Answer :

Flocs are the microbial biomass which gets together to act as a flocculant and causes a process known as flocculation.By this process, the microbial biomass metabolizes the organic waste and thus causes a decrease in the overall Biological Oxygen Demand (i.e., B.O.D) in the water.

Thus, flocs are important in the biological treatment of waste water as they help in reducing theBiological Oxygen Demand (i.e., B.O.D) in the water to make it less polluted and habitable for aquatic animals, reduces the pathogens and digests the organic waste.

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