Solids (7) Sólidos (7) Refuse and refuse disposal (6) Ability (6) Residuos (6) Estudio (6) Aptitudes (6) Matter (4) Materia (4) matière (4) Colombie (3) Methodology (3) Materials (3) Attachment and garnishment (3) Embargo (3) Información (3) Metodología (3) Materiales (3) Water--Purification (2) Water (2) Trials (2) Temperature (2) Sugar (2) Sewage--Purification (2) Research (2) Profit (2) Production (Economic theory) (2) Possibility (2) Plants (2) Pipe (2)