CN212532579U - Desulfurization waste water concentration minimizing treatment equipment - Google Patents
Desulfurization waste water concentration minimizing treatment equipment Download PDFInfo
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- CN212532579U CN212532579U CN202020726032.0U CN202020726032U CN212532579U CN 212532579 U CN212532579 U CN 212532579U CN 202020726032 U CN202020726032 U CN 202020726032U CN 212532579 U CN212532579 U CN 212532579U
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Abstract
The utility model relates to a desulfurization waste water concentration and reduction treatment device, which comprises a tubular ultrafiltration circulating water tank, a first water pump, a tubular ultrafiltration device, a second water pump, a tubular ultrafiltration water production tank, a third water pump, a seawater reverse osmosis device, an SED raw water circulating water tank, a fourth water pump, a strong brine electrodialysis device and an SED concentrated water circulating water tank which are sequentially connected along the waste water treatment direction; a first return pipeline is arranged between the tubular ultrafiltration device and the tubular ultrafiltration circulating water tank; a second return pipeline is arranged between the strong brine electrodialysis device and the SED raw water circulating water tank, and a third return pipeline is arranged between the strong brine electrodialysis device and the tubular ultrafiltration water tank; a fourth return pipeline is arranged between the SED concentrated water circulating water tank and the concentrated brine electrodialysis device, and a fifth water pump is arranged on the fourth return pipeline; besides the desalination and recycling of the wastewater, the TDS content of the concentrated water can be greatly improved, the water quantity of the concentrated water is smaller, and the investment and operation cost of the subsequent evaporative crystallization process are greatly reduced.
Description
Technical Field
The utility model relates to a waste water treatment field especially relates to a concentrated minimizing treatment facility of desulfurization waste water.
Background
Generally speaking, flue gas generated by coal-fired boiler of power plant contains higher SO2The gas can cause serious pollution to the atmosphere, so the flue gas must be subjected to desulfurization treatment. The limestone-gypsum wet desulphurization process is the best and most widely applied process at present due to high reaction speed, high efficiency and high additive utilization rate. However, in the wet desulfurization process, the device can continuously discharge part of the desulfurization wastewater, which contains a large amount of pollutants such as suspended matters, salt, heavy metal ions and the like, and the wastewater must be treated and then discharged or recycled.
At present, most of domestic desulfurization wastewater of coal-fired power plants adopts a conventional treatment process of a three-header and a clarification tank, and the desulfurization wastewater is simply added with chemicals, flocculated and precipitated and then directly discharged or reused for spraying of coal yards or ash depots in the plants. However, the effluent of the process still has the problems of high salt content (TDS reaches 10000 or more), difficult standard reaching of suspended matters and the like, the direct discharge into the environment still has great influence on the water body, and the factory coal yard and the ash storage with large water quantity are difficult to completely consume.
With the development of social economy, the national regulation on pollutant emission is more and more strict, and the pollutant emission standard is also improved again and again. The policy requirements of 'technical policy for pollution control of thermal power plants' organized and made by the environmental protection department in 2017 are that the pollution control of the thermal power plants should follow and advocate a technical route combining source control and terminal treatment, and the thermal power plants are encouraged to realize the technical transformation of recycling waste water without discharge.
Therefore, the problems of high salt content in effluent, difficult standard reaching of suspended matters and the like in the traditional process are urgently solved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a remedy prior art not enough, provide a concentrated minimizing treatment facility of desulfurization waste water, have advantages such as concentrated multiplying power is high, product water quality is good, area is little, maintain convenient, easy management.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
a desulfurization wastewater concentration and reduction treatment device comprises a tubular ultrafiltration circulating water tank, a first water pump, a tubular ultrafiltration device, a second water pump, a tubular ultrafiltration water production tank, a third water pump, a seawater reverse osmosis device, an SED raw water circulating water tank, a fourth water pump, a strong brine electrodialysis device and an SED concentrated water circulating water tank which are sequentially connected along the wastewater treatment direction;
a first return pipeline is arranged between the tubular ultrafiltration device and the tubular ultrafiltration circulating water tank; a second return pipeline is arranged between the strong brine electrodialysis device and the SED raw water circulating water tank; a third return pipeline is arranged between the strong brine electrodialysis device and the tubular ultrafiltration water production tank; a fourth return pipeline is arranged between the SED concentrated water circulating water tank and the concentrated brine electrodialysis device, and a fifth water pump is arranged on the fourth return pipeline;
the tubular ultrafiltration device is connected with a first discharge pipeline; the seawater reverse osmosis device is connected with a second discharge pipeline; the strong brine electrodialysis device is connected with a third discharge pipeline.
Furthermore, a sixth water pump and a cartridge filter are sequentially arranged between the tubular ultrafiltration water production tank and the third water pump. Furthermore, the diameter of the membrane tube of the tubular ultrafiltration device is 5-15 mm.
Furthermore, the third discharge pipeline is connected with an evaporative crystallization device.
Furthermore, the desulfurization wastewater concentration and reduction treatment equipment further comprises a precipitation device connected in front of the tubular ultrafiltration circulating water tank, a triple box device is connected in front of the precipitation device, lime milk and soda are added into a first box body of the triple box device, organic sulfur and a flocculating agent are added into a second box body, and a coagulating agent is added into a third box body. Wherein add lime cream in the first case of traditional triple box, this application still adds soda besides lime to the biggest possibility gets rid of waste water hardness.
The working principle is as follows: wastewater treated by the triple box and the clarification tank enters a tubular ultrafiltration circulating water tank firstly, the tubular ultrafiltration circulating water tank is connected with a first water pump, the first water pump conveys the wastewater into a tubular ultrafiltration membrane device at a high flow rate, a water purification port of the tubular ultrafiltration device is connected with a second water pump, and a solution permeates through the tubular ultrafiltration membrane to generate purified water through negative pressure generated by the first water pump; the concentrated water of the tubular ultrafiltration device flows back to the tubular ultrafiltration circulating water tank through the first return pipeline, suspended matters in the wastewater can be gradually enriched in the tubular ultrafiltration circulating water tank, and are discharged through the first discharge pipeline when being enriched to a certain concentration, so that sludge treatment is carried out, and the higher circulating flow rate generated by the first water pump can effectively reduce the fouling and scaling of the membrane tube.
The tubular ultrafiltration device is mainly used for removing suspended matters, hardness and other heavy metal ions (calcium, magnesium ions and heavy metal ions generate suspended matter solids through chemical adding reaction in the triple box) which are easy to cause scaling in the desulfurization wastewater after the triple box pretreatment, so that the seawater reverse osmosis device meets the water inlet condition. For the desulfurization wastewater, the design flux of an ultrafiltration membrane of the tubular ultrafiltration device can reach 120L/(m)2H), membrane backwashing is not required for a plurality of times every day, only low-frequency chemical cleaning is required, the cleaning period is 4-8 weeks/time, and water production of other membrane elements is not influenced when a single membrane element is cleaned. The pipe diameter of the membrane pipe of the tubular ultrafiltration device is generally 5-15mm, which is far higher than the diameter of the membrane wire of the hollow fiber membrane, the anti-fouling and plugging capacity is strong, and the structural strength is high, so that the tubular ultrafiltration device is very suitable for the characteristics of high suspended matters, high salinity, high hardness and high heavy metal content of desulfurization wastewater.
The produced water from the tubular ultrafiltration device is conveyed to a tubular ultrafiltration water production tank through a second water pump, and the tubular ultrafiltration water production tank is connected with a sixth water pump to provide enough pressure to convey the wastewater to a cartridge filter. The purpose of arranging the security filter is to remove larger particle impurities possibly existing in the wastewater, protect the seawater reverse osmosis device and avoid the pollution blockage or damage of the reverse osmosis membrane. Wherein, the cartridge filter filters impurity particles larger than 5 um.
Then, the third water pump conveys the wastewater to the seawater reverse osmosis device for primary concentration of the wastewater, so that the soluble salt in the wastewater is mainly removed, the salt content of the produced water of the seawater reverse osmosis device is low (generally less than 1000mg/L), and the produced water can be discharged through a second discharge pipeline and reused for production; concentrated water generated by the seawater reverse osmosis device enters the next working procedure for concentration. Wherein, it is comparatively economical reasonable to utilize sea water reverse osmosis unit to concentrate desulfurization waste water to salt content within 10%, also relatively accords with mainstream brand sea water reverse osmosis membrane's design operating mode. In addition, the seawater reverse osmosis device can be designed into a two-section type or a multi-section type, and the pressure increase between sections can be increased according to the actual situation.
And then, concentrated water from the seawater reverse osmosis device enters an SED raw water circulating water tank in the operation process, is connected with a fourth water pump and provides certain water pressure to be conveyed to a concentrated brine electrodialysis device.
The concentrated brine electrodialysis (SED) device takes potential difference as driving force, and realizes the enrichment of salt ions in the wastewater by utilizing the permselectivity of an ion exchange membrane. The strong brine electrodialysis device mainly comprises an anode plate, a cathode plate, an ion exchange membrane stack and a pressing plate for fixing the above components, wherein the membrane stack comprises anion and cation exchange membranes which are alternately arranged, a concentrated water channel and a fresh water channel are sequentially formed between the membranes, and the anode plate and the cathode plate form an electrode water channel respectively with the adjacent ion exchange membranes. When the device is operated, direct-current voltage is applied to the cathode plate and the anode plate, and under the drive of a direct-current electric field, the negative ions and the positive ions respectively move to the anode and the cathode. Because the ion exchange membrane has selective permeability, ions can pass through if the fixed charge of the membrane is opposite to the charge of the ions in the ion migration process; if the charges of the fresh water channel and the concentrated water channel are the same, ions are repelled, and therefore the solution is diluted in the fresh water channel and concentrated in the concentrated water channel. But the polar water channel is internally provided with Cl-Lose electrons or H+The resulting electrons produce small amounts of chlorine and hydrogen.
In the operation process of the strong brine electrodialysis device, waste water in the SED raw water circulating water tank is subjected to fresh water circulation through a fresh water channel and a second return pipeline through a fourth water pump to generate fresh water, an SED concentrated water circulating water tank and a fifth water pump are arranged to perform concentrated water circulation through a concentrated water channel and the fourth return pipeline to generate concentrated solution, and an electrode solution tank and a seventh water pump are arranged to perform polar water circulation through a polar water channel and the fifth return pipeline to discharge chlorine and hydrogen overflowing from polar water.
The fresh water channel of the strong brine electrodialysis device generates fresh water with concentration equivalent to that of the seawater reverse osmosis device, the fresh water flows back to the tubular ultrafiltration water production tank for repeated treatment, and the strong water channel discharges waste water with further concentrated salt through a third discharge pipeline. The salt content of the concentrated water discharged from the third discharge pipeline can reach 15-20%, and the concentrated water can be directly evaporated and crystallized to realize zero discharge of the desulfurization wastewater.
Specifically, the TDS discharged from the triple box and clarification tank equipment can be reduced to 150-200 g/L from 10000 and above, and the running cost of a subsequent evaporative crystallization device is greatly reduced.
The utility model adopts the above technical scheme, the advantage that has is:
1. the desulfurization wastewater concentration and reduction treatment equipment has the advantages of high concentration ratio, good water quality of produced water, small occupied area, convenience in maintenance, easiness in management and the like; can realize integrating, automated design through rational design, reduce the cost of labor.
2. The desulfurization wastewater concentration and reduction treatment equipment is provided with a plurality of circular treatment processes, and compared with other existing concentration processes, the concentrated water has higher salt content (more than 15-20%) and smaller water volume, so that the investment and operation cost of the subsequent evaporative crystallization process are greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1, a tubular ultrafiltration circulating water tank, 2, a first water pump, 3, a tubular ultrafiltration device, 4, a second water pump, 5, a tubular ultrafiltration product water tank, 6, a third water pump, 7, a seawater reverse osmosis device, 8, an SED raw water circulating water tank, 9, a fourth water pump, 10, a strong brine electrodialysis device, 11, an SED concentrated water circulating water tank, 12, a first return line, 13, a second return line, 14, a third return line, 15, a fourth return line, 16, a fifth water pump, 17, a first discharge line, 18, a second discharge line, 19, a third discharge line, 20, a sixth water pump, 21, a cartridge filter, 22, an electrode liquid tank, 23, a seventh water pump, 24 and a fifth return line.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, in this embodiment, the desulfurization wastewater concentration and reduction treatment equipment includes a tubular ultrafiltration circulating water tank 1, a first water pump 2, a tubular ultrafiltration device 3, a second water pump 4, a tubular ultrafiltration product water tank 5, a third water pump 6, a seawater reverse osmosis device 7, an SED raw water circulating water tank 8, a fourth water pump 9, a concentrated brine electrodialysis device 10, and an SED concentrated brine circulating water tank 11, which are connected in sequence along a wastewater treatment direction;
a first return pipeline 12 is arranged between the tubular ultrafiltration device 3 and the tubular ultrafiltration circulating water tank 1; a second return pipeline 13 is arranged between the concentrated brine electrodialysis device 10 and the SED raw water circulating water tank 8; a third return pipeline 14 is arranged between the strong brine electrodialysis device 10 and the tubular ultrafiltration water production tank 5; a fourth return pipeline 15 is arranged between the SED concentrated water circulating water tank 11 and the concentrated brine electrodialysis device 10, and a fifth water pump 16 is arranged on the fourth return pipeline 15;
the tubular ultrafiltration device 3 is connected with a first discharge pipeline 17; the seawater reverse osmosis device 7 is connected with a second discharge pipeline 18; the concentrated brine electrodialysis device 10 is connected with a third discharge line 19.
Further, a sixth water pump 20 and a cartridge filter 21 are sequentially arranged between the tubular ultrafiltration water production tank 5 and the third water pump 6.
Furthermore, the diameter of the membrane tube of the tubular ultrafiltration device 3 is 5-15 mm.
Further, the third discharge line 19 is connected to a vapor crystallization device.
Furthermore, the desulfurization wastewater concentration and reduction treatment equipment further comprises a precipitation device connected in front of the tubular ultrafiltration circulating water tank, a triple box device is connected in front of the precipitation device, lime milk and soda are added into a first box body of the triple box device, organic sulfur and a flocculating agent are added into a second box body, and a coagulating agent is added into a third box body. Lime milk is added into a first tank of the traditional triple box, and soda ash is added in addition to lime so as to remove the hardness of wastewater to the maximum extent.
The working principle is as follows: wastewater treated by the triple box and the clarification tank firstly enters a tubular ultrafiltration circulating water tank 1, the tubular ultrafiltration circulating water tank 1 is connected with a first water pump 2, the first water pump 2 conveys the wastewater into a tubular ultrafiltration membrane device 3 at a high flow rate, a water purifying port of the tubular ultrafiltration device is connected with a second water pump 4, and a solution is enabled to permeate the tubular ultrafiltration membrane to generate purified water through the negative pressure generated by the first water pump and the second water pump and then enters a tubular ultrafiltration water production tank 5; tubular ultrafiltration device's dense water flows back to tubular ultrafiltration circulating water tank 1 through first return line 12, and the suspended solid in the waste water can be in tubular ultrafiltration circulating water tank 1 enrichment step by step, discharges through first discharge line 17 when enriching to certain concentration, carries out sludge treatment, and wherein the higher circulation velocity of flow that first water pump 2 produced can effectively reduce the stifled scale deposit of dirt of membrane tube.
The tubular ultrafiltration device 3 is mainly used for removing suspended matters, hardness and other heavy metal ions (calcium, magnesium ions and heavy metal ions are added with drugs in the triple box)Suspended solid is generated by reaction) so as to meet the water inlet condition of the seawater reverse osmosis device. For the desulfurization wastewater, the design flux of the ultrafiltration membrane of the tubular ultrafiltration device 3 can reach 120L/(m)2H), membrane backwashing is not required for a plurality of times every day, only low-frequency chemical cleaning is required, the cleaning period is 4-8 weeks/time, and water production of other membrane elements is not influenced when a single membrane element is cleaned. The pipe diameter of the membrane pipe of the tubular ultrafiltration device 3 is generally 5-15mm, which is far higher than the diameter of the membrane wire of the hollow fiber membrane, the anti-fouling and plugging capacity is strong, and the structure strength is high, so that the tubular ultrafiltration device is very suitable for the characteristics of high suspended matters, high salinity, high hardness and high heavy metal content of desulfurization wastewater.
The produced water from the tubular ultrafiltration device 3 is delivered by a second water pump 4 to a tubular ultrafiltration water production tank 5, which is connected to a sixth water pump 20 to provide sufficient pressure to deliver the wastewater to a cartridge filter 21. The purpose of the cartridge filter 21 is to remove larger particles of impurities that may be present in the wastewater, protect the seawater reverse osmosis unit 7, and prevent fouling or damage to the reverse osmosis membrane. Wherein the cartridge filter 21 filters foreign particles larger than 5 um.
Then, the third water pump 6 is used for conveying the wastewater to the seawater reverse osmosis device 7 for primary concentration of the wastewater, so that the soluble salt in the wastewater is mainly removed, the salt content of the produced water of the seawater reverse osmosis device 7 is low (generally less than 1000mg/L), and the produced water can be discharged through the second discharge pipeline 18 and reused for production; the concentrated water from the seawater reverse osmosis device 7 enters the next working procedure for concentration. Wherein, it is comparatively economical reasonable to utilize sea water reverse osmosis unit 7 to concentrate desulfurization waste water to salt content within 10%, also relatively accords with mainstream brand sea water reverse osmosis membrane's design operating mode. In addition, the reverse osmosis can be designed into two-section type or multi-section type, and the pressure boosting between sections can be added according to the actual situation.
Then, the concentrated water from the seawater reverse osmosis device 7 enters the SED raw water circulating water tank 8 in the operation process, and the concentrated water is connected with the fourth water pump 9 to provide a certain water pressure and is conveyed to the concentrated brine electrodialysis device 10.
The strong brine electrodialysis (SED) device 10 uses potential difference as driving force and utilizes an ion exchange membraneThe selective permeability of the membrane realizes the enrichment of salt ions in the wastewater. The strong brine electrodialysis device 10 mainly comprises an anode plate, a cathode plate, an ion exchange membrane stack and a pressing plate for fixing the above components, wherein the membrane stack comprises anion and cation exchange membranes which are alternately arranged, a concentrated water channel and a fresh water channel are sequentially formed between the membranes, and the anode plate and the cathode plate form an electrode water channel respectively with the adjacent ion exchange membranes. When the device is operated, direct-current voltage is applied to the cathode plate and the anode plate, and under the drive of a direct-current electric field, the negative ions and the positive ions respectively move to the anode and the cathode. Because the ion exchange membrane has a permselectivity ion migration process, if the fixed charge of the membrane is opposite to the charge of the ions, the ions can pass through; if the charges of the fresh water channel and the concentrated water channel are the same, ions are repelled, and therefore the solution is diluted in the fresh water channel and concentrated in the concentrated water channel. But the polar water channel is internally provided with Cl-Lose electrons or H+The resulting electrons produce small amounts of chlorine and hydrogen.
In the operation process of the concentrated brine electrodialysis device 10, wastewater in the SED raw water circulating water tank 8 is subjected to fresh water circulation through the fresh water channel and the second return pipeline 13 by the fourth water pump 9 to generate fresh water, the SED concentrated water circulating water tank 11 and the fifth water pump 16 are additionally arranged to perform concentrated water circulation through the concentrated water channel and the fourth return pipeline 15 to generate concentrated solution, and the electrode solution tank 22 and the seventh water pump 23 are additionally arranged to perform polar water circulation through the polar water channel and the fifth return pipeline 24 to discharge chlorine and hydrogen overflowing from polar water.
The fresh water channel of the strong brine electrodialysis device 10 will generate fresh water with concentration equivalent to that of the seawater reverse osmosis device 7, and the fresh water flows back to the tubular ultrafiltration water generating tank 5 for repeated treatment, and the strong water channel discharges waste water with further concentrated salt through the third discharge pipeline 19. The salt content of the concentrated water discharged from the third discharge pipeline 19 can reach 15-20%, and the concentrated water can be directly evaporated and crystallized to realize zero discharge of the desulfurization wastewater.
Specifically, the TDS discharged from the triple box and clarification tank equipment can be reduced to 150-200 g/L from 10000 and above, and the running cost of a subsequent evaporative crystallization device is greatly reduced.
Through the treatment, the TDS of the concentrated water can be concentrated to 150-200 g/L, and the operation cost of a subsequent evaporative crystallization device is greatly reduced.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (4)
1. The desulfurization wastewater concentration and reduction treatment equipment is characterized by comprising a tubular ultrafiltration circulating water tank, a first water pump, a tubular ultrafiltration device, a second water pump, a tubular ultrafiltration water production tank, a third water pump, a seawater reverse osmosis device, an SED raw water circulating water tank, a fourth water pump, a strong brine electrodialysis device and an SED concentrated water circulating water tank which are sequentially connected along the wastewater treatment direction;
a first return pipeline is arranged between the tubular ultrafiltration device and the tubular ultrafiltration circulating water tank;
a second return pipeline is arranged between the strong brine electrodialysis device and the SED raw water circulating water tank;
a third return pipeline is arranged between the strong brine electrodialysis device and the tubular ultrafiltration water production tank;
a fourth return pipeline is arranged between the SED concentrated water circulating water tank and the concentrated brine electrodialysis device, and a fifth water pump is arranged on the fourth return pipeline;
the tubular ultrafiltration device is connected with a first discharge pipeline;
the seawater reverse osmosis device is connected with a second discharge pipeline;
the strong brine electrodialysis device is connected with a third discharge pipeline.
2. The desulfurization wastewater concentration and reduction treatment equipment as claimed in claim 1, wherein a sixth water pump and a cartridge filter are further arranged between the tubular ultrafiltration water production tank and the third water pump in sequence.
3. The desulfurization wastewater concentration and reduction treatment equipment as recited in claim 1, wherein the diameter of the membrane tube of the tubular ultrafiltration device is 5-15 mm.
4. The desulfurization wastewater concentration and reduction treatment equipment as recited in claim 1, wherein the third discharge line is connected to an evaporative crystallization device.
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