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Question
Which of the following in sewage treatment removes suspended solids?
Which of the following in sewage treatment removes suspended solids?
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Solution
The correct option is C Primary treatment
Sewage is the municipal wastewater generated in cities and towns which needs to be treated in sewage treatment plants (STPs) before being released into water bodies.
Sewage treatment is done in 2 major stages
• primary treatment
• secondary treatment
Primary treatment of sewage involves physical removal of the particles in the sewage. This involves filtering out the floating debris in sewage by passing it through several filters of varying pore sizes. The filtrate is then allowed to sit undisturbed in large sedimentation tanks where the heavier stones and pebbles, etc. settle down or sediment as primary sludge under the influence of gravity.
Therefore primary sewage treatment removes suspended solids.
The clear fluid collected above is called the primary effluent. The primary effluent is subjected to secondary treatment.
During the secondary treatment, the primary effluent is passed into huge aeration tanks where it is continuously agitated (disturbed) by stirring and pumping it with air. This leads to the rapid growth of heterotrophic aerobic microbes into flocs (masses of bacteria and filamentous fungi) that digest the organic wastes present in the sewage and degrade it.
After the secondary treatment, the effluent is passed through a large settling tank where the microbial flocs settle down. This sediment is called activated sludge. The effluent from the secondary treatment is released into water bodies.
The effluent produced during the secondary treatment can be further treated chemically by chlorine or ozone, in the tertiary treatment.
The activated sludge is fed into an anaerobic sludge digester tank where anaerobic microbes digest the bacteria and fungi present in it in the absence of oxygen. During this process, gases like methane, carbon dioxide and hydrogen sulphide are released. These form the biogas.
Sewage is the municipal wastewater generated in cities and towns which needs to be treated in sewage treatment plants (STPs) before being released into water bodies.
Sewage treatment is done in 2 major stages
• primary treatment
• secondary treatment
Primary treatment of sewage involves physical removal of the particles in the sewage. This involves filtering out the floating debris in sewage by passing it through several filters of varying pore sizes. The filtrate is then allowed to sit undisturbed in large sedimentation tanks where the heavier stones and pebbles, etc. settle down or sediment as primary sludge under the influence of gravity.
Therefore primary sewage treatment removes suspended solids.
The clear fluid collected above is called the primary effluent. The primary effluent is subjected to secondary treatment.
During the secondary treatment, the primary effluent is passed into huge aeration tanks where it is continuously agitated (disturbed) by stirring and pumping it with air. This leads to the rapid growth of heterotrophic aerobic microbes into flocs (masses of bacteria and filamentous fungi) that digest the organic wastes present in the sewage and degrade it.
After the secondary treatment, the effluent is passed through a large settling tank where the microbial flocs settle down. This sediment is called activated sludge. The effluent from the secondary treatment is released into water bodies.
The effluent produced during the secondary treatment can be further treated chemically by chlorine or ozone, in the tertiary treatment.
The activated sludge is fed into an anaerobic sludge digester tank where anaerobic microbes digest the bacteria and fungi present in it in the absence of oxygen. During this process, gases like methane, carbon dioxide and hydrogen sulphide are released. These form the biogas.
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