Please use this identifier to cite or link to this item: http://hdl.handle.net/1946/22415
An experimental study with pulsed electric field (PEF) pre-treatment was conducted to investigate its effect on methane production. PEF pre-treatment converts organic solids into soluble and colloidal forms increasing bioavailability for anaerobic microorganisms participating in methane generation process. The substrates tested were pig slurry (PS), landfill leachate (LL) and fruit/vegetables (FV). Operating parameters were varied from 15 to 50 kWh/m3 to show the influence of treatment on methane production via the biochemical methane potential test. The results indicate that the methane production and chemical oxygen demand (COD) removal was improved by the PEF pre-treatment. Continuous escalation of applied intensity, up to 50 kWh/m3, contributed to increasing methane production of PS up to 58% over the control, after 22 days. Threshold treatment intensity of 30 kWh/m3 was found for LL beyond which the methane production was enhanced linearly with increase in intensity. When PEF treatment exceeded the threshold, methane production of the LL increased up to 44% after 22 days. The result of the PEF pre-treatment on FV showed that 16.3 kWh/m3 was the intensity by which the highest enhancement in methane production (7%) was achieved after 41 days. Beyond this intensity, the methane production decreased. COD removals were increased up to 53%, 100% and 17% for PS, LL and FV, respectively, compared to the control. Results indicate that the treatment intensity has a significant effect on the methane production and biosolid removal. Therefore, it has to be chosen with respect to the substrate.
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