2026-10-15 · Professional procurement

Lamella Raw-Water Clarifiers: Polymer Bid Requirements

Request polymer trial evidence that matches lamella clarification hydraulics, sludge withdrawal and available flocculation time.

A polymer bid for a lamella raw-water clarifier should describe the installed hydraulic and solids-removal conditions. A large floc in a beaker does not show that the material will travel through the inlet, separate between plates and leave through the sludge system. The quotation should address the whole duty rather than promising faster settling in isolation.

Provide the relevant equipment information

State the operating flow range, mixing arrangement, available contact time and sludge withdrawal method. Include known short-circuiting, plate fouling or uneven flow observations. A chemical trial should not be used to obscure a mechanical condition that prevents fair evaluation. Ask the equipment supplier which operating constraints must be preserved during testing.

Describe the raw-water range and existing coagulant program. If the plant has more than one source, explain when blends change. A single clear-water sample does not necessarily represent the peak solids period that determines clarification capacity.

Make the trial resemble the process

Compare candidate grades and the incumbent under consistent preparation and dose units. Evaluate the settling behavior within relevant observation times and account for transfer shear where appropriate. Retain a no-polymer comparison if the technical team considers it useful. Avoid allowing one candidate a longer settling period merely because its first result is poor.

Send the equipment and water brief to Xinqi Polymer and use anionic PAM information to discuss possible screening families. The final selection requires testing, and any drinking-water application requires separate evidence of product eligibility before use.

Follow captured solids out of the unit

Record underflow behavior, withdrawal frequency and any tendency for material to accumulate. Clarifier outlet quality should be assessed alongside sludge handling and subsequent filtration. A short improvement can disappear if captured solids cannot be removed at the rate they arrive. Keep measurements aligned in time with flow and chemical settings.

Accept a usable operating window

The bid evaluation should identify the conditions under which the product works, preparation dependencies and signs that trigger review. Price comparisons should use demonstrated commercial-product consumption at comparable outcomes. Ask for an initial controlled supply quantity rather than an unrestricted performance guarantee. Household readers should treat this as background on professional clarification, not as an instruction to imitate a plate-settling process with chemicals at home.

Connect the purchase to the water question

For background, read Water Clarity and Polymer Charge: What the Science Can Show. Professional buyers can send the application, required evidence and planned quantity through the Xinqi product enquiry; household readers should use the domestic guidance rather than request industrial chemicals.