A pre-flocculation and concentration screw press dewatering device

Abstract

This invention provides a pre-flocculation and thickening screw press dewatering device, including a sludge tank, a sludge feed pump, a pipeline mixer, a pre-flocculation and thickening device, a dosing device, and a screw press. The feed end of the sludge feed pump is connected to the sludge tank; the feed end of the pipeline mixer is connected to the outlet end of the sludge feed pump, and the mixing end of the pipeline mixer is connected to the dosing device; the outlet end of the pipeline mixer is connected to the inlet at the top of the pre-flocculation and thickening device, and the sludge discharge port at the bottom of the pre-flocculation and thickening device is connected to the inlet of the screw press. The dosing device is also connected to the inlet of the screw press. This invention, with its mixing pipeline and pre-flocculation and thickening device, ensures stable sludge concentration before entering the screw press.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment, specifically to a pre-flocculation and concentration screw press dewatering device. Background Technology

[0002] Screw presses, as a mature sludge dewatering device, are widely used in sludge dewatering in various wastewater treatment processes, and are especially suitable for water treatment in food, oily, aquaculture, and municipal industries. Screw presses offer advantages such as low energy consumption, good continuity of operation, and strong adaptability.

[0003] The conventional screw press sludge dewatering process is relatively simple. The sludge feed pump pumps the sludge from the sludge tank into the mixing zone of the screw press, and at the same time, sludge conditioning agents (usually cationic polyacrylamide) are added. After the sludge and polyacrylamide are mixed, they are thoroughly stirred and reacted in the reaction zone. The sludge forms large flocs, and then it officially enters the screw press dewatering mechanism to achieve sludge-water separation and obtain dewatered sludge.

[0004] However, the concentration of the feed sludge directly affects the moisture content of the dewatered sludge. Conventional sludge tank and feed pump designs often result in extremely unstable feed sludge concentrations. The sludge in the tank may have a high moisture content, causing a significant drop in sludge concentration; or, as the suction process progresses, the feed pump may fail to draw sludge from the bottom of the tank, sometimes drawing high-concentration sludge clumps, and sometimes only drawing water. Therefore, the screw press requires frequent adjustments to operating parameters based on the sludge concentration, necessitating long-term monitoring by specialized technicians – a time-consuming and labor-intensive process. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a pre-flocculation and concentration dewatering device for a screw press, which includes a mixing pipe and a pre-flocculation and concentration device to ensure stable sludge concentration before entering the screw press.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pre-flocculation and thickening screw press dewatering device includes a sludge tank, a sludge feed pump, a pipeline mixer, a pre-flocculation and thickening device, a dosing device, and a screw press. The feed end of the sludge feed pump is connected to the sludge tank. The feed end of the pipeline mixer is connected to the outlet end of the sludge feed pump, and the mixing end of the pipeline mixer is connected to the dosing device. The outlet end of the pipeline mixer is connected to the inlet at the top of the pre-flocculation and thickening device, and the sludge discharge port at the bottom of the pre-flocculation and thickening device is connected to the inlet of the screw press. The dosing device is also connected to the inlet of the screw press.

[0008] Furthermore, a drain outlet is provided on the upper side of the pre-flocculation and concentration device.

[0009] Furthermore, an overflow weir is provided on the top periphery of the pre-flocculation and concentration device before the drain outlet, so that the flocculated sludge is blocked before the overflow weir.

[0010] Furthermore, a filter screen for blocking sludge is provided at the inlet of the drain outlet.

[0011] Furthermore, the dosing device includes a dosing pump and a dosing tank; the dosing pump is connected between the dosing tank and the pipeline mixer via a pipeline.

[0012] This invention discloses a pre-flocculation and concentration screw press dewatering device. The device pre-flocculates and concentrates the sludge, adding conditioning agents to ensure that the sludge concentration is within a stable range before entering the screw press for dewatering. This results in stable operating parameters for the screw press, eliminating the need for frequent adjustments. Furthermore, the pre-flocculation process saves on the use of conditioning agents, reducing raw material costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a pre-flocculation and concentration screw press dewatering device provided by this utility model. Detailed Implementation

[0014] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0015] Example 1

[0016] like Figure 1 As shown, the present invention provides a pre-flocculation and thickening screw press 6 dewatering device, including a sludge tank 1, a sludge feed pump 2, a pipeline mixer 3, a pre-flocculation and thickening device 4, a dosing device 5, and a screw press 6; the feed end of the sludge feed pump 2 is connected to the sludge tank 1; the feed end of the pipeline mixer 3 is connected to the outlet end of the sludge feed pump 2, and the mixing end of the pipeline mixer 3 is connected to the dosing device 5; the outlet end of the pipeline mixer 3 is connected to the inlet at the top of the pre-flocculation and thickening device 4, the sludge discharge port at the bottom of the pre-flocculation and thickening device 4 is connected to the inlet of the screw press 6, and the dosing device 5 is connected to the inlet of the screw press 6.

[0017] The most significant feature of this invention is the addition of a pipeline mixer 3 and a pre-flocculation and thickening device 4. During operation, the sludge feed pump 2 pumps sludge from the sludge tank 1 into the pipeline mixer 3. Simultaneously, the dosing device 5 adds conditioning agents to the pipeline mixer 3, ensuring thorough mixing and flocculation. The flocculated sludge-water mixture then remains in the flocculation and thickening device for initial sludge-water separation, resulting in sludge concentration.

[0018] The concentrated sludge at the bottom of the pre-flocculation and thickening unit 4 is continuously fed into the screw press 6 by gravity, while a second addition of conditioning agents is performed by the dosing device 5 for flocculation. Once the feed valve of the screw press 6 is adjusted, the feed flow rate can be kept stable by matching the flow rate of the sludge feed pump 2. Simultaneously, due to the pre-flocculation and thickening process, the feed concentration of the screw press 6 can also be kept stable. The operating parameters of the screw press 6 can remain stable for a long time without frequent adjustments. Furthermore, since the flocculation process requires reaction time, the sludge is treated with chemicals twice, before and after the initial addition, which can save on conditioning agents and reduce raw material costs.

[0019] Furthermore, a drain outlet 41 is provided on the upper side of the pre-flocculation and concentration device 4. The mud-water mixture in the pre-flocculation and concentration device 4 can achieve a relatively obvious separation effect, and the upper clear water can be returned through the drain outlet 41.

[0020] As a further preferred embodiment, the top periphery of the pre-flocculation and thickening device 4 is provided with an overflow weir 42 located before the drain outlet 41, so that the flocculated sludge is blocked before the overflow weir 42. The clean water overflows as the water level continues to rise and is then discharged through the drain outlet 41.

[0021] Alternatively, a filter screen (not shown) is provided at the inlet of the drain outlet 41 to block sludge, which can also ensure that the sludge remains in the device and flocculates.

[0022] Specifically, the dosing device 5 includes a dosing pump 51 and a dosing tank 52; the dosing pump 51 is connected between the dosing tank 52 and the pipe mixer 3 via a pipeline.

[0023] This utility model provides a pre-flocculation and concentration dewatering device for a screw press 6. By adding a pipeline mixer 3 and a pre-flocculation and concentration device 4 for the pre-flocculation process, the sludge can be pre-flocculated and its concentration stabilized before being fed into the screw press 6. This effectively ensures that the screw press 6 operates under stable parameters, eliminating the need for frequent adjustments. The increased feed concentration and reduced moisture content of the dewatered sludge improve processing efficiency. The two-stage flocculation and concentration process saves on conditioning agents and reduces raw material costs.

[0024] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pre-flocculated concentrated decanter dewatering device, characterized by: It includes a sludge tank, a sludge feed pump, a pipeline mixer, a pre-flocculation and thickening device, a dosing device, and a screw press; the feed end of the sludge feed pump is connected to the sludge tank; the feed end of the pipeline mixer is connected to the outlet end of the sludge feed pump, and the mixing end of the pipeline mixer is connected to the dosing device; the outlet end of the pipeline mixer is connected to the inlet at the top of the pre-flocculation and thickening device, the sludge discharge port at the bottom of the pre-flocculation and thickening device is connected to the inlet of the screw press, and the dosing device is connected to the inlet of the screw press.

2. The pre-flocculated concentrated decanter dewatering device of claim 1, wherein: The pre-flocculation and concentration device is provided with a drain outlet on the upper side.

3. The pre-flocculated concentrated decanter dewatering device of claim 2, wherein: An overflow weir is provided on the top periphery of the pre-flocculation and concentration device before the drain outlet, so that the flocculated sludge is blocked before the overflow weir.

4. The pre-flocculated concentrated decanter dewatering device of claim 2, wherein: The drain outlet inlet is equipped with a filter screen to block sludge.

5. The pre-flocculated concentrated decanter dewatering device of claim 1, wherein: The dosing device includes a dosing pump and a dosing tank; the dosing pump is connected between the dosing tank and the pipeline mixer via a pipeline.

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