Anaerobic codigestion of agroindustrial effluents: performance evaluation and modeling
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Abstract
Studies that have carried out the anaerobic co-digestion of starch factory effluent with effluent from the animal blood processing agroindustry are unprecedented in the literature. The present study is based on the hypothesis that anaerobic co-digestion can be used for the efficient simultaneous treatment of wastewater from the production of cassava starch and effluent from the processing of cattle and pig blood. Sludge from an anaerobic biodigester applied to the treatment of wastewater from the production of cassava starch was used as an inoculum for the anaerobic co-digestion process. The factors temperature and operating time were controlled, and their effects on the parameters color, turbidity and chemical oxygen demand (COD) were evaluated using a Central Composite Rotational Design (CCRD), consisting of 11 experimental tests. For each response variable, a quadratic mathematical model was generated, validated by Analysis of Variance. The maximum turbidity, color and COD removal efficiency observed in the treatment system was 100%, 90.54% and 68.85%, respectively. A significant effect was observed for the interaction between operating time and operating temperature, when evaluating the COD removal efficiency. The mathematical models were not statistically significant, as for all dependent variables the p-value was higher than the adopted significance level, of 10%. The hypothesis about the possibility of carrying out anaerobic co-digestion of starch factory effluent and animal blood processing effluent was confirmed by the study and is an innovative possibility for the consortium for the treatment of organic waste generated by agro-industrial companies.
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