Short-circuiting affects a clarifier's _______.

• A. Capacity
• B. Temperature
• C. Sludge production
• D. Efficiency

Answer: (D)

Short-circuiting in a clarifier creates a bypass path where part of the incoming flow moves through the tank with little residence in the settling zone. This reduces the time and opportunity for suspended solids to settle, so solids remain suspended and exit with the clarified water. The net effect is a drop in removal efficiency. Capacity, temperature, and sludge production aren’t directly governed by this flow pattern: capacity is about design volume and throughflow rate, temperature is influenced by mixing and heat transfer, and sludge production hinges on biological activity and solids loading. So the main impact of short-circuiting is reduced efficiency.