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Influence of inoculum activity on the bio-methanization of a kitchen waste under different waste/inoculum ratios

Paper ID Volume ID Publish Year Pages File Format Full-Text
36735 45146 2004 6 PDF Available
Title
Influence of inoculum activity on the bio-methanization of a kitchen waste under different waste/inoculum ratios
Abstract

The use of a granular inoculum prevented acidification during the anaerobic batch biodegradation of a kitchen waste for waste/inoculum ratios in the range of 0.5–2.3 g VS/g VS, when the alkalinity/COD ratio was 37 mg NaHCO3/g COD. In similar experiments but using a suspended sludge with a significantly lower activity, the methane production rates and the biodegradability were significantly lower and the pH decreased below 5.5 at the waste/inoculum ratio of 2.3 g VS/g VS. When the added alkalinity was decreased to 2 mg NaHCO3/g COD, the ratio waste/inoculum was clearly more important than the inoculum activity, since, irrespective of the sludge used, acidification occurred at waste/inoculum ratios higher than 0.5 g VS/g VS. The advantage of using granular sludge was further investigated in order to define reasonable condition of waste/inoculum ratio and added alkalinity that could be applied in practice. For a waste/inoculum ratio of 1.35, there were no significant differences between the results obtained for the biodegradability and maximum methane production rate (MMPR), when the alkalinity decreased from 44 to 22 mg NaHCO3/g COD.

Keywords
Anaerobic bio-methanization; Granular sludge; Suspended sludge; Kitchen waste; Waste/inoculum ratio; Alkalinity
First Page Preview
Influence of inoculum activity on the bio-methanization of a kitchen waste under different waste/inoculum ratios
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 39, Issue 12, 29 October 2004, Pages 2019–2024
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering