The liquid that drains or leaches from a landfill, carrying dissolved and suspended matter, is called

The liquid that drains and leaches through a landfill carrying dissolved and suspended matter is called leachate.

Sludge is the settled solid residue from treating water or sewage, not landfill drainage.

Slurry is a thick mix of solids in liquid, not the seepage from a landfill.

Effluent is liquid waste discharged from a plant or pipe, a broader term than landfill seepage.

Rainwater soaking through buried waste dissolves pollutants and emerges as leachate.

Landfill liners and collection pipes trap leachate to stop it reaching groundwater.