day. For total phosphate
the reduction is 54 or 0.392 lb N per thousand
pounds of live bird weight per day.
In Section 18.104.22.168, we estimated the effectiveness (load reduction per head)
with conversion from direct discharge of wastes to land application at
agronomic rates (Table 2-6). The load reduction depended greatly upon whether
that waste being discharged was manure slurry or lagoon effluent. The major
difference between the two waste types IS that the overall nutrient content of fresh
manure (per head) is much higher than that of the lagoon liquid and sludge.
Therefore, the mass reduction achieved by land application of the fresh manure is
higher as well.
For the direct discharge scenario, the calculations for lagoon effectiveness (not
cost-effectiveness) are the same as those for land application. This is because
the pre- and post- scenarios are the same. Before the
wastes are discharged directly to the stream. After the cost-sharing, lagoon liquid
and sludge are land-applied at agronomic rates. We assume that after the
lagoon is cost-shared, the operator will land-apply the effluent at agronomic rates
without additional cost-share funds for land application. The effectiveness values
from Table 2-6 are presented again for lagoon cost-sharing in Table 2-l I