| Title |
Evaluation of Corrosion Prevention and Cleaning Effects on Old Water Service Pipes by Inhibitors, Magnetic and Ionic Treatment Apparatuses |
| Authors |
이현동 ( Hyun Dong Lee ) ; 박정훈 ( Jeong Hoon Park ) ; 배철호 ( Chul Ho Bae ) |
| Abstract |
Phosphate-Based Inhibitor, Silicate-Based Inhibitor, and Magnetic and Ionic Treatment Apparatus were used to evaluate their effects on cleaning and anti-corrosion for old water service pipe (Galvanized Steel Pipe, GSP) in Simulated Continuous Flow System (SCFS) during 25weeks. In aspects of water quality, the average concentration of Fe and Zn in their effluents tended to be increased, The average concentration of Fe in their effluents was increased from 0.137 mg/L to 0.482 mg/L compared with the initial average concentration of Fe (0.052 mg/L), and the average concentration of Zn in their effluents was also increased from 0.208 mg/L to 1.282 mg/L compared with the initial average concentration of Zn (0.048 mg/L). And the hydraulic cross sectional capacities of 28 test pieces (old GSPs) also were more increased than those of the initial. The hydraulic cross sectional capacities of old GSPs were more increased from 4.38% to 9.36% by Phosphate-Based Inhibitor, from 3.91% to 11.29% by Silicate-Based Inhibitor, from 1.38% to 16.75% by Magnetic Treatment Apparatus, and from 4.70% to 10.06% by Ionic Treatment Apparatus, respectively, Therefore the results showed that it would take Phosphate- and Silicate-Based Inhibitors form 487 days to 504 days to reach the hydraulic cross sectional capacity of 100% for old GSP of hydraulic cross sectional capacity, 80%. In case of Magnetic Treatment Apparatus and Ionic Treatment Apparatus, it would be required 663 days and 448 days, respectively. And the results of scale composition analysis showed that the contents of phosphate and silicate was increased by using Phosphate- and Silicate-Based inhibitors, the reason was likely that insoluble non-active film was formed by them. |