| Subject | English | Spanish |
| environ. | digested sludge Sludge or thickened mixture of sewage solids with water that has been decomposed by anaerobic bacteria | barro activo |
| environ. | digested sludge | fango digerido |
| environ. | digested sludge | barro activo |
| water.suppl. | digested sludge | iodo digerido |
| environ., industr. | digested sludge dewatering | agotamiento de fango digerido |
| earth.sc., mech.eng. | digested sludge pump | bomba para fango digerido |