Efficiently enhanced short-chain fatty acids (SCFAs) recovery from food waste condensate: Real-time wettability monitoring with supported liquid membrane contactor

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Water Research Pub Date : 2025-04-15 Epub Date: 2025-01-04 DOI:10.1016/j.watres.2025.123093

Hongrae Im, Duc Anh Nguyen, Dong-gun Jun, Sojeong Jang, Am Jang

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Abstract

Food waste condensate (FWC) is a valuable source for recovering short-chain fatty acids (SCFAs) through methods such as supported liquid membrane contactors. Containing organic compounds like acetate, propionate, and butyrate, FWC offers a rich substrate for efficient SCFA extraction. Recovering SCFAs from FWC provides notable environmental advantages, including reducing waste and generating high-value products for industries such as bioenergy and chemical production. This process not only contributes to carbon neutrality by recycling waste streams but also establishes a sustainable method for producing bio-based products from FWC. This study investigated the recovery efficiency and transport mechanisms of SCFAs from SCFA-rich wastewater (e.g., FWC) using both virgin hydrophobic PVDF membranes and membranes filled with organic extractants like tertiary amines (trihexhylamine and trioctylamine) and tertiary phosphines (trihexylphosphine and trioctylphosphine). Recovery efficiency for butyric acid was significantly improved when TOA (trioctylamine) was used, achieving 71.96 %, while acetic acid showed a lower recovery of 0.95 %, highlighting TOA's strong affinity for butyric acid due to ion-amine complex formation. The study also utilized real-time optical coherence tomography (OCT)-based monitoring to observe membrane wetting, finding that the virgin PVDF membrane was more prone to wetting and fouling, with a significant reduction in contact angle and surface energy. In contrast, the PVDF-TOA membrane demonstrated better resistance to wetting, showing minimal changes in contact angle and porosity, underscoring its potential for long-term applications in membrane contactors.

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高效增强短链脂肪酸（SCFAs）从食物垃圾冷凝水回收：实时润湿性监测与支撑液膜接触器

食物垃圾冷凝水（FWC）是通过支撑液膜接触器等方法回收短链脂肪酸（SCFAs）的宝贵来源。FWC含有有机化合物，如醋酸酯、丙酸酯和丁酸酯，为高效提取SCFA提供了丰富的底物。从FWC中回收scfa具有显著的环境优势，包括减少废物和为生物能源和化学生产等工业生产高价值产品。这一过程不仅通过回收废物流有助于碳中和，而且还建立了一种可持续的方法来生产FWC生物基产品。本研究使用纯疏水性PVDF膜和填充叔胺（三己胺和三辛基胺）和叔膦（三己基膦和三辛基膦）等有机萃取剂的膜，研究了从富scfa废水（如FWC）中回收scfa的效率和转运机制。使用TOA（三辛胺）对丁酸的回收率显著提高，达到71.96%，而乙酸的回收率较低，为0.95%，说明TOA对丁酸的亲和力较强，形成离子胺配合物。该研究还利用基于实时光学相干断层扫描（OCT）的监测来观察膜的润湿情况，发现未加工的PVDF膜更容易发生润湿和结垢，接触角和表面能显著降低。相比之下，PVDF-TOA膜表现出更好的抗润湿性，其接触角和孔隙率的变化很小，强调了其在膜接触器中的长期应用潜力。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.