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Abstract
A study was conducted to test the efficiency of electrolytic treatment in the control of odourous substances of stored swine slurries. For this purpose, a pair of copper electtrodes were placed, at a distance of 50 m from each other, in a pit (50×5.4×2.0 m) containing 540 m3 of diluted swine slurries (31 g/L COD, 1–2% TS). Every 10 minutes, alternate current (intensity 1,498 mA, maximum density 136,4 mA/dm2) was applied for 90 days. Results showed that a better control of odours was obtained with electrolytic treatment than with storage only (final cooncentration: 73 and 111 T.O.N., respectively). After electrolytic treatment a decrease of ATP content was associated with odour reduction, a lower N‐NH3 concentration (78% versus 89%) and the absence of crust formation on the surface. No relationship was found between the number of microorganisms and odour reduction.