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Low pH (6, 5 and 4) sulfate reduction during the acidification of sucrose under thermophilic (55 °C) conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
36012 45118 2007 12 PDF Available
Title
Low pH (6, 5 and 4) sulfate reduction during the acidification of sucrose under thermophilic (55 °C) conditions
Abstract

The effect of a low pH (6, 5 and 4) and different COD/SO42− ratios (9 and 3.5) on thermophilic (55 °C) sulfate reduction and acidification of sucrose was investigated using three upflow anaerobic sludge bed reactors fed with sucrose at an organic loading rate of 3.5 gCOD (lreactor d)−1. The three reactors showed nearly 100% acidification of sucrose for all pH values and COD/SO42− ratios investigated. Sulfate reduction was complete at pH 6 and a COD/SO42− ratio of 9. At pH 5, sulfate reduction efficiencies were 80–95% for both COD/SO42− ratios (9 and 3.5). At pH 4, sulfate reduction efficiencies further dropped to 55–65% at a COD/SO42− ratio of 9 and 30–40% at a COD/SO42− ratio of 3.5. The pH decrease from 6 to 5 or 4 caused a shift in the acidification products from mainly acetate to butyrate, as well as a higher production of ethanol, especially at pH 4. At pH 4, propionate and methane were not formed and hydrogen concentrations in the biogas reached 50%, equivalent to a hydrogen yield of 1.3 mol H2 (mol glucose)−1. This study shows that sulfate reduction is possible in the acidification phase of anaerobic wastewater treatment at pH values as low as 6 till 4 and that the pH strongly affects both the acidification pathways and the sulfate reduction efficiencies.

Keywords
Acidification; Low pH; Thermophilic; Sulfate reduction; Anaerobic; UASB
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Low pH (6, 5 and 4) sulfate reduction during the acidification of sucrose under thermophilic (55 °C) conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 4, April 2007, Pages 580–591
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