600 

 500 



=■ 400 



~ 300 



Q 



8 200 

 100 







6/96 



9/96 12/96 



3/97 



6/97 



9/97 



12/97 



3/98 



Figure 1 . Chemical Oxygen Demand Concentration as a Function of Time 



6/96 9/96 12/96 3/97 6/97 9/97 12/97 



Figure 2. Ammonium Concentration as a Function of Time 



3/98 



TO 



O 

 0- 



6/96 



9/96 



o Influent 

 d Cattail 

 o Bulrush 

 x Control 



12/96 



3/97 



6/97 



9/97 



12/97 



Figure 3. Phosphate (as P) Concentration as a Function of Time 



3/98 



Stein et al 



