The Wastewater Treatment Plant “San Pedro Mártir” treats 20% of the wastewater from the Querétaro metropolitan area, equivalent to 1 million people, under a BOT scheme that considers the design, construction, financing, operation and maintenance of the project for 20 years.

The main processes include: pretreatment, primary treatment, biological treatment with nutrient removal, disinfection, sludge treatment, anaerobic digestion, sludge dewatering and cogeneration with biogas for the production of electrical energy and heat recovery.