Galex X730 Specified for Low-Head Aeration Duty in Dairy Effluent Treatment

Axion One X730

Galex has specified the Axion One X730 for biological aeration in dairy effluent treatment, a duty shaped by shallow basins and by an organic load that moves with production and cleaning cycles.

Aeration typically accounts for around half the electricity consumed at a wastewater treatment facility. In dairy processing the biological stage runs continuously, so small differences in blower performance are multiplied across every operating hour of the year.

Basin depth sets the duty. At diffuser submergence of around two metres, static head is roughly 20 kPa; adding diffuser and pipework losses puts the operating point in the low twenties. The X730 is rated at 7.5 kW, with a rated discharge pressure of 30 kPa and a maximum of 38 kPa. It is sized for the duty rather than over-specified against it, with the margin covering diffuser fouling and peak load rather than unused capacity. As a low-head machine by design, it is not intended for deep-tank service.

Because that pressure demand sits well inside the normal operating range of positive-displacement machines, the comparison does not turn on pressure capability. It turns on part-load behaviour. Dairy effluent reaches the biological stage in batches, following cleaning cycles and production runs, so oxygen demand swings across the day. A fixed-speed machine answers a moving load with constant output, and the surplus is throttled or vented.

The X730 carries an integrated variable-frequency drive, so output follows demand instead of holding a fixed duty point, and shaft power falls with speed. Its oil-free, contact-free design removes gearboxes, belts and lubrication from the maintenance schedule, leaving filter replacement as the principal routine task — a factor where the biological stage cannot be taken offline. The unit covers duties previously handled by blowers of roughly twice its rating.

Integrated support for the full 485-Modbus sensor range allows dissolved-oxygen feedback to drive output directly, removing the lag between a load change and the blower response.

Galex supplies the Axion One range for effluent treatment, sewage treatment and river rehabilitation.