BIOGAS PRODUCTION FROM INSTANT COFFE EWASTE WATER

PRODUCCION DE BIOGAS A PARTIR DE LAS AGUAS RESIDUALES DE CAFÉ INSTANTANEO

Abstract

The purpose of this research work was to demonstrate the production of biogas generated by an anaerobic digestion of the wastewater produced by the instant coffee processing industry, since due to the production of this product high volumes of wastewater are obtained, finding in its composition recalcitrant compounds. One of the possible alternatives in the treatment of recalcitrant effluents is the application of advanced oxidative processes (POA), influencing the reduction of chemical oxygen demand (DQO) and total organic carbon; the substrate of the synthetic instant water of instant coffee is evaluated by the biochemical potential of methane (BMP) as the main component in the generation of biogas. The inoculum was characterized in terms of suspended volatile solids. The biochemical potential of methane was carried out at mesophilic and thermophilic temperatures (35 ºC and 55 ºC) with organic loads of 0.1; 0.2; 0,35 and 0,5 gDQO / gSSV with the presence of tannins and in organic loads of 0,2 and 0,35 gDQO / gSSV with removal of tannins, both during a period of 25 days; the residual water of instant coffee used showed DQO concentrations that ranged between ≥4000 mg / L and ≥4478 mg / L, applying an inoculum from an anaerobic reactor of the fish industry EUROFISH. The processes were monitored through parameters such as DQO, DBO, SSV, pH, temperature and methane yield, showing different behaviors in the degradation of organic matter according to the loads applied.