Foam is generated by surface active agents, present in the wastewater or formed due to biological action. Formation of foam requires three ingredients: (1) gas bubbles; (2) surfactants, either synthetic or produced by biological action; and (3) hydrophobic particles, which can be organic solids, bacteria, etc. Some foam forming bacteria are also pathogens. Presence of foam on the surface of the water retards oxygen transfer, thereby creating anaerobic conditions, which can increase the production of odors and hence gas bubbles.
With the use of Non-Active Biocatalysts as OrTec, no foam is generated and the aerobic conditions are maintained.
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