Massachusetts Wastewater Practice Exam

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What does zinc and chrome hydroxide treatment require?

High temperature.
Equalization.
pH control.
Oxidizing agents.

The correct answer is: pH control.

Zinc and chrome hydroxide treatment is a specific process that focuses on the removal of heavy metals, primarily zinc and chromium, from wastewater. For this treatment process, controlling the pH is crucial. The solubility of metal hydroxides is highly dependent on the pH level in the treatment system. When the pH is adjusted to an appropriate value, typically alkaline conditions are favorable for precipitating these metals as hydroxides, allowing them to be effectively removed from the wastewater. If the pH is not maintained correctly, the precipitation may not occur effectively, leading to higher concentrations of toxic metals in the effluent. Thus, maintaining proper pH is an essential part of ensuring the successful removal of zinc and chromium from the wastewater stream. The other options, while they may be relevant in different contexts of wastewater treatment, do not specifically apply to the requirements for zinc and chrome hydroxide treatment as directly as pH control does.