Compostagem de resíduo sólido de indústria oleoquímica submetido a três inoculantes

Abstract

One way to reduce the concentration of waste through composting is being considered as an alternative privileged treatment. This study aimed to evaluate the compostability of industrial waste through monitoring of chemical parameters. The experiment was conducted at the Agricultural Sciences College, School of Agronomy, located in Campus II, Universidade do Oeste Paulista UNOESTE in Presidente Prudente/SP. For treatments we used the residue of an industrial company in the oilochemical, properly characterized chemically before the mixtures. The treatments were arranged in compost piles and characterized as follow way: (T1) = Test, (T2) = 75% Proportion of Principal residue + 25% Sewage Sludges (ETE) (3:1), (T3) = Proportion of 50% of the residue Principal + 50% Sewage Sludges (ETE) (1:1), (T4) = 25% Proportion of Principal residue + 75% of Sewage Sludges (ETE) (1:3) , (T5) = 75% Proportion of Principal residue + 25% Mineral Fertilizer (3:1), (T6) = 50% Proportion of Principal residue + 50% Mineral Fertilizer (1:1), (T7) = 25% Proportion of Principal residue + 75% Mineral Fertilizer (1:3), (T8 = 75% Proportion of Principal residue + 25% Farmyard Manure natural; (T9) = 50% Proportion of Principal residue l + 50% Proportion of Principal residue; (T10) = 25% Proportion of Principal residue + 75% Farmyard Manure natural . The samples were dried at 65 ° C for 72 hours, after that it was grinded to determine the following parameters: electrical conductivity (EC) in relation to water, pH CaCl2 0.01 mol L-1, Moisture (%) of the samples removed 65ºC; Relation C/N; Content of Organic Matter (MOT) and total C. The results were submitted to analysis of variance and mean comparison test F at 5% probability, and where relevant treatment effects were evaluated by applying the polynomial regression models. The best model to fit the data was selected based on the significance degree of the coefficient of determination (R²). The data obtained showed that composting is a technique which may be effective in the treatment of waste from the oil industry, which requires the addition of inoculum and nutrients to provide the necessary conditions for microbial activity, the proportion of 25 RI% + 75% of LE. It was considered as a treatment which obtained an important result given the difficult to composting RI, that the period of 120 days was not enough to transform into compost humified and the addition of mineral fertilizer provided no significant effect.