Glyphosate waste liquid treatment device

Abstract

The utility model provides a glyphosate waste liquid treatment device which comprises a feeding system used for mixing glyphosate waste liquid; a feeding port of the evaporative crystallization system is connected with a discharging port of the feeding system, the evaporative crystallization system is used for concentrating the glyphosate waste liquid, evaporation mother liquor and a first crystal substance are obtained, and the first crystal substance contains sodium chloride; a feed port of the precipitation tank is connected with a discharge port of the evaporative crystallization system, the precipitation tank is used for obtaining a second crystal substance and a first mother solution, and the second crystal substance contains glyphosate; and a discharge port of the precipitation tank is connected with a feed port of the feed system and is used for enabling the first mother liquor to flow back to the feed system for circulating evaporation. When the glyphosate waste liquid treatment device is used for treating the glyphosate waste liquid, the glyphosate in the glyphosate waste liquid can be effectively recycled, and the economic benefit of waste water treatment is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a glyphosate waste liquid treatment device. Background Art

[0002] The glyphosate production process produces glyphosate waste liquid, which contains about 1.5% of organic phosphorus such as glyphosate, glyphosate and its metabolites, about 15% of sodium chloride, and a chemical oxygen demand (COD) greater than 2.0×10 4 mg / L, which has the characteristics of complex components, difficult degradation and difficult treatment, and direct discharge causes serious environmental pollution. Therefore, the effective recovery of valuable phosphine in glyphosate waste liquid can not only avoid environmental pollution, but also bring huge economic benefits.

[0003] The main methods for treating glyphosate waste liquid include incineration and advanced oxidation, physical adsorption, biodegradation, chemical precipitation and membrane separation. Incineration and advanced oxidation technologies have low selectivity for treating glyphosate waste liquid, which will destroy glyphosate and other valuable products and are not conducive to the resource utilization of glyphosate waste liquid, but are suitable for the treatment process of evaporating glyphosate mother liquor; biodegradation is difficult to carry out due to the high salt content of the waste liquid; adsorption methods generally have the problem of small adsorption capacity of adsorbents; chemical precipitation methods are suitable for the pretreatment stage of high-salt and total phosphorus COD waste liquid environments. Compared with other methods, it has higher treatment efficiency and better treatment effects. Its disadvantages are large amounts of chemical reagents, high costs, and the production of a large amount of sludge with complex components that requires secondary treatment; nanofiltration membrane separation methods can use combined membrane separation methods to remove impurities and concentrate waste liquids according to particle and molecular size, which can effectively recover valuable products and intercept harmful substances, but due to the complex composition of the waste liquid, the use of membrane technology alone to treat glyphosate waste liquid cannot fully meet the treatment indicators. Summary of the invention

[0004] The purpose of the utility model is to provide a device for implementing a method for treating glyphosate waste liquid, so as to solve the above-mentioned technical problems existing in the prior art.

[0005] The utility model of the glyphosate waste liquid treatment device comprises:

[0006] A feeding system for mixing glyphosate waste liquid;

[0007] An evaporation crystallization system, wherein the feed port of the evaporation crystallization system is connected to the discharge port of the feed system, and is used to concentrate the glyphosate waste liquid to obtain an evaporation mother liquor and a first crystal, wherein the first crystal contains sodium chloride;

[0008] A precipitation tank, wherein the feed port of the precipitation tank is connected to the discharge port of the evaporation crystallization system, and is used for introducing the evaporation mother liquor and precipitating glyphosate from the evaporation mother liquor to obtain a second crystallized product and a first mother liquor, wherein the second crystallized product contains glyphosate; and the discharge port of the precipitation tank is connected to the feed port of the feed system, and is used for refluxing the first mother liquor to the feed system for cyclic evaporation crystallization.

[0009] By adopting the device of the utility model to treat glyphosate waste liquid, the glyphosate therein can be effectively recycled and utilized, thereby increasing the economic benefits of wastewater treatment.

[0010] Preferably, the above device also includes a salt washing system and a drying system;

[0011] The feed port of the salt washing system is connected to another discharge port of the evaporation crystallization system to wash the first crystal to obtain the third crystal;

[0012] The feed inlet of the drying system is connected to the discharge outlet of the salt washing system, and is used to dry the third crystals discharged from the salt washing system. The dried third crystals meet the technical indicators specified in HG / T 5531.1-2019 Glyphosate By-product Industrial Salt Part 1: Sodium Chloride.

[0013] The use of the device of the utility model to treat glyphosate waste liquid can further recover sodium chloride in the waste water, and the sodium chloride can be used in the glyphosate production process, further increasing the economic benefits of waste water treatment.

[0014] Preferably, the above-mentioned device also includes a salt dissolving system and a purification system connected in sequence; the feed port of the salt dissolving system is connected to another discharge port of the salt washing system for dissolving the third crystal to obtain brine; the purification system is used to separate sodium chloride from the brine.

[0015] Preferably, the purification system is a material membrane, such as a nanofiltration membrane.

[0016] Preferably, the above-mentioned device also includes a deep processing system, and the feed port of the deep processing system is connected to the discharge port of the purification system to obtain refined brine, and the refined brine meets the quality indicators of brine inlet for chlor-alkali ion membrane electrolysis in GB / T 30297-2013.

[0017] By adopting the device of the utility model, the sodium chloride produced in the device can be further refined, and the obtained refined brine can be used in the chlor-alkali industry, providing multiple possibilities for resource utilization.

[0018] Preferably, the above-mentioned deep treatment system is an ozone oxidation system or a wet oxidation system.

[0019] Preferably, the above-mentioned device also includes a mixed salt system, and the feed port of the mixed salt system is connected to a discharge port of the evaporation crystallization system, which is used to remove impurities in the glyphosate waste liquid to obtain mixed salts.

[0020] Preferably, the feeding system is provided with a pH measuring unit for real-time measurement of the pH of the glyphosate waste liquid.

[0021] Preferably, a pH measuring unit is provided in the precipitation tank for measuring the pH of the evaporation mother liquor in real time.

[0022] Preferably, the evaporation crystallization system is provided with a temperature measuring unit for measuring the temperature of the evaporation crystallization in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure shows a connection diagram of the glyphosate waste liquid treatment device of the utility model.

[0024] Reference numerals:

[0025] 1-Feeding system, 2-Evaporation and crystallization system, 3-Precipitation tank, 4-Salt washing system, 5-Salt dissolving system, 6-Purification system, 7-Deep processing system. DETAILED DESCRIPTION

[0026] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0027] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0028] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0029] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0030] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] According to one embodiment of the present invention, referring to Figure 1 When the glyphosate waste liquid treatment device of this embodiment is used to treat glyphosate waste liquid, the glyphosate waste liquid and sodium hydroxide first enter the feed system 1, and the pH is adjusted in the feed system 1 to ensure that the pH of the glyphosate waste liquid is between 8 and 10. Then it enters the evaporation crystallization system 2, which is an MVR evaporation crystallizer in this embodiment to reduce energy consumption. The glyphosate waste liquid is concentrated in the evaporation crystallization system 2 to obtain an evaporation mother liquor and a first crystal containing sodium chloride.

[0032] The evaporated mother liquor then enters a precipitation tank, concentrated hydrochloric acid is added to the precipitation tank, a second crystal containing glyphosate is precipitated, and the first mother liquor is obtained in the precipitation tank after the second crystal is separated. The discharge port of the precipitation tank is connected to the feed port of the feed system, and is used to reflux the first mother liquor to the feed system for cyclic evaporation and crystallization. The glyphosate solid precipitated in the device of this embodiment can be directly used as a product.

[0033] According to another embodiment of the present invention, continue to refer to Figure 1 The above device also includes a salt washing system 4 and a drying system (not shown) connected in sequence. The feed port of the salt washing system 4 is connected to another discharge port of the evaporation crystallization system 2. The first crystals are washed with a saturated sodium chloride solution at room temperature in the salt washing system 4 to obtain third crystals. The feed port of the drying system is connected to the discharge port of the salt washing system 4, and is used to dry the third crystals discharged from the salt washing system 4. The dried third crystals meet the technical indicators specified in HG / T 5531.1-2019 Glyphosate Byproduct Industrial Salt Part 1: Sodium Chloride, and can be used in the process of producing glyphosate.

[0034] According to another embodiment of the present invention, continue to refer to Figure 1The glyphosate waste liquid device further includes a salt dissolving system 5 and a purification system 6 connected in sequence; the feed port of the salt dissolving system 5 is connected to another discharge port of the salt washing system 4, and the third crystal is dissolved in the salt dissolving system 5 to obtain brine, and the brine enters the purification system 6. The purification system 6 is a material membrane. In other embodiments of the utility model, the material membrane can be, for example, a nanofiltration membrane, which is used to separate sodium chloride from the brine. Specifically, the brine is separated by the material membrane to obtain a material concentrated water containing macromolecular organic matter and a small amount of other salts and a material produced water mainly containing sodium chloride and a small amount of small molecular organic matter.

[0035] Then the material produced water enters the deep treatment system 7 for oxidation to obtain refined brine. In this embodiment, the deep treatment system 7 is an ozone oxidation system. Of course, in other embodiments of the utility model, the deep treatment system can also be a wet oxidation system, as long as the organic matter in the material produced water can be effectively removed. The refined brine obtained in the deep treatment system 7 meets the quality index of the brine entering the chlor-alkali ion membrane electrolysis tank in GB / T 30297-2013.

[0036] By treating glyphosate waste liquid with the device of the utility model, not only the glyphosate therein can be recycled, but also sodium chloride products can be further obtained for glyphosate production, and refined brine can be obtained for the chlor-alkali industry, which has great economic benefits.

[0037] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. Glyphosate waste liquid treatment device, It is characterized in that include: A feeding system for mixing the glyphosate waste liquid; An evaporation crystallization system, wherein a feed port of the evaporation crystallization system is connected to a discharge port of the feed system, and is used to concentrate the glyphosate waste liquid to obtain an evaporation mother liquor and a first crystal, wherein the first crystal contains sodium chloride; A precipitation tank, wherein the feed port of the precipitation tank is connected to the discharge port of the evaporation crystallization system, and is used to introduce evaporation mother liquor and precipitate glyphosate from the evaporation mother liquor to obtain a second crystal and a first mother liquor, wherein the second crystal contains glyphosate; and the discharge port of the precipitation tank is connected to the feed port of the feeding system, and is used to reflux the first mother liquor to the feeding system for circulating evaporation crystallization.

2. The device according to claim 1, It is characterized in that The device also includes a salt washing system and a drying system; The feed inlet of the salt washing system is connected to another discharge outlet of the evaporation crystallization system, so as to wash the first crystals to obtain third crystals; The feed port of the drying system is connected to the discharge port of the salt washing system, and is used to dry the third crystals discharged from the salt washing system. The dried third crystals meet the technical indicators specified in HG / T 5531.1-2019 Glyphosate By-product Industrial Salt Part 1: Sodium Chloride.

3. The device according to claim 2, It is characterized in that The device also includes a salt dissolving system and a purification system connected in sequence; the feed port of the salt dissolving system is connected to another discharge port of the salt washing system to dissolve the third crystal to obtain brine; the purification system is used to separate sodium chloride from the brine.

4. The device according to claim 3, It is characterized in that The purification system is a material membrane.

5. The device according to claim 3, It is characterized in that The device also includes a deep processing system, the feed port of the deep processing system is connected to the discharge port of the purification system, and is used to obtain refined brine, which meets the quality indicators of brine inlet for chlor-alkali ion membrane electrolysis in GB / T 30297-2013.

6. The device according to claim 5, It is characterized in that The deep treatment system is an ozone oxidation system or a wet oxidation system.

7. The device according to claim 1, It is characterized in that The device also includes a mixed salt system, the feed port of the mixed salt system is connected to a discharge port of the evaporation crystallization system, and is used to remove impurities in the glyphosate waste liquid to obtain mixed salts.

8. The device according to claim 1, It is characterized in that The device satisfies one or more of the following: The feeding system is provided with a pH measuring unit for real-time measurement of the pH of the glyphosate waste liquid; The precipitation tank is provided with a pH measuring unit for real-time measurement of the pH of the evaporated mother liquor; The evaporation crystallization system is provided with a temperature measuring unit for measuring the temperature of the evaporation crystallization in real time.

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