Treatment system for chloridizing liquid refined washing wastewater

Abstract

The utility model belongs to the technical field of wastewater recovery and treatment, and particularly relates to a treatment system for chlorinated liquid refined washing wastewater. A trichloroethane washing wastewater pipeline is connected with a washing wastewater tank, the washing wastewater tank is connected with a first transmission pump, an outlet of the first transmission pump is divided into two pipelines, one pipeline is connected with an adsorption device, the other pipeline is connected with an inlet of the washing wastewater tank, an outlet of the adsorption device is divided into two pipelines, one pipeline is connected with an oil-water separation tank, and the other pipeline is connected with the inlet of the washing wastewater tank. An oil-phase pipeline and a water-phase pipeline are arranged at the bottom of the oil-water separation tank, the oil-phase pipeline is connected with a washing finished product tank, the water-phase pipeline is connected with a mixing tank, the mixing tank is connected with a sodium hydroxide solution pipeline, the mixing tank is connected with a cooler, the cooler is divided into two paths, one path is connected with the upper part of an absorption tower, and the other path is connected with a sodium hypochlorite finished product tank; the absorption tower bottom is connected with a mixing tank. Through the circulating design of the absorption tower and the mixing tank, the reaction is ensured to be fully carried out, and the yield and the concentration of sodium hypochlorite are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater recovery treatment technical field, and specifically relates to the treatment system of chlorinated liquid refining water washing wastewater. BACKGROUND

[0002] In chemical production, after 1,1,2-trichloroethane reacts with sodium hydroxide, wastewater containing sodium hypochlorite and sodium hydroxide is generated. This wastewater is usually reddish-brown turbidity, containing about 7% available chlorine and 1% free alkali. After long-term storage, the wastewater will stratify and produce brown flocculent precipitate. The traditional treatment method usually uses single precipitation or filtration process, which is difficult to effectively separate the organic phase and inorganic phase in the wastewater, and the treated wastewater usually enters the wastewater treatment system for treatment and reaches the standard for discharge, causing waste of resources and high cost of wastewater treatment, greatly increasing the production cost. SUMMARY

[0003] The utility model discloses to solve the problem that the treatment effect of chlorinated liquid refining water washing wastewater is poor, and the treated wastewater cannot be recycled, and provides a treatment system for chlorinated liquid refining water washing wastewater.

[0004] To solve the above problems, the technical scheme of the utility model is:

[0005] The treatment system for chlorinated liquid refining water washing wastewater, comprising a water washing trichloroethane wastewater pipeline, the water washing trichloroethane wastewater pipeline is connected with a water washing wastewater tank, the water washing wastewater tank is connected with the inlet of a first transmission pump through a pipeline, the outlet of the first transmission pump is divided into two pipelines, one is connected with an adsorption device, and the other is connected with the inlet of the water washing wastewater tank, the outlet of the adsorption device is divided into two pipelines, one is connected with an oil-water separation tank through an oil-water separation transportation pipeline, and the other is connected with the inlet of the water washing wastewater tank through a first circulation pipeline, the oil-water separation tank is provided with an oil phase pipeline and a water phase pipeline at the bottom, the oil phase pipeline is connected with a water washing product tank, the water phase pipeline is connected with a mixing tank, the mixing tank is connected with a sodium hydroxide solution pipeline, the mixing tank is connected with the inlet of a cooler, the outlet of the cooler is divided into two pipelines, one is connected with the upper part of an absorption tower through an absorption transportation pipeline, and the other is connected with a sodium hypochlorite product tank, the lower part of the absorption tower is connected with a chlorine gas pipeline, and the bottom of the absorption tower is connected with the mixing tank through a pipeline.

[0006] In the prior art, the absorption tower is usually operated in one direction, and the reaction is not sufficient. The utility model ensures that the reaction is fully carried out through the circulation design of the absorption tower and the mixing tank, and improves the yield and concentration of sodium hypochlorite.

[0007] Further, the adsorption device comprises first and second adsorption devices arranged side by side.

[0008] When one adsorption device is saturated, another adsorption device is switched to adsorb, ensuring the continuity of production, and the saturated adsorption device is regenerated.

[0009] Further, the oil-water separation tank top is connected with a water washing product tank through a gas phase balance pipeline.

[0010] The water washing product tank is connected through the gas phase balance pipeline, the system pressure is balanced, gas escape is prevented, the design of the oil-water separation tank combines the gas phase balance pipeline, and the separation efficiency and safety are improved.

[0011] After the oil phase is recovered, the water phase can be used as a product, and the water phase can be used for subsequent treatment, so that resources are utilized.

[0012] Further, the bottom of the sodium hypochlorite product tank is connected with a fourth transmission pump, the outlet of the fourth transmission pump is divided into two pipelines, one pipeline is connected with a packaging mechanism through a packaging transportation pipeline, and the other pipeline is connected with the outlet of the cooler through a second circulation pipeline.

[0013] The sodium hypochlorite solution product to be packaged is subjected to quality detection, and if the concentration is up to standard, the sodium hypochlorite solution product is transported to the packaging mechanism for packaging and selling, and if the concentration is not up to standard, the sodium hypochlorite solution product is transported to the absorption tower for further circulation until the sodium hypochlorite solution product is qualified.

[0014] In the prior art, the product quality is usually controlled through a single outlet, and it is difficult to dynamically adjust. The utility model realizes dynamic adjustment and quality control of the product through the circulation design of the product tank and the outlet of the cooler.

[0015] Further, the top of the absorption tower is connected with an alkali washing tower through a pipeline.

[0016] Unreacted chlorine is transported to the alkali washing tower for absorption, tail gas is further purified, and environmental pollution is reduced.

[0017] Further, the mixing tank is connected with the inlet of the cooler through a second transmission pump and a third transmission pump arranged in parallel.

[0018] The standby pump can effectively improve the continuity of production, and when one transmission pump fails, another transmission pump can be started in an emergency to continue the production process.

[0019] The working process of the treatment system for chlorination liquid refining and water washing wastewater is as follows:

[0020] The water-washing trichloroethane wastewater is transported to the water-washing wastewater tank through a water-washing trichloroethane wastewater pipeline, and after preliminary sedimentation in the water-washing wastewater tank, the wastewater enters the pump body through the inlet of the first transmission pump, and the outlet of the first transmission pump is divided into two pipelines: one is connected with the adsorption device (including the first adsorption device and the second adsorption device), and the other is connected with the inlet of the water-washing wastewater tank to form a circulation, and part of the wastewater is returned to the water-washing wastewater tank through the circulation to adjust the flow and pressure of the wastewater and ensure the processing efficiency of the adsorption device.

[0021] The wastewater enters the adsorption device (the first adsorption device or the second adsorption device) for adsorption treatment to remove impurities.

[0022] The wastewater after the adsorption treatment enters the oil-water separation tank through an oil-water separation transportation pipeline, and in the oil-water separation tank, the wastewater is separated into an oil phase and a water phase.

[0023] The water phase enters the mixing tank and is mixed with sodium hydroxide solution added through a sodium hydroxide solution pipeline, and the mixed liquid is transported to the cooler through the second transmission pump or the third transmission pump for cooling.

[0024] The liquid after cooling is divided into two paths from the outlet of the cooler: one path enters the upper part of the absorption tower through an absorption transportation pipeline, and the other path is connected to the sodium hypochlorite product tank.

[0025] The unreacted chlorine gas at the top of the absorption tower is connected to the caustic washing tower through a pipeline to further purify the tail gas and reduce environmental pollution.

[0026] The beneficial effects of the utility model are as follows:

[0027] (1) The parallel adsorption device of the utility model compared with the traditional single adsorption device realizes seamless switching of adsorption and regeneration, improves the continuity and economy of the system.

[0028] (2) The circulation design of the product tank and the cooler outlet realizes dynamic adjustment and quality control of the product.

[0029] (3) In the prior art, the absorption tower is usually operated in a unidirectional manner, resulting in insufficient reaction. This invention, through the circulation design of the absorption tower and the mixing tank, ensures that the reaction proceeds fully, thereby improving the yield and concentration of sodium hypochlorite. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the chlorination liquid refining water washing wastewater treatment system of this utility model;

[0032] In the diagram: 1. Trichloroethane washing wastewater pipeline; 2. Washing wastewater tank; 3. First transfer pump; 4. First adsorption device; 5. Second adsorption device; 6. First circulation pipeline; 7. Oil-water separation and transportation pipeline; 8. Oil-water separation tank; 801. Oil phase pipeline; 802. Water phase pipeline; 803. Gas phase equilibrium pipeline; 9. Washing finished product tank; 10. Mixing tank; 11. Sodium hydroxide solution pipeline; 12. Second transfer pump; 13. Third transfer pump; 14. Cooler; 15. Absorption and transportation pipeline; 16. Absorption tower; 17. Chlorine pipeline; 18. Sodium hypochlorite finished product tank; 19. Fourth transfer pump; 20. Packaging and transportation pipeline; 21. Second circulation pipeline; 22. Alkali washing tower. Detailed Implementation

[0033] The present invention will be explained in detail below with reference to the embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, the treatment system for chlorinated liquid refining washing wastewater includes a trichloroethane washing wastewater pipeline 1, which is connected to a washing wastewater tank 2. The washing wastewater tank 2 is connected to the inlet of a first transfer pump 3 via a pipeline. The outlet of the first transfer pump 3 is split into two pipelines: one connected to an adsorption device, and the other connected to the inlet of the washing wastewater tank 2. The outlet of the adsorption device is also split into two pipelines: one connected to an oil-water separator tank 8 via an oil-water separation transport pipeline 7, and the other connected to the inlet of the washing wastewater tank 2 via a first circulation pipeline 6. The bottom of the oil-water separator 8 is equipped with an oil phase pipeline 801 and a water phase pipeline 802. The oil phase pipeline 801 is connected to the water washing finished product tank 9, and the water phase pipeline 802 is connected to the mixing tank 10. The mixing tank 10 is connected to the sodium hydroxide solution pipeline 11. The mixing tank 10 is connected to the inlet of the cooler 14. The outlet of the cooler 14 is divided into two pipelines. One pipeline is connected to the upper part of the absorption tower 16 through the absorption transport pipeline 15, and the other pipeline is connected to the sodium hypochlorite finished product tank 18. The lower part of the absorption tower 16 is connected to the chlorine gas pipeline 17, and the bottom of the absorption tower 16 is connected to the mixing tank 10 through a pipeline.

[0036] In the prior art, the absorption tower 16 is usually operated in one direction, and the reaction is insufficient. The utility model ensures that the reaction is fully carried out and improves the yield and concentration of sodium hypochlorite through the circulation design of the absorption tower 16 and the mixing tank 10.

[0037] It can be understood that the adsorption device comprises the first adsorption device 4 and the second adsorption device 5 arranged side by side.

[0038] When one adsorption device is saturated, the other adsorption device is switched to carry out adsorption, ensuring the continuity of production, and the saturated adsorption device is regenerated.

[0039] It can be understood that the oil-water separation tank 8 is connected to the water washing product tank 9 through a gas phase balance pipeline 803 at the top.

[0040] The oil-water separation tank 8 is connected to the water washing product tank 9 through the gas phase balance pipeline 803, which balances the system pressure and prevents gas from escaping. The design of the oil-water separation tank 8 combined with the gas phase balance pipeline 803 improves the separation efficiency and safety.

[0041] The oil phase recovered can be used as a finished product, and the water phase enters subsequent processing to realize resource utilization.

[0042] It can be understood that the bottom of the sodium hypochlorite product tank 18 is connected to the fourth transmission pump 19, and the outlet of the fourth transmission pump 19 is divided into two pipelines, one of which is connected to the packaging mechanism through a packaging and transportation pipeline 20, and the other is connected to the outlet of the cooler 14 through a second circulation pipeline 21.

[0043] The sodium hypochlorite solution product to be packaged is subjected to quality detection, and if the concentration meets the standard, it is transported to the packaging mechanism for packaging and sale. If the concentration does not meet the standard, it is transported to the absorption tower 16 for further circulation until it meets the standard.

[0044] In the prior art, the quality of the finished product is usually controlled through a single outlet, which is difficult to dynamically adjust. The utility model realizes dynamic adjustment and quality control of the finished product through the circulation design of the product tank and the outlet of the cooler 14.

[0045] It can be understood that the top of the absorption tower 16 is connected to the caustic washing tower 22 through a pipeline.

[0046] The unreacted chlorine gas is transported to the caustic washing tower 22 for absorption, further purifying the tail gas and reducing environmental pollution.

[0047] It can be understood that the mixing tank 10 is connected to the inlet of the cooler 14 through the parallelly arranged second transmission pump 12 and third transmission pump 13.

[0048] The setting of the standby pump can effectively improve the continuity of production, and when one transmission pump fails, another transmission pump can be started in emergency to continue the production process.

[0049] The working process of the treatment system for washing waste water of chlorinated liquid is as follows:

[0050] The washing waste water is transported to the washing waste water tank 2 through the washing waste water pipeline 1, and after preliminary sedimentation in the washing waste water tank 2, the waste water enters the pump body through the inlet of the first transmission pump 3; the outlet of the first transmission pump 3 is divided into two pipelines: one is connected with the adsorption device (including the first adsorption device 4 and the second adsorption device 5), and the other is connected with the inlet of the washing waste water tank 2, forming a circulation, and part of the waste water is returned to the washing waste water tank 2 to adjust the flow and pressure of the waste water, and ensure the processing efficiency of the adsorption device.

[0051] The waste water enters the adsorption device (the first adsorption device 4 or the second adsorption device 5) for adsorption treatment to remove impurities; when one adsorption device is saturated, the system automatically switches to the other adsorption device for adsorption, ensuring the continuity of production; and the saturated adsorption device is regenerated.

[0052] The waste water after adsorption treatment enters the oil-water separation tank 8 through the oil-water separation pipeline 7, and in the oil-water separation tank 8, the waste water is separated into oil phase and water phase; the oil phase is connected to the washing product tank 9 through the oil phase pipeline 801, and the water phase enters the mixing tank 10 through the water phase pipeline 802; the top of the oil-water separation tank 8 is connected to the washing product tank 9 through the gas phase balance pipeline 803 to balance the system pressure and prevent gas from escaping.

[0053] The water phase enters the mixing tank 10 and is mixed with sodium hydroxide solution added through the sodium hydroxide solution pipeline 11, and the mixed liquid is transported to the cooler 14 through the second transmission pump 12 or the third transmission pump 13 for cooling.

[0054] The cooled liquid is divided into two ways from the outlet of the cooler 14: one way enters the upper part of the absorption tower 16 through the absorption pipeline 15, and the other way is connected to the sodium hypochlorite product tank 18; in the absorption tower 16, the liquid reacts with chlorine gas entering through the chlorine pipeline 17 to generate sodium hypochlorite; the liquid at the bottom of the absorption tower 16 returns to the mixing tank 10 through the pipeline to form a circulation, ensuring that the reaction is fully carried out; the generated sodium hypochlorite solution enters the sodium hypochlorite product tank 18; the sodium hypochlorite solution product to be packaged is subjected to quality detection, and if the concentration meets the standard, it is transported to the packaging mechanism for packaging and sale; if the concentration does not meet the standard, it is transported to the absorption tower 16 through the second circulation pipeline 21 for further circulation until it meets the standard.

[0055] Unreacted chlorine gas at the top of absorption tower 16 is connected by piping to caustic wash tower 22 for further purification of the tail gas and reduction of environmental pollution.

[0056] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0057] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A treatment system for chlorinated liquor refining water wash effluent, characterised in that, The water washing trichloroethane wastewater pipeline (1) is connected with a water washing wastewater tank (2), the water washing wastewater tank (2) is connected with the inlet of a first transmission pump (3), the outlet of the first transmission pump (3) is connected with an adsorption device and a water washing wastewater tank (2) in two ways, the outlet of the adsorption device is connected with an oil-water separation tank (8) and the water washing wastewater tank (2) in two ways, the bottom of the oil-water separation tank (8) is provided with an oil phase pipeline (801) and a water phase pipeline (802), the oil phase pipeline (801) is connected with a water washing product tank (9), the water phase pipeline (802) is connected with a mixing tank (10), the mixing tank (10) is connected with a sodium hydroxide solution pipeline (11), the mixing tank (10) is connected with the inlet of a cooler (14), the outlet of the cooler (14) is connected with an absorption tower (16) and a sodium hypochlorite product tank (18) in two ways, the bottom of the absorption tower (16) is connected with a chlorine pipeline (17), and the bottom of the absorption tower (16) is connected with the mixing tank (10) through a pipeline.

2. The treatment system for chlorination liquid refining water wash wastewater according to claim 1, characterized by, The adsorption device comprises first and second adsorption devices (4 and 5) arranged side by side.

3. The treatment system for chlorination liquid refining water wash wastewater according to claim 1, characterized by, The top of the oil-water separation tank (8) is connected with the water washing product tank (9) through a gas phase balance pipeline (803).

4. The treatment system for chlorination liquid refining water wash wastewater according to claim 1, characterized by, The bottom of the sodium hypochlorite product tank (18) is connected with a fourth transmission pump (19), the outlet of the fourth transmission pump (19) is connected with a packaging mechanism and the cooler (14) in two ways.

5. The treatment system for chlorination liquid refining water wash wastewater according to claim 1, characterized by, The top of the absorption tower (16) is connected with an alkali washing tower (22) through a pipeline.

6. The treatment system for chlorination liquid refining water wash wastewater according to claim 1, characterized by, The mixing tank (10) is connected with the inlet of the cooler (14) through a second transmission pump (12) and a third transmission pump (13) arranged in parallel. The top of the absorption tower (16) is connected with an alkali washing tower (22) through a pipeline. The mixing tank (10) is connected with the inlet of the cooler (14) through a second transmission pump (12) and a third transmission pump (13) arranged in parallel.

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