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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Oriol Gutierrez
  • Donghee Park
  • Keshab Raj Sharma
  • Zhiguo Yuan

Detail(s)

Original languageEnglish
Pages (from-to)2549-2557
Journal / PublicationWater Research
Volume43
Issue number9
Publication statusPublished - May 2009
Externally publishedYes

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 well-known 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. © 2009 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Alkali, Biofilm, Methane, pH, Sewer, Sulfate, Sulfide

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Effects of long-term pH elevation on the sulfate-reducing and methanogenic activities of anaerobic sewer biofilms. / Gutierrez, Oriol; Park, Donghee; Sharma, Keshab Raj et al.
In: Water Research, Vol. 43, No. 9, 05.2009, p. 2549-2557.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review