Nitrification of secondary municipal waste effluents by rotating bio-discs / 
Jack A. Borchardt...[et. al.] 
 - Washington :  U.S. G.P.O.,  1978 
 - xiii, 138 p. :  ill. ;  28 cm. 
<br/><br/> June 1978  Grant no. R803407 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fish culture--Water reuse<br/>Suspended sediments<br/>Biochemical oxygen demand<br/>Ammonia<br/>Water--Phosphorus content<br/>Water--Nitrogen content
<br/><br/><label>Dewey Class. No.: </label>639.8028