CE Certification Osmosis-Assisted Reverse Osmosis Factory, Suppliers
Product Description
Core Features
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 35 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
Application Fields
Zero Liquid Discharge (ZLD)
Technical value: Concentrates brine to near‑saturation, dramatically reducing evaporation/crystallization load and significantly lowering full‑cycle system operating cost. Gradiant’s CFRO+OARO combination achieves up to 99% water recovery and up to 60% lower total system cost.
Oil & Gas Produced Water
Technical value: OARO effectively treats produced water with high TDS, organics, and complex salts. With three‑stage pre-treatment, membrane flux loss can be reduced from 20% to <2%. The concentrated brine facilitates subsequent salt recovery, and treated water can be reused for fracturing fluid preparation or industrial water.
Lithium Extraction & Salt Recovery
Technical value: OARO concentrates low‑grade brines to saturation, creating ideal conditions for subsequent lithium/potassium selective precipitation or membrane separation. Aquatech integrates OARO with lithium processing, brine mining, and other processes to recover critical minerals from high‑salinity waste streams.
Seawater Desalination Concentrate
Technical value: The concentrate discharged from conventional RO desalination has a TDS about twice that of seawater (approx. 70 g/L), posing ecological risks if discharged directly. OARO can further concentrate such brine to >250,000 ppm, dramatically reducing discharge volume and recovering valuable salts such as NaCl for the chlor‑alkali industry.
Industrial Wastewater Salt Recovery
Technical value: OARO concentrates NaCl, Na₂SO₄, etc., in wastewater to saturation. Combined with nanofiltration salt separation or crystallisation, salts are recovered by fraction. In the textile industry, OARO has been validated to recover high‑purity salt from wastewater for reuse in dyeing processes; the recovered salt directly offsets part of the ZLD system’s operating cost.
RO Concentrate Re‑concentration
Technical value: Secondary concentration of RO concentrate (TDS approx. 70–80 g/L) to >150 g/L, significantly reducing concentrate disposal volume. This greatly increases the treatment capacity of an existing ZLD system without expanding evaporator capacity.
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Frequently Asked Questions (FAQ)
What is OARO technology and how does it overcome conventional RO limits?
OARO (Osmotically Assisted Reverse Osmosis) integrates reverse osmosis and forward osmosis principles by utilizing a saline draw solution on the permeate side. This reduces the transmembrane osmotic pressure difference, allowing high salinity wastewater to be concentrated beyond traditional reverse osmosis limits under conventional operating pressure.
How much energy can OARO save compared to traditional thermal ZLD routes?
Traditional thermal processes consume over 20 kWh/m³. OARO can concentrate 35 g/L brine up to 125 g/L with energy consumption as low as 4 kWh/m³, reducing the thermal evaporation/crystallization load by more than 60% and total system operating costs by up to 60%.
What concentration levels can be achieved with the OARO system?
Under standard 70 bar operating pressure, OARO systems can push brine concentrations up to near-saturation levels of 250,000 to 260,000 ppm (TDS), making it ideal for downstream mineral recovery and Zero Liquid Discharge (ZLD).
Which industries benefit most from OARO application?
OARO is widely used in coal chemical industries, power plant desulfurization, oil & gas produced water treatment, salt lake lithium extraction, seawater desalination concentrate volume reduction, and textile or pharmaceutical salt recovery systems.
Can OARO be integrated into existing RO wastewater treatment plants?
Yes, OARO can be implemented as a secondary concentration stage for existing RO systems (re-concentrating feed TDS from 70–80 g/L to >150 g/L). This significantly expands treatment capacity without needing extra evaporator installations.
