Earth Tech has been awarded a contract from Fideicomiso del Sistema de Aguas Residuales del Alto Rio Blanco (FIRIOB) for a wastewater treatment plant in the city of Orizaba, about 200km SE of Mexico City. The 20-year old, USD 15.45 million D/B/O project is one of the largest anaerobic/aerobic wastewater treatment systems in the world. When finished, the system will treat 28.5 million gallons of wastewater per day, with a Biochemical Oxygen Demand of 109.9 tons per day. The facility will treat wastewater from Orizaba as well as wastewater produced from a paper mill, brewery facility and another 12 industries. Work on this project has begun and is scheduled for completion in August 2004. The wastewater treatment system will include coarse screening, sand trap, fine screening, equalisation, anaerobic and polishing aerobic step with nitrification and denitrification. For solid wastes, the facility includes sludge storage tank, rotary thickening, centrifuges and rotary kiln incinerator. The fuel for this incinerator will be biogas generated in the anaerobic reactors.
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