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Anaerobic protozoa and their growth in biomethanation systems

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Abstract

This study was to investigate growth of protozoa and its influence on biodegradation in anaerobic treatment systems. It was done by specifically controlling and monitoring growth of protozoa versus degradation in continuous stirred anaerobic reactors and batch anaerobic reactors. Occurrence of a diverse protozoa population such as the ciliates, Prorodon, Vorticella, Cyclidium, Spathidium, Loxodes, Metopus were observed in stable anaerobic systems and the flagellates, Rhynchomonas, Naeglaria, Amoeboflagellates, Tetramitus, Trepomonas and Bodo during increased VFA concentration and affected periods of biomethanation. The abundance of ciliates in the anaerobic system had significant correlation with the reduction of MLSS, increased rate of COD removal and higher methane production. The results of this study thus tend to relate increased anaerobic degradation with the abundance of protozoa, mainly ciliates, which indicate their possible involvement in the process. Present study also reveals that performance of anaerobic process can be assessed by monitoring the protozoa population in the system.

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Abbreviations

CSTAR:

Continuous stirred tank anaerobic reactor

COD:

Chemical oxygen demand

MLSS:

Mixed liquor suspended solids

VFA:

Volatile fatty acids

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Acknowledgements

Priya, M. gratefully acknowledges the financial assistance from UGC, Govt. of India in the form of research fellowship (Award No: F 15-6 (dec/2001)/2002(NET).

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Authors and Affiliations

  1. Process Engineering and Environmental Technology Division, Regional Research Laboratory, CSIR, Thiruvananthapuram, 695019, India

    M. Priya, Ajit Haridas & V. B. Manilal

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  1. M. Priya
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  2. Ajit Haridas
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  3. V. B. Manilal
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Correspondence to V. B. Manilal.

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Priya, M., Haridas, A. & Manilal, V.B. Anaerobic protozoa and their growth in biomethanation systems. Biodegradation 19, 179–185 (2008). https://doi.org/10.1007/s10532-007-9124-8

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