Specify where the polymer will be used
A food-processing purchase should distinguish wastewater DAF treatment from dewatering the collected solids. These stages can have different feed and preparation requirements. State the intended injection point, existing coagulant and the actual separator, together with the product currently used.
Report oil or fat, suspended solids, pH and relevant plant analyses. Explain how production losses, washdown and cleaning chemicals affect the feed. Organic content often warrants cationic screening, but residual coagulant and wastewater chemistry can change the outcome; a food-industry label does not prove which grade to buy.
Agree the water and float endpoints
Define acceptable treated-water quality alongside the float’s handling characteristics. A clear sample is incomplete evidence if the collected float becomes difficult to scrape, store or dewater. Keep solids capture and disposal implications in the comparison instead of judging only visible floc size.
Review coagulant dose and sequence before ranking the polymer. Document pH at the treatment point and the relevant flotation conditions. The DAF selection guide explains the operating context; the purchasing brief should specify which result is expected from the proposed PAM.
Represent both production and cleaning feed
Use representative samples from more than one condition where the duty varies. Compare a controlled dose curve with stable preparation, rather than changing coagulant and polymer simultaneously after every upset. Note where a candidate loses performance or creates a narrow adjustment window.
Move promising candidates to the actual DAF while monitoring feed and machine conditions. Bench tests screen chemistry but do not fully reproduce bubble attachment or the installed flow arrangement. Record polymer consumption over representative stable periods so a supplier quote can be compared against a credible treatment requirement.
Keep the application scope clear
Give the test record to Xinqi Polymer technical sales and request identified samples with preparation guidance. The local cationic product route and cationic PAM reference provide family context for the discussion.
A chemical used in a food factory’s wastewater system is not automatically approved for food contact or potable-water treatment. State the actual duty and ask for any application-specific documentation required by the buyer. Do not infer those approvals from the factory’s industry or a generic PAM specification.
Connect technical approval to commercial supply
Retain the accepted code, supplied form, trial conditions and consumption basis. Confirm quantity, packaging and destination separately from the treatment target. Include product-specific storage instructions and receiving documents in the final request, particularly if the plant has intermittent production.
Use the RFQ checklist to collect those details and recheck the baseline after a significant cleaning or production change. A successful purchase supports stable water quality and manageable float across the agreed operating range, while commercial availability and delivery timing require an order-specific supplier response.
Include float handling in candidate approval
Suppose a DAF trial reaches the water target but produces a float that the plant cannot handle reliably. Review float loading, the scraping arrangement and chemical conditions before deciding whether the issue belongs to the polymer. Preserve the observations so procurement can see whether accepting the candidate would introduce a downstream operating burden.
Repeat the final comparison across representative production and cleaning periods. Identify which endpoints remain stable and which require adjustment. The accepted code should support the complete wastewater duty stated in the RFQ. A reference to a food-processing application must stay connected to wastewater treatment and should not be interpreted as an approval for direct food contact.
| Review point | Evidence to retain |
|---|---|
| Feed | Fats, solids and cleaning variation |
| DAF | Coagulant and flotation conditions recorded |
| Result | Water quality and float handling reviewed |