Microbial community dynamics in anaerobic bioreactors and algal tanks treating piggery wastewater

Sayali Patil, Martin Kumar, Andrew Ball

    Research output: Contribution to journalArticlepeer-review

    41 Citations (Scopus)

    Abstract

    Integrated biosystem is becoming a major aspect of wastewater management practice. Microbial communities in piggery wastewater sampled from anaerobic (thermophilic and mesophilic) and aerobic digesters (algal tanks) during waste remediation were analyzed by culture-independent techniques based on polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). The use of Muyzer's 314F-GC, 518R bacterial primers, and archaeal A934F, 1309R primers followed by partial 16s rDNA sequence analysis of the main bands from DGGE revealed the presence of unknown and as yet uncultured microorganisms but also showed functional and ecologically significant denitrifying, acetogenic bacteria along with autotrophic, hydrogenotrophic, and acetoclastic methanogen archaea. Thermophilic digesters were dominated by γ-Proteobacteria, Methanothermobacter sp., while mesophilic digesters showed dominance by Firmicutes, uncultured bacteria, Methanosarcina, and Methanoculleus genera. Under aerobic conditions within algal tanks, pH rose from 7.17 to 9.32, with a significant decrease in total ammonia nitrogen, chemical oxygen demand, and soluble phosphorus levels. PCR-DGGE proved a useful tool for investigating the dynamics of microbial community in the bio-processing of piggery wastewater. Knowledge of the microbial communities involved in digestion of piggery wastewater will allow optimization of integrated biosystem by removing the main pollutants like inorganic ammonium-nitrogen, phosphorus, and pathogens from intensive farming system.

    Original languageEnglish
    Pages (from-to)353-363
    Number of pages11
    JournalApplied Microbiology and Biotechnology
    Volume87
    Issue number1
    DOIs
    Publication statusPublished - Jun 2010

    Keywords

    • 16S rDNA polymerase chain reaction (PCR)
    • Denaturing gradient gel electrophoresis analysis (DGGE)
    • Integrated biosystem
    • Microbial community

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