Organic waste liquid treatment device

Abstract

The utility model discloses an organic waste liquid treatment device, which comprises a first filter unit, an extraction unit, a rectification unit, a second filter unit and a biochemical unit, the first filter unit is connected with the biochemical unit and the extraction unit, the extraction unit is connected with the rectification unit and the second filter unit, and the second filter unit is connected with the second filter unit. The second filtering unit is also connected with the biochemical unit; the organic waste liquid treatment device further comprises a first channel, a second channel and a third channel, and produced water of the first channel and produced water of the second channel enter the biochemical unit. According to the organic waste liquid treatment device disclosed by the utility model, the treatment mode is layered and ordered, the operation stability of equipment is high, the impurity content in organic waste liquid can be reduced, the feeding quantity of rectification equipment is reduced, and the treatment energy consumption is favorably reduced; meanwhile, the treatment capacity is effectively improved, the residue yield in the rectification process is reduced, the loss caused by the solvent carried by the residues is reduced, and the operation efficiency of equipment is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic waste liquid treatment, and particularly relates to an organic waste liquid treatment device. Background Art

[0002] At present, the main treatment process for used organic waste liquid is to directly recover it by rectification, recycle the organic solvent, and incinerate the bottom liquid of the tower. This treatment method is relatively simple, but the amount of evaporated wastewater is large and the cost is high. It only filters visible insoluble impurities and cannot remove soluble impurities in advance. In addition, it has no treatment ability for impurities that may precipitate during the rectification process. Due to the presence of different types and concentrations of impurities in the waste solvent, residues or azeotropes will be generated during the rectification recovery process, which will cause blockage of the tower plates, resulting in poor heat transfer of the equipment and increasing its treatment energy consumption. Content of the Utility Model

[0003] In view of this, in order to overcome the defects of the prior art, the purpose of the utility model is to provide an organic waste liquid treatment device that can pre-treat the waste liquid, reduce equipment blockage, and lower treatment energy consumption.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An organic waste liquid treatment device includes a first filtration unit, an extraction unit, a rectification unit, a second filtration unit, and a biochemical unit. The first filtration unit is connected to both the biochemical unit and the extraction unit. The extraction unit is connected to both the rectification unit and the second filtration unit. The second filtration unit is also connected to the biochemical unit. The organic waste liquid treatment device also includes a first passage, a second passage, and a third passage. The produced water from the first passage and the second passage both enters the biochemical unit. The biochemical unit is used to decompose some residual organic matters in the produced water and finally turn them into carbon dioxide and water.

[0006] By setting up the first filtration unit to remove most of the water in the organic waste liquid, the amount of sewage entering the rectification unit is reduced, and the evaporation cost is lowered. Moreover, the first filtration unit can effectively intercept organic substances with a molecular weight above 100, greatly reducing the organic substance content in the produced water and meeting the influent standard of the biochemical unit. The produced water of the first filtration unit can be directly treated. The concentrated water after the first filtration unit contains a high concentration of DMAC and PVP. After material separation in the extraction unit, the extraction liquid enters the rectification unit for rectification separation, and high-purity DMAC recovery products can be obtained. The extractant can be recycled. The raffinate remaining after extraction contains PVP. The organic substance content in the produced water of the raffinate after passing through the second filtration unit for filtration treatment is greatly reduced and can be directly discharged into the biochemical unit. The PVP content in the concentrated water after the second filtration unit is high and can be directly treated as hazardous waste in the treatment unit.

[0007] According to some preferred embodiments of the present invention, the first path sequentially includes a first filtration unit and a biochemical unit. The first path is used to discharge the produced water obtained after passing the organic waste liquid through the first filtration unit into the biochemical unit. The flow direction of each unit in the first path is from the first filtration unit to the biochemical unit.

[0008] According to some preferred embodiments of the present invention, the second path sequentially includes a first filtration unit, an extraction unit, a second filtration unit, and a biochemical unit. The second path is used to extract the concentrated water obtained after passing the organic waste liquid through the first filtration unit, and discharge the produced water obtained from the raffinate after extraction through the second filtration unit into the biochemical unit. The flow direction of each unit in the second path is from the first filtration unit to the extraction unit, then from the extraction unit to the second filtration unit, and finally from the second filtration unit to the biochemical unit.

[0009] According to some preferred embodiments of the present invention, the third path sequentially includes a first filtration unit, an extraction unit, and a rectification unit. The third path is used to extract the concentrated water obtained after passing the organic waste liquid through the first filtration unit, and perform rectification separation on the extraction liquid obtained after extraction to obtain organic solvents. The flow direction of each unit in the third path is from the first filtration unit to the extraction unit, and then from the extraction unit to the rectification unit.

[0010] According to some preferred embodiments of the present invention, the first filtration unit includes a first filtration medium, the second filtration unit includes a second filtration medium, and the pore size of the first filtration medium is larger than the pore size of the second filtration medium.

[0011] According to some preferred embodiments of the present invention, the pore size of the first filtration medium is 1 - 50 nm, and the pore size of the second filtration medium is 1 - 2 nm.

[0012] According to some preferred embodiments of the present utility model, the first filtration medium is an organic polymer permeable membrane, a ceramic membrane or an alumina fiber membrane, and the second filtration medium is an organic polymer permeable membrane, a ceramic membrane or an alumina fiber membrane.

[0013] According to some preferred embodiments of the present utility model, a liquid outlet pipe is provided between the rectification unit and the extraction unit. One end of the liquid outlet pipe is communicated with the rectification unit, and the other end of the liquid outlet pipe is communicated with the extraction unit. The liquid outlet pipe is used for flowing back the extractant obtained after rectification separation in the rectification unit into the extraction unit.

[0014] According to some preferred embodiments of the present utility model, a recovery unit is further included. The recovery unit is connected to the rectification unit, and the recovery unit is used for collecting the organic solvent obtained after rectification separation by the rectification unit.

[0015] According to some preferred embodiments of the present utility model, a treatment unit is further included. The treatment unit is connected to the second filtration unit, and the treatment unit is used for treating the concentrated water generated after filtration by the second filtration unit. The concentrated water entering the treatment unit can be outsourced for treatment or directly incinerated.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: An organic waste liquid treatment device of the present utility model intercepts organic substances through the first filtration unit, recovers the organic solvent through the extraction unit and the rectification unit, and simultaneously filters the raffinate after extraction again. The treatment method of the entire recovery treatment device is hierarchical and orderly, the operation stability of the equipment is high, the impurity content in the organic waste liquid can be reduced, the feed amount of the rectification equipment can be reduced, which is beneficial to reducing the treatment energy consumption; at the same time, the treatment capacity is effectively improved, the residue yield in the rectification process is reduced, the loss caused by the residue carrying the solvent is reduced, and the operation efficiency of the equipment is effectively improved. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the principle of the organic waste liquid treatment device in the preferred embodiment of the present utility model. Detailed Embodiments

[0019] To enable those skilled in the art to better understand the technical solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Referring to Figure 1 , the organic waste liquid treatment device in this embodiment includes a feed water pump, a first filtration unit, an extraction unit, a rectification unit, a second filtration unit, a biochemical unit, a recovery unit, and a treatment unit. The first filtration unit is connected to both the biochemical unit and the extraction unit. The extraction unit is connected to both the rectification unit and the second filtration unit. The second filtration unit is also connected to the biochemical unit and the treatment unit. The rectification unit is also connected to the recovery unit.

[0021] The first filtration unit includes a first filtration medium, and the second filtration unit includes a second filtration medium. The first filtration medium is an organic polymer permeable membrane, a ceramic membrane, or an alumina fiber membrane. The second filtration medium is an organic polymer permeable membrane, a ceramic membrane, or an alumina fiber membrane. Among them, the pore size of the first filtration medium is 1-50 nm, and the pore size of the second filtration medium is 1-2 nm.

[0022] Furthermore, the organic waste liquid treatment device in this embodiment further includes a first passage, a second passage, and a third passage. The produced water of the first passage and the second passage both enters the biochemical unit. Specifically, the first passage sequentially includes the first filtration unit and the biochemical unit. The first filtration unit is in communication with the biochemical unit, and the produced water obtained after the organic waste liquid enters the first filtration unit by the feed water pump directly flows to the biochemical unit. The first filtration unit can effectively intercept organic substances with a molecular weight of 100 or more, so that the content of organic substances in the produced water obtained after passing through the first filtration unit is greatly reduced, meeting the inlet water standard of the biochemical unit.

[0023] The second passage sequentially includes the first filtration unit, the extraction unit, the second filtration unit, and the biochemical unit. The first filtration unit is in communication with the extraction unit, the extraction unit is in communication with the second filtration unit, the second filtration unit is in communication with the biochemical unit, and the second filtration unit is also in communication with the treatment unit. The concentrated water produced after the organic waste liquid is treated by the first filtration unit by the feed water pump enters the extraction unit for extraction and separation. The raffinate remaining after extraction enters the second filtration unit, and the produced water obtained after filtration by the second filtration unit is directly discharged into the biochemical unit; the concentrated water produced after filtration by the second filtration unit is directly used as hazardous waste and enters the treatment unit for centralized outsourcing treatment or direct incineration treatment.

[0024] The third passageway sequentially includes a first filtration unit, an extraction unit, and a rectification unit. The first filtration unit is communicated with the extraction unit, the extraction unit is communicated with the rectification unit, and the rectification unit is communicated with the recovery unit. In addition, a liquid outlet pipe (not shown) is provided between the rectification unit and the extraction unit. One end of the liquid outlet pipe is communicated with the rectification unit, and the other end of the liquid outlet pipe is communicated with the extraction unit. The organic waste liquid enters the first filtration unit by a feed water pump. The concentrated water generated after being treated by the first filtration unit enters the extraction unit for extraction separation. The extraction liquid obtained after extraction enters the rectification unit for rectification separation to respectively obtain an extractant and the pure organic solvent recovered from the organic waste liquid. Among them, the pure organic solvent recovered from the organic waste liquid enters the recovery unit for collection, and the extractant returns to the extraction unit again through the liquid outlet pipe, so that the extractant can be reused.

[0025] The working process of the organic waste liquid treatment device of this embodiment is described as follows:

[0026] The organic waste liquid enters the first filtration unit by a feed water pump. The produced water obtained after filtration enters the biochemical unit directly for degradation treatment. The concentrated water generated contains a high concentration of DMAC and PVP and then enters the extraction unit for extraction separation. The extraction liquid obtained after extraction enters the rectification unit for rectification separation. The high-purity DMAC obtained enters the recovery unit for collection directly, and the extractant obtained returns to the extraction unit again through the liquid outlet pipe to be reused. The raffinate remaining after extraction enters the second filtration unit for filtration treatment. The produced water obtained enters the biochemical unit directly. The PVP content in the concentrated water generated is relatively high and can be directly used as hazardous waste to enter the treatment unit for treatment.

[0027] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An organic waste liquid treatment device, characterized in that: It includes a first filtering unit, an extraction unit, a distillation unit, a second filtering unit and a biochemical unit, wherein the first filtering unit is connected to the biochemical unit and the extraction unit, the extraction unit is connected to the distillation unit and the second filtering unit, and the second filtering unit is also connected to the biochemical unit; the organic waste liquid treatment device also includes a first passage, a second passage and a third passage, and the produced water of the first passage and the second passage both enters the biochemical unit.

2. The organic waste liquid treatment device according to claim 1, characterized in that: The first passage includes a first filtering unit and a biochemical unit in sequence. The first passage is used to discharge produced water obtained after the organic waste liquid passes through the first filtering unit into the biochemical unit.

3. The organic waste liquid treatment device according to claim 1, characterized in that: The second passage includes a first filtering unit, an extraction unit, a second filtering unit and a biochemical unit in sequence. The second passage is used to extract the concentrated water obtained after the organic waste liquid passes through the first filtering unit, and discharge the produced water obtained by passing the raffinate obtained after the extraction through the second filtering unit into the biochemical unit.

4. The organic waste liquid treatment device according to claim 1, characterized in that: The third passage includes a first filtering unit, an extraction unit and a distillation unit in sequence. The third passage is used to extract the concentrated water obtained after the organic waste liquid passes through the first filtering unit, and to distill and separate the extracted liquid obtained after the extraction to obtain an organic solvent.

5. The organic waste liquid treatment device according to claim 1, characterized in that: The first filter unit includes a first filter medium, and the second filter unit includes a second filter medium. The pore size of the first filter medium is larger than that of the second filter medium.

6. The organic waste liquid treatment device according to claim 5, characterized in that: The pore size of the first filter medium is 1-50 nm, and the pore size of the second filter medium is 1-2 nm.

7. The organic waste liquid treatment device according to claim 5, characterized in that: The first filter medium is an organic polymer permeable membrane, a ceramic membrane or an aluminum oxide fiber membrane, and the second filter medium is an organic polymer permeable membrane, a ceramic membrane or an aluminum oxide fiber membrane.

8. The organic waste liquid treatment device according to claim 4, characterized in that: A liquid outlet pipe is provided between the distillation unit and the extraction unit, one end of the liquid outlet pipe is connected to the distillation unit, and the other end of the liquid outlet pipe is connected to the extraction unit. The liquid outlet pipe is used to flow the extractant obtained after entering the distillation unit for distillation and separation back to the extraction unit.

9. The organic waste liquid treatment device according to claim 4, characterized in that: It also includes a recovery unit, which is connected to the distillation unit and is used to collect the organic solvent obtained after distillation and separation by the distillation unit.

10. The organic waste liquid treatment device according to claim 3, characterized in that: It also includes a processing unit, which is connected to the second filtering unit and is used to process concentrated water generated after filtering by the second filtering unit.

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