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CP517  On-line Metals Analysis in Water Monitoring

On-line analysis of iron, aluminium and manganese at water treatment works uses automated wet-chemistry analysers, but these are expensive to run and require frequent and skilled maintenance. A new approach is needed.

Currently there are two main suppliers of these analysers and the basic concept has remained unchanged for several decades. Whilst they provide good measurement, they are expensive to run and in some cases there are health and safety issues related to the handling and disposal of dangerous chemicals. For this reason these instruments tend to be used only where deemed necessary in order to meet compliance.

Water companies also require a reliable, robust and cost effective on-line solution to monitoring other problem metals/metalloids such as nickel and arsenic. This is being addressed with some new approaches emerging, such as the Robotic Water quality Analyser (RWA) by Pollution & Process Monitoring and electrochemical OVA analysers from Modern Water. Other technologies are under development by research teams at Universities such as Liverpool.

This project will evaluate the suitability of these emerging monitoring technologies for application at different points within water treatment and supply and provide clear recommendations to support investment decisions by water companies. These will be based on direct comparison and benchmarking under controlled conditions.

BUSINESS BENEFITS TO CLIENTS

  • Informed investment decisions, backed up by detailed information on costs, risks and practical considerations in implementing this technology.
  • Improved compliance through use of effective instrumentation for metals monitoring at WTW.
  • Specific needs and requirements fed back to the supply chain to support the further development of highly beneficial tailored technologies.

WORK PROGRAMME

  1. Review of available technologies including discussions with technology suppliers and end-users.
  2. Agree the instruments for evaluation and the test conditions.
  3. Side-by-side laboratory performance testing.
  4. Benchmark technologies using gathered performance, maintenance and total cost of ownership data.
  5. Production of evaluation report.

PROJECT OUTPUT AND IMPLEMENTATION

Independent evidence and information on selected on-line metal analysers to enable informed decision making by process scientists and procurement engineers, including:

  • A technology review.
  • Performance testing results.
  • Performance and cost comparisons with recommendations for application.

RELATED WRc WORK

Independent testing and evaluation of a wide range of instrumentation for both manufacturers and end users. Recent examples include chlorine monitors, IMS technology, turbidimeters and dissolved oxygen monitors.

WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

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