Question 8: What is the key difference between primary and secondary sewage treatment?
Class 12 - Biology - Microbes in Human Welfare Page 189
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76
Primary sewage treatment
Secondary sewage treatment
1.
It is a physical method of treatment
It is a biological method of treatment
2.
It involves in removal of large particles and floating materials such as leaves, papers, rags, solids such as sand, grit and oily substances
It involves the removal of fine suspended and dissolved organic matter.
3.
It makes the used of sedimentation and filtration process
It makes the use of aerobic or anaerobic biological units
4.
It is relatively simple and less time consuming process
It is relatively complex and takes a long time for its completion
Answered by
19
Primary treatment is a mechanical process which involves screening and settling of large particals.
Secondary treatment is a biological process in which the organic matter in sludge is broken down with the help of bacteria
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