LIUSha-sha,ZHANGHui,CHANGShan,et al.Corrosion Characteristics of Nitrate-reducing Bacteria on Cast Iron Pipe for Water Supply[J].China Water & Wastewater,2023,39(7):43-49.
Corrosion Characteristics of Nitrate-reducing Bacteria on Cast Iron Pipe for Water Supply
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
43-49
Column:
Date of publication:
2023-04-01
- Keywords:
- cast iron pipe for water supply; microbiologically influenced corrosion; nitrate-reducing bacteria; iron release
- Abstract:
- In China, water supply pipes are still mainly cast iron pipes, which will cause corrosion problem in the long-term service process and drinking water secondary pollution. Therefore, the corrosion effects of Pseudomonas monteilii CS01 on cast iron pipes for water supply under different initial nitrate concentrations was investigated in small laboratory reactors, and the characteristics of corrosion products and corrosion rate were explored by physical and chemical analysis combined with weight loss method. The presence of CS01 and the increase of initial NO3--N was conducive to the formation of Fe3O4 in the corrosion products, thus inhibiting the corrosion and iron release. When the initial NO3--N was 20 mg/L, the total iron concentration and corrosion rate were the lowest, which were (2.30±1.25) mg/L and (0.036±0.003) mm/a (at 170 days), respectively, and the consumption of NO3--N and the production of NO2--N and NH4+-N reached the highest values. The main corrosion products were α-FeOOH (needle-like and lamellar), CaCO3 (granular) and Fe3O4 (spherical).
Last Update:
2023-04-01