pollutants and is suitable for treatment scenarios with higher requirements for water quality, especially in the removal of difficult-to-degrade organic matter and ECs.

[0041] In this embodiment, different technical effects are achieved by setting different preset values. For example, the first preset value is greater than the third preset value, and the second preset value is greater than the fourth preset value, which means that in different modes, the requirements for removal effect will gradually increase, further enhancing the depth and breadth of sewage treatment. These different modes adopt a variety of combinations according to the different needs of water pollution, which are suitable for the treatment of different types of sewage, especially for the removal of difficult-to-degrade organic matter and ECs, providing a multi-level and multi-angle treatment solution for the sewage treatment system.

[0042] As a preferred implementation, the parameters of modes 1, 2, and 3 are different, mainly reflected in the oxidation tank, and other changes are not significant. The bacterial species of the deep bed filter in modes 1 and 2 are the same, and the bacterial species in mode 3 change; the deep bed filter adjusts the dominant microbial population of the filler in modes 1 and 3. In this implementation, the effect and adjustment method of the deep bed filter in different operating modes of the sewage treatment system, especially its operational differences in mode 1 and mode 3 and the regulation of the microbial population of the filler. The details are as follows:

[0043] 1. Differences in operating parameters of deep bed filters. The operating parameters of deep bed filters are different in Mode 1 and Mode 3, which means that in these two modes, the working state, flow rate, filtration intensity or other key operating parameters of the deep bed filter (such as hydraulic load, filtration rate, etc.) will be adjusted according to different sewage treatment needs. This adjustment can help the system optimize the filtration effect in different modes, especially in the removal efficiency of pollutants in sewage. Mode 1 mainly deals with simpler pollutants, such as suspended solids (SS) and chromaticity, while Mode 3 needs to deal with more complex pollutants, such as difficult-to-degrade organic matter and ECs. Therefore, the deep bed filter may require stronger filtration capacity or different operating conditions in Mode 3 to adapt to more complex water quality requirements.

[0044] 2. Adjustment of the microbial population of the filler. The deep bed filter not only relies on physical filtration, but also relies on the microbial community on the surface of the filler for biodegradation. In Mode 1 and Mode 3, the treatment capacity for different pollutants can be improved by adjusting the dominant microbial population on the filler. The microbial population in Mode 1 may tend to treat more basic pollutants (such as total nitrogen TN), while Mode 3 requires adjustment of the microbial community to effectively decompose difficult-to-degrade organic matter and other complex pollutants. This adjustment can ensure that the deep bed filter has higher treatment efficiency in different modes, especially in removing organic pollutants and difficult-to-degrade substances, thereby improving the effect of sewage treatment.

[0045] By adjusting the operating parameters of the deep bed filter in different modes and optimizing the microbial population, the sewage treatment system can remove different pollutants more effectively. Different modes in multiple modes mainly remove different target pollutants. Specifically, mode 1 mainly removes TN, while mode 3 mainly removes organic matter and ECs. Mode 3 also has a small removal effect on TN.

[0046] This preferred embodiment reflects the efficient operation of the sewage treatment system in different modes. The deep bed filter effectively improves the removal efficiency of pollutants in sewage by adjusting the operating parameters and microbial population, ensuring that different types of sewage treatment needs are met, especially for complex pollutants.

[0047] As another preferred embodiment, in Mode 1 and Mode 2, the deep bed filter is used as a denitrification filter, the microorganisms on the filler include: denitrifying bacteria, and the operating parameters are used to remove TN. In Mode 3, the deep bed filter is converted to a biological filter, the microorganisms on the filler include: bacterial communities for degrading difficult-to-degrade organic matter and new pollutants, and the operating parameters are used to remove difficult-to-degrade organic matter and new pollutants. In this embodiment, different ways of using the deep bed filter, the role of the microbial community and its effect on pollutant removal are recorded. The details are as follows:

[0048] 1. Use of deep bed filters in Modes 1 and 2. In Modes 1 and 2, the deep bed filter is used as a denitrification filter to remove total nitrogen (TN) from sewage. At this time, the operating parameters of the deep bed filter are mainly adjusted to optimize the denitrification process, and the microbial community on the filler includes denitrifying bacteria. Denitrifying bacteria help remove total nitrogen (TN) from sewage by reducing nitrates to nitrogen gas. Therefore, the role of the deep bed filter in Mode 1 is to remove the nitrogen source through biochemical reactions to ensure that the water quality meets the relevant emission standards. Through the denitrification process, the deep bed filter helps to reduce the nitrogen content in the water, thereby improving the water quality.

[0049] 2. The use of deep bed filters in Mode 3. In Mode 3, the deep bed filters are converted to biofilters, and the microbial community on the filler changes, mainly including microorganisms that can degrade difficult-to-degrade organic matter and new pollutants. In this mode, the operating parameters and microbial community of the deep bed filter are optimized to remove difficult-to-degrade organic matter and other new pollutants (such as endocrine disruptors). The adjustment of the microbial community enables the biofilter to effectively remove these difficult-to-treat pollutants through biodegradation. Compared with the denitrification function in Mode 1, the biofilter in Mode 3 focuses on the degradation of organic pollutants and new pollutants, further improving the depth of sewage treatment.

[0050] Through the above preferred implementation, in mode 1, the deep bed filter removes total nitrogen (TN) from sewage by denitrification, and ensures the dominance of denitrifying bacteria by adjusting the microorganisms, thereby efficiently completing the nitrogen removal task. The adjustment of the operating parameters adapts it to this specific function. In mode 3, the deep bed filter is used as a biological filter, and the microbial community on the filler is adjusted to a bacterial community that is more suitable for degrading difficult-to-degrade organic matter and new pollutants. This enables the deep bed filter to effectively treat more complex pollutants in the water and provide a deeper sewage purification effect.

[0051] The use of deep bed filters in different modes varies significantly, and they are optimized for the removal of different pollutants (total nitrogen, refractory organic matter, and new pollutants). By adjusting the operating parameters and microbial communities, deep bed filters can provide efficient treatment effects in each mode, ensuring that pollutants in sewage are removed in a targeted manner, thereby meeting water quality standards.

[0052] As another preferred embodiment, the operating parameters of the oxidation pond are adjusted when the oxidation pond is in mode 1, mode 2 and mode 3. In this preferred embodiment, the operating parameters of the oxidation pond in different modes are adjusted and their effects on the sewage treatment effect are as follows:

[0053] Adjustment of oxidation ponds in Mode 1, Mode 2 and Mode 3. In Mode 1, Mode 2 and Mode 3, the operating parameters of the oxidation pond will be adjusted according to the needs of different modes. The main function of the oxidation pond is to remove organic matter and certain pollutants in sewage through oxidation reactions, such as total nitrogen (TN) and recalcitrant organic matter. In different modes, the adjustment of the oxidation pond includes parameters such as ozone supply, UV dose, and hydrogen peroxide dosage, which have an important impact on the efficiency of the oxidation process and the removal of pollutants in sewage. By adjusting the operating parameters of the oxidation pond, a more efficient oxidation reaction can be achieved and the removal of pollutants in sewage can be optimized. In Mode 1, the oxidation pond may focus more on the removal of total nitrogen and chromaticity; in Mode 2, the oxidation pond needs to deal with more complex pollutants, including recalcitrant organic matter and environmental pollutants; in Mode 3, the adjustment of the oxidation pond can enhance the ability to remove recalcitrant organic matter and new pollutants, ensuring that the water quality reaches higher standards.

[0054] In addition, Mode 1: The oxidation pond mainly helps remove other basic pollutants (such as chromaticity) in sewage by adjusting parameters such as the ozone supply to ensure that the water quality is initially purified. Mode 2: The adjustment of the oxidation pond focuses more on removing complex pollutants, especially difficult-to-degrade organic matter and ECs. By optimizing the operating conditions of the oxidation reaction, the oxidation pond can efficiently degrade these pollutants and further improve the sewage treatment effect. Mode 3: In this mode, the optimization adjustment of the oxidation pond enables it to effectively remove difficult-to-degrade organic matter and new pollutants, and enhance the depth of sewage treatment. In particular, the oxidation pond plays an important role in treating pollutants that are more difficult to decompose.

[0055] By adjusting the operating parameters of the oxidation pond in different modes, its oxidation capacity can be optimized according to the specific needs of sewage treatment. This flexible adjustment ensures that the oxidation pond can provide efficient treatment effects for different types of pollutants, especially difficult-to-degrade organic matter and ECs.

[0056] By adjusting the operating parameters of the oxidation pond, the efficiency of sewage treatment can be improved, especially in the treatment of difficult-to-degrade organic matter and other complex pollutants. The adjustment of oxidation ponds in different modes ensures that the sewage treatment system can cope with different water quality requirements, further improving the overall treatment effect.

[0057] As another preferred embodiment, in mode 1, the ozone dosing concentration of the oxidation pond is a first concentration, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned off to remove chromaticity; in modes 2 and 3, the ozone dosing concentration of the oxidation pond is a second concentration, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned on to remove difficult-to-degrade organic matter and new pollutants; wherein the first concentration is less than the second concentration. This preferred embodiment emphasizes the use and adjustment of the ozone dosing concentration, ultraviolet irradiation system, and hydrogen peroxide dosing system in the oxidation pond in different modes, especially for the removal effect of different pollutants. Specifically as follows:

[0058] 1. Use of oxidation pond in mode 1. In mode 1, the ozone dosage concentration of the oxidation pond is set to the first concentration, and the UV irradiation system and hydrogen peroxide dosage system are turned off. This setting is mainly used to remove color from sewage. The first lower concentration of ozone helps to remove color from the water without the need for additional UV irradiation and hydrogen peroxide dosage systems. Ozone has a strong oxidizing effect and can decompose colored substances in the water, thereby effectively improving the appearance of the water. Since mode 1 deals with organic matter (or color) that is easily degraded and removed, the ozone dosage concentration is set relatively low to avoid over-treatment and reduce additional energy consumption and chemical use.

[0059] 2. The use of oxidation ponds in Mode 2 and Mode 3. In Mode 2 and Mode 3, the ozone concentration of the oxidation pond is increased to the second concentration, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned on at the same time. These adjustments are mainly used to remove difficult-to-degrade organic matter and new pollutants. The second higher concentration of ozone can effectively decompose more complex pollutants, such as difficult-to-degrade organic matter and new pollutants. The purpose of turning on the ultraviolet irradiation and hydrogen peroxide dosing system is to enhance the oxidation effect, especially when dealing with difficult-to-degrade pollutants. The combination of ultraviolet rays and hydrogen peroxide can activate more free radicals and accelerate the degradation and mineralization process of organic matter. Through the combined use of these multiple oxidation methods, the oxidation pond in Mode 2 and Mode 3 can provide stronger decontamination capabilities and ensure that the treatment effect reaches a higher standard.

[0060] It should be noted that in Mode 1, the ozone concentration is low, the UV irradiation and hydrogen peroxide systems are turned off, and it mainly deals with more basic pollutants (such as color). This configuration can effectively remove color from the water, avoid over-treatment, and is more energy-efficient. In Modes 2 and 3, the ozone concentration is higher, the UV irradiation and hydrogen peroxide dosing systems are turned on, and they mainly deal with more complex and difficult-to-degrade pollutants. This setting significantly improves the treatment effect of the oxidation pond, especially in removing difficult-to-degrade organic matter and new pollutants.

[0061] By adjusting the ozone concentration, UV irradiation system and hydrogen peroxide dosing system, it is possible to provide precise oxidation treatment for different pollutants in different modes. Mode 1 is suitable for treating simple pollutants such as chromaticity, while Mode 2 and Mode 3 are designed with optimized oxidation solutions for more complex pollutants, ensuring the depth and efficiency of sewage treatment.

[0062] Preferably, the oxidation pond comprises: an ozone dosing system, an ultraviolet irradiation system and a hydrogen peroxide dosing system. The technical features and technical effects of the oxidation pond in this embodiment are mainly reflected in the integration and coordination of the ozone dosing system, the ultraviolet irradiation system and the hydrogen peroxide dosing system. The analysis is as follows:

[0063] 1. Ozone dosing system. Ozone is a strong oxidant that can quickly degrade organic matter in water, especially remove color and some difficult-to-degrade organic pollutants. In the oxidation tank, the ozone dosing system is used to add ozone to the sewage to promote the oxidation reaction. Ozone can destroy the chemical structure of pollutants by reacting with them, decompose harmful organic matter in water, and improve water quality. Its main function is to remove color and certain organic pollutants in sewage. The concentration of ozone varies in different modes to meet different treatment needs.

[0064] 2. Ultraviolet irradiation system. Ultraviolet (UV) irradiation systems are used to promote oxidation reactions through ultraviolet radiation, and are generally used to kill microorganisms and decompose pollutants in water. UV systems can enhance the oxidative effect of ozone, especially when dealing with difficult-to-degrade organic matter and new pollutants. Ultraviolet rays accelerate chemical reactions by generating free radicals, thereby enhancing the ability to remove organic matter and pollutants.

[0065] 3. Hydrogen peroxide dosing system. Hydrogen peroxide (H2O2), as an oxidant, can be combined with ultraviolet rays and ozone to further improve the efficiency of the oxidation reaction. Adding hydrogen peroxide to the oxidation tank can generate a large number of free radicals (such as OH free radicals), which have extremely strong oxidizing ability and can effectively degrade difficult-to-degrade organic matter. The addition of hydrogen peroxide, combined with the effects of ultraviolet rays and ozone, enhances the oxidative degradation effect in sewage treatment, especially when dealing with complex pollutants, and has a significant effect.

[0066] In this embodiment, the ozone dosing system, ultraviolet irradiation system and hydrogen peroxide dosing system of the oxidation pond work together to ensure that under different treatment modes, the oxidation pond can efficiently remove complex pollutants such as chromaticity, difficult-to-degrade organic matter, and new pollutants in sewage. In different modes, by adjusting the working status of these systems, the oxidation pond can provide precise oxidation treatment for different pollutants: in mode 1, the concentration of ozone is low, mainly used to remove chromaticity, and the ultraviolet and hydrogen peroxide systems are turned off, ensuring a relatively basic treatment effect. In modes 2 and 3, the ozone concentration is high, and the ultraviolet and hydrogen peroxide systems are turned on, which enhances the ability to treat complex pollutants (such as difficult-to-degrade organic matter and new pollutants) and significantly improves the water purification effect.

[0067] By integrating ozone dosing, UV irradiation and hydrogen peroxide dosing systems, the oxidation pond can provide multiple oxidation pathways and enhance the removal capacity of different pollutants. Adjustment in different modes ensures that the system can adapt to different sewage treatment needs, improving the efficiency of sewage treatment and water purification effect.

[0068] Preferably, the lifting pump room adopts variable frequency control, and the flow rate and head of the lifting pump are automatically adjusted according to the inlet water volume and water quality. In this embodiment, the variable frequency control technology can automatically adjust the flow rate and head of the water pump according to the changes in the inlet water volume and water quality, so that the sewage treatment system can flexibly respond to different operating conditions and maintain the stability and efficiency of the system. For example, when the water volume is large or the water quality is poor, the water pump can automatically increase the flow rate to ensure the smooth progress of the treatment process; when the water volume is small or the water quality is good, the system will automatically reduce energy consumption to avoid waste. In addition, energy saving and consumption reduction can be achieved. Variable frequency control can accurately adjust the working state of the water pump, avoiding excessive energy consumption during the operation of traditional fixed speed pumps. By adjusting the power of the water pump according to actual needs, the system can greatly reduce energy waste while ensuring the stability of the water flow, thereby reducing operating costs and achieving energy saving effects. Secondly, the operating stability of the pump room equipment can be improved. Automatically adjusting the flow rate of the water pump can avoid the operating state of overload or underload, thereby reducing the loss and failure risk of mechanical equipment. The equipment can operate under optimal conditions, extend its service life, and reduce the downtime maintenance costs caused by equipment failure.

[0069] Frequency conversion control technology can improve the adaptability, energy saving and stability of the system while ensuring the sewage treatment effect, thereby improving the operating efficiency of the entire sewage treatment process, reducing energy consumption and extending equipment life.

[0070] Preferably, the ozone dosing system, ultraviolet irradiation system and hydrogen peroxide dosing system of the oxidation tank are automatically controlled by PLC and automatically adjusted according to the influent water quality and operation mode. The ozone dosing system, ultraviolet irradiation system and hydrogen peroxide dosing system of the oxidation tank are automatically controlled by PLC (programmable logic controller), and the technical characteristics of automatic adjustment according to the influent water quality and operation mode have the following technical effects: improve the automation and flexibility of system operation. Through PLC automatic control, the system can be adjusted in real time according to the actual influent water quality and the selected operation mode without manual intervention. This intelligent control method improves the automation level of the sewage treatment system, enables the equipment to automatically respond to changes according to different treatment requirements, and improves the efficiency and accuracy of operation. Optimize the dosage of reagents and process control. This technology can accurately adjust the dosage of ozone, ultraviolet rays and hydrogen peroxide according to the changes in the water quality of the influent (such as the concentration of pollutants such as COD, chromaticity, difficult-to-degrade organic matter, ECs in water), thereby ensuring that each treatment link can work efficiently, avoiding the waste of reagents, and improving the removal effect of pollutants. It can save energy and reduce operating costs. The automatic control system can accurately control the ozone concentration and other treatment parameters without manual adjustment, ensuring the best treatment effect in different operation modes. This reduces energy consumption, especially when the sewage quality is good, the dosage of ozone and other oxidants can be reduced, thereby saving operating costs. In addition, the stability of the treatment effect can be improved. Automatic regulation can effectively cope with the fluctuation of sewage quality, especially when facing different types of pollutants (such as SS, TP, TN, ECs, etc.), and the treatment process can be flexibly adjusted to maintain the stability and compliance of the effluent quality. This helps the sewage treatment plant maintain stable operation when dealing with different seasons, weather or emergencies. Secondly, mode switching and flexible adaptation can be achieved: Since the system can adjust the dosage of ozone, ultraviolet light and hydrogen peroxide according to different operation modes (such as mode 1, mode 2 and mode 3), it can achieve flexible switching under different treatment goals. For example, when it is necessary to enhance the removal of difficult-to-degrade organic matter or ECs, the PLC system will automatically increase the dosage of oxidants to ensure better removal effect, while avoiding excessive dosage of agents when it is not needed. Finally, the response speed and reliability of the system can be optimized. The PLC control system can respond to water quality changes in real time and quickly adjust the oxidation tank dosing system operation, avoiding the delay of manual adjustment, thus ensuring the system's response speed and treatment efficiency. This efficient control method enhances the reliability of sewage treatment and reduces errors and uncertainties in human operation.

[0071] In this embodiment, the use of PLC automatic control technology not only improves the intelligence, automation and flexibility of the entire sewage deep treatment system, but also effectively saves resources and reduces costs, while ensuring the stability of the treatment effect and optimized operation.

[0072] Preferably, the monitoring parameters of the online monitoring system and the online detection system include inlet water quality, outlet water quality, ozone dosage, ultraviolet irradiation intensity, and hydrogen peroxide dosage, and the monitoring data are transmitted wirelessly to the central control room. The technical features of the online monitoring system including inlet water quality, outlet water quality, ozone dosage, ultraviolet irradiation intensity, and hydrogen peroxide dosage, and transmitting the monitoring data to the central control room via wireless transmission have the following technical effects: (1) Real-time monitoring and data feedback: Through the online monitoring system, key parameters in the sewage treatment process (such as inlet and outlet water quality, oxidant dosage, etc.) can be monitored in real time to ensure that the treatment process can be accurately controlled under different operating modes. These real-time data are transmitted to the central control room wirelessly, so that technicians can track the treatment effect at any time and make corresponding adjustments based on the data. (2) Improve management efficiency and decision support: The monitoring data are transmitted wirelessly to the central control room, which can realize remote management and centralized control. This method not only allows managers to master the sewage treatment process more efficiently, but also helps technicians quickly discover problems and make effective interventions, avoiding the lag and inaccuracy that may occur in traditional manual inspections. (3) Enhance the transparency and traceability of system operation: The real-time data transmitted wirelessly provides a transparent monitoring record for each link of sewage treatment. These data can be used as the basis for system operation, which helps to improve the traceability of the entire process and facilitate future analysis and review. In particular, when problems arise, the data can serve as the basis for problem analysis and troubleshooting. (4) Optimize resource allocation and operational efficiency: Based on the data of the online monitoring system, operators can accurately grasp the specific changes in the treatment process and adjust the dosage of ozone, ultraviolet light and hydrogen peroxide in a timely manner to avoid unnecessary waste. At the same time, energy use and chemical addition can be optimized to ensure that resource consumption is minimized while maintaining efficient treatment. (5) Improve the flexibility and adaptability of the system: The online monitoring system can reflect the changes in the influent water quality in real time, thereby helping the system to quickly adjust the treatment parameters according to the actual situation, especially in the case of different types of pollutants or emergencies. The system can respond flexibly. The transmission of data to the central control room also enables water treatment plants in different regions to share experiences or take similar response measures, thereby improving overall treatment capabilities. (6) Improve the stability and compliance of the system: Real-time feedback of monitoring data can help ensure that the water treatment process always meets relevant emission standards. Through real-time data transmitted wirelessly, the central control room can quickly detect abnormal effluent water quality or problems in the treatment process, and take timely measures to ensure that the sewage treatment plant can operate stably and in compliance with regulations.

[0073] In this embodiment, the design of the online monitoring system not only provides precise control of the sewage treatment process, but also improves management efficiency, system adaptability and transparency, while also providing support for energy saving and consumption reduction and improving treatment effects.

[0074] The present embodiment provides a mode-switchable sewage treatment system (sewage treatment system), which may include: a high-efficiency sedimentation tank, a lift pump room, a deep bed filter, an oxidation tank (advanced oxidation tank), and a connecting pipe system. During the implementation process, the high-efficiency sedimentation tank is arranged after the traditional secondary treatment and before the lift pump room to remove SS and TP. The lift pump room is used to ensure the hydraulic smoothness of the treatment process. The deep bed filter can be used to remove TN and ECs. In actual operation, it can be located upstream or downstream of the advanced oxidation tank according to different operating objectives. The advanced oxidation tank (oxidation tank) can remove chroma, difficult-to-degrade organic matter and ECs. The connecting pipe system is used to transport water.

[0075] In this embodiment, a mode-switchable sewage treatment system is provided, which can achieve multiple deep treatment operation targets by switching gates and changing the dosage of added chemicals.

[0076] In this embodiment, the operation modes of the sewage treatment system may include:

[0077] Mode 1, which uses the operation mode of high-efficiency sedimentation tank, deep bed filter and oxygen oxidation tank, can achieve the removal of SS, TP, TN, chromaticity and part of ECs.

[0078] Mode 2, which uses the operating mode of high-efficiency sedimentation tanks, deep bed filters and oxidation tanks (advanced oxidation tanks), can achieve the removal of SS, TP, TN, and chromaticity, and further enhance the removal of difficult-to-degrade organic matter and ECs.

[0079] Mode 3, which uses the operating mode of high-efficiency sedimentation tank, oxidation tank (advanced oxidation tank) and biological filter, can achieve the removal of SS, TP, chromaticity and a small amount of TN, and achieve the ultimate removal of difficult-to-degrade organic matter and ECs.

[0080] During implementation, the gates of the treatment facility can adjust the direction of water flow by opening and closing, thereby achieving operating mode switching.

[0081] Preferably, the oxidation pond (advanced oxidation pond) may include an ozone dosing system, an ultraviolet irradiation system and a hydrogen peroxide dosing system.

[0082] During the implementation process, the operating parameters of the deep bed filter and the dominant microbial population on the filler will be adjusted accordingly in mode 1 (with the removal of TN as the main goal) and mode 3 (with the removal of difficult-to-degrade organic matter or ECs as the main goal).

[0083] Preferably, the operating parameters of the advanced oxidation tank in mode 1 (with the removal of chroma as the main goal) and mode 2 and mode 3 (with the removal of refractory organic matter or ECs as the main goal) need to be adjusted accordingly.

[0084] This embodiment provides a mode-switchable sewage treatment system. In this embodiment, the system can be switched among Mode 1, Mode 2 and Mode 3. Mode 1, Mode 2 and Mode 3 are described below respectively.

[0085] Figure 1 1 is a schematic diagram of mode 1 operation according to an embodiment of the present invention. Figure 1 As shown, the mode 1 operation is described.

[0086] Normally, mode 1 can be used. After the effluent from the secondary sedimentation tank enters the high-efficiency sedimentation tank to treat SS and TP, the effluent enters the subsequent treatment unit. Gates 1, 3, 6, 7, and 9 are open, and gates 2, 4, 5, 8, and 10 are closed. The effluent is first lifted to the deep bed filter tank to remove TN through the lifting pump room, and then enters the ozone oxidation tank. The ozone addition concentration is generally not more than 10 mg / L. The ultraviolet irradiation system and hydrogen peroxide addition system are mainly used to remove chromaticity. The effluent enters the disinfection tank for disinfection.

[0087] Figure 2 2 is a schematic diagram of mode 2 operation according to an embodiment of the present invention. Figure 2 As shown, the mode 2 operation is described.

[0088] Gates 1, 3, 6, 7, and 9 are open, and gates 2, 4, 5, 8, and 10 are closed. The effluent from the secondary sedimentation tank enters the high-efficiency sedimentation tank to treat SS and TP, and is then lifted to the deep bed filter to remove TN through the lifting pump room, and then enters the advanced oxidation tank. The ozone addition concentration is generally not more than 20 mg / L, and the ozone is added at a ratio of 2:1 according to the concentration of difficult-to-degrade COD to be removed. The ultraviolet irradiation system and hydrogen peroxide addition system are turned on to strengthen the removal of difficult-to-degrade organic matter or ECs, and the effluent enters the disinfection tank for disinfection.

[0089] Figure 3 3 is a schematic diagram of mode 3 operation provided according to an embodiment of the present invention. Figure 3 As shown, the mode 3 operation is described.

[0090] Gates 2, 4, 5, 8, and 10 are open, and gates 1, 3, 6, 7, and 9 are closed. After the effluent from the secondary sedimentation tank enters the high-efficiency sedimentation tank to treat SS and TP, the effluent flows into the advanced oxidation tank by gravity. The ozone addition concentration is generally not more than 20 mg / L. It is added at a ratio of 2:1 according to the concentration of difficult-to-degrade COD to be removed. The ultraviolet irradiation system and hydrogen peroxide addition system are turned on to strengthen the removal of difficult-to-degrade organic matter or ECs and improve the biodegradability of pollutants. The effluent is lifted by the lifting pump room and enters the biofilter. The biofilter uses microorganisms to further remove the biodegradable organic matter and ECs that have become biodegradable after advanced oxidation. The effluent enters the disinfection tank for disinfection.

[0091] Through the above embodiments, a mode-switchable sewage treatment system is provided, which has a wide range of uses and can be widely used in various sewage treatment plants and recycled water plants, and can achieve the following technical effects.

[0092] (1) The mode-switchable sewage treatment system provided in this application is operated in mode 1 under normal circumstances. The ozone concentration of the advanced oxidation tank is kept at a low level, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned off. It is used as a common ozone oxidation tank, mainly used to reduce the chromaticity of the effluent, and has no effect on the removal of TN by the denitrification filter. This mode has the lowest operating cost and can meet the application needs of most sewage treatment plants or reclaimed water plants.

[0093] (2) The mode-switchable sewage treatment system provided in the present application can be switched to mode 2 when it is necessary to enhance the removal of difficult-to-degrade organic matter or ECs. The effluent COD can be reduced to below 20 mg / L, and the removal rate of EC is above 80%. Advanced oxidation has no effect on the removal of TN by the denitrification filter.

[0094] (3) The mode-switchable sewage treatment system provided in this application can be switched to mode 3 when the secondary treatment has basically completed the removal of TN and the operating pressure of treating difficult-to-degrade organic matter or ECs is high. This mode is better than mode 2 in removing difficult-to-degrade organic matter or ECs, but the deep bed filter is converted into a biological filter, which affects the removal of TN by denitrification and can only remove a small amount of TN.

[0095] In summary, by setting up high-efficiency sedimentation tanks, deep bed filters and advanced oxidation tanks, and combining the gate switching of the connecting pipelines, the multi-mode operation of the sewage treatment system is realized. The system can flexibly switch the operation mode according to different treatment requirements, thereby reducing the operating cost while ensuring the water quality of the effluent. This application not only improves the shock load resistance of the sewage system, but also enhances the removal effect of different pollutants, especially the removal ability of new pollutants (ECs), meeting the increasingly stringent sewage treatment standards.

[0096] The following examples are only examples for clearly illustrating 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 can 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.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sewage treatment system, characterized in that: include: High-efficiency sedimentation tank, lift pump house, deep bed filter, oxidation tank and connecting pipe system; The high-efficiency sedimentation tank is arranged between the secondary sedimentation tank and the lift pump room, and is used to remove suspended solids SS and total phosphorus TP in the sewage; The lifting pump room is used to ensure the hydraulic smoothness of the sewage in the sewage treatment process of the sewage treatment system; The deep bed filter is used to remove total nitrogen TN and new pollutants ECs from the sewage, and the deep bed filter is located upstream or downstream of the oxidation tank; The oxidation pond is used to remove chromaticity, refractory organic matter and ECs in the sewage water; The connecting pipeline is used for conveying the water flow of sewage in the sewage treatment system, and the switching between multiple operation modes of the sewage system is achieved by opening and closing the gate of the connecting pipeline.

2. The sewage treatment system according to claim 1, characterized in that: The multi-mode sewage treatment system includes: Mode 1, through the operation mode of the high-efficiency sedimentation tank, the deep bed filter, and the oxidation tank, the SS, the TP, the TN, the chromaticity and part of the ECs in the sewage are removed; Mode 2, through the operation mode of the high-efficiency sedimentation tank, the deep bed filter, and the oxidation tank, the SS, the TP, the TN, the chromaticity, and the difficult-to-degrade organic matter and the ECs are removed. After the removal operation, the content of the difficult-to-degrade organic matter in the sewage is less than a first preset value, and the content of the ECs in the sewage is less than a second preset value; Mode 3, through the operation mode of the high-efficiency sedimentation tank, the oxidation tank, and the biological filter, the SS, the TP, the chromaticity and a small amount of TN are removed, and the difficult-to-degrade organic matter and the ECs are removed, wherein after the removal operation, the content of the difficult-to-degrade organic matter in the sewage is less than a third preset value, and the content of the ECs in the sewage is less than a fourth preset value; The first preset value is greater than the third preset value, and the second preset value is greater than the fourth preset value.

3. The sewage treatment system according to claim 2, characterized in that: The operating parameters of the deep bed filter in Mode 1 and Mode 3 are different; When the deep bed filter is in Mode 1 and Mode 3, the dominant microbial population of the filler is adjusted.

4. The sewage treatment system according to claim 3, characterized in that: In the mode 1 and the mode 2, the deep bed filter is used as a denitrification filter, the microorganisms on the filler include: denitrifying bacteria, and the operating parameters are used to remove the TN; In Mode 3, the deep bed filter is converted to a biological filter, the microorganisms on the filler include: a bacterial community for degrading the difficult-to-degrade organic matter and the new pollutants, and the operating parameters are used to remove the difficult-to-degrade organic matter and the new pollutants.

5. The sewage treatment system according to claim 2, characterized in that: When the oxidation pool is in mode 1, mode 2, and mode 3, the operating parameters of the oxidation pool are adjusted.

6. The sewage treatment system according to claim 5, characterized in that: In the mode 1, the ozone dosing concentration of the oxidation tank is a first concentration, and the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned off to remove the chromaticity; In the modes 2 and 3, the ozone dosing concentration of the oxidation pond is the second concentration, the ultraviolet irradiation system and the hydrogen peroxide dosing system are turned on to remove the refractory organic matter and the new pollutants; Wherein, the first concentration is less than the second concentration.

7. The sewage treatment system according to any one of claims 1 to 6, characterized in that: The oxidation pool comprises: an ozone dosing system, an ultraviolet irradiation system and a hydrogen peroxide dosing system.

8. The sewage treatment system according to any one of claims 1 to 6, characterized in that: The lifting pump room adopts frequency conversion control, and the flow rate and lift of the lifting water pump are automatically adjusted according to the water volume and water quality.

9. The sewage treatment system according to any one of claims 1 to 6, characterized in that: The ozone dosing system, ultraviolet irradiation system and hydrogen peroxide dosing system of the oxidation pond are automatically controlled by PLC and automatically adjusted according to the influent water quality and the operation mode.

10. The sewage treatment system according to any one of claims 1 to 6, characterized in that: Also includes: Online monitoring system, the monitoring parameters of the online detection system include inlet water quality, outlet water quality, ozone dosage, ultraviolet irradiation intensity, and hydrogen peroxide dosage. The monitoring data is transmitted wirelessly to the central control room.

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