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Engenharia Sanitaria e Ambiental

Print version ISSN 1413-4152On-line version ISSN 1809-4457


RIBAS, Maria Magdalena Ferreira; MORAES, Elizabeth de Mattos  and  FORESTI, Eugenio. Evaluation of the accuracy of several methods for determination of volatile fatty acids and bicarbonate alkalinity for the monitoring of anaerobic reactors. Eng. Sanit. Ambient. [online]. 2007, vol.12, n.3, pp.240-246. ISSN 1413-4152.

Anaerobic treatment systems are sensitive to the environmental condition changes. Such changes may have influence on the metabolism of the microorganisms responsible for the process stability. The aims of this work were (i) to evaluate the accuracy of methods to determine control parameters volatile fatty acids (VFA) and bicarbonate alkalinity (BA) in samples prepared with concentrations from 50 to 1000 mg/L and, (ii) to verify different procedures of the CO2 removal formed during the acid titration of the samples. From the Tukey statistical test applied to the obtained results it was observed that the Kapp and DiLallo & Albertson methods using sonic equipment to remove CO2 from the liquid presented better results for VFA. The Conductivity, Kapp and Jenkins methods were considered the most reliable for BA determination.

Keywords : Volatile fatty acids; bicarbonate alkalinity; anaerobic digestion; conductivity; monitoring parameters.

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