CN109701393B - Underground water colloid in-situ tangential flow ultrafiltration device - Google Patents
Underground water colloid in-situ tangential flow ultrafiltration device Download PDFInfo
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- CN109701393B CN109701393B CN201910000254.6A CN201910000254A CN109701393B CN 109701393 B CN109701393 B CN 109701393B CN 201910000254 A CN201910000254 A CN 201910000254A CN 109701393 B CN109701393 B CN 109701393B
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Abstract
The invention discloses an in-situ tangential flow ultrafiltration device for underground water colloid, which comprises an ultrafiltration unit, a pre-filtration unit, a sampling unit and a control unit, wherein the control unit uses inert gas as drive to drive the underground water colloid sample into the sampling unit, the control unit is mainly used for controlling the opening and closing time of a holding bottle by a program and setting N in the holding bottle according to the sampling depth2The device designs a 'bamboo simple' tangential flow ultrafiltration unit and assembles with the groundwater sampler, adopts inert gas pressure to drive a water sample to enter the tangential flow ultrafiltration unit and separate colloid therein, and colloid after in-situ separation is taken out to be used for laboratory analysis, thereby solving the problem that the colloid is easily influenced by the environment after groundwater is taken out and separated. The device can be widely applied to sampling and separating underground hydrocolloid, and provides a reliable technical approach for researching the migration influence of colloid on underground pollutants in the field of environmental safety.
Description
Technical Field
The utility model relates to a belong to environment and geotechnical engineering field, specifically a groundwater colloid normal position tangential flow ultrafiltration device.
Background
Underground hydrocolloids are a general term for various suspended solid particles in underground water, and generally refer to suspended particles with a size of 1 nm to 1000 nm. The underground hydrocolloid can perform adsorption and carrying effects on heavy metal elements and radioactive pollution nuclides in water, so that pollutants flow in an underground water medium along with colloid particles, and an important influence is generated on the migration of the pollutants in the underground water. In order to research the influence of underground hydrocolloids on the migration of pollutants, accurate characterization of colloids in water is needed, including colloid content, composition, particle size distribution and the like, and the primary task of characterization is to enrich and separate trace colloids in water. The tangential flow ultrafiltration separation technology is generally adopted in the colloid enrichment separation of the surface water sample, and compared with the traditional pressure filtration separation technology, the tangential flow ultrafiltration separation technology can basically avoid the problem of filter membrane blockage, thereby increasing the filtration efficiency and improving the separation quality. However, when the groundwater is sampled to the surface and the colloid is separated by the tangential flow ultrafiltration device, the composition characteristics of the colloid are changed due to changes in environmental pressure and atmosphere, and the recognition of the colloid characteristics of the groundwater is further affected. The idea for solving the problem is to design a tangential flow ultrafiltration device capable of separating underground hydrocolloid in situ, so as to realize in situ separation of underground hydrocolloid, further provide reliable guarantee for accurate characterization of underground hydrocolloid, and have great academic value.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an underground water colloid normal position tangential flow ultrafiltration device to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an in-situ tangential flow ultrafiltration device for underground water colloid comprises an ultrafiltration unit, a pre-filtration unit, a sampling unit and a control unit, wherein the control unit is used for adjusting inert gas to drive so that an underground water colloid sample enters the sampling unit, the pre-filtration unit is used for removing large particles larger than 0.45 mu m in the underground water colloid sample, the control unit is arranged on the ground surface and is connected with a containing bottle for containing driving gas, the control unit is mainly used for controlling the opening and closing time and duration of the containing bottle by a program and setting the pressure of N2 in the containing bottle according to the sampling depth, the ultrafiltration unit is designed with a single tangential flow ultrafiltration unit on the basis of the traditional tangential flow ultrafiltration principle, an ultrafiltration membrane is arranged in the ultrafiltration unit, and the ' bamboo-simplified ' multi-tangential flow ultrafiltration unit is a ' S ' -shaped ' ultrafiltration unit formed by a plurality of single tangential flow ultrafiltration units in parallel, the ultrafiltrate outlet of the previous single tangential flow ultrafiltration unit is connected with the ultrafiltrate inlet of the next single tangential flow ultrafiltration unit, the trapped fluid outlet of the previous single tangential flow ultrafiltration unit is connected with the sample inlet of the next single tangential flow ultrafiltration unit, so as to form a flat multi-ultrafiltration unit, then the flat snake-shaped ultrafiltration unit is rolled into a bamboo slip shape, so as to form the bamboo slip type multi-tangential flow ultrafiltration unit, and finally the ultrafiltration unit is formed.
As a further aspect of the present invention: the sampling unit is used for acquiring an underground water and gel sample.
As a further aspect of the present invention: as a further aspect of the present invention: the driving gas is in particular high pressure N2.
As a further aspect of the present invention: the sampling unit adopts an N2 replacement type depth-fixing sampling design idea, and a sample tank is arranged in the sampling unit.
As a further aspect of the present invention: the opening and closing of the containing bottle are controlled by a surface control unit program.
As a further aspect of the present invention: the pre-filtering unit adopts a round flat-plate-shaped microporous filter membrane filter.
Compared with the prior art, the beneficial effects of the utility model are that: through adopting inert gas pressure drive water sample to get into tangential flow ultrafiltration unit and isolate colloid wherein, colloid after the normal position separation takes out can be used to laboratory analysis, the difficult problem of separating wherein colloid easily receives the environmental impact after groundwater takes out is solved, through using "bamboo slip formula" many tangential flow ultrafiltration unit, can be in limited volume space, prolong the ultrafiltration route as far as possible, in order to improve the separation efficiency of colloid, make solution flow through the distance that is as long as possible in the space as little as possible, increase the area of contact of solution and filter membrane, thereby improve ultrafiltration efficiency.
Drawings
FIG. 1 is the general structure of an in-situ tangential flow ultrafiltration system of an in-situ tangential flow ultrafiltration device for groundwater colloids.
FIG. 2 is a design diagram of a single tangential flow ultrafiltration unit in an in-situ tangential flow ultrafiltration device for groundwater colloids.
FIG. 3 is a plan view of a bamboo-simplified multi-tangential flow ultrafiltration unit in an underground hydrocolloid in-situ tangential flow ultrafiltration device.
FIG. 4 is a perspective view of a bamboo-simplified multi-tangential flow ultrafiltration unit in an in-situ tangential flow ultrafiltration device for groundwater colloids.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, in an embodiment of the present invention, an in-situ tangential flow ultrafiltration device for groundwater colloids includes an ultrafiltration unit 1, a pre-filtration unit 2, a sampling unit 3, and a control unit, wherein the control unit is configured to adjust an inert gas to drive the inert gas so that a groundwater colloid sample enters the sampling unit 3, the sampling unit 3 is configured to obtain the groundwater colloid sample, the pre-filtration unit 2 is configured to remove large particles larger than 0.45 μm from the groundwater colloid sample, the control unit is disposed on the ground surface and connected to a holding bottle for holding a driving gas, the driving gas is specifically high-pressure N2, the control unit is mainly configured to program control the opening and closing time and duration of the holding bottle, and set the pressure of N2 in the holding bottle according to a sampling depth, the sampling unit 3 adopts a N2 displacement type depth-fixed sampling design concept, the sampling unit 3 is internally provided with a sample tank, the opening and closing of the holding bottle are controlled by a surface control unit program, the pre-filtering unit 2 adopts a round flat-plate-shaped microporous filter membrane filter, the ultrafiltration unit 1 is designed with a single tangential flow ultrafiltration unit in the ultrafiltration unit 1 on the basis of the traditional tangential flow ultrafiltration principle, an ultrafiltration membrane is arranged in the ultrafiltration unit 1, the bamboo-simplified-type multi-tangential flow ultrafiltration unit is a snake-shaped ultrafiltration unit formed by a plurality of single tangential flow ultrafiltration units in parallel, an ultrafiltrate outlet of the previous single tangential flow ultrafiltration unit is connected with an ultrafiltrate inlet of the next single tangential flow ultrafiltration unit, a trapped fluid outlet of the previous single tangential flow ultrafiltration unit is connected with a sample inlet of the next single tangential flow ultrafiltration unit to form a flat-plate-shaped multi-ultrafiltration unit, and then the flat-plate-shaped snake-shaped ultrafiltration unit is rolled into a bamboo-simplified shape, forming a bamboo-simplified multi-tangential-flow ultrafiltration unit, finally forming an ultrafiltration unit 1, when the underground water colloid in-situ tangential-flow ultrafiltration device is used, filling N2 in a sample tank, emptying N2 after reaching a certain depth, automatically jacking a sample injection valve to fill the sample tank under water pressure, then filling N2 again, driving the sample to reach a pre-filtration unit 2, when the underground water colloid sample flows tangentially along the surface of the ultrafiltration membrane, allowing a small molecular solution with a molecular weight smaller than the molecular weight cut-off of the ultrafiltration membrane in the water sample to permeate the ultrafiltration membrane to be called ultrafiltrate, and gradually concentrating colloid particles along with the flow of fluid, wherein the part is called cut-off fluid, and because the underground in-situ ultrafiltration does not have the condition of circulating ultrafiltration, the sample needs to pass through the ultrafiltration unit 1 once, is directly sent to the ground in the form of the cut-off fluid and the ultrafiltrate, and by using the bamboo-simplified multi-tangential, can be in limited volume space, prolong ultrafiltration path as far as possible, in order to improve the separation efficiency of colloid, make solution flow through the distance that is more as long as possible in the space as little as possible, increase the area of contact of solution and filter membrane, thereby improve ultrafiltration efficiency, groundwater colloid gets into behind pre-filtering unit 2 and gets rid of the big granule that is greater than 0.45 mu m in water, get into ultrafiltration unit 1 along the tangential flow of unit inside filter membrane, realize that the normal position enrichment of colloid and after-separating will intercept liquid and ultrafiltrate carry the earth's surface, thereby can realize the normal position separation of underground hydrocolloid.
The utility model discloses a theory of operation is: when the underground water colloid in-situ tangential flow ultrafiltration device is used, when an underground water colloid sample tangentially flows along the surface of an ultrafiltration membrane, a part of small molecular solution with molecular weight smaller than the molecular weight cut off by the ultrafiltration membrane in the water sample permeates the ultrafiltration membrane to be called ultrafiltrate, and colloid particles are gradually concentrated along with the flow of fluid, the part is called cut-off liquid, because the underground in-situ ultrafiltration does not have the condition of circulating ultrafiltration, the sample needs to pass through an ultrafiltration unit 1 at one time and is directly sent to the ground in the form of the cut-off liquid and the ultrafiltrate, by using a bamboo-simplified multi-tangential flow ultrafiltration unit, the ultrafiltration path can be prolonged as far as possible in a limited volume space to improve the separation efficiency of colloid, so that the solution flows through a longer distance as possible in a space as small as possible, the contact area between the solution and the filtration membrane is increased, thereby the ultrafiltration efficiency is improved, after the underground water colloid enters a prefiltering unit, enters the ultrafiltration unit 1 and flows tangentially along the filter membrane in the unit to realize in-situ enrichment and separation of colloid, and then the trapped fluid and the ultrafiltrate are conveyed to the ground surface, thereby realizing in-situ separation of underground hydrocolloid.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides an in situ tangential flow ultrafiltration device of underground hydrocolloid, includes ultrafiltration unit (1), pre-filter unit (2), sampling unit (3) and the control unit, its characterized in that: the control unit is used for adjusting inert gas to drive so that an underground water colloidal sample enters the sampling unit (3), the pre-filtering unit (2) is used for removing large particles larger than 0.45 mu m in the underground water colloidal sample, the control unit is arranged on the ground surface and connected with a holding bottle for holding driving gas, the control unit is mainly used for program control of the opening and closing time and duration of the holding bottle and setting the pressure of N2 in the holding bottle according to the sampling depth, the ultrafiltration unit (1) is designed with a single tangential flow ultrafiltration unit in the ultrafiltration unit (1) on the basis of the traditional tangential flow ultrafiltration principle, an ultrafiltration membrane is arranged in the ultrafiltration unit (1), the 'bamboo-simplified' multi-tangential flow ultrafiltration unit is a 'snake' ultrafiltration unit formed by a plurality of single tangential flow ultrafiltration units in parallel, the ultrafiltrate outlet of the previous single tangential flow ultrafiltration unit is connected with the ultrafiltrate inlet of the next single tangential flow ultrafiltration unit, the trapped fluid outlet of the previous single tangential flow ultrafiltration unit is connected with the sample inlet of the next single tangential flow ultrafiltration unit to form a flat multi-ultrafiltration unit, then the flat snake-shaped ultrafiltration unit is rolled into a bamboo slip shape to form a bamboo slip type multi-tangential flow ultrafiltration unit, and finally the ultrafiltration unit (1) is formed.
2. An in-situ tangential flow ultrafiltration device of groundwater colloids as claimed in claim 1, wherein: the sampling unit (3) is used for acquiring an underground water and gel sample.
3. An in-situ tangential flow ultrafiltration device of groundwater colloids as claimed in claim 1, wherein: the driving gas is in particular high pressure N2.
4. An in-situ tangential flow ultrafiltration device of groundwater colloids as claimed in claim 1, wherein: the sampling unit (3) adopts an N2 replacement type depth-fixing sampling design idea, and a sample tank is arranged in the sampling unit (3).
5. An in-situ tangential flow ultrafiltration device of groundwater colloids as claimed in claim 1, wherein: the opening and closing of the containing bottle are controlled by a surface control unit program.
6. An in-situ tangential flow ultrafiltration device of groundwater colloids as claimed in claim 1, wherein: the pre-filtering unit (2) adopts a round flat-plate-shaped microporous filter membrane filter.
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| CN201910000254.6A CN109701393B (en) | 2019-01-01 | 2019-01-01 | Underground water colloid in-situ tangential flow ultrafiltration device |
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| CN110538506B (en) * | 2019-09-25 | 2023-10-13 | 浙江海洋大学 | Transparent soil pore liquid recovery device and recovery method |
| CN114307651A (en) * | 2021-11-23 | 2022-04-12 | 中国辐射防护研究院 | Device and method for separating adsorbed radionuclide colloids with different particle sizes |
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2019
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