Cooking with active oxygen and solid alkali (CAOSA), a oxygen delignification process for lignocellulose fractionation was developed by our group. In this study, a treatment process for yellow liquor, which is the aqueous solution of the CAOSA process, was proposed whilst producing formic and acetic acids with hydrothermal deep oxidation. A series of experiments were performed at reaction temperature of 160–280 °C and residence time of 30 s to 30 min. The highest yield of the acids defined as the total mass percentage of formic and acetic acids to biomass feedstock is 21.47%. The highest yield which defined as the percentage of carbon content relative to the total organics in the yellow liquor is 57.01%. Our results show that the process could be a universal and effective to other wastewater from the traditional pulping processes.

我们的团队开发了使用活性氧和固体碱（CAOSA）进行烹饪的方法，该方法开发了一种用于木质素纤维素分馏的氧气去木质素工艺。在这项研究中，提出了一种黄液的处理工艺，它是CAOSA工艺的水溶液，同时通过水热深度氧化生产甲酸和乙酸。在160-280°C的反应温度和30 s至30 min的停留时间下进行了一系列实验。酸的最高收率定义为甲酸和乙酸相对于生物质原料的总质量百分比为21.47％。最高收率定义为黄液中碳含量相对于总有机物的百分比，为57.01％。我们的结果表明，该工艺对于传统制浆工艺中的其他废水可能是通用且有效的。