Sewage lime sludge dehydration device for fatty acid production

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a sewage lime sludge dewatering device for fatty acid production, which comprises a raw water tank, a pH regulating tank, an air flotation machine and a lime sludge tank which are sequentially communicated through pipelines and pumps, the lime sludge tank is provided with a water outlet and a sludge outlet, the water outlet of the lime sludge tank is communicated to a feed port of the settling tank through a pipeline and a pump, a water outlet of the settling tank is communicated to the anaerobic tank, and a sludge outlet of the settling tank is communicated to the pH regulating tank through a pipeline and a pump; a sludge outlet of the lime sludge tank is communicated to a feeding hole of the plate-and-frame filter press through a pipeline and a pump, clear liquid obtained by the plate-and-frame filter press is communicated to the pH regulating tank through a pipeline, and sludge of the plate-and-frame filter press is sent out for treatment; and the feeding hole of the plate-and-frame filter press is also communicated with an air compressor through a pipeline. The water content of the sludge is fully reduced, the volume and the weight of the sludge are reduced, and the sludge is more convenient to transport.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a sewage lime mud dewatering device for fatty acid production. Background Technique

[0002] During the production process of fatty acids, a large amount of raw sewage with strong acidity is generated by high-pressure hydrolysis. These raw sewage need to be alkalized with quicklime before entering the anaerobic tank. After adding quicklime, sulfate ions and a small amount of grease in the raw water will react with quicklime to form lime mud. These lime mud need to be treated before entering the anaerobic tank, otherwise it will block the anaerobic tank and destroy the living environment of the microbial flora in the anaerobic tank. The sewage lime mud dewatering machine is a continuous sludge treatment equipment, which is suitable for the solid-liquid separation of sludge after flocculation and precipitation of wastewater generated during the fatty acid production process.

[0003] The sludge generated during the sewage treatment process by the sewage lime mud dewatering machine is still in a liquid flowing state and has a large volume after concentration or digestion. At present, in order to facilitate transportation and disposal, a plate and frame filter press is used to press and dehydrate it. The present technology provides a device to further reduce the moisture content, make the moisture content of the sludge as low as possible, dehydrate the sludge, and better reduce the volume and weight of the sludge for transportation. Summary of the Invention

[0004] The technical problem to be solved by the utility model is: to provide a sewage lime mud dewatering device for fatty acid production, which further reduces the moisture content of the sludge, increases the water removal amount by about 20% on the basis of the press filtration dehydration of the plate and frame filter press, so as to reduce the sludge volume and facilitate transportation.

[0005] To solve the above technical problem, the technical solution of the utility model is:

[0006] A sewage lime mud dewatering device for fatty acid production includes a raw water tank, a pH adjustment tank, a flotation machine and a lime mud tank connected in sequence through pipelines and pumps; the lime mud tank is provided with a water outlet and a sludge outlet. The water outlet of the lime mud tank is connected to the feed inlet of the sedimentation tank through a pipeline and a pump. The water outlet of the sedimentation tank is connected to the anaerobic tank, and the sludge outlet of the sedimentation tank is connected to the pH adjustment tank through a pipeline and a pump; the sludge outlet of the lime mud tank is connected to the feed inlet of the plate and frame filter press through a pipeline and a pump. The clear liquid obtained by the plate and frame filter press is connected to the pH adjustment tank through a pipeline, and the sludge of the plate and frame filter press is sent out for treatment; the feed inlet of the plate and frame filter press is also connected to an air compressor through a pipeline.

[0007] Preferably, the connection between the raw water tank and the pH adjustment tank is a pipeline centrifugal pump; the model of the pipeline centrifugal pump is IHG80-100A, and the manufacturer is Shandong Luyuan Pump Industry Co., Ltd.

[0008] Preferably, a sewage pump is provided at the connection between the lime sludge pond and the plate and frame filter press. The model of the sewage pump is 80WQ30-26-4, and the manufacturer is Shanghai People's Pump Industry Co., Ltd.

[0009] Preferably, the pumps between the pH adjustment tank and the air flotation machine, between the air flotation machine and the lime sludge pond, between the lime sludge pond and the sedimentation tank, between the sedimentation tank and the pH adjustment tank, and between the plate and frame filter press and the pH adjustment tank are all sewage pumps. The model is 80WQ30-26-4, and the manufacturer is Shanghai People's Pump Industry Co., Ltd.

[0010] Preferably, the pH adjustment tank is connected to a quicklime storage tank, and there is a stirrer in the pH adjustment tank. After the raw water with a pH value of 2-3 enters the pH adjustment tank, the pH of the raw water is adjusted to 10-12 by adding quicklime and stirring.

[0011] Preferably, the air flotation machine is connected to an external chemical dosing tank. By intermittently adding anionic polyacrylamide, the solid impurities and fine particles in the sewage are flocculated and settled.

[0012] Preferably, the model of the air compressor is W1.2 / 8, and the manufacturer is Shandong Delair Compressor Co., Ltd.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:

[0014] The present utility model separates the sewage generated in fatty acid production into clear liquid and sludge through a raw water tank, a pH adjustment tank, an air flotation machine and a lime sludge pond, then precipitates the clear liquid again, and returns the obtained sludge to the pH adjustment tank; the sludge obtained in the lime sludge pond is transported to a plate and frame filter press for pressure filtration. During pressure filtration, high-pressure air is continuously blown through an air compressor to remove the water in the sludge, so that the water content of the obtained sludge is reduced by about 20% compared with the sludge obtained only by pressure filtration with a plate and frame filter press, greatly reducing the water content of the sludge. Then, these sludges are sent out for treatment. Because a large amount of water is reduced, the volume and weight of the treated sludge are smaller and more convenient for transportation.

[0015] In short, the present utility model fully reduces the water content of the sludge, increasing the water removal amount by about 20% on the basis of the pressure filtration dehydration of the plate and frame filter press, so as to reduce the volume and weight of the sludge and make it more convenient for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0017] In the figure, 1, raw water tank; 2, pH adjustment tank; 3, air flotation machine; 4, lime sludge pond; 5, sedimentation tank; 6, anaerobic tank; 7, plate and frame filter press; 8, air compressor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Embodiment 1:

[0020] As Figure 1 shown, a sewage lime mud dehydration device for fatty acid production includes a raw water tank 1, a pH adjustment tank 2, a flotation machine 3, and a lime mud tank 4 that are sequentially connected through pipes (not marked) and pumps (not marked); the lime mud tank 4 is provided with a water outlet (not marked) and a sludge outlet (not marked). The water outlet of the lime mud tank 4 is connected to the feed inlet of a settling tank 5 through a pipe and a pump. The water outlet of the settling tank 5 is connected to an anaerobic tank 6. The mud outlet of the settling tank 5 is connected to the pH adjustment tank 2 through a pipe and a pump; the sludge outlet of the lime mud tank 4 is connected to the feed inlet of a plate and frame filter press 7 through a pipe and a pump. The clear liquid of the plate and frame filter press 7 is connected to the pH adjustment tank 2 through a pipe, and the sludge of the plate and frame filter press 7 is sent out for treatment (not marked); the feed inlet of the plate and frame filter press 7 is also connected to an air compressor 8 through a pipe.

[0021] During actual production: Raw water with a pH value of 2 - 3 in the raw water tank 1 enters the pH adjustment tank 2 through a pump. Quicklime is added to the pH adjustment tank 2, and after stirring, the pH of the raw water is adjusted to 10 - 12. The adjusted water enters the flotation machine 3 through a pump. Polyacrylamide anionic is dropped into the flotation machine 3 to flocculate the sludge in the water. The flocculated water enters the lime mud tank 4 through a pump for sedimentation. The sedimented sludge enters the plate and frame filter press 7 through a pump for filtration. The plate and frame filter press 7 is also connected to an air compressor 8, and the air compressor 8 is used to continuously blow the materials in the plate and frame filter press 7. This process can reduce 20% of the water in the sludge, greatly reducing the weight and volume of the sludge. Then, these sludges are sent out for treatment. The clear liquid obtained by filtering the plate and frame filter press 7 returns to the pH adjustment tank 2 through a pump;

[0022] The clear water sedimented in the lime mud tank 4 enters the settling tank 5 through a pump for re - sedimentation. The clear liquid enters each anaerobic tank 6 through a pump for anaerobic treatment. The sludge re - sedimented in the settling tank 5 returns to the pH adjustment tank 2 through a pump for reuse.

[0023] It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A device for dehydrating wastewater lime mud for fatty acid production, characterized in that: It comprises a raw water pool, a pH regulating pool, an air flotation machine and a lime mud pool which are connected in sequence through pipelines and pumps; the lime mud pool is provided with a water outlet and a sludge outlet, the water outlet of the lime mud pool is connected to the feed port of a sedimentation tank through pipelines and pumps, the water outlet of the sedimentation tank is connected to an anaerobic tank, and the mud outlet of the sedimentation tank is connected to the pH regulating pool through pipelines and pumps; the sludge outlet of the lime mud pool is connected to the feed port of a plate and frame filter press through pipelines and pumps, the clear liquid obtained by the plate and frame filter press is connected to the pH regulating pool through pipelines, and the sludge of the plate and frame filter press is sent out for treatment; the feed port of the plate and frame filter press is also connected to an air compressor through pipelines.

2. The device for dehydrating wastewater lime mud for fatty acid production as claimed in claim 1, characterized in that: The connection between the raw water tank and the pH adjustment tank is a pipeline centrifugal pump.

3. The device for dehydrating wastewater lime mud for fatty acid production as claimed in claim 1, characterized in that: The connection point between the lime mud pool and the plate and frame filter press is a sewage pump.

4. The device for dehydrating wastewater lime mud for fatty acid production as claimed in claim 1, characterized in that: The pumps between the pH adjustment tank and the air flotation machine, the air flotation machine and the lime mud pool, the lime mud pool and the sedimentation tank, the sedimentation tank and the pH adjustment tank, and the plate and frame filter press and the pH adjustment tank are all sewage pumps.

5. The device for dehydrating wastewater lime mud for fatty acid production as claimed in claim 1, characterized in that: The pH regulating pool is connected with a quicklime storage tank, and a stirrer is arranged in the pH regulating pool.

6. The device for dehydrating wastewater lime mud for fatty acid production as claimed in claim 1, characterized in that: The air flotation machine is connected to an external medicine adding tank.

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