Which of the following are NOT considered a characteristic of wastewater?

Aesthetic characteristics refer to the sensory properties of wastewater, such as odor, color, and appearance. While these properties may affect perceptions and acceptance of water's quality, they do not inherently define the composition or functional properties of wastewater.

In contrast, physical characteristics relate to measurable attributes like temperature, turbidity, and solids concentration, which impact treatment processes. Chemical characteristics involve the presence of various substances, such as nutrients and contaminants, that can determine the chemical stability and reactivity of the wastewater during treatment. Radiological characteristics include the presence of radioactive substances and are relevant for understanding potential health risks associated with wastewater.

Since aesthetic characteristics do not provide critical information about the composition or treatment requirements of wastewater, they are not classified as a fundamental characteristic in the same way that physical, chemical, or radiological aspects are.