CN211226709U - Zero discharge system of desulfurization waste water - Google Patents
Zero discharge system of desulfurization waste water Download PDFInfo
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- CN211226709U CN211226709U CN201921924783.7U CN201921924783U CN211226709U CN 211226709 U CN211226709 U CN 211226709U CN 201921924783 U CN201921924783 U CN 201921924783U CN 211226709 U CN211226709 U CN 211226709U
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Abstract
The application discloses a desulfurization wastewater zero discharge system, which comprises a primary sedimentation tank, an aeration regulating tank, a wastewater softening device, a clarification tank, a ceramic membrane micro-filter, a capacitance desalting device and a solidification device, wherein the capacitance desalting device comprises an electric field capacitance desalting component and a shell, and the electric field capacitance desalting component is arranged in the shell; the electric field capacitance desalting component comprises a shell and a fixed shaft, wherein a plurality of conducting layers and electrodes are arranged in an annular region between the fixed shaft and the shell; the outer side close to the fixed shaft and the inner side of the shell are respectively provided with a first conducting layer and a second conducting layer, the outer side close to the first conducting layer and the inner side close to the second conducting layer are respectively provided with a first electrode and a second electrode, the first electrode and the second electrode are respectively provided with a first PVC net and a second PVC net, and a circulation flow channel is formed between the first PVC net and the second PVC net. This application simple structure, occupation space is littleer, can effectively reduce the process route that desulfurization waste water zero release was handled under the prerequisite of guaranteeing better treatment effect.
Description
Technical Field
The application belongs to the technical field of desulfurization waste water, concretely relates to desulfurization waste water zero discharge system.
Background
The desulfurization waste water is mainly the discharge water of an absorption tower in the wet desulfurization (limestone/gypsum method) process of boiler flue gas. In order to maintain the balance of the mass of the slurry circulation system of the desulfurization unit, prevent the soluble fraction of the flue gas, i.e., the chlorine concentration, from exceeding the specified value and ensure the quality of gypsum, a certain amount of waste water must be discharged from the system, which is mainly from the gypsum dewatering and cleaning system. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, and many of the impurities are the first pollutants which are strictly controlled in the national environmental protection standard. In order to reduce the pollution of the discharged wastewater to the environment, corresponding technical measures need to be adopted to realize real zero emission.
The basic concept of zero discharge of waste water is that the water in a factory is recycled in the factory through various treatment technologies except spontaneous combustion losses such as evaporation, air drying and the like, and the salt accumulated in a water circulation system forms crystals to be recycled without discharging any waste water outside. The design of a complete wastewater zero-discharge system needs to comprehensively consider water used by a power plant and waste water discharged from the power plant, wherein the high-salinity wastewater treatment difficulty of a flue gas desulfurization (taking a wet method as an example) system is high, the heavy metal ions are high and cannot be directly discharged, a common chemical treatment method is too complex, chemicals need to be added continuously, and a large amount of treated wastewater chloride ions cannot be removed.
At present, the domestic processes for zero discharge of desulfurization wastewater mainly comprise a membrane method, an evaporative crystallization technology, a flue direct injection technology, a bypass flue evaporation technology and the like, but the treatment processes all have the problems of high operating cost, large and complex system and the like. The high construction and disposal costs are very burdensome for the enterprise. Therefore, the main problem at present is how to improve the discharge process of the desulfurization wastewater and reduce the construction cost and the operation cost of the desulfurization wastewater zero-discharge system.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects or shortcomings of the prior art, the technical problem to be solved by the application is to provide a desulfurization wastewater zero-discharge system.
In order to solve the technical problem, the application is realized by the following technical scheme:
a desulfurization wastewater zero discharge system, which comprises a primary sedimentation tank, an aeration regulating tank, a wastewater softening device, a clarification tank, a ceramic membrane micro-filter, a capacitance desalting device and a solidification device which are sequentially connected,
the capacitive desalination device comprises: the electric field capacitive desalination device comprises a plurality of electric field capacitive desalination assemblies and a shell, wherein the electric field capacitive desalination assemblies are arranged in the shell in a longitudinal parallel mode;
the electric field capacitance desalting assembly comprises a shell and a fixed shaft, wherein a plurality of conducting layers and electrodes are arranged in an annular region between the fixed shaft and the shell;
the outer side close to the fixed shaft and the inner side of the shell are respectively provided with a first conducting layer and a second conducting layer, the outer side close to the first conducting layer and the inner side close to the second conducting layer are respectively provided with a first electrode and a second electrode, the outer side of the first electrode and the inner side of the second electrode are respectively provided with a first PVC net and a second PVC net, and a circulation flow channel for passing charged particles in the desulfurization wastewater is formed between the first PVC net and the second PVC net.
Further, in the desulfurization wastewater zero discharge system, a plurality of ceramic membrane tubes uniformly distributed in the vertical direction are arranged in the ceramic membrane micro-filter.
Further, in the desulfurization wastewater zero discharge system, the ceramic membrane tube comprises a porous support layer, a transition layer and a separation layer which are sequentially arranged from outside to inside, wherein the pore diameter of the porous support layer is larger than that of the transition layer, and the pore diameter of the transition layer is larger than that of the separation layer.
Further, in the desulfurization wastewater zero discharge system, an outlet of the ceramic membrane micro-filter is connected with an inlet of the aeration regulating tank, and backwash water in the ceramic membrane micro-filter is introduced into the aeration regulating tank.
Further, the zero discharge system of desulfurization waste water, wherein, the waste water softening installation is the triple box structure, wherein, the triple box structure is including the neutralization box that is used for adding lime cream, the setting tank that is used for adding organic sulfur and the flocculation case that is used for adding the coagulant that communicate in proper order.
Further, the desulfurization wastewater zero discharge system further comprises a flushing device, wherein the flushing device is communicated with the capacitive desalting device; the flushing device is used for introducing flushing water into the capacitive desalting device to flush desulfurization wastewater of the electric field capacitive desalting assembly to form concentrated water, and an outlet of the capacitive desalting device is connected with a water production tank.
Further, in the desulfurization wastewater zero discharge system, an outlet at the other end of the capacitive desalination device is communicated with the solidification device.
Further, in the desulfurization wastewater zero discharge system, the solidification device is an evaporation crystallizer, a tail flue bypass evaporator or an evaporation pond.
Further, foretell desulfurization waste water zero release system, wherein, still include sludge treatment equipment, the pond that just sinks with arrange the mud level meter in the clarification pond, when detecting sedimentary mud and surpass and predetermine the height, carry out the filter-pressing through mud delivery pump conveying to sludge treatment equipment and handle.
Further, in the desulfurization wastewater zero discharge system, the primary sedimentation tank and the clarification tank are both provided with automatic sludge scraping devices.
Compared with the prior art, the method has the following technical effects:
the annular capacitor desalting device is used for replacing the conventional reverse osmosis/electrodialysis to carry out concentration and reduction work after pretreatment in desulfurization wastewater treatment, the water yield of a concentration section can be increased, the tolerance of the device can be enhanced while the concentrated water yield is reduced, the pretreatment and crystallization equipment is simplified, the operation cost and the maintenance cost are reduced, the energy consumption is reduced, the pollution resistance is improved, and the purpose of zero discharge of desulfurization wastewater is realized.
In addition, the electrodes for adsorbing pollutants in saturation can be cleaned by simply removing the electric potential reversely or directly during the regeneration of the electric field capacitance desalting component, and compared with chemical regeneration or thermal regeneration, the electric field capacitance desalting component can effectively avoid secondary pollution caused by additives, which is obviously different from reverse osmosis, can carry out electrochemical degradation of organic particles in a working state, and further reduce the problems faced by other treatment methods.
This application simple structure, occupation space is littleer, can effectively reduce the process route among the desulfurization waste water zero release processing technology under the prerequisite of guaranteeing better treatment effect to running cost and equipment cost are high in solving desulfurization waste water zero release and handling, and the difficult scheduling problem is handled to the final product, have good popularization and application and worth.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the utility model provides a desulfurization waste water zero discharge system's schematic structure diagram.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
As shown in FIG. 1, the desulfurization waste water zero discharge system of the embodiment comprises a primary sedimentation tank 10, an aeration regulating tank 20, a waste water softening device 30, a clarification tank 40, a ceramic membrane micro-filter 50, a capacitance desalination device 60 and a solidification device 70 which are connected in sequence,
the capacitive desalination apparatus 60 comprises: a plurality of electric field capacitive desalination assemblies 601 and a housing, wherein the electric field capacitive desalination assemblies 601 are arranged in the housing in a longitudinally parallel manner;
the electric field capacitance desalting assembly 601 comprises a shell 61 and a fixed shaft 62, wherein a plurality of conducting layers and electrodes are arranged in an annular region between the fixed shaft 62 and the shell 61;
the outer side close to the fixed shaft 62 and the inner side of the shell 61 are respectively provided with a first conducting layer and a second conducting layer, the outer side close to the first conducting layer and the inner side close to the second conducting layer are respectively provided with a first electrode and a second electrode, the outer side of the first electrode and the inner side of the second electrode are respectively provided with a first PVC net and a second PVC net, and a circulation flow channel for passing charged particles in the desulfurization wastewater is formed between the first PVC net and the second PVC net.
In the present embodiment, an automatic sludge scraping device and a level meter are configured in the primary sedimentation tank 10, wherein the automatic sludge scraping device is used for removing the slurry concentrated in the primary sedimentation tank 10, the level meter is used for automatically monitoring the liquid level of the primary sedimentation tank 10, and the supernatant overflows to the aeration regulation tank 20.
Aeration equipment, ultrasonic wave level gauge are configured to aeration equalizing basin 20 bottom, and aeration equipment is used for carrying out the aeration to desulfurization waste water, oxidizes the sulfite ion in the desulfurization waste water into the sulfate radical ion, and ultrasonic wave level gauge automatic monitoring aeration equalizing basin 20's liquid level and automatic control elevator pump open and stop, send filtrate to through waste water elevator pump waste water softening installation 30.
In this embodiment, the wastewater softening device 30 is a triple box structure, wherein the triple box structure includes a neutralization box 31, a sedimentation box 32 and a flocculation box 33 which are sequentially communicated, wherein the neutralization box 31 is provided with a lime milk dosing mechanism, the sedimentation box 32 is provided with an organic sulfur dosing mechanism, the flocculation box 33 is provided with a coagulant dosing mechanism, and the lime milk, the organic sulfur and the coagulant can be respectively dosed to remove heavy metal ions, iron ions, fluorine ions and temporary hardness in the desulfurization wastewater.
Specifically, lime milk is added into the neutralization tank 31 to precipitate part of heavy metals; organic sulfur is added into the settling tank 32 to further precipitate heavy metal ions which cannot be precipitated through hydroxides; coagulant is added to the flocculation tank 33 to produce flocs.
In this embodiment, flocs in the wastewater are deposited at the bottom of the clarifier 40 by gravity, concentrated into sludge, and removed by a sludge scraper; the clean water rises to the top and overflows to the clean water tank, and then is sent to the ceramic membrane micro-filter 50 of the next process by the lift pump.
Further, automatic mud scraping devices are arranged in the primary sedimentation tank 10 and the clarification tank 40.
The embodiment further comprises a sludge treatment device 100, wherein sludge level meters are arranged in the primary sedimentation tank 10 and the clarification tank 40, and when the sludge deposited exceeds a preset height, the sludge is conveyed to the sludge treatment device 100 through a sludge conveying pump to be subjected to filter pressing treatment.
Further, the ceramic membrane micro-filter 50 is used for removing impurities in the desulfurization wastewater, wherein a plurality of ceramic membrane tubes 51 uniformly distributed in the vertical direction are arranged in the ceramic membrane micro-filter 50.
The ceramic membrane tube 51 comprises a porous support layer, a transition layer and a separation layer which are sequentially arranged from outside to inside, wherein the pore diameter of the porous support layer is larger than that of the transition layer, and the pore diameter of the transition layer is larger than that of the separation layer.
Further, the outlet of the ceramic membrane micro-filter 50 is connected with the inlet of the aeration regulating tank 20, wherein the backwashing water in the ceramic membrane micro-filter 50 is introduced into the aeration regulating tank 20.
In this embodiment, the conductive layer in the capacitive desalination apparatus 60 is preferably made of aluminum or copper, and is tightly attached to the outer side of the electrode, and a power interface connected to an external power source is provided, the first electrode and the second electrode are respectively connected with positive and negative dc voltage-stabilizing power through the conductive layer to form a positive plate and a negative plate, respectively, the external dc voltage-stabilizing power is not higher than a voltage value for generating hydrolysis, the voltage is limited within 1-1.5V to ensure normal operation, and the voltage on the surface of the electrode is stable and uniform.
In this embodiment, the desulfurization waste water is introduced into the capacitive desalination apparatus 60, and is in contact with the positive and negative electrode plates, the flow channel between the positive and negative electrode plates forms a migration space for ions during capacitive desalination, the surfaces of the positive and negative electrode plates are all covered with micropores and mesopores, the charged particles in the desulfurization waste water include ions and organic particles, the ions move to the electrodes with opposite signs when being adsorbed to the surfaces of the electrodes, the positively charged ions migrate to the negative electrode plates and are collected, and the negatively charged ions are collected to the positive electrode plates, so that an electric double layer is formed on the inner sides of the positive and negative electrode plates.
With the increase of the micro particles adsorbed by the capacitive desalination device 60, the particles are coalesced and concentrated on the surfaces of the electrode plates of the double electric layers, so that salts, colloidal particles or charged substances in the treated water stay on the surfaces of the two electrodes, the salt content in the water is greatly reduced, the purpose of separating salt from water is achieved, and the purified water can be obtained.
Ions are continuously gathered and concentrated on the surface of the electrode, organic particles or other charged substances in water are influenced by an electric double layer and can temporarily stick to the surface of the electrode plate, because under the interference of a strong electric field, active substances with extremely strong oxidizability although short existence time can be generated on the surface of the electrode, mainly-OH hydroxyl free radicals can be generated on the surface of the electrode, organic pollutants which are difficult to degrade can be decomposed more easily, no secondary pollution can be caused, and effluent with extremely low organic pollutant content can be obtained while brine is separated.
In the present embodiment, the device further comprises a flushing device 80, wherein the flushing device 80 is arranged in communication with the capacitive desalination device 60; the flushing device 80 is used for introducing flushing water into the capacitive desalting device 60 to flush the desulfurization wastewater of the electric field capacitive desalting component 601 to form concentrated water, and a water production tank 90 is connected to an outlet of the capacitive desalting device 60.
Further, the other end outlet of the capacitive desalination device 60 is communicated with the solidification device 70.
In this embodiment, the solidification apparatus 70 is an evaporative crystallizer, a back pass evaporator, or an evaporative pond.
The annular capacitor desalting device is used for replacing the conventional reverse osmosis/electrodialysis to carry out concentration and reduction work after pretreatment in desulfurization wastewater treatment, the water yield of a concentration section can be increased, the tolerance of the device can be enhanced while the concentrated water yield is reduced, the pretreatment and crystallization equipment is simplified, the operation cost and the maintenance cost are reduced, the energy consumption is reduced, the pollution resistance is improved, and the purpose of zero discharge of desulfurization wastewater is realized.
In addition, when the electric field capacitance desalination assembly 601 is regenerated, the electrodes for adsorbing pollutants in saturation can be cleaned by simply removing the electric potential reversely or directly, compared with chemical regeneration or thermal regeneration, secondary pollution caused by additives can be effectively avoided, which is obviously different from reverse osmosis, and electrochemical degradation of organic particles can be performed under a working state, so that the problems faced by other treatment methods are further reduced.
This application simple structure, occupation space is littleer, can effectively reduce the process route among the desulfurization waste water zero release processing technology under the prerequisite of guaranteeing better treatment effect to running cost and equipment cost are high in solving desulfurization waste water zero release and handling, and the difficult scheduling problem is handled to the final product, have good popularization and application and worth.
It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe certain components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. For example, a first certain component may also be referred to as a second certain component, and similarly, a second certain component may also be referred to as a first certain component without departing from the scope of embodiments herein.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (10)
1. A desulfurization wastewater zero discharge system, which is characterized in that,
comprises a primary sedimentation tank, an aeration regulating tank, a wastewater softening device, a clarification tank, a ceramic membrane micro-filter, a capacitance desalting device and a solidification device which are sequentially connected,
the capacitive desalination device comprises: the electric field capacitive desalination device comprises a plurality of electric field capacitive desalination assemblies and a shell, wherein the electric field capacitive desalination assemblies are arranged in the shell in a longitudinal parallel mode;
the electric field capacitance desalting assembly comprises a shell and a fixed shaft, wherein a plurality of conducting layers and electrodes are arranged in an annular region between the fixed shaft and the shell;
the outer side close to the fixed shaft and the inner side of the shell are respectively provided with a first conducting layer and a second conducting layer, the outer side close to the first conducting layer and the inner side close to the second conducting layer are respectively provided with a first electrode and a second electrode, the outer side of the first electrode and the inner side of the second electrode are respectively provided with a first PVC net and a second PVC net, and a circulation flow channel for passing charged particles in the desulfurization wastewater is formed between the first PVC net and the second PVC net.
2. The desulfurization waste water zero discharge system according to claim 1, wherein a plurality of ceramic membrane tubes are uniformly arranged in a vertical direction in the ceramic membrane micro-filter.
3. The desulfurization waste water zero discharge system of claim 2, wherein the ceramic membrane tube comprises a porous support layer, a transition layer and a separation layer which are arranged in sequence from outside to inside, wherein the pore diameter of the porous support layer is larger than that of the transition layer, and the pore diameter of the transition layer is larger than that of the separation layer.
4. The desulfurization waste water zero discharge system of claim 1, wherein the outlet of the ceramic membrane micro-filter is connected with the inlet of the aeration regulating tank, and the backwash water in the ceramic membrane micro-filter is introduced into the aeration regulating tank.
5. The desulfurization waste water zero discharge system of claim 1 or 2 or 3 or 4, wherein the waste water softening device is a triple box structure, wherein the triple box structure comprises a neutralization box for adding lime milk, a settling box for adding organic sulfur and a flocculation box for adding a coagulant which are communicated in sequence.
6. The desulfurization waste water zero discharge system of claim 1, 2, 3 or 4, further comprising a flushing device, wherein the flushing device is communicated with the capacitive desalination device; the flushing device is used for introducing flushing water into the capacitive desalting device to flush desulfurization wastewater of the electric field capacitive desalting assembly to form concentrated water, and an outlet of the capacitive desalting device is connected with a water production tank.
7. The desulfurization waste water zero discharge system of claim 6, wherein the outlet of the other end of the capacitive desalination device is communicated with the solidification device.
8. The desulfurization waste water zero discharge system of claim 1 or 2 or 3 or 4, wherein the solidification device is an evaporative crystallizer, a tail flue bypass evaporator or an evaporative pond.
9. The desulfurization waste water zero discharge system according to claim 1, 2, 3 or 4, further comprising a sludge treatment device, wherein a sludge level meter is arranged in the primary sedimentation tank and the clarification tank, and when the deposited sludge is detected to exceed a preset height, the sludge is conveyed to the sludge treatment device through a sludge conveying pump for filter pressing treatment.
10. The desulfurization waste water zero discharge system of claim 1, 2, 3 or 4, wherein an automatic mud scraping device is arranged in each of the primary settling tank and the clarifying tank.
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| CN201921924783.7U CN211226709U (en) | 2019-11-11 | 2019-11-11 | Zero discharge system of desulfurization waste water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116655065A (en) * | 2023-06-27 | 2023-08-29 | 奥顿(杭州)工业设备有限公司 | Adjustable current type circulating water desalting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116655065A (en) * | 2023-06-27 | 2023-08-29 | 奥顿(杭州)工业设备有限公司 | Adjustable current type circulating water desalting device |
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