Authors: D Hidalgo M Gómez J M MartínMarroquín A Aguado E Sastre
Publish Date: 2014/04/09
Volume: 12, Issue: 5, Pages: 1727-1736
Abstract
The purpose of this work was to study the anaerobic codigestion of all the byproducts generated during the processing of used vegetable oils UVO with the objective of proposing a solution for the treatment of these wastes More specifically this study investigates the advantages of twophase anaerobic digestion for treating a mixture 1/5 v/v of UVO processing wastes OW and pig manure PM using two semicontinuous digesters operated at mesophilic temperature 37 ± 1 °C The experiments were conducted at hydraulic retention time HRT of 05 1 2 and 4 days in the first stage acidifier and at HRT of 115 15 18 and 20 days in the second stage methaniser The results revealed that the HRT had a high influence on the soluble chemical oxygen demand sCOD and total dissolved solids TDS removal The maximum total sCOD removal efficiency of 864 and TDS removal efficiency of 819 was achieved at 20 days of global HRT The maximum biogas production of 065 m3 per kilogramme of volatile dissolved solids VDS was removed corresponding to a methane production of 042 m3 CH4 kg−1 VDS removed 65 CH4 was also achieved at 20 days of HRT The twophase digestion system showed good stability which was mainly attributed to the strong buffering capacity with the twophase system and the high alkalinity from PM when codigested with OW The results obtained from this study provide fundamental information for scaling up a highperformance twophase anaerobic system in the future
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