Evaluación de la eficiencia de la producción de biogás a partir de lodos y grasas residuales de la industria Tecopesca mediante codigestión anaeróbica

Abstract

The Tecopesca WWTP sewage sludge has a final disposal in vacant lots, this sludge contains a NaCl inherent concentration of 13,82 g/L; causing soil salinization. To avoid this problem, it was proposed to evaluate the biogas production from residual sludge and fats by anaerobic co-digestion process, for its stabilization and energy potential determination. To evaluate the inoculum specific methanogenic activity (SMA) and the KI50 from the inoculum, this essay was carried out in biodigesters the biodigesters contained inoculum, a model substrate and NaCl. Also, biodigesters of 100 mL with different concentrations of substrates were developed for the biomethanization potential (BPM), the BMP test lasted 57 days. The results showed that the NaCl inherent concentration of the inoculum and substrates does not affect significally the biogas production, however, the medium acidification and the VFAs production decrease the biogas production. The anaerobic co-digestion between sludge and fats benefits the biogas production, increasing it in almost 3 times than the sludge digestion only, and reduces the VS concentration up to 99 %. However, the biogas content is not enough to generate electricity or to be used as a heat source.