What is the stated goal regarding sludge and BOD removal?

• A. Maximum sludge production
• B. Maintain constant sludge
• C. The least amount of sludge, while removing the most BOD
• D. Minimize BOD removal

Answer: (C)

In wastewater treatment, the aim is to remove organic matter efficiently while keeping sludge production manageable. The stated goal is to produce as little sludge as possible while removing as much BOD as possible. This reflects the practical balance: high BOD removal improves effluent quality, but sludge generation adds substantial handling and disposal costs. Producing maximum sludge would waste resources, while maintaining constant sludge or minimizing BOD removal would not meet treatment objectives.