Question

A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as?
A.primary treatment
B.tertiary treatment
C.activated sludge treatment
D.none of these

Answer 1

Hint: Almost all commercially available bacterial mixtures contain only a mixture of Bacillus. Bacillus is an excellent treatment agent for bacteria in wastewater, but it is most suitable for treating oils, fats, oils and proteins. This is why they are mainly used in wastewater treatment plants.

Complete answer:
Primary treatment: The primary treatment of wastewater involves the precipitation of solid waste in water. This is done after filtering out the larger pollutants in the water. The wastewater passes through several tanks and filters to separate the water from the contaminants. The resulting "sludge" is then sent to the digester, where it is further processed. This first batch of sludge contains nearly suspended solids in wastewater.
Tertiary treatment: The main purpose of the tertiary treatment is to ensure that the treated water to be released into the environment is biologically accepted by all other freshwater organisms (such as weeds and algae). Another physical method commonly used in sewage treatment systems is filtration.
 Activated sludge treatment: Many sludge’s are treated using a variety of digestion techniques, the purpose of which is to reduce the amount of organic matter and the number of pathogenic microorganisms present in the solids. The most common treatment methods include anaerobic digestion, aerobic digestion and composting. The activated sludge process in wastewater treatment involves blowing oxygen or air into untreated untreated sewage. This process crushes the solids. The sewage is bubbled and discharged into the activated sludge chamber.

Hence the correct answer is OPTION(C)

Note: Activated sludge treatment involves the decomposition of organic matter through sewage fungi and decomposing bacteria through aeration in an oxidation tank. This aeration helps the oxidation of sludge.