Water Pollution Research Department, National Research Centre, Giza, 12622, Egypt.
Environmental Engineering Department, Zagazig University, Zagazig, 44519, Egypt.
Chemosphere. 2022 Jun;296:133812. doi: 10.1016/j.chemosphere.2022.133812. Epub 2022 Feb 9.
The global trend is shifting toward circular economy systems. It is a sustainable environmental approach that sustains economic growth from the use of resources while minimizing environmental impacts. The multiple industrial use of microalgal biomass has received great attention due to its high content of essential nutrients and elements. Nevertheless, low biomass productivity, unbalanced carbon to nitrogen (C/N) ratio, resistant cellular constituents, and the high cost of microalgal harvesting represent the major obstacles for valorization of algal biomass. In recent years, microalgae biomass has been a candidate as a potential feedstock for different bioenergy generation processes with simultaneous treating wastewater and CO capture. An overview of the appealing features and needed advancements is urgently essential for microalgae-derived bioenergy generation. The present review provides a timely outlook and evaluation of biomethane production from microalgal biomass and related challenges. Moreover, the biogas recovery potential from microalgal biomass through different pretreatments and synergistic anaerobic co-digestion (AcoD) with other biowastes are evaluated. In addition, the removal of micropollutants and heavy metals by microalgal cells via adsorption and bioaccumulation in their biomass is discussed. Herein, a comprehensive review is presented about a successive high-throughput for anaerobic digestion (AD) of the microalgal biomass in order to achieve for sustainable energy source. Lastly, the valorization of the digestate from AD of microalgae for agricultural reuse is highlighted.
全球趋势正在向循环经济体系转变。这是一种可持续的环境方法，它在维持经济增长的同时，最大限度地减少对环境的影响，从资源的利用中获得可持续性。由于微藻生物质含有丰富的必需营养物质和元素，其多种工业用途受到了极大的关注。然而，低生物质生产力、不平衡的碳氮比（C/N）、抵抗细胞成分和微藻收获的高成本，是实现藻类生物质增值的主要障碍。近年来，微藻生物质已成为不同生物能源生产过程的潜在原料，同时还可以处理废水和 CO2 捕获。概述吸引人的特征和所需的进展对于微藻衍生生物能源的产生至关重要。本综述提供了一个及时的展望和评估微藻生物质生产生物甲烷的相关挑战。此外，还评估了通过不同预处理和与其他生物废物协同厌氧共消化（AcoD）从微藻生物质中回收沼气的潜力。此外，还讨论了微藻细胞通过吸附和生物积累在其生物质中去除微量污染物和重金属的情况。本文对微藻生物质的厌氧消化（AD）进行了全面的综述，以实现可持续能源。最后，强调了 AD 微藻消化物在农业再利用方面的增值。
