Carbon washing wastewater treatment system

Abstract

The invention discloses a carbon washing wastewater treatment system which comprises a raw water inlet system, a chemical adding system, a conditioning system, a buffer system, a clear water discharging system and a sewage discharging system, the raw water inlet system comprises a water inlet pump and a static mixer which are sequentially connected; the static mixer is connected with the conditioning system; the dosing system comprises a ferric salt tank, a PAM tank and a PAC tank, the PAC tank is connected with the static mixer, and the ferric salt tank and the PAM tank are connected with the buffer system; the conditioning system and the buffer system are connected with the clean water drainage pipe, and upper-layer clean water in the conditioning system and the buffer system is output to the clean water drainage pipe; the conditioning system is connected with the buffer system, and lower-layer sewage in the conditioning system is fed into the buffer system; lower-layer sludge in the buffer system is fed into the blowdown system; and the sewage discharge system comprises a sludge feeding screw pump, a presser and a belt conveyor which are connected in sequence. According to the invention, carbon washing wastewater can be subjected to comprehensive treatment, separation and filtration, clear water and sludge can be separated, resource recycling is realized, and waste is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a carbon washing wastewater treatment system. Background Art

[0002] In the process of flushing the carbon filter tank, it is generally necessary to flush it four times, which will then produce a large amount of carbon washing wastewater. The overall water content of the carbon washing wastewater is usually as high as 99.97%. If it is directly discharged without treatment, it will not only pollute the environment, but also cause a lot of waste of resources. Summary of the invention

[0003] The object of the present invention is to provide a carbon washing wastewater treatment system, which can comprehensively treat and separate the carbon washing wastewater, separate clean water and sludge, realize resource recycling and avoid waste.

[0004] To achieve the above-mentioned purpose, the present invention provides a carbon washing wastewater treatment system, comprising a raw water inlet system, a dosing system, a conditioning system, a buffer system, a clear water discharge system and a sewage discharge system;

[0005] The raw water inlet system comprises an inlet pump and a static mixer connected in sequence;

[0006] The static mixer is connected to a conditioning system;

[0007] The dosing system includes an iron salt tank, a PAM tank and a PAC tank, the PAC tank is connected to a static mixer, and the iron salt tank and the PAM tank are connected to a buffer system;

[0008] The clean water drainage system comprises a clean water drainage pipe, the conditioning system and the buffer system are connected to the clean water drainage pipe, and the upper clean water in the conditioning system and the buffer system is output to the clean water drainage pipe;

[0009] The conditioning system is connected to the buffer system, and the lower sewage in the conditioning system is sent to the buffer system;

[0010] The lower layer of sludge in the buffer system is sent to the sewage system;

[0011] The sewage discharge system comprises a mud inlet screw pump, a press and a belt conveyor which are connected in sequence.

[0012] As a further solution of the present invention: the water inlet end of the water inlet pump is connected to a plurality of submersible pumps connected in parallel.

[0013] As a further solution of the present invention: a PAC dosing pump is connected between the PAC tank and the static mixer; an iron salt dosing pump and an iron salt dosing valve are sequentially connected between the iron salt tank and the buffer system; a PAM dosing pump and a PAM dosing valve are sequentially connected between the PAM tank and the buffer system.

[0014] As a further solution of the present invention: the conditioning system includes a plurality of conditioning tanks connected in parallel, the buffer system includes a plurality of buffer tanks connected in parallel, and the conditioning tanks and the buffer tanks are both connected to the clean water drainage pipe via a clean water valve.

[0015] As a further solution of the present invention: the conditioning tank and the buffer tank are both provided with a liquid level meter and an aeration valve.

[0016] As a further solution of the present invention: a water inlet valve is connected between the static mixer and the conditioning system, and a sludge valve, a centrifugal feed pump and a water inlet valve are sequentially connected between the conditioning system and the buffer system.

[0017] As a further solution of the present invention: the buffer system is connected to the mud inlet screw pump through a mud valve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The carbon washing raw water and PCA reagent solution are mixed through a static mixer, and fully reacted through aeration in the conditioning tank to form floccules. After a certain period of flocculation and sedimentation, most of the carbon powder particle wastewater in the raw water is concentrated in the cone bottom of the conditioning tank; the bottom wastewater after sedimentation and concentration flows into the buffer tank for temporary storage under the pumping of a centrifugal feed pump; if the concentration effect of the wastewater temporarily stored in the buffer tank is not good, PAM reagents and iron salt reagents can be added for adjustment. If the concentration effect is good, it is sent to the press by a high-pressure pressing feed pump to form a block mud cake output, thereby realizing the cement separation and recovery of the carbon washing raw water; the overall efficiency of the system is high, and each stage can be carried out manually or automatically through setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a carbon washing wastewater treatment system of the present invention;

[0021] In the figure: 1. submersible pump, 2. water inlet pump, 3. PAC dosing pump, 4. iron salt tank, 5. PAM tank, 6. iron salt dosing pump, 7. PAM dosing pump, 8. PAC tank, 9. water inlet valve, 10. conditioning tank, 11. centrifugal feed pump, 12. PAM dosing valve, 13. buffer tank, 14. iron salt dosing valve, 15. aeration valve, 16. sludge valve, 17. sludge inlet screw pump, 18. press, 19. belt conveyor, 20. clean water valve, 21. clean water drain pipe, 22. static mixer. DETAILED DESCRIPTION

[0022] The present invention will be further described below by way of examples.

[0023] like Figure 1 As shown, a carbon washing wastewater treatment system includes a raw water inlet system, a dosing system, a conditioning system, a buffer system, a clean water discharge system and a sewage discharge system;

[0024] The raw water inlet system comprises an inlet pump 2 and a static mixer 22 connected in sequence;

[0025] The static mixer 22 is connected to the conditioning system;

[0026] The dosing system includes an iron salt tank 4, a PAM tank 5 and a PAC tank 8, the PAC tank 8 is connected to a static mixer 22, and the iron salt tank 4 and the PAM tank 5 are connected to a buffer system;

[0027] The clean water drainage system includes a clean water drainage pipe 21, and the conditioning system and the buffer system are connected to the clean water drainage pipe 21, and output the upper clean water in the conditioning system and the buffer system to the clean water drainage pipe 21;

[0028] The conditioning system is connected to the buffer system, and the lower sewage in the conditioning system is sent to the buffer system;

[0029] The lower layer of sludge in the buffer system is sent to the sewage system;

[0030] The sewage discharge system includes a mud inlet screw pump 17, a press 18, and a belt conveyor 19 which are connected in sequence.

[0031] Furthermore, the water inlet end of the water inlet pump 2 is connected to a plurality of submersible pumps 1 in parallel. As shown in the figure, three groups are arranged in parallel, and the carbon washing raw water is delivered to the water inlet pump 2 through the submersible pump 1 .

[0032] Furthermore, a PAC dosing pump 3 is connected between the PAC tank 8 and the static mixer 22; an iron salt dosing pump 6 and an iron salt dosing valve 14 are sequentially connected between the iron salt tank 4 and the buffer system; a PAM dosing pump 7 and a PAM dosing valve 12 are sequentially connected between the PAM tank 5 and the buffer system. According to the concentration of sewage in the buffer system, the addition of PAM agents and iron salt agents is adjusted.

[0033] Furthermore, the conditioning system includes several conditioning tanks 10 connected in parallel, and the buffer system includes several buffer tanks 13 connected in parallel. The conditioning tanks 10 and buffer tanks 13 are connected to the clean water drainage pipe 21 through the clean water valve 20. As shown in the figure, three groups of conditioning tanks 10 are arranged in parallel, and two groups of buffer tanks 13 are arranged in parallel. Each group of conditioning tanks 10 and buffer tanks 13 is connected to the clean water drainage pipe 21 through the clean water valve 20.

[0034] Furthermore, the conditioning tank 10 and the buffer tank 13 are both provided with a liquid level meter and an aeration valve 15. The liquid level meter can display the liquid level in the conditioning tank 10 and the buffer tank 13 in real time, and the aeration valve 15 can improve the mixing effect of the reagents and fully react to form floccules.

[0035] Furthermore, a water inlet valve 9 is connected between the static mixer 22 and the conditioning system, and a sludge valve 16, a centrifugal feed pump 11, and a water inlet valve 9 are sequentially connected between the conditioning system and the buffer system.

[0036] Furthermore, the buffer system is connected to the mud inlet screw pump 17 via a mud valve 16 .

[0037] When the present invention is used specifically, the main process flow is divided into water conditioning of carbon washing water, precipitation conditioning of buffer system, and squeezing of secondary precipitation wastewater, specifically:

[0038] 1. Carbon washing water conditioning:

[0039] 1.1) The conditioning system is divided into three conditioning tanks 10, each of which is provided with a water inlet valve 9 to feed carbon washing raw water;

[0040] 1.2) In the case of manual operation, when a single conditioning tank 10 is inlet and conditioned, it is necessary to first open the water inlet valve 9 connected to the conditioning tank 10 and simultaneously start the PAC dosing pump 3;

[0041] 1.3) After confirming that the water inlet valve 9 and the PAC dosing pump 3 are open, turn on two of the submersible pumps 1, and after 2-3 seconds, turn on the water inlet pump 2 to pump the raw water for carbon washing into the conditioning tank 10;

[0042] 1.4) At water inlet flow rate of 300m 3 / h water inlet pump 2 works, the water inlet time is about 4min, and the water inlet is stopped after the water level in the conditioning tank 10 reaches the set value; to stop the water inlet, first turn off the water inlet pump 2, then turn off the submersible pump 1 and the PAC dosing pump 3, and finally close the water inlet valve 9 on the conditioning tank 10;

[0043] 1.5) After the water inflow to the conditioning tank 10 is completed, the aeration valve 15 is opened, and after the stirring time is about 3 minutes, the aeration is stopped to perform flocculation and sedimentation;

[0044] 1.6) After the flocculation and sedimentation in the conditioning tank 10 for about 20 minutes, observe the sewage sedimentation and start preparing to discharge the sewage into the buffer tank 13;

[0045] 1.7) First, open the water inlet valve 9 on the buffer tank 13, then open the sludge valve 16 on the conditioning tank 10, and the sewage discharge time is about 2 minutes. At this time, close the sludge valve 16 and open the clean water valve 20. The clean water will be discharged to the clean water drain pipe 21 by gravity for about 4 minutes;

[0046] 1.8) After the sewage discharge from the conditioning tank 10 is completed, the clean water valve 20 can be opened to drain all the supernatant in the conditioning tank 10.

[0047] 2. Buffer system precipitation conditioning:

[0048] 2.1) The buffer system is divided into two buffer tanks 13, which are mainly used to receive concentrated sewage from the conditioning tank 10 and then enter the buffer tank 13 for secondary concentration;

[0049] 2.2) When the conditioning tank 10 starts to discharge sewage, first open the water inlet valve 9 of one of the two buffer tanks 13, then open the sludge valve 16 on the conditioning tank 10, and then open the centrifugal feed pump 11 after confirming that both valves are open;

[0050] 2.3) The sewage discharge time of the conditioning tank 10 is generally 3 minutes, which is actually determined according to the water flow rate of the centrifugal feed pump 11; the specific determination method is: the volume of sewage at the bottom of all conditioning tanks 10 / the water flow rate of the centrifugal feed pump 11 = the sewage discharge time of the conditioning tank 10;

[0051] 2.4) When the conditioning tank 10 finishes discharging sewage, the centrifugal feed pump 11 needs to be turned off first, and then the sludge valve 16 on the conditioning tank 10 can be closed, and finally the water inlet valve 9 on the buffer tank 13 can be closed; at this point, the conditioning tank 10 discharges sewage and the buffer tank 13 finishes inletting water;

[0052] 2.5) It should be noted that when the concentration of the raw water for washing carbon is high, after the sewage is discharged into the buffer tank 13, it is directly fed into the press 18 without conditioning or adding medicine; when the concentration of the raw water changes in the future, this process needs to be conditioned and dosing; ensure that the press 18 can normally intercept the carbon powder particles in the raw water for washing carbon;

[0053] 2.6) The following is the operation process of secondary conditioning and concentration in the buffer tank 13 when the concentration of the raw water changes and the slurry from the press 18 cannot intercept the carbon powder particles and cannot form a slurry cake:

[0054] 2.6.1) Similar to the process in the conditioning tank 10, the PAM agent or iron salt agent (FeCl3 agent) is added during the process of the sewage from the three groups of conditioning tanks 10 being pumped into the buffer tank 13 after sedimentation;

[0055] 2.6.2) The dosage ratio of PAM or FeCl3 is adjusted and determined according to the on-site conditions; the maximum concentration of PAM is about 0.3%, and the maximum concentration of FeCl3 is about 30%;

[0056] 2.6.3) After the buffer tank 13 is filled with water, the aeration valve 15 is opened for about 2 minutes. After the aeration is completed and the buffer tank 13 is allowed to settle for about 10 minutes, the sludge valve 16 is opened and the buffer tank 13 begins to drain.

[0057] 3. Secondary sedimentation wastewater squeezing:

[0058] The sewage after sedimentation from the buffer tank 13 is pumped into the press 18 through the mud screw pump 17 for squeezing and filtration. Specifically:

[0059] 3.1) After confirming that the liquid level of the two buffer tanks 13 is not lower than the low liquid level, the mud screw pump 17 is turned on, and at least one of the two buffer tanks 13 is in a high liquid level and water is stopped; at the same time, the work in the conditioning tank 10 must not be in a shutdown state;

[0060] 3.2) After confirming the liquid level of the buffer tank 13, prepare to start mud squeezing; start the squeezing function of the squeezing machine 18 and confirm that the squeezing machine 18 is in a pressure-maintaining state; after confirming the state of the squeezing machine 18, open the sludge valve 16 of the buffer tank 13, and then start the mud-inlet screw pump 17; pump the sewage after secondary sedimentation into the squeezing machine 18 for squeezing and separation;

[0061] 3.3) When the press 18 is feeding mud, attention should be paid to the frequency conversion frequency of the mud feeding screw pump 17, and the frequency conversion frequency should be kept at about 30-40; by observing the mud feeding pressure of the mud feeding flow meter connected to the mud feeding screw pump 17, the size of the manual ball valve of the mud feeding return pipe should be adjusted so that the mud feeding flow rate is kept at 14-20m when the frequency conversion frequency of the motor of the mud feeding screw pump 17 is about 30-40. 3 / h, the pressure is maintained between 0.3 and 0.6 MPa;

[0062] 3.4) After the press 18 finishes squeezing, start the bottom belt conveyor 19 and start to loosen the press 18 to start unloading the mud, and send the mud cake out through the belt conveyor 19.

Claims

1. A carbon washing wastewater treatment system, characterized in that: Including raw water inlet system, dosing system, conditioning system, buffer system, clean water drainage system and sewage drainage system; The raw water inlet system comprises an inlet pump (2) and a static mixer (22) which are connected in sequence; The static mixer (22) is connected to a conditioning system; The dosing system comprises an iron salt tank (4), a PAM tank (5) and a PAC tank (8), the PAC tank (8) is connected to a static mixer (22), and the iron salt tank (4) and the PAM tank (5) are connected to a buffer system; The clean water drainage system comprises a clean water drainage pipe (21), the conditioning system and the buffer system are connected to the clean water drainage pipe (21), and the upper clean water in the conditioning system and the buffer system is output to the clean water drainage pipe (21); The conditioning system is connected to the buffer system, and the lower sewage in the conditioning system is sent to the buffer system; The lower layer of sludge in the buffer system is sent to the sewage system; The sewage discharge system comprises a mud inlet screw pump (17), a press (18), and a belt conveyor (19) which are connected in sequence.

2. A carbon washing wastewater treatment system according to claim 1, characterized in that: The water inlet end of the water inlet pump (2) is connected to a plurality of submersible pumps (1) connected in parallel.

3. A carbon washing wastewater treatment system according to claim 1, characterized in that: A PAC dosing pump (3) is connected between the PAC tank (8) and the static mixer (22); an iron salt dosing pump (6) and an iron salt dosing valve (14) are sequentially connected between the iron salt tank (4) and the buffer system; and a PAM dosing pump (7) and a PAM dosing valve (12) are sequentially connected between the PAM tank (5) and the buffer system.

4. A carbon washing wastewater treatment system according to claim 1, characterized in that: The conditioning system comprises a plurality of conditioning tanks (10) connected in parallel, and the buffer system comprises a plurality of buffer tanks (13) connected in parallel. The conditioning tanks (10) and the buffer tanks (13) are both connected to a clean water drainage pipe (21) via a clean water valve (20).

5. A carbon washing wastewater treatment system according to claim 4, characterized in that: The conditioning tank (10) and the buffer tank (13) are both provided with a liquid level meter and an aeration valve (15).

6. A carbon washing wastewater treatment system according to claim 1, characterized in that: A water inlet valve (9) is connected between the static mixer (22) and the conditioning system, and a sludge valve (16), a centrifugal feed pump (11), and a water inlet valve (9) are sequentially connected between the conditioning system and the buffer system.

7. A carbon washing wastewater treatment system according to claim 1, characterized in that: The buffer system is connected to the mud inlet screw pump (17) via a mud valve (16).

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