Screen
Rotating drum screens take out fibres, grit and anything over half a millimetre before it reaches the tanks.
- Mesh
- 0.5 mm wedge wire
- Removes
- Coarse solids, fibres
Settle
A lamella clarifier lets the heavy fraction drop out. Sludge goes to a press. The water moves on, still grey.
- Plates
- 55° lamella pack
- Removes
- Settleable solids
Filter
Ultrafiltration membranes with 0.02 µm pores hold back what settling missed: fine solids, oils, most bacteria.
- Pore size
- 0.02 µm hollow fibre
- Removes
- Fines, oils, bacteria
Polish
Reverse osmosis and UV bring it to process grade: water your boilers, rinse lines and cooling towers will take.
- Outlet
- < 1 NTU, logged every 60 s
- Returns
- To the line
The plant · Reuse skid R1
Four stages on one skid, beside your line.
Under the water you saw each stage in section. Out of the water it is one machine on a 12.2 m frame: it takes the water your line sends to drain, treats it in four stages and returns it to the line, with a reading at the outlet every 60 seconds.
- Footprint
- 12.2 × 2.4m
- Daily flow
- 50 to 400m³ a day
- Returned to the line
- Up to 80% by volume
- Outlet
- Under 1NTU
- Power
- 1.2kWh per m³
- Tie-ins
- 2one in, one out
- 01 · Day 1
Site survey
An engineer walks your line, samples the water and reads a week of your meters.
- 02 · Weeks 2 to 5
Pilot
A pilot skid runs on your own water for four weeks. You see the figures before you commit.
- 03 · Two days
Connect
The full skid arrives on a flatbed and ties in at two points, one in and one out.
- 04 · Every 60 s
Logged
Turbidity, flow and pressure are logged at the outlet, in readings your auditors can check.
Pilot figures · First site
What comes back to the line.
80%
of process water returned, by volume
6weeks
from the site survey to the first litre back
31%
off the site's mains water bill in the first quarter
0.10NTU
at the outlet, logged every 60 seconds
Who it is for
Lines that run on water.
Food and drink
Clean-in-place rinses and bottle wash, treated and sent back to the wash.
Reuses · CIP and rinse waterTextiles
Rinse water from the dye house, clear enough to rinse the next batch.
Reuses · Rinse after dyeingMetal finishing
Plating rinse lines, with the metals held back for recovery.
Reuses · Plating rinseCooling water
Tower blowdown, treated and returned as make-up water.
Reuses · Blowdown
Company
Tarn is an engineering company in Sheffield. We build one machine: a reuse plant that fits beside a production line. A factory should not have to buy the same water twice.
About Tarn