Finite element modeling of slow water filtering

TL;DR

This paper presents a multiphysics finite element model of slow sand filtration using Comsol, addressing the complexity of water and pollutant interactions and the lack of detailed kinetic data to improve theoretical understanding.

Contribution

It develops a comprehensive multiphysics simulation approach for slow filtration, integrating complex Navier-Stokes equations with kinetic coefficients, which was previously lacking.

Findings

Successful modeling of various filter geometries

Enhanced understanding of water-pollutant interactions

Potential to optimize filter design and operation

Abstract

Slow sand filtration is most appropriate where there is funding to subsidize the initial cost of the filter, available training for use and maintenance, locally available sand, and a transportation network capable of moving the filter. Since the experimental study of slow filtration is taking a long time, theoretical analysis, modelling and simulation studies become important. Theoretical models of slow filtration are not yet sufficiently developed. Several reasons are hindering modelling and simulation: due to the complexity of the interaction of water and pollution with filters and the lack of detailed values for the kinetic coefficients in elementary processes. Multiphysics modelling using Comsol, where a complex set of Navier-Stokes equations is numerically solved together, with the molecular awareness for the kinetic coefficients, was used to studying various geometries and construction types of slow filtration.