Treatment of cattle wastewater with UASB reactor operated at mesophile temperature: new approaches for the bioenergy sector

Keywords: Anaerobic digestion, Biogas, Methane, Pollution control, Bioenergy

Abstract

Engineering methods should be constantly updated to promote constructive, economic, and sustainable improvements. In this work, new data on energy valorization and treatment of cattle wastewater through a UASB reactor operated at 40°C has been obtained. A semi-continuous feeding regime was applied, with hydraulic retention times of 6, 5, 3, and 2 days, and organic loading rates of 4, 5, 7, and 11 kg COD m-3 d-1. Gas volumes of up to 1.5 m³ biogas m-3 reactor d-1, with methane concentrations ranging between 69% and 75%, were recorded. Organic matter removals of 60-80% (total COD) and 50-75% (soluble COD) resulted in methane yields of 0.16-0.18 m³ CH4 kg-1 total COD and 0.4-0.5 m³ CH4 kg-1 soluble COD. No accumulation of volatile fatty acids was observed at any stage, and the pH and alkalinity values remained within the ideal range for the development of the anaerobic digestion process. The UASB reactor demonstrated significant biogas production and reasonable removal efficiency of solids and organic matter, indicating it as a new option for high concentration of pollutants treatment with the benefit of clean energy production.

Author Biographies

Henrique Vieira de Mendonça, Universidade Federal de Juiz de Fora
Graduação em Engenharia Agrícola e Ambiental pela Universidade Federal de Viçosa (2008), Graduação em Ciências Biológicas pela UNINCOR (2014). Mestre em Ecologia Aplicada ao Manejo e Conservação de Recursos Naturais pela Universidade Federal de Juiz de Fora (2011). Doutorando em Ecologia Aplicada ao Manejo e Conservação de Recursos Naturais pela Universidade Federal de Juiz de Fora - Departamento de Biologia/Programa de pós graduação em Ecologia (PGECOL).
Aderson Gomide Costa, UFRRJ
Engenheiro Agrícola formado em Dezembro de 2009 pela Universidade Federal de Lavras. Possui mestrado em Engenharia Agrícola com ênfase em máquinas e automação agrícola pela da Universidade Federal de Lavras (2011) e doutorado em Engenharia Agrícola na área de máquinas e mecanização agrícola pela Universidade Federal de Viçosa (2015). Atualmente é professor adjunto do quadro efetivo da Universidade Federal Rural do Rio de Janeiro vinculado ao departamento de Engenharia, atuando na área de máquinas agrícolas e agricultura de precisão. É docente permanente e Coordenador do Programa de Pós-graduação em Engenharia Agrícola e Ambiental da Universidade Federal Rural do Rio de Janeiro. Desenvolve pesquisas nas áreas de máquinas e implementos agrícolas, agricultura de precisão, visão artificial de máquinas, processamento de imagem e biospeckle laser.
Jacob Santana, UFRRJ
Estudante de mestrado em engenharia agricola e aambiental.
Mônica Silva dos Santos, UFRRJ
Docente de Mestrado em Engenharia Agrícola e Ambiental da UFRRJ, Seropédica (RJ), Brasil.

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Published
2024-07-05
Section
Environment