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Dairy industry
Journals / Dairy industry / Issue 2 / Microbiological Stability of Nanofiltered Permeate after Reverse Osmosis
UDC 57

MICROBIOLOGICAL STABILITY OF NANOFILTERED PERMEATE AFTER REVERSE OSMOSIS Microbiological Stability of Nanofiltered Permeate after Reverse Osmosis

Published in Dairy industry · Issue 2 · Pages 78–83 · Rubric: Research Article
DOI: https://doi.org/10.21603/1019-8946-2025-2-36
Received: 18.12.2024 Accepted: 05.02.2025 Published: 10.04.2025 Language of publication: RUS
Authors
AL
Alexey Gavrish
VI
Vitaly Kravtsov
SPIN
GE
Georgy Anisimov
ORCID SPIN
MA
Maria Kosenko
et al.
DM
Dmitry Mamay
SPIN
ABSTRACT
The dairy industry consumes a lot of water per unit of final product. Sustainable water consumption needs effective solutions to reduce wastewater. Wastewater treatment and reuse is a promising approach because dairy nanofiltration permeates are easily filtered with reverse osmosis. The article introduces a storage model and microbiological profile for reverse osmosis permeate obtained by nanofiltration. The pilotscale reverse osmosis involved nanofiltration permeate derived from ultrafiltered milk or cheese whey. The microbiological indicators were analyzed immediately after processing and then after 24 and 72 h of room temperature storage. The analysis included a simulation of industrial storage conditions during 7 days with cooling, as well as biofilm samples from container surface. After 24 h, the reverse osmosis permeate demonstrated negligible microflora. After 72 h, the total microbial count increased by two orders of magnitude, i.e., from 4.42 to 6.48 lg(CFU/mL). After 7 days of storage, the analysis of surface swabs from the containers revealed a total microbial count of 2.85 lg(CFU/mL). To prevent microbial contamination, equipment should be washed daily for room-temperature storage or at least once every 7 days for cold storage. The data obtained may help to optimize water use by dairy facilities, but industrial implementation requires a detailed economic assessment of the purification technology, including the costs of equipment, maintenance, resources, cleaning agents, etc.
KEYWORDS
microbiology, nanofiltration, reverse osmosis, water treatment, biofilms
Funding
Rabota vypolnena pri finansovoy podderzhke Ministerstva nauki i vysshego obrazovaniya Rossiyskoy Federacii v ramkah realizacii kompleksnogo proekta po sozdaniyu vysokotehnologichnogo proizvodstva po teme: «Sozdanie pervogo v Rossii vysokotehnologichnogo proizvodstva prebiotika laktulozy i funkcional'nyh molochnyh ingredientov dlya importozamescheniya v medicine, veterinarii, detskom pitanii, proizvodstve lechebno-profilakticheskih produktov dlya lyudey i zhivotnyh» (Soglashenie o predostavlenii iz federal'nogo byudzheta subsidii na razvitie kooperacii gosudarstvennogo nauchnogo uchrezhdeniya i organizacii real'nogo sektora ekonomiki v celyah realizacii kompleksnogo proekta po sozdaniyu vysokotehnologichnogo proizvodstva № 075-11-2022-021 ot 07.04.2022 g.) v ramkah Postanovleniya Pravitel'stva RF ot 9 aprelya 2010 g. № 218 na baze FGAOU VO «Severo-Kavkazskiy federal'nyy universitet».
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