Abstract: A composition for cleaning of dairy equipment comprising detergent, a mixture of sodium carbonate and sodium bicarbonate in a ratio of 1:5 to 3:1, and as from 1 to 100% w/w of the carbonates, an alkaline proteinase based upon a proteolytic activity of 1.5 Anson units per gram. Less proteinase may be employed but cleaning efficiency decreases substantially when the enzyme content is less than about 1%.A dairy cleaning solution containing the composition as 0.1-0.5% w/v in water exhibits pH 8.5-11. In hard water areas sodium tripoly phosphate may be included in the composition, being up to 0.125% w/v in the dairy cleaning solution. The carbonate content of the cleaning solution is from 0.05-0.25% w/v.The method involves passing a solution at about pH 8.5-11 of the composition through the dairy equipment at a solution temperature of ambient to 55.degree. C.

Abstract: There is described herein a method and apparatus for determining the total consumption of dissolved oxygen in a liquid by organic materials contained therein in the presence of a biological growth culture. The invention includes providing a supply of liquid, preferably water, which is saturated with air. A liquid sample containing the organic material is supplied to the air saturated liquid. The combined mixture is then supplied, at a fixed volumetric rate, to a tube of predetermined length which contains the biological "culture". The biological growth, utilizing the oxygen dissolved in the liquid mixture, reacts with the organic material contained therein resulting in certain synthesized materials and other oxidation products. At the exit end of the tube oxygen detecting means is positioned which measures the oxygen contained in the liquid mixture after exposure to the biological growth.