After the rough stuff is gone, the water enters a huge, quiet tank called the primary clarifier. Here, the water just sits for a few hours. It’s like a lazy Sunday for wastewater.
Heavier solids—imagine sludge, grease, and tiny bits of organic matter—sink to the bottom. Lighter things like oil and fat float to the top. The scrapers gently push the bottom sludge to a collection pit.
This sludge is called primary sludge. It smells like a gym bag left in a car. But don’t worry—it’s about to get a serious makeover.
