Which of the following does NOT contribute to increased turbidity in wastewater?

Turbidity in wastewater is a measure of the cloudiness or haziness of a fluid and is often caused by the presence of suspended solids such as sediments, microorganisms, and organic matter. Suspended solids and organic matter are both direct contributors to turbidity, as they physically scatter and absorb light, leading to decreased water clarity.

Inorganic nutrients like phosphates and nitrates can also contribute to turbidity indirectly. They support the growth of algae and other microorganisms, which, when present in high quantities, may increase the number of suspended solids and consequently lead to higher turbidity.

Dissolved gases, on the other hand, do not contribute to turbidity. Gases such as oxygen, carbon dioxide, or nitrogen exist in a dissolved state and do not have a significant effect on light transmission through water. They do not form particles or clumps that could cloud the water, thus maintaining its clarity. This makes dissolved gases the correct response, as they do not increase turbidity in wastewater.