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8. What is the key difference between primary and secondary sewage treatment?
Answers (1)
The differences between the primary and secondary treatment of sewage are as follows:
| Primary sewage treatment | Secondary sewage treatment |
| Primary sewage treatment is a mechanical process that removes solid waste materials | Secondary sewage treatment is a biological process in which waste materials are enzymatically treated by bacteria and other microbes |
| It is a less expensive and simple process | It is an expensive and complicated process |
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