Bio‑digestion and post‑treatment of effluents by bio‑fermentation, an opportunity for energy uses and generation of organic fertilizers from bovine manure

Authors

1 Facultad de Ingeniería en Geología, Minas Petróleos y Ambiental (FIGEMPA), Carrera de Ingeniería Ambiental, Universidad Central del Ecuador, Quito, Ecuador

2 Departamento de Ciencias de la Tierra y la Construcción, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Ecuador

3 Departamento de Biotecnología, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Ecuador

Abstract

Purpose Bio-fermentation has been routed as a viable alternative for the treatment of organic waste, which can provide renewable energy and can return nutrients to the soil with its byproducts. In this context, the objectives of the research were to analyze the benefts that a plastic plug-fow bio-digester can provide for treatment of bovine manure; and through biofermentation to control the E. coli number present in the bio-digester efuents.
Methods The concentration of macronutrients and amount of the E. coli in the efuent was determined by the methods of analysis purposed by APHA standard methods and AOAC standard methods, respectively. In addition, the percentage composition of biogas was analyzed for determining the operative of the system.
Results The production of biogas showed of 52.55% mol of methane concentration which it fed one blowtorch and one kitchenette. The bio-digester efuents showed appreciable amounts of nitrogen, potassium, phosphates, calcium, magnesium and sodium but with E. coli presence; the reason why the bio-digester efuent was treated later by a second fermentation inoculated with mountain efective microorganism, post-treatment which eliminated in 100% E. coli presence.
Conclusion Both processes showed the viability as treatment of the bovine manure which brings renewable energy and efuents with nutritive loads to use it as a biofertilizer without risks to health and humanity. The project was located at the tropical zone into the Choco forest, at an average altitude of 1110 m above sea level and an average temperature annual of 21–22 °C.

Keywords


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