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03562 MIC ON STAINLESS STEELS IN WASTEWATER TREATMENT- ANAEROBIC AND AEROBIC TREATMENTS INFLUENCE ON ENNOBLEMENT AND THE PASSIVE SURFACE

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Product Number: 51300-03562-SG
ISBN: 03562 2003 CP
Author: A. Iversen
Industry: Water/Wastewater
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Three Stainless steel grades S30400, S31600 and S31803 were field tested in the final stages of wastewater treatment plants using anaerobic and aerobic purification processes. Open circuit potentials (OCP) for stainless steels were measured both in aerobic and anaerobic treated wastewater. No ennoblement occurred in the anaerobic purification, but a decrease in the OCP to as low values as -500 mV/SCE. However, in the aerobic purification ennoblement occurred to as high values as +350 mV/SCE after 13 days exposure, but the potential decreased after 50 days to low values, -500 mV/SCE, similar to values obtained in anaerobic purification processes. The decrease in OCP was attributed to the sludge growth surrounding the exposed coupons. Treated wastewater was collected from an aerobic purification stage with high oxygen demand also causing a decrease in the OCP. Investigations were undertaken to reproduce ennoblement under these circumstances. Ennoblement was obtained in the laboratory only after oxygen and a catalytic acid were supplied to the water. Polarization measurements were also undertaken for exposed stainless steel surfaces in anaerobic treatment and compared with surfaces in aerobic treatment. Furthermore, a case was discussed where extensive corrosion occurred on S31600 in anaerobic sludge under oxidative conditions.
Three Stainless steel grades S30400, S31600 and S31803 were field tested in the final stages of wastewater treatment plants using anaerobic and aerobic purification processes. Open circuit potentials (OCP) for stainless steels were measured both in aerobic and anaerobic treated wastewater. No ennoblement occurred in the anaerobic purification, but a decrease in the OCP to as low values as -500 mV/SCE. However, in the aerobic purification ennoblement occurred to as high values as +350 mV/SCE after 13 days exposure, but the potential decreased after 50 days to low values, -500 mV/SCE, similar to values obtained in anaerobic purification processes. The decrease in OCP was attributed to the sludge growth surrounding the exposed coupons. Treated wastewater was collected from an aerobic purification stage with high oxygen demand also causing a decrease in the OCP. Investigations were undertaken to reproduce ennoblement under these circumstances. Ennoblement was obtained in the laboratory only after oxygen and a catalytic acid were supplied to the water. Polarization measurements were also undertaken for exposed stainless steel surfaces in anaerobic treatment and compared with surfaces in aerobic treatment. Furthermore, a case was discussed where extensive corrosion occurred on S31600 in anaerobic sludge under oxidative conditions.
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02451 MIC ON STAINLESS STEELS IN WASTEWATER TREATMENT PLANTS FIELD TESTS AND A RISK ASSESSMENT

Product Number: 51300-02451-SG
ISBN: 02451 2002 CP
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04600 Microbiologically Influenced Corrosion Failure of AISI Type 304 Stainless Steel in a Wastewater Treatment System

Product Number: 51300-04600-SG
ISBN: 04600 2004 CP
Author: Kurissery R. Sreekumari, Kyozo Hirotani, and Yasushi Kikuchi, Osaka University; Katsuya Akamatsu, Ka
Publication Date: 2004
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The rapid and unexpected failure of AISI type 304 stainless steel in a wastewater treatment system was investigated in the laboratory by simulation studies for a period of 4 months. Slime and water samples from the failure site were screened for corrosion causing bacteria.
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99171 MIC ON STAINLESS STEELS IN WASTEWATER TREATMENT PLANTS

Product Number: 51300-99171-SG
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