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Current perspectives on acidogenic fermentation to produce volatile fatty acids from waste
Reviews in Environmental Science and Bio/Technology ( IF 14.4 ) Pub Date : 2021-02-13 , DOI: 10.1007/s11157-021-09566-0
Maria Ramos-Suarez , Yue Zhang , Victoria Outram

Volatile fatty acids (VFAs) are key platform chemicals used in a multitude of industries including chemicals, pharmaceuticals, food and agriculture. The current route for VFA production is petrochemical based. VFAs can be biologically produced using organic wastes as substrate, therefore directly contributing to a sustainable economy. This process is commonly known as acidogenic fermentation (AF). This review explores the current research on the development of AF processes optimized for VFA production. Three process steps are considered: feedstock pretreatment, fermentation, and primary product recovery with a focus on in situ recovery. Pretreatment is required for recalcitrant feedstocks, especially lignocellulosic substrates. Different pretreatment techniques for AF application have not been studied in depth. The operational parameters of AF (temperature, pH, hydraulic retention time, substrate concentration, etc.) highly influence microbial activity, VFA yields and product distribution. Optimum conditions are ultimately dependent on substrate composition, however, there is indication that certain operational ranges are beneficial for most feedstocks. VFA recovery and purification are necessary for chemical applications. When recovery is performed in situ, it can help relieve product-induced inhibition and keep alkalinity levels stable enabling further waste degradation. Many techniques have been tested, but none are directly compatible with the fermentation conditions tested. Bio-VFAs have the potential to aid in developing a circular economy, but further development is required. Processes need to be developed with the product market in mind, considering both process integration and systematic process optimization.



中文翻译:

产酸发酵从废物中产生挥发性脂肪酸的最新观点

挥发性脂肪酸(VFA)是在许多行业中使用的关键平台化学品,包括化学,制药,食品和农业。VFA生产的当前路线是基于石化的。VFA可以使用有机废物作为底物进行生物生产,因此直接有助于实现可持续经济。此过程通常称为产酸发酵(AF)。这篇评论探索了针对VFA生产优化的AF工艺开发的当前研究。考虑了三个过程步骤:原料预处理,发酵和初级产品回收,重点是原位回收。顽固性原料(尤其是木质纤维素底物)需要进行预处理。尚未深入研究用于AF应用的不同预处理技术。AF的操作参数(温度,pH,水力停留时间,底物浓度等)在很大程度上影响微生物活性,VFA产量和产品分布。最佳条件最终取决于底物组成,但是,有迹象表明某些操作范围对大多数原料有利。VFA的回收和纯化对于化学应用来说是必需的。在原位进行回收时,它可以帮助减轻产品引起的抑制作用,并使碱度保持稳定,从而进一步降解废物。已经测试了许多技术,但没有一种技术与测试的发酵条件直接兼容。生物VFA有潜力帮助发展循环经济,但需要进一步发展。在开发过程时必须考虑产品市场,

更新日期:2021-02-15
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