A Method for Evaluating the Competitive Adsorption of Polystyrene Microspheres and Humic Acid in Sand Filtration

Abstract

The invention discloses a method for evaluating the competitive adsorption of polystyrene microspheres and humic acid in sand filtration: polystyrene microspheres and humic acid are injected into a sand filter column, and the concentration of pollutants penetrating through the filter column at different times is measured and the concentration of pollutants at each depth of the retention filter column, draw the breakthrough curve and retention curve; set parameters in the HYDRUS 1D software; establish a one-dimensional numerical model of saturated solute migration, a model representing different competitive adsorption degrees, and obtain the breakthrough of a single pollutant. The penetration curve and retention curve; according to the breakthrough curve and the empirical value obtained from the simulation of a single pollutant, estimate and input the initial prediction value of the relevant parameters, optimize the specific parameters, and respectively fit the breakthrough curve and retention curve of the two pollutants; Choose the model that best fits the measured data to assess the extent of competitive adsorption. The invention adopts different models to fit the breakthrough curve and the retention curve, so as to better understand the interception mechanism and mutual influence of the two pollutants in the process of synergistic migration of polystyrene microspheres and humic acid in sand filtration.

Description

A method for evaluating the competitive adsorption of polystyrene microspheres and humic acid in sand filtration technical field The present invention relates to the field of synergistic migration of pollutants, more specifically, relate to a kind of polystyrene in the evaluation sand filter A method for the competitive adsorption of microspheres and humic acid. Background technique In recent years, drinking water pollution has attracted much attention, and microplastics, as a new type of pollutants, have It is more difficult to deal with, and it often co-migrates with other pollutants (such as humic acid) in the water environment, causing greater damage. Potential Hazard. Polystyrene microspheres are a typical microplastic that may pass static electricity when coexisted with humic acid. Interactions, van der Waals forces, ligand exchange reactions, etc. interact, resulting in changes in the migration behavior of the two pollutants. This may have greater potential...

AI Technical Summary

Problems solved by technology

Most of the solute migration simulation studies based on HYDRUS 1D in the past only considered a single substance, and there were almost no studies based on its simulation of the coordinated migration process of microplastics and other pollutants. Therefore, for pollutants such as microplastics and humic acid in sand filtration The co-simulation research is still lacking. The degree of competitive adsorption caused by the coexistence of two pollutants is still unclear. An evaluation method needs to be proposed to understand this process.

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