MCQ
Identify the stage of sewage treatment shown below.


- APrimary treatment
- ✓Secondary treatment
- CTertiary treatment
- DFiltration and sedimentation

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$(1)$ Salt concentration in inland water - $30-35\%$
$(2)$ Salt concentration in the sea - $5\%$
$(3)$ Salt concentration in hypersalinelagoon - $>100\%$