Authors: Cassidy, D. P; Hirl, P. J; Belia, E

Source: Water Environment Research, Volume 80, Number 6, June 2008 , pp. 570-575(6)

Publisher: Water Environment Federation

Abstract:

Methane production from the soluble fraction of distillers' dried grains with solubles, a co-product of ethanol production, was studied in 2-L anaerobic sequencing batch reactors (ASBRs) under 10 different operating conditions. Methane production and chemical oxygen demand (COD) removal were quantified for a wide range of operating parameters. Chemical oxygen demand removals of 64 to 95% were achieved at organic loading rates ranging from 1.5 to 22.2 g COD/L · d, solids retention times from 8 to 40 days, and food-to-microorganism ratios ranging from 0.4 to 1.9 g COD/g volatile suspended solids (VSS) · d. Biogas methane content varied from 61 to 74%, with 0.29 L CH ₄ produced/g COD removed. Roughly 56% of the influent COD and 84% of the COD removed in the ASBRs was converted to methane. Microbial yield ( Y) and decay ( b) constants were determined to be Y = 0.126 g VSS/g COD removed and b = 0.032 day ⁻¹, respectively. Methane produced from co-products can reduce the costs and fossil-fuel consumption of ethanol manufacture.

Keywords: anaerobic; anaerobic sequencing batch reactor; biogas; ethanol; methane; distillers' dried grains with solubles

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143007X221517

Publication date: 2008-06-01

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