Abstract

PARRA-OROBIO, Brayan Alexis et al. INFLUENCE OF pH ON ANAEROBIC DIGESTION OF MUNICIPAL BIO-WASTES. rev.udcaactual.divulg.cient. [online]. 2014, vol.17, n.2, pp.553-562. ISSN 0123-4226.

Municipal bio-wastes-MBW are characterized by their high content of organic matter, humidity, nutrients, and additionally are wastes easily acids, which makes them a source of pollution when are improperly disposed. Anaerobic digestion-AD is a technological alternative for MBW pollution control as well as for methane production as a renewable energy source; however, parameters such as pH can affect the process. This study evaluated at laboratory scale thought Biochemical Potential Methane-BPM assays at a temperature of 30oC during 40 days, the influence of pH on the MBW-AD. The pH values tested ranged from 5.5 to 8.0 units, using as inoculum sludge coming from the sludge anaerobic digestion of a domestic wastewater treatment plant. It was noticed that the acid pH between 5.5 and 6.0 units had the lowest methane production, 70.0 and 71.0mLCH₄*gVS^-1 respectively; while pH values near to the neutrality achieved the best results, being the highest production of methane corresponding to a pH of 7.0 units, reaching a value of 126.0mLCH₄*gVS^-1. Similarly, it was found that pH values from 7.0 to 8.0 units had the best buffer capacity, ensuring stability of the anaerobic process and avoiding inhibition phenomena. To achieve this condition, it is necessary to apply pH adjust due to the acid characteristics of the MBW.

Keywords : Anaerobic biodegradability; biochemical potential methane; buffer capacity; solid wastes.

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