Methane production from ethanol co-products in anaerobic SBRs

Author:

Cassidy D. P.1,Hirl P. J.2,Belia E.3

Affiliation:

1. Department of Geosciences, Western Michigan University, Kalamazoo, MI 49008, USA E-mail: daniel.cassidy@wmich.edu

2. Stanley Consultants, 5775 Wayzata Blvd., Suite 955, Minneapolis, MN 55416, USA E-mail: hirlpat@stanleygroup.com

3. Primodal, Inc., 122 Leland St., Hamilton, Ontario L8S 3A4, Canada E-mail: belia@primodal.com

Abstract

Methane production from condensed distillers' solubles (CDS, or syrup), a co-product of ethanol production, was studied in 2-l anaerobic sequencing batch reactors (ASBRs) under 10 different operating conditions. Methane production and COD removal were quantified under steady state conditions for a wide range of operating parameters. COD removals of 62–96% were achieved at OLRs ranging from 1.5–22.2 g COD l−1 d−1, SRTs from 8–40 d, and F/M ranging from 0.37–1.95 g COD g−1 VSS d−1. The methane content of the biogas varied from 57–71% with 0.27 l CH4 produced per g of COD removed. Approximately 54% of the COD fed to the ASBRs, and 83% of the COD removed in the ASBRs was converted to methane. Microbial yield (Y) and decay (b) constants were determined to be approximately Y = 0.127 g VSS g−1 COD removed and b = 0.031 d−1, respectively. Methane recovery from ethanol co-products can reduce the cost and the fossil fuel consumption of ethanol production.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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