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[Display omitted] • The harvesting efficiency achieved 99.2 % with the application of 60 g/L of FMT@DTAB. • PVDF integrated with extractants demonstrated enhanced butyric acid mass transfer. • Butyric acid showed improved mass transfer coefficient in PVDF with extractants. • PVDF-TDA achieved a 60 % recovery efficiency for butyric acid with 60 g/L of FMT@DTAB. Syngas fermentation utilizing acetogenic bacteria like Clostridium sp. provides a promising method for transforming CO and CO 2 -rich waste gases into valuable products such as short-chain fatty acids (SCFAs) and bio-alcohols, aiding in the reduction of greenhouse gas emissions and supporting carbon neutrality objectives. Magnetic nanoparticle-based coagulants, particularly Fe 3 O 4 @MIL-100(Fe)@TEOS@DTAB (FMT@DTAB), have recently attracted attention due to their efficient recovery and enhanced cell disruption capabilities enabled by cationic surfactant surface modifications. At a dosage of 60 g/L, FMT@DTAB has proven highly effective in achieving significant concentrations of acetic acid (7.06 g/L), butyric acid (6.27 g/L), ethanol (6.43 g/L), and butanol (5.24 g/L), along with notable harvesting efficiency (99.2 %) and intracellular ATP concentration (2.1 mM). Recent research on supported liquid membrane contactors highlights their cost-effective and environment-friendly properties, with an emphasis on minimal extractant usage. This study investigated the behavior of SCFAs using both virgin and supported liquid membrane contactors, focusing on factors such as organic extractant and membrane pore size. PVDF filled with tridodecylamine notably improved butyric acid recovery to around 60 %, with a mass flux of 14.95 ± 0.28 g/m2/h, outperforming virgin and other extractant-filled PVDF membranes. This study enhances resource efficiency and reduces industrial environmental impacts by optimizing the recovery and production of valuable chemicals from waste gases. It supports sustainable and economically viable biotechnology applications, aligning with global climate change mitigation efforts. [ABSTRACT FROM AUTHOR]

[Display omitted] • A two-stage cultivation strategy can increase both biomass and target product yield. • Sequential and multi-component extraction lead to downstream resource efficiency. • Seawater, wastewater, and recycled nutrients are crucial in maintaining efficiency. • Integrative design navigates trade-offs between environmental and economic aspects. • Life Cycle Costing and Sustainability Assessment broaden well-to-wheel analysis. Microalgae hold tremendous potential as sustainable bioresources in carbon capture, climate change mitigation, and the development of net-zero lifestyles. However, scaling up microalgae cultivation necessitates overcoming obstacles in strain selection, bioreactor design, and cultivation strategies. While microalgae were initially viewed as a simple biomass feedstock for energy security, emerging applications such as wastewater bioremediation, carbon capture, and the production of valuable chemicals have reshaped the overall perspective of microalgae. Exciting advancements in microalgal genetic engineering, encompassing evolutionary approach, CRISPR technology, modular cloning toolkits, and bioinformatics, pave the way for optimizing productivity and minimizing environmental footprints. This review delves into crucial aspects of microalgae cultivation, including harvesting, cell disruption, and waste valorization. Additionally, new understandings of integrative design and life-cycle assessment are discussed alongside the promise of bioenergy production, providing the current stage of development and challenges to handle. Ultimately, this review offers new perspectives on microalgal biotechnology aiming to contribute to an eco-friendly green paradigm. [ABSTRACT FROM AUTHOR]

• A review of the spectrum of emerging Direct Air Capture, DAC technologies. • Several categories are under different levels of development with different working principles. • A widespread data on DAC technical, economic, and environmental performance. • Lack of standardized frameworks for DAC assessment. • Multicriterial assessment frameworks can provide comprehensive guidance for rapid deployment. Direct air capture (DAC) is set to play a crucial role in meeting climate change targets as most recent climate scenarios rely on its large-scale implementation. Nevertheless, despite this widespread consensus, DAC performance and impact have not been sufficiently investigated, which has resulted in hindering its wide-scale deployment for climate change mitigation initiatives. Here, we present a comparative review of different DAC technologies and examine their performance from a holistic perspective by considering different aspects, from technical, commercial, and economic to environmental. We classify DAC technologies into five main categories, namely (i) liquid scrubbing, (ii) solid sorbent, (iii) electrochemical, (iv) cryogenic, and (v) membrane, and within each category, various approaches can be employed. We explore key challenges involved in developing each DAC technology and compare their performance using up-to-date data. We then critically analyze the primary factors contributing to the inconsistencies arising from the economic assessment results and provide valuable guidelines for future studies. Overall, the present review can benefit researchers, engineers, and policymakers in obtaining a holistic understanding of these state-of-the-art technologies in addition to filling key gaps in the DAC field. [ABSTRACT FROM AUTHOR]