Advertisements
Advertisements
Question
Explain the steps involved in preliminary treatment of sewage.
Advertisements
Solution
- Screening: Sewage and waste water contain plenty of suspended, floating materials, coarse, and solid particles, along with dissolved substances. The suspended objects are filtered and removed. This is done in screening chambers. The sewage is passed through screens or net in the chambers. Larger suspended or floating objects are held in the screening chambers. These have to be removed before the biological treatment.
- Grit Chamber: After screening, the filtered sewage is then passed into a series of grit chambers. These chambers contain large stones (pebbles) and brick-ballast. Coarse particles settle down by gravity. Thus, passage of filtered sewage removes much of the coarse particulate matter.
APPEARS IN
RELATED QUESTIONS
Answer the following question.
Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.
Rearrange the names of tanks used in sewage treatment as per the flow of the procedure.
- Settling tank
- Grit Chamber
- Aeration tanks
- Primary sedimentation tank.
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Which of the following is put into Anaerobic sludge disaster for further sewage treatment?
In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?
Study the given diagram of the Sewage Treatment Plant (S.T.P.) and answer the question that follows:
- Which one of the two 'S.T.P.' (A) or (B) will be more effective in treating the human excreta in municipal waste?
- Write the steps followed in carrying the treatment of the sewage in step (Z), once the BOD of sewage is reduced significantly till it is passed on to the "anaerobic sludge digesters".
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.
During primary sewage treatment, floating debris is separated by which physical process?
In a sewage treatment plant, grit comprising soil and small pebbles is removed during which stage and process?
Which action plans were initiated by the Ministry of Environment and Forests to construct sewage treatment plants and protect major Indian rivers from pollution?
