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Sewage treatment by controlled eutrophication: bacterial study.

J G Songer, R F Smith, N M Trieff

    Applied Microbiology
    |September 1, 1974
    PubMed
    Summary
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    This study evaluated a marine sewage treatment system using controlled eutrophication. The system significantly reduced fecal coliforms and enterococci, suggesting potential for combined mariculture and wastewater treatment.

    Area of Science:

    • Environmental microbiology
    • Marine biology
    • Wastewater treatment technologies

    Background:

    • Sewage treatment systems require evaluation for microbiological safety and efficiency.
    • Controlled eutrophication in marine environments presents a novel approach to wastewater management.
    • Understanding microbial dynamics is crucial for assessing the efficacy of such systems.

    Purpose of the Study:

    • To assess the microbiological properties of a marine sewage treatment system.
    • To identify and quantify specific bacterial groups at various treatment stages.
    • To evaluate the system's potential for combined mariculture and sewage treatment.

    Main Methods:

    • Isolation and identification of bacterial groups including fecal coliforms, enterococci, Salmonellae, Shigellae, Vibrio parahaemolyticus, and Vibrio alginolyticus.

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  • Microbiological analysis at three distinct stages of the sewage treatment process.
  • Testing of brine shrimp (Artemia salina) for associated microbial loads.

    • Main Results:

    • Significant reductions (P < 0.01) in fecal coliforms and enterococci from raw sewage to effluent were observed.
    • Salmonellae, Shigellae, and Vibrio parahaemolyticus were not detected in any samples.
    • Vibrio alginolyticus was found only in the saline effluent, indicating its halophilic nature.

    Conclusions:

    • The controlled eutrophication marine sewage treatment system demonstrates significant pathogen reduction.
    • The system shows promise for integration into a combined mariculture and wastewater treatment facility.
    • Low microbial association with brine shrimp suggests suitability for mariculture applications within the system.