Choose a DAF machine manufacturer by asking each supplier to demonstrate that its proposed system can handle the same wastewater, flow variation and discharge target. A headline flow rate or removal percentage is not enough. The useful comparison is the tested design basis, complete supply scope, whole-life cost and a written acceptance procedure.
Prepare one enquiry package for every manufacturer
Provide average and peak hourly flow, daily operating hours, production and cleaning cycles, temperature, pH, TSS, oil and grease, and total and soluble COD. Include sampling dates and laboratory methods. Identify the receiving sewer or water body and the actual permit target. If production changes the wastewater, identify the conditions behind each sample rather than combining them into one reassuring average.
For an initial equipment discussion, review the existing DAF machine range. Use the system sizing guide to organise the enquiry, then require the supplier to confirm its calculations for your site.
Compare evidence, not unverified supplier rankings
| Comparison item | Evidence to request | Reason to pause |
|---|---|---|
| Hydraulic and solids capacity | Feed and recycle flows, loading calculations, effective area and test conditions | Only a catalogue flow is supplied |
| Chemical conditioning | Jar/flotation trial, pH, product dose and sludge yield | A removal guarantee has no chemical or influent conditions |
| Construction and layout | Material grade, dimensions, service clearances, connections and installation drawing | Material or maintenance access is unspecified |
| Operating cost | Connected and running loads, duty hours, chemical usage and sludge production | Only an unsupported cost per cubic metre is quoted |
| Commercial delivery | Named contracting entity, warranty, spares, training and commissioning scope | Local support or exclusions cannot be identified |
For example, P-TEC's published model tables distinguish dimensions and effective area and warn that high solids loading can reduce capacity. Those are useful questions for any supplier; the tables do not establish a like-for-like ranking against another manufacturer.
What belongs in the quotation?
Separate the flotation vessel, recycle/air system, feed pumps, flocculation, chemical dosing, controls and sludge handling. State whether civil works, freight, duties, installation, testing, electrical connection and operator training are included. Ask for the measured or estimated operating input behind each recurring cost. The existing DAF energy guide is a starting checklist, not a substitute for the selected equipment duty schedule.
Check certification documents against the legal entity, scope and validity period. A quality-management certificate is not proof that a particular wastewater will meet a permit. The manufacturer certification guide can help organise document requests; verify the documents themselves.
Write the acceptance test before placing an order
- Agree the influent range, flow envelope, chemical conditions and equipment included in the guarantee.
- Specify inlet and outlet sampling locations, methods, laboratory, test duration and how abnormal production is handled.
- Measure the required outlet concentration and load as well as removal percentage, power, chemicals and sludge.
- Agree who corrects a failed test, the retest procedure and the contractual remedy.
Questions buyers ask
Which DAF manufacturer is best?
The one that can document the required duty, acceptance terms and support for your application. This page does not rank suppliers using unverified prices or efficiencies.
Can DAF treat dissolved pollution?
Do not assume flotation removes a dissolved contaminant. Test the wastewater and determine whether conditioning, biological treatment or another process is needed alongside solids separation.
Can I buy on the lowest equipment price?
Only after equalising supply scope and recurring costs. A cheaper vessel can leave pumps, dosing, installation or sludge disposal outside the comparison.
