Los Alcázares Wastewater Treatment Plant: Serving the Mar Menor Region in Murcia, Spain

The Los Alcázares wastewater treatment plant is a municipal facility serving the town of Los Alcázares in the Región de Murcia, southeastern Spain. With a population equivalent of 61,529, it falls under the EU classification of a medium-to-large agglomeration, requiring advanced treatment to protect sensitive receiving waters. As a Spanish plant operating under the EU Urban Waste Water Treatment Directive (91/271/EEC), the facility is expected to meet secondary or tertiary treatment standards, particularly given its proximity to the Mar Menor, a designated sensitive area under the directive. And it serves a population that places it in a regulatory tier requiring nutrient removal to prevent eutrophication. The treated effluent discharges into the Mar Menor, a hypersaline coastal lagoon connected to the Mediterranean Sea via the Gola channels. The Mar Menor is a critical ecological zone supporting seagrass meadows, fish nurseries, and migratory bird populations. The plant's operation is vital for controlling nutrient and pollutant loads that could otherwise degrade this fragile coastal ecosystem.

The plant discharges into the Mar Menor, a hypersaline coastal lagoon on the Mediterranean coast of Spain. The lagoon is connected to the Mediterranean Sea through several channels and supports diverse aquatic life, including seagrass meadows and fish nurseries. The surrounding Campo de Cartagena agricultural area contributes runoff, making the plant's nutrient removal role critical for preventing algal blooms and maintaining water quality in this ecologically sensitive water body.