Texas Wastewater Class B Practice Exam 2025 - Free Wastewater Class B Practice Questions and Study Guide

The typical pH range of influent entering a wastewater treatment plant is generally between 6.5 and 8.0. This range is considered optimal for many biological processes involved in wastewater treatment. Maintaining a pH within this range helps support the activity of microorganisms that play a crucial role in breaking down organic materials in the wastewater.

The lower end of the scale, at 6.5, indicates a slightly acidic environment which can still be beneficial for microbial activity, while the higher end, at 8.0, represents slightly alkaline conditions that are typically well-tolerated by microorganisms.

Outside of this specified range, the treatment process may be less efficient. A pH lower than 6.5 could inhibit microbial functions, while a pH higher than 8.0 might lead to ammonia toxicity and precipitation of certain compounds, complicating treatment processes. Therefore, the choice reflecting a pH range of 6.5 to 8.0 accurately represents the conditions that facilitate effective wastewater treatment.