CN201148389Y - Urea industrial production wastewater treatment plant - Google Patents

Abstract

The utility model relates to a wastewater treatment device that is used in the industrial production of urea, and belongs to the wastewater treatment equipment. In the device, a grille groove (2) is connected with a production wastewater intake pipe (1) and a regulating tank (4); a lift pump (10) is connected with the regulating tank and a SBR reactor (12) through a water intake and drain pipe (11); the SBR reactor is connected with a monitoring tank (35) through a drain pipe (18), and connected with a sludge concentrating tank (22) through a dredge pipe (21); the monitoring tank (35) is provided with a standard water drain pipe (34), and connected with the regulating tank (4) through a monitoring pump (36) and a non-standard water backflow pipe (37); the sludge concentrating tank (22) is connected with a sludge reactor (26) through a sludge pumping pipe and a dredge pipe; the sludge reactor (26) is connected with a sludge drying device (28) through the dredge pipe (27) of the reactor; the sludge drying device is connected with the regulating tank (4) through a filtrate backflow pipe (32); and a coagulant aid adding box (31) is connected with the dredge pipe (25) of the sludge pump through a coagulant aid measuring pump (30) and an adding pipe (29). The wastewater treatment device can treat the wastewater of the low-concentration organics and the high-concentration urea to be standard for emission, and is suitable for treating the wastewater in the industrial production of urea.

Description

Urea industrial production wastewater treatment plant

Technical field:

The utility model relates to waste water treatment equipment, in particular to a waste water treatment device for urea industrial production.

Background technique:

The existing popular treatment technology is to set up split-type equipment to treat urea wastewater, and its main process is the A ² /0 method. The disadvantages of this process are:

1) The process is complex and there are many control points;

2) Not resistant to low concentration of organic matter and high concentration of NH ₃ -N in urea industrial production wastewater;

3) It occupies a large area and requires a high one-time investment.

Invention content:

The purpose of the utility model is to provide a urea industrial production wastewater treatment device, which can achieve the purpose of treating low-concentration organic matter and high-concentration urea wastewater to meet the standard discharge.

The composition of the utility model: consists of a mechanical grid, a regulating tank, a carbon source tank, a lift pump, an SBR reactor, a sludge concentration tank, a sludge lift pump, a sludge reactor, sludge drying equipment, and coagulant aid dosing Tank, monitoring pool, monitoring pump, accident pool, accident pump, various online monitoring instruments and submersible mixer, the production wastewater inlet pipe 1 is connected to the grid tank 2, and the mechanical grid 3 is installed in the grid tank 2, the grid The tank 2 communicates with the regulating tank 4, and the lifting pump 10 is connected to the top of the regulating tank 4 and the SBR reactor 12 through the lifting pump inlet and outlet pipes 11. The water purification equipment SBR reactor 12 is installed on the foundation 49, and the lower part of the SBR reactor 12 Equipped with an air distribution device 16, connected to the high-pressure fan 14 through the air supply pipe 15, the SBR reactor 12 is equipped with a decanter 13, and enters the monitoring tank 35 through the drain pipe 18, and the sludge discharge system 17 in the SBR reactor 12 passes through The manual control valve 19 and the electric control valve 20 are connected to the sludge thickening tank 22 through the sludge discharge pipe 21; the carbon source tank 7 is equipped with a siphon metering device 6, and the siphon metering device 6 is connected through the carbon source dosing pipe 5 Inside the grid slot 2;

The accident wastewater inlet pipe 39 is connected to the grid tank 40, the grid tank 40 is equipped with a mechanical grid 41, the grid tank 40 is connected to the accident pool 42, and the emergency pump 43 is connected to the accident pool 42 and adjusted through the accident pump inlet and outlet pipe 44. The pool 4 is connected; the monitoring pool 35 is equipped with a standard water discharge pipe 34, and the monitoring pump 36 is connected to the monitoring pool 35, the regulating pool 4 and the transcending pipe 46 through the unqualified water return pipe 37, and the exceeding pipe 46 is connected to the accident pool 42;

The sludge concentration tank 22 is equipped with a sludge discharge pipe 21 and a supernatant liquid return pipe 33, the supernatant liquid return pipe 33 is connected with the filtrate return pipe 32, and the sludge lifting pump 24 is connected to the sludge concentration tank through the sludge pump suction pipe 23 22 is connected to the sludge reactor 26 through the sludge pump outlet pipe 25, the sludge reactor 26 is connected to the sludge drying equipment 28 through the reactor sludge outlet pipe 27, and the sludge drying equipment 28 is connected to the filtrate return pipe 32 is connected with the adjustment tank 4, the coagulant aid dosing box 31 is equipped with a coagulant aid metering pump 30, and the coagulant aid metering pump 30 is connected with the sludge pumping mud pipe 25 through the coagulant aid dosing pipe 29.

A submersible mixer 47 is installed in the adjustment pool 4 , the SBR reactor 12 , the monitoring pool 35 and the emergency pool 42 .

An on-line monitoring instrument 48 is installed in the regulating pool 4, an online monitoring instrument 38 for NH ₃ -N and COD is installed in the monitoring pool 35, and online monitoring instruments for DO, ORP, and MLSS are also installed in the SBR reactor 12.

On the inlet and outlet pipes 11 of the lift pump, there are flanged outlet electric control valves 9, manual control valves 8 and overrun valves 45. The overrun pipes 46 are connected with the overrun valves 45 and connected to the emergency pool 42.

Compared with the prior art, the utility model treats industrial production wastewater such as synthetic ammonia, urea, ammonium nitrate, and ammonium bicarbonate to meet the standard discharge level, especially a water purification device with the SBR reactor as the core, which can remove low-concentration organic matter And high-concentration urea wastewater treatment meets the discharge standards, and realizes small footprint, low investment, quick results, stable effluent quality, convenient management and automatic operation.

Description of drawings:

Accompanying drawing is the structural representation of the utility model.

In the figure 1. Production wastewater inlet pipe, 2. Grille tank, 3. Mechanical grille, 4. Adjusting tank, 5. Carbon source dosing pipe, 6. Siphon metering device, 7. Carbon source tank, 8. Manual Control valve, 9. Water outlet electric control valve, 10. Lift pump, 11. Lift pump inlet and outlet pipes, 12. SBR reactor, 13. Decanter, 14. High pressure fan, 15. Air supply pipe, 16. Cloth Wind device, 17. Sludge discharge system, 18. Drainage pipe, 19. Manual valve, 20. Electric control valve, 21. Sludge discharge pipe, 22. Sludge concentration tank, 23. Sludge pump suction pipe, 24. Sludge lifting pump, 25. Sludge pump outlet pipe, 26. Sludge reactor, 27. Reactor sludge outlet pipe, 28. Sludge drying equipment, 29. Coagulant dosing pipe, 30. Coagulation aid Agent metering pump, 31. Coagulant dosing box, 32. Filtrate return pipe, 33. Supernatant liquid return pipe, 34. Standard water discharge pipe, 35. Monitoring pool, 36. Monitoring pump, 37. Unqualified water return Pipe, 38. NH ₃ -N and COD online monitor, 39. Accident wastewater inlet pipe, 40. Grille tank, 41. Mechanical grille, 42. Accident pool, 43. Accident pump, 44. Accident pump inlet and outlet Water pipe, 45. Overrun valve, 46. Override tube, 47. Submersible mixer, 48. Online monitoring instrument, 49. Foundation.

Detailed ways:

As shown in the figure, 1. Water inlet and regulating tank: the production waste water inlet pipe 1 is connected to the grid tank 2 and enters it. The mechanical grid 3 is installed in the grid tank 2, and the grid tank 2 is connected to the regulating tank 4 and Connected, submersible mixer 47, lift pump inlet and outlet pipes 11, filtrate return pipe 32, unqualified water return pipe 37 and online monitoring instrument 48 are installed in the adjustment pool 4. 2. Lifting system: lift pump 10 is equipped with lift pump inlet, The outlet pipe 11 is connected to the SBR reactor 12; the inlet and outlet pipes 11 of the lift pump are also equipped with an outlet electric control valve 9, an override valve 45 and a manual control valve 8 connected by flanges; the override pipe 46 is connected with the override valve 45, And access in the accident pool 42. 3. Water purification equipment: 1) The water purification equipment SBR reactor 12 is a steel structure or reinforced concrete structure, and is installed on the foundation 49 . 2) Water inlet system: the top of the SBR reactor 12 is equipped with a water inlet pipe 11. 3) Air supply system; the lower part of the SBR reactor 12 is equipped with an air distribution device 16, which is connected to the air supply pipe 15, and the air supply pipe 15 is connected to the high-pressure fan 14 connected. 4) Drainage system; the SBR reactor 12 is equipped with a decanter 13 outside the outlet, connected to the drain pipe 18, and the drain pipe 18 is connected to the monitoring tank 35. The formation of the decanter can be set according to the self-control level. 5) Stirring device; SBR reactor 12 is equipped with a submersible mixer 47. 6) Sludge discharge system: SBR reactor 12 is equipped with a sludge discharge system 17 outside the connector, which is connected with the manual control valve 19 and the electric control valve 20 with flanges Connected, the electric control valve 20 is connected with the sludge discharge pipe 21, and the sludge discharge pipe 21 is connected to the sludge thickening tank 22. 7) On-line monitoring instruments: DO, ORP, MLSS and other on-line monitoring instruments are also installed in the SBR reactor 12, which can be set according to the level of self-control.

4. Nutrient source supplementation: the carbon source tank 7 is equipped with a siphon metering device 6, and a metering pump can also be used; the siphon metering device 6 is connected with the carbon source feeding pipe 5, and the carbon source feeding pipe 5 is connected to the grid groove 2 Inside.

5. Accident system: the accident waste water inlet pipe 39 is connected to the grid tank 40 and enters the tank; the grid tank 40 is equipped with a mechanical grid 41; the grid tank 40 is connected to the accident pool 42 and communicated; the accident pool 42 is equipped with A submersible mixer 47 and an accident pump inlet and outlet pipe 44 are arranged; the accident pump 43 is connected with the accident pump inlet and outlet pipe 44;

6. Monitoring system: submersible mixer 47, NH ₃ -N and COD on-line monitor 38 are installed in the monitoring pool 35, the standard water discharge pipe 34 is connected from the monitoring pool 35, and the unqualified water return pipe 37 and the monitoring tank 35 are installed in the monitoring pool 35. The pump 36 is connected to each other, and the unqualified water return pipe 37 is connected to the regulating tank 4 and connected to the transcending pipe 46 .

7. Sludge treatment system: the sludge concentration tank 22 is equipped with a sludge discharge pipe 21 and a supernatant liquid return pipe 33, the supernatant liquid return pipe 33 is connected with the filtrate return pipe 32, and the sludge concentration tank 22 is also equipped with a sludge The sludge pump suction pipe 23, the sludge pump suction pipe 23 is connected with the suction port of the sludge lift pump 24, and the outlet of the sludge lift pump 24 is equipped with a sludge pump outlet pipe 25 and connected to the sludge reactor 26, the sludge The bottom of the sludge reactor 26 is connected to the reactor mud outlet pipe 27, and the reactor mud outlet pipe 27 is connected to the sludge drying equipment 28. The form of the sludge drying equipment can be selected according to the needs, and it is connected to Out of the filtrate return pipe 32, and connected to the regulating tank 4; the coagulant aid dosing box 31 is equipped with a coagulant aid metering pump 30, and the coagulant aid metering pump 30 outlet is equipped with a coagulant aid dosing pipe 29, and the coagulant aid Dosing pipe 29 is connected with sludge pumping mud pipe 25 .

working principle:

The urea industrial production wastewater enters the grid tank 2 from the water inlet pipe 1, flows through the mechanical grid 3, intercepts large suspended solids, and avoids blocking subsequent equipment, and the water passing through the grid flows into the regulating tank 4 to adjust the water volume and homogenize the water quality to ensure the load of subsequent equipment Evenly, the lift pump 10 operates according to the requirements of the SBR water intake cycle, and sends the regulating pool water into the SBR reactor 12. The SBR reactor completes a treatment cycle in sequence through the processes of water intake, aeration, sedimentation, decanting, and idleness, and is reacted by the SBR. The treated water discharged from the decanter in the device 12 enters the monitoring tank 35, and the on-line monitor 38 such as COD is equipped in the monitoring tank. Under the monitoring, the qualified water is discharged, and the entire water treatment process is completed.

Supplementation and stirring of nutrient sources; since the biochemical treatment process requires C/N ≥ 3 to have better biochemical conditions, and the ratio of C and N in the synthetic ammonia production wastewater often fails to meet the requirements, it is necessary to add biochemicals to the adjustment tank in due course Strong carbon source, the carbon source is added into the regulating pool 4 by the carbon source tank 7 through the siphon metering device 6 . In the adjustment tank 4, a submersible mixer 47 is provided to stir in time, and ensure that the sludge does not sink to the bottom and has a considerable biochemical pre-reaction effect.

Air supply system: When the SBR reactor 12 needs air supply, the air source is sent from the high-pressure fan 14 to the air distribution device 16 in the SBR reactor 12 for aeration.

Water outlet system: When the SBR reactor 12 reaches the drainage process, the decanter 13 performs decanting, and the supernatant is sent to the monitoring tank 35, and is discharged from the standard water discharge pipe 34 when it is qualified by the online monitor 38.

Sludge discharge: When the SBR reactor 12 needs to discharge sludge, open the electronic control valve 20, and the sludge in the SBR reactor 12 is collected by the sludge discharge system 17 and discharged into the sludge thickening tank 22 for concentration.

Accident protection system; accident wastewater generally has the following three categories: 1) early rainwater, fire accident water and equipment accident or maintenance wastewater, these wastewater components are complex and high in concentration, and flow into the grid groove 40 by the accident wastewater inlet pipe 39, and pass through the mechanical grid. The grid 41 blocks the bulk suspended matter and then flows into the accident pool 42, and then the emergency pump 43 is sent into the regulating pool 4 to participate in processing according to the acceptable shooting stars of the water purification equipment. In order to homogenize the water quality and prevent sedimentation, the emergency pool 42 is equipped with a submersible mixer 47. 2) Wastewater with disproportionate urea: when the NH ₃ -N and COD in the adjustment pool are not in biochemical ratio, use the lift pump 10 to lift, pass the overrun valve 45 and overrun The pipe 46 is sent to the accident pool 42. 3) Unqualified water of the SBR reactor: when there is unqualified water in the monitoring pool 35, the monitoring pump 36 is used to send it back to the regulating pool 4 or the accident pool 42 to participate in reprocessing.

Sludge treatment system: After the sludge is concentrated in the sludge thickening tank 22, the supernatant flows back to the regulating tank 4, and the sludge is lifted by the sludge lifting pump 24, and then sent into the pressure sludge reactor 26 and coagulated Coagulant dosing box 31 and coagulant aid metering pump 30 send the coagulant to react, and the reaction sludge is pressed into the sludge drying equipment 28, and the dried mud is transported out, and the effluent is sent back to the regulating tank 4.

Automatic control: SBR reactor automatic control: SBR reactor is an intermittent biochemical treatment process. Its reaction can be divided into five stages: water intake, aeration, sedimentation, decanting and idleness. Its operation mainly depends on various instruments Monitoring is done with PLC automatic control.

Water intake stage; when the SBR reactor 12 passes the idle stage and enters the next processing cycle, the lift pump 10 is instructed to feed water into the SBR reactor 12 according to the water intake duration, and the pump is automatically stopped when the time is up.

Aeration stage: After water intake, command the variable frequency high-pressure fan 14 to supply air according to the aeration duration, and stop at the time, and the air supply volume will be controlled according to the DO online monitor to test the dissolved oxygen in the water, guide the fan frequency conversion, adjust the air supply volume, and ORP online The monitor judges the redox capacity of the aerobic stage, that is, the processing capacity of the SBR, and adjusts the aeration cycle accordingly.

Precipitation stage: No equipment is turned on at this stage, and it is carried out according to the duration of precipitation.

Drainage stage: after the sedimentation is over, instruct the decanter 13 to decant water according to the duration of drainage. The decanter can use the products commonly used at present, but it must be able to automatically adjust the drainage flow and the duration of drainage.

Idle stage: according to the idle period, the submersible mixer 47 installed in the SBR reactor 12 is automatically turned on to perform anoxic and anaerobic reactions. After the idle stage is completely completed, the equipment enters the next round of processing cycle.

Sludge discharge: The SBR reactor 12 is equipped with an MLSS online monitor to monitor the sludge concentration in the reactor. When the MLSS>8000mg/L, the command automatically opens the sludge discharge valve 20 to discharge the sludge. The amount of mud discharge shall be monitored and determined according to the specified MLSS indicators.

Self-control of the monitoring pool: the effluent of the SBR reactor 12 is discharged into the monitoring pool 35. When the NH ₃ -N and COD online monitors in the pool monitor that the water in the pool is unqualified, the monitoring pump 36 is instructed to automatically start, and the unqualified water is returned to the regulating pool 4 or accident The pool 42 participates in reprocessing until the incoming water in the monitoring pump 36 is qualified.

Water quality control in the regulating pool: the regulating pool 4 is equipped with online monitoring instruments 48 such as PH, COD, NH ₃ -N and liquid level sensors to monitor the water quality in the pool. When the monitoring index of the pool water does not meet the SBR12 treatment index, the command is closed The water pump discharges the electric control valve 9, opens the lift pump 10 and the overrun valve 45, and sends the water into the accident pool 42 to be treated.

Other systems: Other systems such as carbon source dosing, mechanical grille, submersible mixer, emergency pump, disinfection and sludge treatment systems can adopt general self-control procedures.

Claims (4)

1. urea industry production wastewater treatment device, by mechanical grille, equalizing tank, the carbon source jar, lift pump, the sbr reactor device, sludge thickener, the mud lift pump, sewage sludge reactor, sludge drying equipment, the coagulant aids dispensing kit, the monitoring pond, the monitoring pump, accident pool, the accident pump, various on-line monitoring instrument and diving mixer are formed, it is characterized in that: factory effluent water inlet pipe (1) links to each other with frame trough (2), mechanical grille (3) is housed in frame trough (2), frame trough (2) is communicated with equalizing tank (4), lift pump (10) advances by lift pump, rising pipe (11) links to each other with sbr reactor device (12) top with equalizing tank (4) respectively, water purifying plant sbr reactor device (12) is installed on the basis (49), air-distributing device (16) is equipped with in sbr reactor device (12) bottom, link to each other with high pressure positive blower (14) by air feed pipe (15), be equipped with in the sbr reactor device (12) and strain hydrophone (13), insert in the monitoring pond (35) by water shoot (18), sludge drainage system (17) in the sbr reactor device (12) is by manual valve (19), electric control valve (20) is inserted in the sludge thickener (22) by shore pipe (21); Hydrocone type measuring apparatus (6) is housed on the carbon source jar (7), and hydrocone type measuring apparatus (6) adds pipe (5) by carbon source and inserts in the frame trough (2);

Accident wastewater inlet pipe (39) links to each other with frame trough (40), mechanical grille (41) is housed in the frame trough (40), frame trough (40) links to each other with accident pool (42), and accident pump (43) links to each other with equalizing tank (4) with accident pool (42) by accident pump inlet tube and outlet tube (44); In monitoring pond (35) water discharge spout up to standard (34) is housed, monitoring pump (36) respectively with monitoring pond (35), equalizing tank (4) with surmount pipe (46) and link to each other, surmounts pipe (46) connection accident pool (42) by defective water return line (37);

Shore pipe (21) and supernatant liquor return line (33) are housed on the sludge thickener (22), supernatant liquor return line (33) links to each other with filtrate return line (32), mud lift pump (24) is connected with sludge thickener (22) by sludge pump suction pipe (23), be connected with sewage sludge reactor (26) by sludge pump sludge out pipe (25), sewage sludge reactor (26) is connected with sludge drying equipment (28) by reactor sludge out pipe (27), sludge drying equipment (28) is connected with equalizing tank (4) by filtrate return line (32), coagulant aids adds coagulant aids volume pump (30) is housed on the case (31), and coagulant aids volume pump (30) adds pipe (29) by coagulant aids and is connected with sludge pump sludge out pipe (25).

2. urea industry production wastewater treatment device according to claim 1 is characterized in that: in equalizing tank (4), sbr reactor device (12), monitoring pond (35) and accident pool (42) diving mixer (47) is installed.

3. urea industry production wastewater treatment device according to claim 1 is characterized in that: on-line monitoring instrument (48) is housed in equalizing tank (4), NH is installed in monitoring pond (35) ₃-N and COD on-line monitoring instrument (38) also are equipped with DO, ORP, MLSS on-line monitoring instrument in sbr reactor device (12).

4. urea industry production wastewater treatment device according to claim 1, it is characterized in that: water outlet electrically-controlled valve (9), the manually operated control valve (8) that connects with flange is housed on lift pump inlet tube and outlet tube (11) and surmounts valve (45), surmount pipe (46) and surmount valve (45) and link to each other, and insert accident pool (42).

Images