This study evaluated the potential of extracting acetic acid from rumen fluid by forward osmosis (FO). Unlike other FO applications to extract water and reduce the feed water volume, this research used FO to mimic the ruminant intestines for extracting acetic acid from rumen fluid to a clean matrix with a minimum water flux. The FO extraction of acetic acid was optimised with a synthetic solution using cellulose triacetate (CTA) and thin film composite (TFC) polyamide membranes under different operating parameters (e.g. membrane orientation and stripping solution pH ). Under the same operating conditions the CTA membrane showed higher acetic acid transport than the TFC polyamide membrane. Increasing the stripping solution pH from 5.5–6.5 to 9.0–10.0 increased the acetic acid transport through both CTA and TFC membranes. On the other hand, the membrane orientation had no discernible effect on the transport of acetic acid. Under the optimum conditions, the FO process using the CTA membrane exhibited negligible water flux and extracted 27% of the maximum attainable acetic acid from the synthetic solution within 8 h of operation. The optimised conditions were used to elaborate the FO extraction of acetic acid from a real rumen fluid. Considerably lower extraction rate from the real rumen fluid was observed compared to the synthetic solution, suggesting the need for further research to address the complexity of the rumen matrix.

这项研究评估了通过正向渗透（FO）从瘤胃液中提取乙酸的潜力。与其他FO提取水和减少给水量的应用不同，本研究使用FO模仿反刍动物的肠，将反刍动物的乙酸从瘤胃液中提取到具有最小水通量的干净基质中。使用三乙酸纤维素（CTA）和薄膜复合材料（TFC）聚酰胺膜在不同的操作参数（例如膜取向和汽提溶液pH）下，使用合成溶液对乙酸的FO萃取进行优化。在相同的操作条件下，CTA膜比TFC聚酰胺膜显示出更高的乙酸迁移率。将汽提溶液的pH从5.5-6.5增加到9.0-10.0，可以增加乙酸通过CTA和TFC膜的传输。另一方面，膜的取向对乙酸的运输没有明显的影响。在最佳条件下，使用CTA膜的FO工艺显示出的水通量可忽略不计，并且在操作8小时内从合成溶液中提取了27％的最大可获得乙酸。优化的条件用于详细说明从真正的瘤胃液中FO萃取乙酸的工艺。与合成溶液相比，从真正的瘤胃液中提取的速度要低得多，这表明需要进一步研究以解决瘤胃基质的复杂性。使用CTA膜的FO工艺显示出的水通量可以忽略不计，并且在运行8小时内从合成溶液中提取了27％的最大可达到的乙酸。优化的条件用于详细说明从真正的瘤胃液中FO萃取乙酸的工艺。与合成溶液相比，从真正的瘤胃液中提取的速度要低得多，这表明需要进一步研究以解决瘤胃基质的复杂性。使用CTA膜的FO工艺显示出的水通量可忽略不计，并且在操作8小时内从合成溶液中提取了27％的最大可达到的乙酸。优化的条件用于详细说明从真正的瘤胃液中FO萃取乙酸的工艺。与合成溶液相比，从真正的瘤胃液中提取的速度要低得多，这表明需要进一步研究以解决瘤胃基质的复杂性。