An MBBR tank description does not identify the carrier supply or complete the treatment scope. For an enquiry referencing BOKAWATER BK-SA1402, request the actual media schedule and interface drawings with the proposal. This checklist organizes purchasing decisions; it does not establish the item's treatment capacity, a recommended fill percentage or compatibility with another supplier's media.
1. Make the carrier quantity and its calculation basis explicit
Veolia describes MBBR with biofilm growing on carriers. Ask the designer to identify each biological zone, its operating water volume and the proposed carrier product. Record media manufacturer, exact designation, material, dimensions and the definition behind any claimed surface area. Keep the biological design basis with the relevant influent load, temperature and treatment target rather than accepting an isolated surface-area number as proof of capacity.
Require the quantity in a defined purchasing unit and explain how any fill fraction is calculated. As hypothetical arithmetic only, an assumed 10 m³ working zone multiplied by a declared 40% carrier-volume ratio gives 4 m³ on that declared volume basis. This is not a BK-SA1402 configuration or recommended ratio. Ask how the supplier measures delivered quantity and distinguishes its bulk-volume convention from liquid displacement; agree initial supply, any later addition and who approves changes.
2. Review retention, movement and solids separation separately
Mark the proposed carrier-retention arrangement on the drawing and identify every relevant outlet, transfer, overflow and drain. For any retaining screen, request its opening geometry, materials, supports, access and the designer's hydraulic review at the agreed flow cases. Confirm how the chosen media and openings are reviewed together, how inspection is performed safely and who supplies each part. Do not infer interchangeability from a carrier's appearance or nominal size.
Ask how the actual aeration or mixing arrangement supports the proposed operating modes and how movement will be checked under the approved commissioning plan. Veolia's overview distinguishes the biological process from downstream surplus-biomass separation. Therefore identify the proposed solids-separation stage, sludge route, monitoring and responsible contractor explicitly. Carrier retention and final effluent verification answer different purchasing questions; a screen label does not demonstrate complete suspended-solids removal or discharge compliance.
3. Reconcile delivered media and close the operating handover
Before delivery agree the documents needed to reconcile the order: carrier identification, quantity measurement, batch or shipment record, component drawings and inspection scope. At receipt retain package labels, condition photographs and discrepancies. Changes of media type, quantity or screen detail should have an identified reviewer and written disposition. An inventory check confirms supply; it does not establish biological treatment performance.
Request an operating handover describing inspection points, approved maintenance methods, access restrictions and the response to an abnormal water level, damaged retention part or suspected media loss. Assign who reviews observations and authorizes corrective work. Keep the accepted carrier inventory, drawings and commissioning findings with the effluent acceptance plan and any open items. Send this worksheet with the water analysis and loading profile so media, retention hardware, aeration, solids handling and site work are explicitly included or excluded in the quotation.
Data to collect before comparing proposals
| Parameter / interface | Unit / format | Why it matters |
|---|---|---|
| Purchasing decision | Evidence to request | Question to close |
| Biological zone | Working water volume and design load | Which duty supports the proposal? |
| Carrier identity | Manufacturer, product, dimensions and material | What exact media is offered? |
| Quantity basis | Unit, fill definition and delivery measurement | Are the order and receipt comparable? |
| Surface-area claim | Definition and model-specific evidence | Is the stated basis clear? |
| Retention arrangement | All relevant exits and retaining details | Who reviews the complete route? |
| Screens where proposed | Openings, supports, hydraulics and access | Has the media/interface combination been reviewed? |
| Aeration or mixing | Operating modes and approved observations | How is movement checked? |
| Downstream solids | Separation stage, sludge route and owner | What remains outside the carrier zone? |
| Handover | Inventory, drawings, maintenance and exceptions | Who accepts changes and closes open items? |
Technical references
- Veolia Water Technologies — AnoxKaldnes MBBR technology overview ↗Source checked:
Evidence scope — original English record
Overview describes biofilm on suspended carriers and distinguishes downstream surplus-biomass separation. General process context only. Veolia media, patents, cases and ratings are not BOKAWATER evidence. Quantity, retention and inspection questions below are original procurement guidance, not a supplier specification.
- BOKAWATER — Integrated MBBR sewage equipment, item BK-SA1402 ↗Source checked:
Evidence scope — original English record
Existing item identity only. Mixed generic equipment fields do not verify a sewage capacity, installed carrier, fill percentage, screen geometry or certification. These details require a configuration-specific proposal.