Abstract：
The proper treatment and utilization of kraft black liquor, generated from the pulp and paper industry through the kraft pulping method, is required to reduce environmental impacts prior to the final disposal. It also improves the economic performance through the utilization of waste. Microbial valorization appears to demonstrates the dual benefits of waste management and resource recovery by providing an innovative solution to convert kraft black liquor into resource for reuse. A comprehensive review on the microbial valorization of kraft black liquor, describing the role in valorization and management, is still lacking in the literature, forming the rationale of this article. Thus, the present study reviews and systematically discusses the potential of utilizing microorganisms to valorize kraft black liquor as a sustainable feedstock to develop a numerous portfolio of platform chemicals, bioenergy, and other value-added products. This work contributes to sustainability and resource efficiency within the pulp and paper industry. The recent developments in utilization of synthetic biology tools and molecular techniques, including omics approaches for engineering novel microbial strains, for enhancing kraft black liquor valorization has been presented. This review explores how the better utilization of kraft black liquor in the pulp and paper industry contributes to achieving UN Sustainable Development Goals (SDGs), particularly clean water and sanitation (SDG 6) as well as the affordable and clean energy goal (SDG 7). The current review also addresses challenges related to toxicity, impurities, low productivity, and downstream processing that serve as obstacles to the progress of developing highly efficient bioproducts. The new directions for future research efforts to fill the critical knowledge gaps are proposed. This study concludes that by implementing microbial valorization techniques, the pulp and paper industry can transition from a linear to a circular bioeconomy and eco-friendly manage the kraft black liuor. This approach showed to be effective towards resource recovery, while simultaneously minimizing the environmental burden.
摘要：
牛皮纸黑液的适当处理和利用，通过牛皮纸制浆方法从纸浆和造纸工业中产生，需要在最终处置之前减少对环境的影响。它还通过废物的利用提高了经济性能。微生物的价值化似乎通过提供一种创新的解决方案来将牛皮纸黑液转化为资源以供再利用，从而证明了废物管理和资源回收的双重好处。全面综述了硫酸盐黑液的微生物增值，描述在价值化和管理中的作用，仍然缺乏文学，形成本文的基本原理。因此，本研究回顾并系统地讨论了利用微生物来使牛皮纸黑液成为可持续原料以开发大量平台化学品组合的潜力，生物能源,和其他增值产品。这项工作有助于纸浆和造纸工业的可持续性和资源效率。利用合成生物学工具和分子技术的最新进展，包括用于工程化新型微生物菌株的组学方法，提出了提高硫酸盐黑液价值的方法。这篇综述探讨了在纸浆和造纸工业中更好地利用牛皮纸黑液如何有助于实现联合国可持续发展目标（SDGs）。特别是清洁水和卫生设施（SDG6）以及负担得起的清洁能源目标（SDG7）。当前的审查还涉及与毒性有关的挑战，杂质,生产率低,和下游加工成为开发高效生物产品进展的障碍。提出了填补关键知识空白的未来研究工作的新方向。本研究得出的结论是，通过实施微生物增值技术，纸浆和造纸工业可以从线性生物经济过渡到循环生物经济，并对牛皮黑柳进行生态友好的管理。这种方法对资源回收是有效的，同时尽量减少环境负担。
