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Device and method for circularly separating soil microplastics based on sodium bromide solution

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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention aims to solve the problems of large reagent consumption, long time consumption and difficulty in separating high-density microplastics in the process of separating soil microplastics

Method used

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  • Device and method for circularly separating soil microplastics based on sodium bromide solution

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%.

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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

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Application Information

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IPC IPC(8): B09C1/08
Inventor 何德富刘梦婷陆诗博宋杨曹承进
Owner EAST CHINA NORMAL UNIVERSITY
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