Environment

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Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

Financial support for the Enterprise Model Project and Pork Insight has been provided by:



Author(s): SRI, Silsoe Research Institute
Publication Date: January 1, 1995
Reference: Annual Report 1994-1995. Silsoe Research Institute, Wrest Park, Silsoe, Bedford, MK45 4HS. pp. 36-37
Country: United Kingdom

Summary:

Waste engineering in Silsoe covers many different projects related to the reduction of emission and pollution control. This research team is very active and their work is centered on the understanding of the processes involve in emission and pollution.
– Experiments were conducted with a novel Odours and Emissions Chamber (OEC) to collect data on different factors (temperature, wind speed and slurry mixing) affecting emissions. Those data will be used in mathematical models. As an example, they fund that with a wind of 1 to 5 m/s ammonia emissions from exposed pig manure surface can be as high as 3 to 5 g/m2-day. OEC has also been used to measure the methane emissions from the grazing animals’ dung and urine and the highest emissions can be measured for wet, warm and high wind conditions.
– Aerobic treatments of pig manure have also been tested. Except for the pathogen numbers reduction, the continuous treatment is more interesting when it comes to cost, control and consistency. Chemical Oxygen Demand (COD) can be reduced to almost 50% by a 20 days mesophilic (20-40 C) treatments as for a thermophilic (50-60 C) aeration the diminution in COD is not significantly different but this process lead to up to 25% of nitrogen lost as ammonia emissions. Continuous mesophilic treatments or at least 3 days with sufficient aerated regimes enable the nitrification of almost all the ammoniacal nitrogen by conversion to nitrites or nitrates. However 70% of the original nitrogen in the manure can be denitrified and lost emissions of gaseous nitrogen or nitrous oxide when the aeration regime is lower or periodic.
– New techniques have been developed such as a manure analysis by high performance liquid chromatography and for gaseous measurements during denitrification, a mass spectrometric method.
– A stratification treatment process which aerate the manure has been tested and the manure can be recycled for excreta flushing in the swine building resulting in a reduction of the ammonia concentrations by 50%.
– Packing materials have been tested to minimize the cost of biofilter that are used to treat the ventilated air from the animal buildings. The materials are selected considering their good biological performances and the low pressure gradients they produce.

Their research programs are very interesting and cover many aspects of environmental control by studies and treatments on emissions and manure treatments. This research team seems to be well connected to the research made in Europe with their joined projects with other countries.

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