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Overview

Clarifiers are settling tanks used in water and wastewater treatment to separate suspended solids from liquid by gravity. They come in circular or rectangular designs with mechanical scrapers, sludge rakes, and scum removal systems. Clarifiers are essential for primary and secondary treatment stages, controlling solids loading, and producing clearer effluent before further treatment or discharge.

FAQ

What should I check when buying a used clarifier?

Inspect tank shell and floor for corrosion, cracks, or repairs; check scraper arms, bearings, gearboxes, and drive motors; review maintenance records and solids handling history; confirm dimensions, capacity, and weir type to match your flow.

How are clarifiers typically shipped?

Large tanks or complete units may require disassembly and transport on lowboys or flatbeds. Remove or secure scraper arms, drives, and electric panels. Verify lifting points, overall dimensions, and local permits before booking transport.

What site preparation is needed for installation?

Prepare a reinforced concrete foundation or ringwall with anchor bolts and level bearing surface. Provide electrical supply, access platforms, piping tie-ins, and adequate crane access for reassembly and alignment.

What regular maintenance should I plan for?

Daily visual checks for leaks and unusual noises; weekly scraper and weir inspections; monthly gearbox oil checks and bearing greasing; annual full inspection of structure, welds, drives, and sludge removal system.

Which spare parts wear out fastest?

Wear items include scraper seals, bearing kits, sprockets/chains, gearbox components, drive couplings, weir seals, and level sensors. Keep common spares on hand to minimize downtime.

How do I verify clarifier performance before purchase?

Request recent operational data: influent/effluent TSS, overflow rate (gpd/ft2 or m3/m2·day), sludge blanket behavior, and run a site demonstration or third-party inspection if possible.