Flotation gathering device and screening method for microplastics

Abstract

The invention discloses a flotation gathering device and a screening method for microplastics. The basic principle is that the difference of adhesion characteristics of bubbles on hydrophilic and hydrophobic materials can be changed based on a biosurfactant, and a high-density flotation solution can improve the separation effect on the high-density microplastics. The device comprises a flotation solution storage device, a separation pipe, an aeration device and a suction filtration device, wherein the aeration system is used for generating ascending gas to strengthen stirring of the system, and microplastics are coated with small bubbles to be rapidly separated. After standing, the flotation solution is pushed by a flotation solution system to overflow from an upper opening, and the separation performance of the microplastics is improved. The microplastic flotation separation device disclosed by the invention is simple and easy to operate, high in recovery rate of microplastic particlefragments, recyclable in flotation liquid, high in practicability and low in cost, and can be widely applied to gathering and screening of environmental microplastics.

Description

technical field [0001] The invention relates to the technical field of micro-pollutant environmental detection, in particular to a micro-plastic flotation enrichment device and a screening method thereof. Background technique [0002] As a new type of pollutant, microplastics (<5mm) can release toxic and harmful substances in the water environment, such as bisphenol A, phthalates, etc. Formic esters, etc. Microplastics are easy to adsorb toxic and harmful substances due to their large specific surface area, such as persistent organic pollutants such as polychlorinated biphenyls and polycyclic aromatic hydrocarbons. Microplastics and these pollutants aggregate to form organic pollution spheres, which can eventually pass through the food chain. endanger human health. [0003] To measure microplastics in the environment, the first step is to enrich and screen samples. Combining literature research and actual research, it can be found that the following problems still exist...

AI Technical Summary

Problems solved by technology

Combining literature research and actual research, it can be found that the following problems still exist in the monitoring of microplastics in the water environment: First, the sampling and sorting methods lack norms and standards, and are relatively random

Second, the flotation, separation and measurement methods are inefficient and cannot meet the investigation and routine monitoring of large-scale and large-sample volumes. It is necessary to strengthen the research and development of efficient, convenient, cheap and safe technical methods

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