Corrosion management in power plant cooling systems using tertiary-treated municipal wastewater as makeup water

Choudhury, Mahbuboor Rahman; Hsieh, Ming-Kai; Vidic, Radisav D.; Dzombak, David A.

doi:10.1016/j.corsci.2012.04.042

Cited by 41 publications

(24 citation statements)

References 39 publications

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“…Reclaimed water is often reused as municipal and domestic non-potable water or makeup water for industrial cooling circuits (Safari et al, 2013;Choudhury et al, 2012). Coincidently, the corrosion issue is also the main concern for industrial cooling water systems, which requires the use of corrosion inhibitors as well.…”

Section: A V a I L A B L E O N L I N E A T W W W S C I E N C E D I mentioning

confidence: 99%

Hydroxyl carboxylate based non-phosphorus corrosion inhibition process for reclaimed water pipeline and downstream recirculating cooling water system

Wang

Hou

2016

Journal of Environmental Sciences

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A combined process was developed to inhibit the corrosion both in the pipeline of reclaimed water supplies (PRWS) and in downstream recirculating cooling water systems (RCWS) using the reclaimed water as makeup. Hydroxyl carboxylate-based corrosion inhibitors (e.g., gluconate, citrate, tartrate) and zinc sulfate heptahydrate, which provided Zn 2+ as a synergistic corrosion inhibition additive, were added prior to the PRWS when the phosphate (which could be utilized as a corrosion inhibitor) content in the reclaimed water was below 1.7 mg/L, and no additional corrosion inhibitors were required for the downstream RCWS.Satisfactory corrosion inhibition was achieved even if the RCWS was operated under the condition of high numbers of concentration cycles. The corrosion inhibition requirement was also met by the appropriate combination of PO 4 3− and Zn 2+ when the phosphate content in the reclaimed water was more than 1.7 mg/L. The process integrated not only water reclamation and reuse, and the operation of a highly concentrated RCWS, but also the comprehensive utilization of phosphate in reclaimed water and the application of non-phosphorus corrosion inhibitors. The proposed process reduced the operating cost of the PRWS and the RCWS, and lowered the environmental hazard caused by the excessive discharge of phosphate. Furthermore, larger amounts of water resources could be conserved as a result.

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Section: A V a I L A B L E O N L I N E A T W W W S C I E N C E D I mentioning

confidence: 99%

Hydroxyl carboxylate based non-phosphorus corrosion inhibition process for reclaimed water pipeline and downstream recirculating cooling water system

Wang

Hou

2016

Journal of Environmental Sciences

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“…Note: a weight loss determined from electrochemical polarization resistance measurements (Choudhury, 2012 …”

Section: Bench-scale Recirculation System Experiments With Mww_ph: Comentioning

confidence: 99%

“…In the laboratory experiment with acidified synthetic secondary treated municipal wastewater tolyltriazole (TTA) was used as corrosion inhibitor. Instantaneous corrosion rate profiles for different metal alloys were produced from intermittent R P measurement data (Choudhury et al, 2012) Four different experiments were carried out in the bench-scale recirculation water system with synthetic secondary treated municipal wastewater. The matrix of experiments conducted is shown in Table 3.1.1.…”

Section: Corrosion Experiments Matrix For the Bench-scale Experiments mentioning

confidence: 99%

“…The general water quality of secondary treated municipal wastewater (MWW), nitrified-filtered MWW (MWW_NF) and nitrified-filtered-granular activated carbon adsorbed MWW (MWW_NFG), given in Table 2.3.1 were obtained by averaging the qualities of water samples collected weekly from FTMSA during the summer of 2010 and 2011 (Choudhury, 2012).…”

Section: Characterization Of Secondary and Tertiary Treated Wastewatementioning

confidence: 99%

“…In the pilot-scale testing, corrosion inhibitor TTA was monitored with high performance liquid chromatography (HPLC 1100 Series, Agilent Technologies) (Choudhury et al, 2012).…”

Section: Pilot-scale Corrosion Experiments With Mww_phmentioning

confidence: 99%

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Use of Treated Municipal Wastewater as Power Plant Cooling System Makeup Water: Tertiary Treatment versus Expanded Chemical Regimen for Recirculating Water Quality Management

Dzombak¹,

Vidić²,

Landis³

2012

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| DE-NT0006550Final Technical Report ABSTRACTTreated municipal wastewater is a common, widely available alternative source of cooling water for thermoelectric power plants across the U.S. However, the biodegradable organic matter, ammonia-nitrogen, carbonate and phosphates in the treated wastewater pose challenges with respect to enhanced biofouling, corrosion, and scaling, respectively.The overall objective of this study was to evaluate the benefits and life cycle costs of implementing tertiary treatment of secondary treated municipal wastewater prior to use in recirculating cooling systems. The study comprised bench-and pilot-scale experimental studies with three different tertiary treated municipal wastewaters, and life cycle costing and environmental analyses of various tertiary treatment schemes. Sustainability factors and metrics for reuse of treated wastewater in power plant cooling systems were also evaluated. The three tertiary treated wastewaters studied were: secondary treated municipal wastewater subjected to acid addition for pH control (MWW_pH); secondary treated municipal wastewater subjected to nitrification and sand filtration (MWW_NF); and secondary treated municipal wastewater subjected nitrification, sand filtration, and GAC adsorption (MWW_NFG).Tertiary treatment was determined to be essential to achieve appropriate corrosion, scaling, and biofouling control for use of secondary treated municipal wastewater in power plant cooling systems. The ability to control scaling, in particular, was found to be significantly enhanced with tertiary treated wastewater compared to secondary treated wastewater. MWW_pH treated water (adjustment to pH 7.8) was effective in reducing scale formation, but increased corrosion and the amount of biocide required to achieve appropriate biofouling control. Corrosion could be adequately controlled with tolytriazole addition (4-5 ppm TTA), however, which was the case for all of the tertiary treated waters. For MWW_NF treated water, the removal of ammonia by nitrification helped to reduce the corrosivity and biocide demand. Also, the lower pH and alkalinity resulting from nitrification reduced the scaling to an acceptable level, without the addition of anti-scalant chemicals. Additional GAC adsorption treatment, MWW_NFG, yielded no net benefit. Removal of organic matter resulted in pitting corrosion in copper and cupronickel alloys. Negligible improvement was observed in scaling control and biofouling control. For all of the tertiary treatments, biofouling control was achievable, and most effectively with pre-formed monochloramine (2-3 ppm) in comparison with NaOCl and ClO 2 .Life cycle cost (LCC) analyses were performed for the tertiary treatment systems studied experimentally and for several other treatment options. A public domain conceptual costing tool (LC 3 model) was developed for this purpose. MWW_SF (lime softening and sand filtration) and MWW_NF were the most cost-effective treatment options among the tertiary treatment alternatives considered becaus...

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Influence of pH on corrosion behavior of carbon steel in simulated cooling water containing scale and corrosion inhibitors

Yao

Zhang

et al. 2020

Materials & Corrosion

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In this paper, the influence of pH on the corrosion behavior of AISI 1020 carbon steel in simulated cooling water was investigated by using electrochemical and surface analysis methods. The results of polarization showed that the corrosion resistance of carbon steel increased with an increase in pH of the simulated water, and the corrosion control process changed from cathodic polarization to anode polarization control. The scale and corrosion inhibitor 2‐phosphonobutane‐1,2,4‐tricarboxylic acid (PBTCA) had a certain anodic corrosion inhibition effect on carbon steel, whereas Zn2+ acted as a cathodic inhibitor for carbon steel in simulated water with pH 7–9. In simulated water containing both PBTCA and Zn2+, a good synergistic corrosion inhibition was found between PBTCA and Zn2+, and their corrosion inhibition effect on carbon steel was the best at pH 8. This was attributed to the formation of Zn(OH)2 precipitate film in the cathode region and the formation of Zn–PBTCA complex film in the anode region at this pH.

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Corrosion management in power plant cooling systems using tertiary-treated municipal wastewater as makeup water

Cited by 41 publications

References 39 publications

Hydroxyl carboxylate based non-phosphorus corrosion inhibition process for reclaimed water pipeline and downstream recirculating cooling water system

Hydroxyl carboxylate based non-phosphorus corrosion inhibition process for reclaimed water pipeline and downstream recirculating cooling water system

Use of Treated Municipal Wastewater as Power Plant Cooling System Makeup Water: Tertiary Treatment versus Expanded Chemical Regimen for Recirculating Water Quality Management

Influence of pH on corrosion behavior of carbon steel in simulated cooling water containing scale and corrosion inhibitors

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