Relação entre carbono, nitrogênio e fósforo para tratamento aeróbio de efluente da produção de ácido caproico

Abstract

The effluent from the anaerobic production of hexanoic acid, a product used in the most diverse economic sectors and with a high value added, generated from the anaerobic digestion in reactors that use ethanol and acetic acid as substrate is still little studied, and it is necessary to search for more efficient technical forms to treat this effluent and minimize negative impacts on the environment and on the health and well-being of the population. In this context, it was sought to determine the best nutrient (nitrogen and phosphorus) ratio associated with carbon for a better efficiency in the aerobic biodegradation of the effluent. Therefore, the effluent was characterized, and then it was assembled six batch reactors, being three replicates, in bench scale, aerated and with different carbon: nitrogen: phosphorus ratios of 100: 20: 1; 100: 10: 1 and 100: 5: 1. 52.2 mL of acclimated sludge (2500 mg SSV / L) and 247.8 mL of crude effluent were introduced into the reactors, totaling a useful volume of 300 mL in the reactor. The hydraulic detention time was of five days and it was observed that the efficiencies of organic matter removal varied between 93% and 99%, Noting that the ratio 100: 05: 01 was the best, in this work, for the removal of organic matter.