Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Residual Chlorine Concentration on Water Pipe Corrosion and Corrosion Control Plan

수도관 부식에 대한 잔류염소 농도 영향 및 부식제어 방안

  • Received : 2017.12.22
  • Accepted : 2018.02.01
  • Published : 2018.02.28
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Abstract

Langelier Index (LI) is used as a tap water corrosiveness index. Residual chlorine in tap water induces corrosion inside water pipes. This study takes a deeper look into the effect of residual chlorine in water pipes. Comparison between tap waters of Y and K water treatment plant (WTP) shows that the LI index of K WTP is lower than that of Y. However, the corrosion rate of Y WTP is higher than that of K WTP. This means that the higher the concentration of residual chlorine in tap water, the higher the corrosion rate of pipe materials. When calcium hydroxide was added to tap water, the corrosiveness index was improved and thus the corrosion rate reduced. It is possible to increase the disinfection efficiency by increasing the duration of residual chlorine and suppressing the rust generation of water pipes and to supply minerals. A guideline for corrosion control with residual chlorine should be set up. The effects of residual chlorine should be included in the corrosiveness index of tap water.

Keywords

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Fig. 1 Result of weight loss for different local water WTP inclean water reservoir (Ca conc. : K WTP 5 ~ 6 mg/L, Y WTP33 ~ 38 mg/L).

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Fig. 2 Result of pH for different local WTP.

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Fig. 3 Corrosion Rate Measurement Results with Residual Chlorine Concentration for Carbon Steel specimens using Tafel test.

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Fig. 4 Lab Experiment of Specimen weight loss.

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Fig. 5 Result of weight loss for different Ca concentration in sand filtered water (initial residual chlorine concentration 0 mg/L).

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Fig. 6 Result of weight loss for different Ca concentration in sand filtered water (initial residual chlorine concentration 0.35mg/L).

Table 1 Analysis of tap water quality by region of water Treatment plant

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Table 2 Weight loss experiment of specimen procedure on the WTP

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Table 3 Result of weight loss for different Chlorine in tap water using Tafel test

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Table 4 Analysis of sand filtered water quality in Seoul WTP

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Table 5 Analysis of filtered water quality after 6 weeks of experiment

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