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Removal of UHT dairy fouling — An efficient cleaning process by optimizing the rate controlling alkaline cleaning step
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience. Lund University, Sweden.
Tetra Pak Processing Systems, Sweden.
Lund University, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.ORCID iD: 0000-0001-7150-9099
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2018 (English)In: Food and Bioproducts Processing, ISSN 0960-3085, E-ISSN 1744-3571Article in journal (Refereed) Epub ahead of print
Abstract [en]

A rigid mineral-based deposit, termed ultra-high temperature (UHT) fouling, is formed on heat exchanger surfaces during milk processing at 140 °C. The removal of this type of fouling is for the first time assessed using a laser triangulation sensor and a camera, to measure changes in the thickness and to visualize structural changes in the fouling in situ. The process was monitored during both the alkali and acid cleaning steps. There was no global swelling of the fouling layer during alkali cleaning under the investigated conditions. However, significant degradation of the protein network was observed, which affected the acid cleaning step and the efficiency of the cleaning process. We conclude that treatment with alkali is required to facilitate the removal of deposits with high mineral content during the acid cleaning step. The results have implications for optimizing the cleaning process so as to minimize energy expenditure, while ensuring efficient heat transfer and maintaining product quality.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Cleaning, Cleaning agent concentration, Dairy fouling, Mineral deposit, Protein degradation, UHT, Dairies, Fouling, Heat exchangers, Heat transfer, Mineral resources, Minerals, Proteins, Alkaline cleaning, Cleaning agents, Cleaning process, Energy expenditure, Laser triangulation sensor, Rate-controlling, Ultrahigh temperature
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36918DOI: 10.1016/j.fbp.2018.11.010Scopus ID: 2-s2.0-85057977224OAI: oai:DiVA.org:ri-36918DiVA, id: diva2:1274169
Note

 Funding details: Svenska Forskningsrådet Formas;

Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2018-12-28Bibliographically approved

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Hamberg, Lars

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