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What is the main purpose of applying ferrous chloride in primary clarifiers?

To enhance oxygen levels

To treat phosphorus levels

The main purpose of applying ferrous chloride in primary clarifiers is to treat phosphorus levels. Ferrous chloride functions as a chemical coagulant, which aids in the precipitation of phosphorus from wastewater. When added to the influent, it reacts with soluble phosphorus to form insoluble compounds that can then be removed during sedimentation in the clarifiers. This process helps to reduce the phosphorus concentration in the treated water, minimizing the risk of eutrophication in receiving water bodies.

While the other options may relate to various aspects of wastewater treatment, enhancing oxygen levels, increasing clarity, and controlling pH do not specifically align with the primary function of ferrous chloride in this context. The focus on phosphorus removal illustrates effective nutrient management in wastewater treatment processes, highlighting the importance of controlling nutrient levels to protect aquatic ecosystems.

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To increase clarity

To control pH levels

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