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Will Membranes Break Barriers on Volatile Fatty Acid Recovery from Anaerobic Digestion?
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-10-01 , DOI: 10.1021/acsestengg.0c00081 Xiaobo Zhu 1 , Aaron Leininger 1 , David Jassby 2 , Nicolas Tsesmetzis 3 , Zhiyong Jason Ren 1
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-10-01 , DOI: 10.1021/acsestengg.0c00081 Xiaobo Zhu 1 , Aaron Leininger 1 , David Jassby 2 , Nicolas Tsesmetzis 3 , Zhiyong Jason Ren 1
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The conversion of organic waste into value-added chemicals provides a sustainable pathway toward a circular economy, but anaerobic digestion (AD) as an established technology has faced great challenges primarily due to the low value of its primary product—biogas. Recent developments on arrested methanogenesis allow the AD process to be rewired to suppress methanogenesis and promote the production of higher valued volatile fatty acids (VFAs). However, the separation and recovery of VFAs from the mixed reactor constituents (microbes, salt, and organic solids), remains a challenge. Membrane-based separation processes are showing increased promise compared to other methods, as recent studies reported high yield, high selectivity VFA recovery with low energy consumption and reactor footprint. However, competing membrane processes have not been quantitatively reviewed or compared, making it difficult to understand the current state-of-the-art. This study provided the first such analysis, comparing nanofiltration (NF), reverse osmosis (RO), pervaporation (PV), membrane contactors (MC), and membrane distillation (MD) for VFA separation and recovery. The study offers a comprehensive characterization of the different membrane’s selectivity and permeability under different conditions and compares them side-by-side using normalized measures. In addition, the energy demand and fouling potential were also analyzed. New opportunities such as mixed matrix pervaporation membrane, antifouling electroactive membrane, solar-heating membrane distillation, and integrated processes were also explored to provide insights on technology advancement and synergistic benefits.
中文翻译：
膜会打破厌氧消化中挥发性脂肪酸回收的障碍吗？
将有机废物转化为增值化学品为循环经济提供了可持续的途径，但是作为一项成熟技术，厌氧消化（AD）面临着巨大挑战，这主要是因为其主要产品沼气的价值较低。被阻止的甲烷生成的最新进展允许重新连接AD过程以抑制甲烷生成并促进更高价值的挥发性脂肪酸（VFA）的产生。然而，从混合反应器成分（微生物，盐和有机固体）中分离和回收VFA仍然是一个挑战。与其他方法相比，基于膜的分离工艺显示出更大的前景，因为最近的研究表明，该工艺具有高收率，高选择性VFA回收率，低能耗和反应器占地面积等优点。然而，尚未对竞争的膜工艺进行定量审查或比较，因此难以了解当前的最新技术水平。这项研究提供了第一个此类分析，比较了用于VFA分离和回收的纳滤（NF），反渗透（RO），全蒸发（PV），膜接触器（MC）和膜蒸馏（MD）。这项研究提供了在不同条件下不同膜的选择性和渗透性的全面表征，并使用归一化方法对它们进行了比较。此外，还分析了能源需求和结垢潜力。混合基质渗透蒸发膜，防污电活性膜，太阳能加热膜蒸馏等新机遇
更新日期：2020-10-01
中文翻译：
膜会打破厌氧消化中挥发性脂肪酸回收的障碍吗？
将有机废物转化为增值化学品为循环经济提供了可持续的途径，但是作为一项成熟技术，厌氧消化（AD）面临着巨大挑战，这主要是因为其主要产品沼气的价值较低。被阻止的甲烷生成的最新进展允许重新连接AD过程以抑制甲烷生成并促进更高价值的挥发性脂肪酸（VFA）的产生。然而，从混合反应器成分（微生物，盐和有机固体）中分离和回收VFA仍然是一个挑战。与其他方法相比，基于膜的分离工艺显示出更大的前景，因为最近的研究表明，该工艺具有高收率，高选择性VFA回收率，低能耗和反应器占地面积等优点。然而，尚未对竞争的膜工艺进行定量审查或比较，因此难以了解当前的最新技术水平。这项研究提供了第一个此类分析，比较了用于VFA分离和回收的纳滤（NF），反渗透（RO），全蒸发（PV），膜接触器（MC）和膜蒸馏（MD）。这项研究提供了在不同条件下不同膜的选择性和渗透性的全面表征，并使用归一化方法对它们进行了比较。此外，还分析了能源需求和结垢潜力。混合基质渗透蒸发膜，防污电活性膜，太阳能加热膜蒸馏等新机遇
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