Wastewater Low-temperature Distillation Treatment Equipment

Abstract

The present invention relates to a wastewater low-temperature distillation treatment device, which includes a waste liquid collection tank, an antifoaming agent tank, a distillation device, a distilled water collection tank, and a DTRO device. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation device, the distillation device is connected to the DTRO device through the distilled water collection tank, the distillation device includes a distillation tank and a heating coil, a first heat exchanger, a circulating water tank, a second heat exchanger, and a condenser located in the distillation tank. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation tank, the distillation tank is connected to the circulating water tank through a first pipeline of the first heat exchanger, the DTRO device includes a DTRO membrane, and the distilled water collection tank is connected to the DTRO membrane. The device of the present invention is simple and avoids environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a wastewater low-temperature distillation treatment device. Background Art

[0002] Water is the source of life, and the global water shortage problem is becoming increasingly serious. Saving water has always been advocated. As a major water user in the industrial production industry, it is more necessary to reduce industrial water emissions, improve the recycling rate of water, and avoid waste of industrial water. At the same time, the environmental pollution problem is also becoming increasingly serious. Raising environmental awareness and reducing pollutants, especially the emissions of industrial production pollutants, are one of the important reasons for environmental pollution. How to treat the emissions of industrial pollution sources has become an important measure to reduce environmental pollution.

[0003] The paper-making industry is an industry with serious pollution source emissions. A large amount of water is required in the paper-making process. Traditional paper mills discharge a large amount of polluted water sources, which will pollute both water quality and soil, and also produce a large amount of unpleasant odors. The wastewater discharged from paper mills contains paper fibers remaining in the wastewater during the paper-making process, resulting in the loss and waste of paper fibers; the wastewater from paper mills also contains paper-making additives, and most of the paper-making additives are non-volatile and will remain in the soil or sewage, and the emissions into the environment will cause pollution that cannot be eliminated for a long time. The paper-making industry is also an industry that consumes a large amount of heat energy. The wastewater from paper mills contains heat energy, and direct discharge also has the problem of heat energy waste. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of environmental pollution and energy waste in the prior art, and thus provide a wastewater low-temperature distillation treatment device that can avoid environmental pollution and energy waste.

[0005] To solve the above technical problem, a wastewater low-temperature distillation treatment device of the present invention includes a waste liquid collection tank, an antifoaming agent tank, a distillation device, a distilled water collection tank, and a DTRO device. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation device, and the distillation device is connected to the DTRO device through the distilled water collection tank. The distillation device includes a distillation tank and a heating coil, a first heat exchanger, a circulation water tank, a second heat exchanger, and a condenser located in the distillation tank. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation tank. The distillation tank is connected to the circulation water tank through a first pipeline of the first heat exchanger. The circulation water tank is connected to a first pipeline of the second heat exchanger. The first pipeline of the second heat exchanger is connected to the circulation water tank through a second pipeline of the first heat exchanger. The second pipeline of the second heat exchanger is connected to the heating coil. The DTRO device includes a DTRO membrane, and the distilled water collection tank is connected to the DTRO membrane.

[0006] In one embodiment of the present invention, the heating coil is connected to the second pipeline of the second heat exchanger through a condenser.

[0007] In one embodiment of the present invention, the first heat exchanger is connected to the circulation water tank through a Venturi tube.

[0008] In one embodiment of the present invention, the circulation water tank is connected to the second heat exchanger through a circulation water pump.

[0009] In one embodiment of the present invention, the second heat exchanger is connected to the heating coil through a heat pump.

[0010] In one embodiment of the present invention, the concentrated water return port of the DTRO device is connected to the waste liquid collection tank.

[0011] In one embodiment of the present invention, the DTRO device further includes a safety filter, and the distilled water collection tank is connected to the DTRO membrane through the safety filter.

[0012] In one embodiment of the present invention, the DTRO device further includes a medicine box. The first output end of the DTRO membrane is sequentially connected to a one-way valve and a permeate flow meter. The second output end of the DTRO membrane is connected to the medicine box, and the medicine box is connected to the safety filter.

[0013] In one embodiment of the present invention, the output ends of the distilled water collection tank and the medicine box are sequentially connected to the safety filter through a feeding water pump and a pressure sensor.

[0014] In one embodiment of the present invention, the DTRO membrane is connected to the medicine box through a proportional valve and a concentrated water flow meter.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art:

[0016] The wastewater low-temperature distillation treatment equipment described in the present invention includes a waste liquid collection tank, an antifoaming agent tank, a distillation device, a distilled water collection tank, and a DTRO device. The waste liquid collection tank contains waste liquid, and the antifoaming agent tank contains an antifoaming agent. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation device, so that the waste liquid and the antifoaming agent can be transported into the distillation device. The antifoaming agent can inhibit the boiling of the waste liquid. After the waste liquid undergoes low-temperature distillation, the distillation device is connected to the DTRO device through the distilled water collection tank. The waste liquid after low-temperature distillation forms water vapor, which then becomes distilled water after condensation and flows into the distilled water collection tank. The distilled water discharged from the distilled water collection tank can effectively degrade TDS and COD after being treated by the DTRO device, thus meeting the direct discharge standard. In the present invention, if the water quality of the high-concentration wastewater does not meet the standard after low-temperature distillation in terms of COD or Tds, it can reach the discharge standard after degradation by the DTRO device 50. The equipment is not only simple, but also avoids environmental pollution, has low cost, and is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments of the present invention in combination with the drawings, where

[0018] Figure 1 is a schematic diagram of the wastewater low-temperature distillation treatment equipment of the present invention;

[0019] Figure 2 is a schematic diagram of the distillation device of the present invention;

[0020] Figure 3 is a schematic diagram of the DTRO device of the present invention.

[0021] Explanation of the reference numerals in the drawings: 10 - waste liquid collection tank, 11 - first diaphragm pump, 12 - second diaphragm pump, 13 - concentrated liquid tank, 14 - waste liquid valve, 15 - clean water valve, 16 - concentrated water valve, 20 - antifoaming agent tank, 30 - distillation device, 31 - distillation tank, 32 - heating coil, 33 - first heat exchanger, 34 - circulation water tank, 35 - second heat exchanger, 36 - condenser, 37 - expansion valve, 38 - circulation water pump, 39 - heat pump, 40 - distilled water collection tank, 50 - DTRO device, 51 - DTRO membrane, 52 - safety filter, 53 - medicine tank, 531 - inlet valve, 532 - outlet valve, 54 - feeding pump, 55 - high-pressure pump, 56 - safety valve, 57 - check valve, 58 - permeate flow meter, 60 - qualified water tank, 61 - Venturi tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] As Figure 1 and Figure 2 and Figure 3As shown in the figure, this embodiment provides a wastewater low-temperature distillation treatment device, including a waste liquid collection tank 10, an antifoaming agent tank 20, a distillation device 30, a distilled water collection tank 40, and a DTRO device 50. The waste liquid collection tank 10 and the antifoaming agent tank 20 are respectively connected to the distillation device 30. The distillation device 30 is connected to the DTRO device 50 through the distilled water collection tank 40. The distillation device 30 includes a distillation tank 31 and a heating coil 32, a first heat exchanger 33, a circulation water tank 34, a second heat exchanger 35, and a condenser 36 located in the distillation tank 31. The waste liquid collection tank 10 and the antifoaming agent tank 20 are respectively connected to the distillation tank 31. The distillation tank 31 is connected to the circulation water tank 34 through a first pipeline of the first heat exchanger 33. The circulation water tank 34 is connected to a first pipeline of the second heat exchanger 35. The first pipeline of the second heat exchanger 35 is connected to the circulation water tank 34 through a second pipeline of the first heat exchanger 33. The second pipeline of the second heat exchanger 35 is connected to the heating coil 32. The DTRO device 50 includes a DTRO membrane 51. The distilled water collection tank 40 is connected to the DTRO membrane 51.

[0023] The wastewater low-temperature distillation treatment device of this embodiment includes a waste liquid collection tank 10, an antifoaming agent tank 20, a distillation device 30, a distilled water collection tank 40, and a DTRO device 50. The waste liquid collection tank 10 contains waste liquid, and the antifoaming agent tank 20 contains an antifoaming agent. The waste liquid collection tank 10 and the antifoaming agent tank 20 are respectively connected to the distillation device 30, so that the waste liquid and the antifoaming agent can be transported into the distillation device 30. The antifoaming agent can inhibit the boiling of the waste liquid. After the waste liquid undergoes low-temperature distillation, the distillation device 30 is connected to the DTRO device 50 through the distilled water collection tank 40. The waste liquid after low-temperature distillation forms water vapor, and then becomes distilled water after condensation and flows into the distilled water collection tank 40. The distilled water discharged from the distilled water collection tank 40 can effectively degrade TDS (Total Dissolved Solids) and COD (Chemical Oxygen Demand) after being treated by the DTRO device 50, so as to reach the direct discharge standard. In this invention, if the water quality of the high-concentration wastewater does not meet the standard after low-temperature distillation, it can reach the discharge standard by further degrading through the DTRO device 50. It not only has a simple device, but also avoids environmental pollution, has a low cost, and is conducive to popularization and use.

[0024] The working process of the wastewater low-temperature distillation treatment device is described below:

[0025] The waste liquid is sucked into the waste liquid collection tank 11 by the first diaphragm pump 11. When the liquid level in the tank reaches the high limit, the first diaphragm pump 11 is closed and the distillation device 30 is opened. The distillation device 30 sucks the waste liquid from the waste liquid collection tank 10 into the distillation device 30 and stops sucking the waste liquid when it reaches the set liquid level. Defoamer is sucked in proportion, and heating starts when the preset vacuum value is reached to form water vapor, which is condensed into distilled water and flows into the distillation device 30. The water quality is detected using a conductivity sensor. When distillation reaches the preset low liquid level, waste liquid and defoamer are sucked in again, and distillation is repeated several times. When the proportion reaches the preset standard, the concentrated liquid is discharged and transported to the concentrated liquid tank 13 by the second diaphragm pump 12. The distillation device 30 is subjected to backwashing, and then waste liquid and defoamer are continuously sucked in for distillation, and it keeps working within the set time. When the distilled water collection tank 40 reaches the upper liquid level, the DTRO device 50 is started to treat the distilled water. The concentrated water flows back into the waste liquid collection tank 10, and the qualified wastewater flows into the qualified water tank 60. The equipment automatically performs backwashing once when it stops.

[0026] As Figure 2 and Figure 3 shown below, the working principle of the distillation device 30 is described in detail:

[0027] The distillation device 30 includes a distillation tank 31 and a heating coil 32, a first heat exchanger 33, a circulation water tank 34, a second heat exchanger 35 and a condenser 36 located in the distillation tank 31. The waste liquid collection tank 10 and the defoamer tank 20 are respectively connected to the distillation tank 31, so that waste liquid and defoamer can be transported into the distillation tank 31 to form a mixture of distilled water, waste liquid and distillation gas. The distillation tank 31 is connected to the circulation water tank 34 through the first pipeline of the first heat exchanger 33, which is conducive to cooling the mixture of distilled water, waste liquid and distillation gas to form a mixture of distilled water and waste liquid. The circulation water tank 34 is connected to the first pipeline of the second heat exchanger 35, and the first pipeline of the second heat exchanger 35 is connected to the circulation water tank 34 through the second pipeline of the first heat exchanger 33, which is conducive to recovering energy and improving the energy utilization rate. The second pipeline of the second heat exchanger 35 is connected to the heating coil 32, which is conducive to heating the distilled water and waste liquid and effectively saves energy. The DTRO device 50 includes a DTRO membrane 51. The distilled water collection tank 40 is connected to the DTRO membrane 51. After the distilled water passes through the DTRO membrane 51, the TDS and COD can be effectively degraded, so as to reach the direct discharge standard.

[0028] In this embodiment, the waste liquid is sucked into the waste liquid collection tank 11 by the first diaphragm pump 11. In addition, it is also necessary to detect the pH values of the liquids in the waste liquid collection tank 10 and the distilled water collection tank 40 respectively. The concentrated liquid outlet of the distillation device 30 is connected to the concentrated liquid tank 13 through the second diaphragm pump 12.

[0029] The heating coil 32 is connected to the second pipeline of the second heat exchanger 35 through the condenser 36, which is conducive to recycling the distilled water discharged from the heating coil 32 and effectively saves energy. Specifically, the condenser 36 is connected to the second pipeline of the second heat exchanger 35 through the expansion valve 37, and the expansion valve 37 plays a role in throttling and pressure reduction and regulating the flow rate.

[0030] The first heat exchanger 33 is connected to the circulation water tank 34 through the venturi tube 61. A negative pressure can be formed in the distillation tank 31 through the venturi tube 61, so that the waste liquid in the waste liquid collection tank 10 can be sucked into the distillation device 30. After sucking the defoamer in proportion and reaching the preset vacuum value, heating is started, which is conducive to the formation of water vapor.

[0031] The circulation water tank 34 is connected to the second heat exchanger 35 through the circulation water pump 38, which is conducive to transporting the distilled water in the circulation water tank 34 into the second heat exchanger 35. In addition, the mixture of distilled water and waste liquid discharged from the circulation water tank 34 is heated by the second heat exchanger 35 and then flows back to the first heat exchanger 33. After cooling, it flows back into the circulation water tank 34 through the venturi tube 61.

[0032] The second heat exchanger 35 is connected to the heating coil 32 through the heat pump 39, which is conducive to transporting the mixture of distilled water and waste liquid flowing out of the second heat exchanger 35 into the heating coil 32. The cold end pipeline of the heat pump 39 cools the circulating water in the second heat exchanger 35. The hot end pipeline of the heat pump 39 passes through the heating coil 32 to heat the waste liquid, and the excess heat is discharged after being cooled by the condenser 36.

[0033] In addition, a waste liquid valve is provided between the waste liquid collection tank 10 and the distillation device 30, and the waste liquid enters the distillation tank 31 through the waste liquid valve. A defoamer valve is provided between the defoamer tank 20 and the distillation device 30, and the defoamer enters the distillation tank 31 through the defoamer valve.

[0034] The distilled water flowing out of the first heat exchanger 33 can also overflow from the circulation water tank 34 for easy reuse and can be used to clean the equipment after passing through the cleaning valve. The concentrated liquid formed in the distillation tank 31 is discharged through the concentrated liquid valve. The distillation tank 31 is also provided with a pressure relief pipeline, and the negative pressure in the distillation tank 31 is relieved through the pressure relief valve.

[0035] As Figure 3 shown, the working principle of the DTRO device 50 is described in detail below:

[0036] The concentrated water return port of the DTRO device 50 is connected to the waste liquid collection tank 10, which is conducive to collecting waste liquid.

[0037] The DTRO device further includes a safety filter 52. The distilled water collection tank 40 is connected to the DTRO membrane 51 through the safety filter 52, which is conducive to separating distilled water from waste liquid and avoiding polluting the environment with the discharged waste liquid.

[0038] The DTRO device 50 further includes a medicine box 53. The first output end of the DTRO membrane 51 is successively connected to a one-way valve 57 and a permeate flow meter 58, which can be used to clean the equipment; the second output end of the DTRO membrane 51 is connected to the medicine box 53, and the medicine box 53 is connected to the safety filter 52.

[0039] The output ends of the distilled water collection tank 40 and the medicine box 53 are successively connected to the safety filter 52 through a feed pump 54 and a pressure sensor, which is conducive to transporting the distilled water in the distilled water collection tank 40 and the medicine in the medicine box 53 into the safety filter 52 to effectively clean the equipment and ensure the effect of separating distilled water from waste liquid.

[0040] The DTRO membrane 51 is connected to the medicine box 53 through a proportional valve and a concentrated water flow meter. The proportional valve includes an electric proportional valve and a manual proportional valve.

[0041] During normal operation, the waste liquid passes through the waste liquid valve 14 and then through the feed pump 54, safety filter 52, high-pressure pump 55, safety valve 56, DTRO membrane 51, electric proportional valve, manual proportional valve, and flow meter, and the concentrated water is refluxed through the concentrated water valve. The flow of the electric proportional valve is automatically adjusted, and the qualified waste water flows out of the DTRO membrane 51 and is discharged through the one-way valve 57 and the permeate flow meter 58, fully meeting the discharge requirements.

[0042] When the equipment stops or malfunctions: when the preset shutdown time value is reached, the clean water valve 15 opens, and after cleaning the equipment, it is discharged through the concentrated water valve 16.

[0043] If the safety filter 52 is blocked: the first pressure sensor is greater than the preset value, replace the safety filter cotton core. If the DTRO membrane 51 is blocked: the second pressure sensor is greater than the preset value, the medicine box 53 is filled with cleaning agent, and the inlet valve 531 and the outlet valve 532 of the medicine box 53 are opened to use the medicine cleaning equipment. Protect the DTRO membrane 51: when the equipment is not used for a long time, the medicine box is filled with protective liquid (antifreeze is added when the temperature is below 0°C), and the inlet valve and the outlet valve are opened for circulation.

[0044] In this embodiment, the range of the low temperature is 28°-37°.

[0045] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A wastewater low-temperature distillation treatment device, characterized in that: It includes a waste liquid collection tank, an antifoaming agent tank, a distillation device, a distilled water collection tank, and a DTRO device. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation device. The distillation device is connected to the DTRO device through the distilled water collection tank. The distillation device includes a distillation tank, a heating coil located in the distillation tank, a first heat exchanger, a circulation water tank, a second heat exchanger, and a condenser. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation tank. The distillation tank is connected to the circulation water tank through a first pipeline of the first heat exchanger. The circulation water tank is connected to a first pipeline of the second heat exchanger. The first pipeline of the second heat exchanger is connected to the circulation water tank through a second pipeline of the first heat exchanger. The second pipeline of the second heat exchanger is connected to the heating coil. The DTRO device includes a DTRO membrane. The distilled water collection tank is connected to the DTRO membrane. The concentrated water return port of the DTRO device is connected to the waste liquid collection tank. The DTRO device further includes a safety filter. The distilled water collection tank is connected to the DTRO membrane through the safety filter. The DTRO device further includes a medicine tank. The first output end of the DTRO membrane is successively connected to a one-way valve and a permeate flow meter. The second output end of the DTRO membrane is connected to the medicine tank. The medicine tank is connected to the safety filter. The heating coil is connected to the second pipeline of the second heat exchanger through the condenser. The first pipeline and the second pipeline of the first heat exchanger are connected to the circulation water tank through a Venturi tube. The second pipeline of the second heat exchanger is connected to the heating coil through a heat pump. The low temperature range is 28°-37°. The waste liquid collection tank contains waste liquid, and the antifoaming agent tank contains an antifoaming agent. The waste liquid collection tank and the antifoaming agent tank are respectively connected to the distillation device, so as to transport the waste liquid and the antifoaming agent into the distillation device. The antifoaming agent inhibits the boiling of the waste liquid. After the waste liquid is distilled at low temperature, the distillation device is connected to the DTRO device through the distilled water collection tank. The waste liquid after low-temperature distillation forms water vapor, and then becomes distilled water after condensation and flows into the distilled water collection tank.

2. The wastewater low-temperature distillation treatment device according to claim 1, characterized in that: The circulation water tank is connected to the second heat exchanger through a circulation water pump.

3. The wastewater low-temperature distillation treatment device according to claim 1, characterized in that: The output ends of the distilled water collection tank and the medicine tank are successively connected to the safety filter through a feed water pump and a pressure sensor.

4. The wastewater low-temperature distillation treatment device according to claim 1, characterized in that: The DTRO membrane is successively connected to the medicine tank through a proportional valve and a concentrated water flow meter.

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