Texas Wastewater Class B Practice Exam

Which of the following conditions is indicative of a properly functioning wastewater treatment process?

1. High levels of acute toxicity

2. Stable population of microorganisms

3. Excessive volatile solids

4. Imbalanced pH level

The correct answer is: Stable population of microorganisms

A stable population of microorganisms is indeed indicative of a properly functioning wastewater treatment process. In biological wastewater treatment systems, microorganisms play a crucial role in breaking down organic matter and removing contaminants. A stable microbial population suggests that the treatment process is well-balanced and that the microorganisms are thriving, which enhances the efficiency of waste degradation and nutrient removal. When the microbial community is healthy and stable, it indicates that the system is functioning effectively, as these microorganisms are vital for processes such as aerobic and anaerobic digestion. A fluctuation in microbial populations can lead to reduced treatment effectiveness and potential system failures. In contrast, high levels of acute toxicity, excessive volatile solids, and imbalanced pH levels point toward issues in the treatment process. High toxicity can hinder the activity of beneficial microorganisms, excessive volatile solids can indicate inefficiencies in solids removal, and imbalanced pH can adversely affect microbial activity, all of which would compromise the treatment process rather than signify proper function.