Effects of long-term pH elevation on the sulfate-reducing and methanogenic activities of anaerobic sewer biofilms

Gutierrez, Oriol, Park, Donghee, Sharma, Keshab Raj and Yuan, Zhiguo (2009) Effects of long-term pH elevation on the sulfate-reducing and methanogenic activities of anaerobic sewer biofilms. Water Research, 43 9: 2549-2557. doi:10.1016/j.watres.2009.03.008


Author Gutierrez, Oriol
Park, Donghee
Sharma, Keshab Raj
Yuan, Zhiguo
Title Effects of long-term pH elevation on the sulfate-reducing and methanogenic activities of anaerobic sewer biofilms
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2009-05-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.watres.2009.03.008
Open Access Status
Volume 43
Issue 9
Start page 2549
End page 2557
Total pages 9
Place of publication Oxford, UK
Publisher Pergamon
Language eng
Subject C1
100305 Industrial Microbiology (incl. Biofeedstocks)
960912 Urban and Industrial Water Management
Abstract The dosage of alkali is often applied by the wastewater industry to reduce the transfer of hydrogen sulfide from wastewater to the sewer atmosphere. In this paper the activities of Sulfate Reducing Bacteria (SRB) and Methanogenic Archaea (MA) under elevated pH conditions (8.6 and 9.0) were evaluated in a laboratory scale anaerobic sewer reactor. Compared to those in a control reactor without pH control (pH 7.6 0.1), the SRB activity was reduced by 30% and 50%, respectively, at pH 8.6 and pH 9.0. When normal pH was resumed, it took approximately 1 month for the SRB activity to fully recover. Methanogenic activities developed in the control reactor in 3 months after the reactor start-up, while no significant methanogenic activities were detected in the experimental reactor until normal pH was resumed. The results suggest that elevated pH at 8.6–9.0 suppressed the growth of methanogens. These experimental results clearly showed that, in addition to its wellknown effect of reducing H2S transfer from the liquid to the gas phase, pH elevation considerably reduces sulfide and methane production by anaerobic sewer biofilms. These findings are significant for the optimal use of alkali addition to sewers for the control of H2S and CH4 emissions. A model-based study showed that, by adding the alkali at the beginning rather than towards the end of a rising main, substantial savings in chemicals can be achieved while achieving the same level of sulfide emission control, and complete methane emission control.
Keyword Sulfide
Sulfate
Methane
pH
Alkali
Biofilm
Sewer
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Tue, 23 Jun 2009, 21:23:46 EST by Siona Saplos on behalf of Advanced Water Management Centre