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प्रश्न
Explain the role of microbes in sewage treatment.
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उत्तर
Microbes play a significant role during secondary and tertiary sewage treatment.
- During secondary treatment, primary effluent is continuously agitated in a large tank due to which vigorous growth of useful aerobic microbes into flocs takes place. These microbes consume major part of the organic matter in the effluent as they grow. Due to this, BOD of the effluent is significantly reduced.
- During tertiary treatment, bacterial flocs are allowed to sediment. Small part of it is passed back into the aeration tank and a large part is pumped into large tanks called anaerobic sludge digesters. These anaerobic bacteria digest the bacteria and fungi in sludge.
- Thus, use of microbes in sewage treatment helps to remove organic matter from waste water before it is discharged in water bodies like rivers.
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संबंधित प्रश्न
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
Which of the following is/are found in discharge from industrial waste?
______ refers to the organic matter which settles down after physical treatment of sewage.
After which of the following treatment BOD of the effluent is significantly reduced?
Nitrogen fixation by organisms requires conditions that are:
During sewage, treatment biogas is produced wits which include:
In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
In what way anaerobic sludge digestion is important in sewage treatments?
The aeration tank of a sewage treatment plant is not functioning properly. Explain in detail the impact of this on the treatment of sewage and BOD of the effluent.
