Seawater Desalination
High-recovery RO systems with energy recovery devices for coastal cities, islands, and offshore projects facing freshwater scarcity.
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Project-ready membrane systems
Reliable RO & UF Systems for Industrial Water Treatment
Engineered RO, UF, and desalination systems for global EPC contractors, distributors, and industrial buyers. Full export documentation and customized skid designs.
OEM/ODMRO/UF SystemsSeawater DesalinationExport Ready
Since 2010 — 15+ YearsStable Operation
10,000 m²Manufacturing Facility
60+In-House Technical Engineers
5,000+Global Project Cases
Exported to 48+ Countries(USA, KSA, UAE, Chile...)
About QJ Water
Not Just a Factory — Your Project-Ready Water Partner
QJ Water Treatment (Xi'an Qianjing Environmental Protection Co., Ltd) delivers custom-engineered membrane systems for global B2B projects. We bridge Chinese manufacturing efficiency with strict international compliance — supporting you from feed water analysis and process design, through skid fabrication and export-standard packing, to remote commissioning guidance.
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Solutions by industry
Water Treatment Solutions Built for Real-World Challenges
We don't just sell equipment — we design process flows that solve specific water quality problems across industries and geographies.
Brackish Water Treatment
Effective TDS and hardness reduction for agricultural irrigation, rural water supply, and industrial process feed in high-salinity regions.
Learn MoreWastewater Reuse & Recycling
Integrated pretreatment, UF, RO, and disinfection trains to meet strict environmental discharge or in-plant water reuse standards.
Learn MoreIndustrial & Commercial Process Water
Reliable ultrapure, boiler feed, and general process water for power plants, pharmaceuticals, electronics, hotels, and beverage facilities.
Learn MoreProduct categories
Complete Product Portfolio — 9 Water Treatment Categories
Engineered for performance and built to last. We provide customized, superior-quality equipment tailored to your exact project specifications.
Membrane & Pure Water Systems
Reverse Osmosis System
Industrial RO for desalination, boiler feed, and process water.
- Capacity: 0.5 ~ 500 TPH (Custom engineered)
- TDS Tolerance: Up to 45,000 ppm (Seawater)
- Material: SS304 / SS316L / Epoxy-coated Carbon Steel
Membrane & Pure Water Systems
Ultrafiltration System
UF membranes for turbidity, colloids, and bacteria reduction.
- Pore Size: 0.01 ~ 0.1 Microns
- Configuration: Inside-out / Outside-in options
- Application: RO pretreatment or direct supply
Membrane & Pure Water Systems
Ultrapure Water Equipment
RO + EDI + Mixed Bed + Polishing for high-purity needs.
- Resistivity: Up to 18.2 MΩ·cm
- Integration: RO, EDI, and MB skids
- Application: Electronics, pharma, and labs
Desalination & Water Reuse
Seawater Desalination Equipment
High-pressure systems with energy recovery for coastal projects.
- Energy Recovery: PX / Turbo Charger options
- Materials: Super Duplex / FRP corrosion-resistant
- Recovery Rate: Up to 45%
Desalination & Water Reuse
Brackish Water Treatment Equipment
Effective TDS reduction for groundwater and high-salt sources.
- Feed TDS: 1,000 ~ 10,000 ppm
- Recovery Rate: 70% ~ 85%
- Automation: PLC auto-run with remote monitoring
Desalination & Water Reuse
Wastewater Treatment Equipment
Integrated treatment trains for industrial effluent reuse.
- Process: Pretreatment + UF + RO + Dosing
- Compliance: Meets international discharge standards
- Customization: Skid or containerized layout
Pretreatment, Disinfection & Accessories
Filtration Equipment (Pretreatment)
Media filters, carbon filters, cartridge filters, and softeners.
- Media Types: Sand, Activated Carbon, Anthracite
- Filtration: Down to 5 Microns (Cartridge)
- Automation: Manual or fully automatic valves
Pretreatment, Disinfection & Accessories
Disinfection Equipment
Chemical dosing, UV, ozone, and sodium hypochlorite generators.
- UV: Low-pressure / Medium-pressure lamps
- Ozone: Corona discharge / Electrolysis
- Dosing: Accurate metering pumps with PLC control
Pretreatment, Disinfection & Accessories
Membranes & Accessories
RO/UF membranes, filters, resins, valves, and consumables.
- Membranes: Brackish / Seawater / Low-energy types
- Resins: Cation / Anion / Mixed Bed
- Compatibility: Fits major brands (DOW, Hydranautics, etc.)
OEM / ODM customization
How We Customize Your Water Treatment System
Whether you are a distributor, EPC contractor, or end-user, follow our transparent 5-step OEM process.
- 01
Submit Water Analysis & Project Brief
— (Tell us capacity, source water, target quality)
- 02
Process Design & Quotation
— (Get P&ID drawings and formal quote within 48 hours)
- 03
Confirm Customization Details
— (Voltage, control logic, skid layout, private label)
- 04
Production & Factory Testing
— (Strict QC and hydrostatic testing before shipment)
- 05
Export Packing & Shipping Support
— (Seaworthy packing with full customs documents)
Project cases
Global Project References
See how our systems perform in real-world installations across different countries and industries.
Boiler feed water
Xi'an, Shaanxi, China
Boiler Demineralized Water System
UF, RO and EDI deliver stable high-purity water for municipal heating boilers.
- Process: UF + RO + EDI
- Application: Municipal heating / boiler feed
- Output: High-purity demineralized water
- Advantage: Automatic and stable operation
- Service: Design, supply and commissioning
Chemical wastewater reuse
Heilongjiang, China
Chemical Plant ZLD Water Reuse System
A high-recovery treatment train converts saline wastewater into reusable process water.
- Process: UF + two-stage RO + EDI
- Goal: ZLD and water recovery
- Application: High-salinity chemical wastewater
- Advantage: Anti-fouling, low operating cost
- Benefit: Less discharge, resource recovery
Remote drinking water supply
Tibet, China
Plateau Border Station Drinking Water System
A turnkey drinking-water system engineered for high altitude, extreme cold and unstable power.
- Environment: High altitude / extreme cold
- Users: Border posts / remote bases
- Design: Freeze-, low-temp- and surge-resistant
- Output: Standard-compliant drinking water
- Delivery: Survey-to-installation turnkey service
Industrial water reuse project
United Arab Emirates
Textile Factory Wastewater Reuse
Integrated treatment recovers dyeing wastewater for safe in-plant reuse.
- Industry: Textile dyeing
- Process: Pretreatment + membrane + dosing + disinfection
- Goal: Industrial wastewater reuse
- Benefit: Lower fresh-water use and discharge
Municipal and island water supply
Hainan, China
Municipal Seawater Desalination
Pretreatment and RO provide reliable municipal water for coastal and island communities.
- Type: Municipal / island water supply
- Source: Seawater
- Process: Pretreatment + RO desalination
- Advantage: Modular, corrosion-resistant, low energy
- Application: Coastal cities and islands
Remote cold-region water supply
Russia
Custom Containerized RO System
An insulated containerized RO package built for fast deployment in remote cold regions.
- Delivery: Containerized / skid-mounted
- Process: Custom RO system
- Climate: Freeze protection and insulation
- Installation: High integration, rapid setup
- Application: Remote, emergency and overseas supply
Committed to Excellence
ISO 9001
ISO 14001
CE
EAC
High-Tech Enterprise
FAQ
Frequently Asked Questions
Find answers about system customization, quotation requirements, and spare parts support.
Have a project-specific question? Contact our team.
Are you a water treatment equipment manufacturer?
Yes. QJ Water Treatment is positioned as a manufacturer and OEM/ODM solution provider for industrial and commercial water treatment equipment.
Can you provide OEM or ODM water treatment systems?
Yes. We can support customized capacity, skid layout, control cabinet, voltage, instrument selection, documentation and private label requirements.
What information is needed for a quotation?
Please provide water source, water analysis if available, required capacity, daily operation hours, target water quality, application and destination country.
Can RO systems be integrated with pretreatment equipment?
Yes. RO systems can be integrated with multimedia filters, activated carbon filters, water softeners, cartridge filters, antiscalant dosing, UV sterilizers and CIP systems.
Do you supply membranes and spare parts?
Yes. We can supply RO membranes, UF membranes, PP filter cartridges, resin, filter media, UV lamps, seals, gauges and common water treatment spare parts.