Vacuum filtering device for high-solid-content difficult-to-separate wastewater

Abstract

The utility model relates to a vacuum filtering device for high solid content difficult-to-separate waste water, the device comprises a conditioning area, a filtering area, a vacuum area, a centrifugal pump, a venturi tube and a circulating water tank, the conditioning area is connected with the filtering area through a siphon, a filtering bag, a filtering membrane, a filtering plate and a filtering plate support are sequentially arranged between the filtering area and the vacuum area from top to bottom, and the centrifugal pump is connected with the venturi tube. The vacuum area is connected with the upper part of the circulating water tank through the centrifugal pump and the Venturi tube in sequence, an air inlet of the Venturi tube is respectively connected with the vacuum area and the siphon, and the lower part of the circulating water tank is connected with the vacuum area. The solid-liquid separation device is simple in structure and reasonable in design, is simple to operate through reasonable arrangement of the conditioning area, the filtering area, the vacuum area, the centrifugal pump, the Venturi tube and the circulating water tank, can effectively realize solid-liquid separation of high-solid-content difficult-to-separate wastewater (liquid), and saves investment and treatment cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a water treatment device, specifically relates to a kind of high solid content difficultly separated wastewater's vacuum filter device. BACKGROUND

[0002] In the sewage treatment process, high solid content is a common problem, which refers to the high content of solid matter in sewage. High solid content wastewater (ss>10000mg / L) may be produced in industrial production process, and these wastewaters generally need to be pretreated by solid-liquid separation before entering a wastewater treatment link. The effect of solid-liquid separation determines the cost of high solid content wastewater treatment and the effect of subsequent wastewater treatment.

[0003] Common solid-liquid separation methods include sedimentation, filtration, pressure filtration and centrifugation. Sedimentation is suitable for wastewater with medium or low solid content (generally ss<10000mg / L), filtration is suitable for wastewater with low solid content (generally ss<50mg / L), and pressure filtration and centrifugation are suitable for wastewater with high solid content (generally ss>10000mg / L). Pressure filtration and centrifugation have requirements for oil content and viscosity of wastewater. If the oil content or viscosity is too high, the filter cloth will be blocked. If a centrifuge is used, the solid and liquid cannot be separated.

[0004] Evaporated concentrated liquid with high organic matter content, cutting fluid with high oil content, and carbon black waste liquid containing dispersants cannot be separated by pressure filter or centrifuge. Because it is difficult to achieve solid-liquid separation, such waste liquids are generally treated as hazardous waste or require a large wastewater treatment system and other wastewater dilution post-treatment, which is high in cost and poor in effect.

[0005] In view of the difficulty of solid-liquid separation of high solid content wastewater (liquid), an effective solid-liquid separation device is needed to reduce the treatment cost and provide guarantee for subsequent treatment. CONTENT OF THE UTILITY MODEL

[0006] In order to overcome the shortcomings of the prior art, the utility model provides a vacuum filter device for high solid content difficultly separated wastewater.

[0007] The utility model adopts the technical scheme that:

[0008] A vacuum filter device for high solid content difficultly separated wastewater, the device comprises a conditioning zone, a filtration zone, a vacuum zone, a centrifugal pump, a Venturi tube and a circulating water tank, the conditioning zone is connected with the filtration zone through a siphon pipe, filter bags, filter membranes, filter plates and filter plate supports are sequentially arranged from top to bottom between the filtration zone and the vacuum zone, the vacuum zone is sequentially connected with the circulating water tank through the centrifugal pump and the Venturi tube, the air inlet of the Venturi tube is connected with the vacuum zone and the siphon pipe respectively, and the lower part of the circulating water tank is connected with the vacuum zone.

[0009] As preferred, the lower part of the vacuum zone is connected with the water inlet of the centrifugal pump, and the water outlet of the centrifugal pump is connected with the water inlet of the Venturi tube.

[0010] As preferred, the outlet of the Venturi tube is connected with the upper part of the circulating water tank, and the lower part of the circulating water tank is connected with the bottom of the vacuum zone.

[0011] As preferred, the lower part of the circulating water tank is connected with the bottom of the vacuum zone through a backflow pipe.

[0012] As preferred, the upper part of the circulating water tank is provided with an overflow water outlet.

[0013] As preferred, the upper part of the vacuum zone is provided with a vacuum gauge.

[0014] As preferred, the lower part of the vacuum zone is provided with a liquid level gauge.

[0015] As preferred, the liquid level gauge is a static pressure type liquid level gauge.

[0016] As preferred, a stirrer is installed in the conditioning zone.

[0017] The working principle of the utility model is as follows:

[0018] When working for the first time, the circulating water tank injects appropriate amount of water into the vacuum zone, the material enters the conditioning zone, the sludge conditioner is added and the stirrer is operated for conditioning, the centrifugal pump is started, the water in the vacuum zone is discharged into the circulating water tank through the Venturi tube, the circulating water is backflowed to the vacuum zone, the negative pressure is formed at the air inlet of the Venturi tube through Bernoulli principle, the air in the siphon pipe and the vacuum zone is sucked to form a vacuum, the conditioned material in the conditioning zone is discharged into the filtering zone through the siphon pipe, the material is intercepted by the filter membrane on the filter plate to form a filter cake, the filtrate enters the vacuum zone and is discharged into the circulating water tank through the centrifugal pump, when the overflow liquid level is exceeded, the overflow outlet is discharged, the filtration is completed, the centrifugal pump is closed to release the vacuum, and the filter cake is removed from the filtering zone through the filter bag.

[0019] The utility model has the advantages of simple structure, reasonable design, simple operation, effective realization of solid-liquid separation of high solid content difficult separation wastewater (liquid), and saving of investment and treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic view of the utility model. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model will be further specifically explained through the embodiments, and these embodiments are not a limitation on the utility model. Based on the embodiments in the application, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the application.

[0022] Example 1

[0023] Reference Figure 1 A kind of high solid content difficult to separate waste water vacuum filter device, the device includes conditioning area 1, filter area 4, vacuum area 9, centrifugal pump 12, Venturi tube 11 and circulating water tank 14, stirring device 2 is installed in conditioning area 1, conditioning area 1 is connected with filter area 4 by siphon 3, filter bag 5, filter membrane 6, filter plate 7 and filter plate support 8 are sequentially arranged from top to bottom between filter area 4 and vacuum area 9, vacuum table 10 is arranged in the upper portion of vacuum area 9, liquid level meter 11 is arranged in the lower portion of vacuum area 9, the liquid level meter uses static pressure type liquid level meter;The lower portion of vacuum area 9 is connected with the water inlet of centrifugal pump 12, the water outlet of centrifugal pump 12 is connected with the water inlet of Venturi tube 11, the air inlet of Venturi tube 11 is connected with vacuum area 9 and siphon 3 respectively, the outlet of Venturi tube 11 is connected with the upper portion of circulating water tank 14, the lower portion of circulating water tank 14 is connected with the bottom of vacuum area 9 through backflow pipe 16, overflow drain 15 is arranged in the upper portion of circulating water tank 14.

[0024] When working for the first time, inject appropriate amount of water into vacuum area 9 through circulating water tank 14, material enters conditioning area 1, add sludge conditioner to operate stirring device 2 for conditioning, start centrifugal pump 12, the water in vacuum area 9 is discharged into circulating water tank 14 through Venturi tube 11, the circulating water is backflowed to vacuum area 9, the air in siphon 3 and vacuum area 9 is sucked through the negative pressure formed by the air inlet of Venturi tube 11 according to Bernoulli principle, the conditioned material in conditioning area 1 is discharged into filter area through siphon 3, the material forms filter cake by being intercepted by filter membrane 6 on filter plate 7, the filtrate enters vacuum area 9 and is discharged into circulating water tank 14 through centrifugal pump 12, when exceeding overflow liquid level, it is discharged by overflow port 15, filtration is finished, centrifugal pump 12 is closed to release vacuum, filter cake is removed from filter area 4 through filter bag 5.

[0025] Example 2

[0026] The wastewater of a graphene production enterprise, the carbon black content in the wastewater is 6%, the dispersant content is 0.5%, the COD value is 9-10 million mg / L, it is black, it is difficult to settle, and it cannot be separated by general filtration.

[0027] The separation is carried out by using the device described in Embodiment 1, and in the first operation, water is injected into the vacuum area 9 through the circulating water tank 14 to half the liquid level, the material enters the conditioning area 1, the sludge conditioner is added and the stirring machine 2 is operated to carry out conditioning, the centrifugal pump 12 is started, the water in the vacuum area 9 is discharged into the circulating water tank 14 through the Venturi tube 11, the circulating water is returned to the vacuum area 9, the air in the vacuum area 9 is sucked through the negative pressure formed in the air inlet of the Venturi tube 11 according to the Bernoulli principle to form a vacuum, the conditioned material in the conditioning area 1 is discharged into the filtering area through the siphon 3, the material is intercepted by the filter membrane 6 on the filter plate 7 to form a filter cake, the filtrate is discharged through the overflow port 15 of the circulating water tank 14, the filtration is completed, the centrifugal pump 12 is turned off to release the vacuum, and the filter cake is removed from the filtering area 4 through the filter bag 5.

[0028] The separation process is simple and easy to operate, the solid-liquid separation effect reaches more than 99%, and the filtrate COD value is 6000-7000 mg / L.

[0029] Embodiment 3

[0030] The washing wastewater of a mechanical machining oil production enterprise contains emulsified oil, the COD value of the wastewater is 160-300 thousand mg / L, the wastewater is milky white, after pretreatment by adding iron salt, the proportion of the flocculation formed is more than 90%, the flocculation has no sedimentation, and the filter press cannot be used for pressure filtration.

[0031] Refer to Figure 1 , in the first operation, water is injected into the vacuum area 9 through the circulating water tank 14 to half the liquid level, the material enters the conditioning area 1, the conditioner is added and the stirring machine 2 is operated to carry out conditioning, the centrifugal pump 12 is started, the water in the vacuum area 9 is discharged into the circulating water tank 14 through the Venturi tube 11, the circulating water is returned to the vacuum area 9, the air in the vacuum area 9 is sucked through the negative pressure formed in the air inlet of the Venturi tube 11 according to the Bernoulli principle to form a vacuum, the conditioned material in the conditioning area 1 is discharged into the filtering area through the siphon 3, the material is intercepted by the filter membrane 6 on the filter plate 7 to form a filter cake, the filtrate enters the vacuum area 9 and is discharged into the circulating water tank 14 through the centrifugal pump 12, when the liquid level exceeds the overflow level, the filtrate is discharged through the overflow port 15, the filtration is completed, the centrifugal pump 12 is turned off to release the vacuum, and the filter cake is removed from the filtering area 4 through the filter bag 5.

[0032] The separation process is simple and easy to operate, the solid-liquid separation effect reaches more than 95%, and the filtrate COD value is 8000-10000 mg / L.

[0033] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vacuum filtration device for high solids content difficult to separate wastewater, characterized by: The device comprises a conditioning area, a filtering area, a vacuum area, a centrifugal pump, a Venturi tube and a circulating water tank, the conditioning area is connected with the filtering area through a siphon pipe, a filter bag, a filter membrane, a filter plate and a filter plate support are sequentially arranged from top to bottom between the filtering area and the vacuum area, the vacuum area is sequentially connected with the circulating water tank through the centrifugal pump and the Venturi tube, the air inlet of the Venturi tube is connected with the vacuum area and the siphon pipe respectively, and the lower part of the circulating water tank is connected with the vacuum area.

2. The vacuum filter device for high solid content and difficult separation wastewater according to claim 1, characterized in that: The lower part of the vacuum area is connected with the water inlet of the centrifugal pump, and the water outlet of the centrifugal pump is connected with the water inlet of the Venturi tube.

3. The vacuum filter device for high solid content and difficult separation wastewater according to claim 2, characterized in that: The outlet of the Venturi tube is connected with the upper part of the circulating water tank, and the lower part of the circulating water tank is connected with the bottom of the vacuum area.

4. The vacuum filter apparatus for high solid content and difficult separation wastewater according to claim 3, wherein: The lower part of the circulating water tank is connected with the bottom of the vacuum area through a backflow pipe.

5. The vacuum filter device for high solid content and difficult separation wastewater according to claim 1, characterized in that: The upper part of the circulating water tank is provided with an overflow drain.

6. The vacuum filter apparatus for high solid content and difficult separation wastewater according to claim 1, wherein: The upper part of the vacuum area is provided with a vacuum gauge.

7. The vacuum filter device for high solid content and difficult separation wastewater according to claim 6, characterized in that: The lower part of the vacuum area is provided with a liquid level meter.

8. The vacuum filter device for high solid content and difficult separation wastewater according to claim 7, characterized in that: The liquid level meter is a static pressure type liquid level meter.

9. The vacuum filter device for high solid content and difficult separation wastewater according to claim 1, characterized in that: A stirrer is installed in the conditioning area.

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