What is the particle size range for algae in water treatment?

The correct answer signifies that algae can typically be found in a range from 3 to 1,000 microns in size. This size range is particularly relevant in water treatment processes, where understanding the dimensions of contaminants is crucial for effective removal and control.

Algae, as microorganisms, can vary widely in size. Some single-celled species might be at the lower end of this spectrum (around 3 microns), while larger multicellular filaments or colonies can exceed 1,000 microns. Recognizing this wide size variation assists water treatment operators in selecting appropriate filtration and disinfection methods.

The range highlighted in the correct answer aligns with the sizes of algae that can be present in raw water sources, influencing methods such as coagulation, sedimentation, and filtration. Hence, acknowledging this size range contributes significantly to optimizing the treatment process and ensuring water quality.

Other options present either a more narrow range or sizes that do not encompass the full spectrum of possible algal sizes relevant to water treatment. Understanding the actual size range of algae helps in determining how to best manage them within treatment systems, ensuring their removal and preventing issues like algal blooms that can affect water quality and safety.