Importance of disinfectant demand of materials for maintaining residuals in drinking water distribution systems

摘要

This study demonstrates the impact of pipe material and deposits on disinfectant consumption in distribution systems. The materials tested (grey and ductile iron, bitumen, cement and epoxy lined ductile iron, PVC and polyethylene) could be ranked in order of their oxidant demand; corroded pipe surfaces being highly reactive with both chlorine and monochloramine. Biofinlm also had a measurable effect on oxidant consumption, but was only significant with low oxidant demand materials (polyethylene, cement).