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Improving biogas production from protein-rich distillery wastewater by decreasing ammonia inhibition

Paper ID Volume ID Publish Year Pages File Format Full-Text
34611 45035 2013 7 PDF Available
Title
Improving biogas production from protein-rich distillery wastewater by decreasing ammonia inhibition
Abstract

•We investigated the effect of recirculation of water-washed biogas.•Biogas recirculation into liquid phase was better for biogas production.•The removal mechanism of NH3 by biogas recirculation was discussed.•High OLR was obtained by combination of C/N ratio adjustment and NH3 removal.

A large quantity of protein-rich distillery wastewater is produced during the process of bio-ethanol production from kitchen waste. It is difficult, however, to treat protein-rich distillery wastewater by anaerobic digestion due to ammonia inhibition. In this study, a novel method was investigated to reduce ammonia inhibition during thermophilic anaerobic digestion through the recirculation of water-washed biogas into the headspace (R1 system) or liquid phase (R2 system) of the reactors. The results show that the method greatly improved biogas production from distillery wastewater. R2 system achieved stable biogas production at a higher organic loading rate (OLR) of 4.0 g VTS/L/d than R1 system at 3.0 g VTS/L/d. At the same OLR, we observed a higher biogas production rate but lower accumulation of NH4+ and volatile fatty acids in the reactor, and higher ammonia absorption rate in the water tank of R2 system than R1 system. The better performance of R2 system could be attributed to the more efficient removal of ammonia from liquid phase. In addition, adjusting the C/N ratio of distillery wastewater from 9.0 to 11.4 significantly enhanced the maximum OLR from 3.0 to 7.0 g VTS/L/d in R1 system.

Keywords
Anaerobic digestion; Distillery wastewater; Ammonia inhibition; Biogas recirculation; Kitchen waste treatment
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Improving biogas production from protein-rich distillery wastewater by decreasing ammonia inhibition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 48, Issue 11, November 2013, Pages 1778–1784
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us