Biochemical treatment device for organic wastewater of liquid crystal display panel

Abstract

The utility model discloses a biochemical treatment device for organic wastewater of a liquid crystal display panel, which comprises a reactor, porous aeration pipes are arranged on two opposite side walls of the reactor, and the porous aeration pipes are connected with an external aeration device; the porous aeration pipe comprises an aeration main pipe which extends vertically and a plurality of aeration branch pipes which are parallel to one another and extend transversely, and a plurality of aeration holes are formed in the aeration branch pipes; the reactor is filled with a porous filler and is provided with a fixed separation net for controlling the porous filler to be below the water surface at the initial stage of biofilm formation. According to the device disclosed by the utility model, on one hand, the reactor is in an aerobic environment by controlling the concentration of DO in the reactor, and meanwhile, an anoxic / anaerobic microenvironment can be constructed in filler pores, so that the thorough degradation of refractory organics such as tetramethylammonium hydroxide (TMAH) and a chelating agent in wastewater is realized; on the other hand, the fixed separation net is arranged in the reactor, so that the filler is in contact with wastewater and activated sludge at the beginning of the reaction, the biofilm culturing period of a biofilm on the filler is greatly shortened, and the reactor can be quickly started.

Description

TECHNICAL FIELD

[0001] The utility model relates to a biochemical treatment device for liquid crystal panel organic wastewater. BACKGROUND

[0002] In the production process of thin film transistor liquid crystal display (TFT-LCD), a large amount of pure water and organic reagents, including tetramethylammonium hydroxide (TMAH), dimethyl sulfoxide (DMSO), chelating agent and other substances, are needed, thereby generating a large amount of organic wastewater that is difficult to treat. As can be seen from the above, the liquid crystal panel organic wastewater contains a large amount of refractory organic matter, such as tetramethylammonium hydroxide (TMAH), chelating agent and other substances. When the concentration is high, such substances can easily cause the collapse of the aerobic biological system, and the metabolic products (such as formaldehyde, hydrogen peroxide, etc.) generated by them have biological toxicity, which can easily cause microorganisms to die or become inactive, so they are difficult to remove by simple aerobic biological treatment.

[0003] However, the existing biochemical treatment device for liquid crystal panel organic wastewater has many problems. For example, the traditional biochemical treatment device usually uses bottom aeration, which not only causes uneven aeration in the tank, but also has insufficient oxygen utilization rate. In addition, the biochemical treatment device using suspended filler for wastewater treatment often has problems such as slow biofilm formation speed and long debugging period during the debugging period. For example, patent CN117105403B discloses a biochemical treatment method for liquid crystal panel organic wastewater, which sets perforated pipe type aeration pipe and microporous aeration pipe at the bottom of the first aeration zone and the second aeration zone respectively for aeration, which can easily cause uneven distribution of dissolved oxygen on the vertical gradient of the reactor, thereby producing aeration dead angle, leading to a decrease in sludge activity and a decrease in wastewater treatment efficiency. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a biochemical treatment device for liquid crystal panel organic wastewater. On the one hand, the device can make the reactor in an aerobic environment by controlling the DO concentration in the reactor, while at the same time constructing an anoxic / anaerobic microenvironment in the pores of the filler, thereby achieving the complete degradation of refractory organic matter in the wastewater, such as tetramethylammonium hydroxide (TMAH) and chelating agent. On the other hand, by setting a fixed screen in the reactor, the filler can come into contact with wastewater and activated sludge at the beginning of the reaction, greatly shortening the biofilm formation period on the filler, and enabling the reactor to start quickly.

[0005] Technical solution: The biochemical treatment device for liquid crystal panel organic wastewater, comprising a reactor, two side walls of the reactor are provided with porous aeration pipes, the porous aeration pipes are connected with external aeration devices; the porous aeration pipe comprises a vertical aeration main pipe and a plurality of parallel and transversely extending aeration branch pipes, and a plurality of aeration holes are arranged on the aeration branch pipes; the reactor is filled with porous fillers, and a fixed screen is arranged below the water surface to control the porous fillers in the initial biofilm formation period.

[0006] The reason for using the porous filler is that: with the reaction, an aerobic environment can be constructed outside the filler due to the aeration effect, and an anoxic / anaerobic microenvironment can be constructed inside the filler due to the existence of the porous filler, so that nitrification and denitrification are realized in one reactor, and the biodegradation of refractory organic matter can be carried out through the anoxic / anaerobic microenvironment, and the degradation products can be further removed through aerobic reaction.

[0007] Among them, every 3-5cm of the aeration branch pipe is provided with an aeration hole to realize uniform aeration of the whole reactor.

[0008] Among them, the filling amount of the porous filler in the reactor is 10% of the volume of the reactor.

[0009] Among them, it also includes a PLC control box, and the reactor is also provided with a dissolved oxygen measuring instrument; the dissolved oxygen measuring instrument is connected with the PLC control box, and the dissolved oxygen in the reactor is always maintained at 2-5mg / L.

[0010] Among them, the fixed screen is composed of a screen and a support for supporting the screen, and the screen and the support are connected through the supporting structure on the support.

[0011] Among them, the pore size of the screen is smaller than the particle size of the porous filler, and is preferably 1-2mm.

[0012] Among them, it also includes a stirring blade arranged in the reactor.

[0013] Beneficial effects: compared with the prior art, the utility model has the following advantages: (1) the utility model discloses a fixed screen is arranged in the reactor, can make the filler contact wastewater and activated sludge at the beginning of reaction, solve the existing problems of long reactor starting time, low biofilm formation rate and poor removal efficiency of the existing device; (2) the utility model discloses a porous aeration pipe with a main pipe and multiple branch pipes is arranged on the left and right sides of the reactor, a microporous aeration head is arranged on every 3-5cm of the branch pipe, thereby realizing uniform aeration in the reactor, avoiding the problem of uneven vertical gradient aeration caused by arranging the aeration pipe at the bottom of the reactor in the conventional reactor, and avoiding the generation of dead angle of aeration in the reactor; (3) the utility model discloses by controlling the DO concentration in the reactor, the reactor can be in an aerobic environment, and an anoxic / anaerobic microenvironment can be constructed in the pores of the filler, thereby realizing the complete degradation of refractory organic matter such as tetramethylammonium hydroxide (TMAH) and chelating agent in wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure principle drawing of the utility model biochemical treatment device. DETAILED DESCRIPTION

[0015] As Figure 1 shown, the utility model discloses a biochemical treatment device for liquid crystal panel organic wastewater, including reactor 1, the two side walls of reactor 1 relative arrangement are equipped with porous aeration pipe 6, and porous aeration pipe 6 is connected with external aeration device 2;Porous aeration pipe 6 includes the aeration main pipe 61 of vertical extension and multiple aeration branch pipes 62 that are mutually parallel and extend horizontally, and is equipped with multiple aeration holes 11 on aeration branch pipe 62;In reactor 1, fill multiple porous fillers 8.

[0016] The density of the porous filler is 18g / L, and the weight is relatively light. When being put into the reactor 1, the filler 8 always floats above the wastewater within the initial 1-2 days, and it is difficult to present the phenomenon of turbulent with water flow, resulting in a long starting time, a low biofilm formation rate and a poor removal efficiency. The utility model discloses a fixed screen in the reactor 1. Within the initial reaction of 1-2 days, the screen 7 is arranged at 1 / 3-1 / 2 below the water surface, and the screen aperture is 1-2mm, which is smaller than the filler particle size (4-5mm). Therefore, the porous filler 8 is controlled below the water surface by the screen 7, so that the filler contacts the wastewater and activated sludge at the beginning of reaction, greatly shortens the biofilm formation period on the filler, and enables the reactor to be quickly started. When the filler can present the phenomenon of turbulent with water flow, the screen can be manually removed.

[0017] The utility model discloses a porous aeration pipe 6 sets two groups, respectively sticks on the reactor 1 opposite two sides side wall, and aeration main pipe 61 top is connected with aeration device 2 through the hose, the porous aeration pipe 6 is composed of a aeration main pipe 61 and a plurality of aeration branch pipes 62, and the plurality of aeration branch pipes 62 are parallelly arranged, and every 3~5cm is provided with a microporous aeration head (aeration hole) 11 on the aeration branch pipe 62, realizes the uniform aeration in the whole reactor 1, avoids the problem of the non-uniform vertical gradient aeration caused by setting the aeration pipe in the bottom in the conventional reactor, and avoids the generation of the aeration dead angle in the reactor.

[0018] The porous filler 8 is polyurethane material with uniform pores, and the volume of a single filler is 5mm 3 , the density is 18g / L, and the specific surface area is 1000m 2 / g, and the filling amount of the porous filler 8 in the reactor 1 is 10% of the volume of the reactor 1.

[0019] The utility model discloses a biochemical treatment device still includes PLC control box 3, and the reactor 1 still is equipped with dissolved oxygen measuring instrument 10, and dissolved oxygen measuring instrument 10 is connected with PLC control box 3, and the dissolved oxygen in the reactor is always maintained at 2~5mg / L. The dissolved oxygen measuring instrument 10 that can on-line monitoring dissolved oxygen is arranged in the reactor 1, and the dissolved oxygen measuring instrument 10 is connected with PLC control box 3, and the dissolved oxygen concentration (DO needs to maintain between 2~5mg / L) in the reactor 1 is controlled in real time, and PLC control box 3 is connected with power 5 through frequency converter 4, when the dissolved oxygen signal that dissolved oxygen measuring instrument 10 exports is higher than 5mg / L, and PLC control box 3 controls power 5 to disconnect through frequency converter 4, causes aeration device 2 to stop aeration, when the dissolved oxygen signal that dissolved oxygen measuring instrument 10 exports is lower than 2mg / L, and PLC control box 3 controls power 5 to reconnect through frequency converter 4, and aeration device 2 opens aeration, to realize the dissolved oxygen in the reactor 1 always maintained between 2~5mg / L.

[0020] As the liquid crystal panel organic wastewater contains a large amount of refractory organic matter, such as tetramethyl ammonium hydroxide (TMAH), chelating agent and the like, when the concentration is high, the substances are easy to cause the collapse of the aerobic biological system, and the metabolic products (such as formaldehyde, hydrogen peroxide and the like) generated by the substances have biological toxicity, and are easy to cause the death or inactivation of microorganisms, so that the substances are difficult to be removed by pure aerobic biological treatment; the device is filled with porous filler 8 in the reactor 1, as the reaction proceeds, the aerobic environment is formed in the reactor 1, the anoxic / anaerobic microenvironment of the attached biofilm is formed in the porous filler 8, the refractory organic matter can be biodegraded through the anoxic / anaerobic microenvironment, and the degradation products can be further removed through aerobic reaction (such as TMAH can release ammonium ions through anaerobic environment, and the ammonia nitrogen formed can be further removed through the aerobic environment in the reactor). When the DO concentration in the reactor 1 is too high, the activated sludge is easy to be broken and digested, and the anoxic / anaerobic microenvironment in the pores of the filler 8 is easy to be destroyed, so that the refractory organic matter is difficult to be biodegraded through the anoxic / anaerobic reaction, and at the same time, when the DO concentration in the reactor 1 is too low, the overall anaerobic environment is easy to be formed, and the ammonia nitrogen and the like are difficult to be removed, therefore, the reactor 1 needs to be maintained at a certain DO level, and in the device, the DO level needs to be maintained at 2-5 mg / L, and if the aeration state is maintained all the time, the DO concentration in the reactor 1 will gradually increase with the aeration until saturation.

[0021] The biochemical treatment device also comprises a fixed separation net for controlling the porous filler 8 below the water surface in the initial biofilm formation period, which is composed of the separation net 7 and four supports 12 supporting the separation net, and the separation net 7 is connected with the support 12 through the support structure 13 on the support.

[0022] The reactor 1 is also provided with stirring blades 14, and the stirring rate is 100 rpm; the reactor 1 also comprises a water inlet pipe 15, a water inlet pump 16, a water outlet pipe 17 and a water outlet pump 18; and the reactor 1 is also connected with an external acid-alkali dosing device 9.

Claims

1. A biochemical treatment device for organic wastewater from liquid crystal panels, characterized in that: The application relates to a reactor (1) which is provided with a plurality of porous aeration pipes (6) on two oppositely arranged side walls, and the porous aeration pipes (6) are connected with external aeration devices (2); the porous aeration pipe (6) comprises a vertically extending aeration main pipe (61) and a plurality of mutually parallel and transversely extending aeration branch pipes (62), and a plurality of aeration holes (11) are arranged on the aeration branch pipe (62); the reactor (1) is filled with porous fillers (8) and is provided with a screen (7) for controlling the porous fillers (8) below the water surface in the initial biofilm formation period.

2. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 1, characterized in that: The aeration branch pipe (62) is provided with an aeration hole (11) every 3-5 cm.

3. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 1, characterized in that: The filling amount of the porous fillers (8) in the reactor (1) is 10% of the volume of the reactor (1).

4. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 1, characterized in that: The application further comprises a PLC control box (3), and the reactor (1) is further provided with a dissolved oxygen measuring instrument (10); the dissolved oxygen measuring instrument (10) is connected with the PLC control box (3).

5. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 1, characterized in that: The fixed screen is composed of the screen (7) and a support (12) for supporting the screen (7), and the screen (7) is connected with the support (12) through a supporting structure (13) on the support (12).

6. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 5, characterized in that: The aperture of the screen (7) is smaller than the particle size of the porous fillers (8).

7. The biochemical treatment device for liquid crystal panel organic wastewater according to claim 1, characterized in that: The application further comprises stirring blades (14) arranged in the reactor (1).

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