CN218321073U

CN218321073U - A processing system for handling contain dichlorobenzene waste water

Info

Publication number: CN218321073U
Application number: CN202222747917.0U
Authority: CN
Inventors: 高碧波; 吴亮; 吕林君; 宋子豪; 吴良彬; 陈耀; 陈小锋; 桂阿蒙
Original assignee: Zhejiang NHU Co Ltd; Zhejiang NHU Special Materials Co Ltd
Current assignee: Zhejiang NHU Co Ltd; Zhejiang NHU Special Materials Co Ltd
Priority date: 2022-09-27
Filing date: 2022-10-18
Publication date: 2023-01-17
Anticipated expiration: 2032-10-18

Abstract

The utility model relates to a processing system for handling waste water containing paradichlorobenzene, including the splitter that is used for separating waste water containing paradichlorobenzene in order to obtain paradichlorobenzene, the splitter includes the casing and forms phase splitting chamber and separating chamber in the casing, is provided with first median and second median in the separating chamber, and first median is used for the separation paradichlorobenzene and supplies water to pass through, and the second median is used for the separation water and supplies paradichlorobenzene to pass through; the first and second isolation belts divide an inner space of the separation chamber into first, second, and third chambers. The treatment system is used for treating wastewater containing p-dichlorobenzene, separating the wastewater in a separation device, standing and layering the wastewater in a phase separation chamber, allowing a water phase to enter a first chamber, and allowing the water to pass through a first isolation belt, enter a second chamber and then be discharged; the p-dichlorobenzene contained in the water phase is discharged after entering the third chamber through the second isolation belt, so that the p-dichlorobenzene is effectively recovered from the wastewater, the recovery effect is good, and the energy consumption is low.

Description

A processing system for handling contain dichlorobenzene waste water

Technical Field

The utility model belongs to the technical field of waste water treatment, concretely relates to a processing system for handling contain dichlorobenzene waste water.

Background

The p-dichlorobenzene is an important industrially used organic synthetic raw material, can be used in the fields of pesticides, pesticide intermediates, materials and the like, and is combustible, toxic and irritant.

In various fields at present, particularly in the fields of pesticides and materials, p-dichlorobenzene is used as a raw material and a solvent in large quantities, resulting in the generation of large quantities of p-dichlorobenzene wastewater. These wastewaters, if discharged directly to a sewage plant, are costly to dispose of and also result in waste of p-dichlorobenzene as a raw material.

In the prior art, some documents report treatment processes of p-dichlorobenzene wastewater, for example, chinese patent CN106478481A discloses an ultra-high purity separation and refining process of wastewater containing N-methylpyrrolidone and p-dichlorobenzene, which adopts a three-tower series-structure vacuum rectification system to separate and recover wastewater containing N-methylpyrrolidone and p-dichlorobenzene respectively, so as to obtain N-methylpyrrolidone, water and p-dichlorobenzene products with purity higher than 99.99%. The separation and purification process mentioned in the patent can purify and separate N-methylpyrrolidone, water and p-dichlorobenzene, but the energy consumption is huge. Under the circumstances of increasing shortage of energy resources, it is economically difficult to realize such a separation means.

Zhaoqiang refers to various methods for treating wastewater containing p-dichlorobenzene in the research progress of chlorobenzene and polychlorinated benzene wastewater treatment technologies, such as an adsorption method, a stripping method, a distillation method, an oxidation-reduction method, a membrane method and the like, and the wastewater purification is completed by mostly adopting a method of consuming p-dichlorobenzene, so that the realization means is complicated and the cost is high.

Disclosure of Invention

The utility model aims to solve the technical problem that to prior art not enough, provide a processing system for handling contain dichlorobenzene waste water, this processing system not only can effectively retrieve p dichlorobenzene and energy consumption low.

For solving the technical problem, the utility model discloses a following technical scheme:

a treatment system for treating p-dichlorobenzene-containing wastewater, the treatment system comprising a separation device for separating p-dichlorobenzene-containing wastewater to obtain p-dichlorobenzene;

the separation equipment comprises a shell, and an phase separation chamber and a separation chamber which are formed in the shell, wherein:

the phase separation chamber is provided with a wastewater inlet, a water storage space for standing wastewater and an outlet for dichlorobenzene;

the separation chamber is positioned on one side of the phase separation chamber, a first isolation belt and a second isolation belt are arranged in the separation chamber, the first isolation belt is used for blocking paradichlorobenzene and supplying water to pass through, and the second isolation belt is used for blocking water and supplying paradichlorobenzene to pass through; the first isolation belt and the second isolation belt divide the inner space of the separation chamber into a first chamber, a second chamber and a third chamber, wherein the first chamber is communicated with the side part of the phase separation chamber, the first isolation belt and the second isolation belt respectively form the side wall of the first chamber, the second chamber is surrounded by the first isolation belt and the shell, and the second chamber is provided with a water outlet; the third chamber is enclosed by the second isolation belt and the shell together, or enclosed by the first isolation belt, the second isolation belt and the shell together, and the third chamber is provided with a p-dichlorobenzene outlet.

According to some aspects of the present disclosure, the first chamber communicates with an upper side of the phase separation chamber.

Further, a partition plate is provided between the phase separation chamber and the first chamber, the partition plate constitutes a side wall common to the phase separation chamber and the first chamber, an upper end portion of the partition plate is separated from a top wall of the housing to form a passage through which the phase separation chamber and the first chamber communicate, and a distance H from the upper end portion of the partition plate to a bottom of the first chamber is 20cm or more. Preferably, the distance H between the upper end of the partition and the bottom of the first chamber is 20 to 25cm.

Further, the interface between the upper aqueous phase and the lower p-dichlorobenzene phase is lower than the upper end of the separator.

According to some embodiments of the present invention, the first isolation belt includes an upright portion extending in the up-down direction and a horizontal portion extending in the horizontal direction, the second isolation belt extends in the horizontal direction, and the horizontal portion of the first isolation belt and the second isolation belt constitute the top wall of the third chamber.

Further, the thickness of the upright portion of the first separator is 0.3 to 0.6cm, and preferably, the thickness of the upright portion of the first separator is 0.3 to 0.4cm.

Further, the thickness of the horizontal part of the first isolation belt is 0.5-1 cm. Preferably, the horizontal portion of the first isolation belt has a thickness of 0.5 to 0.8cm.

Further, the thickness of the second isolation belt is 0.5-4 cm. Preferably, the thickness of the second isolation belt is 1-3 cm.

According to some embodiments of the invention, the first isolation zone is a hydrophilic filtration material; the second isolation belt is made of hydrophobic filtering materials.

Further, the hydrophilic filtration material is hydrogel, silica gel, activated alumina, zeolite, activated carbon, fabric or sponge.

Further, the second isolation zone is a super-hydrophobic filter membrane.

Furthermore, the super-hydrophobic filter membrane comprises a regenerated cellulose membrane filter layer and a microcrystalline calcium carbonate and nano-silica composite layer arranged on the outer surface of the regenerated cellulose membrane filter layer, wherein a long-chain hydrophobic substance hexadecyl triethoxysilane is loaded on the surface of nano-silica of the composite layer.

According to the utility model discloses a in the aspect of further implementing, the splitter still include with the second room passes through the adsorption chamber of outlet intercommunication, be provided with adsorption material in the adsorption chamber.

In some embodiments, the adsorbent material is a combination of one or more of adsorbent resin, activated carbon, silica, alumina.

According to some implementation aspects of the utility model, the splitter still includes the cladding and is in the outlying heating jacket of casing makes the temperature of material is more than 57 ℃ in the casing.

According to some implementation aspects of the utility model, the splitter still including be used for the control in the phase separation chamber the interface height between upper water phase and the lower floor to the dichloro benzene looks level gauge.

Further, splitter still including connect on the casing and be used for supplying the inlet pipe that contains the dichlorobenzene waste water feeding, the export of the lower tip of inlet pipe is regarded as the waste water entry, the lower tip of inlet pipe is located in the phase separation chamber, just the filter is connected to the lower tip of inlet pipe, makes contain the dichlorobenzene waste water and filter earlier, then get into the layering of stewing in the phase separation chamber.

According to some implementation aspects of the utility model, processing system still includes water knockout drum and p-dichlorobenzene collecting tank, the water knockout drum has delivery port and p-dichlorobenzene export, the water knockout drum the delivery port with splitter the waste liquid entry intercommunication, the water knockout drum p-dichlorobenzene export with splitter the p-dichlorobenzene export respectively with p-dichlorobenzene collecting tank intercommunication.

The method for treating the p-dichlorobenzene-containing wastewater by using the treatment system comprises the step of separating the p-dichlorobenzene-containing wastewater by using a separation device to obtain p-dichlorobenzene, wherein during separation, the p-dichlorobenzene-containing wastewater enters the phase-separation chamber from the wastewater inlet and stands still in the phase-separation chamber for layering, the upper layer is a water phase, the lower layer is a p-dichlorobenzene phase, the water phase then enters the first chamber, and water entering the water phase in the first chamber further enters the second chamber through the first isolation belt and then is discharged from the water outlet; the p-dichlorobenzene contained in the water phase entering the first chamber passes through the second isolation belt to enter the third chamber and then is discharged from a p-dichlorobenzene outlet of the third chamber.

Further, the temperature of the p-dichlorobenzene-containing wastewater entering the phase separation chamber is controlled to be 58-100 ℃.

Further, the flow rate of the p-dichlorobenzene-containing wastewater entering the phase separation chamber is controlled to be 7 t/h-15 t/h. Preferably, the flow rate of the p-dichlorobenzene-containing wastewater entering the phase separation chamber is controlled to be 7 t/h-13 t/h.

Further, the mass concentration of p-dichlorobenzene in the p-dichlorobenzene-containing wastewater entering the phase separation chamber is controlled to be 1000-90000 ppm.

Further, the wastewater containing the p-dichlorobenzene is controlled to continuously enter the phase separation chamber through the wastewater inlet.

Further, the water outlet is controlled to be in a negative pressure state.

Further, the mass concentration of the p-dichlorobenzene in the p-dichlorobenzene-containing wastewater entering the water separator is more than 90000ppm.

Because of the application of the technical scheme, compared with the prior art, the utility model has the advantages of it is following:

when the treatment system of the utility model is adopted to treat the wastewater containing paradichlorobenzene, the wastewater containing paradichlorobenzene is kept stand and layered in the phase splitting chamber when the wastewater containing paradichlorobenzene is separated by the separation equipment, the wastewater enters the first chamber after the water phase, and the water in the wastewater passes through the first isolation belt and enters the second chamber to be discharged; the p-dichlorobenzene contained in the water phase enters the third chamber through the second isolation belt and is discharged.

By adopting the treatment system of the utility model to treat the wastewater containing the paradichlorobenzene, the paradichlorobenzene in the wastewater can be effectively recovered by combining standing, separation and adsorption, on one hand, the mass concentration of the paradichlorobenzene in the wastewater can be reduced to be below 0.5ppm, the national standard of wastewater discharge is reached, the treatment in the next step is convenient, and the pollution to the environment is reduced; on the other hand, resource waste is avoided. In addition, compare current processing system, adopt the utility model discloses a processing system handles, and energy resource consumption obviously reduces, can practice thrift the cost in the economy.

Drawings

FIG. 1 is a schematic view showing the construction of a treatment system for treating wastewater containing p-dichlorobenzene according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the separation apparatus of FIG. 1;

in the figure, 100, the separation device;

1. a housing; 2. a phase splitting chamber; 3. a separation chamber; 3a, a first chamber; 3b, a second chamber; 3c, a third chamber; 4. an adsorption chamber; 5. adsorbing material; 6. a waste water inlet; 7. a p-dichlorobenzene outlet; 7a, a first p-dichlorobenzene outlet; 7b, a second p-dichlorobenzene outlet; 8. a water outlet; 9. a partition plate; 10. a first isolation zone; 10a, a standing part; 10b, a horizontal part; 10c, a first extension; 10d, a second extension; 11. a second isolation zone; 12. a channel; 13. a liquid level meter; 14. a feed pipe; 15. a filter; 16. a heating jacket;

200. a water separator; 300. a p-dichlorobenzene collection tank; 400. a buffer tank; 500. a delivery pump.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments:

the treatment system for treating wastewater containing p-dichlorobenzene as shown in fig. 1-2 comprises a separation device 100, wherein the separation device 100 is used for separating the wastewater containing p-dichlorobenzene to obtain p-dichlorobenzene.

As shown in fig. 2, the separation apparatus 100 includes a housing 1, and an phase separation chamber 2 and a separation chamber 3 formed in the housing 1, wherein:

the phase separation chamber 2 is provided with a wastewater inlet 6, a water storage space for standing wastewater and an outlet 7 for dichlorobenzene;

the separation chamber 3 is positioned at one side of the phase separation chamber 2, a first isolation strip 10 and a second isolation strip 11 are arranged in the separation chamber 3, the first isolation strip 10 is used for blocking paradichlorobenzene and supplying water to pass through, and the second isolation strip 11 is used for blocking water and supplying paradichlorobenzene to pass through; the first isolation belt 10 and the second isolation belt 11 divide the internal space of the separation chamber 3 into a first chamber 3a, a second chamber 3b and a third chamber 3c, wherein the first chamber 3a is communicated with the side part of the phase separation chamber 2, the first isolation belt 10 and the second isolation belt 11 respectively form the side wall of the first chamber 3a, the second chamber 3b is enclosed by the first isolation belt 10 and the shell 1, and the second chamber 3b is provided with a water outlet; the third chamber 3c is enclosed by the second separating strip 11 and the housing 1, or the third chamber 3c is enclosed by the first separating strip 10, the second separating strip 11 and the housing 1, the third chamber 3c having a p-dichlorobenzene outlet 7.

When the wastewater containing p-dichlorobenzene is separated, the wastewater containing p-dichlorobenzene enters the phase separation chamber 2 from the wastewater inlet 6 and stands still in the phase separation chamber 2 for layering, wherein the upper layer is a water phase, the lower layer is a p-dichlorobenzene phase, the water phase enters the first chamber 3a, water in the water phase entering the first chamber 3a further enters the second chamber 3b through the first isolation belt 10, and then is discharged from the water outlet; the p-dichlorobenzene contained in the aqueous phase entering the first chamber 3a then passes through the second isolation strip 11 into the third chamber 3c and is then discharged from the p-dichlorobenzene outlet 7 of the third chamber 3 c.

After entering the phase separation chamber 2, the wastewater containing p-dichlorobenzene is separated into an upper water phase and a lower p-dichlorobenzene phase under the action of gravity, and the lower p-dichlorobenzene phase is discharged out of the shell 1. The upper water phase enters the first chamber 3a, and then the water in the first chamber reaches the second chamber 3b through the first isolation belt 10, is adsorbed by the adsorbing material and is discharged out of the shell 1; and the paradichlorobenzene therein passes through the second isolation belt 11 to the third chamber 3c and is discharged out of the housing 1. Through simple operation, the p-dichlorobenzene in the waste water can be gathered and recovered, and meanwhile, the content of organic matters in the waste water is greatly reduced, so that the p-dichlorobenzene-containing waste water can be conveniently and quickly treated.

For convenience of description, the p-dichlorobenzene outlet 7 corresponding to the phase separation chamber 2 is referred to as a first p-dichlorobenzene outlet 7a, the p-dichlorobenzene outlet 7 corresponding to the third chamber 3c is referred to as a second p-chlorobenzene outlet 7b, the first p-dichlorobenzene outlet 7a is located at the bottom of the phase separation chamber 2, and the second p-chlorobenzene outlet 7b is located at the bottom of the third chamber 3 c.

The separation apparatus 100 further includes an adsorption chamber 4 communicating with the second chamber 3b through a water discharge port of the second chamber 3b, an adsorbent 5 is provided in the adsorption chamber 4, the adsorption chamber 4 is located on a side of the second chamber 3b, and the adsorption chamber 4 has a water discharge port 8.

When separation is carried out, wastewater containing p-dichlorobenzene enters the phase separation chamber 2 from the wastewater inlet 6 and stands and stratifies in the phase separation chamber 2, wherein the upper layer is a water phase, the lower layer is a p-dichlorobenzene phase, the p-dichlorobenzene phase at the lower layer is discharged from the first p-dichlorobenzene outlet 7a, the water phase enters the first chamber 3a, water and trace organic matters dissolved in the water phase entering the first chamber 3a further enter the second chamber 3b through the first isolation belt 10, and then the water is discharged to the adsorption chamber 4 from the water outlet and is discharged from the water outlet 8 after being adsorbed by the adsorption material 5 in the adsorption chamber 4; the p-dichlorobenzene and small amounts of water contained in the aqueous phase entering the first chamber 3a then pass through the second isolation strip 11 into the third chamber 3c and then out of the second p-dichlorobenzene outlet 7b of the third chamber 3c, while small amounts of water still float on the upper surface due to density differences in the third chamber 3c and then pass through the first isolation strip 10 into the second chamber 3b.

As shown in FIG. 2, the first chamber 3a communicates with the upper side portion of the phase separation chamber 2, and in this example, a partition plate 9 is provided between the phase separation chamber 2 and the first chamber 3a, the partition plate 9 constituting a side wall common to the phase separation chamber 2 and the first chamber 3a, and an upper end portion of the partition plate 9 is separated from the ceiling wall of the housing 1 to form a passage 12 communicating the phase separation chamber 2 and the first chamber 3 a. The distance H between the upper end of the partition 9 and the bottom of the first chamber 3a is one of the key parameters for the separation of p-dichlorobenzene by the second isolation belt 11, and the height thereof is the lowest liquid level at which the separation can be completed by the second isolation belt 11, and the minimum height thereof must be larger than the lowest liquid level at which the separation can be completed by the first chamber 3 a. The effect of the different liquid levels is mainly that the hydrostatic pressure acting on the second isolation zone 11 is different ^[2] The higher the liquid level, the greater the velocity of the fluid flowing through the second isolation belt 11 and squeezing out the water that has flowed into the third chamber 3c into the second chamber 3b. Referring to fig. 2, the distance H is at least 20cm, and the highest height of the partition 9 does not contact the inner top wall of the case 1, and preferably, the distance H is 20 to 25cm.

In this example, the third chamber 3c is located directly below both the first chamber 3a and the second chamber 3b.

As shown in fig. 2, the first isolation band 10 includes an upright portion 10a extending in the vertical direction, a horizontal portion 10b folded from a lower end portion of the upright portion 10a to the side and extending in the horizontal direction, a first extending portion 10c folded from an upper end portion of the upright portion 10a to the side and extending in the horizontal direction, and a second extending portion 10d folded from an end portion of the first extending portion 10c to the top and extending upward, and the first extending portion 10c and the horizontal portion 10b are respectively located on both sides of the upright portion 10 a. The provision of the first extension portion 10c and the second extension portion 10d helps increase the contact area of the first separator 10 with the liquid.

The first extending portion 10c constitutes a ceiling wall of the first chamber 3a, the upright portion 10a constitutes a side wall of the first chamber 3a, the second isolation belt 11 constitutes a bottom wall of the first chamber 3a, and the horizontal portion 10b and the second isolation belt 11 constitute ceiling walls of the third chamber 3c, respectively.

The first isolation band 10 is made of a hydrophilic filter material including, but not limited to, at least one of hydrogel, silica gel, activated alumina, zeolite, activated carbon, fabric, and sponge. The first release tape 10 is commercially available.

Specifically, the thicknesses of the upright portion 10a, the first extending portion 10c, and the second extending portion 10d of the first separator 10 are 0.3 to 0.6cm, respectively, and preferably 0.3 to 0.4cm; the horizontal portion 10b of the first isolation zone 10 has a thickness of 0.5 to 1cm, preferably 0.5 to 0.8cm.

The second separator 11 is a superhydrophobic filter membrane, which is commercially available.

During the specific design, the second isolation belt 11 can be replaced according to the flow of the p-dichlorobenzene-containing wastewater entering the shell 1 and the concentration of p-dichlorobenzene in the wastewater to ensure the separation and aggregation effects. It is first explained that the pressures of the first and

second separator belts

10 and 11 are different for different flow rates, and the rate at which the separator belts can perform the aggregation separation is constant for a given material and thickness of the separator belts. The flow rate is too large or too small, which causes the separation abnormality. The large flow rate results in a high speed of fluid passing through the separator and an increase in the amount of entrainment between the outlet 8 and the second p-dichlorobenzene outlet 7b corresponding to the third chamber 3 c. The flow rate is too low and the second isolation zone 11 cannot complete the aggregation process in time, resulting in an increase in the mass concentration of p-dichlorobenzene in the water in the second chamber 3b.

In addition, the concentration range of the paradichlorobenzene in the paradichlorobenzene-containing wastewater entering the shell 1 is limited to a certain extent, when the concentration is higher than a certain value, the separation equipment is not used for separation treatment in a process view, otherwise, the replacement frequency of each isolation zone is increased; on the other hand, when the concentration is less than a certain value, a liquid film of p-dichlorobenzene is not formed on the second separator 11, and the p-dichlorobenzene discharged from the p-dichlorobenzene outlet 7 corresponding to the third chamber 3c contains a large amount of water. The separation effect can be adjusted by adjusting the thickness of the second isolation belt 11, the larger the flow rate is, the thicker the second isolation belt 11 is, and the smaller the concentration is, the thicker the second isolation belt 11 is. When the flow is increased by 1t/h, the thickness of the second isolation belt 11 is increased by 0.01 cm-1 cm; the thickness of the second isolation belt 11 increases by 0.01cm to 0.1cm for every 1000ppm reduction in concentration. The thicker the thickness, the more fluid barrier and the more water barrier than p-dichlorobenzene.

Preferably, the flow rate of the separation device 100 is 7t/h to 15t/h, and the mass concentration of the p-dichlorobenzene in the wastewater entering the separation device 100 is 1000ppm to 90000ppm. The thickness of the second separator 11 is 0.5 to 4cm, preferably 1 to 3cm. The thickness is designed according to the design flow, the concentration of p-dichlorobenzene and the material of the isolation belt ^[1] 。

In some embodiments, the separation apparatus further comprises a heating jacket 16 covering the periphery of the housing 1, a liquid level meter 13 and a feed pipe 14 connected to the housing 1, wherein the heating jacket 16 makes the temperature of the material in the housing 1 higher than 57 ℃, the liquid level meter 13 is used for monitoring the interface height between the water phase and the p-dichlorobenzene phase in the phase separation chamber 2, the feed pipe 14 is used for feeding the p-dichlorobenzene-containing wastewater, the outlet of the feed pipe 14 is used as the wastewater inlet 6, the lower end part of the feed pipe 14 extends into the phase separation chamber 2 from the top of the phase separation chamber 2, and the lower end part of the feed pipe 14 is connected with a filter 15 for removing impurities.

The adsorbent 5 may be adsorbent resin, silica, alumina, or activated carbon.

Referring to fig. 1, the treatment system further includes a water separator 200 and a paradichlorobenzene collecting tank 300, the water separator 200 has a water outlet and a paradichlorobenzene outlet, the water outlet of the water separator 200 is connected with the feeding pipe 14 through a connecting pipe, the paradichlorobenzene outlet of the water separator 200, a first paradichlorobenzene outlet 7a corresponding to the phase separation chamber 2 and a second paradichlorobenzene outlet 7b corresponding to the third chamber 3c are respectively communicated with the paradichlorobenzene collecting tank 300, and a delivery pump is arranged on the connecting pipe between the water separator 200 and the separation equipment 100.

In some embodiments, the treatment system further includes a buffer tank 400, the outlet 8 of the separation apparatus 100 is connected to the buffer tank 400 through a connection pipe, the outlet of the separation apparatus 100 enters the buffer tank 400, because during the actual treatment process, little p-dichlorobenzene may remain in the outlet of the separation apparatus 100, after a long treatment time, p-dichlorobenzene may settle at the bottom of the buffer tank 400, the water at the upper part of the buffer tank 400 is conveyed to a wastewater treatment center by a conveying pump 500 for further treatment, a connection pipe is connected between the bottom of the buffer tank 400 and the water inlet end of the water separator 200 for conveying the p-dichlorobenzene at the bottom of the buffer tank 400 to be mixed with the wastewater containing high-concentration p-dichlorobenzene and then enter the water separator 200, wherein the mass concentration of the p-dichlorobenzene in the wastewater containing high-concentration p-dichlorobenzene and entering the water separator 200 is greater than 90000ppm.

A method for treating p-dichlorobenzene-containing wastewater by using the treatment system will be described with reference to the treatment systems shown in FIGS. 1 to 2.

In some embodiments, a method of treating p-dichlorobenzene-containing wastewater comprises the steps of:

step S1, conveying the high-concentration p-dichlorobenzene-containing wastewater to a water separator 200 for preliminary p-dichlorobenzene and water separation, obtaining a p-dichlorobenzene phase at the bottom of the water separator 200, obtaining a water phase at the upper part of the water separator 200, discharging the p-dichlorobenzene phase at the bottom of the water separator 200 through a p-dichlorobenzene outlet of the water separator 200, conveying the p-dichlorobenzene phase into a p-dichlorobenzene collecting tank 300, and conveying the water phase at the upper part of the water separator 200 to a separation device 100 through a conveying pump 500. In the process, attention is paid to the interface position of the p-dichlorobenzene and the water, which cannot exceed the pipe orifice position of the connecting pipeline, because the continuous feeding is adopted, the separation effect in the water separator 200 is limited only by the gravity, and the mass concentration of the p-dichlorobenzene in the wastewater treated by the water separator 200 is more than 10000ppm.

Step S2, conveying the wastewater treated by the water separator 200 to the separation equipment 100 through a conveying pump for concentration and aggregation of p-dichlorobenzene, wherein in the step, the flow entering the separation equipment 100 needs to be adjusted to be not more than the saturated flow of the separation equipment 100 (the saturated flow is the maximum flow (namely the treatment capacity) of the separation equipment 100), the mass concentration of p-dichlorobenzene in the wastewater treated by the separation equipment 100 is less than 0.5ppm, conveying the wastewater treated by the separation equipment 100 into a buffer tank 500 through the conveying pump, then overflowing the wastewater out of the buffer tank 500 and discharging the wastewater to a sewage station; the p-dichlorobenzene obtained after the treatment by the separation device 100 is transported to the p-dichlorobenzene collecting tank 300 to be collected.

In order to prevent the p-dichlorobenzene from crystallizing and blocking the pipeline, hot water with the temperature of more than 80 ℃ is introduced into the heating jacket 16 of the separation equipment 100 for heat tracing so as to ensure that the temperature of the outlet water outlet 8 of the separation equipment 100 is more than 57 ℃, and all connecting pipelines need to adopt heat preservation measures, and rock wool and polyurethane foam can be used for heat preservation.

In the implementation and use, the material of the shell 1 of the separation equipment 100 can be 361L, the working temperature of the wastewater entering the separation equipment 100 is less than 100 ℃, the pressure-bearing design pressure of the shell 1 is less than 0.6MPa, after the related design is carried out on each isolation zone in the separation equipment 100, the isolation efficiency is over 99 percent, and the replacement time of each isolation zone is different according to different media and actual fluid flow, generally more than 0.5 year/time. The time for replacing the adsorbing material is considered according to the flow and the concentration, and when the concentration of organic matters in the outlet water of the outlet water outlet 8 of the separation device 100 is more than 200ppm, the adsorbing material is replaced. In addition, the outlet 8 needs to be in a negative pressure state to ensure that there is enough pressure difference to enable the waste water to be discharged out of the housing 1 through the adsorbing material, and the minimum vacuum degree is 20kPa.

The present invention is further described with reference to the following specific application examples, which, however, do not represent the limiting point of the present invention. Any modification, equivalent replacement, improvement and the like made within the flow and principle of the present invention shall be included in the protection scope of the present invention.

Example 1

In this example, p-dichlorobenzene-containing wastewater was continuously treated by the above-mentioned method using the treatment system of FIGS. 1 to 2. And control instruments such as a flowmeter, a thermometer and the like are arranged on each connecting pipeline.

The flow rate of the p-dichlorobenzene-containing wastewater treated by the embodiment is 10t/h, the mass concentration of p-dichlorobenzene in the wastewater is 10000ppm, and the flow rate and the concentration are in the range capable of being treated by the separation equipment 100, so that the p-dichlorobenzene-containing wastewater is directly treated by the separation equipment 100 without passing through the water separator 200.

In this example, the aperture of the filter hole of the filter 15 connected to the feed pipe 14 is 100 mesh; the thicknesses of the upright part 10a, the first extension part 10c and the second extension part 10d, which are sponge-like, of the first isolation belt 10 are 0.3cm, and the thickness of the horizontal part 10b is 1cm; the second isolation belt 11 is a super-hydrophobic filter membrane with the thickness of 1.2cm; the distance H between the top of the partition 9 and the bottom of the first chamber 3a is 20cm; the adsorbent 5 is silica.

As a result: the wastewater containing the paradichlorobenzene is continuously introduced into the shell 1 through the waste liquid inlet 6 at the flow rate of 10t/h, the flow rate of the paradichlorobenzene discharged through the first paradichlorobenzene outlet 7a corresponding to the phase separation chamber 2 is 2.6kg/h, the flow rate of the paradichlorobenzene discharged through the second paradichlorobenzene outlet 7b corresponding to the third chamber 3c is 8kg/h, the flow rate of water is 0.06kg/h, and the discharged water after adsorption is discharged through the water outlet 8. After running for 24 hours, the test results are shown in Table 1.

The following detection method is adopted for detection:

1. the moisture test method of the refractometer comprises the following steps: 1) The room temperature is adjusted to about 20 ℃, and a refractive index instrument is started. After stabilization, zero setting is carried out. And (5) dripping distilled water, and automatically reminding the completion of the system after deducting the background. 2) And (3) sample testing: and opening the lofting plastic cover, wiping water in the prism by using a paper towel, dripping 2-3 drops of a sample (only the prism is covered), pressing a start key, and then jumping out of the test result after the system is finished. The data is recorded.

2. Gas chromatography test of p-dichlorobenzene content: preparing gas phase solution, firstly cleaning a bottle, taking 0.02g of internal standard substance chlorobenzene by a rubber head dropper, then adding 2g of mother liquor supernatant, shaking up, carrying out capillary chromatographic column, heating the column at 100 ℃, adopting a programmed heating (100 ℃/15min, heating to 220 ℃, keeping for 35min, a vaporization chamber at 250 ℃, a detection chamber at 250 ℃,2.5ml/min high-purity nitrogen, 40ml/min high-purity hydrogen, 300ml/min air and a split ratio of 10,. And (5) after the mother liquor is removed for 43min, the reference chromatographic chart corresponding to the gas phase peak is calculated. And substituting the area ratio into a standard curve to calculate the content.

Example 2

The present embodiment basically refers to the processing system and method of embodiment 1 to perform continuous processing, and the difference is that: the flow rate was 12t/h, the run was 72h, and the measurements were performed after 24h and 72h, respectively, and the results are shown in Table 1.

Example 3

The present embodiment basically refers to the processing system and method of embodiment 2 to perform continuous processing, and the difference is that: the thickness of the second isolation zone 11 was set to 1.8cm, the adsorbent in the adsorption chamber 4 was replaced, the operation was carried out for 72 hours, and the results of the measurements were carried out after 24 hours and 72 hours of the operation, respectively, and are shown in table 1.

As can be seen from the detection results of examples 1 and 2, as the flow rate increases, the p-dichlorobenzene collected by the second isolation belt 11 is extruded again through the horizontal portion 10b of the first isolation belt and is taken out of the housing 1 by the water, which increases the concentration of the p-dichlorobenzene in the effluent of the effluent outlet 8, but due to the adsorption relationship of the adsorption material, the concentration of the p-dichlorobenzene in the effluent of the effluent outlet 8 will not increase in a short time, and after the adsorption material is saturated after a long time, the wastewater concentration will not reach the discharge standard. After the isolation belt is replaced, the separation task can be achieved.

Example 4

The present embodiment basically refers to the processing system and method of embodiment 1 to perform continuous processing, and the difference is that: the flow rate is 7t/h, and the detection is carried out after 24h operation, and the result is shown in Table 1.

Example 5

This example basically refers to the processing system and method of example 1 for continuous processing, with the following differences: the flow rate was 15t/h and the thickness of the second isolation belt 11 was 1.8cm. After running for 24 hours, the test results are shown in Table 1.

Example 6

This example basically refers to the processing system and method of example 1 for continuous processing, with the following differences: the flow rate was 15t/h and the thickness of the second isolation zone 11 was 4cm. After running for 24h, the results are shown in Table 1.

As can be seen from the test results of examples 1, 5 and 6, the flow rate is increased to 15t/h, and the separation requirement cannot be met after the thickness of the second isolation belt 11 is adjusted to 1.8cm or 4cm.

Example 7

This example basically refers to the processing system and method of example 1 for continuous processing, with the following differences: the flow rate was 6t/h. After running for 24h, the results are shown in Table 1.

Example 8

This example basically refers to the processing system and method of example 1 for continuous processing, with the following differences: the distance H between the top of the partition 9 and the bottom of the first chamber 3a is 0cm. After running for 24h, the results are shown in Table 1. Has no aggregation effect.

Example 9

The present embodiment basically refers to the processing system and method of embodiment 1 to perform continuous processing, and the difference is that: the distance H between the top of the partition 9 and the bottom of the first chamber 3a is 15cm. After running for 24 hours, the test results are shown in Table 1.

Example 10

The present embodiment basically refers to the processing system and method of embodiment 1 to perform continuous processing, and the difference is that: the thickness of the second separator tape 11 was 0.3cm. After running for 24 hours, the test results are shown in Table 1. Aggregation cannot be achieved.

Example 11

The present embodiment basically refers to the processing system and method of embodiment 1 to perform continuous processing, and the difference is that: the thickness of the second isolation belt 11 is 5cm. After running for 24 hours, the test results are shown in Table 1. Too much resistance results in the p-dichlorobenzene being discharged through the first isolation belt 10 to the second chamber 3b.

Table 1 shows the process conditions and the results of the measurements for examples 1 to 11

Reference to the literature

[1] Zhongpetrochemical Shanghai engineering Co., ltd. (fifth edition of chemical engineering design Manual [ M ]. Chemical industry Press, 2018.7)

[2] Yao \29495Yuan, yu Li Xin, chemical industry principle [ M ]. Qinghua university Press 2010.8

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A processing system for treating p-dichlorobenzene-containing wastewater, which is characterized in that: the treatment system comprises a separation device for separating p-dichlorobenzene-containing wastewater to obtain p-dichlorobenzene;

the separation chamber is positioned on one side of the phase separation chamber, a first isolation belt and a second isolation belt are arranged in the separation chamber, the first isolation belt is used for blocking paradichlorobenzene and allowing water to pass through, and the second isolation belt is used for blocking water and allowing paradichlorobenzene to pass through; the first isolation belt and the second isolation belt divide the inner space of the separation chamber into a first chamber, a second chamber and a third chamber, wherein the first chamber is communicated with the side part of the phase separation chamber, the first isolation belt and the second isolation belt respectively form the side wall of the first chamber, the second chamber is surrounded by the first isolation belt and the shell, and the second chamber is provided with a water outlet; the third chamber is enclosed by the second isolation belt and the shell together, or enclosed by the first isolation belt, the second isolation belt and the shell together, and the third chamber is provided with a p-dichlorobenzene outlet.

2. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 1, wherein: the first chamber is communicated with the upper side part of the phase separation chamber; and/or the p-dichlorobenzene outlet of the phase separation chamber is positioned at the bottom of the phase separation chamber.

3. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 2, wherein: a partition plate is arranged between the phase separation chamber and the first chamber, the partition plate forms a common side wall of the phase separation chamber and the first chamber, the upper end part of the partition plate is separated from the top wall of the shell to form a channel for communicating the phase separation chamber and the first chamber, and the distance H from the upper end part of the partition plate to the bottom of the first chamber is more than or equal to 20cm; and/or the presence of a gas in the gas,

the p-dichlorobenzene-containing wastewater enters the phase-splitting chamber from the wastewater inlet and stands in the phase-splitting chamber for layering, wherein the upper layer is a water phase, the lower layer is a p-dichlorobenzene phase, and the interface between the upper water phase and the lower p-dichlorobenzene phase is lower than the upper end part of the partition plate.

4. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 1, wherein: the third chamber is located directly below the first chamber or the third chamber is located directly below both the first and second chambers.

5. The treatment system for treating p-dichlorobenzene-containing wastewater according to claim 1 or 4, wherein: the first isolation belt comprises an upright part extending along the vertical direction and a horizontal part extending along the horizontal direction, the second isolation belt extends along the horizontal direction, and the horizontal part of the first isolation belt and the second isolation belt form a top wall of the third chamber.

6. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 5, wherein: the thickness of the vertical part of the first isolation belt is 0.3-0.6 cm, and the thickness of the horizontal part of the first isolation belt is 0.5-1cm; and/or the thickness of the second isolation belt is 0.5-4 cm.

7. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 1, wherein: the first isolation belt is made of hydrophilic filtering materials, and the second isolation belt is made of hydrophobic filtering materials.

8. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 7, wherein: the hydrophilic filtering material is hydrogel, silica gel, activated alumina, zeolite, activated carbon, fabric or sponge; and/or the second isolation zone is a super-hydrophobic filter membrane.

9. The treatment system for treating wastewater containing p-dichlorobenzene according to any one of claims 1 to 4 and 7 to 8, wherein the treatment system comprises: the separation equipment also comprises an adsorption chamber communicated with the water outlet through the second chamber, and adsorption materials are arranged in the adsorption chamber.

10. The treatment system for treating wastewater containing p-dichlorobenzene according to any one of claims 1 to 4 and 7 to 8, wherein: the separation equipment also comprises a heating jacket coated on the periphery of the shell, so that the temperature of materials in the shell is over 57 ℃.

11. The treatment system for treating wastewater containing p-dichlorobenzene according to claim 3, wherein: the separation device also comprises a liquid level meter for monitoring the height of an interface between the upper aqueous phase and the lower p-dichlorobenzene phase in the phase separation chamber.

12. The treatment system for treating wastewater containing p-dichlorobenzene according to any one of claims 1 to 4 and 7 to 8, wherein: the splitter still including connect on the casing and be used for supplying the inlet pipe of containing the dichlorobenzene waste water feeding, the export of the lower tip of inlet pipe is regarded as waste water entry, the lower tip of inlet pipe is located it is indoor to separate the phase, just the filter is connected to the lower tip of inlet pipe, gets rid of impurity.

13. The treatment system for treating wastewater containing p-dichlorobenzene according to any one of claims 1 to 4 and 7 to 8, wherein: the treatment system further comprises a water separator and a paradichlorobenzene collecting tank, the water separator is provided with a water outlet and a paradichlorobenzene outlet, the water outlet of the water separator is communicated with the wastewater inlet of the separating equipment, and the paradichlorobenzene outlet of the water separator and the paradichlorobenzene outlet of the separating equipment are respectively communicated with the paradichlorobenzene collecting tank.