Ozone Re-Circulation Pump

An Ozone Re-circulation Pump is a specialized fluid-handling device designed to circulate water or process liquids through ozonation systems to optimize ozone distribution, mixing, and dissolved ozone contact. By maintaining controlled flow and turbulence through static mixers, venturi injectors, contact tanks, and ozonated water loops, these pumps help ensure that ozone gas is efficiently delivered into and reacted with the liquid phase. Ozone re-circulation pumps are used extensively in municipal and industrial water treatment, wastewater polishing, aquaculture water systems, cooling towers, and food & beverage processing — wherever enhanced oxidation, disinfection, and contaminant removal are objectives.

Because ozone is a strong oxidant, pumps in ozonation systems must be ozone-resistant, corrosion-resistant, and able to handle ozonated water with minimal degradation. Eltech Ozone’s re-circulation pumps are engineered for durability, compatibility with ozone environments, and seamless integration into process control architectures.

Core Technology & Data

Design & Ozone Compatibility

Ozone re-circulation pumps are manufactured using ozone-resistant materials such as:

• • 316 stainless steel for wetted parts
• • PVDF or PTFE-lined casings and impellers
• • EPDM or FKM (Viton) elastomers for seals and O-rings

These materials withstand continuous exposure to ozone gas and ozonated liquids, resisting oxidative degradation that would shorten service life in conventional pumps.

Flow & Pressure Characteristics

Ozone re-circulation pumps are selected based on:

• • Required flow rate (GPM or m³/hr) through ozonation loops
• • System head pressure to push water through injectors, mixers, and contact chambers
• • Duty cycle expectations (continuous vs. intermittent operation)
• • Temperature and water quality conditions

By matching the pump’s performance curve to system demands, operators ensure stable circulation, minimized cavitation, and optimal ozone transfer into the water column.

Integration with Ozonation Components

In a typical ozone system, the re-circulation pump works in concert with:

• • Venturi injectors or static mixers for gas injection and mixing
• • Contact tanks or reactors for required CT value (ozone concentration × contact time)
• • Sensors (ORP, dissolved ozone) feeding control logic
• • PLC/BMS/SCADA control systems for automated dosing and feedback The pump’s role is to maintain consistent flow to optimize ozone–water interaction and support real-time control strategies

Control & Automation Features

Modern re-circulation pumps may include:

• • Variable Frequency Drives (VFDs) for adjustable flow control
• • Flow sensors and feedback loops for consistent delivery
• • Overload protection and dry-run prevention
• • Remote interfacing for integrated system control

These features help maintain efficient operation, reduced energy use, and protection against system anomalies.

Benefits & Performance Highlights

1. 1. Enhanced Ozone Distribution
   Re-circulation pumps maintain even circulation through ozonation loops, improving how ozone mixes and dissolves in the water, which increases the effectiveness of oxidation and disinfection.
2. 2. Improved Oxidation Efficiency
   Consistent flow through mixers and contact tanks elevates mass transfer of ozone into the liquid, leading to better contaminant breakdown, microbial inactivation, and overall water quality outcomes.
3. 3. Ozone-Resistant Construction
   Constructed from materials such as 316 SS, PVDF, and ozone-compatible elastomers, these pumps survive in ozone environments with minimal corrosion and long service life, reducing maintenance and replacement costs.
4. 4. Versatile System Integration
   Ozone re-circulation pumps integrate with:
   
   • • Venturi injectors and static mixers
   • • Ozone contact chambers/tanks
   • • Sensors and automated controls

   ...making them suitable for municipal water plants, industrial process loops, and customized treatment systems.

5. 5. Precision Flow Control
   

   With options like VFDs and feedback sensors, pumps deliver precise flow regulation critical for tuning dissolved ozone levels, achieving target CT values, and responding to process variations.

6. 6. Operational Reliability
   

   Designed for continuous duty and robust performance, these pumps support 24/7 ozonation cycles with reliable bearings, seals, and corrosion-resistant wetted parts.

7. 7. Energy & Cost Efficiency
   Efficient pump selection and control (e.g., VFD modulation) can reduce power consumption, lower system stress, and minimize operating costs — especially in recirculation-heavy ozonation systems.
8. 8. Safety & System Protection
   With integrated protections (dry-run cutoff, thermal overload, pressure monitoring), ozone re-circulation pumps help safeguard equipment and downstream components against damage due to cavitation, blockages, or electrical faults.

⚠️Important Safety Consideration:
Ozone re-circulation pumps should be installed with proper backflow prevention, pressure relief, and check valves to prevent reverse flow or system damage. Off-gas from mixing and contact zones should be captured or destructed to avoid ozone exposure in occupied areas.

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