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The Influence of Water Treatment on Corrosion of Materials in Service Lines and Drinking Water Installations

The Influence of Water Treatment on Corrosion of Materials in Service Lines and Drinking Water Installations. Josef Klinger TZW Karlsruhe. TZW Karlsruhe Prüfstelle Wasser. Why to change the Water Treatment?. Water quality problems New raw water resources Merger of small water utilities

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The Influence of Water Treatment on Corrosion of Materials in Service Lines and Drinking Water Installations

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  1. The Influence of Water Treatment on Corrosion of Materials in Service Linesand Drinking Water Installations Josef Klinger TZW Karlsruhe TZW Karlsruhe Prüfstelle Wasser

  2. Why to change the Water Treatment? • Water quality problems • New raw water resources • Merger of small water utilities • Corrosion problems – desalination • Consumer complaints – central softening

  3. Central Softening • Precipitation (NaOH, Ca(OH)2) • Addition of acids (cooling water) • Ion exchange • Membrane filtration (nanofiltration, reverse osmosis)

  4. Membrane Filtration

  5. Reverse Osmosis • 1 Feed 3 Feed spacer 5 Membrane 7 Permeate header • 2 Permeate 4 Concentrate 6 Permeate spacer 8 Sealing to pressure pipe

  6. Hardness Corrosion Limit value Example out of the Practice Raw water quality

  7. Pilot Study for Water Treatment Version A Mixture of desalinated water and aeration Version B 100 % RO and stabilisation of desalinated water with CaCO3

  8. Parameters of the Test Waters in the Pilot Plant

  9. Closed Loop Device for Corrosion Tests with Iron Pipes

  10. Corrosion and Iron Migration Rates

  11. Mechanical Stability and Iron Migration Rates

  12. Corrosion Rates with changed Water Quality

  13. Example of a „Turner Diagram“

  14. Metallurgical Structure of Duplex a/b-Brass Source: Wieland-Werke AG

  15. Running Time: 220 Days Metallographical Grindings of the test pieces

  16. Metallographic Sections of the test pieces Tempered Brass Material: CuZn40Pb2 Running Time: 220 Days Test Water 1 Tap Water with Inhibitor Tempered Brass Material: CuZn40Pb2 Running Time: 220 Days Test Water 3 (100 % RO + stabilisation)

  17. The new Treatment Plant

  18. Summary • The influence of a changed water quality on corrosion processes was assessed in a pilot plant • Corrosion assessment tools are available • Treatment plant is in service since two years • Corrosion processes are controlled as predicted • Prediction based on pilot plant tests were successful

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