CWEA Maintenance Technologist Practice Test

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Which is a common application of sodium hypochlorite in various industries?

Sewage treatment
Soil fertilization
Food preservation
Paint production

The correct answer is: Sewage treatment

Sodium hypochlorite is commonly used in sewage treatment due to its strong oxidizing properties and effectiveness as a disinfectant. In wastewater treatment facilities, it helps in the chlorination process, which is essential for killing harmful pathogens and microorganisms present in sewage. This disinfection process is crucial for ensuring that treated water meets health and safety standards before being released into the environment or reused. While sodium hypochlorite can have applications in other areas such as food preservation by acting as a sanitizer, its predominant and most recognized use is in water treatment, particularly in the context of sewage and wastewater management. The other listed applications—soil fertilization and paint production—are not relevant to sodium hypochlorite’s primary function or capabilities. Thus, its application in sewage treatment stands out as the most common and significant.