Santa Margarita Advanced Wastewater Treatment Plant, Santa Margalida, Mallorca

Santa Margarita is an advanced wastewater treatment plant located in Santa Margalida, on the island of Mallorca in the Illes Balears region of Spain. The facility serves a population of approximately 2,967 residents and has a design capacity of 4,500 cubic meters per day, with an average discharge volume of 827.25 cubic meters per day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. This level of treatment is typical for plants discharging into sensitive environments, such as coastal areas or water bodies prone to eutrophication. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), advanced treatment is required for discharges into sensitive areas. The treated effluent is discharged into the local environment, likely into the Mediterranean Sea given the plant's coastal location. The surrounding watershed includes the Pla de Mallorca region, and the discharge ultimately reaches the Balearic Sea. The advanced treatment helps protect coastal water quality and marine ecosystems, supporting tourism and biodiversity in the area.

The plant discharges into the Mediterranean Sea via the Balearic Sea, which is a semi-enclosed sea with limited water exchange. The coastal waters around Mallorca support diverse marine life, including seagrass meadows and fish populations. Advanced treatment reduces nutrient loads, helping to prevent eutrophication and algal blooms that can harm these ecosystems.