Análisis experimental de tratamientos floculantes de residuos orgánicos derivados de la producción porcina

Abstract

A.L. dos Santos, and F. Mora. 2007. Experimental analysis of fl occulant treatments of organic waste from swine production. Cien. Inv. Agr. 34(1):49-56. 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 fl occulants: 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⋅m -3 ) were analyzed in a longitudinal study. A parallel experiment was conducted to compare the treatments at a fi xed 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 confi rmed by ShapiroWilk test. The Gamma distribution was considered in both GEE and GLM approaches. All equations evidenced a positive effect of the doses on fl occulation. Quantity of the total solids was dependent on fl occulant type, with values ranging from 8,444 to 21,070 g⋅m -3 , for Type-1 and Type-2, respectively. No signifi cant differences were evidenced between Type-2, Type-4 and Type-5 fl occulants; these all demonstrated higher total solid values. Type-1 and Type-3 fl occulants should not be considered for use due to ineffi ciency. The quantity of biofertilize feasible for production in this swine industry would be dependent on the fl occulant type used.