Duddles, Glenn A. <br/><br/>
Application of plastic media trickling filters for biological nitrification systems /  by ... and Stevens E. Richardson 

 - Washington :  U. S. Environmental Protection Agency,  1973 
 - 111, 1 p 
 - Environmental protection technology series ;  EPA-R2-73-199 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification--Filtration<br/>Water--Purification--Biological treatment
<br/><br/><label>LC Class. No.: </label>TD475 D8