H2S
Control for Liquid Manure Storage Practices - Impermeable
Covers
| Pro |
Con |
| Traps multiple gases, dust and odor |
Need replacing over time (5-10 years) |
| Cost-efficient as a post-excretion strategy |
Planning for snow load, wind effects |
Covering a manure storage area with an impermeable
cover prevents the release of gases into the atmosphere, and eliminates
the effects of wind and radiation on emission rates. Although documented
effectiveness for reducing hydrogen sulfide emissions is not available,
impermeable covers are used to block any gas transfer, suggesting
that emission reductions should be high and similar to those observed
with odor (70 to 85 percent). Polyethylene covers typically range
in price from $1.00 to $1.40 per square foot, installed.
Wind and snow-load damage present the greatest
challenges with respect to implementation of the extended use of
impermeable covers. Damage due to weather alters the life of the
cover, impacting the capital investment required over time. Many
manufacturers list a useful life of 10 years for storage areas constructed
to prevent snow accumulation on the cover, but do not provide any
guarantee against wind damage.
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