Microbiological Characteristics

Microbiological Characteristics

Microbiological Characteristics
The composition of microorganisms varies according to the source of waste water. Sewage water normally comprises of fungi, protozoa, algae, bacteria and viruses.

Raw sewage contains millions of bacterial ml including coliforms, streptococci, anaerobic spore forming bacteria, Proteus, etc.

Soil-borne bacteria include Bacillus subtilis, B. megaterium, B. mycoides, Pseudomonas fluorescence, Achromobacter sp. and Micrococcus sp.

Bacteria of intestinal origin which are harmless include E. coli, Proteus and Serratia and the bacteria of pathogenic ones include enterococci, Clostridium perfringens, Vibrio cholerae, Salmonella typhi, Salmonella paratyphi, Shigella dysenteriae.

Viruses causing poliomyelitis, infectious hepatitis and Coxsackie, and excreted in the faeces of infected host are seen in the sewage.

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