Which of the following is a common problem with air strippers?

Calcium carbonate precipitation from CO2 is indeed a common problem encountered with air strippers. As air strips volatile compounds from wastewater, it can also strip certain gases, such as carbon dioxide (CO2). When CO2 is removed from the water, it decreases the acidity of the solution. This change in pH can lead to the precipitation of calcium carbonate, especially in waters that have a higher hardness or significant calcium concentrations. The precipitation can cause scaling and blockages within the air stripper system, thereby reducing its efficiency and requiring maintenance.

In the context of air stripper operation, the precipitation of calcium carbonate is significant because it can disrupt the facility's performance and lead to increased operational costs due to the need for regular cleaning and potential replacement of components affected by scaling. Understanding this process is essential for wastewater treatment operators to maintain effective removal of contaminants while managing the side effects of air stripping technology.