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Discolouration in potable water distribution systems: a review
1Technical University Delft, Kiwa Water Research, The Netherlands. j.h.g.vreeburg@tudelft.nl
Water Research
|December 19, 2006
Summary
Water companies need better tools to manage discoloured water, moving from reactive to proactive control. This study reviews predictive models and direct measurement methods to assess and manage discolouration risks in water distribution systems.
Area of Science:
- Water quality management
- Environmental engineering
- Hydraulic engineering
Background:
- Discoloured water is a major cause of customer complaints for water supply companies.
- Current management of discoloured water is reactive, necessitating a shift to planned, proactive control strategies.
- Improved understanding of discolouration processes and predictive tools are crucial for water utilities.
Purpose of the Study:
- To review and assess practical tools for the planned management and control of discolouration in water distribution systems.
- To evaluate the effectiveness of existing and novel approaches in predicting and mitigating discolouration events.
- To identify research gaps in understanding material accumulation and control strategies.
Main Methods:
- Review of two distinct approaches: the PODDS (Prediction Of Discolouration in Distribution Systems) model and the resuspension potential method.
- The PODDS model predicts turbidity based on hydraulic changes, requiring calibration.
- The resuspension potential method directly measures discolouration risk from controlled hydraulic changes.
Main Results:
- Both reviewed methods aid in decision-making for maintenance operations to control discolouration risk.
- The PODDS model offers predictive capabilities, while the resuspension potential method provides direct risk assessment.
- Sustainable measures like self-cleaning thresholds and improved source control are discussed but require further research for cost-benefit analysis.
Conclusions:
- Proactive management of discoloured water requires ongoing maintenance and potentially significant investment in infrastructure or treatment.
- Further research is needed to quantify factors influencing material accumulation and to understand the cost-effectiveness of preventative measures.
- Implementing strategies like self-cleaning thresholds and improved particle control can prevent re-accumulation of discolouration material.
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