EFFECT OF DISSOLVED OXYGEN ON CORROSION OF SPONGE IRON IN BIOLOGICAL SPONGE IRON SYSTEM

ZHANG Qi; WANG Ya'e; LI Jie; XIE Huina; LI Yuanyi

doi:10.13205/j.hjgc.202302009

Volume 41 Issue 2

Feb. 2023

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ZHANG Qi, WANG Ya'e, LI Jie, XIE Huina, LI Yuanyi. EFFECT OF DISSOLVED OXYGEN ON CORROSION OF SPONGE IRON IN BIOLOGICAL SPONGE IRON SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 60-65. doi: 10.13205/j.hjgc.202302009

Citation:

ZHANG Qi, WANG Ya'e, LI Jie, XIE Huina, LI Yuanyi. EFFECT OF DISSOLVED OXYGEN ON CORROSION OF SPONGE IRON IN BIOLOGICAL SPONGE IRON SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 60-65. doi: 10.13205/j.hjgc.202302009

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EFFECT OF DISSOLVED OXYGEN ON CORROSION OF SPONGE IRON IN BIOLOGICAL SPONGE IRON SYSTEM

doi: 10.13205/j.hjgc.202302009

School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Received Date: 2021-11-18
Available Online: 2023-05-25
Publish Date: 2023-02-01

Abstract

Abstract

In order to investigate the effect of dissolved oxygen on the dissolution of sponge iron in the biological sponge iron system, sponge iron was involved in the activated sludge to form the biological sponge iron system. By simulating the corrosion state of sponge iron in the actual reactor and measuring the TFe content in the biological sponge iron system, the effect of dissolved oxygen on the dissolution of sponge iron was studied. By making sponge iron into a working electrode and intervening into the activated sludge, the effect of dissolved oxygen on the corrosion rate and polarization resistance of sponge iron in the biological sponge iron system was studied by AUTOLAB electrochemical workstation. The results showed that in the biological sponge iron system, TFe dissolution of sponge iron was positively correlated with the DO concentration of the reaction system, and the effect became more and more obvious with the prolonging of running time. With the increase of dissolved oxygen in activated sludge mixed solution, the corrosion potential moved negatively, the corrosion current moved positively, the corrosion tendency increased, and the corrosion effect became stronger. Through the polarization curve and parameters analysis, the polarization resistance of sponge iron under different dissolved oxygen followed the order of (6.5±0.5) mg/L<(3.5±0.2) mg/L<(0.5±0.2) mg/L. Under anoxic condition, the corrosion resistance was stronger, and dissolved oxygen could reduce the polarization resistance and promote the corrosion of sponge iron filler.
- microbial corrosion,
- polarization curve,
- dissolved oxygen,
- dissolution of iron,
- corrosion rate

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References(25)

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