California Wastewater Treatment Operator Practice Exam 2025 – All-in-One Guide to Master Your Certification

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Which of the following will not affect settling characteristics in a clarifier?

pH level

temperature

depth of launder

The depth of the launder does not directly influence the settling characteristics of solids in a clarifier. Settling characteristics are primarily determined by factors such as particle size, shape, weight, and the interactions between particles, including the presence of any chemicals that might aid or hinder settling.

In contrast, pH level can affect the charge and behavior of suspended particles, potentially leading to changes in settling rates. Temperature also impacts settling, as warmer water can reduce viscosity, allowing particles to settle more rapidly. Lastly, the concentration of suspended solids plays a crucial role because higher concentrations can lead to increased interactions between particles, affecting the overall dynamics of settling. Therefore, while the launder's depth is important for proper flow management, it does not directly alter how well solids settle.

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concentration of suspended solids

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