Wastewater New York State Practice Exam

Which factor is least likely to be considered when applying chemicals for phosphorus removal?

1. Amount of phosphorus present

2. Ambient air temperature

3. Chemical dosage

4. pH of the water

The correct answer is: Ambient air temperature

When applying chemicals for phosphorus removal, the ambient air temperature is generally not a critical factor. The primary focus in the phosphorus removal process involves understanding the concentration of phosphorus present in the wastewater, determining the appropriate chemical dosage needed to effectively bind and remove the phosphorus, and maintaining an optimal pH to facilitate the chemical reactions involved. The amount of phosphorus present is essential since it directly influences how much chemical will be needed to achieve effective removal. Similarly, the chemical dosage is vital to ensure that the correct quantity of the removing agent is applied for efficiency and cost-effectiveness. The pH of the water can significantly affect the solubility of various phosphorus compounds and the effectiveness of the chemicals used for removal, making it a crucial factor in the treatment process. In contrast, while ambient air temperature can impact various biological processes in wastewater treatment, it has a minimal direct effect on the chemical reactions involved in phosphorus removal. Therefore, when considering the factors specifically related to chemical application for phosphorus removal, ambient air temperature is least likely to be a primary concern.