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A study of the capacity of different climatic conditions to oxidise BOD - WA0505

Biochemical oxygen demand (BOD) is a measure of the potential for oxygen removal in surface waters and is a commonly used method for assessing contamination of waters by farm wastes. Evidence for transport or amelioration of BOD from land to surface water following application of farm wastes is conflicting; although there is potential for amelioration of BOD through oxidation during the passage of wastes through or across soils there are also reports of high BOD in field drain discharge and in run-off following slurry application. This study will investigate the processes controlling amelioration or transport of BOD from farm wastes and will examine the fate of BOD following land application. Initially, a review of the relevant literature will be conducted. Experiments will be designed to quantify the extent and rate of BOD reduction/transport and to identify the major factors which influence these processes. Transport of BOD through and across soils will be examined in different soil types under different environmental conditions. Three types of waste (slurry, dirty water and farmyard manure) will be included in the experiments. Consideration will be given to both water soluble and insoluble BOD and appropriate analytical methods will be established. The feasibility of developing a mathematical model describing the processes involved and ability to predict the extent of transport or reduction of BOD will be examined.
Time-Scale and Cost
From: 1993

To: 1996

Cost: £184,912
Contractor / Funded Organisations
Institute of Grassland and Environment Research (IGER)
Fields of Study
Environmental Protection - Agriculture