Separation extracting device and method for micro plastic in soil

Abstract

The invention discloses a separation extracting device and method for micro plastic in soil and belongs to the technical field of solid waste treatment. The device comprises a separating system and afiltering system; through a magnetic stirring device, a flotation solution and samples in a separating pond are stirred uniformly; after standing, the samples in the separating pond are layered; at this moment, micro plastic particles, small in density, in the soil samples are suspended in the solution upper layer, namely a non-precipitating layer; heavy sediment settles on the solution bottom layer, namely a precipitating layer; then flotation liquid in a liquid storing tank flows into the upper layer, namely the non-precipitating layer, of the separating pond through a liquid entering pipe;meanwhile, bubbles generated at the position of an aeration head of an aeration pump are utilized for driving the upper layer solution containing the micro plastic to flow into an extraction filteringdevice to be filtered, and therefore the purpose of separating is achieved. The device is simple and efficient, easy to operate, green and economical in separating method and good in separating effect.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a device and method for separating and extracting microplastics in soil. Background technique [0002] Plastic materials are mass-produced and used in industry, agriculture and daily life because of their advantages such as low cost, good ductility, durability, lightness and waterproof, and bright colors, which provide great convenience to people. It is precisely because of the convenience it brings that the annual growth rate of global plastic production has maintained an average of 8.5% since the 1950s, and by 2018, the global plastic production has almost reached 3.6×10 8 tons, and according to the database, the cumulative output of plastic products in my country in 2018 was 60.4215 million tons. [0003] While enjoying the great convenience brought by plastics and plastic products, people pay more and more attention to the harm caused by plastic particles with a ...

AI Technical Summary

Problems solved by technology

Although microplastics are ubiquitous in the terrestrial environment, due to the influence of soil texture, organic matter and aggregate structure, it is more difficult to extract microplastics from soil than from water and sediments. The separation and extraction of microplastics in soil, Little research has been done on identification analysis

[0005] So far, no efficient and feasible standard method has been established for the separation and analysis of microplastics in soil and even the entire natural environment. Provide technical support and methods for research

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