How do we assess antifoam efficiency ?
Quality of an antifoam is given by two main characteristics :
• Knockdown ability or shock effect :Meaning the speed to destroy an existing foam.
• Persistence or durability : Meaning the efficiency over time.
These two parameters can be assessed by several tests. The main test is the bubbling method. A graduated column with a glass frit in the bottom is required. Foaming water is poured in the column and air at constant flowrate is introduced through the glass frit in the column. Foam is generated by the air and starts to travel up the column. At a determined level of foam, antifoam is injected. By this method several antifoaming agents can be tested.
A graph reporting foam height vs time is very helpful to establish the knockdown ability and the 
persistence for each product. The selected antifoam is the product with the best compromise between shock effect and durability
Environmental performance
Silicone antifoams are essentially composed of polydimethylsiloxane (PDMS) and silica. Silica is a natural element which can be found in sand. PDMS is a strictly inert compound. Studies have proved that PDMS does not interfere with any other compound in a sewage plant. Because of its insolubility in water, PDMS has a low COD and BOD*
.
It does not undergo any chemical reaction in the treatment process. PDMS has a very high ability to
adsorb on sludge and therefore most of the injected PDMS is attached to the sludge. Later sludge is
disposed to land and abiotic degradation of the PDMS occurs. Carbon dioxide, water and silicon dioxide are the only three products generated in this reaction.
Any remaining small amount of PDMS (analytical detection limit) tends to bind to solid particles suspended in the process water phase. These solid particles settle and PDMS is again subject to abiotic degradation as previously mentioned.
• COD : Chemical Oxygen Demand
• BOD : Biological Oxygen Demand
https://www.linkedin.com/company/china-defoamer
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