principles and practice Sedlak, Richard. text Chelsea, Mich.] Lewis Publishers c1991 2nd ed. monographic xiii, 240 p. : ill. ; 26 cm. [Richard Sedlak, editor]. Includes bibliographical references and index. n-us--- Sewage Purification Nitrogen removal Sewage Purification Phosphate removal Sewage disposal United States Case studies TD758 .P46 1991 658.3/57 0873716833 91029578 http://www.loc.gov/catdir/enhancements/fy0729/91029578-d.html http://www.loc.gov/catdir/enhancements/fy0729/91029578-d.html UOEL 000 20170713100603.0 000