General and Kinetic Aspects of Pre‐rinse and Cleaning of a Milk Storage Tank

Abstract

With the aim of studying pre‐rinsing and cleaning of a milk storage tank, different representative samples are collected during the process and their components (protein, sugar and lipid) analysed. The main conclusions of this study may be summarized as follows: (1) The mean thickness of milk remaining in the tank ranges around 20 μm. It depends on the dropping time and on the possible presence of milk foam. (2) The different main milk components do not exhibit the same removal rate and sugar seems to be completely removable by rinsing only. (3) Prerinsing may be characterized by four periods of which one depends on a diffusion mechanism. (4) Pre‐rinse is a very rapid process which mainly depends on the pre‐rinse solution volume used per unit of soiled surface. (5) Hard water, osmosed water alone or admixed with a surface active agent or caustic soda (1%) lead to the same results.

Waste Minimization in Batch Vessel Cleaning

“…For example, Tissier et al (1988) used liquid holdup equations presented by Van Rossum (1958) as a check on the amount of residue left on a plate by falling films of model solutions and dairy products, and then measured rinsing kinetics as the residue was removed by a falling film of water. Tissier et al (1981) have also studied the rinsing kinetics of milk storage tanks. The fouling of heat exchange surfaces by milk was studied by Lalande and Corrieu (1981), Tissier et ai.…”