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`To reduce odour emmision through identification of livestock housing, slurry store and land-spreading` - WA0201

WA0201, WA0202 & WA0211. Livestock wastes: reduction of pollution and odour

This study (which comprises WA0201, WA0202 and WA0211) will aim to devise economically viable methods for the treatment, storage and handling of farm wastes, so that they do not pollute water courses or cause a nuisance due to odour. Attempts will be made to reduce aerial pollution from agricultural buildings and odours from intensive broiler housing systems. Factors influencing ammonia and odour emissions during storage of manures and slurries will be investigated; a series of pilot slurry stores will be monitored under a range of treatments and effects of storage time, frequency of loading and regular mixing will be evaluated. Novel methods of application of manures and slurries to agricultural land will be developed to reduce ammonia and odour emissions; a series of spreading techniques will be assessed to determine optimum rates of application, dry matter content of the slurry and the influence of evenness of spread. The root zone method, which exploits the ability of reeds to sustain a layer of oxygenated water around their root system, will be assessed for treatment of effluents. Factors influencing infiltration and water pollution from dilute farm effluents will be investigated, following application of the effluents to grassland growing on 4 different soil types; the information obtained will be correlated to soil types and used in conjunction with the soils database to improve site selection. Stratified aeration and flushing of separated pig slurry will be examined for control of odour emissions and pollution; methods for establishing aerobic conditions in the top metre of an above ground 4 metre deep pig slurry store will be investigated, experiments will be conducted to determine the efficiency and impact on odour of flushing of excreta from slurry channels, and effects of ambient temperature and climatic variables on the efficacy of treatment and flushing systems will be evaluated. In addition, long-term impacts of livestock slurry on steel corrosion will be studied, together with treatments to inhibit such corrosion and methods for predicting the design life of steel slurry stores. It is anticipated that this study will lead to an improved understanding of the ways in which animal wastes can be stored and disposed of, in order to reduce odour and pollution of the environment.
Time-Scale and Cost
From: 1991

To: 1993

Cost: £342,000
Contractor / Funded Organisations
Fields of Study
Environmental Protection - Agriculture