Question

which of the following is not a sustainable wastewater method? chlorination for disinfection graywater used to water yards use of artificial wetlands using open - air stabilization ponds

Explanation:

Sustainable wastewater methods aim to be environmentally friendly, resource - efficient, and have minimal negative impacts. Chlorination for disinfection involves using chlorine, which can produce harmful by - products (like disinfection by - products that are toxic to aquatic life and can have health risks) and is a chemical - based method that is less sustainable compared to the other options. Graywater use for watering yards reuses water, artificial wetlands naturally treat wastewater, and open - air stabilization ponds use natural processes for treatment.

Answer:

Chlorination for disinfection