CN212894309U - A system for recycling wastewater from pseudo-boehmite production - Google Patents
A system for recycling wastewater from pseudo-boehmite production Download PDFInfo
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- CN212894309U CN212894309U CN202021473154.XU CN202021473154U CN212894309U CN 212894309 U CN212894309 U CN 212894309U CN 202021473154 U CN202021473154 U CN 202021473154U CN 212894309 U CN212894309 U CN 212894309U
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Abstract
本实用新型涉及一种拟薄水铝石生产废水回用的系统，包括依次连接的调节池、悬浮物装置、多介质过滤器、纳滤装置、反渗透装置、MVR装置和结晶装置。本实用新型系统在调节池调节废水pH后，首先通过悬浮物装置将废水中的悬浮物最大化的去除，并实现悬浮物固体回收利用；再结合纳滤将废水中的二价离子一价离子分开，二价离子(硫酸根)在浓水侧最大化的富集和提浓，99％以上的硫酸根实现回收；然后通过对现有的MVR蒸发结晶装置将拟薄水铝石废水中的硫酸钠进行结晶蒸发，回收同时生成高纯度硫酸钠外售，蒸发结晶的冷凝水和纳滤产水混合后直接回用于生产过程中，使拟薄水铝石洗涤工序尽最大程度的实现水资源循环利用，达到废水回收利用的目的。
The utility model relates to a system for recycling waste water from pseudo-boehmite production, which comprises a regulating tank, a suspended matter device, a multi-media filter, a nanofiltration device, a reverse osmosis device, an MVR device and a crystallization device which are connected in sequence. After the pH of the wastewater is adjusted by the adjusting tank, the system of the utility model firstly removes the suspended solids in the wastewater to the maximum extent through the suspended solids device, and realizes the recycling of suspended solids; Separate, divalent ions (sulfate) are maximized and concentrated on the concentrated water side, and more than 99% of sulfate is recovered; Sodium sulfate is crystallized and evaporated, and high-purity sodium sulfate is generated at the same time for sale. The condensed water of evaporation and crystallization is mixed with nanofiltration product water and directly reused in the production process, so that the washing process of pseudo-boehmite can realize the water to the greatest extent. Resource recycling to achieve the purpose of wastewater recycling.
Description
Technical Field
The utility model belongs to the technical field of oil refining catalyst sewage treatment, concretely relates to system of pseudo-boehmite production waste water retrieval and utilization.
Background
Porous Al2O3The method is characterized in that a large amount of wastewater discharged in the production process (commonly called pseudo-boehmite) generates 13-15 tons of wastewater when 1 ton of catalyst pseudo-boehmite is produced, the wastewater is mainly generated in the washing process of a filter, the wastewater contains certain content of pseudo-boehmite particles, sulfate, chloride and the like, 98 percent of the wastewater exists in the form of sodium sulfate, the concentration of the wastewater is over 20000-30000 mg/L, and if the wastewater is directly discharged, a large amount of water resources are wasted.
Along with the strictness of national environmental protection legislation, the salt limit of discharged sewage is promoted, and the method adopts 'sewage diversion, differential treatment, source treatment and reasonable utilization' as an optimized way for the sewage treatment of a catalyst production plant according to the characteristics of the sewage generated by different production sections aiming at a catalyst production device. Aiming at the wastewater, as the main salt in the wastewater is sodium sulfate and the components are single, the recycling of the high-purity sodium sulfate wastewater and the recycling of water are realized, and the key point of low-cost sewage treatment is to prevent the wastewater from entering a comprehensive water tank to be mixed into mixed salt and reduce the difficulty of subsequent sewage treatment.
Disclosure of Invention
In view of the above problem, the utility model provides a system for pseudo-boehmite production waste water recycling to and method for pseudo-boehmite production waste water recycling, solved current problem of pseudo-boehmite production waste water recycle.
Therefore, the utility model provides a system for pseudo-boehmite production waste water retrieval and utilization, including equalizing basin, suspended solid device, multi-media filter, the device of receiving nanofiltration, reverse osmosis unit, MVR device and the crystallization device that connects gradually.
The utility model discloses a system for pseudo-boehmite production waste water retrieval and utilization, wherein preferred, the pH value less than or equal to 10 of waste water in the equalizing basin.
The system for recycling the wastewater generated in the production of pseudo-boehmite, wherein the suspension device is preferably a magnetic flocculation device or an electric flocculation device.
Pseudo-boehmite production waste water recycling system, wherein, the preferred crystallizer that still is connected with of suspended solid device.
Pseudo-boehmite production waste water recycling system, wherein preferred, contain pseudo-boehmite suspended particle, sulphate and chloride in the waste water, 98 wt% of solute is the sodium sulfate in the waste water, the concentration of waste water is more than 20000 mg/L.
Therefore, the utility model also provides a method for using the system to recycle the wastewater generated in the pseudoboehmite production, which comprises the following steps:
(1) the wastewater enters an adjusting tank to adjust the pH value of the wastewater;
(2) the wastewater enters a suspended matter device to remove suspended matters in the wastewater to obtain solid suspended matters and wastewater from which the suspended matters are removed;
(3) the wastewater from which the suspended substances are removed enters a multi-media filter to remove insoluble substances in the wastewater;
(4) then the fresh water produced by the nanofiltration device is used for producing clean water to be recycled to the pseudo-boehmite washing procedure, and the concentrated water produced by the nanofiltration device is continuously fed into a reverse osmosis device for further concentration to obtain concentrated water;
(5) fresh water generated in the concentration process of the reverse osmosis device is also used for producing clean water for recycling to the pseudo-boehmite washing process, concentrated water enters the MVR device for further concentration, and evaporated condensed water generated by the MVR device is also used for producing clean water for recycling to the pseudo-boehmite washing process;
(6) and (5) feeding the concentrated water subjected to further concentration in the step (5) into a crystallization device, and crystallizing and separating out a sodium sulfate solid.
In some embodiments, in step (1), it is preferable to adjust the pH of the wastewater to 10 or less.
In some embodiments, the suspension device is preferably a magnetic flocculation device or an electric flocculation device.
In some embodiments, in step (2), it is preferred that the solid suspension enters the crystallization tank for aging.
In some embodiments, it is preferable that the clean water has a sulfate radical mass content of not higher than 0.5% and a chloride mass content of not higher than 1%.
In some embodiments, it is preferred that the wastewater contains pseudo-boehmite suspended particles, sulfate and chloride, wherein 98 wt% of the contained compounds are sodium sulfate, and the concentration of the wastewater is 20000mg/L or more.
The utility model has the advantages as follows:
after the system adjusts the pH value of the wastewater in the adjusting tank, suspended matters in the wastewater are removed to the maximum extent through the suspended matter device, and the suspended matter solids are recycled; divalent ion and monovalent ion in the wastewater are separated by combining nanofiltration, divalent ion (sulfate radical) is maximally enriched and concentrated on the concentrated water side, and more than 99% of sulfate radical is recovered; then, sodium sulfate in the pseudo-boehmite waste water is crystallized and evaporated by an existing MVR evaporation crystallization device, high-purity sodium sulfate is generated for sale during recovery, condensed water of evaporation crystallization and nanofiltration produced water are mixed and then directly reused in the production process, so that the water resource recycling of the pseudo-boehmite washing process is realized to the greatest extent, and the purpose of waste water recycling is achieved.
The utility model discloses a suspended solid device adopts the getting rid of the suspended solid maximize in magnetism flocculation device or the electricity flocculation device with the waste water, does not introduce other chemical substance at the suspended solid in-process of getting rid of, makes valuable suspended solid can recycle.
Drawings
FIG. 1 is a schematic structural view of the system for recycling wastewater from the production of pseudo-boehmite.
Fig. 2 is a schematic structural diagram of a system for recycling wastewater from pseudo-boehmite production according to an embodiment of the present invention.
Reference numerals:
1-a regulating reservoir; 2-suspension device; 21-an electrocoagulation device; 3-a multi-media filter; 4-a nanofiltration device; 5, a reverse osmosis device; 6-an MVR device; 7-crystallization device.
Detailed Description
The following is a detailed description of embodiments of the invention: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following embodiments, and the experimental methods without specific conditions noted in the following embodiments are generally in accordance with conventional conditions.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a system for recycling wastewater from pseudoboehmite production according to the present invention. The utility model discloses a system for pseudo-boehmite production waste water retrieval and utilization, including equalizing basin 1, suspended solid device 2, multi-media filter, the device of receiving straining, reverse osmosis unit, MVR device and the crystallization device that connects gradually.
In some embodiments, the pH of the wastewater in the conditioning tank is 10 or less.
In some embodiments, the suspension device is a magnetic flocculation device or an electric flocculation device.
In some embodiments, a crystallization tank is also connected to the suspension apparatus.
Based on the above-mentioned system of pseudo-boehmite production waste water retrieval and utilization, the utility model discloses a method of pseudo-boehmite production waste water retrieval and utilization, including following step:
(1) the wastewater enters an adjusting tank 1 to adjust the pH value of the wastewater to be less than or equal to 10;
(2) the wastewater enters a suspended matter device 2 to remove suspended matters therein to obtain solid suspended matters and wastewater from which the suspended matters are removed;
(3) the wastewater from which the suspended substances are removed enters a multi-media filter 3 to remove insoluble substances therein; and (4) feeding the solid suspended substance into a crystallizing tank for aging treatment.
(4) Then the fresh water produced by the nanofiltration device 4 is used for producing clean water to be recycled to the pseudo-boehmite washing procedure, and the concentrated water produced by the nanofiltration device 4 is continuously fed into a reverse osmosis device 5 for further concentration to obtain concentrated water;
(5) fresh water generated in the concentration process of the reverse osmosis device 5 is also used for producing clean water for recycling to the pseudo-boehmite washing process, concentrated water enters the MVR device 6 for further concentration, and evaporated condensed water generated by the MVR device 6 is also used for producing clean water for recycling to the pseudo-boehmite washing process;
(6) and (5) feeding the concentrated water further concentrated in the step (5) into a crystallizing device 7, and crystallizing and separating clean sodium sulfate solid.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a system for recycling wastewater from pseudo-boehmite production according to an embodiment of the present invention. Wherein the suspension device 2 is an electric flocculation device 21.
In this embodiment, the utility model discloses a system of pseudo-boehmite production waste water retrieval and utilization at the during operation, concrete step is as follows:
the wastewater firstly enters the regulating tank 1, after the pH value of the wastewater is regulated to be less than or equal to 10, the wastewater enters the electric flocculation device 21, suspended matters in the wastewater are removed in the electric flocculation device 21, and the wastewater and solid suspended matters with the suspended matters removed are obtained. Of course the electric flocculation apparatus 21 can also be replaced by a magnetic flocculation apparatus.
Wherein the obtained suspended substance (mainly pseudoboehmite particles with a particle size of below 50 μm) is sent into a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering pseudoboehmite; because the utility model discloses detach waste water suspended solid and adopt electric flocculation or magnetism flocculation means, do not introduce other chemical, consequently this partial suspended solid can direct recycle.
Wherein, the wastewater without suspended matters enters the multi-medium filter 3 to further remove the insoluble matters, so that the wastewater after entering the nanofiltration system meets the requirement of the nanofiltration system on the content of the suspended matters in the wastewater; the wastewater after the insoluble substances are removed completely directly enters a nanofiltration device 4, and fresh water containing trace divalent salt and concentrated water containing a large amount of divalent salt (most of sodium sulfate) after primary concentration are obtained through separation.
Wherein, the fresh water is directly used for production and recycled to the pseudo-boehmite washing procedure, the mass content of sulfate radical in the fresh water is not higher than 0.5 percent, and the mass content of chloride is not higher than 1 percent. (if the content of the chloride in the fresh water is higher than 1% by mass, part of the water is discharged to the integrated sewage treatment plant)
Wherein, the concentrated water continues to enter the reverse osmosis device 5 for further concentration, the concentration of divalent salt (most of sodium sulfate) in the concentrated water is further improved, the load of a subsequent evaporation unit is reduced, and the energy consumption is reduced. The concentrated water enters an MVR device 6 for evaporation for crystallization; clean water generated by the reverse osmosis device 5 is also used for production and is recycled to the pseudo-boehmite washing procedure, and the mass content of sulfate radicals in the clean water is not higher than 0.5%.
The evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure to achieve the purpose of recycling the wastewater; and the wastewater concentrated by the MVR device 6 enters a crystallizing device 7, and clean sodium sulfate solid is separated out.
Example 1
The pseudo-boehmite production wastewater sent from a workshop is 30t/h, wherein the contents of sulfate ions, sodium ions and other substances are detailed in Table 1.
By adopting the system shown in FIG. 2, the wastewater firstly enters an adjusting tank 1, the pH value of the wastewater is adjusted to be less than or equal to 10 by adopting sulfuric acid, and then the wastewater enters an electric flocculation device 2 to remove suspended matters in the wastewater, so that the content of the suspended matters in the wastewater is less than 5 mug/L; the wastewater from which suspended substances are removed is further subjected to removal of insoluble substances by a multi-media filter 3, and the obtained suspended substances are sent to a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering the pseudoboehmite.
The wastewater after the insoluble substances are completely removed directly enters a nanofiltration device 4 to primarily concentrate and remove part of divalent salt, namely sulfate, the fresh water side is used for producing clean water (the mass content of the sulfate is not higher than 0.5 percent, and the mass content of the chloride is not higher than 1 percent) for about 20t/h to be recycled to the pseudo-boehmite washing procedure, and the concentrated water is about 10t/h to continuously enter a reverse osmosis device 5 to be further concentrated.
Concentrated water from the nanofiltration device 4 enters a reverse osmosis device 5 for further concentration, and the concentrated water enters an MVR device 6 for evaporation at about 5t/h for crystallization; fresh water generated by the reverse osmosis device 5 is used for producing clean water about 5t/h and is recycled to the pseudo-boehmite washing procedure; the concentrated water enters a crystallization process after being further concentrated in the MVR device 6, and clean sodium sulfate solid is separated out and is about 600 kg/h; the evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure at about 4 t/h. Thus about 29t/h of waste water is recycled.
Example 2
The pseudo-boehmite production wastewater sent from a workshop is 30t/h, wherein the contents of sulfate ions, sodium ions and other substances are detailed in Table 1.
By adopting the system shown in FIG. 2, the wastewater firstly enters an adjusting tank 1, the pH value of the wastewater is adjusted to be less than or equal to 10 by adopting sulfuric acid, and then the wastewater enters an electric flocculation device 2 to remove suspended matters in the wastewater, so that the content of the suspended matters in the wastewater is less than 5 mug/L; the wastewater from which suspended substances are removed is further subjected to removal of insoluble substances by a multi-media filter 3, and the obtained suspended substances are sent to a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering the pseudoboehmite.
The wastewater after the insoluble substances are completely removed directly enters a nanofiltration device 4 to primarily concentrate and remove part of divalent salt, namely sulfate, the fresh water side is used for producing clean water (the mass content of the sulfate is not higher than 0.5 percent, and the mass content of the chloride is not higher than 1 percent) for about 20t/h to be recycled to the pseudo-boehmite washing procedure, and the concentrated water is about 10t/h to continuously enter a reverse osmosis device 5 to be further concentrated.
Concentrated water from the nanofiltration device 4 enters a reverse osmosis device 5 for further concentration, and the concentrated water enters an MVR device 6 for evaporation at about 5t/h for crystallization; fresh water generated by the reverse osmosis device 5 is used for producing clean water about 5t/h and is recycled to the pseudo-boehmite washing procedure; the concentrated water enters a crystallization process after being further concentrated in the MVR device 6, and clean sodium sulfate solid is separated out at about 590 kg/h; the evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure at about 4 t/h. Thus about 29t/h of waste water is recycled.
TABLE 1
From the above examples it can be seen that:
after the system adjusts the pH value of the wastewater in the adjusting tank, suspended matters in the wastewater are removed to the maximum extent through the suspended matter device, and the suspended matter solids are recycled; divalent ion and monovalent ion in the wastewater are separated by combining nanofiltration, divalent ion (sulfate radical) is maximally enriched and concentrated on the concentrated water side, and more than 99% of sulfate radical is recovered; then, sodium sulfate in the pseudo-boehmite waste water is crystallized and evaporated by an existing MVR evaporation crystallization device, high-purity sodium sulfate is generated for sale during recovery, condensed water of evaporation crystallization and nanofiltration produced water are mixed and then directly reused in the production process, so that the water resource recycling of the pseudo-boehmite washing process is realized to the greatest extent, and the purpose of waste water recycling is achieved.
The utility model discloses a suspended solid device adopts the getting rid of the suspended solid maximize in magnetism flocculation device or the electricity flocculation device with the waste water, does not introduce other chemical substance at the suspended solid in-process of getting rid of, makes valuable suspended solid can recycle.
Of course, the present invention can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113968650A (en) * | 2020-07-23 | 2022-01-25 | 中国石油化工股份有限公司 | System and method for recycling wastewater generated in pseudoboehmite production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113968650A (en) * | 2020-07-23 | 2022-01-25 | 中国石油化工股份有限公司 | System and method for recycling wastewater generated in pseudoboehmite production |
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