Microbial corrosion of steel coupons in a freshwater habitat in the Niger Delta

Abstract

Microbial corrosion of stainless, mild and carbon steel coupons in a semi static freshwater habitat was carried out monthly for a period of one year. Corrosion rate was determined by weight loss. Carbon steel had corrosion rate of 44 g/year, mild steel 27 g/year, stainless steel 0.64 g/year. Ecological quality parameters of the river water for rainy season decreased from April to October, respectively in the following trend; total dissolved solids (23 to 2.31) mg/l, total suspended solids (40 to 12) mg/l, total organic carbon (78.24 to 4.33) mg/l, conductivity (43 to 4.73) µs/cm, salinity (31 to 3.10) mg/l, oil and grease (34.23 to 1.67) mg/l, Chloride (52.11 to 1.05) mg/l, Sulphate (33.14 to 1.15) mg/l, Sulphite (8.11 to 10.14) mg/l, pH(6.4 to 6.0), temperature (27 to 25°C), biochemical oxygen demand (64.13 to 1.34) mg/l. That of dry season (November to March) respectively showed this trend. Total dissolved solids (3.14 to 52.11) mg/l, total suspended solids (9 to 40) mg/l, total organic carbon (5.10 to 10.24) mg/l, conductivity (6.29 to 104) µs/cm, salinity (5.11 to 87.33) mg/l, oil and grease (2.14 to 1.82) mg/l, Chloride (1.02 to 2.11) mg/l, Sulphate (0.17 to 4.95) mg/l, Sulphite (11.10 to 16.23) mg/l, pH (6.1 to 6.0), Temperature (25 to 26°C), biochemical oxygen demand (1.53 to 7.31) mg/l. Weight loss of stainless, mild and carbon steel for rainy season (April to October) respectively, and showed the following trend (0 to 0.030), (0.695 to 1.568), and (1.000 to 2.316) g, while the dry season (November to March) respectively showed the following trend (0.044 to 0.111), (1.586 to 5.771) and (2.325 to 9.131) g. Corrosion rate of stainless, mild and carbon steel for rainy season (April to October) respectively showed the following trend (0 to 0.004), (0.695 to 0.244) and (1.000 to 0.331) g/month while the dry season (November to March) showed the following trend respectively (0.006 to 0.009), (0.198 to 0.481), and (0.291 to 0.761) g/month. The use of stainless steel, if not already in use should be encouraged as a material for pipelines, flowlines and bulklines in the Nigerian Petroleum industry. Integrity checks on these surface facilities should be increased in the dry season.

Corrosion of Carbon Steel in Mauritian water bodies

“…A hypothesis set to find out whether the corrosion rate values of the coupons from the three sites correspond to the known values of 0.17-1.06 mm/year for seawater, and 1.00 mm/year for freshwater [31][32][33], proved that all lie within the accepted range at a P-value of less than 0.05 for a confidence interval of 95%. Furthermore, a two-tail two sample t-test at 95% confidence interval was used to compare the corrosion rate values of the three sites.…”

The Influence of Leachate Water on Corrosion Rate of Mild Steel Plate

“…They reported microbial corrosion is one of the dominant corrosion mechanisms involving the leachate water. Biological corrosion has cost billions of dollars lost annualy worldwide [9]. Many works reported biological corrosion on steel, e.g.…”

“…[7][8]. Furthermore, microbiological organism can cause corrosion also on aluminium [9] and copper [11]. Steel, aluminium and copper are widely applied as materials of pipe buried underground which may in contact with leachate water.…”

Fenton oxidation and combined Fenton-microbial treatment for remediation of crude oil contaminated soil in Assam – India

“…7 Efforts have been made towards reclamation of the crude oil-inundated soil through natural attenuation as well as bioremediation and other methods. 8,9 Crude oil is a repository of hydrocarbons and other organic compounds and soil contaminated with crude oil can be effectively managed through the use of chemical oxidants for converting the higher hydrocarbons to innocuous simple compounds or through complete mineralization. Common oxidants, used for the purpose, include: hydrogen peroxide, potassium or sodium persulfate, potassium or sodium dichromate, potassium permanganate, etc.…”