In which of the water recycling stages, does biological oxidation process is involved?

Secondary treatment

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Primary treatment

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None of the above

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Tertiary treatment

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Solution

The correct option is A Secondary treatment
Water recycling stages:
Primary treatment(physical):
- Sedimentation (heavy solids) - Floatation (oil, grease, lighter solids)
- Filtration
Secondary treatment(biological) - Biological oxidation (biodegradable dissolved organic matter) - Sedimentation (biological solids)
- Filtration
Tertiary treatment (physio-chemical):
- (nitrogen, phosphorus, suspended solids, heavy metals)
- Disinfection (chlorination 5-15mg/l)

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