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Method Development for Measuring Cleaning Agent Efficiency at a Laboratory Scale. Cleaning agent efficiency in dissolution of UHT fouling at different concentrations and temperatures.

Fredrik Hulting
Göteborg : Chalmers tekniska högskola, 2015. 44 s.
[Examensarbete på avancerad nivå]

In the milk industry, the production must be stopped daily in order to clean the process equipment from deposits that are formed at the inside surface when the products are heat treated. This leads reduced production time since no products can be treated when the equipment are being cleaned. The heat treatment of milk products is necessary to ensure that the product is safe to consume. When heat treating the milk, certain compounds in the milk become unstable and form a deposit called fouling inside the heating equipment. This fouling layer reduces the heat transfer from the heat equipment to the product that is supposed to be heat treated. In order to remove the fouling deposit cleaning with first alkaline and then acidic detergent are used. It can take up to a few hours before the equipment is cleaned depending on the degree of fouling. The aim of this master’s thesis is to develop a laboratory method for measuring cleaning efficiency of UHT fouling by using cleaning detergents at different temperatures and concentrations. The method was created by looking on how a Cleaning-In-Place process is performed and imitates these steps at a laboratory level, by performing experiments on storage, drying, size and separation of fouling. The cleaning method was evaluated according to repeatability and ability to distinguish cleaning effects of the different cleaning liquids. A cleaning method for dissolution of UHT fouling was achieved where it was possible to detect trends of degree of dissolved fouling when different temperature and concentration of cleaning liquids were used in the sodium hydroxide step. The repeatability of the cleaning method was sufficient to be able to detect the cleaning trends. The cleaning effect trials showed that higher temperature and concentration leads to more fouling dissolved. It was also seen that with higher concentration of alkaline detergent a lower temperature could be used to achieve a similar cleaning compared to lower concentration of alkaline detergent.

Nyckelord: Fouling, cleaning, mineral, milk

Publikationen registrerades 2015-12-22. Den ändrades senast 2015-12-22

CPL ID: 228984

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