Characterization of the residuals of a dairy
Abstract
Liquid waste products from a dairy farm were characterized. Average total solids concentration amounted 6 676 mg/L; out of them, total solute solids constituted 64,53% with non-volatile solute solids prevailing in 60,68% while volatile solute solide accounted for 39,32%. On the other hand, total suspend solids (2 219 g/m3 ) constituted 33,57% with non-volatile suspended solids reaching 47,25% and volatile suspended solids, 52,75%. Organic matter content in liquid waste products was 44,6%. Residual water showed an average oxygen chemical demand of 48,25 g/m3 pointing out its highly pollutant power. Alkalinity was also high, amounting 1384 g/m3. Average total nitrogen was 316 g/m3, and total phosphorus was 27 g/m3 .Average pH was 8 rangin between 7,6 and 8,3. Except pH, all values for residual water spill are over the limit set by the Cuban Technical Standarts (27 in 1999); therefore, residual waters must be treated or surface water pollution can occur. It is evident that specific waste products characteristics must be determined to effectively assess their pollutant power as well as the methods that should be applied for their treatment.
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