CE Certification High-Pressure Membrane Concentration System Suppliers and Factory in China - DTRO & STRO Technology Suppliers, Manufacturers
Product Description
Our Solution
Shanghai Tongjie Environmental Protection's high-salt wastewater reduction and resource recovery system employs a combined process of OARO (Optical Advanced Reverse Osmosis) for high-salt concentration, DTRO (Dialysis-Treated Reverse Osmosis) for high-pressure reverse osmosis, and MVR (Membrane Vapor Recovery) for evaporation and crystallization.
The raw water has a TDS concentration of 10,000–50,000 ppm, which is concentrated to over 150,000 ppm TDS, achieving zero wastewater discharge and salt resource recovery. Adapted for high-salt industries such as chemical engineering, electroplating, lithium salts, coal chemical industry, pharmaceuticals, and printing and dyeing.
Core Advantages
When wastewater TDS exceeds tens of thousands mg/L and COD remains high, conventional reverse osmosis membrane elements quickly fail due to concentration polarization and membrane fouling. System recovery drops sharply, cleaning cycles shorten to just a few days, and evaporation/crystallization costs remain prohibitive.
DTRO (Disc-Tube Reverse Osmosis) and STRO (Spiral Tube Reverse Osmosis) are specialized high-pressure membrane technologies engineered for extreme conditions. Both share open-channel flow path designs and high-pressure operation capabilities, achieving high-ratio concentration and stable permeate production that conventional membranes cannot reach.
Standard Process Flow
Raw water → Pretreatment (sand filter/UF) → Primary DTRO membrane modules → Recirculation → Permeate → UV disinfection → Reuse/discharge; Concentrate → Secondary DTRO → Evaporation/crystallization or resource recovery.
Raw water → Softening/UF → Primary RO concentration → Secondary RO concentration → STRO superconcentration → Permeate reuse → High-density brine → Evaporation/crystallization.
Application Scenarios
DTRO’s 3.0 mm wide channel design and open flow paths allow high turbidity, high SS feed to pass without clogging. At feed TDS up to 25,000 mg/L, recovery stays at 75–90% with continuous operation for 12 months without irreversible fouling.
STRO concentrates TDS from 30,000 mg/L to 80,000 mg/L, reducing power consumption by 0.72 kWh/m³ compared to evaporation, cutting operating costs by 60%.
DTRO can directly treat high hardness, high salinity wastewater without softening, offering significantly better operational stability than conventional processes.
Coupled with nanofiltration salt separation, sodium chloride and sodium sulfate can be recovered as industrial-grade by-products, achieving "pollution control coupled with profit generation."
Suitable for ship/naval vessel desalination, offshore platforms, and mine water treatment where high pressure tolerance and compact modular design are required.
Other Products
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High-Salinity Wastewater ZLD System
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Frequently Asked Questions
The system is designed to treat raw water with TDS concentrations between 10,000–50,000 ppm and can concentrate it to over 150,000 ppm TDS for effective resource recovery.
DTRO and STRO feature open-channel flow designs and high-pressure capabilities. Unlike conventional RO, they resist fouling and clogging even with high turbidity and high COD levels.
Yes, by combining OARO/DTRO/STRO concentration with MVR evaporation and crystallization, the system achieves full wastewater volume reduction and ZLD.
Absolutely. The DTRO system is specifically engineered for landfill leachate, handling high ammonia nitrogen and fluctuating salinity with stable flux and high recovery rates.
Industries such as electroplating, pharmaceuticals, coal chemicals, and lithium salt production can recover industrial-grade salts like sodium chloride and sodium sulfate.
Due to the anti-fouling design, our DTRO systems can operate continuously for up to 12 months without irreversible fouling in many landfill leachate applications.
