Zimmo , Omar <br/><br/>
Nitrogen transformations and removal mechanisms in algal and duckweed waste stabilisation ponds / 
by Omar Zimmo 
 - Lisse , The Netherlands :  A. A. Balkema ,  2003 
 - 133 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9058095762 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Nitrogen removal<br/>Sewage lagoons<br/>Algae--Metabolism<br/>Duckweeds--Metabolism