Composition (1) Lady's maids (1) Women household employees (1) Sewage (1) Industrialists (1) Factory and trade waste (1) Household employees (1) Dairy waste (1) Processing (1) Residuos industriales (1) Effluents laitiers (1) Déchets industriels (1) Composition (1) Transformation (1) Employés de maison (1) Employées de maison (1) Industriels (1) Eaux usées (1) bien (1)