Industrial symbiosis: corn ethanol fermentation, hydrothermal carbonization, and anaerobic digestion.

Abstract:

:The production of dry-grind corn ethanol results in the generation of intermediate products, thin and whole stillage, which require energy-intensive downstream processing for conversion into commercial animal feed products. Hydrothermal carbonization of thin and whole stillage coupled with anaerobic digestion was investigated as alternative processing methods that could benefit the industry. By substantially eliminating evaporation of water, reductions in downstream energy consumption from 65% to 73% were achieved while generating hydrochar, fatty acids, treated process water, and biogas co-products providing new opportunities for the industry. Processing whole stillage in this manner produced the four co-products, eliminated centrifugation and evaporation, and substantially reduced drying. With thin stillage, all four co-products were again produced, as well as a high quality animal feed. Anaerobic digestion of the aqueous product stream from the hydrothermal carbonization of thin stillage reduced chemical oxygen demand (COD) by more than 90% and converted 83% of the initial COD to methane. Internal use of this biogas could entirely fuel the HTC process and reduce overall natural gas usage.

journal_name

Biotechnol Bioeng

authors

Wood BM,Jader LR,Schendel FJ,Hahn NJ,Valentas KJ,McNamara PJ,Novak PM,Heilmann SM

doi

10.1002/bit.24924

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

2624-32

issue

10

eissn

0006-3592

issn

1097-0290

journal_volume

110

pub_type

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