EVERYDAY SCIENCE

Detailed explanation-1: -The second step is called flocculation, in which larger particles called flocc form after coagulation. Sedimentation occurs next when the heavy flocc settles to the bottom and is cleared away.

Detailed explanation-2: -Flocs are masses of essential bacteria associated with fungal filaments to form a mesh-like structure. They are in a sludge structure. They help in increased aerobic decomposition as well as filament help in trapping particles when they are put in the secondary sewage tank.

Detailed explanation-3: -Coagulation and flocculation are two separate processes, used in succession, to overcome the forces stabilising the suspended particles. While coagulation neutralises the charges on the particles, flocculation enables them to bind together, making them bigger, so that they can be more easily separated from the liquid.

Detailed explanation-4: -It is sludge formed during primary sewage treatment. It is sludge formed during secondary sewage treatment. It possesses flocs of decomposer microbes.