Wastewater New York State Practice Exam

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Which statement about Liquid Sodium Hypochlorite (NaOCl) is INCORRECT?

It is commonly used for disinfection of final effluent waters
It should be stored away from sunlight
If mixed with wastewater, fecal counts may increase
It can react with other chemicals to produce harmful byproducts

The correct answer is: If mixed with wastewater, fecal counts may increase

The statement regarding the mixing of Liquid Sodium Hypochlorite with wastewater and the potential increase in fecal counts is not accurate. While NaOCl is utilized for disinfection in wastewater treatment processes to reduce microbial populations, including fecal coliforms, its function is to decrease contaminants rather than increase them. Sodium Hypochlorite acts as a strong oxidizing agent, effectively killing bacteria and pathogens, rather than promoting their growth. The other statements present accurate information about Sodium Hypochlorite. For instance, its common use for disinfection highlights its significance in ensuring that treated effluent meets water quality standards before being released into water bodies. Storing it away from sunlight is crucial because exposure to light can degrade the chemical, reducing its effectiveness. Additionally, the ability of Sodium Hypochlorite to react with various substances to produce harmful byproducts underscores the necessity for careful handling and proper procedures in wastewater treatment operations.