Characteristics and composition of fouling caused by pig slurry in a tubular heat exchanger - Recommended cleaning systems - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Journal of Environmental Management Year : 2013

Characteristics and composition of fouling caused by pig slurry in a tubular heat exchanger - Recommended cleaning systems

Abstract

The structure and composition of the fouling deposits caused by pig slurry heated in a tubular heat exchanger were characterized to understand their formation and thus be able to minimize fouling and define effective routine cleaning methods. Two temperatures (55 °C and 80 °C) were investigated. Two types of fouling were identified: organic/mineral and biofilm. The first only formed at temperatures above 50 °C, often during the heating phase, and was the main problem encountered in treatments at 80 °C. Organic/mineral deposits formed a thin compact sub-layer and a thick porous top layer composed of 67-76% minerals, 9-15% proteins, 8-20% carbohydrates and 0-5% fats. Biofilms formed at temperatures between 25 °C and 70 °C in both the cooling and heating sections of the exchanger. This type of fouling predominated at temperatures below 55 °C. The biofilm covered a thin mineral base layer. Strongly acidic or alkaline washing cycle are recommended to clean Type I deposits, while in-line gas-rumbling is recommended for Type II fouling. © 2013 Elsevier Ltd.
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Dates and versions

hal-02598495 , version 1 (15-05-2020)

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Charles Cunault, Y. Coquinot, C.H. Burton, S. Picard, A.M. Pourcher. Characteristics and composition of fouling caused by pig slurry in a tubular heat exchanger - Recommended cleaning systems. Journal of Environmental Management, 2013, 117, pp.17-31. ⟨hal-02598495⟩

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