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Enteric bacteria in aerobically digested sludge.

S R Farrah, G Bitton

    Applied and Environmental Microbiology
    |April 1, 1984
    PubMed
    Summary
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    Aerobic sludge digestion effectively reduced levels of indicator bacteria and Salmonella spp. by 1-2 log10 per gram. While treatment lowered microbial loads, it did not completely eliminate these bacteria from the sludge.

    Area of Science:

    • Environmental microbiology
    • Wastewater treatment technologies
    • Public health microbiology

    Background:

    • Sludge management is crucial in wastewater treatment.
    • Pathogenic bacteria and indicator organisms in sludge pose environmental and health risks.
    • Aerobic digestion is a common sludge treatment method.

    Purpose of the Study:

    • To quantify the reduction of indicator bacteria and Salmonella spp. in sludge after aerobic digestion.
    • To assess the efficacy of single-stage and two-stage aerobic digestion.
    • To evaluate the overall impact of aerobic treatment on microbial load in sludge.

    Main Methods:

    • Samples of undigested and aerobically digested sludge (single and two-stage) were collected.
    • Levels of indicator bacteria, Salmonella spp., and total aerobic bacteria were determined.

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  • Microbial quantification was performed using standard microbiological techniques.

    • Main Results:

    • Aerobic sludge digestion resulted in a 1 to 2 log10 per gram reduction in indicator bacteria.
    • Salmonella spp. levels were significantly reduced following aerobic treatment.
    • Total aerobic bacteria counts were also affected by the digestion process.

    Conclusions:

    • Aerobic digestion is effective in reducing, but not eliminating, indicator bacteria and Salmonella spp. in sludge.
    • Further treatment or monitoring may be necessary to ensure complete pathogen removal.
    • Aerobic treatment contributes to safer sludge management and reduced environmental contamination.