Journal of Industrial and Engineering Chemistry, Vol.21, 1340-1349, January, 2015
Production of high-quality water by reverse osmosis of milk dairy condensates
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Low-pollution flash cooler (FC) condensates from the direct heat treatment of milk and milk-based products were treated by means of reverse osmosis (RO) in order to obtain high-quality water for use in boilers. The behaviour of the spiral-wound membranes at the pilot-plant scale (8.2m2 surface area) was tested in terms of the permeate flow rate (J) and quality (conductivity and chemical oxygen demand (COD)) as a function of the operation conditions, including the pressure, temperature and volume concentration rate (VCR). Response surfaces were drawnwith the aim of obtaining information regarding the permeate flow rate as well as conductivity and COD reduction in the range of the studied parameters. Based on the experimental data, a plant with a 90% recovery rate (RR)was proposed with the objective of carrying out a preliminary economic assessment, which yielded a payback of 1.16 years.
Keywords:Water reuse;Boiler water;Flash cooler condensates;Dairy industry;Reverse osmosis;Cost estimation
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