municipal refuse उदाहरण वाक्य

In the early 1970s Herbert R . Appell and coworkers worked with hydrous pyrolysis methods, as exemplified by U . S . patent 3, 733, 255 ( issued in 1973 ), which discusses the production of oil from sewer sludge and municipal refuse by heating the material in water, under pressure, and in the presence of carbon monoxide.