Ohio Sanitarian Practice Exam

The presence of aluminum in water treatment plant effluent serves as an important indicator of filtration efficiency. Aluminum is often used as a coagulant in the flocculation process during water treatment. It is primarily used to help aggregate and settle out suspended particles in the water, which is crucial for effective filtration. If aluminum levels in the effluent are within acceptable limits, it suggests that the coagulation and filtration processes are functioning effectively, allowing for the successful removal of particulates and contaminants. High levels of aluminum, on the other hand, can indicate insufficient removal processes, pointing to potential issues with the filtration system’s performance.

The other elements listed do not serve as direct indicators of filtration efficiency. Copper, zinc, and lead can be present in water for various reasons, including corrosion of pipes or contamination, but they do not relate to the specific processes of coagulation and filtration like aluminum does. Consequently, monitoring aluminum levels provides critical insight into the effectiveness of the filtration system in maintaining water quality.