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... sloan uksaturated. To reduce pollution of streambeds, access to the stream can be restricted to stable stream crossings and access points.
The primary goal of all waste treatment is to eliminate human pathogens. A secondary goal is to reduce the biochemical oxygen demand (BOD--the carbon and nutrient substrate for microbial decomposition) so that the waters that receive waste runoff do not become anaerobic. Finally, some heavy metals must be removed before the waste is discharged.
In a sewage treatment plant loan uk for human waste, commercial loan aerobic decomposition kills human pathogens and reduces the BOD while the settling process removes heavy metals to sludge which then must be safely disposed of.
One reason the concept of diminishing returns should be a powerful deterrent to large CAFOs is that the cost of responsibly handling and treating loan uk animal waste is so high.
Anaerobic decomposition in animal waste lagoons is less effective at eliminating homeowner loan human pathogens and BOD, and it leaves heavy FirstPart metals in the lagoon. As opposed to assumptions about its natural and thus, harmless, nature, livestock manure creates pollution with a strength that far exceeds raw municipal sewage. As Table II-1 shows, the BOD loan uk concentration in undiluted livestock waste is 160 times more powerful than raw municipal sewage and ammonia is 200 times more concentrated. Even after it has been flushed to lagoons, manure effluent is car loan still 57 times more powerful than raw sewage.
Table II-1.
Pollution strength of livestock and municipal waste
Type of Waste BOD5 Ammonia, NH4N
mg/l mg/l
Exposure of land-applied wastes to sunlight and microbial activity in the soil loan uk will generally finish the job of pathogen control, and the nutrients that affect BOD may be used by crop plants. In effect, application to farm land is a final step in the "treatment" of animal waste if the amount of land to which it is applied is sufficient to perform this function. The need to apply animal waste from CAFOs to the land to destroy human pathogens in the waste exists whether or not methane is generated from the waste to create power. This, in loan uk turn, requires the construction of lagoons to hold the effluent until it can be applied to the land.
All of this implies that the dairy CAFO has enough land for responsible nutrient application, and it further implies loan uk that the number of animals at the dairy has been decided based on the amount of spreadable acreage available--and not vise-versa. It also implies a climate that is mild enough to allow year-round application, or sufficient, leak-free lagoon capacity to see the CAFO through the winter months. In sum, the requirement to car loan spread the waste to kill pathogens creates a significant decision point in the loan uk best loan ability of the CAFO to responsibly handle waste.
Securing the amount of spreadable acreage loan uk required by a CAFO is usually a daunting task.
If the CAFO is secured loan located in areas where the climate is unfavorable for waste application for major parts of the year or where the soil is so poor that few crops are grown and little spreading can occur, spreading the waste on the land may simply be impractical. Many CAFOs have realized this and their response has been to simply put the waste in large lagoons until the liquid evaporates. This creates two major problems: first, lagoons leak and lagoon storage does loan uk nothing to destroy the pathogens in the waste. And second, the materials in the waste--nitrogen, phosphorus, heavy metals, and salts--are concentrated in pits for which there are usually no remediation plans even though they would FirstPart qualify as hazardous waste dumps based on the chemical makeup of the materials.
No matter what collection system is in place, 100 percent of excreted manure is seldom recovered due to physical losses on the farm. A recent survey of Midwest confinement livestock farms, NRCS indicated that percentages of manure (feces and urine) recovered was eighty percent for lactating dairy cows, but only sixty percent for other animals on the dairy farm. best loan Grazing commercial loan animals will distribute the majority of their manure within the pasture system, so recovery for field application is not necessary, but manure is recoverable inside loafing barns, milking barns, and feeding areas.
(a) Manure output and milk production
One of the major factors loan uk contributing to animal manure output and composition is the feeding regimen and digestibility of the feed nutrients.
A good example would be the changes in a typical lactation of a dairy cow. Daily and annual excretion estimates of various fractions and nutrients by Holstein dairy cows are shown in Table II-2. This ex ... |
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