Molecular sieve wastewater evaporation condensate treating and recycling system
By combining the DTRO membrane system and the roasting section in the molecular sieve production process, the organic matter in the evaporated condensate is adsorbed and decomposed, and the problems of long and high cost of molecular sieve wastewater treatment process are solved, and efficient COD removal and water resource reuse are achieved.
Patent Information
- Application Number
- CN202420273410.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-04
AI Technical Summary
In the prior art, the molecular sieve wastewater treatment process is long, the operation is complex and the operation cost is high, making it difficult to effectively reduce the COD and electrical conductivity of the wastewater, resulting in difficulty in reuse.
The DTRO membrane system is used to combine the roasting section in the molecular sieve production process to adsorb the organic matter in the evaporated condensate and decompose it in situ into CO2 and H2O through roasting to reduce COD, and the treated wastewater is reused as washing water to reduce total consumption. Water volume.
The wastewater treatment process flow is shortened, the operation is simplified, the operation costs are reduced, the stability is improved, and the COD removal is achieved without adding a new COD treatment device.
Smart Images
Figure CN222138878U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial wastewater treatment, in particular to a molecular sieve wastewater evaporation condensate treatment and reuse system. Background Art
[0002] Molecular sieves have been widely used in the fields of petrochemicals, environmental protection, medicine, etc. due to their large specific surface area, unique pore structure, high hydrothermal stability, and suitable acidity, becoming an important inorganic material. The wastewater generated in the production process of molecular sieves contains unused organic templates, resulting in high COD of the wastewater. In addition, there are a large number of inorganic substances such as silicon, sodium, and aluminum salts, and the salt content is high.
[0003] The prior art generally uses a treatment process combining evaporation process with other treatment processes for the treatment of molecular sieve wastewater. Authorization announcement number CN114477653B discloses a molecular sieve production process wastewater treatment method and system, which uses a process combining adsorption + biochemistry to achieve the standard discharge of molecular sieve wastewater evaporation condensate, but the process flow is long and the operating cost is high. Application publication number CN116002931A discloses a molecular sieve catalyst crystallization mother liquor and washing liquid wastewater zero discharge treatment method, in which the wastewater is first oxidized by wet catalytic oxidation to reduce the COD (Chemical Oxygen Demand) concentration before evaporation, wherein the wet catalytic oxidation method needs to be carried out under high temperature and high pressure environment, and has certain operating difficulties. In addition, although the method uses MBR (Membrane Bio-Reactor, membrane bioreactor) biochemical treatment + reverse osmosis membrane treatment to achieve the recycling of molecular sieve wastewater evaporation condensate, the process flow is long, the system is complex, the operation is inconvenient, and the operating cost is high. The evaporation condensate produced by evaporation treatment of SSZ-13 molecular sieve production wastewater has high COD concentration, conductivity and biological toxicity, which brings certain difficulties to its direct discharge and reuse. Utility Model Content
[0004] Aiming at the problems of long process flow, complicated operation and high running cost in the treatment of molecular sieve wastewater in the prior art, the utility model provides a molecular sieve wastewater evaporation condensate treatment and reuse system, which shortens the process flow of molecular sieve wastewater treatment, improves stability, simplifies operation and reduces running cost.
[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.
[0006] A molecular sieve wastewater evaporation condensate treatment and reuse system, characterized in that it comprises a molecular sieve wastewater evaporation condensate collection pool, a DTRO membrane system and a molecular sieve production system; the molecular sieve wastewater evaporation condensate collection pool is connected to the DTRO membrane system, and the DTRO membrane system is connected to the molecular sieve production system; the DTRO membrane system comprises a first DTRO unit and a second DTRO unit; the inlet of the first DTRO unit is connected to the outlet of the molecular sieve wastewater evaporation condensate collection pool, the outlet of the first DTRO unit is connected to the inlet of the second DTRO unit, and the outlet of the second DTRO unit is connected to the molecular sieve production system; the first DTRO unit comprises a primary DTRO unit; the second DTRO unit comprises a secondary DTRO unit; the inlet of the primary DTRO unit is connected to the molecular sieve wastewater evaporation condensate collection pool, the first outlet of the primary DTRO unit is connected to the inlet of the secondary DTRO unit, and the second outlet of the primary DTRO unit is connected to a triple-effect evaporation treatment unit; the first outlet of the secondary DTRO unit is connected to the molecular sieve production system, and the second outlet of the secondary DTRO unit is connected to the molecular sieve wastewater evaporation condensate collection pool.
[0007] Optionally, the first DTRO unit further includes a primary high-pressure pump; the primary high-pressure pump is arranged between the primary DTRO unit and the molecular sieve wastewater evaporation condensate collection tank.
[0008] Optionally, the second DTRO unit further includes a secondary high-pressure pump; the secondary high-pressure pump is arranged between the primary DTRO unit and the secondary DTRO unit.
[0009] Optionally, a reuse water pool is also included; the reuse water pool is arranged between the secondary DTRO unit and the molecular sieve production system.
[0010] Optionally, a water inlet pump for the filtering and washing device is provided between the reuse water pool and the molecular sieve production system.
[0011] Optionally, the molecular sieve production system includes a molecular sieve filtering and washing device, a molecular sieve drying device and a molecular sieve roasting device; the inlet of the molecular sieve filtering and washing device is connected to the water inlet pump of the filtering and washing device, and a molecular sieve drying device is arranged between the molecular sieve filtering and washing device and the molecular sieve roasting device.
[0012] Optionally, the first outlet of the molecular sieve filtering and washing device is connected to a molecular sieve drying device.
[0013] Optionally, the second outlet of the molecular sieve filtering and washing device is connected to a triple-effect evaporation processing unit.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The utility model is a molecular sieve wastewater evaporation condensate treatment and reuse system. By adsorbing the organic matter in the evaporation condensate into the molecular sieve, and transferring it to the roasting section in the molecular sieve production device, the organic matter is in situ decomposed into small molecular substances such as CO2 and H2O after roasting, saving the COD treatment device in the wastewater and reducing the wastewater treatment cost; and the utility model also reuses the molecular sieve wastewater as washing water in the washing process section of the molecular sieve production process, reducing the total water consumption of the molecular sieve production and reducing the molecular sieve production cost; at the same time, the utility model has a short process flow, simple operation, high stability and low operating cost. Therefore, the utility model can shorten the process flow of molecular sieve wastewater treatment, improve stability, simplify operation and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:
[0017] Figure 1 The utility model is a schematic diagram of the structure of a molecular sieve wastewater evaporation condensate treatment and reuse system.
[0018] In the figure: 1 is a molecular sieve wastewater evaporation condensate collection pool; 2 is a primary high-pressure pump; 3 is a primary DTRO unit; 4 is a secondary high-pressure pump; 5 is a secondary DTRO unit; 6 is a reuse water pool; 7 is a filter washing device water inlet pump; 8 is a molecular sieve filter washing device; 9 is a molecular sieve drying device; 10 is a molecular sieve roasting device; 11 is a three-effect evaporation treatment unit. DETAILED DESCRIPTION
[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0020] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0022] like Figure 1 As shown, the utility model is a molecular sieve wastewater evaporation condensate treatment and reuse system, including a molecular sieve wastewater evaporation condensate collection pool 1, a DTRO (disc tube reverse osmosis) membrane system, a reuse water pool 6 and a molecular sieve production system.
[0023] The molecular sieve wastewater evaporation condensate collection pool 1 is connected to the DTRO membrane system, the DTRO membrane system is connected to the reuse water pool 6, and the reuse water pool 6 is connected to the molecular sieve production system. Therefore, the molecular sieve wastewater evaporation condensate collection pool 1, the DTRO membrane system, the reuse water pool 6 and the molecular sieve production system are connected in sequence.
[0024] The molecular sieve wastewater evaporation condensate enters the molecular sieve wastewater evaporation condensate collection pool 1 .
[0025] The DTRO membrane system includes a first DTRO unit and a second DTRO unit.
[0026] The evaporated condensate of molecular sieve wastewater is further processed by the DTRO membrane system, and the permeate obtained is the washing water of the washing process section of the molecular sieve production process, which can be used in the molecular sieve production system, reducing the total water consumption of molecular sieve production and reducing the production cost of molecular sieve.
[0027] The first DTRO unit includes a primary high-pressure pump 2 and a primary DTRO unit 3 ; the second DTRO unit includes a secondary high-pressure pump 4 and a secondary DTRO unit 5 .
[0028] The inlet of the first-level high-pressure pump 2 is connected to the molecular sieve wastewater evaporation condensate collection pool 1, the outlet of the first-level high-pressure pump 2 is connected to the inlet of the first-level DTRO unit 3, the first outlet of the first-level DTRO unit 3 is connected to the inlet of the second-level high-pressure pump 4, the second outlet of the first-level DTRO unit 3 is connected to the triple-effect evaporation treatment unit 11, the outlet of the second-level high-pressure pump 4 is connected to the inlet of the second-level DTRO unit 5, the first outlet of the second-level DTRO unit 5 is connected to the reuse water pool 6, and the second outlet of the second-level DTRO unit 5 is connected to the molecular sieve wastewater evaporation condensate collection pool 1.
[0029] The molecular sieve wastewater evaporation condensate in the molecular sieve wastewater evaporation condensate collection pool 1 passes through the first-level high-pressure pump 2 and enters the first-level DTRO unit 3 for treatment. After the molecular sieve wastewater evaporation condensate is treated by the first-level DTRO unit 3, the concentrated liquid generated is connected to the three-effect evaporation treatment unit 11 through the second outlet of the first-level DTRO unit 3 for three-effect evaporation treatment, and the remaining liquid is transported to the second-level high-pressure pump 4 through the first outlet of the first-level DTRO unit 3 and sent to the second-level DTRO unit 5 for further treatment. The concentrated liquid generated by the second-level DTRO unit 5 enters the molecular sieve wastewater evaporation condensate collection pool 1 through the second outlet of the second-level DTRO unit 5 for re-treatment, and the permeate generated by the second-level DTRO unit 5 is input into the reuse water pool 6 through the first outlet of the second-level DTRO unit 5.
[0030] According to the operating conditions, the number of the first-level DTRO units 3 in the first DTRO unit and the number of the second-level DTRO units 5 in the second DTRO unit can be increased, and the second outlet of each first-level DTRO unit 3 is connected to the three-effect evaporation treatment unit 11, and the second outlet of each second-level DTRO unit 5 is connected to the molecular sieve wastewater evaporation condensate collection pool 1. According to the operating conditions, the first-level high-pressure pump 2 and the second-level high-pressure pump 4 are appropriately increased to meet the requirements of the washing process section of the molecular sieve production process of different standards.
[0031] The permeate produced by the second DTRO unit is stored in the reuse water pool 6, which is connected to the molecular sieve production system through the filter washing device inlet pump 7. The permeate in the reuse water pool 6 is input into the molecular sieve production system through the filter washing device inlet pump 7.
[0032] The molecular sieve production system comprises a molecular sieve filtering and washing device 8 , a molecular sieve drying device 9 and a molecular sieve calcining device 10 .
[0033] The inlet of the water inlet pump 7 of the filtering and washing device is connected to the outlet of the reuse water pool 6, the outlet of the water inlet pump 7 of the filtering and washing device is connected to the inlet of the molecular sieve filtering and washing device 8, the first outlet of the molecular sieve filtering and washing device 8 is connected to the molecular sieve drying device 9, the second outlet of the molecular sieve filtering and washing device 8 is connected to the triple-effect evaporation treatment unit 11, and the molecular sieve drying device 9 is connected to the molecular sieve roasting device 10.
[0034] The permeate produced by the secondary DTRO unit 5 is input into the reuse water pool 6 through the first outlet of the secondary DTRO unit 5. The filter washing device inlet pump 7 transports the liquid in the reuse water pool 6 to the molecular sieve filter washing device 8. The filtrate treated by the molecular sieve filter washing device 8 is subjected to the triple-effect evaporation treatment unit 11 for triple-effect evaporation treatment. The molecular sieve adsorbed organic matter is sequentially treated by the molecular sieve drying device 9 and the molecular sieve roasting device 10. The organic matter is roasted in the roasting device and decomposed into small molecular substances such as CO2 and H2O in situ, saving the wastewater COD treatment device.
[0035] The implementation method of the utility model is that the wastewater generated in the molecular sieve production process is subjected to triple-effect evaporation after acid adjustment, and the obtained molecular sieve wastewater evaporation condensate is stored in the molecular sieve wastewater evaporation condensate collection pool 1 for use, and the molecular sieve wastewater evaporation condensate stored in the molecular sieve wastewater evaporation condensate collection pool 1 will be sent to the DTRO membrane system, and the permeate obtained after being processed by the DTRO membrane system will be used as the washing water of the washing process section of the molecular sieve production process. The permeate generated by the DTRO membrane system is stored in the reuse water pool 6, and the permeate stored in the reuse water pool 6 is sent to the molecular sieve filtration and washing device 8 through the filter washing device inlet pump 7 to wash the molecular sieve, and the inorganic ions in the molecular sieve product are washed away while the organic matter in the reuse water is adsorbed by the molecular sieve, and then the molecular sieve enters the molecular sieve drying device 9 by gravity method, and is dried and then sent to the molecular sieve roasting device 10. The organic matter adsorbed in the molecular sieve is roasted into small molecular substances such as H2O and CO2, so that the organic matter adsorbed in the molecular sieve is removed without adding a COD treatment device.
[0036] The present invention is further explained below in conjunction with specific embodiments.
[0037] Example
[0038] The implementation method of the utility model is to subject the wastewater generated in the production process of SSZ-13 molecular sieve with CHA structure to triple-effect evaporation after acid adjustment. Under acidic conditions, organic amines in the wastewater react with acids to generate ammonium salts, heavy metals react with acids to generate inorganic salts, and silicon in the wastewater is precipitated. The triple-effect evaporation device removes inorganic salts (including Na, heavy metals, etc.), organic amines and most COD in the water. The COD value of the obtained evaporation condensate is 1389 mg / L, and the conductivity value is 103.51 μs / cm. Then, the evaporation condensate is sent to the DTRO membrane system with a high-pressure pump. After being treated by the DTRO membrane system, the water quality of the produced water is: CODcr=305 mg / L, conductivity=18.7 μs / cm, which does not meet the discharge standard requirements (COD≤50 mg / L) and cannot be discharged directly. The recycled water in the recycled water pool is sent to the filter washing device through the water inlet pump of the filter washing device to wash the molecular sieve. While the inorganic ions in the molecular sieve product are washed away, the organic matter in the recycled water is adsorbed by the molecular sieve. Then the molecular sieve enters the molecular sieve drying device through gravity method and is sent to the molecular sieve roasting device after drying. The organic matter adsorbed in the molecular sieve is converted into small molecular substances such as H2O and CO2 under high temperature roasting of >350℃, thereby achieving COD removal without adding a new COD treatment device.
[0039] In summary, the utility model is a molecular sieve wastewater evaporation condensate treatment and reuse system, which first reduces the conductivity value of the molecular sieve wastewater evaporation condensate through the DTRO membrane system, and then reuses it as washing water in the washing process section of the molecular sieve production process, reducing the total water consumption. The organic matter in the evaporation condensate is adsorbed in the molecular sieve and transferred to the roasting section in the molecular sieve production device. The organic matter is decomposed into small molecular substances such as CO2 and H2O in situ after roasting, saving the wastewater COD treatment device. The utility model has a short process flow, simple operation, high stability and low operating cost.
[0040] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.
[0041] The above content is a further detailed description of the utility model. It cannot be determined that the specific implementation methods of the utility model are limited to these. For ordinary technicians in the technical field to which the utility model belongs, they can make some simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the protection scope of the utility model determined by the submitted claims.
Claims
1. A molecular sieve wastewater evaporation condensate treatment and reuse system, characterized in that: It includes a molecular sieve wastewater evaporation condensate collection pool (1), a DTRO membrane system and a molecular sieve production system; The molecular sieve wastewater evaporation condensate collection pool (1) is connected to the DTRO membrane system, and the DTRO membrane system is connected to the molecular sieve production system; The DTRO membrane system includes a first DTRO unit and a second DTRO unit; The inlet of the first DTRO unit is connected to the outlet of the molecular sieve wastewater evaporation condensate collection pool (1), the outlet of the first DTRO unit is connected to the inlet of the second DTRO unit, and the outlet of the second DTRO unit is connected to the molecular sieve production system; The first DTRO unit includes a primary DTRO unit (3); the second DTRO unit includes a secondary DTRO unit (5); The inlet of the primary DTRO unit (3) is connected to the molecular sieve wastewater evaporation condensate collection pool (1), the first outlet of the primary DTRO unit (3) is connected to the inlet of the secondary DTRO unit (5), and the second outlet of the primary DTRO unit (3) is connected to the triple-effect evaporation treatment unit (11); The first outlet of the secondary DTRO unit (5) is connected to the molecular sieve production system, and the second outlet of the secondary DTRO unit (5) is connected to the molecular sieve wastewater evaporation condensate collection pool (1).
2. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 1, characterized in that: The first DTRO unit further comprises a primary high-pressure pump (2); The primary high-pressure pump (2) is arranged between the primary DTRO unit (3) and the molecular sieve wastewater evaporation condensate collection tank (1).
3. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 1, characterized in that: The second DTRO unit further comprises a secondary high-pressure pump (4); The secondary high-pressure pump (4) is arranged between the primary DTRO unit (3) and the secondary DTRO unit (5).
4. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 1, characterized in that: Also includes a recycling pool (6); The recycled water pool (6) is arranged between the secondary DTRO unit (5) and the molecular sieve production system.
5. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 4, characterized in that: A filter washing device water inlet pump (7) is provided between the reuse water pool (6) and the molecular sieve production system.
6. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 4, characterized in that: The molecular sieve production system comprises a molecular sieve filtering and washing device (8), a molecular sieve drying device (9) and a molecular sieve roasting device (10); The inlet of the molecular sieve filtering and washing device (8) is connected to the filtering and washing device water inlet pump (7), and a molecular sieve drying device (9) is arranged between the molecular sieve filtering and washing device (8) and the molecular sieve roasting device (10).
7. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 6, characterized in that: The first outlet of the molecular sieve filtering and washing device (8) is connected to the molecular sieve drying device (9).
8. A molecular sieve wastewater evaporation condensate treatment and reuse system according to claim 6, characterized in that: The second outlet of the molecular sieve filtering and washing device (8) is connected to a triple-effect evaporation processing unit (11).