Mitigation of biofouling using electromagnetic fields in tubular heat exchangers-condensers cooled by seawater.

Abstract

Electromagnetic field (EMF) treatment is presented as an alternative physical treatment for the mitigation of biofouling adhered to the tubes of a heat exchanger-condenser cooled by seawater. During an experimental phase, a fouling biofilm was allowed to grow until experimental variables indicated that its growth had stabilised. Subsequently, EMF treatment was applied to seawater to eliminate the biofilm and to maintain the achieved cleanliness. The results showed that EMFs precipitated ions dissolved in the seawater. As a consequence of the application of EMFs, erosion altered the intermolecular bonding of extracellular polymers, causing the destruction of the biofilm matrix and its detachment from the inner surface of the heat exchanger-condenser tubes. This detachment led to the partial removal of a mature biofilm and a partial recovery of the efficiency lost in the heat transfer process by using a physical treatment that is harmless to the marine environment.

AI evidence extraction

Main findings

After a mature fouling biofilm was allowed to stabilize, EMF treatment applied to seawater was reported to precipitate dissolved ions and to alter intermolecular bonding of extracellular polymers, contributing to destruction of the biofilm matrix and detachment from tube surfaces. The detachment was associated with partial removal of mature biofilm and partial recovery of heat transfer efficiency.

Outcomes measured

• Biofilm/biofouling detachment/removal from heat exchanger-condenser tubes
• Ion precipitation in seawater
• Heat transfer efficiency recovery

Limitations

• No EMF parameters (e.g., frequency, field strength) reported in the abstract
• No sample size or quantitative effect estimates reported in the abstract
• Mechanistic claims (e.g., erosion altering bonding) are described without supporting detail in the abstract
• Extent of removal and efficiency recovery described as partial without quantified magnitude

{
    "study_type": "engineering",
    "exposure": {
        "band": null,
        "source": "industrial/engineering EMF treatment of seawater in heat exchanger-condenser",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Biofilm/biofouling detachment/removal from heat exchanger-condenser tubes",
        "Ion precipitation in seawater",
        "Heat transfer efficiency recovery"
    ],
    "main_findings": "After a mature fouling biofilm was allowed to stabilize, EMF treatment applied to seawater was reported to precipitate dissolved ions and to alter intermolecular bonding of extracellular polymers, contributing to destruction of the biofilm matrix and detachment from tube surfaces. The detachment was associated with partial removal of mature biofilm and partial recovery of heat transfer efficiency.",
    "effect_direction": "benefit",
    "limitations": [
        "No EMF parameters (e.g., frequency, field strength) reported in the abstract",
        "No sample size or quantitative effect estimates reported in the abstract",
        "Mechanistic claims (e.g., erosion altering bonding) are described without supporting detail in the abstract",
        "Extent of removal and efficiency recovery described as partial without quantified magnitude"
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.66000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "electromagnetic field",
        "EMF treatment",
        "biofouling",
        "biofilm",
        "heat exchanger",
        "condenser",
        "seawater",
        "ion precipitation",
        "extracellular polymers",
        "heat transfer efficiency"
    ],
    "suggested_hubs": []
}

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