Production and Treatment of Biological foam
Biological foam and its control foam are common phenomena in the operation of activated sludge process.
There are two types of foam, one is chemical foam and the other is biological foam.
Chemical foam is formed by the detergent in sewage and some industrial surface active substances under the action of aeration and blowing off. In the initial stage of activated sludge cultivation, there are many chemical bubbles, and sometimes foam mountains up to several meters are formed on the surface of the aeration tank. This is mainly because the activated sludge has not yet formed in the initial stage, and all foam-producing substances have formed foam under the action of aeration. With the increase of activated sludge, a large amount of detergent or surface substances will be absorbed and decomposed by microorganisms, and the foam will gradually disappear. In a normal operating activated sludge system, due to some reasons, a large amount of sludge is lost, which leads to a sharp increase in F/M and chemical foam. Chemical foam treatment is easier, you can use water to defoam, or you can add defoamer. The more difficult thing to deal with is biofoam, which is formed by a type of filamentous bacteria called Nocardia. The chemical foam is milky white, while the biological foam is brown.
It can accumulate very high on the aeration tank and enter the secondary settling tank to flow away with the water, causing a series of problems. First of all, the bio-foam spread to the walkway board, making the operator unable to maintain it normally. In addition, bio-foam can freeze in winter, making it extremely difficult to clean up. In summer, bio-foam will drift with the wind and form an unpleasant odor. Nocardia is very likely to become a human pathogen. If surface aeration equipment is used, the biological foam can also prevent normal aeration and oxygenation and reduce the D0 of the mixture. Bio-foam can also enter the mud zone along with the sludge and interfere with the operation of the thickening tank and digestion tank. The bio-foam cannot be washed away with water, and the defoamer has little effect. Because Nocardia is produced inside the activated sludge flocs, trying to use chlorine to solve the problem cannot fundamentally solve the problem. Increasing sludge drainage and lowering SRT sometimes have a slight effect, but it can only remove the part of Nocardia that has a long generation period. The fundamental measure of bio-foam control is to start from the root and focus on prevention.
The K1 Pond Filter Media can effectively prevent the generation of bio-foam from the root.
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