Explain why the treatment of wastewater is essential for protecting aquatic life, describing the roles of primary, secondary and tertiary treatments.
Answer
Treating wastewater prevents harmful substances from entering water bodies, protects aquatic life, reduces disease, and allows reuse. Primary treatment removes solids, secondary biologically degrades organic matter, tertiary further removes nutrients and pathogens.
Step-by-step solution
- State the overall importance of treating wastewater for aquatic life protection.
- Explain primary treatment: removal of suspended solids by settling or screening.
- Explain secondary treatment: biological degradation of dissolved organics using microorganisms.
- Explain tertiary treatment: further removal of nutrients, pathogens and polishing of effluent.
- Summarise how each stage reduces harmful impact on ecosystems.
Common mistake: Overlooking the role of tertiary treatment in nutrient removal
Concept tested: Importance of wastewater treatment
Published · How this solution was prepared and checked
← All Wastewater Story questions