This plant upgrade included the construction of new concrete final settling tanks, anaerobic digesters, sludge storage tanks, control buildings, digester buildings and chemical buildings. The facility included a number of unique features, such as the split flow treatment whereby high flows from snow melt and heavy rain are diverted to storm tanks to undergo physical and chemical treatment only. Dry weather flows receive full secondary treatment (activated sludge). The two treated effluent streams are then blended and disinfected by ultraviolet irradiation. Attention to intricate scheduling was needed for the retrofit of the existing aceration basins and control building. Plant capacity was increased from 5,000 to 12,000 persons and the effluent quality entering the Mississippi River has substantially improved.
Architect: J.L. Richards & Associates Ltd.
Structural Engineer: J.L. Richards & Associates Ltd.
Mechanical Engineer: J.L. Richards & Associates Ltd.
Electrical Engineer: J.L. Richards & Associates Ltd.
Civil Engineer: J.L. Richards & Associates Ltd.