In addition to constructing La Farfana in record time, renovating El Trebal and completing Mapocho, under its contract to treat and manage water supplies in the Santiago region (Region Metropolitana), SUEZ is in charge of Operating and Maintaining these three Wastewater treatment plants (PTARs) thanks to its past experience with water treatment facilities.
SUEZ completes a series of improvements, such as using 100% of the biogas generated by extending the Mapocho-Trebal treatment plant, and optimising current processes to double the El Mapocho-Trebal plant's capacity to treat urban effluents from 380,000 m³/day (equivalent to 2 million inhabitants) to a peak future capacity of 760,000 m³/day (equivalent to 4 million inhabitants).
This assignment also includes designing and constructing a treatment plant in order to eliminate nitrogen from the digested sludge drying residues from La Farfana and Mapocho-Trebal, and modernising equipment to take full advantage of the energy generated by the facility from sludge digestion, heat recovery and power generation, as per the targets set by Aguas Andinas. We also aim to use 100% of the biogas produced for either power or heat.
We are responsible for continuously operating and maintaining the Mapocho-Trebal and La Farfana plants for the operator, Aguas Andinas, and optimising existing processes at all times over the 10-year period of the contract.
In addition, we manage selected nitrogen treatment processes for digested sludge residues from the La Farfana and Mapocho-Trebal wastewater treatment plants. This involves a deammonification process using the Anammox method of anaerobic oxidation of ammonium with nitrites. This process offers an alternative, low-cost and environmentally-friendly solution compared with traditional nitrogen removal techniques using nitrification and denitrification.
This biological process is broken down into two phases:
Unlike conventional deammonification methods, this process does not require the addition of biodegradable carbon. Available carbon increases biogas production capacity.
In addition, the extension to the Mapocho-Trebal cogeneration plant includes two cogeneration units and facilities, and/or the services required to run the equipment to be fitted at the plant. The new facilities will include the following units:
SUEZ uses the principles of the circular economy by providing the Santiago region with a treatment system able to function as a biofactory, or independent energy plants, establishing benchmark technological performance levels at an international level, guaranteeing quality of service and providing a sustainable water supply to Santiago.
The main benefits:
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