Redox-mediated electrochemical desalination for waste valorization in dairy production
Redox-mediated electrochemical desalination for waste valorization in dairy production
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DOI：
10.1016/j.cej.2021.131082
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发表时间：
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影响因子：
15.1
通讯作者：
Nayeong Kim;Jemin Jeon;J. Elbert;Choonsoo Kim;Xiao Su
中科院分区：
文献类型：
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作者：
Nayeong Kim;Jemin Jeon;J. Elbert;Choonsoo Kim;Xiao Su
随着全球人口的迅速增长，实现可持续粮食生产是缓解密切相关的环境和营养危机的关键挑战。随着乳制品需求的增加，产生了大量乳清——这是食品制造过程中污染严重的副产品，具有严格的处置规定。然而，乳清已被认为是一种有吸引力的营养来源；因此，用于脱除乳清废物中高浓度盐的可持续分离技术可以为食品加工废物中乳清蛋白的增值提供途径。在此，我们提出了一种可持续且节能的策略，通过氧化还原介导的电渗析系统来稳定乳清废物的价值。作为净零废物工艺，我们的系统利用可逆氧化还原反应进行连续脱盐和盐浓缩以供再利用，并同时回收高度纯化的蛋白质含量。该系统在各种操作参数（电压、pH 值和盐浓度）下，除盐率高达 99%，并且保留超过 98% 的乳清蛋白。值得注意的是，蛋白质纯化和盐回收的性能在多个循环中得以保持，表现出出色的稳定性和可循环性。此外，技术经济分析证实了我们系统的经济潜力，与传统海水淡化系统相比，能耗降低了 51-73%，运营支出降低了 51-62%。总体而言，我们的氧化还原电化学工艺为从乳制品生产废物中回收有价值的蛋白质提供了一个可持续的电气化平台，并预计未来与可再生电力相结合。
With the rapidly growing global population, achieving sustainable food production is a key challenge to mitigate the closely coupled environmental and nutrition crises. As demand for dairy products increases, large volumes of whey are produced–a highly polluting byproduct from food manufacturing, with strict disposal regulations. However, whey has been recognized as an attractive nutrient source; and as such, sustainable separation technologies for demineralizing the highly concentrated salts in whey waste can provide a pathway for the valorization of whey proteins from food processing waste. Herein, we propose a sustainable and energy-efficient strategy to valorize whey waste via a redox-mediated electrodialysis system. As a net-zero waste process, our system leverages reversible redox reaction for continuous desalination and salt concentration for reuse, as well as the simultaneous recovery of highly purified protein contents. The system demonstrates up to 99% salt removal with> 98% of whey proteins retained at various operating parameters: voltages, pHs, and salt concentrations. Remarkably, the performance of protein purification and salt recovery was maintained over multiple cycles, demonstrating outstanding stability and cyclability. Furthermore, a techno-economic analysis confirms the economic potential of our system with 51-73% lower energy consumptions and 51-62% lower operating expenditure than conventional desalination systems. Overall, our redox-electrochemical process offers a sustainable and electrified platform for the recovery of valuable proteins from dairy production waste, with envisioned integration with renewable electricity in the future.