Wastewater Treatment Plants (WWTPs): They are extensively used in the biological treatment stages of municipal and industrial wastewater treatment plants. Disc diffusers introduce air or oxygen into wastewater, promoting the growth of beneficial microorganisms that break down organic pollutants. This process, known as aerobic digestion, is essential for reducing the biological oxygen demand (BOD), chemical oxygen demand (COD), and managing nitrogen and phosphorus levels in the effluent.

Aquaculture: In fish farming and aquaponics systems, maintaining adequate oxygen levels in water is crucial for the health and growth of aquatic life. Disc diffusers are used to aerate water in tanks, ponds, and raceways, ensuring that fish and other aquatic organisms have sufficient oxygen for respiration.

Lake and Pond Aeration: Disc diffusers can be used in lakes and ponds to increase oxygen levels, which helps prevent the growth of anaerobic bacteria that can produce harmful toxins. Aeration also promotes the breakdown of organic matter, reducing sludge buildup and improving water quality.

Biogas Plants: In the context of biogas production, disc diffusers are used in aerobic digesters to stabilize the organic matter. Aerobic treatment can be a part of the pretreatment process or used for treating the digestate. Aeration helps in reducing odors and lowering the concentration of pathogens.

Hydroponic Systems: Although less common, disc diffusers can be used in hydroponic farming systems to oxygenate the nutrient solution. Oxygenated water enhances root health and nutrient uptake, leading to better growth and yield of the plants.

Industrial Processes: Some industrial processes require aeration to facilitate certain chemical reactions, for instance, in the treatment of process waters and in the aeration of cooling towers.