Which statement best describes the role of backwash water in operation?

• A. Backwash water should be treated to remove solids before discharge, in line with policy and regulations.
• B. Backwash water should always be discharged directly without treatment.
• C. Backwash water is used as drinking water after simple filtration.
• D. Backwash water has no impact on treatment plant operations.

Answer: (A)

Backwash water is the wastewater produced when a filter is cleaned. It carries the solids and fines that were trapped in the filter media, plus any material sloughed off during backwashing. Because this water contains suspended solids and possibly contaminants, it must be treated or managed before discharge to protect the environment and to meet regulator and plant policy requirements. That’s why the best choice says it should be treated to remove solids prior to discharge, in line with policy and regulations. The other ideas don’t fit: backwash water isn’t suitable for drinking after simple filtration, it’s not normally discharged directly without treatment, and it does affect how the plant operates by needing proper handling of the waste stream.