Table
2.
Cost-Effectiveness of Anaerobic Lagoons Relative to Direct Discharge
Swine:
0.027 to 0.11 ha
kg N
96 kg N
head-year
Swine
50.03 to
||content||
.12
5 to
sow
87 kg
head-year
manure slurry
(
||content||
.03 to
||content||
.48kg N)
5 ha
kg
SO.03 to
(0 to
to
||content||
.63
kg
||content||
.11 to .14kg N
25 kg N
head-year
Swine
26 kg
head-year
(
||content||
.12 to .48kg N)
lagoon liquid
kg
+ sludge
||content||
.10 toto .30
kg
||content||
.02 to
||content||
.74 I kg N0.085 to 0.35 ha
head-year
0.46 kg N
1000 birds
6 to
0.45 kg
head-year
(
||content||
.02 to
||content||
.98 kg N)manure slurry
ha
||content||
.02 to
||content||
.75 /kg(2 to
to
||content||
.00
||content||
,294)'
0.10 kg N
head-year
||content||
.08 to 4 kg N0.21 kg
head-year
(
||content||
.10 to .30 kg N)Lagoon liquid
kg
sludge
||content||
.04 to(
||content||
.05 to .19 kgFrom Table
From Table 2-9.
These figures cover the range of agronomic rates for land application. From
et al. (1990).
The numbers in parentheses are presented for comparison purposes and are based on a 1 O-year life
span instead of the SCS life span of 20 years.
Animal Waste Ponds
Animal waste ponds are typically smaller than treatment lagoons and have a
much higher loading rate. In contrast to treatment lagoons, the purpose of an
animal waste pond is to
waste while maintaining as much of the nutrient
content as possible (J. Barker,
Consequently, animal
ponds are
typically used on farms where the fertilizer need is greater than the nutrient load
from the on-farm animal waste. Animal waste ponds also have historically
received low levels of cost-share funding in the Tar-Pamlico basin (Table 2-l).
appears that, in general, animal waste ponds are not an effective or commonly
used practice for decreasing nutrient loads to
waters. We therefore will
not present estimated cost-effectiveness values for animal waste ponds.
24
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