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Question
Wastewater treatment generates a large quantity of sludge, which can be treated by:
Wastewater treatment generates a large quantity of sludge, which can be treated by:
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Solution
The correct option is A anaerobic digesters
Activated sludge:
Sewage treatment involves primary and secondary treatment:
- Primary treatment: Physical removal of debris and solid particles.
- Secondary treatment: The primary effluent is aerated allowing the growth of flocs. In the settling tank, the flocs settle down. This sediment is called activated sludge. Some of this sludge is fed back as inoculum into the aeration tank. The rest is pumped into anaerobic digesters.
Flocs:
Flocs are mesh-like structures formed by fungal filaments and bacteria found in the aeration tanks.
Anaerobic sludge digesters:
The activated sludge formed is fed into anaerobic sludge digesters where anaerobic bacteria digest the microbes of the flocs. This process releases a mixture of gases that is used as biogas.
Oxidation ponds:
Oxidation ponds, also known as stabilisation ponds, are used during the secondary treatment of sewage where the organic matter of sewage is oxidised aerobically.
Final answer: a. anaerobic digesters
Activated sludge:
Sewage treatment involves primary and secondary treatment:
- Primary treatment: Physical removal of debris and solid particles.
- Secondary treatment: The primary effluent is aerated allowing the growth of flocs. In the settling tank, the flocs settle down. This sediment is called activated sludge. Some of this sludge is fed back as inoculum into the aeration tank. The rest is pumped into anaerobic digesters.
Flocs:
Flocs are mesh-like structures formed by fungal filaments and bacteria found in the aeration tanks.
Anaerobic sludge digesters:
The activated sludge formed is fed into anaerobic sludge digesters where anaerobic bacteria digest the microbes of the flocs. This process releases a mixture of gases that is used as biogas.
Oxidation ponds:
Oxidation ponds, also known as stabilisation ponds, are used during the secondary treatment of sewage where the organic matter of sewage is oxidised aerobically.
Final answer: a. anaerobic digesters
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