Influence of the Ratio IA/PA and Volatile Acids in the Monitoring of UASB Reactor in the Treating of Swine Waste Water
- 1 Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- 2 Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- 3 Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- 4 Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- 5 Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Abstract
This paper presents the influence of the ratio IA/PA and concentration of volatile acids (TVA) in the operational stability of a UASB reactor treating swine waste water. The treatment system in real scale was constituted of decanter, followed by the UASB reactor with volume of 7.4 m 3 and 11.5 m 3 , respectively. It has been observed a large oscillation of the ratio IA/IP in the UASB reactor with an average value of 0.39, and average efficiency of removal of BOD and COD of 79.8 and 79.3%, respectively, at the start, dropping to 0.12 in the continuity of the experiment, including during overload, in which the removal efficiencies of COD and BOD reached values below 10%. The TVA average values were 913 mg·L - 1 in the UASB reactor, increasing considerably in the overload period, reaching values higher than 4500 mg·L - 1 , indicating an accumulation of volatile acids and reduced efficiency of the UASB reactor in removal of organic matter. We conclude that the monitoring of the values of the ratio IA/PA and TVA is very useful instruments and easy to determine in the monitoring of the UASB reactor, enabling to predict possible instabilities in the reactor, allowing corrective actions in a timely manner.
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