Advertisements
Advertisements
Question
Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) it.
Advertisements
Solution
The effluent from the primary treatment is passed to aeration tanks where air is pumped into it. The useful aerobic microbes grow into flocs (masses of bacteria associated with fungal filaments) and consume the major part of the organic matter in the effluent which reduces BOD of the effluent. The effluent is then passed into a settling tank where bacterial flocs are allowed to sediment. This sediment is called activated sludge.
APPEARS IN
RELATED QUESTIONS
What is sewage?
Answer the following question.
What are 'flocs', formed during secondary treatment of sewage?
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
Due to which of the following reason/s sewage water cannot be discharged directly into river?
Identify the type of microorganisms involved in floe formation during sewage treatment.
After which of the following treatment BOD of the effluent is significantly reduced?
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?
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.
Which of the following statement is correct for Sewage Treatment Plants (STPs)?
