Bioethanol Manufacturing Wastewater

  • Author: ChemistryViews
  • Published: 21 February 2012
  • Copyright: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Environmental Science and Technology/ACS
thumbnail image: Bioethanol Manufacturing Wastewater

Bioethanol manufacturing generates large volumes of high-strength wastewater, mainly from the distillation process. On average, 8−15 L of distillery wastewater (DWW) are generated for each liter of ethanol produced. DWW is characterized by its extremely high chemical oxygen demand (COD), typically 80−100 g/L, its dark brown color and a high sulfate concentration of 1.3−3.7 g/L. Due to the high temperature of the distillation process, the temperature of the wastewater stream is typically 70 − 80 °C. The high COD content offers the potential for energy recovery.


In Seop Chang, Gwangju Institute of Sciences and Technology (GIST), Korea, and colleagues accomplished a simultaneous electricity generation and distillery wastewater (DWW) treatment using a thermophilic microbial fuel cell (MFC). Thermophilic MFCs require less energy for cooling the DWW and can achieve high efficiency for electricity generation and also reduce sulfate along with oxidizing complex organic substrates. The generated current density of 2.3 A/m2 and power density of up to 1.0 W/m2 were higher than previous wastewater-treating MFCs.


They explored the bacterial diversity in a thermophilic anode biofilm, along with the inoculum, using pyrosequencing of the bacterial 16S rRNA gene amplicon, which gave reads long enough (≈400 bp) to identify bacteria at the species level.
Despite the complexity of the DWW, one single bacterial sequence (OTU D1) close to an uncultured Bacteriodetes bacterium became predominant, up to almost 40 % of total reads. The proliferation of the species was concurrent with high electricity generation and high Coulombic efficiency.


Article Views: 2635

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH