Arbejdsrapport fra Miljøstyrelsen, 15/2005 – Rensning af Miljøfremmede stoffer i vandværksfiltre

Rensning af Miljøfremmede stoffer i vandværksfiltre

Summary

In order to solve problems related to water works treatment, it is often desirable to be able to conduct experiments under controlled conditions and at the same time be able to add compounds that cannot be added under normal water works practice. Examples are experiments where the removal of xenobiotic compounds and undesirable natural compounds is studied. Such compound are gasoline compounds, pesticides, arsenic, etc.. The purpose of this project has been to build a highly automated water works pilot plant that in a later stage can be used to study the removal of xenobiotic compounds and unwanted natural compounds.

The pilot water works that has been built can relatively easily be placed within a real water works where it can be operated by its own for an extended period of time due to the automatic monitoring and control, which has been implemented by the programme LabViev. The monitoring and control has been implemented in a flexible way which enables operation of the plant from being automatic, semi-automatic to manual. It is also easy for the operator to change the operational strategy and to follow the operational results. The pilot plant has two filters, one of them containing quarts sand as filter material and the other containing Filtralite®, which is an expanded clay material.

This report describes the construction of the pilot plant and the function of the monitoring and control system using LabViev. The properties of the filter materials are described on the basis of tracer experiments and modelling of the hydraulic behaviour using the programme AQUASIM. The functioning of the monitoring system is illustrated by measurements of temperature, conductivity and oxygen concentration.