Project

Central Softening of drinking water A new calcium carbonate precipitation analysis

Publisher

Supervisor

Location

Greater Copenhagen area

The water utility HOFOR A/S is currently implementing central drinking water softening in the Greater Copenhagen area. In areas with hard drinking water, softening can provide a number of positive socioeconomic and environmental effects experienced by the end users (households or industries) due to reduced problems with lime scaling, a longer service life of household appliances and installations, and reduced of soap and detergents.

 

Softening processes often focus on the reduction of water hardness. However, water hardness is not the only and maybe not the most accurate indicator of the actual lime scaling in kettles, toilets and onto tiles, and so maybe it does not reflect how water consumers actually experience the effects of softening at home.

 

An alternative to hardness is the calcium carbonate precipitation potential (CCPP) modelled in PHREEQC to predict the lime scaling potential from a water sample. Similarly, the measured calcium carbonate precipitation (MCCP) in a water sample can be analyzed in the laboratory by boiling a water sample. We want to test if this simple analysis gives a more precise indication of what users are experiencing in terms of lime scale deposits at home.

 

To investigate how the implementation of central drinking water softening in Copenhagen affects the consumers, HOFOR A/S is interested in developing MCCP analysis in their laboratory. With this analysis it would possible to measure and compare water samples, from i.e. different places in Copenhagen, different technologies or different waterworks, for instance the MCCP in water from the softening plant in Brøndby could be compared with water from plants in the rest of the Greater Copenhagen area.

 

Hence, this project aims at implementing MCCP analysis at HOFOR laboratory in close collaboration with HOFOR lab technicians and at comparing results from MCCP analyses and CCPP calculations using water from different waterworks and softened by different methods. This has the potential of providing better tools for optimizing the implemented softening technologies and predicting the water consumers’ experience.  

 

In collaboration with

HOFOR

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Contact

Company / Organization

DTU Miljø

Name

Berit Godskesen

Position

Postdoc

Mail

berg@env.dtu.dk

Supervisor info

Miljø

Supervisor

Berit Godskesen

Co-supervisors

Hans-Jørgen Albrechtsen, Martin Rygaard, Camilla Tang

ECTS credits

15 - 35

Type

BSc project, MSc thesis

MSc in Environmental Engineering

Supervisor

Berit Godskesen

Co-supervisors

Hans-Jørgen Albrechtsen, Martin Rygaard, Camilla Tang

ECTS credits

15 - 35

Type

BSc project, MSc thesis

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


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