Organic Waste Recycling

Aquatic weeds and their utilization 357

concentrations of ammonium nitrogen removal to be proportional to the reactor
length within the experimental conditions employed.

Figure 7.15 BOD removals as a function of BOD loading in aquatic systems (after
Stowellet al. 1981; reproduced by permission of the American Society of Civil
engineers)

Weber and Tchobanoglous (1986) developed an equation for ammonium
nitrogen removal in water hyacinth reactors as follows:

q

kl

Nr

.

= (7.10)

Where,

Nr = ammonium nitrogen removal, mg/L

k = rate coefficient, mg/(L-day)

q = hydraulic application rate, m^3 /m^2 -day

l = reactor distance, m

BOD

removed, kg / (ha-day) 5

BOD 5 loading, kg / (ha-day)

Water hyacinth systems

Emergent plant systems

DATA FROM 24 DIFFERENT STUDIES