Pilot Study on the Removal of Lactic Acid and Minerals from Acid Whey Using Membrane Technology
| Autor: | Sahar Talebi, Xia Chen, Sandra E. Kentish, Karren Bathurst, Francisco Suarez, George Q. Chen |
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| Rok vydání: | 2020 |
| Předmět: |
2. Zero hunger
Renewable Energy Sustainability and the Environment Chemistry General Chemical Engineering Pilot scale Ultrafiltration food and beverages 02 engineering and technology General Chemistry Permeation Electrodialysis 010402 general chemistry 021001 nanoscience & nanotechnology Pulp and paper industry 01 natural sciences 7. Clean energy 6. Clean water 0104 chemical sciences Membrane technology Lactic acid chemistry.chemical_compound Environmental Chemistry Nanofiltration Lactose 0210 nano-technology |
| Zdroj: | ACS Sustainable Chemistry & Engineering. 8:2742-2752 |
| ISSN: | 2168-0485 |
| Popis: | Acid whey presents a major disposal issue for the dairy industry due to its high lactic acid and mineral concentrations. In this work, the feasibility of using membrane technology to treat acid whey to produce high quality whey powder was demonstrated at pilot scale. Three process combinations were tested, namely, (1) ultrafiltration and electrodialysis; (2) ultrafiltration, nanofiltration, and electrodialysis; and (3) ultrafiltration, dia-nanofiltration, and electrodialysis. All three combinations were successful in reducing the levels of lactic acid and minerals in acid whey. However, the lowest ratio between lactic acid and lactose (0.017 g lactic acid/g of lactose) was obtained with the process that utilized dia-nanofiltration. The energy required for the electrodialysis of the ultrafiltration permeate and dia-nanofiltration retentate were comparable (7.5 and 7.8 kWh/tonne of feed, respectively). However, the dia-nanofiltration retentate was at least 3.5 times more concentrated than the ultrafiltration permeate, thus reducing the annual energy consumption and capital investment of the electrodialysis unit. The product of the nanofiltration and electrodialysis process was successfully dried to produce a powder with an ash and moisture content of 4% and 2.5%, respectively. |
| Databáze: | OpenAIRE |
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