Seawater desalination (RO) wastewater treatment system

Seawater desalination (RO) wastewater treatment system

The system draws water from the ocean, where suspended solids and microorganisms are removed by the pre-treatment unit. Then, the seawater is pressurized by a high-pressure pump and sent into the RO membrane system. The semi-permeable membrane separates the fresh water from the salt.

Produced water (fresh water): Through the RO membrane, the salt removal rate can reach over 99.4%

Concentrated brine (RO wastewater): The salinity significantly increases while maintaining a certain pressure

After the produced water undergoes post-treatment (pH adjustment, addition of minerals, and disinfection), it can meet the standards for drinking water or process water; the concentrated brine can be directly discharged into the sea in accordance with project requirements or enter the subsequent high-salt wastewater deep treatment system (such as evaporation crystallization, near-zero discharge system, etc.).

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Working principle
Other cases
FAQ

Working principle

The seawater desalination RO wastewater treatment system draws seawater from the ocean and first passes it through pre‑treatment, where multi‑media or ultrafiltration units and cartridge filters remove suspended solids, colloids and microorganisms while dosing systems add coagulant and antiscalant. A high‑pressure pump then feeds the conditioned seawater into reverse osmosis membranes, producing low‑salinity permeate and high‑salinity brine. An energy recovery device captures pressure from the brine and returns it to the feed stream via a booster pump, reducing power consumption. Finally, post‑treatment adjusts pH, remineralizes and disinfects the permeate, while the concentrate is safely discharged or sent to further treatment.
Key Features & Advantages

·High salt rejection rate (up to 99.4% for seawater RO membranes)
·Optimized energy consumption with high‑efficiency HPP and ERD
·Modular skid‑mounted design for fast installation and easy expansion
·Robust anti‑corrosion materials (FRP, duplex / super duplex stainless steel, titanium as required)
·Intelligent PLC control system with online monitoring (flow, pressure, conductivity, pH, ORP)
·Automatic chemical cleaning (CIP) and backwash of pre‑filters
·Tailored RO wastewater (brine) management options: discharge, dilution, or advanced treatment
·Designed to comply with international standards and local environmental regulations
Applications

·Coastal power plants and combined cycle plants
·Islands and remote coastal communities
·Offshore platforms and FPSO units
·Petrochemical, refinery and industrial parks
·Hotels and resorts in coastal / island areas
·Any project requiring both seawater desalination and RO wastewater (brine) management
Why Choose Us?

·Extensive experience in seawater RO and high‑salinity wastewater treatment
·Customized design based on feed water analysis and local discharge standards
·Proven, compact layout as shown in our reference project photos
·Full technical support, from design and installation to operation & maintenance
·Optional integration with MVR evaporation or ZLD systems for projects with strict discharge limits

Other cases

Domestic sewage treatment

Wastewater treatment of Thermal Power PlantIndustry: Environmental protection industryProcess: Coarse Grate + Fine Grate + Sedimentation Tank + Hydrolysis and Acidification Tank + A2/O + Advanced Treatment + Ultraviolet DisinfectionTreatment Capacity: 350 T/D

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Treatment of concentrated liquid

Industry: Environmental protection industryProcess: Chemical softening and hardness removal + DTRO reverse osmosis membrane concentration + MVR evaporation + spiral reverse osmosisTreatment capacity: 120 tons per day

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High-salt wastewater treatment

Industry: Chemical IndustryProcess: Adjustment tank + High-speed sedimentation tank + V-shaped filter + UF + NF + RO + Evaporation and crystallizationTreatment capacity: 200T/D

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Four-effect evaporation system

Evaporation capacity: 30 T/HMaterial: Malt syrupFinal concentration: 80%Main material: SS316L

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Sodium chloride crystallization system diagram

Evaporation capacity: 5.4T/HMaterial: Sodium chlorideFinal concentration: CrystallizationMain material: TA2

Learn More >

FAQ

What is a seawater desalination RO wastewater treatment system?
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It is an integrated plant that converts seawater into fresh water using reverse osmosis (RO) and safely treats or disposes of the high‑salinity RO brine (wastewater) according to environmental standards.
What type of feed water can this system handle?
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The system is designed for open‑sea or coastal seawater with TDS typically between 30,000 and 45,000 mg/L. With proper pre‑treatment, it can adapt to different turbidity and seasonal variations.
How is the RO brine (wastewater) treated or discharged?
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The concentrated brine can be discharged to the sea via diffusers, blended with other low‑salinity streams for dilution, or connected to downstream high‑salinity treatment units such as evaporation, crystallization or ZLD systems.
Can the system be customized for different capacities?
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Yes. The seawater RO wastewater treatment system can be engineered from small containerized units to large‑scale plants, based on required capacity, feed water quality and local discharge regulations.
What maintenance is required for reliable operation?
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Regular replacement of cartridge filters, periodic backwash of pre‑filters, scheduled chemical cleaning (CIP) of RO membranes and routine inspection of pumps, valves and instruments ensure stable, long‑term performance.

Hainan Yongtuo Win-Win International Technology Co., Ltd.

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