The Use of Ozone to reduce the Concentration of Malodorous Metabolites in Swine Manure Slurry

Abstract A pilot-scale ozonation system was constructed and operated to reduce the malodours emanating from fresh and stored swine manure slurry. The concentrations of the malodorous bacterial metabolites (phenol, p -cresol, p -ethylphenol and skatole) found in the liquid fraction of the manure slurry were found to increase during three weeks of storage. The fresh and stored manure slurry was ozonated at dosages of 0·25, 0·5, 0·75 and 1·0 g/l. Ozonation eliminated these metabolites from the manure slurry. On the contrary, no useful decrease in the concentration of all the above metabolites was observed after treatment with either nitrogen or oxygen. The odour intensity of the manure slurry was also significantly reduced ( P