Tennessee Wastewater Operator Practice Exam

What does the paint filter test measure in wastewater treatment?

1. Presence of heavy metals

2. Amount of free water in screenings and grit

3. Solids concentration in sludge

4. Biochemical oxygen demand levels

The correct answer is: Amount of free water in screenings and grit

The paint filter test specifically measures the amount of free water that can be squeezed out of solid materials, such as screenings and grit, in wastewater treatment. This test is vital for determining the moisture content of these solids, which can influence handling and disposal methods. When screenings and grit are processed, knowing the free water content helps determine their characteristics and how they will behave during further processing or disposal. In wastewater treatment, managing the solid content effectively is important for operational efficiency. If too much free water is present, it can result in added weight and volume, increasing transportation and disposal costs. The paint filter test provides a straightforward method to evaluate this, making it an essential tool for operators to optimize waste management practices.