Journal of Environmental Biology

Studies on methanogenic consortia associated with mangrove sediments of Ennore

Ahila N.K.1, E. Kannapiran¹*, J. Ravindran² and V. Sri Ramkumar³

¹Department of Zoology, Directorate of Distance Education, Alagappa University, Karaikudi ? 630 003, India

²CSIR-National Institute of Oceanography, Biological Oceanography Division, Dona Paula, Goa ? 403 004, India

³Department of Oceanography and Coastal Area Studies, School of Marine Sciences, Alagappa University, Thondi?623 409, India

??????????????????????????????????????????????????????????? *Corresponding Author E-mail: ekannapiran@gmail.com??????

Publication Data

Paper received:

12 December 2012

Revised received:

24 July 2013

Accepted:

19 August 2013

Abstract

In this study, methanogenic consortia were isolated and characterized from eight different sediment samples of mangrove ecosystem located in Ennore, Chennai. Out of eight samples, two consortia (SpR6 and SSS8) were consistent and good at methane production. The maximum methane (6.95%) was produced by the sample collected from the swampy sediments (SSS8) of mangrove environment on 5^th day of incubation. The pure colonies of methanogenic consortia (SSS8) isolated in the roll tube produced maximum methane (5%) on 7^th day. Further, all the isolated consortia produced methane when it was grown with and without gaseous (H₂ and CO₂) substrate, and the maximum production of 15.1% (SSS8) on 12^th day of incubation in the presence of gaseous substrate. Also, the methanogenic consortium isolated from the mangrove environment produced significant amount of methane in tyndallized cow dung (4.7%) than in raw cow dung. The fluorescence of isolated colony and individual cells of methanogenic consortia, methane production, and the amplification of archeal specific 16S rRNA genes confirmed the presence of methanogenic bacteria in the Ennore mangrove sediments. 

 Key words

Biogas, consortia, Methanogenic, Mangrove, Sediment

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