However, with only a few exceptions (Martin et al.,
1985). the effectiveness of such recycling has not been
measured directly and is only an estimate obtained
from data on nutrient removal and algal growth,
without due consideration of the importance of other
processes such as ammonia stripping, which are known
to occur during wastewater treatment (Pouliot et al.,
1989; Talbot and De la Notie, 1993).