ODM Osmosis-Assisted Reverse Osmosis System for High Salinity Wastewater Concentration - China Suppliers & Factory Factory, Manufacturers
Product Description
In the field of high salinity wastewater treatment, conventional reverse osmosis has long faced a hard technical barrier: when feed TDS exceeds about 75 g/L , the osmotic pressure difference across the membrane forces operating pressure to approach – or even exceed – the safe limits of membrane elements. The traditional solution is to switch to thermal processes such as multi effect evaporation or mechanical vapor recompression (MVR), but thermal concentration consumes over 20 kWh/m³, accounting for up to 80% of the operating cost of a zero liquid discharge ( ZLD) system.
OARO fundamentally changes this situation . It cleverly integrates reverse osmosis and forward osmosis principles by introducing a saline draw solution on the permeate side to actively reduce the transmembrane osmotic pressure difference. This keeps the net driving pressure across the membrane within a safe and economical range. This mechanism allows the system to concentrate 3 5 g/L brine to 125 g/L with an energy consumption as low as 4 kWh/m³, or push brine concentration to the saturation level of 250,000–260,000 ppm under conventional 70 bar pressure. Compared to traditional ZLD routes, OARO can reduce the thermal evaporation/crystallization load by more than 60% and lower total system costs by up to 60%.
Core Process Flow
High salinity wastewater (the feed solution) is pressurised and enters the high pressure side of the OARO membrane element, while a low concentration salt solution (the draw solution, typically prepared by dil uting a portion of the system’s own concentrate) flows on the permeate side. Under the applied driving pressure, water molecules migrate from the high pressure side to the low pressure side, the feed concentration continuously increases, and the draw solution is gradually diluted. The diluted draw solution can be either recycled back as fresh draw solution or further desalinated by a downstream RO unit to recover fresh water. Through multi stage counter current series connection, the system can approach salt saturation in a cascading manner.
Application Fields
Specific scenarios: ZLD front ‑end membrane concentration for coal chemicals, power plant desulfurization, chemical industrial park high‑salinity wastewater.
Specific scenarios: Shale gas fracturing flow back fluid, oil & gas produced water deep treatment.
Specific scenarios: Lithium/potassium extraction from salt lake brines, mineral recovery from seawater desalination concentrate.
Specific scenarios: Deep concentration & resource recovery from RO seawater desalination brine.
Specific scenarios: Salt separation from textile, pharmaceutical, electroplating, etc.
Specific scenarios: Volume reduction of concentrate from existing RO systems.
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Frequently Asked Questions
OARO uses a saline draw solution on the permeate side to reduce the net osmotic pressure, allowing higher concentration levels than standard RO.
It can consume as little as 4 kWh/m³, significantly lower than thermal processes which often exceed 20 kWh/m³.
Used in ZLD systems, lithium extraction, oil & gas produced water treatment, and seawater desalination.
Yes, it can push concentration to near-saturation levels of 250,000–260 ,000 ppm.
Yes, OARO is excellent for re-concentrating RO reject to reduce the load on existing evaporators.
