RO ANTISCALANT

Concentrate scaling screen & TRISPE® rule matching

The workflow mirrors mainstream RO projection tools: convert recovery to a concentrate multiplier (optionally including concentration polarisation), evaluate SDSI, common salt saturation ratios, a silica solubility ratio and magnesium scale tendency (Mg(OH)₂ / magnesium silicate), then return a feasibility verdict, a suggested dose range and the matching TRISPE® grades. All calculations stay in your browser.

Method notes & limitations (click to expand)

Single-stage RO: CF = 1/(1−Y), consistent with mass-balance recovery inputs in ROSA / IMSDesign-style tools.
Membrane-side conservative concentration ≈ feed × CF × CP with CP as a single lumped polarisation factor.
CaCO₃ tendency uses a Stiff–Davis style pHs and SDSI; concentrate pH is not iterated with carbonate equilibrium.
Sulfate and barium/strontium ratios use 25 °C Ksp values versus molar ion products — no activity coefficients or ion pairing.
Amorphous silica uses an empirical solubility curve; membrane vendor limits may differ — verify in their official tools.
Magnesium feeds two screens: Mg(OH)₂ saturation (25 °C Ksp, with [OH⁻] from pH and pKw(T)) and an empirical magnesium silicate product criterion (Mg as CaCO₃ × SiO₂ ≥ 35000 with pH ≥ 7.5). Both are engineering screens only.
Feasibility uses generic antiscalant control limits as thresholds (SDSI ≤ 1.8, CaSO₄ ≤ 230%, BaSO₄ ≤ 6000%, SrSO₄ ≤ 800%, CaF₂ ≤ 10000%, SiO₂ ≤ 2× empirical solubility, Mg(OH)₂ ≤ 100%). Limits vary with formulation and vendor guarantees — confirm against the product manual and a field trial.
Suggested doses are empirical ranges scaled by scaling severity, not vendor guarantees; a formal programme must be set by an engineer with a full water analysis.

0. Report header (print / PDF)

Company— Designer— Report date— Report no.auto Project—

1. System

Recovery Y% Concentration polarisation CP—

2. Feed water

pH— Temperature T°C Calcium hardnessmg/L as CaCO₃ Magnesium hardnessmg/L as CaCO₃ M-alkalinitymg/L as CaCO₃ Sulfate SO₄²⁻mg/L Chloride Cl⁻mg/L TDSmg/L Barium Ba²⁺mg/L Strontium Sr²⁺mg/L Fluoride F⁻mg/L Silica SiO₂mg/L Iron Fe (total, optional)mg/L

3. Scenario flags

Phosphorus-free / environmental requirement Seawater / high salinity Landfill leachate membranes MVR evaporator train Prioritise silica control High iron feed Acidic feed side (favours 4001 when P-free)

4. Dosing (standard-strength basis, optional)

Enter the target dose on a standard-strength (working) basis. If you inject a concentrate, select it and enter fold N vs that standard basis — annual mass uses the commercial product ppm (= standard ppm ÷ N).

Product form

Standard strength Concentrate

Fold N vs standard basis× Dose (standard basis)ppm Feed flow Q_fm³/h Annual operating hoursh/yr

This tool is a simplified engineering screen — not a replacement for full membrane projection software. Final product selection, dose and cleaning strategy must be confirmed with complete water analysis, element limits and field optimisation.

RO Antiscalant Selector

Concentrate scaling screen & TRISPE® rule matching

Need ROSA / IMSDesign-grade projections?