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Fresh water resources are very precious to us, but there are far from enough fresh water resources on earth, so we need to desalinize seawater. Seawater desalination refers to the process of removing excess salt and minerals in water to obtain fresh water. There are two main methods: distillation and reverse osmosis. However, foam is often generated in the process of seawater desalination, which will lead to the increase in desalination costs and the decrease in work efficiency. Therefore,the seawater desalination defoamer is indispensable in the seawater desalination process.

Hazards of foam in seawater desalination:

1. Too much foam will slow down the desalination process, increase the complexity of desalination and increase the cost.

2. The existence of foam will affect the quality of desalinated fresh water, making the desalinated seawater residual harmful substances, which cannot be used for drinking.

3. The foam in the seawater desalination process contains toxic substances, and the spread of too much foam will cause secondary pollution wherever the foam goes.

Causes of foam in seawater desalination:

1. There are many kinds of microorganisms in seawater. They will decompose various minerals in seawater and carry out metabolism. In the process of seawater desalination, the change of living conditions of microorganisms will accelerate their metabolism and produce a large amount of foam.

2. In the process of seawater desalination water treatment, some chemical reagents need to be added, and their reaction will produce a large number of fine foams.

3. When the dissolved oxygen is insufficient and the system is running at low load, it is easy to produce denitrification foam.

4. The change of pH value will cause the inadaptability of activated sludge, resulting in foam phenomenon.

Fresh water resources are very precious, so in the process of desalinating seawater, the hard-won fresh water cannot be affected by foam. Seawater desalination defoamer can be directly added to the seawater that needs to be desalinated and it must be stirred evenly before use. The recommended dosage is 0.1% to 0.17%，and the specific dosage needs to be determined according to the actual situation.