ORIGINAL RESEARCH
Separation of Lactic Acid Solutions from Whey
Fermentation Broth Using Zirconium (IV)
Hydrous Oxide Dynamically Formed Membranes
Brygida Wojtyniak1, Daniela Szaniawska2
1Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology,
Piastow 42, 70-065 Szczecin, Poland
2Maritime University of Szczecin, H. Poboznego 11, 70-507 Szczecin, Poland
Piastow 42, 70-065 Szczecin, Poland
2Maritime University of Szczecin, H. Poboznego 11, 70-507 Szczecin, Poland
Submission date: 2014-03-06
Final revision date: 2014-09-08
Acceptance date: 2014-09-23
Publication date: 2015-05-20
Pol. J. Environ. Stud. 2015;24(3):1387–1393
KEYWORDS
ultrafiltration, hydrous oxide dynamically formed membranes, whey, lactic acid, Lactobacillus acidophilusultrafiltrationhydrous oxide dynamically formed membraneswheylactic acidLactobacillus acidophilus
TOPICS
ABSTRACT
We investigated separation of lactic acid solutions from model fermentation broth using a dynamically
formed ultrafiltration membrane. The model fermentation broth was prepared from whey and Lactobacillus
acidophilus bacteria. The research evaluates the influence of select lactic acid bacteria on fermentation product
quality. The specific objectives of the study were to evaluate the performance of an ultrafiltration membrane
consisting of zirconium oxide stainless steel (ZOSS) on lactic acid purification. We measured the effects
of transmembrane pressure, cross-flow velocity, and initial bacteria concentration of the feed stream on permeate
flux and lactic acid recovery. Experiments to test the lactic acid recovery were conducted at two pressure
levels (1.0 and 2.0 MPa), one bacteria concentration (1 g/dm3), and three values for the cross flow velocity
(0.5 m/s, 1 m/s, and 2.6 m/s). We also evaluated the influence of select lactic acid bacteria on fermentation
product quality.
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