Abstract
To investigate the sources of suspended solids in lined water pipes and polyvinyl chloride pipes, the interior of the water pipes was observed, and the composition of surface-attached materials and corrosion as candidate matter and suspended solids were analyzed. As a result of the observation of the interior of lined water pipes using an underwater camera, brown surface-attached materials were noticed and corrosion was often observed in the seam joints of pipes. As a result of the analysis, the surface-attached materials and corrosion surfaces were found to have a wide variety of elements besides O, Al, Si, Mn and Fe. However, the component in the interior portion of corrosion was chiefly iron oxide. The concentration and composition of three particle sizes (≤25 μm, 25–97 μm, ≥97 μm) shows that the particles smaller than 25 μm had the highest total element concentration. This indicates that the suspended solids were concentrated on this particle size range both in number and in weight. The common feature was seen between the surface-attached material and corrosion surfaces and suspended solids was the high content rate of Al and Fe although they were of different origins.
