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Lenntech can design, build and commission reverse osmosis (RO) systems treating different kinds of water sources ranging from tapwater, brackish water to seawater desalination and covering all types of applications including drinking water, irrigation water and process water.

Lenntech provides pre-engineered as well as custom designed turnkey plants covering several flows. The systems can be skid mounted and containerized. Capacities above 100 m³/h usually require multiple skids.

Model reference	Flow
LT-RO1-htec-5	2-5 m³/h
LT-RO1-htec-10	5-10 m³/h
LT-RO1-htec-20	10-20 m³/h
LT-RO1-htec-40	20-40 m³/h
LT-RO1-htec-60	40-60 m³/h
LT-RO1-htec-100	60-100 m³/h

When a higher removal of salts is required a double-pass RO can be implemented, where the permeate of the first pass RO is treated in a second RO system.

Model reference	Flow
LT-RO2-htec-5	2-5 m³/h
LT-RO2-htec-10	5-10 m³/h
LT-RO2-htec-20	10-20 m³/h
LT-RO2-htec-40	20-40 m³/h
LT-RO2-htec-60	40-60 m³/h
LT-RO2-htec-100	60-100 m³/h

Please check Reference projects for detailed information on Lenntech running plants.

Large size BWRO plant < 70 m3/h

SWRO large plants < 100 m3/h

Smaller capacity systems:

Compact BWRO plant < 500L/h

Small size BWRO plant < 1500L/h

Medium size BWRO plant < 3500 L/h

SWRO small plants < 2 m3/h

LennRO Systems

An innovative RO technology offered by Lenntech deviating from the traditional RO configuration is the Desalitech Closed Circuit Reverse Osmosis (CCRO). This is used when high recovery is needed.

In most cases, an RO plant must be preceded by a proper pre-treatment to avoid membrane fouling/scaling by sediments, hardness, organic matter, bacteria, silica, metal oxides or even chlorine.

RO permeate water is often more acidic than the feed water due to dissolved carbon dioxide. Common post-treatment are pH neuralisation and remineralisation.

When an additional polishing step is required after the RO treatment to reach extra pure water quality Electrodeionization (EDI) and Ion exchange (IX) can be added as treatment steps.

General design data for Reverse Osmosis Plants:

	TWRO Tap water	BWRO Brackish water	SWRO Sea water
Salinity	< 1500 ppm	< 8000 ppm	< 35000-45000 ppm
Recovery	80%	65-80%	35-45%
Working pressure	< 15 bar	< 15-25 bar	50-75 bar
Membrane types	Tap / Brackish 4" or 8"		Seawater 4" or 8"
Flux	30-35 l/h.m²	25-30 l/h.m²	15-20 l/h.m²
Specific energy at 25°C	< 0.75 kWh / m³	< 1.5 kWh / m³	< 5 kWh / m³ with energy recovery
Configuration	Skid mounted or containerized 10 to 40 ft