Aeration Basin and Piping prior to Diffuser Installation Nogales International WWTP Upgrade, International Boundary Water Commission, Nogales AZ Water Works Engineers was a member of the Design-Build team for the $51 million conversion of the 14.74 mgd Nogales International Wastewater Treatment Plant from an aerated lagoon facility to an activated sludge plant. WWE was responsible for the process mechanical design of the activated sludge and solids dewatering facilities. The activated sludge facilities included three parallel trains of concrete aeration basins followed by three 115-foot diameter secondary clari?ers. The facilities were laid out to accommodate the future addition of a fourth aeration basin and clari?er train. The aeration basin was designed with two anoxic cells in series a

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