Enumeration of pathogenic bacteria from sewage sludge in Kuwait

Area of Science:

• Environmental microbiology
• Public health microbiology

Background:

• Domestic sewage in Kuwait primarily undergoes treatment via an activated sludge process.
• Understanding the microbial composition of sewage sludge is crucial for assessing public health risks.

Purpose of the Study:

• To investigate the presence and types of pathogenic bacteria in sewage sludge at various treatment stages in Kuwait.
• To determine the antibiotic sensitivity profiles of isolated pathogenic bacteria.

Main Methods:

• Isolation and enumeration of bacteria from raw sewage and different stages of activated sludge.
• Identification of bacterial species using standard microbiological techniques.
• Antibiotic sensitivity testing of the isolated bacteria.

Main Results:

• Several pathogenic bacteria, including two Gram-positive cocci and eight Gram-negative bacilli, were identified.
• Dominant bacterial species varied monthly: Aeromonas hydrophila in March, Serratia liquefaciens and Salmonella species in April, and Enterobacter aerogenes in May.
• A wide range of antibiotics were tested against the isolated bacterial strains.

Conclusions:

• Activated sludge treatment in Kuwait harbors various pathogenic bacteria.
• The prevalence of specific pathogens fluctuates seasonally.
• Antibiotic sensitivity data are essential for guiding treatment strategies and understanding antimicrobial resistance in this context.