Case Study | October 9, 2012

New Underdrain Prevents Loss Of Media At Mexico's Largest Drinking Water Plant

Source: Severn Trent Services

Located about 78 miles (125 kilometers) west of Mexico City lies the municipality of Villa de Allende, home of Mexico’s largest potable water treatment plant. The Los Berros water treatment plant was constructed in 1980 by the National Water Commission (Conagua), an agency of the Mexican government that manages the nation’s drinking water and wastewater treatment. The plant provides 396.3 million gal/day (1.5 billion l/day) of water to the country’s capital city, equivalent to approximately 25 percent of the total water supply of the western hemisphere’s most populace metropolitan area.

Part of the Cutzamala River system, the treatment plant draws water from seven reservoirs and pumps it to Mexico City via a 79 mile (127 kilometer) aqueduct. Its treatment capacity is 547 mgd (24 m³/s). Los Berros consists of a tank for reception of raw wastewater, filters, chlorine dosing, a Parshall meter (where the coagulant is applied), flocculation, sedimentation and filtration. The original plant filtration system incorporated a nozzle underdrain system, which included five modules of 40 double bays.

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