Design Manual › Primary › Lamella settler
FREE ENGINEERING TOOL · PRIMARY

Lamella (Inclined-Plate) Primary Settler

Set the flow, plate loading and module geometry — get the required plate (projected) area, the plate count per module, the number of modules and the compact plan footprint. The retrofit answer when you must add primary treatment without adding land.

1Duty & plates

Inclined plates stack the settling surface vertically, so plan area collapses. Size by plate (projected) loading — lamella runs higher than a conventional basin because the path is short.

Results — plates & footprint

Plate area
—m²
Total plates
—#
Plan footprint
—m²
ItemValueBasis

2Module geometry

How the plates pack into a shippable module and how little plan area it occupies.
ItemValueBasis

Operation envelope

ItemValueBasis

Quote the settler instruments at factory price

A lamella settler still needs a level transmitter, sludge blanket and an inlet TSS monitor — mappable to our catalogue and supplied at the manufacturer's ex-works price (margin from the export rebate only).

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Sources & parameter basis

[1]Lamella / tube-settler practice (Hazen, WEF) — plate angle 50–60°, spacing 25–100 mm, plate projected loading typically 2–8 m/h (higher than conventional because the settling path is short); module height 1.5–3 m.
Full derivation and worked example: Lamella-Primary-Calculation-Sheet.md. The lamella settler is the retrofit primary — run it, then carry Q into the biological unit. In practice lamella occupies ~1/5–1/10 the plan area of a conventional clarifier.
How much plate area does a lamella primary settler need?

The required plate area is the projected (inclined) settling area, not the plan area, and the calculator derives it from the design flow so the plate loading stays within the settling limit.

How many plates per module and how many modules are needed?

Plates are counted per module from the module height and plate spacing, and the number of modules follows from the total plate area, so both are sized consistently.

How much floor space does a lamella settler save?

Inclined plates stack the settling area vertically, so the calculator reports the compact plan footprint for the same duty, which is where the space saving comes from.

Is a lamella settler suitable for tropical municipal primary treatment?

Yes - the calculator is set up for tropical municipal primary treatment, where the footprint saving matters most on constrained sites.

© 2026 Nanjing JiuYuHui Environmental Technology Co., Ltd. · jiuyuhub.com · Municipal WWTP design manual — Primary (variant).
⚠ Screening values only. Outputs from this tool are engineering screening estimates. Final equipment sizing, and any construction or permit submission, must be confirmed against the manufacturer’s verified performance curves and the applicable local regulation (e.g., Vietnam QCVN 14 / Indonesia PERMENLHK 68).
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