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Ciencia e investigación agraria

versión On-line ISSN 0718-1620


DOS SANTOS, Alexandre L  y  MORA, Freddy. Experimental analysis of flocculant treatments of organic waste from swine production. Cienc. Inv. Agr. [online]. 2007, vol.34, n.1, pp.49-56. ISSN 0718-1620.

Swine production is an important part of the Brazilian agro-industry whose development depends in part on the environmental strategy adopted by the companies involved in the industry. This study examined organic waste treatment experiments from a swine agro-industry located in southern Brazil. Five experiments were conducted that independently considered the following flocculants: Type-1: calcium hydroxide, Type-2: aluminum sulfate + calcium hydroxide, Type-3: calcium hydroxide + dolomite, Type-4: dolomite, and Type-5: aluminum sulfate. All experiments were conducted at the following doses: 0, 1.25, 2.5, 5, 10 and 20 mL. Total solids of the solid fraction (g-nr3) were analyzed in a longitudinal study. A parallel experiment was conducted to compare the treatments at a fixed dose of 20 mL. The analysis was carried out using Generalized Linear Models (GLM) and Generalized Estimating Equations (GEE). These were used because the response variable did not follow a normal distribution; this was confirmed by Shapiro-Wilk test. The Gamma distribution was considered in both GEE and GLM approaches. All equations evidenced a positive effect of the doses on flocculation. Quantity of the total solids was dependent on flocculant type, with values ranging from 8,444 to 21,070 g-rrr3, for Type-1 and Type-2, respectively. No significant differences were evidenced between Type-2, Type-4 and Type-5 flocculants; these all demonstrated higher total solid values. Type-1 and Type-3 flocculants should not be considered for use due to inefficiency. The quantity of biofertilize feasible for production in this swine industry would be dependent on the flocculant type used

Palabras clave : Biofertilizer; flocculants; GEE; GLM; organic swine; quasi-likelihood; waste.

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