Case Study: NAWA WTP -Tipp City, OH 1-MGD NF Concentrate Management

The primary purpose of feeding antiscalant at a membrane plant is to prevent calcium deposits on the membranes. A secondary benefit of feeding antiscalant is to keep calcium in suspension until the concentrate is discharged. However, if retention time of the concentrate exceeds the scale control limits of the antiscalant scale formation forms on the discharge piping. The effects of antiscalant dose, concentrate pH and iron carryover from mixing with filter backwash water will be examined.

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