MWRD Calumet Plant Disinfection Facility Begins Operation

July 20, 2015
The new facility is designed to improve the water entering the Chicago Area Waterways

U.S. Senator Dick Durbin (D-IL), U.S. Environmental Protection Agency (EPA) Region 5 Administrator Susan Hedman and other community leaders joined the Metropolitan Water Reclamation District of Greater Chicago (MWRD) in unveiling the new disinfection facility at the Calumet Water Reclamation Plant (WRP) on Friday July 17.

The new facility is designed to improve the water entering the Chicago Area Waterways (CAWS) from the treatment facility that serves more than 1 million people in a 300-sq-mile area covering the South Side of Chicago and surrounding south suburbs.

"A safe and healthy waterway system benefits recreation and economic development alike, yet until now, Chicago was the only major U.S. city that failed to disinfect its treated sewage before it was pumped into the river system. With this new facility, the Metropolitan Water Reclamation District will now begin disinfecting wastewater for more than one million people, bolstering the area's economic development and strengthening Chicago's lakefront," Senator Durbin said. "I appreciate the ingenuity that went into this project from staff at the District and the investment made by our area leaders who made this possible. Together, we have chosen to make our waterways a priority and take an important step in making our goals of a cleaner environment a reality."

The new step in the MWRD's water treatment protocols will include the chlorination/dechlorination process. This new process will reduce the amount of pathogenic bacteria in the water released from the plant into the Calumet River system. Disinfection technologies neutralize or kill bacteria and microorganisms in treated water and reduce the risk of health problems resulting from direct contact with the water while recreating on a waterway. Disinfection occurs after wastewater passes through a series of treatment processes, including screening, filtering, settling, microbial aeration.

In addition to the disinfection facility at the Calumet WRP, the MWRD is also building a similar facility at the O'Brien WRP in Skokie by implementing an ultraviolet irradiation system to disinfect water entering the CAWS. The MWRD has allocated resources and funding to allow disinfection to occur without increasing taxes.

As recent as 2011, the CAWS had secondary classification for water quality standards, meaning direct contact with water was not possible outside of boating. But in advance of a possible decision by the U.S. Environmental Protection Agency to one day re-classify the CAWS for allowing primary contact, the MWRD Board of Commissioners adopted a policy to disinfect on June 7, 2011. MWRD officials instituted a blue ribbon panel to evaluate available disinfection technologies and devoted eight months to research and testing to determine optimal solutions for disinfecting at the most economical cost.

Using an existing chlorine contact chamber retrofitted for more efficient contact, the disinfection technologies neutralize or kill bacteria and microorganisms in treated water. Engineers modified the existing chlorine contact basin by replacing all interior baffle walls and associated walkways; replacing weir gates, discharge gates, drain sluice gates, inlet sluice gates and a bypass sluice gate; replacing liquid sodium hypochlorite diffuser piping; installing liquid sodium bisulfite diffuser piping; and installing sampling pumps.

In operation since 1922, Calumet WRP is the oldest of the seven MWRD plants in operation. The plant, which is home to 268 employees, will treat an average 354 million gal per day and a maximum 430 million gal per day.

Source: Metropolitan Water Reclamation District of Greater Chicago

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