Integrated device and method for enrichment, purification and separation of microplastics in secondary effluent

A method for enrichment, purification and separation of microplastics in a secondary effluent, comprising:

• mounting marked screen meshes labeled with respective mesh numbers respectively in filtering units of all stages integrated in a filtering system in an order that the mesh numbers of the marked screen meshes are decreased successively with an increase of the stage of the filtering unit;
• adding a secondary effluent from a wastewater treatment plant into the filtering system, wherein microplastics in the secondary effluent are retained on a surface of the marked screen meshes mounted in the filtering unit of each stage, and then spraying ultra-pure water on the surface of the marked screen mesh by a micro-spray system to obtain enriched microplastics;
• mounting a fixed screen mesh in the filtering unit of each stage to perform in-situ purification and separation of the enriched microplastics;
• and
• leaving the filtering system standing in a constant temperature environment to remove residual moisture from surfaces of the microplastics, followed by taking the marked screen meshes out of the filtering unit of each stage to analyze and identify relevant properties of the microplastics.