What goes down your toilet and drain can end up on farm fields across the United States. Biosolids, or sewage sludge, are the ...

At most treatment plants, wastewater is pumped in through large pipes and large debris removal ... open-air and cone-shaped tank where gravity pulls heavier solids to the bottom.

Here's how they're made: At most treatment plants, wastewater is pumped in through large pipes and large debris ... open-air and cone-shaped tank where gravity pulls heavier solids to the bottom.

Here's how they're made: At most treatment plants, wastewater is pumped in through large pipes and large debris removal begins ... a large, open-air and cone-shaped tank where gravity pulls heavier ...

Here's how they're made: At most treatment plants, wastewater is pumped in through large pipes and large debris ... open-air and cone-shaped tank where gravity pulls heavier solids to the bottom.