Massachusetts Wastewater Practice Exam 2025 – Complete Prep Resource

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What is the goal of raising the pH in chrome waste treatment?

To dissolve chrome

To precipitate chrome

The goal of raising the pH in chrome waste treatment is to precipitate chrome. In wastewater treatment, particularly for chrome, increasing the pH causes chromium in its soluble form (often as Cr^6+, hexavalent chromium) to convert into an insoluble form (typically Cr^3+, trivalent chromium) that can then be removed from the solution as a precipitate. This is essential in reducing the toxicity of the chrome and facilitating its removal from the wastewater. By manipulating the pH, treatment processes can effectively separate contaminants, ensuring that the effluent adheres to environmental regulations and is safe for discharge or further processing.

The process does not primarily aim to dissolve chrome, enhance chemical reactions in a general sense, or displace other metals, but rather to transform and separate chromium from the wastewater stream.

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To enhance chemical reactions

To displace metals

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