Device and method for circularly separating soil microplastics based on sodium bromide solution
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of solution circulation and sodium bromide, which is applied in the field of separation, can solve the problems of difficult separation of high-density microplastics, long time consumption, and large consumption of reagents, and achieve the effects of reducing wall sticking, reducing procedures, and saving reagents
Pending Publication Date: 2019-06-14
EAST CHINA NORMAL UNIVERSITY
View PDF8 Cites 9 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
The invention aims to solve the problems of large reagent consumption, long time consumption and d
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0061] Taking the separation efficiency of PA, PP, PE, PET, POM, PVC, PC, ABS, PMMA and PS microplastics in soil as an example
[0062] Specific process:
[0063] ① Weigh 50g soil sample (this soil sample is a normal soil sample collected from the campus, without microplastic removal treatment, but the microplastics added in Examples 1-3 are microplastics that have been dyed).
[0064] ②Select 20 granular microplastics (such as PP) of the same type with a size of 1-3mm that have been marked by Nile Red dyeing, and mix them evenly into the soil sample.
[0065] ③ Prepare 200ml saturated sodium bromide solution.
[0066] ④ Pour 100ml of saturated sodium bromide solution into the 2-separator, turn on the aeration device, and then pour the mixed soil sample.
[0067] ⑤ 3-Aeration plate is connected to 11-adjustable aeration pump, aerate for 30 minutes, and then stand for 2 hours.
[0068] ⑥ Put the separator into the soil microplastic separation device, and place a filter membr...
Embodiment 2
[0079] Taking PE as an example, PE granular microplastics with particle sizes of 100-500 μm, 500-1000 μm, and 1000-3000 μm were selected to conduct experiments respectively. The specific process refers to Example 1. The recovery rate of PE microplastics with three particle sizes 83%, 95%, 100%, respectively.
Embodiment 3
[0081] Taking PE as an example, the recovery rate of film-like, fibrous, and granular PE microplastics (500-1000 μm) in soil is studied. The specific process refers to Example 1. The recovery rates of the three shapes of PE microplastics reach 80% respectively. , 83%, 95%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Diameter
aaaaa
aaaaa
The inside diameter of
aaaaa
aaaaa
Outer diameter
aaaaa
aaaaa
Login to view more
Abstract
The invention discloses a device for circularly separating soil microplastics based on a sodium bromide solution. The device comprises a separation system, a vacuum filtration system and a solution recovery system, wherein the separation system comprises a separator, an aeration disc, a tray and an adjustable aeration pump; the vacuum filtration system comprises a filtration bottle, a vacuum filtration pump and a sand core filter; and the solution recovery system comprises a separating funnel and a circulating pump. The invention also discloses a method for circularly separating the soil microplastics based on the sodium bromide solution. According to the invention, saturated sodium bromide is selected as a separation reagent of the soil microplastics; with combination with an aeration process, the microplastics float on the upper layer of a soil mixed solution, after the solution stands still and is layered, the microplastics overflow from pores of a container through aeration and solution adding power, the microplastics are collected through the vacuum filtration device, the sodium bromide solution is recycled through the recovery system, cost is greatly saved, low emission of sodium bromide is achieved, and environment protection is facilitated.
Description
technical field [0001] The invention belongs to the field of separation technology, and relates to a device and method for separating soil microplastics based on sodium bromide solution circulation. Background technique [0002] With the mass production and use of plastics, the microplastic pollution formed by its fragmentation has received widespread attention recently. Microplastics are tiny plastics with a size less than 5mm (Thompson R C, Russell A E. Lost at sea: where is all the plastic? Science, 2004, 304(5672): 838), including fragments, fibers, particles and films in different forms, Divided into polyethylene, polypropylene, polyvinyl chloride and other types. Due to the large amount of plastic discarded into the surface soil environment, how to separate these microplastics from the soil medium is an urgent problem to be solved. [0003] For the separation of microplastics in complex media, the traditional method is mainly based on the principle of density separat...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more