CE Certification China Suppliers Factory Deoxygenation Membrane Equipment for Physical Degassing of Water to ppb Levels Suppliers, Manufacturers
Product Description
⚙️ Working Principle
The core working principle of the deoxygenation membrane equipment is based on Henry's Law and the gas-liquid mass transfer process. Henry's Law states that at a constant temperature, the equilibrium concentration of a dissolved gas in a liquid is directly proportional to the partial pressure of that gas in the gas phase.
The equipment uses a hydrophobic microporous hollow fiber membrane as the gas-liquid contact interface, creating a dissolved oxygen concentration gradient across the membrane that drives oxygen molecules to migrate from the liquid phase to the gas phase.
The membrane material is selected from hydrophobic polymers such as polypropylene (PP) or polyvinylidene fluoride (PVDF). The pore size ranges from 0.01 to 0.1 micrometers. The hydrophobic nature prevents water from penetrating the pores, while gas molecules can freely pass through.
🔄 Operation Modes
🌀 Vacuum Deoxygenation Mode
A vacuum pump creates a negative pressure environment on the gas phase side, bringing oxygen partial pressure close to zero. Driven by the partial pressure difference, oxygen molecules pass through the membrane pores. In this mode, outlet dissolved oxygen concentration can be reduced to below 1 μg/L.
💨 Nitrogen Sweep Mode
High-purity nitrogen (≥ 99.999%) is introduced as a sweep gas to maintain extremely low oxygen partial pressure. Dissolved oxygen passes through the membrane into the gas phase and is discharged. In this mode, outlet concentration can be reduced to below 5 μg/L.
Operating Conditions: The equipment operates within a temperature range of 5 to 40°C, with an inlet water pressure range of 0.1 to 0.5 MPa.
🧩 Equipment Structure & Core Components
The equipment consists of a membrane contactor unit, a vacuum or sweep gas system, and piping/control systems. The membrane contactor is the core, internally packed with hollow fiber membrane bundles potted with epoxy resin in a stainless steel or plastic housing.
- Liquid Phase Side: Inlet and outlet for water flow.
- Gas Phase Side: Vacuum port or sweep gas inlet/outlet.
- Vacuum System: Liquid-ring or rotary vane vacuum pump.
- Control System: PLC with flow valves, pressure gauges, and online DO monitors.
🔀 System Process Flow
The system is typically connected in series after RO or EDI modules. For requirements below 5 ppb, a two-stage process is used: stage one uses vacuum, and stage two combines nitrogen sweep with vacuum.
Inlet Water Quality Requirements: Turbidity
🏭 Application Fields
- Ultrapure water for electronics & semiconductors.
- Boiler makeup water in power and heating.
- Water for injection in the pharmaceutical industry.
- Food & beverage production to delay oxidation.
- Petrochemical water injection systems.
- Laboratory analysis and precision cleaning.
📦 Other Products
Modular Seawater Desalination
High-Salinity ZLD System
OEM Precision Manufacturing
ODM Full Value Chain
Water Reuse Equipment
Physical Degassing System
✉️ Send Inquiry
❓ Frequently Asked Questions
Membrane deoxygenation operates at room temperature, saving significant energy. It is more compact, requires no chemical additives, and can achieve much lower dissolved oxygen levels (down to 1 ppb).
Vacuum mode is ideal for achieving the lowest oxygen levels (
Maintenance primarily involves ensuring high-quality inlet water (low turbidity and no chlorine) to prevent fouling. Periodic cleaning and monitoring of vacuum levels and DO concentration are recommended.
Yes, the equipment is widely used in the pharmaceutical industry for deoxygenating purified water and WFI, as it meets strict purity standards without adding chemicals.
Yes, the system is equipped with a PLC control system that uses PID algorithms to automatically adjust vacuum frequency and gas flow based on real-time DO monitoring.
