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Heavily contaminated, variable leachate treated by staged RCDT reverse osmosis, with water analysis and pilot testing first.
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Rotreat · Technology
RCDT: disc tube reverse osmosis for difficult water
Rotreat engineers RCDT, Radial Channel Disc Tube reverse osmosis, for heavily contaminated, variable water streams that standard membrane elements cannot hold. This page explains the technology; the application pages show what it does for each water stream.
Standards & conformity
- AbwV Annex 51 · CSB
- PFAS · drinking-water limit values 2026/2028
- RCDT · Radial Channel Disc Tube
The membrane technology
Open radial flow channels for water a standard element cannot hold
The RCDT technology (Radial Channel Disc Tube) carries the water through open radial flow channels at a high cross-flow velocity. This reduces deposits and fouling and makes the membrane more robust against variable, heavily contaminated influents that would quickly reach the fouling limits of a standard membrane element.
It operates in staged high-pressure concentration, roughly 90 to 160 bar, matched to the recovery target and the concentrate path. Design is based on water analysis first, not a catalogue data sheet, because the influent is rarely stable: conductivity, CSB (chemical oxygen demand), ammonium and trace substances fluctuate.
RCDT 3.0 · the process
From raw water to permeate in 33 seconds
Feed and conditioning, filtration, high pressure, the RCDT stages, concentrate and post-treatment: one plant, one container.
waiting for the frame to come into view
Modelled from the Rotreat RCDT 3.0 plant (brochure 2024), in the drawing language of the home page. The cards show documented facts only, no invented figures.
System overview
From influent through RCDT reverse osmosis to permeate and concentrate
Influent, pre-treatment and staged RCDT high-pressure stages, from contaminated water to permeate and concentrated concentrate.
Application
RCDT reference plants
The central objection, answered honestly: reverse osmosis separates substances and produces concentrate, which needs a dependable route. AbwV Annex 51 (German Wastewater Ordinance, Annex 51) is a relevant assessment framework, but not an automatic assurance of a permit.
600 m³/day design capacity of the Rotreat leachate plant in Galicia, Spain
120 m³/day RCDT plant in Slovenia
170 m³/day RCDT plant in Caras
Where it is used
Landfill leachate and other difficult wastewater
RCDT reverse osmosis is engineered for water streams where standard treatment struggles: high conductivity, high CSB, ammonium and PFAS. Where the influent varies too widely or the loads are biologically driven rather than membrane-limited, Rotreat also builds MBR (membrane bioreactor) systems.
PFAS, honestly placed
Reverse osmosis can separate PFAS from the water stream and concentrate them in the concentrate. It does not destroy PFAS; retention, recovery and the concentrate path belong in a joint assessment.
Contaminated surface water
Where variable rain runoff and biologically driven loads are the issue, Rotreat MBR treatment applies instead of, or alongside, RCDT.
MBR for contaminated surface water
A Rotreat MBR plant treats polluted rain run-off at a waste management site: 380 m³/day, commissioned July 2019, with limit values met since.
Rotreat · membrane exchange
Easy Click: the membrane stack exchanged on site
Vessel off, used stack out, the packaged Easy Click module tilted upright and lowered onto the tie rod, vessel on: exchanged by the operator's own workforce, without special tools, compatible with all disc tube modules.
waiting for the frame to come into view
Modelled from the Rotreat Easy Click module exchange (brochure 2024, presentation 2024), in the drawing language of the home page. The cards show documented facts only, no invented figures.
Rental & emergency plants
Containerised RCDT capacity for temporary and urgent needs
Rotreat RCDT container systems cover temporary capacity and urgent operating needs without waiting for a fixed installation.
Rental system
A containerised system for temporary capacity and changing operating needs: 130 m³/day.
Emergency system
A mobile RCDT system configured for urgent temporary treatment: 150 m³/day, with a 2-day installation time.
Rotreat in other applications
The same membrane technology, proven on other water streams
Landfill leachate
RCDT reverse osmosis for leachate
- Galicia, Spain
- Slovenia
- Bijeljina
Rental & emergency
Plants on site within days
- Rental plant for leachate
- Emergency plant for leachate
Pharmaceutical wastewater
High-strength industrial effluent
- Two pharmaceutical sites in India
MBR
Membrane bioreactor treatment
- Surface water at a waste management site
- Liquid waste treatment
Every entry is a Rotreat plant. Results are project-specific and are not a forecast for another site.
Next step
Ask about your own water stream
The entry point is a paid feasibility study or pilot testing based on your water analysis. Influent values (conductivity, CSB, ammonium), flow rate, the required discharge value and the permitting status are helpful. We clarify any missing values together.
- 1You describe the site, the feed and the discharge requirement.
- 2A specialist assesses your enquiry.
- 3We agree the pilot and the documents with you.
Ask about your water stream
Briefly describe your site, the influent and the trigger. Send us your current water analysis if you have one, otherwise a few details are enough.
Your enquiry is assessed by specialists. Recovery and discharge values are not promised across the board; influent, pre-treatment and the concentrate path remain visible.
Further pages
Landfill leachate reverse osmosis
RCDT reverse osmosis for contaminated leachate, from water analysis to pilot testing.
RCDT references
Galicia, Slovenia and Caras with project-specific measured values.
Rental and emergency systems
Containerised RCDT capacity for temporary and urgent needs.
Smart Match: find the right route
A few questions lead to the right investigation route for your water stream.
Describe your water problem
In a few questions, Smart Match places your situation and shows the most sensible next assessment step for your water system.
Speak to specialists directly
Prefer a conversation to a form? We place your situation technically and name the next assessment step.
Get in touch ›Send in a water analysis
Already have analysis values? Send them to us: we will review them and come back with a first assessment.
Send analysis ›RotreatRCDT reverse osmosis for difficult water.
Ask about your water stream