Recirculating pumps provide the liquid motive power and are chosen to suit the characteristics of the fluid and the venturi. Pumps are normally centrifugal type and are either submersible or drywell mounted. The standard motor power for the self-entraining single venturi option is 7.5kW, but will depend upon the application. Multi-venturi systems with single larger pumps are also available.
The ability of the standard Transvac Venturi Aerator to self-entrain air at liquid depths up to 6.5m ensures flexibility over the vast majority of applications. At greater liquid depths efficient operation is still achieved by employing higher pressure pumps or blown air. To accommodate deep process vessels (or unusually high oxygen demands) a Transvac ‘Forced Air Aerator’ has been developed utilising a mechanical blower. High energy efficient aeration and mixing can be achieved in the deepest of vessels (a particular advantage when space is at a premium).
Standard self-aspirating units can operate at tank depths of up to 7 metres and offer typical efficiencies between 1.2 and 1.8 kg02/kWh at standard conditions. High alpha factors, simplicity, reliability and low cost make the Transvac Venturi Aerator very competitive with other forms of aeration equipment on the market.
The action of the Venturi Aerator makes it particularly suited to processes that require directional mixing, such as in ‘race-track’ type oxidation ditches or in-line aeration packaged sewage treatment plants.
Corrosion resistant materials are available where necessary, making our Aerators ideal for mixing applications in hazardous/aggressive liquid or effluent.
The oxygen transfer feature of the Transvac Mixer / Aerator is used to it’s full on food waste balance tank mixing because it can keep the effluent ‘fresh’, avoiding unpleasant odours.