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Method for separating microplastics from biochar

A separation method and biochar technology, applied in the field of separation of microplastics and biochar, can solve the problems of low separation efficiency and difficulty in separating small-sized particles, and achieve high separation efficiency, promotion of effective separation, and low equipment requirements. Effect

Active Publication Date: 2021-11-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the above-mentioned separation methods all have the disadvantage of being difficult to separate particles with small particle sizes, and the separation efficiency is extremely low.

Method used

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  • Method for separating microplastics from biochar

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. Aeration flotation: Add biochar and microplastics to a low-temperature-resistant 1000mL beaker at a mass ratio of 1:0.5, then add ultrapure water to obtain a mixture of biochar and microplastics, and use an aeration pump Continuously aerate the mixture of biochar and microplastics, so that the microplastics float on the upper layer of the mixed solution, and the biochar is deposited on the lower layer of the mixed solution to obtain an aeration solution;

[0034] Step 2. Aggregation and freezing: Add rapeseed oil to the aeration solution obtained in step 1, so that the microplastics gather in the oil layer with a thickness of 4 cm formed by the rapeseed oil on the top of the aeration solution, and the biochar is deposited in the aeration solution In the lower water layer, after standing for 30 minutes, freeze at -20°C for 24 hours, so that the oil layer does not solidify but the water layer solidifies, and t...

Embodiment 2

[0039] The difference between this example and Example 1 lies in that: in step 1, biochar and microplastics are prepared in a mass ratio of 1:1 to prepare a mixed solution.

[0040] After testing, the recovery rate of the microplastics separated in this embodiment reached 89.51%.

Embodiment 3

[0042] The difference between this example and Example 1 lies in: in step 1, biochar and microplastics are mixed according to the mass ratio of 1:2.

[0043] After testing, the recovery rate of the microplastics separated in this embodiment reaches 92.43%.

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Abstract

The invention discloses a method for separating micro-plastics from biochar. The method comprises the following steps: 1, aerating a mixed solution of biochar and micro-plastics to obtain an aerated solution; 2, adding oil into the aerated solution, and freezing to obtain a refrigerating fluid; 3, separating an oil layer on the upper layer of the refrigerating fluid, feeding the obtained subnatant into a separator filled with water, and aerating, so that the micro-plastics in the subnatant enter a collecting barrel to obtain a microplastic crude product; and 4, carrying out suction filtration on the microplastic crude product, washing filter residues, and drying to obtain the microplastics. According to the method, the microplastics and the biochar are layered through aeration flotation according to the density and floating performance differences of the microplastics and the biochar, then the biochar and the microplastics are separated in an oil-water freezing separation mode according to the different freezing points of oil and water, the microplastics are collected through aeration separation again, effective separation of the microplastics and the biochar is achieved, the separation effect of the microplastics and the biochar is greatly improved, and the recycling efficiency of the microplastics is improved.

Description

technical field [0001] The invention belongs to the technical field of plastic separation, and in particular relates to a method for separating microplastics and biochar. Background technique [0002] There are a large number of active components of natural organic matter in the soil. As an important component of natural organic matter, biochar can transform and degrade organic pollutants in soil. Microplastics are an increasing class of emerging organic pollutants in the environment. Because of their small particle size (<5mm), they are easily ingested into organisms and enriched through the food chain, causing serious environmental and health problems. When the two exist in the soil environment at the same time, due to the density of biochar (0.8-1.7g / cm 3 ) and the density of microplastics (0.9-1.5g / cm 3 ) are very similar, and it is difficult to separate the two using conventional methods. [0003] At present, the methods for separating microplastics and other soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/02C08J11/06
CPCB29B17/02C08J11/06B29B2017/0244B29B2017/0248B29B2017/0234Y02W30/62
Inventor 李霄云李娜娜刘伊凡张金龙李涛
Owner SHAANXI NORMAL UNIV