Cold rolling PSA wastewater pre-precipitation system

Abstract

The utility model discloses a cold rolling PSA (Pressure Swing Adsorption) wastewater pre-precipitation system which comprises an ammonia water adding device, a pre-precipitation device and a clear liquid pool which are connected in sequence, the ammonia water adding device comprises an ammonia gas storage tank and an ammonia water tank communicated with the ammonia gas storage tank through a pipeline, and an outlet below the ammonia water tank is communicated with an inlet of the pre-precipitation device through a pipeline; the front sedimentation device comprises a mixing tank, a flocculation tank and a sedimentation tank which are sequentially communicated, a PSA wastewater discharge pipe is arranged above the mixing tank, a PAM discharge pipe is arranged above the flocculation tank, and a water outlet in the upper part of the sedimentation tank is communicated with an inlet of the clear liquid tank through a pipeline; a sulfuric acid feeding pipe is arranged above the clear liquid tank; and a clear liquid conveying pipe is mounted on an outlet of the clear liquid tank. The cold rolling PSA wastewater pre-precipitation system treats cold rolling PSA wastewater, realizes recovery of tin sludge, can reduce the amount of subsequent precipitates in an iron-carbon reactor, and reduces the pressure of subsequent water treatment.

Description

Technical Field

[0001] The utility model relates to the field of cold rolling wastewater treatment, in particular to a cold rolling PSA wastewater pre-precipitation system. Background Art

[0002] PSA is an important chemical raw material and a major component of the common electroplating solution for cold-rolled tin plating. Its production and application generate a large amount of PSA wastewater. The tin sludge in PSA wastewater has high economic value. Extracting as much of the tin sludge as possible from the wastewater can increase revenue while reducing the pressure on subsequent water treatment.

[0003] In existing technology, most tin sludge is recovered after being filtered out by the unit's tin sludge filter. However, a small amount is still discharged with wastewater to the wastewater treatment plant. The tin sludge generated during the water treatment process at the wastewater treatment plant often clogs equipment such as pumps, pipes, iron-carbon reactors, and inclined tube sedimentation tanks, causing significant trouble for water treatment and resulting in tin sludge waste. With increasing environmental emission requirements, the need to reduce PSA wastewater treatment costs and increase the amount of tin sludge recovered from wastewater, higher requirements are being placed on existing PSA wastewater treatment processes. Utility Model Content

[0004] The main purpose of the utility model is to provide a cold rolling PSA wastewater pre-precipitation system, aiming to facilitate the recovery of tin mud in PSA wastewater.

[0005] To achieve the above purpose, the utility model provides a cold rolling PSA wastewater pre-precipitation system, comprising an ammonia dosing device, a pre-precipitation device and a clear liquid tank connected in sequence, wherein:

[0006] The ammonia dosing device includes an ammonia storage tank and an ammonia water tank connected to the ammonia storage tank through a pipeline, and the outlet below the ammonia water tank is connected to the inlet of the pre-precipitation device through a pipeline;

[0007] The pre-precipitation device includes a mixing tank, a flocculation tank and a sedimentation tank which are connected in sequence. A PSA wastewater discharge pipe is provided above the mixing tank, a PAM discharge pipe is provided above the flocculation tank, and the upper water outlet of the sedimentation tank is connected to the inlet of the clear liquid tank through a pipeline.

[0008] A sulfuric acid discharge pipe is provided above the clear liquid pool, and a clear liquid delivery pipe is installed on the outlet of the clear liquid pool.

[0009] Preferably, a pH meter and a liquid level sensor are installed in the ammonia water tank, and a control valve is installed on the pipeline connecting the ammonia storage tank and the ammonia storage tank.

[0010] Preferably, an ammonia water dosing pump and a control valve are installed on the pipeline connecting the ammonia water tank and the pre-precipitation device.

[0011] Preferably, a stirring mechanism is provided inside the mixing tank and the flocculation tank.

[0012] Preferably, a pH meter is installed in the mixing tank.

[0013] Preferably, a sedimentation outlet is provided below the mixing tank and the flocculation tank, a sludge conveying pipe is installed on the sedimentation outlet, and a sludge conveying pump and a control valve are installed on the sludge conveying pipe.

[0014] Preferably, the upper water outlet of the sedimentation tank is located above the sedimentation discharge port, and the upper water outlet of the sedimentation tank is located above the inlet of the clear liquid tank.

[0015] Preferably, a control valve is installed on the sulfuric acid discharge pipe.

[0016] Preferably, a pH meter and a liquid level sensor are installed in the clear liquid tank.

[0017] Preferably, a clear liquid delivery pump and a control valve are installed on the clear liquid delivery pipe.

[0018] The cold rolling PSA wastewater pre-precipitation system proposed in this utility model has the following beneficial effects:

[0019] 1. It can achieve increased profitability. The treated effluent of this system can reduce and recover about 60-70% of the tin sludge in PSA wastewater before entering the iron-carbon reactor.

[0020] 2. It can reduce environmental risks. Because the tin sludge in PSA wastewater is in a stable valence state, it cannot be converted by water treatment and can only precipitate and eventually enter the neutral sludge landfill. However, when it cannot be completely precipitated, it will appear purple due to the attachment of PAC, causing the discharge outlet to change color and a sharp increase in COD. After recovering the tin sludge from PSA wastewater, the tin sludge in the wastewater can be greatly reduced, the risk of tin sludge mixing into the wastewater outlet can be reduced, and the pressure of subsequent water treatment can be reduced;

[0021] 3. This cold-rolled PSA wastewater pre-sedimentation system has the advantages of simple structure, stable and reliable operation and easy implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a preferred embodiment of the cold-rolled PSA wastewater pre-sedimentation system of the present utility model.

[0023] In the figure, 1-ammonia dosing device, 1.1-industrial water inlet pipe, 1.2-ammonia storage tank, 1.3-ammonia tank, 1.4-ammonia dosing pump, 1.5-ammonia delivery pipe, 1.6-first ammonia inlet pipe, 1.7-second ammonia inlet pipe, 2-pre-precipitation device, 2.1-PSA wastewater discharge pipe, 2.2-PAM discharge pipe, 2.3-mixing tank, 2.4-flocculation tank, 2.5-sedimentation tank, 3-clear liquid tank, 3.1-sulfuric acid discharge pipe, 4-clear liquid delivery pump, 4.1-clear liquid delivery pipe, 5-sludge delivery pump, 5.1-sludge delivery pipe, 6-stirring mechanism, 7-pH meter, 8-control valve, 9-liquid level sensor.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be noted that in the description of the present invention, the terms "transverse," "longitudinal," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Reference Figure 1 In this preferred embodiment, a cold rolling PSA wastewater pre-precipitation system comprises an ammonia dosing device 1, a pre-precipitation device 2 and a clear liquid tank 3 connected in sequence, wherein,

[0028] The ammonia dosing device 1 includes an ammonia gas storage tank 1.2 and an ammonia water tank 1.3 connected to the ammonia gas storage tank 1.2 via a pipeline. The outlet below the ammonia water tank 1.3 is connected to the inlet of the pre-precipitation device 2 via a pipeline.

[0029] Pre-sedimentation device 2 includes a mixing tank 2.3, a flocculation tank 2.4, and a sedimentation tank 2.5, which are connected in sequence. A PSA wastewater discharge pipe 2.1 is provided above mixing tank 2.3, a PAM (water purification flocculant) discharge pipe 2.2 is provided above flocculation tank 2.4, and the upper outlet of sedimentation tank 2.5 is connected to the inlet of clear liquid tank 3 through a pipe.

[0030] A sulfuric acid discharge pipe 3.1 is provided above the clear liquid tank 3, and a clear liquid delivery pipe 4.1 is installed at the outlet of the clear liquid tank 3.

[0031] An industrial water inlet pipe 1.1 is provided above the ammonia water tank 1.3. In this embodiment, two ammonia water tanks 1.3 are provided as an example for specific description. Both ammonia water tanks 1.3 are connected to the ammonia storage tank 1.2 through corresponding ammonia inlet pipes.

[0032] Furthermore, a pH meter 7 and a liquid level sensor 9 are installed in ammonia water tank 1.3, and a control valve 8 is installed on the pipeline connecting ammonia gas storage tank 1.2. The pH meter 7, liquid level sensor 9, and control valve 8 are all electrically connected to a controller to automatically control the addition of ammonia gas and thus adjust the pH value of the ammonia water.

[0033] Furthermore, an ammonia dosing pump 1.4 and a control valve 8 are installed on the pipeline connecting ammonia tank 1.3 and pre-precipitation device 2. Ammonia dosing pump 1.4 increases the power of ammonia tank 1.3 to add water to mixing tank 2.3. The pipeline connecting ammonia tank 1.3 and pre-precipitation device 2 is an ammonia delivery pipe 1.5.

[0034] Furthermore, both the mixing tank 2.3 and the flocculation tank 2.4 are provided with a stirring mechanism 6, thereby increasing the reaction rate of the PSA wastewater and the ammonia water and increasing the overall sedimentation rate. The sedimentation tank 2.5 can be an inclined tube sedimentation tank 2.5.

[0035] In this embodiment, a pH meter 7 is installed in the mixing tank 2.3. Sedimentation outlets are provided below both the mixing tank 2.3 and the flocculation tank 2.4. Sludge delivery pipes 5.1 are installed in these outlets. Sludge delivery pipes 5 and control valves 8 are installed in these pipes. Sludge is delivered via the sludge delivery pipes 5 to subsequent sludge treatment equipment.

[0036] Specifically, in this embodiment, the upper water outlet of the sedimentation tank 2.5 is located above the sedimentation discharge port, and the upper water outlet of the sedimentation tank 2.5 is located above the inlet of the clear liquid tank 3.

[0037] Furthermore, a control valve 8 is installed on the sulfuric acid discharge pipe 3.1, and the opening of the control valve 8 is controlled to control when sulfuric acid is added.

[0038] In this embodiment, a pH meter 7 and a liquid level sensor 9 are installed in the clear liquid tank 3, so as to detect the pH and liquid level of the clear liquid tank 3 in real time. In addition, a clear liquid delivery pump 4 and a control valve 8 are installed on the clear liquid delivery pipe 4.1.

[0039] It should be noted that, in this embodiment, each of the pH meter 7 , the liquid level sensor 9 and the control valve 8 is electrically connected to the controller to achieve automatic control.

[0040] The operating process of this cold-rolling PSA wastewater pre-precipitation system is as follows: First, ammonia is prepared and added via ammonia dosing device 1 for subsequent precipitation. Subsequently, the ammonia enters pre-precipitation device 2. Because the pH of the PSA wastewater entering pre-precipitation device 2 is between 1 and 2, it requires pH adjustment to remove metals such as tin sludge. After solid-liquid separation, the clear liquid enters clear liquid tank 3. In mixing tank 2.3, ammonia is added to raise the pH of the PSA wastewater to approximately 5. PAM is added to flocculation tank 2.4 to aggregate the resulting flocs into large alum flocs, improving precipitation performance. Sedimentation tank 2.5 separates the precipitate from the wastewater. After the effluent from sedimentation tank 2.5 enters clear liquid tank 3, the pH needs to be adjusted because the wastewater will be transported to the iron-carbon reactor. Sulfuric acid is added to adjust the pH of clear liquid tank 3 to between 2 and 3.

[0041] The cold rolling PSA wastewater pre-precipitation system proposed in this embodiment has the following beneficial effects:

[0042] 1. It can achieve increased profitability. The treated effluent of this system can reduce and recover about 60-70% of the tin sludge in PSA wastewater before entering the iron-carbon reactor.

[0043] 2. It can reduce environmental risks. Because the tin sludge in PSA wastewater is in a stable valence state, it cannot be converted by water treatment and can only precipitate and eventually enter the neutral sludge landfill. However, when it cannot be completely precipitated, it will appear purple due to the attachment of PAC, causing the discharge outlet to change color and a sharp increase in COD. After recovering the tin sludge from PSA wastewater, the tin sludge in the wastewater can be greatly reduced, the risk of tin sludge mixing into the wastewater outlet can be reduced, and the pressure of subsequent water treatment can be reduced;

[0044] 3. This cold-rolled PSA wastewater pre-sedimentation system has the advantages of simple structure, stable and reliable operation and easy implementation.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cold rolling PSA wastewater pre-precipitation system, characterized in that: It includes an ammonia dosing device, a pre-precipitation device and a clear liquid tank connected in sequence, wherein: The ammonia dosing device includes an ammonia storage tank and an ammonia water tank connected to the ammonia storage tank through a pipeline, and the outlet below the ammonia water tank is connected to the inlet of the pre-precipitation device through a pipeline; The pre-precipitation device includes a mixing tank, a flocculation tank and a sedimentation tank which are connected in sequence. A PSA wastewater discharge pipe is provided above the mixing tank, a PAM discharge pipe is provided above the flocculation tank, and the upper water outlet of the sedimentation tank is connected to the inlet of the clear liquid tank through a pipeline. A sulfuric acid discharge pipe is provided above the clear liquid pool, and a clear liquid delivery pipe is installed on the outlet of the clear liquid pool.

2. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A pH meter and a liquid level sensor are installed in the ammonia water tank, and a control valve is installed on the pipeline connecting the ammonia storage tank and the ammonia storage tank.

3. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: An ammonia dosing pump and a control valve are installed on the pipeline connecting the ammonia tank and the pre-precipitation device.

4. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A stirring mechanism is provided inside the mixing tank and the flocculation tank.

5. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A pH meter is installed in the mixing tank.

6. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A sedimentation outlet is provided below the mixing tank and the flocculation tank. A sludge conveying pipe is installed on the sedimentation outlet. A sludge conveying pump and a control valve are installed on the sludge conveying pipe.

7. The cold rolling PSA wastewater pre-precipitation system according to claim 6, characterized in that: The upper water outlet of the sedimentation tank is located above the sedimentation discharge port, and the upper water outlet of the sedimentation tank is located above the inlet of the clear liquid tank.

8. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A control valve is installed on the sulfuric acid discharge pipe.

9. The cold rolling PSA wastewater pre-precipitation system according to claim 1, characterized in that: A pH meter and a liquid level sensor are installed in the clear liquid pool.

10. The cold rolling PSA wastewater pre-sedimentation system according to any one of claims 1 to 9, characterized in that: A clear liquid delivery pump and a control valve are installed on the clear liquid delivery pipe.

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