![Secondary sewage treatment is mainly a](https://www.gkseries.com/blog/wp-content/uploads/2022/01/Secondary-sewage-treatment-is-mainly-a.png)
Q. Secondary sewage treatment is mainly a
A. physical process
B. mechanical process
C. chemical process
D. biological process
Answer: biological process
A. physical process
B. mechanical process
C. chemical process
D. biological process
Answer: biological process
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