Composite and efficient treatment system based on activated carbon and its application in water treatment

Abstract

The invention relates to a composite high-efficiency treatment system based on activated carbon, comprising: mutually coupled ozone double-layer activated carbon filter bed unit and mobile powder carbon multi-point dosing unit; the ozone double-layer activated carbon filter bed unit comprises a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon with developed macropores; the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon with developed mesopores; the mobile powder carbon multi-point dosing unit comprises a mesopore powder activated carbon dosing channel, a small pore powder activated carbon dosing channel, a control device and a dosing device; the controller determines the powder activated carbon dosing channel to be started, the dosing type, quantity and dosing time of activated carbon powder according to the real-time monitored water quality mutation situation; the dosing device performs automatic powder carbon multi-point dosing. Also disclosed is a water treatment system and a water treatment process method of the composite high-efficiency treatment system.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a composite high-efficiency treatment system based on activated carbon and application thereof in water treatment. Background Art

[0002] Ozone biological activated carbon technology is a commonly used deep treatment technology in drinking water treatment processes. The core functions of this technology are: first, to degrade some difficult-to-degrade organic matter through advanced oxidation of ozone, to completely mineralize it or to convert it from large molecules into small molecules that are easily absorbed and degraded by microorganisms; second, to adsorb organic matter and metal ions through the pore structure of activated carbon; third, to achieve biodegradation and absorption of organic matter and metal ions through the adsorption of microorganisms that reproduce on the macroporous channels of activated carbon.

[0003] At present, a large number of research and practices have proved that as the working time of the ozone activated carbon filter increases, the physical adsorption effect of the activated carbon filter decreases, while the biodegradation effect gradually increases with the growth of microorganisms; especially after the filter has been running for one year, as the carbon adsorption is saturated, the filter almost loses its activated carbon adsorption capacity, and only the microorganisms adsorbed on the macropore channels of the activated carbon continue to exert the corresponding biodegradation effect, which will lead to a decrease in the deep treatment efficiency of biological activated carbon pollutants and the inability to maximize efficiency for a long time.

[0004] In addition, after the activated carbon filter has been running for a period of time, when faced with sudden impacts of emerging pollutants and metal pollutants, the immediate adsorption and removal function will fail, and the characteristic microorganisms have not yet been domesticated and grown, and cannot play a biological absorption and degradation role in the short term, there will be a risk of sudden effluent water quality failing to meet standards. Summary of the invention

[0005] In order to solve at least one of the above technical problems, the present invention proposes a composite and efficient treatment system based on activated carbon and its application in water treatment. In view of the short-term failure of the adsorption capacity of activated carbon and the degradation effect of microorganisms accumulated on the activated carbon, a high-efficiency composite activated carbon deep treatment process (Multi-AC process) for deep treatment of tap water is designed. This process is innovatively improved on the basis of traditional processes, integrating multiple activated carbon deep treatment processes, and coupling the ozone double-layer activated carbon filter bed with a powdered carbon multi-point addition process, so as to continuously maintain the adsorption and biodegradation effects of the activated carbon, while responding to emergency risks in sudden situations.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a composite and efficient treatment system based on activated carbon, comprising:

[0008] Mutually coupled ozone double-layer activated carbon filter bed unit and mobile powder carbon multi-point dosing unit;

[0009] The ozone double-layer activated carbon filter bed unit comprises a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed macropores and the activity of the microbial membrane is maintained through the backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed mesopores;

[0010] The mobile powdered carbon multi-point dosing unit includes multiple powdered activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein, the multiple powdered activated carbon dosing channels for different pore sizes include medium-pore powdered activated carbon dosing channels and small-pore powdered activated carbon dosing channels; the controller determines control information based on real-time monitored water quality mutation conditions, and the control information includes the powdered activated carbon dosing channel to be started, the type, quantity and dosing time of activated carbon powder; the dosing device automatically performs multi-point dosing of powdered carbon according to the control information.

[0011] Preferably, the medium-pore size powdered activated carbon adding channel adds activated carbon powder with a pore size of 2-50 nm.

[0012] Preferably, the small-pore powdered activated carbon addition channel adds activated carbon powder with a pore size of less than 2 nm.

[0013] Preferably, the lower ozone double-layer activated carbon filter bed subunit is two-thirds of the overall height of the ozone double-layer activated carbon filter bed unit.

[0014] Preferably, the upper ozone double-layer activated carbon filter bed subunit is one third of the overall height of the ozone double-layer activated carbon filter bed unit.

[0015] The second aspect of the present invention provides a water treatment system based on the composite high-efficiency treatment system of the first aspect, comprising:

[0016] The raw water, water distribution well, pre-ozone contact tank, mixed flocculation sedimentation tank, sand filter, ozone double-layer activated carbon filter bed module and clean water tank are connected in sequence through pipelines. The clean water tank is connected to the water outlet and also includes a mobile powdered carbon multi-point dosing unit that is movable on the entire route from the raw water to the clean water tank.

[0017] Preferably, the ozone double-layer activated carbon filter bed module comprises the ozone double-layer activated carbon filter bed unit, a post-ozone contact tank, a biological activated carbon storage body and a fluidized granular activated carbon storage body.

[0018] Preferably, the post-ozone contact tank and the pre-ozone contact tank both include a gas-liquid mixer, a spiral blade pipeline mixer, an ozone contact oxidation tower and a contact oxidation tank.

[0019] The third aspect of the present invention is to provide a composite and efficient water treatment method based on activated carbon, comprising:

[0020] S1, setting an ozone double-layer activated carbon filter bed unit, including a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed macropores and the activity of the microbial membrane is maintained through backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed mesopores;

[0021] S2, constructing a mobile powder carbon multi-point dosing unit with automatic metering, automatic dosing and automatic alarm functions and coupling the mobile powder carbon multi-point dosing unit with the ozone double-layer activated carbon filter bed unit; the mobile powder carbon multi-point dosing unit includes a plurality of powder activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein the plurality of powder activated carbon dosing channels for different pore sizes include medium-pore powder activated carbon dosing channels and small-pore powder activated carbon dosing channels; the controller determines control information according to the real-time monitored water quality mutation situation, and the control information includes the powder activated carbon dosing channel to be started, the dosing type, quantity and dosing time of activated carbon powder; the dosing device performs automatic powder carbon multi-point dosing according to the control information;

[0022] S3, implement monitoring of sudden changes in water quality, determine the characteristic pollutants corresponding to the sudden changes in water quality, automatically open the powdered activated carbon addition channels for different pore sizes according to the molecular weight of the characteristic pollutants, and add the type of activated carbon with the maximum adsorption capacity for the characteristic pollutants; according to the type of pollutants, classify and set the best addition positions along the process line of the water purification facility, and automatically indicate the best addition position according to the type and concentration of pollutants when the water quality suddenly changes.

[0023] Preferably, the sudden change in water quality includes the appearance of organic, inorganic and / or heavy metal pollutants that do not appear under normal operation conditions.

[0024] Compared with the prior art, the ozone double-layer activated carbon filter bed coupled with the powdered carbon multi-point dosing system, process method and complete water treatment system provided by the present invention have the following beneficial effects:

[0025] 1. The characteristics of the ozone double-layer activated carbon filter bed unit are as follows:

[0026] In view of the space required for the aggregation, growth and enrichment of microorganisms, the lower layer (two-thirds of the entire filter layer) uses macroporous granular activated carbon with a pore size of more than 50nm. This layer of activated carbon removes pollutants by enriching a large number of microorganisms. During daily operation, the backwashing mode and intensity of lowering the water level-gas flushing-gas-water flushing-high-intensity water flushing are followed to maintain the activity of the microbial membrane and keep the biomass at 150-200nmol P / g.

[0027] In view of the fact that the upper activated carbon mainly removes pollutants through adsorption, the upper layer of the double activated carbon filter bed (one third of the total filter layer) uses granular activated carbon with well-developed mesopores and a pore size of 2-50nm. This layer of activated carbon has a strong adsorption capacity for large molecular substances and can adsorb and remove pollutants that are difficult to degrade by microorganisms. As the carbon adsorption capacity gradually becomes saturated, the mesopore particle size of the upper layer is tested during the operation of the filter bed, and new activated carbon is replaced every 2 years.

[0028] 2. The characteristics of the coupled mobile powder carbon multi-point dosing unit are as follows:

[0029] In case of sudden changes in water quality, when organic, inorganic or other heavy metal pollutants that do not appear under normal operation appear, a movable powder carbon dosing facility unit is constructed, which has functions such as automatic metering, automatic dosing and automatic alarm;

[0030] The facility has both medium-pore (2-50nm) powdered activated carbon dosing channels and small-pore (<2nm) powdered activated carbon dosing channels. When water quality suddenly changes, the adaptive activated carbon dosing channel is automatically opened according to the molecular weight of the characteristic pollutants, and the activated carbon type with the maximum adsorption capacity for the characteristic pollutants is added;

[0031] The facility can set the best dosing locations along the water purification facility process according to the types of pollutants. When the water quality suddenly changes, it can automatically indicate the best dosing location according to the type and concentration of pollutants.

[0032] 3. The process advantages of coupling the ozone activated carbon filter bed with the powdered activated carbon multi-point dosing unit are as follows:

[0033] (1) The mobile powder carbon dosing unit can be turned on and off instantly. During daily operation, only the ozone activated carbon filter unit needs to be turned on to ensure operation, saving economic costs. When responding to sudden changes in water quality, the two units can quickly complement each other. The mobile powder carbon unit can be turned on to enhance the deep processing capacity and simultaneously reduce the impact on the ozone double-layer activated carbon filter bed, thereby extending the activated carbon replacement cycle in the filter bed.

[0034] (2) The ozone double-layer activated carbon filter bed is constructed by combining the lower and upper layers of double-layer activated carbon filter media in a ratio of (2:1), which strengthens the dual barriers of biological degradation and long-term physical adsorption degradation of the activated carbon filter bed. In addition, the precise selection of macroporous activated carbon in the lower filter media greatly improves the biodegradability of the filter bed. The careful selection of medium-pore activated carbon filter media in the upper layer and its replacement and regeneration once every two years enable the activated carbon filter to be replaced in time after adsorption saturation, thereby continuously maintaining effective pollutant adsorption capacity in the pool.

[0035] (3) The mobile powdered activated carbon dosing process unit, through the reserve of dual-channel activated carbon and the setting of movable dosing mode, can effectively supplement the ozone double-layer activated carbon filter bed unit in the case of sudden changes in water quality. When the removal capacity of the filter section is insufficient, the powdered activated carbon can use its specific surface area to greatly improve the adsorption capacity of organic matter, inorganic matter and metal ions. First, during the construction stage, it can scientifically reduce the removal load requirements of the overall process for the ozone activated carbon filter, thereby reducing the design and construction costs; second, during the operation stage, it can ensure the operating capacity of the ozone activated carbon pool during the period of sudden changes in water quality, reduce the backwash intensity of the filter, and achieve cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the water treatment system architecture of a composite high-efficiency treatment system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention.

[0038] Embodiment 1

[0039] This embodiment provides a composite and efficient treatment system based on activated carbon, comprising:

[0040] Mutually coupled ozone double-layer activated carbon filter bed unit and mobile powder carbon multi-point dosing unit;

[0041] The ozone double-layer activated carbon filter bed unit comprises a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed macropores and the activity of the microbial membrane is maintained through the backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed mesopores;

[0042] The mobile powdered carbon multi-point dosing unit includes multiple powdered activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein, the multiple powdered activated carbon dosing channels for different pore sizes include medium-pore powdered activated carbon dosing channels and small-pore powdered activated carbon dosing channels; the controller determines control information based on real-time monitored water quality mutation conditions, and the control information includes the powdered activated carbon dosing channel to be started, the type, quantity and dosing time of activated carbon powder; the dosing device automatically performs multi-point dosing of powdered carbon according to the control information.

[0043] As a preferred embodiment, the medium-pore powder activated carbon addition channel adds activated carbon powder with a pore size of 2-50 nm.

[0044] As a preferred embodiment, the small-pore powdered activated carbon addition channel adds activated carbon powder with a pore size of less than 2 nm.

[0045] As a preferred embodiment, the lower ozone double-layer activated carbon filter bed subunit is two-thirds of the overall height of the ozone double-layer activated carbon filter bed unit.

[0046] As a preferred embodiment, the upper ozone double-layer activated carbon filter bed subunit is one third of the overall height of the ozone double-layer activated carbon filter bed unit.

[0047] Embodiment 2

[0048] like Figure 1 As shown, this embodiment provides a water treatment system based on the composite high-efficiency treatment system of the first aspect, comprising:

[0049] The raw water, water distribution well, pre-ozone contact tank, mixed flocculation sedimentation tank, sand filter, ozone double-layer activated carbon filter bed module ( Figure 1 Module 2) and a clear water tank, and also includes a mobile powder carbon multi-point dosing unit ( Figure 1 Module 1).

[0050] In this embodiment, the pre-ozone contact tank is used to implement ozone pre-oxidation. Ozone can oxidize and decompose some simple macromolecular organic matter in water, and at the same time oxidize organic matter that is difficult to biodegrade into small molecular organic matter, thereby improving its biodegradability and making it easier to be adsorbed by activated carbon. In addition, ozone can be decomposed into oxygen, which provides oxygen for aerobic microorganisms in the biological activated carbon filter, promotes biological oxidation and nitrification, and increases the service life of activated carbon.

[0051] As a preferred embodiment, the ozone double-layer activated carbon filter bed module includes the ozone double-layer activated carbon filter bed unit, a post-ozone contact tank, a biological activated carbon storage body and a fluidized granular activated carbon storage body.

[0052] In this embodiment, for the ozone double-layer activated carbon filter bed module:

[0053] 1. The post-ozone contact tank and the pre-ozone contact tank are both ozone contact tanks (ozonation contact reactors), which are treatment structures that diffuse ozone gas into the treated water and make it fully contact with the water and complete the reaction. The contact tank is mainly used to disinfect bacteria in domestic wastewater. The main ozone has a strong oxidizing effect on bacteria and pathogens in the wastewater, and is mostly used in large and medium-sized wastewater treatment plants.

[0054] Ozone contact oxidation equipment includes gas-liquid mixer, spiral blade pipeline mixer, ozone contact oxidation tower, and contact oxidation tank. Each contact equipment is suitable for different situations due to its different characteristics. For example, the contact oxidation tank is more suitable for water treatment projects with large flow and long contact time, such as water plants, reclaimed water reuse, sewage treatment plants, etc.

[0055] 2. Biological activated carbon (BAC): A sewage treatment technology for sewage treatment plants, which refers to a method that combines the decomposition of organic matter by microorganisms with the adsorption of organic matter by activated carbon, fixes microorganisms on activated carbon, increases the adsorption capacity of activated carbon, prolongs the service life of activated carbon, and enhances the ability to degrade organic matter in water. Activated carbon has the characteristics of large specific surface area and high porosity, which can quickly adsorb dissolved organic matter in water and gather a large number of microorganisms in water. Therefore, the microorganisms gathered on the surface of activated carbon can use these dissolved organic matter as a nutrient source, while a large number of aerobic microorganisms growing and breeding in the carbon bed adsorb and degrade small molecular organic matter. In this way, a layer of biofilm with dual functions of biological adsorption and oxidative degradation is formed on the surface of activated carbon, so it is called biological activated carbon. Microorganisms and activated carbon promote each other to form a relative equilibrium state, which significantly prolongs the regeneration cycle of activated carbon.

[0056] 3. Fluidized granular activated carbon (GAC, Granular Activated Carbon) is mainly physical adsorption.

[0057] 4. The role of ozone-bioactivated carbon technology in deep water treatment: The application of ozone-bioactivated carbon technology in deep water treatment has a great effect on improving the turbidity, color and appearance of water bodies, and creates a good cognitive foundation for the optimization of technology application strategies.

[0058] (1) Improve water turbidity: The degree of water turbidity is directly related to the density of organic molecules in the water. Therefore, in the process of treating water turbidity, staff need to select appropriate purification technology to accurately identify large molecular organic matter in the water and achieve scientific treatment of large molecular organic matter in the water. The application of ozone-bioactivated carbon technology in deep water treatment can break the steady state of organic molecules in the water, thereby improving the turbidity of the water. Specifically, the oxidation ability of ozone itself can continuously improve the removal efficiency of particles and turbidity during the filtration process. For example, ozone-bioactivated carbon can quickly complete the decomposition and adsorption of large molecular organic matter and small molecular organic matter in a relatively short period of time, which invisibly ensures the purity of the water and improves the level of deep treatment of water resources.

[0059] (2) Improve water chromaticity: Based on past experience, the chromaticity of water can largely indicate the amount of soluble pollutants in the water. Based on this intrinsic connection, in the water purification process, staff can determine the main substances that affect the chromaticity of water at this stage through the evaluation of chromaticity standards, including phenols, diazo and other substances. These substances dissolve in the water, causing the water color to change. After ozone is injected into the water, it uses its strong redox ability to decompose phenols and diazo in the water into ketones and aldehydes. The substances produced by oxidation, these newly generated substances, are all colorless, which can achieve an improvement in chromaticity. The application of activated carbon in water purification has a strong adsorption capacity for benzene compounds and small molecular humus. Through the combined use of purification effects, the large molecular organic matter, small molecular organic matter and humus in the water are comprehensively purified.

[0060] (3) Enhance the appearance of water: Inorganic matter, soluble mineral salts, humus, and chlorine contained in the water will affect the overall appearance and the actual drinking effect. Ozone-bioactivated carbon technology, with the help of ozone chemical oxidation, activated carbon physical and chemical adsorption, and microbial degradation, can simultaneously complete the purification task of inorganic substances and other substances. The entire purification process not only has a low purification difficulty and meets the water resource appearance treatment requirements in different scenarios, but also takes into account the relatively low cost of ozone and bioactivated carbon, it has strong practicality and can be promoted and applied on a large scale.

[0061] Embodiment 3

[0062] This embodiment provides a composite and efficient water treatment method based on activated carbon, comprising:

[0063] S1, setting an ozone double-layer activated carbon filter bed unit, including a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed macropores and the activity of the microbial membrane is maintained through backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed mesopores;

[0064] S2, constructing a mobile powder carbon multi-point dosing unit with automatic metering, automatic dosing and automatic alarm functions and coupling the mobile powder carbon multi-point dosing unit with the ozone double-layer activated carbon filter bed unit; the mobile powder carbon multi-point dosing unit includes a plurality of powder activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein the plurality of powder activated carbon dosing channels for different pore sizes include medium-pore powder activated carbon dosing channels and small-pore powder activated carbon dosing channels; the controller determines control information according to the real-time monitored water quality mutation situation, and the control information includes the powder activated carbon dosing channel to be started, the dosing type, quantity and dosing time of activated carbon powder; the dosing device performs automatic powder carbon multi-point dosing according to the control information;

[0065] S3, implement monitoring of sudden changes in water quality. In case of sudden changes in water quality, when organic, inorganic or heavy metal pollutants that do not appear under normal operation are detected, the powdered activated carbon addition channels with different pore sizes are automatically opened according to the molecular weight of the characteristic pollutants, and the activated carbon type with the maximum adsorption capacity for the characteristic pollutants is added; according to the type of pollutants, the best addition positions are set along the process line of the water purification facility. When the water quality suddenly changes, the best addition position is automatically indicated according to the type and concentration of the pollutants.

[0066] Compared with the prior art, the ozone double-layer activated carbon filter bed coupled with the powdered carbon multi-point dosing system, process method and complete water treatment system provided by the present invention have the following beneficial effects:

[0067] 1. The characteristics of the ozone double-layer activated carbon filter bed unit are as follows:

[0068] In view of the space required for the aggregation, growth and enrichment of microorganisms, the lower layer (two-thirds of the entire filter layer) uses macroporous granular activated carbon with a pore size of more than 50nm. This layer of activated carbon removes pollutants by enriching a large number of microorganisms. During daily operation, the backwashing mode and intensity of lowering the water level-gas flushing-gas-water flushing-high-intensity water flushing are followed to maintain the activity of the microbial membrane and keep the biomass at 150-200nmol P / g.

[0069] In view of the fact that the upper activated carbon mainly removes pollutants through adsorption, the upper layer of the double activated carbon filter bed (one third of the total filter layer) uses granular activated carbon with well-developed mesopores and a pore size of 2-50nm. This layer of activated carbon has a strong adsorption capacity for large molecular substances and can adsorb and remove pollutants that are difficult to degrade by microorganisms. As the carbon adsorption capacity gradually becomes saturated, the mesopore particle size of the upper layer is tested during the operation of the filter bed, and new activated carbon is replaced every 2 years.

[0070] 2. The characteristics of the coupled mobile powder carbon multi-point dosing unit are as follows:

[0071] In case of sudden changes in water quality, when organic, inorganic or other heavy metal pollutants that do not appear under normal operation appear, a movable powder carbon dosing facility unit is constructed, which has functions such as automatic metering, automatic dosing and automatic alarm;

[0072] The facility has both medium-pore (2-50nm) powdered activated carbon dosing channels and small-pore (<2nm) powdered activated carbon dosing channels. When water quality suddenly changes, the adaptive activated carbon dosing channel is automatically opened according to the molecular weight of the characteristic pollutants, and the activated carbon type with the maximum adsorption capacity for the characteristic pollutants is added;

[0073] The facility can set the best dosing locations along the water purification facility process according to the types of pollutants. When the water quality suddenly changes, it can automatically indicate the best dosing location according to the type and concentration of pollutants.

[0074] 3. The process advantages of coupling the ozone activated carbon filter bed with the powdered activated carbon multi-point dosing unit are as follows:

[0075] (1) The mobile powder carbon dosing unit can be turned on and off instantly. During daily operation, only the ozone activated carbon filter unit needs to be turned on to ensure operation, saving economic costs. When responding to sudden changes in water quality, the two units can quickly complement each other. The mobile powder carbon unit can be turned on to enhance the deep processing capacity and simultaneously reduce the impact on the ozone double-layer activated carbon filter bed, thereby extending the activated carbon replacement cycle in the filter bed.

[0076] (2) The ozone double-layer activated carbon filter bed is constructed by combining the lower and upper layers of double-layer activated carbon filter media in a ratio of (2:1), which strengthens the dual barriers of biological degradation and long-term physical adsorption degradation of the activated carbon filter bed. In addition, the precise selection of macroporous activated carbon in the lower filter media greatly improves the biodegradability of the filter bed. The careful selection of medium-pore activated carbon filter media in the upper layer and its replacement and regeneration once every two years enable the activated carbon filter to be replaced in time after adsorption saturation, thereby continuously maintaining effective pollutant adsorption capacity in the pool.

[0077] (3) The mobile powdered activated carbon dosing process unit, through the reserve of dual-channel activated carbon and the setting of movable dosing mode, can effectively supplement the ozone double-layer activated carbon filter bed unit in the case of sudden changes in water quality. When the removal capacity of the filter section is insufficient, the powdered activated carbon can use its specific surface area to greatly improve the adsorption capacity of organic matter, inorganic matter and metal ions. First, during the construction stage, it can scientifically reduce the removal load requirements of the overall process for the ozone activated carbon filter, thereby reducing the design and construction costs; second, during the operation stage, it can ensure the operating capacity of the ozone activated carbon pool during the period of sudden changes in water quality, reduce the backwash intensity of the filter, and achieve cost reduction and efficiency improvement.

[0078] In this embodiment:

[0079] The ozone double-layer activated carbon filter bed coupled with the powdered carbon multi-point addition process ensures that the water purification process continues to have the ability to adsorb and biodegrade pollutants. Compared with the weak physical adsorption effect of conventional activated carbon filters after a period of operation, it effectively improves the safety flexibility of water supply when new pollutants in raw water break out. When dealing with emergency situations such as sudden odor of raw water, it can save about 0.16 yuan of powdered activated carbon agent investment per ton of water, with the lowest operating cost, while solving the problems of monitoring frequency and result lag.

[0080] The above is a specific implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of this application.

Claims

1. A composite and efficient treatment system based on activated carbon, characterized in that: include: Mutually coupled ozone double-layer activated carbon filter bed unit and mobile powder carbon multi-point dosing unit; The ozone double-layer activated carbon filter bed unit comprises a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed macropores and the activity of the microbial membrane is maintained through the backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having developed mesopores; The mobile powdered carbon multi-point dosing unit includes a plurality of powdered activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein the plurality of powdered activated carbon dosing channels for different pore sizes include medium-pore-diameter powdered activated carbon dosing channels and small-pore-diameter powdered activated carbon dosing channels; the controller determines control information according to the real-time monitored water quality mutation situation, and the control information includes the powdered activated carbon dosing channel to be started, the dosing type, quantity and dosing time of activated carbon powder; the dosing device automatically performs multi-point dosing of powdered carbon according to the control information; The system is used to perform the following steps: S1, setting an ozone double-layer activated carbon filter bed unit, including a lower ozone double-layer activated carbon filter bed subunit and an upper ozone double-layer activated carbon filter bed subunit, wherein the lower ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed macropores and the activity of the microbial membrane is maintained through backwashing mode and intensity; and the upper ozone double-layer activated carbon filter bed subunit is distributed with granular activated carbon having well-developed mesopores; S2, constructing a mobile powder carbon multi-point dosing unit with automatic metering, automatic dosing and automatic alarm functions and coupling the mobile powder carbon multi-point dosing unit with the ozone double-layer activated carbon filter bed unit; the mobile powder carbon multi-point dosing unit includes a plurality of powder activated carbon dosing channels for different pore sizes, a control device and a dosing device; wherein the plurality of powder activated carbon dosing channels for different pore sizes include medium-pore powder activated carbon dosing channels and small-pore powder activated carbon dosing channels; the controller determines control information according to the real-time monitored water quality mutation situation, and the control information includes the powder activated carbon dosing channel to be started, the dosing type, quantity and dosing time of activated carbon powder; the dosing device performs automatic powder carbon multi-point dosing according to the control information; S3, implement monitoring of sudden changes in water quality, determine the characteristic pollutants corresponding to the sudden changes in water quality, automatically open the powdered activated carbon addition channels for different pore sizes according to the molecular weight of the characteristic pollutants, and add the type of activated carbon with the maximum adsorption capacity for the characteristic pollutants; according to the type of pollutants, classify and set the best addition positions along the process of the water purification facility, and automatically indicate the best addition positions according to the type and concentration of pollutants when the water quality suddenly changes; wherein, the sudden changes in water quality include the occurrence of one or more organic, inorganic and heavy metal pollutants that do not appear under normal operation.

2. The composite and efficient treatment system based on activated carbon according to claim 1, characterized in that: The medium-pore size powdered activated carbon adding channel adds activated carbon powder with a pore size of 2-50 nm.

3. The composite and efficient treatment system based on activated carbon according to claim 1, characterized in that: The small-pore powder activated carbon adding channel adds activated carbon powder with a pore size of less than 2 nm.

4. The composite and efficient treatment system based on activated carbon according to claim 1, characterized in that: The lower ozone double-layer activated carbon filter bed subunit is two-thirds of the overall height of the ozone double-layer activated carbon filter bed unit.

5. The composite and efficient treatment system based on activated carbon according to claim 1, characterized in that: The upper ozone double-layer activated carbon filter bed subunit is one third of the overall height of the ozone double-layer activated carbon filter bed unit.

6. A water treatment system based on the composite high-efficiency treatment system according to any one of claims 1 to 5, characterized in that: include: The raw water, water distribution well, pre-ozone contact tank, mixed flocculation sedimentation tank, sand filter, ozone double-layer activated carbon filter bed module and clean water tank are connected in sequence through pipelines. The clean water tank is connected to the water outlet and also includes a mobile powdered carbon multi-point dosing unit that is movable on the entire route from the raw water to the clean water tank.

7. The water treatment system according to claim 6, characterized in that: The ozone double-layer activated carbon filter bed module comprises the ozone double-layer activated carbon filter bed unit, a post-ozone contact tank, a biological activated carbon storage body and a fluidized granular activated carbon storage body.

8. The water treatment system according to claim 7, characterized in that: The post-ozone contact tank and the pre-ozone contact tank both comprise a gas-liquid mixer, a spiral blade pipeline mixer, an ozone contact oxidation tower and a contact oxidation tank.

Images