The city of Puebla (México) has four wastewater treatment plants to service the entire city. The four operate based on a physical-chemical treatment, consisting of pretreatment, lamellar sedimentation and chlorination chamber in the water line.
The purpose of the Ayesa's project has been to equip the facilities with the advanced processes necessary to get the extension and meet the quality objectives.
Barranca del Conde WWTP got 620 liters/second; San Francisco WWTP, 2,700 liters/seconds; Atoyac Sur WWTP, 1,250 liters/seconds; Alseseca WWTP, 1,770 liters/seconds.
In total, water to supply a population equivalent to 2,476,800 inhabitants is treated.
This contract, developed between 2012 and-2013 for the Ministry of Infrastructure of the State of Puebla, represents a milestone in the history of Ayesa in Mexico. The inherent difficulty in this projects is allow the facilities to be expanded without affecting their operation, implementing technologies according to treatment needs, and the possibilities afforded by the premises where the current facilities are located.
The applied technologies were a conventional active sludge process, continuous SBR, and ultrafiltration by means of membranes to obtain water suitable for direct contact with people, and heated anaerobic digestion with cogeneration.
The main activities carried out were:
- Collection, analysis and updating of information.
- Basic studies. Analysis and selection of alternatives for the treatment system.
- Topographic study. Geotechnical study. Gauging and characterization of raw water
- Environmental impact study.
- Documents of the executive project developing the designs and specifications at detailed engineering level of all the disciplines.
- Economic and financial assessment.
- Operation and maintenance manual.