Which of the following is a treatment process for algae control?

The use of copper sulfate as a treatment process for algae control is effective due to its properties as an algaecide. When applied to water bodies, copper sulfate targets algal cells, disrupting their metabolism and ultimately leading to their death. This method is particularly useful in treating blooms of blue-green algae (cyanobacteria) and can help restore water quality by reducing oxygen depletion and toxin production associated with algal blooms.

Copper sulfate acts quickly and can be an efficient means to manage algae, especially in situations where the growth is excessive and poses hazards to water quality for recreational or drinking purposes. However, its use must be carefully monitored, as excessive application can lead to toxic effects on aquatic life.

In contrast, the other methods listed have different applications. Filtration is primarily a physical barrier method for removing particulates and organisms from water rather than directly targeting algae. Flocculation involves the aggregation of particles, which can assist in removing suspended solids, but is not specific to algae. Ozonation introduces ozone to water, which is effective for disinfection and oxidizing certain substances but does not function as a targeted treatment for controlling algae as copper sulfate does.