residuales

In a sentence

• Los productos químicos residuales contaminan los ríos.

  Residual chemicals pollute the rivers.

  The word 'residuales' here is used as an adjective to describe chemicals, indicating that these are leftover or remaining substances that have not been removed or used up.

• Las aguas residuales deben ser tratadas antes de ser liberadas al medio ambiente.

  Wastewater must be treated before being released into the environment.

  In this sentence, 'residuales' describes water, specifically referring to wastewater or sewage, indicating it is water impacted by human activity and requiring treatment.

• Quedan efectos residuales después de la aplicación del medicamento.

  Residual effects remain after the administration of the medication.

  Here, 'residuales' is used to describe effects, indicating leftover or persisting effects that continue to exist even after the primary action has ended.