• Title/Summary/Keyword: Cathodic

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Effect of substrate concentration on the operating characteristics of microbial electrolysis cells (기질 농도에 따른 미생물전기분해전지의 운전 특성)

  • Hwijin Seo;Jaeil Kim;Seo Jin Ki;Yongtae Ahn
    • Journal of the Korea Organic Resources Recycling Association
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    • v.31 no.4
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    • pp.41-49
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    • 2023
  • This study examined the effect of input substrate concentration on hydrogen production of microbial electrolysis cells. To compare the performance of MEC according to the input substrate concentration, six laboratory-scale MEC reactors were operated by sequentially increasing the input substrate concentration from 2 g/L of sodium acetate, to 4 g/L, and 6 g/L. The current density, hydrogen production, and SCOD removal rate were analyzed, and energy efficiency and cathodic hydrogen recovery were calculated to compare the performance of MEC. The maximum volumetric current density was obtained at 4 g/L condition (76.3 A/m3) and it decreased to 19.0 A/m3, when the input concentration was increased to 6 g/L, which was a 75% decrease compared to the 4 g/L input condition. Maximum hydrogen production was obtained also at 4 g/L condition (47.3 ± 16.8 mL), but maximum hydrogen yield was obtained at 2 g/L input condition (1.1 L H2/g CODin). Energy efficiencies were also highest in 2 g/L condition; the lowest result was observed at 6 g/L condition. Maximum electrical energy efficiency was 76.4%, and the maximum overall energy efficiency was 39.7% at 2 g/L condition. However, when the substrate concentration increased to 6 g/L, the performance was drastically decreased. Cathodic hydrogen recovery also showed a similar tendency with energy efficiency, with the lowest concentration condition showing the best performance. It can be concluded that operating at low input substrate concentration might be better when considering not only hydrogen yield but also energy efficiency.

Rapid Corrosion Test for Concrete Reinforcing Steels (부식 촉진실험에 의한 철근방식 연구)

  • 윤강훈;이상국;정영수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.671-675
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    • 2000
  • The purpose of this research is to evaluate the performance of various kind anticorrosives which is developed to enhance the capacity of anticorrosives in several conditions of salty reaction, and evaluate corroded state according to various amounts of chloridized material. Beside, to exam Zincspray for Cathodic Protection System evaluation.

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