Treatment of livestock manure; air drying and composting poultry manure

Kroodsma, W.

Odour prevention and control of organic sludge and livestock farming Seminar at NIAE, Silsoe, UK, 15-19 April 1985: 166-174


Accession: 001722216

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An in-house drying system on belt batteries, followed by a composting process in a shed outside the stall is described. With the in-house drying system, air from outside is blown through polyethylene tubes mounted underneath the ridge of the poultry house by centrifugal fans. Air is warmed whilst in the tubes by the surrounding stall air of about 22 degrees C. It is then blown into perforated ducts and distributed over the manure on the belts. The diameter of the perforated ducts is important since electrical power consumption depends on ventilation rate and backpressure. The drying process works well with an air movement of 0.4-0.5 msuperscript 3/hen per hour with a backpressure of at least 300 Pa in the perforated ducts. After 5-7 days the manure with a DM content of about 45% is removed from the belts and transferred by transport belts to a storage shed. During storage much of the moisture evaporates by spontaneous internal heating. Although there is some smell during storage in the shed, especially from ammonia, this system produces a dry and crumbly odourless manure with a DM content of 55% or higher. Calculations show that this system of drying manure is economically more advantageous than drying systems with stall storage.