Water Treatment Plant Designer — Ebora Environmental Engineering

🏭 Water Treatment Train

Water Treatment Plant Designer

Size the core units of a conventional surface-water plant from the design flow: rapid mix & flocculation (detention, velocity gradient G & power), a sedimentation basin (surface area from overflow rate, volume & depth, L×W), and rapid sand filters (area from filtration rate + number of units). Water temperature sets the viscosity used for the G-power.

⭐ Free to use · Balance … EP

① Design flow

Design flow Q (m³/day)

Population served (persons)

Per-capita demand (L/person·day)

Typical 120–200 L/p·d. Verify with your design basis.

Water temperature (°C)

Sets dynamic viscosity μ for the G-power calc.

② Rapid mix & flocculation

Rapid-mix detention time (seconds)

Typical 20–60 s.

Rapid-mix velocity gradient G (s⁻¹)

Typical 700–1000 s⁻¹.

Flocculation detention time (minutes)

Typical 20–40 min.

Flocculation velocity gradient G (s⁻¹)

Typical 20–70 s⁻¹.

③ Sedimentation & filtration

Sedimentation overflow rate (m³/m²·day)

Surface loading; typical 20–40 m³/m²·d.

Sedimentation detention time (hours)

Typical 2–4 h.

Sed. basin Length : Width ratio

Rectangular basin, typical 3–5.

Filtration rate (m³/m²·day)

Rapid sand: typical 120–240 m³/m²·d.

Number of filter units

Area split equally; ≥2 so one can backwash.

🏭 Treatment plant design

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Conventional water treatment train

Design flow

Flow

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Flow

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Flow

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Viscosity μ (at T)

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Rapid mix & flocculation

Rapid-mix volume

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Rapid-mix power

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Flocculator volume

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Flocculator power

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Rapid-mix Gt

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Flocculation Gt

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Sedimentation basin

Surface area

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Basin volume

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Depth

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Length L

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Width W

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Horizontal velocity

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Rapid sand filtration

Total filter area

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No. of filters

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Area per filter

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Plan per filter

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Worked solution

⚠️ Verify before design. Overflow, filtration, velocity-gradient and detention values are typical design figures. Final unit sizes, number of units, and water-quality targets must follow the PNSDW, the DENR guidelines, accepted texts (Davis & Cornwell / Reynolds & Richards), and your course references. This tool is a study/estimating aid.