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Process Flow Diagrams

Process Flow Diagrams. Why are PFDs important to optimizing a water plant? Understand process Train new people Question legacy decisions Understand changes to process. Building a PFD – Step 1. Identify the major unit operations in the process Doesn’t have to be complicated. Coagulation.

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Process Flow Diagrams

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  1. Process Flow Diagrams • Why are PFDs important to optimizing a water plant? • Understand process • Train new people • Question legacy decisions • Understand changes to process

  2. Building a PFD – Step 1 • Identify the major unit operations in the process • Doesn’t have to be complicated Coagulation Filtration Pre-Sedimentation Flocculation / Sedimentation Clearwells

  3. Building a PFD – Step 2 • Identify chemical feeds • May require some investigation Alum Polymer Polymer Hypochlorite Coagulation Filtration Pre-Sedimentation Flocculation / Sedimentation Clearwells

  4. Turbidity Building a PFD – Step 3 • Identify monitoring points • Both grab and online Alum Polymer Polymer Hypochlorite Cl Residual Coagulation Filtration Pre-Sedimentation Flocculation / Sedimentation Clearwells Streaming Current

  5. Example PFD

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