INFLUENCE OF THE POLYPROPYLENE [PPR] PIPES CHARACTERISTICS ON THE DRINKING WATER QUALITY

摘要

Polypropylene random [PPR] has been tested as pipe material in contact with drinking water. The influence of the pipe's dimensions, surface and volume in contact with water, of the temperature and of the stagnation period of water in pipes on the germs and bacteria growth has been studied, using un-chlorinated drinking water and drinking water, from the same source, chlorinated into the laboratory, at a minimum level and at the maximum level allowed by the law. After 9 hours of contact with PPR, water has been submitted to a microbiological and physical-chemical analysis. The total number of germs [NTG] developed at 22℃ and respectively 37℃, Coliform bacteria [CB] and E. coli numbers of colonies, as well as water turbidity [T], have been determined.