High-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles

Abstract

The invention discloses a high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles. The system comprises an ozone catalytic oxidation reactor, and a raw water tank, an ozone micro-nano bubble water supply mechanism and a water production tank which are communicated with the ozone catalytic oxidation reactor, the ozone micro-nano bubble water supply mechanism comprises an ozone generator and a micro-nano bubble generator which are communicated with each other. The micro-nano bubble generator is adopted to generate ozone micro-nano bubble water to improve the dissolved amount of ozone in water, the high-salt-resistant ozone catalyst and the novel ozone catalyst filler frame are adopted to improve the ozone catalytic oxidation efficiency, the sewage COD degradation efficiency is further improved, meanwhile, the ozone utilization rate is increased, and the sewage treatment cost is reduced. The method has a wide application prospect in the aspect of high-salt organic waste liquid treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of waste liquid treatment, and in particular relates to an ozone catalytic oxidation system for high-salt organic waste liquid based on micro-nano bubbles. Background Art

[0002] With the rapid development of industry, a large amount of high-salt organic waste liquid is produced in industries such as petroleum, chlor-alkali, chemical, food processing, printing and dyeing, pharmaceutical and papermaking, which are characterized by high salt content and high COD. How to treat this type of wastewater has become a difficult problem currently faced. Due to the presence of high salt content and high concentration of chloride ions, some wastewaters have a salt content of more than 10% and chloride ions of more than 50,000 mg / L, which are inhibitory to the growth and reproduction of microorganisms and limit the biochemical treatment process; high-salt organic waste liquid has high COD, some as high as 100,000 mg / L, resulting in low water production rate of membrane treatment process, fouling and unstable operation, which limits the membrane treatment process. At present, the commonly used treatment process for high-salt organic waste liquid is advanced oxidation process, but it also has the problem of low efficiency. Summary of the invention

[0003] The present invention is proposed to solve the problem of low efficiency of treating high-salt waste liquid by traditional advanced oxidation process, and its purpose is to provide an ozone catalytic oxidation system for high-salt organic waste liquid based on micro-nano bubbles.

[0004] The present invention is achieved through the following technical solutions:

[0005] A micro-nano bubble-based high-salt organic waste liquid ozone catalytic oxidation system comprises an ozone catalytic oxidation reactor and a raw water tank connected to the ozone catalytic oxidation reactor, an ozone micro-nano bubble water supply mechanism and a water production tank; the ozone micro-nano bubble water supply mechanism comprises an ozone generator and a micro-nano bubble generator connected to each other.

[0006] In the above technical solution, a water inlet pump and a water inlet flow meter are arranged on the pipeline between the raw water tank and the ozone catalytic oxidation reactor.

[0007] In the above technical solution, an intake ozone concentration detector is arranged on the pipeline between the ozone generator and the micro-nano bubble generator; and the ozone generator is cooled by a chiller.

[0008] In the above technical solution, the ozone catalytic oxidation reactor includes a reactor shell and an ozone catalyst packing group arranged in the reactor shell; the ozone catalyst packing group includes a plurality of ozone catalyst packing units arranged along the height direction.

[0009] In the above technical solution, a tail gas discharge port is arranged on the top of the reactor shell, and the tail gas discharge port is connected to the ozone tail gas destructor; a circulating water outlet and a water outlet are arranged on the upper side wall of the reactor shell; the circulating water outlet is connected to the ozone micro-nano bubble generator, and a circulating pump is arranged between the two; the water outlet is connected to the water production tank; the circulating water outlet and the water outlet are arranged above the ozone catalyst packing group, and the horizontal position of the water outlet is higher than the horizontal position of the circulating water outlet; a stock liquid inlet and a circulating water inlet are arranged on the lower side wall of the reactor shell; the stock liquid inlet is connected to the raw water tank; the stock liquid inlet and the circulating water inlet are arranged below the ozone catalyst packing group, and the horizontal position of the circulating water inlet is higher than the horizontal position of the stock liquid inlet.

[0010] In the above technical solution, the ozone catalyst packing unit includes a packing frame and an ozone catalyst packing loaded in the packing frame; the packing frame is a hollow cylindrical structure composed of a sleeve and end covers arranged at two ends of the sleeve, and the end covers are connected to the sleeve by bolts.

[0011] In the above technical solution, the sleeve is a φ3mm316L stainless steel microporous perforated mesh plate; the end cover is a disc-shaped structure composed of a semicircular stainless steel plate and a semicircular stainless steel microporous perforated mesh plate; the stainless steel plate part adopts a 3mm thick 316 stainless steel plate, and the stainless steel microporous perforated mesh plate adopts a φ3mm316L stainless steel microporous perforated mesh plate.

[0012] In the above technical solution, the stainless steel plate parts and the stainless steel microporous perforated mesh plate parts of the two end covers at the top and bottom of the filling frame are arranged alternately.

[0013] In the above technical solution, the stainless steel plate parts and the stainless steel microporous perforated mesh plate parts of the adjacent end plates of the adjacent ozone catalyst packing units in the ozone catalyst packing group are arranged opposite to each other.

[0014] In the above technical solution, the ozone catalyst filler is a high-salt resistant ozone catalyst.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles, which adopts a micro-nano bubble generator to generate ozone micro-nano bubble water to increase the solubility of ozone in water, adopts a high-salt resistant ozone catalyst and a novel ozone catalyst filler frame to improve the ozone catalytic oxidation efficiency, thereby improving the degradation efficiency of sewage COD, and at the same time improving the utilization rate of ozone, and has broad application prospects in the treatment of high-salt organic waste liquid.

[0017] The present invention adopts a micro-nano bubble generator to dissolve ozone and combines it with an ozone catalyst filler frame baffle, which greatly improves the utilization rate of ozone to more than 90%. The present invention can treat wastewater with a TDS of up to 100,000 mg / L, and the COD degradation rate can reach about 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the ozone catalytic oxidation reactor in the present invention;

[0020] Figure 3 It is a schematic structural diagram of the ozone catalyst packing unit in the present invention;

[0021] Figure 4 It is a structural schematic diagram of the end cover in the present invention.

[0022] in:

[0023] 1. Raw water tank; 2. Water inlet pump; 3. Water inlet flowmeter; 4. Ozone catalytic oxidation reactor; 5. Water production tank; 6. Chiller; 7. Ozone generator; 8. Inlet ozone concentration detector; 9. Micro-nano bubble generator; 10. Circulation pump; 11. Exhaust ozone concentration detector; 12. Ozone exhaust gas destroyer; 41. Ozone catalyst packing unit; 42. Raw liquid water inlet; 43. Circulating water inlet; 44. Circulating water outlet; 45. Exhaust gas outlet; 46. Water outlet; 411. Ozone catalyst packing; 412. Sleeve; 413. End cover.

[0024] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] Example 1

[0027] like Figure 1 As shown, a high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles includes an ozone catalytic oxidation reactor 4 and a raw water tank 1 connected to the ozone catalytic oxidation reactor 4, an ozone micro-nano bubble water supply mechanism and a water production tank 5;

[0028] A water inlet pump 2 and a water inlet flow meter 3 are arranged on the pipeline between the raw water tank 1 and the ozone catalytic oxidation reactor 4; the high-salt organic waste liquid in the raw water tank 1 is lifted by the water inlet pump 2 and enters the ozone catalytic oxidation reactor 4 for ozone catalytic oxidation reaction, and then enters the production water tank 5;

[0029] The ozone micro-nano bubble water supply mechanism is interconnected with an ozone generator 7 and a micro-nano bubble generator 9, and an intake ozone concentration detector 8 is arranged on the pipeline between the ozone generator 7 and the micro-nano bubble generator 9; the ozone gas inhaled by the ozone micro-nano bubble generator 9 comes from the ozone generator 7, and the ozone generated by the ozone generator 7 enters the ozone micro-nano bubble generator 9 after passing through the intake ozone concentration detector 8;

[0030] The ozone generator 7 is cooled by a water chiller 6;

[0031] The ozone micro-nano bubble water outlet of the micro-nano bubble generator 9 is connected to the inlet of the ozone catalytic oxidation reactor 4; the micro-nano bubble generator 9 uses the Venturi and cutting principle to suck the ozone gas into the micro-nano bubble generator cavity through the negative pressure formed by the high-speed water flow and cuts it into micro-nano bubbles that dissolve in water and then enter the ozone catalytic oxidation reactor 4;

[0032] The tail gas discharge port 45 of the ozone catalytic oxidation reactor 4 is connected to the ozone tail gas destroyer 12, and a tail gas ozone concentration detector 11 is arranged on the pipeline between the two; the ozone tail gas produced by the ozone catalytic oxidation reactor 4 passes through the tail gas ozone concentration detector 11 and enters the ozone tail gas destroyer, and the ozone is destroyed and then discharged into the atmosphere;

[0033] The ozone in the ozone catalytic oxidation reactor 4 is added by using ozone micro-nano bubble water;

[0034] like Figure 2 As shown, the ozone catalytic oxidation reactor 4 includes a reactor shell 47 and an ozone catalyst packing group arranged in the reactor shell 47; the ozone catalyst packing group includes a plurality of ozone catalyst packing units 41 arranged along the height direction;

[0035] The top of the reactor shell 47 is provided with an exhaust gas outlet 45, and the exhaust gas outlet 45 is connected to the ozone exhaust gas destroyer 12;

[0036] The upper side wall of the reactor shell 47 is provided with a circulating water outlet 44 and an outlet 46; the circulating water outlet 44 is connected to the ozone micro-nano bubble generator 9, and a circulating pump 10 is arranged between the two; the outlet 46 is connected to the water production tank 5; the circulating water outlet 44 and the outlet 46 are arranged above the ozone catalyst packing group, and the horizontal position of the outlet 46 is higher than the horizontal position of the circulating water outlet 44;

[0037] The lower side wall of the reactor shell 47 is provided with a raw liquid water inlet 42 and a circulating water water inlet 43; the raw liquid water inlet 42 is connected to the raw water tank 1; the raw liquid water inlet 42 and the circulating water water inlet 43 are arranged below the ozone catalyst packing group, and the horizontal position of the circulating water inlet 43 is higher than the horizontal position of the raw liquid water inlet 42;

[0038] The material of the reactor shell 47 is carbon steel lined with 5mm polytetrafluoroethylene;

[0039] like Figure 3 , 4 As shown, the ozone catalyst packing unit 41 includes a packing frame and an ozone catalyst packing 411 filled in the packing frame;

[0040] The packing frame is a hollow cylindrical structure consisting of a sleeve 412 and end covers 413 disposed at two ends of the sleeve 412, and the end covers 413 and the sleeve 412 are connected by bolts;

[0041] The sleeve 412 is a φ3mm316L stainless steel micro-hole punching mesh plate;

[0042] The end cover 413 is a disc-shaped structure composed of a semicircular stainless steel plate and a semicircular stainless steel microporous perforated mesh plate; the stainless steel plate part adopts a 3mm thick 316 stainless steel plate, and the stainless steel microporous perforated mesh plate adopts a φ3mm316L stainless steel microporous perforated mesh plate;

[0043] The stainless steel plate parts and the stainless steel microporous perforated mesh parts of the upper and lower end covers 413 of the packing frame are arranged alternately, that is, the stainless steel plate part of the upper end plate is aligned with the stainless steel microporous perforated mesh part of the lower end plate, and the stainless steel microporous perforated mesh part of the upper end plate is aligned with the stainless steel plate part of the lower end plate;

[0044] The stainless steel plate parts and the stainless steel microporous perforated mesh parts of the adjacent end plates of the adjacent ozone catalyst packing units 41 in the ozone catalyst packing group are arranged relatively, that is, the stainless steel plate part of the upper end plate is aligned with the stainless steel plate part of the lower end plate, and the stainless steel microporous perforated mesh part of the upper end plate is aligned with the stainless steel microporous perforated mesh part of the lower end plate, so that the stainless steel plates of the top plate and the bottom plate play the role of baffles to prevent the sewage from forming a dead flow in the catalyst layer;

[0045] The ozone catalyst filler 411 is a high-salt resistant ozone catalyst.

[0046] In this embodiment, the water inlet pump 2, water inlet flow meter 3, chiller 6, ozone generator 7, intake ozone concentration detector 8, ozone micro-nano bubble generator 9, circulation pump 10, exhaust ozone concentration detector 11, and ozone exhaust destructor 12 are all conventional commercially available equipment.

[0047] Application Example 1

[0048] In this application example, the hydroquinone wastewater is prepared with: NaCl 100000mg / L, COD 1000mg / L, ozone dosage 600mg / L, and TOC removal rate ≥50% after 1 hour of reaction.

[0049] Application Example 2

[0050] In this application example, the test water is water-based drilling mud filtrate, TDS 67000mg / L, COD 5700mg / L, ozone dosage 5000mg / L, reaction time 1h, COD removal rate 47%.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0053] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles, characterized by: The invention comprises an ozone catalytic oxidation reactor (4), a raw water tank (1) connected to the ozone catalytic oxidation reactor (4), an ozone micro-nano bubble water supply mechanism and a water production tank (5); the ozone micro-nano bubble water supply mechanism comprises an ozone generator (7) and a micro-nano bubble generator (9) connected to each other.

2. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 1 is characterized by: A water inlet pump (2) and a water inlet flow meter (3) are arranged on the pipeline between the raw water tank (1) and the ozone catalytic oxidation reactor (4).

3. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 1 is characterized by: An intake ozone concentration detector (8) is arranged on the pipeline between the ozone generator (7) and the micro-nano bubble generator (9); and the ozone generator (7) is cooled by a chiller (6).

4. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 1 is characterized by: The ozone catalytic oxidation reactor (4) comprises a reactor shell (47) and an ozone catalyst packing group arranged in the reactor shell (47); the ozone catalyst packing group comprises a plurality of ozone catalyst packing units (41) arranged along a height direction.

5. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 4 is characterized by: A tail gas discharge port (45) is provided at the top of the reactor shell (47), and the tail gas discharge port (45) is connected to the ozone tail gas destroyer (12); A circulating water outlet (44) and an outlet (46) are provided on the upper side wall of the reactor shell (47); the circulating water outlet (44) is connected to the ozone micro-nano bubble generator (9), and a circulating pump (10) is provided between the two; the outlet (46) is connected to the water production tank (5); the circulating water outlet (44) and the outlet (46) are provided above the ozone catalyst packing group, and the horizontal position of the outlet (46) is higher than the horizontal position of the circulating water outlet (44); A raw liquid water inlet (42) and a circulating water inlet (43) are arranged on the lower side wall of the reactor shell (47); the raw liquid water inlet (42) is connected to the raw water tank (1); the raw liquid water inlet (42) and the circulating water inlet (43) are arranged below the ozone catalyst packing group, and the horizontal position of the circulating water inlet (43) is higher than the horizontal position of the raw liquid water inlet (42).

6. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 4 is characterized by: The ozone catalyst packing unit (41) comprises a packing frame and an ozone catalyst packing (411) loaded in the packing frame; the packing frame is a hollow cylindrical structure composed of a sleeve (412) and end covers (413) arranged at two ends of the sleeve (412); the end covers (413) and the sleeve (412) are connected by bolts.

7. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 6 is characterized by: The sleeve (412) is a φ3mm 316L stainless steel microporous perforated mesh plate; the end cover (413) is a disc-shaped structure composed of a semicircular stainless steel plate and a semicircular stainless steel microporous perforated mesh plate; the stainless steel plate part adopts a 3mm thick 316 stainless steel plate, and the stainless steel microporous perforated mesh plate adopts a φ3mm 316L stainless steel microporous perforated mesh plate.

8. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 6 is characterized by: The stainless steel plate parts and the stainless steel microporous perforated mesh plate parts of the two end covers (413) at the top and bottom of the filling frame are arranged alternately.

9. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 6 is characterized by: The stainless steel plate parts and the stainless steel microporous perforated mesh plate parts of adjacent end plates of adjacent ozone catalyst packing units (41) in the ozone catalyst packing group are arranged opposite to each other.

10. The high-salt organic waste liquid ozone catalytic oxidation system based on micro-nano bubbles according to claim 6 is characterized by: The ozone catalyst filler (411) is a high-salt resistant ozone catalyst.

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