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Chemical and microbiological studies on leachates from a waste tip.

1 
Some chemical and microbial parameters were examined in a 12 month study of leachate from a waste tip. 
 
2 
Anaerobic decomposition within the tip yielded large amounts of aliphatic acids in raw leachate, which exerted a bacteriostatic action on coliforms within the tip. 
 
3 
Heterotrophic aerobes subcultured from the four sampling areas included representative from 11 bacterial genera and one mould. 
 
4 
Many of the isolated bacteria grew slowly and produced colonies much smaller than normal. The pollutants in raw leachate probably suppressed the growth of these organisms.