CN221267381U - Device and wastewater treatment system for dehydrating wastewater containing ABS high rubber powder - Google Patents

Abstract

The device for dehydrating the wastewater containing the ABS high rubber powder comprises a wastewater collection tank and a vacuum belt dehydrator; the vacuum belt dehydrator comprises a conveyor belt and filter cloth paved outside the conveyor belt, a vacuum box is arranged below the conveyor belt, and the vacuum box is communicated with the upper part of the conveyor belt through a center small hole arranged on the conveyor belt; the bottom of the vacuum box is connected with a vacuum tank, the bottom of the vacuum tank is provided with a liquid draining interface, and the top of the vacuum tank is connected with a vacuum pump. The waste water containing the ABS high rubber powder is dehydrated by adopting the vacuum belt type dehydrator to carry out negative pressure filtration, the negative pressure suction direction is consistent with the gravity flow direction of water, the dehydration effect is better, the equipment can continuously run, the dehydration effect and the efficiency are improved, and the ABS high rubber powder is easier to recycle.

Description

Device and wastewater treatment system for dehydrating wastewater containing ABS high rubber powder

Technical Field

The utility model relates to the field of chemical equipment, in particular to a device for dehydrating wastewater containing ABS high rubber powder and a wastewater treatment system.

Background

The ABS resin is an acrylonitrile-butadiene-styrene copolymer, ABS is an acronym of Acrylonitrile Butadiene Styrene, and is a thermoplastic high-molecular material with high strength, good toughness and easy processing and forming. The method is used for preparing various parts such as instruments, electric appliances, machines and the like. The ABS resin production process mainly comprises a butadiene Polymerization (PBL) section, an emulsion grafting (HRG) section, a coagulation drying unit section, a SAN section and a blending granulation section. A large amount of organic sewage is produced in the production process of each working section, and the sewage has high organic matter content, complex components and difficult treatment.

In the process of treating the coagulated powder-containing wastewater generated in the coagulation unit section, because the wastewater has larger water quantity and is intermittently discharged, the wastewater contains a large amount of powder, the powder is commonly called ABS high rubber powder, and the main component is a ternary copolymer of styrene, butadiene and acrylonitrile, and the high rubber powder is mainly used for improving the ABS resin performance because the butadiene content in the composition is higher (the content is 68-70%). ABS high-glue powder is difficult to biochemically degrade, is unfavorable for subsequent biochemistry of sewage, and can be reused, so that recovery treatment is needed.

The current treatment process of the sewage containing powder by the coagulation unit comprises the following steps: after being collected by a powder sewage pool, the powder sewage is pumped into a plate-and-frame filter press for dehydration treatment by a feed pump, the dehydrated powder is recovered, and filtrate is collected to a sewage pretreatment unit through a pipeline and enters a subsequent process unit for continuous treatment.

The existing condensed powder-containing sewage is dehydrated by adopting plate-and-frame filter press equipment, the water content of the mud discharged after dehydration is still very high (generally 55-60%) due to the self structure of the plate-and-frame filter press and the characteristics of filter cloth materials and precision, the recycling difficulty is increased, the running process of the plate-and-frame filter press is generally divided into a plurality of stages of compacting a filter plate, a filter pressing process, loosening the filter plate, unloading the filter plate and cleaning the filter cloth, and continuous filtration cannot be realized.

In view of this, the present application has been made.

Disclosure of utility model

The utility model aims to provide a device for dehydrating waste water containing ABS high rubber powder and a waste water treatment system, which can improve the water content of mud discharged after dehydration and can realize the recovery of the ABS high rubber powder more easily.

Embodiments of the present utility model are implemented as follows:

In a first aspect, the utility model provides a device for dehydrating wastewater containing ABS high rubber powder, which comprises a wastewater collection tank and a vacuum belt dehydrator;

The vacuum belt dehydrator comprises a conveyor belt and filter cloth paved outside the conveyor belt, one end of the vacuum belt dehydrator is a feeding end, the other end of the vacuum belt dehydrator is a discharging end, the feeding end is provided with a feeding port connected with a sewage collecting tank, the discharging end is provided with a filter cake discharging assembly, a vacuum box is arranged below the conveyor belt between the feeding end and the discharging end, and the vacuum box is communicated with the upper part of the conveyor belt through a central small hole arranged on the conveyor belt;

The bottom of the vacuum box is connected with a vacuum tank, the bottom of the vacuum tank is provided with a liquid draining interface, and the top of the vacuum tank is connected with a vacuum pump.

In an alternative embodiment, a filter cake forming area, a filter cake washing area and a filter cake drying area are sequentially arranged on the corresponding conveyor belt above the vacuum box along the direction close to the filter cake discharging assembly, and a cleaning water inlet is arranged above the filter cake washing area.

In an alternative embodiment, the conveyor belt is provided with liquid collection grooves, more than two liquid collection grooves are arranged on the conveyor belt, and each liquid collection groove is communicated with the central small hole.

In an alternative embodiment, a distributor is arranged at the feed inlet, a distributing plate is arranged at the bottom of the distributor, and distributing holes are uniformly distributed on the distributing plate.

In an alternative embodiment, the filter cake discharging assembly comprises a discharging roller and a scraper, wherein a gap for the filter cloth to pass through is arranged between the discharging roller and the scraper, and the width of the gap is matched with the thickness of the filter cloth.

In an alternative embodiment, the filter cloth is a polypropylene filter cloth, and the mesh aperture of the filter cloth is 3-8 μm.

In an alternative embodiment, the filter cake removing device further comprises a filter cloth cleaning device, wherein the filter cake removing assembly is arranged on one side far away from the vacuum box, the filter cloth cleaning device comprises two supporting rollers and a spraying device arranged between the two supporting rollers, the two supporting rollers and the spraying device are arranged on one side of the filter cloth, and a filtrate collecting device is arranged below the filter cloth cleaning device.

In an alternative embodiment, a stirring device is arranged in the sewage collection tank.

In an alternative embodiment, the feed inlet is connected with the sewage collecting tank through a feed pipe, and a feed pump is further arranged on the feed pipe.

In a second aspect, the utility model provides an ABS resin production wastewater treatment system, comprising the apparatus for dehydrating ABS-high rubber powder-containing wastewater according to any one of the foregoing embodiments.

The embodiment of the utility model has the beneficial effects that:

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a device for dewatering wastewater containing ABS high rubber powder;

FIG. 2 is a schematic diagram of the connection of the vacuum belt dehydrator and vacuum tank of the present utility model.

Icon 100-sewage collection pool; 110-stirring device; 200-vacuum belt dehydrator; 210-a conveyor belt; 220-filtering cloth; 230-vacuum box; 240-a feed inlet; 250-a cake discharge assembly; 260-backing rolls; 270-spraying device; 280-a filtrate collection device; 300-vacuum tank; 400-vacuum pump; 500-feeding pipe; 510-feed pump.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

First embodiment

Referring to fig. 1 and 2, the present embodiment provides a device for dewatering wastewater containing ABS high-rubber powder, which includes a wastewater collection tank 100 and a vacuum belt dehydrator 200;

The vacuum belt dehydrator 200 comprises a conveyor belt 210 and filter cloth 220 paved outside the conveyor belt 210, wherein one end of the vacuum belt dehydrator 200 is a feeding end, the other end is a discharging end, the feeding end is provided with a feeding port 240 connected with the sewage collecting tank 100, the discharging end is provided with a filter cake discharging assembly 250, a vacuum box 230 is arranged below the conveyor belt 210 between the feeding end and the discharging end, and the vacuum box 230 is communicated with the upper part of the conveyor belt 210 through a central small hole arranged on the conveyor belt 210;

The bottom of the vacuum box 230 is connected with a vacuum tank 300, a liquid draining interface is arranged at the bottom of the vacuum tank 300, and the top of the vacuum tank 300 is connected with a vacuum pump 400.

The embodiment provides a device for dehydrating waste water containing ABS high rubber powder, because the waste water containing ABS high rubber powder is powder sewage obtained by cleaning and condensing waste gas, the powder in the waste water can be sold as a low-end product after being dehydrated, but because the advanced of the ABS resin production process and equipment exists, the powder cannot be much, so that the water content of the formed sewage is generally about 98%, namely the solid content is about 2%. For the vacuum belt dehydrator 200, the filter cake generated per unit time of the dehydrator with the same throughput is thin, and it is difficult to ensure a stable vacuum degree (0.05 MPa) during the operation of the dehydrator. And the condensed powder-containing wastewater is intermittently discharged, and the fluctuation of the water inlet is relatively large for the dehydrator. For this, the present application provides a sewage collection tank 100 to improve hydraulic retention time and water quality homogenizing effect. In addition, in some embodiments, the conveying belt 210 adopts a variable frequency speed regulation means to adjust the conveying speed of the conveying belt 210, and when the quality of the incoming material is unstable, the running speed of the filter belt is adjusted, so that a filter cake with stable and uniform thickness can be formed, and the running vacuum degree of the dehydrator can be ensured.

The vacuum belt dehydrator 200 in some embodiments is composed of a rubber conveyor belt 210, a vacuum box 230, a driving (host driving and frequency conversion speed regulation) roller, an adhesive tape supporting table, a feed hopper, a filter cloth 220 deviation adjusting device, a filter cloth 220 washing device, a frame and the like, and solid-liquid separation is realized by fully utilizing the gravity and vacuum suction of materials. Specifically, the conveyor belt 210 in the rubber belt type vacuum filter is driven by a driving roller, the driving roller is driven by a host machine to combine with variable frequency speed regulation so as to regulate the conveying speed of the conveyor belt 210, the filter cloth 220 is paved on the conveyor belt 210, and the filter cloth 220 and the conveyor belt 210 synchronously run between a feeding end and a discharging end. The vacuum box 230 is provided at a side of the rubber belt away from the filter cloth 220, and a sealing assembly is provided at the top of the conveyor belt 210 and the vacuum box 230, for example, using a water seal or the like, in order to maintain the vacuum degree of the vacuum box 230 without affecting the transfer of the conveyor belt 210, and a specific structure of the sealing assembly can be seen by those skilled in the art. The wastewater enters the filter cloth 220 of the vacuum belt dehydrator 200, when the vacuum tank 230 is connected with a vacuum system, a vacuum suction filtration area is formed on the adhesive tape, filtrate passes through the filter cloth 220 and enters the vacuum tank 230 through the center small hole, solid particles are trapped on the filter cloth 220 to form a filter cake, and liquid entering the vacuum tank 230 is discharged through the vacuum tank 300. The vacuum degree in the vacuum box 230 of the vacuum belt dehydrator 200 is controlled between 0.04 and 0.06MPa, and the mud water content can be controlled below 40% in the pressure range;

In some embodiments, a filter cake forming area, a filter cake washing area, and a filter cake suction area are sequentially disposed on the corresponding conveyor belt 210 above the vacuum box 230 along a direction approaching the filter cake discharging assembly 250, and a cleaning water inlet is disposed above the filter cake washing area.

The waste water containing ABS high rubber powder is transferred to the filter cloth 220 from the feed inlet 240, when the vacuum box 230 is connected with a vacuum system, a vacuum suction filtration area is formed on the conveyor belt 210, along with the movement of the conveyor belt 210, filter cakes are gradually formed, the formed filter cakes sequentially enter a filter cake washing area and a filter cake suction area, and finally, the filter cakes are separated from the filter cloth 220 at the filter cake discharging assembly 250, so that the dehydration of the waste water is completed.

In some embodiments, the conveyor belt 210 has more than two liquid collection grooves, each of which is in communication with the central aperture.

The wastewater passes through filter cloth 220 into a liquid collection trough on conveyor 210 and then into a central aperture and through the central aperture into vacuum box 230 where solid particles are trapped on filter cloth 220 to form a filter cake. In some embodiments, the liquid collection trough may be tapered in a direction toward the central aperture to facilitate liquid return at the entrance to the central aperture.

In some embodiments, a distributor is disposed at the feed inlet 240, a distributing plate is disposed at the bottom of the distributor, and distributing holes are uniformly distributed on the distributing plate. The original material distribution mode of the vacuum belt dehydrator 200 is changed into multi-point microporous material distribution, so that the material is more uniformly distributed on the filter cloth 220, and a filter cake layer with uniform thickness is formed, so that the vacuum degree of the operation of the dehydrator is ensured.

In some embodiments, the filter cake discharging assembly 250 includes a discharging roller and a scraper, and a gap for the filter cloth 220 to pass through is provided between the discharging roller and the scraper, and the width of the gap is adapted to the thickness of the filter cloth 220. The filter cloth 220 from which the filter cake is removed can be cleaned and regenerated, and then enters the filtering area again after passing through a set of supporting rollers and a deviation correcting device, and starts to enter a new filtering period.

In some embodiments, the filter cloth 220 is a filter cloth 220 made of polypropylene, and the mesh size of the filter cloth 220 is 3-8 μm. The filter cloth 220 of the vacuum belt machine dehydrator is made of polypropylene fiber material which is crossly woven by grids with the filtering precision of 3-8 mu m, is acid-base resistant and temperature resistant (90 ℃), and has wide application range.

In some embodiments, the filter cake removing assembly 250 further comprises a filter cloth 220 cleaning device, wherein the filter cloth 220 cleaning device is arranged on one side of the filter cake removing assembly 250 far away from the vacuum box 230, the filter cloth 220 cleaning device comprises two support rollers 260 and a spraying device 270 arranged between the two support rollers 260, the two support rollers 260 and the spraying device 270 are arranged on one side of the filter cloth 220, and a filtrate collecting device 280 is arranged below the filter cloth 220 cleaning device.

In some embodiments, the sewage collection tank 100 is provided with a stirring device 110.

The sewage collection tank 100 is internally provided with 1 stirrer, the power of the stirrer is designed and calculated according to the tank type and the water quantity, firstly, powder sewage deposition is prevented, secondly, the water quality and the water quantity are homogenized, the material property of the material which subsequently enters the vacuum belt dehydrator 200 is stable, the stirrer is normally open, and the fault alarm is given. The top of the sewage collecting tank 100 is provided with 1 radar liquid level meter, the liquid level meter is interlocked with the rear end feeding pump 510, the high liquid level starts the water pump, the low liquid level stops the pump, and if the liquid level in the sewage collecting tank 100 is higher than the high liquid level or lower than the low liquid level, the alarm is given. In some embodiments, the volume of the wastewater collection tank 100 is adjusted such that its hydraulic retention time is not less than 12 hours.

In some embodiments, the feed inlet 240 is connected to the sewage collecting tank 100 through a feed pipe 500, and a feed pump 510 is further disposed on the feed pipe 500.

The sewage feed pump 510 can be provided with 2 sewage feed pumps, and if two sewage feed pumps are provided, the sewage feed pumps can be used for one sewage feed pump and the sewage feed pumps can be used for the other sewage feed pumps. And alarming when the working pumps are in fault, and alarming when the two pumps are in fault at the same time.

When the device for dehydrating the wastewater containing the ABS high rubber powder works, the device comprises the following steps:

a. The condensed powder-containing sewage is firstly discharged through the device area and is collected by a pipeline to enter a sewage collecting tank 100;

b. The sewage in the sewage collecting tank 100 is lifted by the sewage feed pump 510 to be fed to the filter cloth 220 of the vacuum belt type dehydrator 200; the filtered liquid on the filter cloth 220 is sucked into the vacuum tank 300 by the vacuum pump 400;

c. An outlet is arranged on the vacuum tank 300 above the sewage, exhaust gas is pumped by the vacuum pump 400, the vacuum degree in the vacuum tank 300 is maintained, and the sewage is discharged from the lower part of the vacuum tank 300;

d. The gas discharged from the vacuum tank 300 can be discharged to the atmosphere or treated and then discharged to the atmosphere, and the sewage discharged from the vacuum tank 300 can be discharged into the floor drain in the lower cofferdam of several groups together with other sewage discharged from the equipment and collected to a sewage disposal tank for further treatment through pipelines.

E. waste gas is generated in the sewage collection tank 100, and the waste gas can be collected through a pipeline and discharged to a waste gas collection system to be treated together with other VOCs.

The device for dehydrating the wastewater containing the ABS high rubber powder has the following advantages:

The waste water containing the ABS high rubber powder is dehydrated by adopting the vacuum belt dehydrator 200 for negative pressure filtration, the negative pressure suction direction is consistent with the gravity flow direction of the water, the dehydration effect is better, and the polypropylene material and the 3-8 mu m precision filter cloth 220 are selected, so that the water content of the discharged mud is greatly reduced, the water content can be reduced to 40% from 60% of a plate-and-frame filter press, the recovery treatment difficulty is greatly reduced, and the recovery cost is reduced; in addition, pollutants in the filtrate, mainly SS and insoluble COD, are greatly reduced, the effluent is clear, the water quality is good, and the load of subsequent process devices is reduced.

The vacuum belt dehydrator 200 can perform continuous operation and continuous filtration in a real sense by continuously and synchronously carrying out material discharging, vacuum dehydration, filter cake washing and deslagging to the filter cloth 220 for cleaning.

The vacuum belt dehydrator 200 has only one discharge opening of about 300-400mm, has a high-level structure (about 1.3 m away from the equipment foundation), can directly discharge materials to a ton bag for collection which is supported below, saves collection equipment and occupied space, and has small contact area between materials discharged from the vacuum belt machine and the environment and much less odor due to filter pressing of the opposite plate frames.

Through the setting of anterior segment sewage collection pond 100 and agitator equipment for the hydroextractor incoming material is stable, and the improvement of multiple spot micropore cloth mode and the operating speed who adopts variable frequency adjustment conveyer belt 210, also can make the vacuum keep in the allowed range under the circumstances that the material moisture content is very high, the hydroextractor steady operation.

The negative pressure dehydration mode of the vacuum belt dehydrator 200 is adopted to replace the original plate-frame filter pressing positive pressure dehydration mode, is the first attempt of the dehydration of the ABS wastewater coagulated powder-containing sewage, has the most outstanding advantage that the mud water content can reach below 40 percent, and cannot be achieved by any other dehydration equipment at present.

Another embodiment of the present application provides an ABS resin production wastewater treatment system, including an apparatus for dehydrating wastewater containing ABS high rubber powder according to any one of the foregoing embodiments.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The device for dehydrating the wastewater containing the ABS high rubber powder is characterized by comprising a wastewater collection tank and a vacuum belt dehydrator;

The vacuum belt dehydrator comprises a conveyor belt and filter cloth paved outside the conveyor belt, one end of the vacuum belt dehydrator is a feeding end, the other end of the vacuum belt dehydrator is a discharging end, the feeding end is provided with a feeding port connected with a sewage collecting tank, the discharging end is provided with a filter cake discharging assembly, a vacuum box is arranged below the conveyor belt between the feeding end and the discharging end, and the vacuum box is communicated with the upper part of the conveyor belt through a central small hole arranged on the conveyor belt;

The bottom of the vacuum box is connected with a vacuum tank, the bottom of the vacuum tank is provided with a liquid draining interface, and the top of the vacuum tank is connected with a vacuum pump.

2. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein a filter cake forming area, a filter cake washing area and a filter cake sucking area are sequentially arranged on a corresponding conveyor belt above the vacuum box along the direction close to the filter cake removing assembly, and a cleaning water inlet is arranged above the filter cake washing area.

3. The apparatus for dewatering wastewater containing ABS high rubber powder according to claim 1 wherein a liquid collecting tank is provided on the conveyor belt, and two or more liquid collecting tanks are provided, each of the liquid collecting tanks being in communication with the center hole.

4. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein a distributing device is arranged at the feeding hole, a distributing plate is arranged at the bottom of the distributing device, and distributing holes are uniformly distributed on the distributing plate.

5. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein the filter cake removing assembly comprises a discharging roller and a scraper, a gap for the filter cloth to pass through is arranged between the discharging roller and the scraper, and the width of the gap is matched with the thickness of the filter cloth.

6. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein the filter cloth is a polypropylene filter cloth, and the mesh diameter of the filter cloth is 3-8 μm.

7. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, further comprising a filter cloth cleaning device provided at a side of the filter cake discharging assembly away from the vacuum box, the filter cloth cleaning device comprising two support rollers and a spray device provided between the two support rollers, both of the two support rollers and the spray device being provided at a side of the filter cloth, and a filtrate collecting device being provided below the filter cloth cleaning device.

8. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein a stirring device is arranged in the wastewater collection tank.

9. The device for dehydrating wastewater containing ABS high rubber powder according to claim 1, wherein the feed inlet is connected with the wastewater collection tank through a feed pipe, and a feed pump is further arranged on the feed pipe.

10. A wastewater treatment system comprising the apparatus for dewatering wastewater containing ABS high rubber powder according to any one of claims 1 to 9.