Abstract
This article focuses on the study of the membrane concentration process using buttermilk ultrafiltration nanofiltration membranes. Two types of Vladipor OPMN nanofiltration membranes are being investigated in order to identify the main filtration dependencies. For each type, a pressure in the range of 0.5 to 2.0 MPa and a temperature of 20 to 40 ° C are applied. The results indicate that both types of membranes effectively retain lactose at a pressure of 2.0 MPa, a temperature of 40 ° C and a concentration factor. about 2. Varying the flow velocity above the membrane from 0.5 m / s to 1.5 m / s allows obtaining an increase in specific productivity by 15% from the initial one. The influence of the effects of concentration polarization on the specific productivity of nanofiltration membranes is established. The limitation of the concentration factor due to the increase in the osmotic pressure of the solution is determined. The conclusion is made about the possibility of large-scale introduction of nanofiltration of secondary material resources of milk processing in the study of membrane regeneration processes. Key words: buttermilk, ultrafiltration, nanofiltration, lactose, membrane concentration.
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