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Completion of the Atotonilco wastewater treatment plant in Mexico's Hidalgo state has been pushed back to February 2015, BNamericas has learnt.
"The original construction schedule has been extended as various works required to improve the plant were not initially contemplated," according to information from the national water commission, Conagua.
Key upgrades include the construction of 30 biodigestors instead of 28 and separate road accesses to divert plant traffic from the local town.
The plant was originally due to be in operation by the beginning of 2014, following a one-year stabilization period initially due to start this January.
Construction is currently 70% complete and the chemical treatment system is expected to be in operation by 2Q14. Following construction of the conventional treatment system and a six to eight month stabilization process, the plant will be fully operational by February 2015, according to Conagua.
The design, build and operation of the 33m3/s plant is being carried out by a consortium comprised of IDEAL, Acciona Agua, Atlatec and ICA (BMV, NYSE: ICA) at a cost of 10.1bn pesos (US$815mn), over US$100mn more than originally budgeted.
Atotonilco will be the largest plant in the world to be built in one phase.
The treatment plant will process 60% of wastewater generated in Mexico City, receiving effluent from the Emisor Central and Emisor Oriente drainage tunnels.
Conagua has been allocated a 2.14bn-peso budget for this year to cover works related to construction of the plant as well as the Túnel Emisor Oriente and Túnel Emisor Central stormwater drainage tunnels.