Advanced treatment device for degradation-resistant organic wastewater

Abstract

The utility model discloses an advanced treatment device for degradation-resistant organic wastewater, and belongs to the field of sewage treatment. According to the utility model, a set of miniaturized test device is designed aiming at degradation-resistant organic wastewater, the whole structure is simple, ozone preparation and wastewater treatment are integrally designed, and a miniaturized wastewater treatment test can be very conveniently carried out. The reaction column for catalytic ozonation adopts a sectional structure and is connected through a flange, so that a detachable structure is realized on the premise of not influencing a normal test, the internal catalyst filler can be very conveniently replaced, and the suitability of different wastewater and a catalyst can be better researched. Besides, the catalytic ozonation column and the biological aerated filter column are matched for use, aromatic compounds in the refractory organic wastewater are subjected to chain scission and ring opening through the catalytic ozonation column, the biodegradability of the wastewater is improved, and the refractory organic wastewater is further removed through microorganisms on a filter material through the biological aerated filter column.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, and specifically relates to a device for deep treatment of difficult-to-degrade organic wastewater. Background Art

[0002] Ozone catalytic oxidation technology is an efficient wastewater deep treatment technology. Compared with ozone as a single oxidant, the hydroxyl radical (·OH) formed by ozone under the action of a catalyst has a higher reaction rate with organic matter and stronger oxidizing power, and can oxidize almost all organic matter. The catalyst can catalyze ozone to directly oxidize organic matter in water into CO2 and H2O, or oxidize and decompose large molecular organic matter into small molecules, making it easier to degrade.

[0003] In actual wastewater treatment, ozone catalytic oxidation technology has the advantages of fast reaction speed, no secondary pollution, short process flow, and low investment and operating costs. It can also be widely used in fields such as deep wastewater treatment and biochemical pretreatment. The treated wastewater can meet the prescribed wastewater treatment standards.

[0004] In addition, the technologies of ozone oxidation and ozone catalytic oxidation are relatively mature, and the processes are very stable. There are already a large number of related sewage treatment equipment available on the market, and they are also equipped with various catalysts for use.

[0005] Precisely because of the relatively mature technology, the varieties of ozone catalysts have become very rich. The more common ozone catalysts include expanded clay or clay catalysts, activated carbon catalysts, silicon-aluminum composite catalysts, activated alumina catalysts, impregnation catalysts and blended catalysts.

[0006] However, faced with many types of catalysts and different sewage plant tailwaters, there is no good miniaturized test device to test the catalytic oxidation effect. This makes it cumbersome to further study ozone catalytic oxidation technology or screen ozone catalyst varieties according to sewage types. Directly using industrial finished equipment for testing will undoubtedly cause a lot of resource waste, and because the equipment is too large, it will also cause the test cycle to be prolonged.

[0007] Therefore, a new scheme that is more suitable for small-scale experiments in the field of ozone catalytic oxidation is needed. Utility Model Content

[0008] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a device for deep treatment of difficult-to-degrade organic wastewater.

[0009] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0010] A device for deep treatment of refractory organic wastewater comprises an ozone generator, an oxygen source, a bracket, an ozone catalytic oxidation column, a tail gas destruction device and an aerated biological filter column. The oxygen source, the ozone generator and the ozone catalytic oxidation column are all arranged on the bracket. The oxygen source, the ozone generator and the ozone catalytic oxidation column are connected in sequence. The ozone catalytic oxidation column is divided into a water inlet and air inlet section, a main reaction section and a water outlet and air outlet section from bottom to top. The sections of the ozone catalytic oxidation column are detachably connected. The side wall of the water inlet and air inlet section is provided with a water inlet and an air inlet, the water outlet and air outlet section is provided with a water outlet and an air outlet, the main reaction section is provided with a catalyst filler, the side wall of the main reaction section is provided with an observation window, the tail gas destruction device is provided above the air outlet of the ozone catalytic oxidation column, and the aerated biological filter column is connected to the water outlet of the ozone catalytic oxidation column.

[0011] The sections of the ozone catalytic oxidation column are connected by flanges, and the flange connection portion of the ozone catalytic oxidation column is provided with a sealing gasket.

[0012] An aeration plate is arranged at the bottom of the water inlet and air inlet section, and the air inlet is arranged at the bottom of the water inlet and air inlet section, and the air inlet is connected to the aeration plate.

[0013] The water inlet is arranged above the aeration plate, and there are multiple water inlets, which are evenly arranged around the outer side of the water inlet and air inlet section.

[0014] The air outlet is arranged at the top of the water outlet and air outlet section, and there are a plurality of water outlets, which are evenly arranged around the outer side of the water outlet and air outlet section.

[0015] The air inlet, water inlet, air outlet and water outlet are all provided with control valves.

[0016] Baffles are arranged at both upper and lower ends of the main reaction section, and a plurality of water holes are evenly arranged on the baffles.

[0017] The baffle is arranged at the connection between the sections of the ozone catalytic oxidation column, and the baffle is fixed by a flange.

[0018] The aerated biological filter column includes a buffer water distribution area, a filter material area and a water outlet area. The buffer water distribution area is arranged at the bottom of the aerated biological filter column, the filter material area is above the buffer water distribution area, and the water outlet area is above the filter material area. The filter material area includes a supporting layer and a filter material layer. The filter material layer is arranged above the supporting layer, and a plurality of observation windows are opened on the side of the filter material area.

[0019] The top of the water outlet area is an open structure, and the interior of the water outlet area includes an overflow weir and an outlet channel. The overflow weir is arranged inside the outlet channel and is connected to the filter material area, and the outlet channel is arranged outside the overflow weir and is connected to the outer shell of the filter material area. A layer of horizontal fixed plate is sealed inside the overflow weir, and a baffle with a height higher than the overflow weir is arranged in the center of the fixed plate. An outlet is arranged at the bottom of the outlet channel.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model designs a miniaturized test device for difficult-to-degrade organic wastewater. The overall structure is simple, and the preparation of ozone and simulated wastewater treatment are integrated, so it is very convenient to conduct miniaturized wastewater treatment tests. The reaction column for ozone catalytic oxidation adopts a segmented structure, which is connected by flanges. It realizes a detachable structure without affecting the normal test. The internal catalyst filler can be replaced very conveniently, and the compatibility of different wastewaters and catalysts can be better studied. In addition, multiple water inlets are provided, and the oxidation effect of ozone mixed with other oxidants can also be studied. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the overall structural front view of the utility model;

[0023] Figure 2 It is a top view of the overall structure;

[0024] Figure 3 This is the main view of the ozone catalytic oxidation column;

[0025] Figure 4 It is a cross-sectional view of an ozone catalytic oxidation column;

[0026] Figure 5 This is a schematic diagram of the ozone catalytic oxidation column looking down at the nozzle;

[0027] Figure 6 This is the main view of the ozone exhaust destruction tank;

[0028] Figure 7 This is a cross-sectional view of the ozone exhaust destruction tank;

[0029] Figure 8 This is the main view of the aerated biological filter column;

[0030] Fig. 9 This is a cross-sectional view of an aerated biofilter column;

[0031] In the figure: 1. bracket; 2. oxygen cylinder; 3. ozone generator; 4. ozone catalytic oxidation column; 5. water inlet; 6. air inlet; 7. water outlet; 8. air outlet; 9. catalyst filler; 10. baffle; 11. aeration disk; 12. observation window; 13. tail gas destruction tank; 14. tail gas discharge port; 15. tail gas treatment filler; 16. aerated biological filter column; 17. outlet area baffle; 18. overflow weir; 19. outlet channel; 20. supporting layer; 21. filter material layer. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with specific embodiments.

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a miniaturized test device for treating refractory organic wastewater, which mainly includes a bracket 1, an air source component, an ozone generator 3, an ozone catalytic oxidation column 4 and an aerated biological filter column 16.

[0034] The support 1 is used as the base of the whole device. The air source component is arranged on the left side of the support 1, which mainly provides reaction raw materials for the ozone generator 3, and then provides ozone for the ozone catalytic oxidation column 4 through the ozone generator 3. After the wastewater is oxidized by the ozone catalytic oxidation column 4, the treated wastewater can be passed into the aerated biological filter column 16 to further observe the effect of ozone catalytic oxidation on wastewater treatment. In this embodiment, the air source component used is an oxygen cylinder 2, and the placement of each part is as shown in FIG. Figure 2 shown.

[0035] The specific structure of the ozone catalytic oxidation column 4 is as follows Figure 3 and Figure 4 As shown, the ozone catalytic oxidation column 4 is a three-section structure, which includes a water inlet and air inlet section, a main reaction section, and a water outlet and air outlet section. The water inlet and air inlet section is arranged at the bottom of the entire ozone catalytic oxidation column 4, the main reaction section is arranged above the water inlet and air inlet section, and the water outlet and air outlet section is arranged above the main reaction section. Each section is connected by a flange, and a leak-proof gasket is arranged between each flange connection section. Since the wastewater contains various organic matter and the temperature fluctuates greatly during the entire ozone catalytic oxidation reaction, the selection conditions for the gasket are relatively high. The gasket used in this embodiment is a polytetrafluoroethylene (Teflon) gasket.

[0036] The water and air inlet section at the bottom is provided with a plurality of legs for supporting the entire ozone catalytic oxidation column 4 .

[0037] The side wall of the water inlet and air inlet section is provided with a water inlet 5 and an air inlet 6. An aeration plate 11 is provided on the inner side of the bottom of the water inlet and air inlet section. The aeration plate 11 is connected to the air inlet 6 provided on the outer side of the bottom of the water inlet and air inlet section. The introduced gas enters the aeration plate 11 through the air inlet 6, and then is evenly introduced into the liquid of the ozone catalytic oxidation column 4 through the aeration plate 11 in the form of tiny bubbles. In the present embodiment, the aeration plate 11 is a microporous pure titanium aeration plate with excellent corrosion resistance.

[0038] The water inlet 5 is arranged around the side wall of the water inlet and air inlet section, and the overall height of the water inlet 5 is higher than the aeration plate 11. The water inlets 5 are arranged at the same distance, and each is equipped with a valve for controlling opening and closing. In this embodiment, there are three water inlets 5, so they are arranged at an angle of 120 degrees on the same plane, and the pipes inside each water inlet 5 extend to the center of the ozone catalytic oxidation column 4.

[0039] The main reaction part of the ozone catalytic oxidation column 4 is located in the middle part thereof. Baffles 10 are arranged at both ends of the main reaction part. Many water holes are evenly arranged on the baffles 10. The main function of the baffles 10 is to carry the catalyst filler 9 and prevent the catalyst filler 9 from moving to the water inlet and air inlet section and the water outlet and air outlet section. The wastewater introduced can pass through the baffles 10 normally.

[0040] The baffle 10 is not arranged inside the main reaction part, but is arranged at the flange connection part between the main reaction section and the water inlet and air inlet section and the water outlet and air outlet section. The outer circle size of the baffle 10 is the same as the size of the connecting flange, and a through hole is also reserved for the connecting flange bolts to pass through. Gaskets are arranged between the upper and lower surfaces of the baffle 10 and each section of the ozone catalytic oxidation column 4.

[0041] In order to better observe the internal wastewater flow and the catalytic effect of the catalyst filler 9, multiple observation windows 12 are evenly arranged on the side wall of the main reaction section for observing the reaction conditions inside the main reaction section.

[0042] The water outlet and gas outlet section is located in the upper section of the main reaction section, and mainly includes two parts, namely, the water outlet 7 and the gas outlet 8. Other parts are all closed structures. The water outlet 7 is also provided with multiple parts, and they are arranged at the same interval. In this embodiment, the number of water outlets 7 is the same as that of water inlets 5, and both are provided with three and arranged at an angle of 120 degrees. The specific arrangement diagram is shown in FIG. Figure 5 The top view of the nozzle is shown in the schematic diagram.

[0043] The air outlet 8 is arranged at the top center of the ozone catalytic oxidation column 4, and the water outlet 7 and the air outlet 8 are also provided with valves for controlling their opening and closing.

[0044] A tail gas destruction tank 13 is provided above the gas outlet 8. The tail gas destruction tank 13 is installed through a support rod provided on the bracket 1. A tail gas inlet and a valve are provided at the lower portion of the tail gas destruction tank 13. The tail gas inlet is connected to the gas outlet 8 of the ozone catalytic oxidation column through a pipe. A tail gas discharge port 14 is provided at the top of the tail gas destruction tank 13 to discharge the treated tail gas from the top. The inside of the tail gas destruction tank 13 is filled with tail gas treatment filler 15. The top of the tail gas destruction tank 13 is also connected to the tank body by a flange to connect the cover plate, so that the cover plate can be opened to fill and replace the tail gas treatment filler 15. Its specific structure is as follows: Figure 6 and Figure 7 shown.

[0045] In order to better cooperate with the experiment and further observe the effect of ozone catalytic oxidation, after the wastewater is treated, the wastewater can be directly passed into the aerated biological filter column 16 arranged on the side of the ozone catalytic oxidation column 4 for observation. The specific structure of the aerated biological filter column 16 is as follows: Figure 8 and Fig. 9 As shown, it is mainly divided into buffer water distribution area, filter material area and water outlet area.

[0046] The structure of the aerated biological filter column 16 is a buffer water distribution area, a filter material area and a water outlet area from bottom to top, and its various components are also connected by flanges. Its overall structure is an upward flow aerated biological filter column. The buffer water distribution area at the bottom is provided with a water inlet, a backwash water inlet and a backwash air inlet. The treated wastewater flowing out of the water outlet 7 of the ozone catalytic oxidation column 4 is input from the water inlet of the buffer water distribution area, and the backwash water inlet and the backwash air inlet are used to flush the inside of the aerated biological filter column 16 after each test.

[0047] Above the buffer water distribution area is the filter material area, which is divided into two parts, namely a supporting layer 20 and a filter material layer 21. The supporting layer 20 is located at the lower part of the filter material area and in contact with the buffer water distribution area. At the flange where the supporting layer 20 and the buffer water distribution area are connected, a baffle with evenly distributed water holes is provided, the diameter of which is the same as that of the flange part, and is fixed between the supporting layer 20 and the buffer water distribution area through the flange.

[0048] The supporting layer 20 and the filter material layer 21 are both parts for laying filter materials. The difference is that the supporting layer 20 is mainly used for laying fillers such as pebbles, whose average particle size is larger and only occupies a small part of the height area at the bottom of the entire filter material area, while the filter material layer 21 adopts lightweight filter materials, whose average particle size is smaller and occupies most of the height area of ​​the entire filter material area. They are combined to physically adsorb the wastewater flowing from bottom to top. And in order to better aerate and sample, an aeration pipe arranged around the outside of the supporting layer 20 is arranged at the position of the supporting layer 20, and the part where the aeration pipe contacts the supporting layer 20 is staggered to open holes for aeration, and a plurality of sampling ports for sampling are opened on the side wall of the filter material layer 21, and a plurality of observation windows 12 are also opened on the side wall of the filter material layer 21 for users to observe the internal situation.

[0049] The water outlet area located above the filter material area also includes two parts. The top of the water outlet area is an open structure, which is divided into an internal overflow weir 18 and an outlet channel 19 arranged around the outside of the overflow weir 18. The bottom of the overflow weir 18 is connected to the top of the filter material area. The water flows upward from the filter material area and continues to flow upward directly from the bottom of the overflow weir 18.

[0050] A layer of horizontal baffle is sealed inside the overflow weir 18, and a hollow cylindrical water outlet baffle 17 is arranged in the center of the baffle, which is higher than the overflow weir 18. When the water flows upward from the bottom of the overflow weir 18, the water flow is blocked by the lower half of the baffle, and then overflows from the center of the water outlet baffle 17, and the overflowed water flows back to the upper part of the baffle in the overflow weir 18 along the outer wall of the water outlet baffle 17. As the water flows continuously, impurities are further precipitated in the groove formed by the overflow weir 18 and its baffle, and the clarified liquid above overflows from the overflow weir 18, flows into the water outlet channel 19 outside the overflow weir 18, and finally flows out from the water outlet pipe at the bottom of the water outlet channel 19.

[0051] The utility model designs a miniaturized test device for the deep treatment of refractory wastewater, and the overall structure is simple, and the preparation of ozone and the simulated wastewater treatment are integrated, so that the test of miniaturized wastewater treatment can be carried out very conveniently. And through the split design of the ozone catalytic oxidation column 4, the catalyst filler 9 can be replaced very conveniently, and the influence of different catalysts on the wastewater treatment effect can be studied, and the design of multiple inlets and outlets can add other liquids to carry out the study of composite catalytic oxidation in the process of wastewater treatment, such as one water inlet pipe passes through the wastewater to be treated, and the other passes through hydrogen peroxide, so as to carry out the composite catalysis of ozone and hydrogen peroxide. The design of multiple water outlets can be used for water outlet guidance, such as connecting one water outlet to the aerated biological filter column 16, and the other water outlet is connected to the water storage tank where the wastewater is originally stored. When studying the multiple cycles of catalytic oxidation treatment of wastewater, the water outlet valve connected to the aerated biological filter column 16 can be closed, so that the wastewater can flow back to the wastewater storage tank for multiple treatments, and finally pass into the aerated biological filter column 16.

[0052] In addition, there are many other types of experiments that can be tried, and the purpose of the utility model is to provide a solution for conducting ozone catalytic oxidation + aerated biological filter small-scale experiments more efficiently and conveniently.

Claims

1. A device for deep treatment of refractory organic wastewater, comprising an ozone generator and an oxygen source, characterized in that: It also includes a bracket, an ozone catalytic oxidation column, a tail gas destruction device and an aerated biological filter column. The oxygen source, the ozone generator and the ozone catalytic oxidation column are all arranged on the bracket. The oxygen source, the ozone generator and the ozone catalytic oxidation column are connected in sequence. The ozone catalytic oxidation column is divided into a water inlet and air inlet section, a main reaction section and a water outlet and air outlet section from bottom to top. The sections of the ozone catalytic oxidation column are detachably connected. The side wall of the water inlet and air inlet section is provided with a water inlet and an air inlet, and the water outlet and air outlet section is provided with a water outlet and an air outlet. Catalyst filler is provided in the main reaction section, and an observation window is provided on the side wall of the main reaction section. A tail gas destruction device is provided above the air outlet of the ozone catalytic oxidation column, and the aerated biological filter column is connected to the water outlet of the ozone catalytic oxidation column.

2. The device for deep treatment of refractory organic wastewater according to claim 1, characterized in that: The various sections of the ozone catalytic oxidation column are connected via flanges, and the flange connection portion of the ozone catalytic oxidation column is provided with a sealing gasket.

3. The device for deep treatment of refractory organic wastewater according to claim 1, characterized in that: An aeration plate is arranged at the bottom of the water inlet and air inlet section, and the air inlet is arranged at the bottom of the water inlet and air inlet section, and the air inlet is connected to the aeration plate.

4. A device for deep treatment of refractory organic wastewater according to claim 3, characterized in that: The water inlet is arranged above the aeration plate, and there are multiple water inlets, which are evenly arranged around the outer side of the water inlet and air inlet section.

5. The device for deep treatment of refractory organic wastewater according to claim 1, characterized in that: The air outlet is arranged at the top of the water outlet and air outlet section, and there are a plurality of water outlets, which are evenly arranged around the outer side of the water outlet and air outlet section.

6. A device for deep treatment of refractory organic wastewater according to claim 4 or 5, characterized in that: The air inlet, water inlet, air outlet and water outlet are all provided with control valves.

7. The device for deep treatment of refractory organic wastewater according to claim 1, characterized in that: Baffles are arranged at both upper and lower ends of the main reaction section, and a plurality of water holes are evenly arranged on the baffles.

8. The device for deep treatment of refractory organic wastewater according to claim 7, characterized in that: The baffle is arranged at the connection between the sections of the ozone catalytic oxidation column, and the baffle is fixed by a flange.

9. The device for deep treatment of refractory organic wastewater according to claim 1, characterized in that: The aerated biological filter column includes a buffer water distribution area, a filter material area and a water outlet area. The buffer water distribution area is arranged at the bottom of the aerated biological filter column, the filter material area is above the buffer water distribution area, and the water outlet area is above the filter material area. The filter material area includes a supporting layer and a filter material layer. The filter material layer is arranged above the supporting layer, and a plurality of observation windows are opened on the side of the filter material area.

10. The device for deep treatment of refractory organic wastewater according to claim 9, characterized in that: The top of the water outlet area is an open structure, and the interior of the water outlet area includes an overflow weir and an outlet channel. The overflow weir is arranged inside the outlet channel and is connected to the filter material area, and the outlet channel is arranged outside the overflow weir and is connected to the outer shell of the filter material area. A layer of horizontal fixed plate is sealed inside the overflow weir, and a baffle with a height higher than the overflow weir is arranged in the center of the fixed plate. An outlet is arranged at the bottom of the outlet channel.

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