Trial design and interpretation

Split the same raw water into test groups and fix mixing conditions and supernatant sampling position. Track floc settling, supernatant turbidity and pH over time. Keep both curves if the candidate that settles faster initially performs worse at the endpoint.

Recording Alumina (Al₂O₃)

Alumina (Al₂O₃) (Mass fraction): ≥ 29%. Ask whether the COA uses an as-supplied or dry basis. Convert to the same basis before comparing prices per tonne. Basicity (%): 40.0–90.0. Check the offered grade’s method and range. Use site water to screen grades within a broad catalogue range.

How can we compare quotations for two concentrations?

For delivered tonne prices and as-received assays, cost per tonne of Al₂O₃ equals product price per tonne divided by the Al₂O₃ mass fraction. Then compare chemical cost per tonne of water at the same treatment target. Powdered PAC for industrial water: Check raw water pH, alkalinity, turbidity and temperature. Compare powder dissolution, settling time and treated-water turbidity.

What to record

  • Raw-water batch
  • Basicity and dose
  • Settling time
  • Supernatant turbidity

Technical references

Products and processes

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