Chemical Dosing & Metering Pumps
Positive-displacement metering pumps used to dose antiscalant, acid, coagulant, and cleaning chemicals at controlled rates into RO and water treatment streams. Dose rate is set from chemical demand, feed flow, and delivered product concentration.
Engineering Application
Antiscalant dosing to keep sparingly soluble salts below saturation in the concentrate, acid dosing for carbonate-scale control, and coagulant/coagulant-aid dosing in pretreatment.
Key Parameters
| Parameter | Unit |
|---|---|
| Dose rate | mg/L (ppm) as product |
| Feed flow | m³/h |
| Product concentration | % |
Related Engineering Tools
RO Recovery Calculator
Calculate RO permeate and concentrate flow from feed flow and system recovery rate.
Recovery (%) = (Permeate Flow / Feed Flow) × 100 RO Mass Balance Calculator
Simplified TDS-based dissolved-solids balance for RO feed, permeate, and concentrate flow and quality checks.
Qf · Cf = Qp · Cp + Qc · Cc RO Scaling Risk & Pretreatment Analysis
Screen CaCO3 scaling risk in RO feed and concentrate using the Langelier Saturation Index (ASTM D3739) and the Stiff & Davis Stability Index (S&DSI) for high-TDS and seawater feeds.
LSI = pH − pHS · S&DSI = pH − pCa − pAlk − K RO Concentration Factor & Salt Load Calculator
Compute RO water concentration factor (CF = 1/(1−Y)) and the salt load carried to concentrate for scaling and disposal analysis.
CF = 1 / (1 − Y) · Salt Load = Q_f × C_f × Y_loading RO Antiscalant & Chemical Dosing Calculator
Calculate antiscalant (or chemical) dosing rate and 100% active-equivalent flow from dose concentration and product strength.
Dose Flow = Q_feed × Dose_ppm / (C_prod × 100) (SG-adjusted)