Abstract
Cleaning-in-place NaOH solutions from a milk standardisation dairy plant are reused for several days before being discharged to the purification station. During reuse the surface tension of the industrial cleaning solutions was reduced from ~70 mJ.m -2 for newly prepared NaOH down to ~30 mJ.m -2 during the week. The decrease was rapid during the first few reuse cycles and stabilised thereafter, while the polluting load and suspended solids increased inversely. The cleaning efficiency test consisted of an ultrafiltration membrane fouled with whey proteins, which was cleaned using these cleaning solutions, either without any treatment, or following crossflow micro- and nanofiltration. It was found that microfiltrates and nanofiltrates with both low surface tension and suspended solids resulted in higher efficiency and cleanliness, and a much faster cleaning rate. The ef- fects of suspended solids and low surface tension will have to be further studied to determine the role of each parameter and confirmed on stainless steel surfaces and in a milk processing plant. Cleaning / NaOH / surface tension / dairy industry
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