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Hazards from pathogenic microorganisms in land-disposed sewage sludge
T M Straub1, I L Pepper, C P Gerba
1Department of Soil and Water Science, University of Arizona, Tucson 85721.
Reviews of Environmental Contamination and Toxicology
|January 1, 1993
Summary
Sewage sludge contains pathogens that can contaminate groundwater and pose public health risks. New DNA technologies offer improved detection and risk assessment for these environmental pathogens.
Area of Science:
- Environmental microbiology
- Public health
- Molecular biology
Background:
- Sewage sludge contains diverse pathogens (viral, bacterial, protozoan, fungal, helminth).
- Sludge treatment often fails to eliminate pathogens, posing a public health risk.
- Pathogens in land-applied sludge can contaminate groundwater and spread significant distances.
Purpose of the Study:
- To highlight the public health risks associated with pathogens in sewage sludge.
- To identify the limitations of current methods for detecting sludge-borne pathogens.
- To propose advanced molecular techniques for improved pathogen detection and risk assessment.
Main Methods:
- Review of existing literature on sewage sludge composition and pathogen survival.
- Analysis of current pathogen detection methods and their limitations.
- Introduction of recombinant DNA technologies, including gene probes and polymerase chain reaction (PCR).
Main Results:
- Pathogens in sewage sludge can survive for extended periods in the environment.
- Inadequate sensitivity of current detection methods hinders accurate risk assessment.
- Recombinant DNA technology offers enhanced sensitivity for pathogen identification.
Conclusions:
- Land-applied sewage sludge poses a significant risk of groundwater contamination with infectious pathogens.
- Improved detection methods are crucial for accurate public health risk assessment.
- Recombinant DNA technology shows promise for more sensitive pathogen detection and robust risk assessment models.