| Abstract: | Causes and Nature of the Sedimentation which Sticks to the Milk Tanks after Spray Cleaning The extent of coating formation on the milk tanks was studied with the help of a fully automated apparatus under spray cleaning conditions. It was found that more coating is formed on the surface when the spraying is done with a mixture of steam and cleansing solution than when the cleansing solution is sprayed alone with the pressure of a pump. The coating is formed due to the reaction between the residual orthophosphate of the cleansing solution sticking to the sides and the calcium in the rinsing water. Under the high temperature conditions, the sediments, which are relatively rich in calcium, are formed whose composition gradually approaches that of hydroxyl apatit. Magnesium, sodium, carbonate and silicate contribute only negligibly to the formation of coating. |
