Biofouling on Coated Carbon Steel in Cooling Water Cycles Using Brackish Seawater

Rajala, Pauliina; Sohlberg, Elina; Priha, Outi; Tsitko, Irina; Väisänen, Henri; Tausa, Mikko; Carpén, Leena

doi:10.3390/jmse4040074

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…The cooling water cycles are susceptible to biofouling and scaling, which may reduce heat transfer capacity and enhance corrosion. [4] We design pilot plant to study bio fouling effect, and defining the strategies for the control of the bio fouling. In the power plant for controlling the bio fouling they have chemicals which are intermittently mixed with cooling tower water but they select the proportion of these chemicals on their past experience.…”

Section: Fig 1 Experimental Set Upmentioning

confidence: 99%

Evaluation of Bio-Fouling Effect in Cooling Tower by Chemical Treatment

Hajare¹,

Husainy²,

Jadhav³

et al. 2019

IJRTE

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The main aim of this work is to check the bio fouling in cooling tower and its effect on power generation. The way to reduce bio fouling is necessary issue within the thermal power station, as it results in reduction of the heat transfer rate and ultimately reduction in the power generation rate of plant. So as to attenuate the energy consumption in process plant equipped with device network. In various branches of chemical industries fouling builds up on heat transfer surfaces is a heat transfer equipment burning extra fuel to compensate for a reduced heat recovery accepting reduction of plant output due to periodic equipment cleaning and recovering the cost of cleaning interventions. Microbiological fouling can cause energy losses and loss of tower efficiency. The pilot plant is very useful in the thermal power plant to test the cooling water and then it is used in the thermal power plant to reduce the losses due to the bio fouling. In large power plant they having pilot plant with PLC system and microprocessor with highly accurate sensors. It will give very accurate and direct digital readings on screen

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Section: Fig 1 Experimental Set Upmentioning

confidence: 99%

Evaluation of Bio-Fouling Effect in Cooling Tower by Chemical Treatment

Hajare¹,

Husainy²,

Jadhav³

et al. 2019

IJRTE

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“…The corrosion process, which plays a detrimental role in the overall longevity of subsea structures, has been well studied under low hydrostatic pressure in surface and shallow marine waters [1][2][3]. However, the deep-sea environment is very different from the shallow marine areas and is characterised by low temperature, limited and sporadic inputs of organic nutrients and high hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

Sulfate-dependant microbially induced corrosion of mild steel in the deep-sea: a 10-year microbiome study

Rajala

Cheng

Rice

et al. 2021

Preprint

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Background Metal corrosion in seawater has been extensively studied in surface and shallow waters. However, infrastructure is increasingly being installed in deep-sea environments, where extremes of temperature, salinity and high hydrostatic pressure increase the costs and logistical challenges associated with monitoring corrosion. Moreover, there is currently only a rudimentary understanding of the role of microbially induced corrosion, which has rarely been studied in the deep-sea. We report here an integrative study of the biofilms growing on the surface of corroding mooring chain links that had been deployed for 10 years at ~2 km depth and developed a model of microbially induced corrosion based on flux-balance analysis. Methods We used optical emission spectrometry to analyse the chemical composition of the mooring chain and energy-dispersive X-ray spectrometry coupled with scanning electron microscopy to identify corrosion products and ultrastructural features. The taxonomic structure of the microbiome was determined using shotgun metagenomics and was confirmed by 16S amplicon analysis and quantitative PCR of the dsrB gene. The functional capacity was further analysed by generating binned, genomic assemblies and performing flux-balance analysis on the metabolism of the dominant taxa. Results The surface of the chain links showed intensive and localised corrosion with structural features typical of microbially induced corrosion. The microbiome on the links differed considerably from that of the surrounding sediment, suggesting selection for specific metal-corroding biofilms dominated by sulfur-cycling bacteria. The core metabolism of the microbiome was reconstructed to generate a mechanistic model that combines biotic and abiotic corrosion. Based on this metabolic model, we propose that sulfate reduction and sulfur disproportionation might play key roles in deep-sea corrosion. Conclusions The corrosion rate observed was higher than what could be expected from abiotic corrosion mechanisms under these environmental conditions. High corrosion rate and the form of corrosion (deep pitting) suggest that the corrosion of the chain links was driven by both abiotic and biotic processes. We posit that the corrosion is driven by deep-sea sulfur-cycling microorganisms which may gain energy by accelerating the reaction between metallic iron and elemental sulfur. The results of this field study provide important new insights on the ecophysiology of the corrosion process in the deep sea.

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