The effect of anaerobic and aerobic wastewater treatment on faecal coliforms and antibiotic-resistant faecal coliforms.

The efficiency of anaerobic treatment of animal wastes and aerobic treatment of urban sewage in removing faecal coliforms and their effect on the antibiotic-resistant coliforms was evaluated in this study. A two reactor anaerobic digester and six activated sludge plants were studied. The concentrations of both faecal coliforms in sampling from influents and treated effluents were calculated to determine efficiency of plants during depuration treatments.

Relationship between environment spread and presence in hosts of Escherichia coli strains resistant to antibiotics and metals.

The antibiotic and metal resistance percentages of 315 E. coli strains, isolated from: a sample population not-exposed to antibiotics, hospitalized inpatients and from bred animals, were compared with the resistance percentages of 217 environmental isolates (sewage and river isolates). The highest levels of resistance and multiresistance were found for clinical and river isolates.