CN212833340U - Waste water treatment device is used in N-methyl pyrrolidone production - Google Patents

Abstract

The utility model discloses a waste water treatment device is used in N-methyl pyrrolidone production, including the header tank, the surface of header tank is provided with the water inlet, the side-mounting of header tank has first water pump, first water pump has UASB reactor through water piping connection, UASB reactor has biochemical case through water piping connection, the side-mounting of biochemical case has the second water pump, the second water pump has flocculation tank through water piping connection, flocculation tank's surface mounting has the drain pipe, the one end of drain pipe is connected with the rose box, the surface mounting of drain pipe has the solenoid valve. The treatment device can effectively treat the wastewater to meet the discharge requirement through the integrated treatment of the UASB reactor, the biochemical box, the flocculation tank and the filter box; sludge generated by wastewater flocculation is discharged downwards into the primary A/O biochemical cavity and the secondary A/O biochemical cavity through the shunt pipe, so that the concentration of the sludge can be improved.

Description

Waste water treatment device is used in N-methyl pyrrolidone production

Technical Field

The utility model belongs to the technical field of waste water treatment equipment, specifically be a waste water treatment device is used in N-methyl pyrrolidone production.

Background

The existing N-methyl pyrrolidone production device adopts a 1, 4-butanediol gas phase dehydrogenation process to prepare gamma-butyrolactone, the gamma-butyrolactone is synthesized with methylamine to prepare the N-methyl pyrrolidone, and NMP has wide market prospect as a lithium ion battery solvent, medicine, dye and insulating material.

The process section of the NMP production device for generating the wastewater mainly comprises a methylamine process section, a crude NMP recovery process section and a tetrahydrofuran process section, and pollutants in the wastewater discharged by the production device are mainly COD and ammonia nitrogen. The method for removing ammonia nitrogen generally comprises a struvite crystallization method, a chemical precipitation method, an air stripping method, an electrocatalytic oxidation method, an ultrasonic method, an anaerobic ammonia oxidation method and the like, but the methods have the problems of medicament addition, secondary pollution, complex operation management, difficult engineering application, high equipment cost investment and the like.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wastewater treatment device is used in N-methyl pyrrolidone production to solve the problem of waste water treatment difficulty.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a waste water treatment device is used in N-methyl pyrrolidone production, includes the header tank, the surface of header tank is provided with the water inlet, the side-mounting of header tank has first water pump, first water pump has UASB reactor through water piping connection, and the waste water of discharging into in the UASB reactor turns into marsh gas through the organic matter of reaction in with the waste water, reduces the COD of anaerobism effluent, UASB reactor has biochemical case through the water piping connection, the side-mounting of biochemical case has the second water pump, the second water pump has flocculation tank through water piping connection, the surface mounting of flocculation tank has the drain pipe, the one end of drain pipe is connected with the rose box, the surface mounting of drain pipe has the solenoid valve, and solenoid valve control drain pipe goes out water.

Preferably, the filter screen is installed to the inboard of header tank, and lithium cell waste water enters into the header tank from the water inlet, and the thick impurity of passing through the filter screen filters the thick impurity in the waste water earlier.

Preferably, the upper end of the UASB reactor is provided with a biogas collector, the UASB reactor has an operating temperature of 35-38 ℃, the water collecting tank discharges waste water into the UASB reactor through the first water pump, organic matters in the waste water are converted into biogas through reaction, COD of anaerobic effluent is reduced, and the generated biogas is collected through the biogas collector.

Preferably, a first-level A/O biochemical cavity and a second-level A/O biochemical cavity are arranged on the inner side of the biochemical box, a communicating pipe is arranged between the first-level A/O biochemical cavity and the second-level A/O biochemical cavity, when wastewater passes through the first-level A/0 biochemical cavity, nitrifying bacteria oxidize ammonia nitrogen into nitrate nitrogen in an aerobic state, nitrified mixed liquid is in the first-level A/0 biochemical cavity, denitrifying bacteria reduce the nitrate nitrogen into nitrogen in an anoxic state, then the nitrogen enters the second-level A/0 biochemical cavity through the communicating pipe, the same nitrification and denitrification reactions as those in the first-level A/0 biochemical cavity also occur, and the ammonia nitrogen in effluent is reduced to reach the standard.

Preferably, the inboard surface mounting of flocculation tank has the motor, and the pivot fixedly connected with actuating lever of motor, the surface of actuating lever are provided with auger delivery oar and stirring leaf, reach the water that goes out water ammonia nitrogen requirement, through in the second water pump suction flocculation tank, add the flocculating agent in the flocculation tank and then drive the actuating lever through the motor and utilize auger delivery oar and stirring leaf to stir water, improve the flocculation effect of water.

Preferably, the lower extreme of flocculation tank is provided with the shunt tubes, and the mud outlet of shunt tubes is connected with biochemical case, and the mud outlet of shunt tubes is located the biochemical chamber of one-level AO and second grade AO upper end respectively, through opening the mud discharging valve, then driving motor drives actuating lever and screw conveyor oar and rotates, can discharge the inside mud that deposits of flocculation tank into the biochemical intracavity of one-level AO and second grade AO and be used for increasing the biochemical intracavity sludge concentration of one-level AO and second grade AO, and the surface of shunt tubes is provided with the mud discharging valve.

Preferably, the inside of rose box is provided with the active carbon, the surface of rose box is provided with the drain valve, and the play water after flocculation tank flocculation and precipitation gets into the rose box that contains the active carbon in, filters through the active carbon and absorbs difficult biodegradable pollutant in the effluent absorption, ensures that the effluent is discharge up to standard.

Compared with the prior art, the beneficial effects of the utility model are that: the treatment device can effectively treat the wastewater to meet the discharge requirement through the integrated treatment of the UASB reactor, the biochemical box, the flocculation tank and the filter box; sludge generated by wastewater flocculation is discharged downwards into the primary A/O biochemical cavity and the secondary A/O biochemical cavity through the shunt pipe, so that the concentration of the sludge can be improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1 water collecting tank, 11 filter screens, 12 first water pumps, 13 water inlets, 2UASB reactors, 21 biogas collectors, 3 biochemical tanks, 31 first-stage A/O biochemical chambers, 32 second-stage A/O biochemical chambers, 33 communicating pipes, 34 second water pumps, 4 flocculation tanks, 41 motors, 42 driving rods, 43 stirring blades, 44 spiral conveying paddles, 45 electromagnetic valves, 46 drain pipes, 47 shunt pipes, 48 mud discharge valves, 5 filter tanks, 51 activated carbon and 52 drain valves.

Detailed Description

Referring to fig. 1, the wastewater treatment device for N-methylpyrrolidone production comprises a water collection tank 1, a water inlet 13 is formed in the surface of the water collection tank 1, a first water pump 12 is installed on the side surface of the water collection tank 1, the first water pump 12 is connected with a UASB reactor 2 through a water pipe, organic matters in wastewater discharged into the UASB reactor 2 are converted into methane through reaction, COD of anaerobic effluent is reduced, the UASB reactor 2 is connected with a biochemical tank 3 through a water pipe, a second water pump 34 is installed on the side surface of the biochemical tank 3, the second water pump 34 is connected with a flocculation tank 4 through a water pipe, a drain pipe 46 is installed on the surface of the flocculation tank 4, a filter tank 5 is connected to one end of the drain pipe 46, an electromagnetic valve 45 is installed on the surface of the drain pipe 46, and the electromagnetic valve 45.

Referring to fig. 1, a filter screen 11 is installed on the inner side of a water collection tank 1, lithium battery production wastewater enters the water collection tank 1 from a water inlet 13, and coarse impurities in the wastewater are filtered through coarse filtration of the filter screen 11.

Referring to fig. 1, a biogas collector 21 is installed at the upper end of the UASB reactor 2, the UASB reactor 2 operates at 35 to 38 degrees, organic substances in wastewater discharged into the UASB reactor 2 from the water collection tank 1 through the first water pump 12 are converted into biogas through reaction, the COD of anaerobic effluent is reduced, and the generated biogas is collected by the biogas collector 21.

Referring to fig. 1, a primary a/O biochemical chamber 31 and a secondary a/O biochemical chamber 32 are arranged inside a biochemical box 3, a communicating pipe 33 is arranged between the primary a/O biochemical chamber 31 and the secondary a/O biochemical chamber 32, when wastewater passes through the primary a/0 biochemical chamber 31, nitrifying bacteria oxidize ammonia nitrogen into nitrate nitrogen in an aerobic state, nitrified mixed liquid is in the primary a/0 biochemical chamber 31, denitrifying bacteria reduce the nitrate nitrogen into nitrogen in an anoxic state, and then the nitrogen enters the secondary a/0 biochemical chamber 32 through the communicating pipe 33 to perform the same nitrification and denitrification reactions as those in the primary a/0 biochemical chamber 31, so that the ammonia nitrogen in the effluent is reduced to meet the standard.

Referring to fig. 1, a motor 41 is installed on the inner side surface of the flocculation tank 4, a driving rod 42 is fixedly connected to a rotating shaft of the motor 41, a spiral conveying paddle 44 and a stirring blade 43 are arranged on the surface of the driving rod 42, water meeting the ammonia nitrogen requirement of the effluent is pumped into the flocculation tank 4 through the second water pump 34, a flocculating agent is added into the flocculation tank 4, then the motor 41 drives the driving rod 42 to stir the water through the spiral conveying paddle 44 and the stirring blade 43, and the flocculation effect of the water is improved.

Referring to fig. 1, a diversion pipe 47 is arranged at the lower end of the flocculation tank 4, a sludge outlet of the diversion pipe 47 is connected with the biochemical tank 3, the sludge outlet of the diversion pipe 47 is respectively positioned at the upper ends of the primary a/O biochemical cavity 31 and the secondary a/O biochemical cavity 32, the sludge discharge valve 48 is opened, then the driving motor 41 drives the driving rod 42 and the spiral conveying paddle 44 to rotate, so that sludge precipitated inside the flocculation tank 4 can be discharged into the primary a/O biochemical cavity 31 and the secondary a/O biochemical cavity 32 for increasing the sludge concentration in the primary a/O biochemical cavity 31 and the secondary a/O biochemical cavity 32, and the sludge discharge valve 48 is arranged on the surface of the diversion pipe 47.

Referring to fig. 1, activated carbon 51 is arranged inside the filter box 5, a drain valve 52 is arranged on the surface of the filter box 5, effluent after flocculation and precipitation in the flocculation tank 4 enters the filter box 5 containing the activated carbon 51, and the effluent is filtered by the activated carbon 51 to adsorb pollutants difficult to biodegrade, so that the effluent is guaranteed to be discharged up to the standard.

The working principle of the scheme is as follows: the wastewater is collected in the water collection tank 1, then large-particle impurities are filtered through the filter screen 11, then the wastewater is pumped into the UASB reactor 2 through the first water pump to convert organic matters in the wastewater into methane, COD (chemical oxygen demand) of anaerobic effluent is reduced, the produced methane is upwards discharged into the methane collector 21, effluent after the reaction of the UASB reactor 2 flows into the primary A/O biochemical cavity 31 in the biochemical tank 3, nitrobacteria oxidize ammonia nitrogen into nitrate nitrogen in the aerobic state in the primary A/O biochemical cavity 31, the denitrifying bacteria reduce the nitrate nitrogen into nitrogen in the anoxic state of mixed liquid in the primary A/O biochemical cavity 31 after nitration, and then the nitrate nitrogen enters the secondary A/O biochemical cavity 32 through the communicating pipe 33 to also perform the same nitration and denitrification reactions as those in the primary A/O biochemical cavity 31 so as to reduce the ammonia nitrogen in the effluent to reach the standard, then pumping the water into the flocculation tank 4 through a second water pump 34, adding a flocculating agent, stirring by a motor, improving, standing, improving the sedimentation effect, separating mud from water, clarifying the discharged water, opening an electromagnetic valve 45, discharging the water into a filter box 5, and filtering by activated carbon 51 to meet the discharge requirement; the settled sludge is discharged into the first-stage A/O biochemical cavity 31 and the second-stage A/O biochemical cavity 32 by opening the sludge discharge valve 48 and then driving the spiral conveying paddle 44 to rotate through the motor 41, so that the sludge concentration of the two-stage A/O biochemical cavity is improved.

Claims (7)

1. The utility model provides a waste water treatment device is used in N-methyl pyrrolidone production, includes header tank (1), its characterized in that: the surface of header tank (1) is provided with water inlet (13), the side-mounting of header tank (1) has first water pump (12), there is UASB reactor (2) first water pump (12) through water piping connection, UASB reactor (2) have biochemical case (3) through water piping connection, the side-mounting of biochemical case (3) has second water pump (34), there is flocculation jar (4) second water pump (34) through water piping connection, the surface mounting of flocculation jar (4) has drain pipe (46), the one end of drain pipe (46) is connected with rose box (5), the surface mounting of drain pipe (46) has solenoid valve (45).

2. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: a filter screen (11) is arranged on the inner side of the water collecting tank (1).

3. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: the upper end of the UASB reactor (2) is provided with a biogas collector (21).

4. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: a primary A/O biochemical cavity (31) and a secondary A/O biochemical cavity (32) are arranged on the inner side of the biochemical box (3), and a communicating pipe (33) is arranged between the primary A/O biochemical cavity (31) and the secondary A/O biochemical cavity (32).

5. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: the inner side surface of the flocculation tank (4) is provided with a motor (41), a rotating shaft of the motor (41) is fixedly connected with a driving rod (42), and the surface of the driving rod (42) is provided with a spiral conveying paddle (44) and a stirring blade (43).

6. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: the lower end of the flocculation tank (4) is provided with a shunt pipe (47), the sludge outlet of the shunt pipe (47) is connected with the biochemical box (3), and the surface of the shunt pipe (47) is provided with a sludge discharge valve (48).

7. The apparatus for treating wastewater from N-methylpyrrolidone production according to claim 1, wherein: the inside of rose box (5) is provided with active carbon (51), the surface of rose box (5) is provided with drain valve (52).

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