Labor (1) Water (1) Sulfides (1) Sewage (1) Sedimentation and deposition (1) Refuse and refuse disposal (1) Materials (1) Lime (1) Hydrogen (1) Helminths (1) Experimental design (1) Evaluation (1) Eggs (1) Attention (1) Ability (1) Residuos (1) Diseño experimental (1) Evaluación (1) Helmintos (1) Huevos (1) Atención (1) Hidrógeno (1) Sedimentación (1) Cal (1) Aguas residuales (1) Materiales (1) Agua (1) Trabajo (1) Aptitudes (1) Sulfuros (1)