Related Links: D.C. Water Undertakes Three Major Environmental Projects DC Water Fact Sheet on Biosolids Project The District of Columbia's water and sewer authority is coming close to finalizing work on its $470-million biosolids project. George Hawkins, DC Water's general manager, says the 90%-complete project should be up and running by late summer or early fall.The system will convert wastewater sludge from the Blue Plains advanced wastewater treatment facility, which currently treats approximately 370 million gallons a day of wastewater, into a Class-A biosolid using thermal hydrolysis. The process is a proven technology in Europe but has never been used
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.