Texas Wastewater Class B Practice Exam

Which of the following is considered a stable organic matter characteristic in wastewater?

1. Dissolved or suspended

2. Non-biodegradable content

3. Heavy metal contamination

4. Increased total suspended solids

The correct answer is: Non-biodegradable content

The characteristic of stable organic matter in wastewater is the non-biodegradable content. This refers to substances that do not easily break down or decompose through biological processes. In the context of wastewater treatment, it is important to identify and manage non-biodegradable materials because they can persist in the environment and contribute to long-term pollution issues. Stable organic matter often includes synthetic compounds from industrial discharges or materials such as plastics and certain chemicals that resist microbial degradation. Understanding the presence of non-biodegradable content helps wastewater treatment facilities design effective treatment processes and ensure compliance with environmental regulations. On the other hand, dissolved or suspended materials typically comprise organic matter that can be biodegradable, distinguishing it from stable organic matter. Heavy metal contamination is more about inorganic pollutants rather than organic matter stabilization. Increased total suspended solids can indicate a higher level of solid materials in wastewater but does not specifically point to stability or the degradability of organic matter. Thus, the identification of non-biodegradable content as a stable organic matter characteristic holds significant relevance in the management and treatment of wastewater.