Previous tailored and thematic research work focused on iron and manganese removal from groundwater and led to the development of a first version of a software application (IJzersterke tool). But our knowledge of colloidal iron and manganese and their relation to water quality is still not profound enough.
In this proposal we aim to deepen our understanding of the removal mechanisms in relation to different water-quality parameters, as well as the role of particle size, load and composition. The project studies with Ferramentum the occurrence and filtering of colloidal iron and manganese using rapid filters. The deeper insight should allow us to improve the model in the software tool – that is, to make the research application-ready. This project will result in more understanding and an improved tool.
Research into removal mechanisms in rapid filters
In this proposal we aim to deepen our understanding of the mechanisms that play a role in the removal of iron and manganese by the filter bed, in relation to different water-quality parameters as well as the role of particle size, load and composition. We are studying with Ferramentum the occurrence and filtering of colloidal iron and manganese using rapid filters. The deeper understanding should make the research application-ready.
The IJzersterke software application tool can predict – on the basis of feed water quality, sorption isotherms and a model for oxidation kinetics and sorption – the iron and manganese removal over the height of the filter bed of a rapid filter. The model and the insights are not yet complete: there is a spread in the model and measurement results of the sorption by the filter medium; the model requires validation; and there is a lack of interaction with other processes.
Activities: experiments and models
The project involves the following activities:
1. Experimentally determining the occurrence and removal of (colloidal) particles by the filter bed by:
- (1.1) conducting research into heterogenous oxidation kinetics;
- (1.2) characterising and measuring the formation of colloids and (metal oxide) particles, and
- (1.3) determining the filterability and the influence of the filter medium.
To this end, we will study the iron (Fe) and manganese (Mn) oxides, conduct measurements at one or several production sites, and carry out a literature scan and lab analyses.
2. Modelling and implementing: a selection of results from WP1 is being modelled and implemented in the existing software application.
3. Improving the tool: we are making the software better with a view to the functionality desired by users. This concerns a faster operation and the importation of measurement data.
4. Recording, transferring and publishing.
Among other things, we will ensure a BTO report, consultation opportunities and a scientific publication.
The outcomes: more insight and improvement of the software application
The project’s outcomes will be:
- More basic insight into the functioning of a rapid filter, to make it possible to focus more effectively on water quality and particle prevention. The insights will be collected in a scientific paper.
- An improved ‘IJzersterke tool’ software application, by modelling and implementing several research results, improving calculation speed and adding functionality to depict measurement points.