Nov 2, 2014 - awarded to an IDEAL-led consortium through international bidding in. December 2009 against the OHL Medio.
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P RO J E C T R E P O RT
Atotonilco, the biggest WWTP of its kind At the beginning of 2010, the National Water Commission of Mexico, Conagua, signed agreements with a consortium of companies to construct a new wastewater treatment plant in Atotonilco, Hidalgo, Mexico. When completed the plant will be the largest wastewater treatment project in Mexico and one of the largest of its kind in the world. The USD 710m wastewater treatment plant is being built in two phases on a build-operate-transfer (BOT) basis at Atotonilco town, about 60 km from Mexico City. The installed treatment capacity in the Atotonilco area is currently 11.6% per day. Once finalized the new plant is said to be able to treat 3.6m tons of water per day, raising the installed treatment capacity of the town to 60%. The plant will treat wastewater at the rate of 23m3/s in the first phase. In the second phase the treatment capacity will be increased by another 12m3/s. Preliminary construction works started in 2010 with the first phase of the project being completed in 2013. The second and final phase of construction is expected to be completed in the second half of 2014. The wastewater treatment plant is expected to start commercial operation in early 2015. water treatment plants in the Valley of Mexico to attain its goal to treat 100% of the wastewaters of municipalities by 2020 and of industries by 2025.
Atotonilco wastewater treatment project
Alfalfa is the main crop irrigated with wastewater from Mexico City (Photo: Fir0002/Flagstaffotos)
Project background The Hidalgo state is one of the principal sources of agriculture in Mexico. The alfalfa fields in the region are irrigated by using the untreated wastewater released from the metropolitan areas of Mexico City, which has been a major
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concern causing health problems and environmental pollution. To overcome these problems, the Atotonilco project was taken up as part of the Sustainable Water Program for the Mexico Valley. The Sustainable Water Program also includes the construction of another five
The Atotonilco project will provide treated water for irrigation of around 80,000ha in the Tula Valley of Hidalgo. It will improve living conditions of approximately 300,000 inhabitants in the region, who at the moment do not have access to treated water. The project will also hygienise 60% of wastewater from the metropolitan areas of Mexico City, which has a population of 20m. The Atotonilco project will thus significantly improve the environmental conditions and raise the overall water treatment rate of the country from 36% to 60%. The contracts for the BOT project were awarded to an IDEAL-led consortium through international bidding in December 2009 against the OHL Medio Ambiente consortium. The consortium is responsible to design, execute, construct and install all electromechanical equipment, as well as test the operations. The construction will take approximately three years and the consortium will operate, conserve and maintain the water treatment plant for 22 years. The scope of work also includes the cogeneration of electricity at the plant and the disposal of sludge. At the start the project was estimated to generate 7,000 direct and indirect jobs during the construction phase. November 2014
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P RO J E C T R E P O RT
The Atotonilco WWTP is set to be completed and operational in 2015.
Wastewater biological treatment The plant will use biological treatment to treat around 1.99m m³ a day. It will have a primary treatment capacity of 1m m³ a day for use in wet weather conditions, which is expandable to 2.5m m³. The plant’s total design capacity is around 4.5m m³ a day. The average wastewater treatment capacity of the plant will be up to 42m³/s. The average dry season treatment capacity is expected to be 23m³/s and during wet conditions, the capacity will be increased to 35m³/s using a physicalchemical process. The plant’s operations will also include evacuation of the solid waste and the sludge generated. The plant will have a cogeneration system to convert the biogas (methane) produced during the digestion process for maximum energy efficiency.
Atotonilco plant key players Aguas Tratadas del Valle de Mexico (ATVM) is the consortium formed to implement the project. The consortium will construct and operate the Atotonilco wastewater treatment plant for 22 years as per an agreement with the National Water Commission of Mexico (CONAGUA), an agency under the Ministry of the Environment and Natural Resources (SEMARNAT). The consortium is led by Impulsora del Desarrollo y el Empleo en America Latina
(IDEAL), which holds a 40.8% stake in ATVM. IDEAL will realise the Atotonilco wastewater treatment project through its Promotora del Desarrollo de América Latina unit.
The new WWTP will be one of the largest of its kind in the world.
The stake holders in ATVM include Acciona Agua (24.26%), Atlatec (24.26%), which is a subsidiary of Mitsui & Co and Toyo Engineering, and ICA subsidiary Controladora de Operaciones de Infraestructura (10.2%), DYCUS and other minority investors. The project is being funded by Mexico’s national development fund, FONADIN, which will finance around 46% of the total cost, 51.66% by the consortium partners and the remainder through commercial bank credit. On 18 January 2010, Green Gas was awarded the contract for the construction, operation and maintenance of combined heat and power (CHP) plants at the wastewater treatment plant. The greenhouse gas methane released by the wastewater will be used for
generating heat and electricity through the CHP plants. The plants will have a 33MW capacity and will help to reduce greenhouse gas emissions by around 1m tons of CO2 per year. In December 2010, Conagua awarded a $14.5m contract to a consortium of Ayesa, Exito, FOA and Canal de Isabel II. Under the contract, the consortium will undertake supervision, engineering and commissioning works of the plant. World Finance awarded the Consortium Aguas Tratadas del Valle de Mexico ( ATVM) the 2013 Year Award for the Atotonilco WWTP. The award was collected by Luis Castilla, ACCIONA Agua Chairman, Sergio Ramirez Lomelin, IDEAL Energy and Water Director, and Alejandro Gaza, Atlatec General Manager. The three of them are members of the ATVM consortium. The award recognizes the Atotonilco WWTP performance: until now, it only treated 5% of the water, from now on it will treat 60% of it. With that implies: improved health problems, irrigations, and arrival of clean water to all over the country.
Facts & Figures Project type: Location:
Capacity: Population served:
New wastewater treatment plant Atotonilco, Hidalgo state, Mexico 3.6m tons per day 300,000
Valve info Typical valves used in waste plants include: butterfly valves, gate valves, knife gate valves, globe valves, ball valves, and plug valves.
Timeline of the project
2
Start of construction
Completion phase 1
World Finance Award
Completion phase 2
Commercial operation
2010
2013
2013
Late 2014
2015
November 2014
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