Most lamella installations that underperform were not badly made. They were badly installed: a pack out of level, a support beam that deflects, modules that float when the basin is filled. This is the sequence that avoids all three.
Also searched as: tube settler media installation · lamella media installation procedure · how to install tube settler modules · inclined plate media commissioning
| Basin clean and dry | Construction debris under the pack will bridge the channels. Clean before, not after |
| Support beams checked | Level within a working tolerance across the whole footprint, and checked against the module load. Published geometry assumes a supported pack, not a suspended one |
| Inlet distribution | Energy dissipation and flow distribution are set before the media. A pack cannot correct an inlet that jets into one corner |
| Access | A route for modules to reach the basin edge, and a plan for the last row - it is always the row that gets improvised |
Modules are 1000 × 500 × 1000 mm and are installed at 60° to the horizontal. Work from one end and keep the courses square: a pack that runs out of square at the far wall has to be cut, and cut modules are the ones that fail later.
Three checks during stacking, each cheap and each worth doing:
Level of each course. A course that sits 10 mm high loads the course above it unevenly, and the pack settles unevenly once it is full of water.
Channel alignment. The 60° channels should line up across module joints. Misalignment at joints is where sludge accumulates first, and it is invisible until the plant underperforms.
Fixing against uplift. An empty module is buoyant; a flooded basin tries to lift the pack. Whatever the fixing detail is - strapping, weights, hold-downs - it is installed as the pack goes up, not afterwards, because afterwards there is no access.
Fill slowly, from below the pack where possible, so the modules are wetted evenly and the trapped air escapes. Then run at low flow first and watch the outlet rather than the inlet: solids appearing at the outlet at low flow mean the pack is bypassing, not that the media is wrong.
| Channel velocity check | Confirm the flow is inside the published 2.5–3.0 mm/s band. Above it the flow is no longer laminar and adding media will not recover it |
| Loading check | Confirm the surface loading against the published 3–5 t/m²·h band, using the actual basin area rather than the drawing |
| Sludge draw-off | Confirm the sludge is actually leaving the hopper. Media that works and a hopper that does not is the most common cause of "the media is not performing" |
| Level survey after fill | Re-survey the top of the pack once the basin is full. Movement here is the early warning for a support problem |
Product data and module schedule: tube settler media · inclined plate media · technical details · retrofitting an existing basin.
It depends on the volume and the access, not on the media: a basin that can be reached by crane at the edge goes far faster than one where modules are carried through a manhole. Plan on the module count per shift rather than a days-per-cubic-metre figure, and confirm it with your contractor before the delivery date.
Yes, but cut modules must be re-fixed and de-burred, and the cut face is a weak point. Set the module layout so that cutting is confined to a single edge row, and keep the cut modules documented so a later replacement matches.
Yes. An empty module floats and a full basin will lift a pack that is not restrained. The fixing detail is part of the installation, not an accessory, and it has to be installed as the courses go up because there is no access afterwards.
A pack installed out of level on beams that were not checked for deflection. It looks correct when dry and settles unevenly once loaded, and by then the basin is full and the modules are inaccessible.
Module schedule, fixing detail and the commissioning checklist, in one document you can hand to the contractor.
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