If the sludge in a clarifier becomes too thick, what action should the operator take?

When sludge in a clarifier becomes too thick, increasing the wasting rate is the appropriate action for the operator to take. This process, known as "wasting," involves removing excess sludge from the system to maintain optimal operational conditions. By increasing the wasting rate, the operator effectively lowers the concentration of sludge, ensuring that it does not become overly dense, which could lead to problems such as reduced settling efficiency and increased likelihood of odor or collection issues.

This intervention helps maintain the right balance of biomass within the system, supporting effective treatment processes and preventing potential operational challenges that arise from thickened sludge. Operators must manage sludge levels carefully because an adequate balance of solids is crucial for optimal clarifier function and overall plant performance.