Features:
The purpose of the Tesca Aeration Apparatus is to permit the study of the oxygen  transfer characteristics of diffused air systems and the physical and chemical parameters that  influence their oxygenation capacity. These studies are a necessary prelude to the understanding  of the biological treatment of wastewaters. 
 
Tesca Aeration Apparatus comprises an open tank equipped with a propeller  stirrer. Air is supplied via a compressed air line through a pressure regulator valve, and through a  flow meter to a diffuser positioned within the tank. A variety of diffusers are included. The dissolved  oxygen content of the water in the tank is measured by means of a dissolved oxygen probe, which  includes a direct reading of water temperature. 

Mounted on the base is the clear 27-liter acrylic water tank. On the front of the tank is a depth scale  and at the base a drainage tap. The digital stirrer control includes speed and torque measurements.  This is supported by a metal bar. Three diffusers – sparger tube, treble airstone, and single airstone  – may be separately attached to the aerator tube.  
Variable-speed adjustment of the stirrer paddle provides different levels of turbulence in the tank.  

Specifications:
Tank capacity: 27l  
Flow meter range: 0-10 l/min  
Oxygen/temperature meter ranges: -5 to 199%DO2  
 - 5 to 25.0%DO2  
 - 5 to 19.99mg/l  
 - 10 to 105°C  
Oxygen probe length: 300mm  
Chemicals required: Sodium sulfite, (not supplied) cobaltous chloride 

Experiments:
Effects of oxygen transfer under non-steady-state conditions  
Measurement of the absorption coefficient Ks and the oxygenation capacity R  
The effect on Ks and R of:  
- Degree of fluid mixing  
- Water temperature  
- Gas flow rate  
- Depth of water 
- Diffuser arrangement  
- Water composition

Recommended Instruments:
Stop clock  
Triple-beam top-loading balance  
100ml measuring cylinder  
Compressed airline or compressor

Requirements:
Mains Power 220 – 240V 1Ph, 50Hz 
Water Supply