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Comparison of CSTR and UASB reactor configuration for the treatment of sulfate rich wastewaters under acidifying conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
17653 42687 2008 9 PDF Available
Title
Comparison of CSTR and UASB reactor configuration for the treatment of sulfate rich wastewaters under acidifying conditions
Abstract

The effects of lowering the operational pH from 6 to 5 on mesophilic (30 °C) sulfate reduction during the acidification of sucrose at an organic loading rate of 5 gCOD (lreactor d)−1 and at a COD/SO42− ratio of 4 were evaluated in a CSTR and in a UASB reactor. The HRT was 24 h and 10 h, respectively. Acidification was complete in both reactors at pH 6 and the lowering of the operational pH to 5 did not affect the acidification efficiency in the CSTR but decreased the acidification efficiency of the UASB to 72%. The decrease to pH 5 caused an increase in the effluent butyrate and ethanol concentrations in both reactors. Lowering the pH from 6 to 5 caused a decrease in sulfate reduction efficiencies in both reactors, from 43% to 25% in the CSTR and from 95% to 34% in the UASB reactor. The acidification and sulfate reduction efficiencies at pH 5 could be increased to 94% and 67%, respectively, by increasing the HRT of the UASB reactor to 24 h.

Keywords
Acidification; Sulfate reduction; Two-phase anaerobic treatment; Low pH; CSTR; UASB
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Comparison of CSTR and UASB reactor configuration for the treatment of sulfate rich wastewaters under acidifying conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 43, Issue 7, 10 December 2008, Pages 471–479
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