OEM High-Ratio Water Reuse Equipment from China Suppliers | Factory Solutions for High-Salinity Industrial Wastewater Factories, Manufacturer
Product Description
Process Flow and Principle
After pretreatment and UF, the raw water enters the primary RO unit (brackish water membrane). A portion of the permeate is directly reused, while the primary RO concentrate serves as the feed water for the SWRO unit. The SWRO membrane withstands higher operating pressures and achieves over 99% rejection of both monovalent and divalent ions, further concentrating the salts.
The SWRO concentrate then enters the STRO membrane unit. STRO utilizes open-channel flow paths and high-pressure-resistant membrane elements, with an operating pressure capable of reaching 9 MPa or higher, maintaining stable flux even when treating high-salinity brine. The STRO concentrate can be sent to an evaporation crystallization system or other disposal method.
Through this multi-stage concentration process, the total system recovery rate can be increased to over 85% (depending on raw water quality), significantly reducing the final concentrate volume. Each membrane stage independently controls pressure and recovery. Optional inter-stage energy recovery devices can be added to reduce system operating energy consumption while further increasing the volume of reused water.
Equipment Structure and Core Components
- Pretreatment filters and UF (Ultrafiltration) unit
- Primary RO, SWRO, and STRO high-pressure membrane modules
- Inter-stage booster pumps and optional energy recovery devices
- Comprehensive control cabinet with online conductivity and flow sensors
- Anti-scalant dosing, pH adjustment, and dedicated cleaning systems
The SWRO membrane elements are high-rejection seawater desalination membranes. The STRO uses wide-channel spiral-wound membranes that are fouling-resistant and amenable to chemical cleaning.
Key Performance Indicators and Applicable Standards
✅ The determination of product water quality targets is based on two inputs: (1) current national and industry standards for reclaimed water reuse quality, and (2) the customer's proposed end-use for the product water, downstream process integration requirements, and on-site water source conditions.
✅ Based on the customer's water quality report and volume requirements, the company provides a process scheme and guaranteed performance values covering the above indicators during the design phase. These values are mutually confirmed and used as the acceptance criteria for the equipment.
An ideal solution for meeting short-term or long-term decentralized water supply demands
Application Fields
The equipment is primarily used in desulfurization wastewater, circulating cooling system blowdown, and high-salinity process wastewater from industries such as electric power, petrochemicals, and coal chemicals.
It is also suitable for centralized wastewater treatment plants in industrial parks, reducing the volume of discharged concentrate by increasing the raw water reuse rate, thereby meeting near-zero discharge policy requirements. The process can effectively concentrate leachate, reducing the load on downstream evaporation systems.
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Frequently Asked Questions
Through the multi-stage concentration process (RO + SWRO + STRO), the total system recovery rate can reach over 85%, depending on the specific raw water quality.
It is primarily used for desulfurization wastewater, cooling system blowdown, and high-salinity wastewater in the power, petrochemical, and coal chemical industries.
STRO (Spacer Tube Reverse Osmosis) utilizes open-channel flow paths and high-pressure-resistant elements (up to 9 MPa), making it highly resistant to fouling when treating high-salinity brine.
Yes, by significantly reducing the volume of concentrate and increasing the reuse rate, it minimizes discharge and reduces the load on downstream evaporation systems.
Yes, optional inter-stage energy recovery devices can be integrated to reduce overall operating energy consumption and improve cost-efficiency.
Quality targets are customized based on national reclaimed water standards and the specific requirements of the customer's downstream processes.
