The District of Columbia Water and Sewer Authority (DC Water) plans to start work on two environmental projects at the Blue Plains advanced wastewater treatment plant located in Washington, D.C, US.
The first project, valued at $400m, includes installation of thermal hydrolysis and anaerobic digesters.
The process pressure-cooks the solids left over after wastewater treatment to produce combined heat and power.
The process pressure-cooks the solids left over after wastewater treatment to produce combined heat and power, generating 13MW of electricity.
The second plant, Enhanced Nutrient Removal facility valued at $1bn, will reduce the amount of nitrogen in effluent to meet the new US EPA and Chesapeake Bay Program goals of 4.7 million pounds per year or less in 2014.
DC Water expects to complete the wastewater treatment projects in 2014.
DC Water said the Blue Plains facility processes an average of 370 million gallons of wastewater per day.