厌氧发酵强化酒糟生物炭吸附CO₂特性研究

Study on CO₂ Adsorption Characteristics of Vinasse Biochar Enhanced by Anaerobic Fermentation

摘要: 酒糟是酿酒行业的主要副产物且年产量巨大，实现酒糟的资源化利用将有助于该行业可持续发展。为提高酒糟的资源化利用水平，开展了厌氧发酵酒糟产甲烷试验，并利用酒糟发酵后的残渣制备了生物炭，考察了该生物炭对CO₂的吸附性能。结果表明，酒糟发酵过程中加入竹炭可提高甲烷产量，当竹炭与酒糟质量比为1:1时，甲烷产量可达462.7 mL/g，高于未掺杂竹炭的酒糟产甲烷量(388.8 mL/g)。投加竹炭后所制备的沼渣生物炭具有更佳的孔隙结构和更高的CO₂吸附量，其比表面积较未投加竹炭的沼渣生物炭可提高159%，对CO₂的吸附量提高了62.5%，达到34.75 mg/g。通过伪一级和伪二级动力学模型研究了生物炭对CO₂的吸附，发现伪一级动力学模型能更好地描述生物炭对CO₂的吸附，表明生物炭对CO₂以物理吸附为主。

Abstract: Vinasse is the primary by-product of the liquor industry, and its annual output is substantial. The effective utilization of vinasse can significantly contribute to the sustainable development of the liquor industry. To enhance the utilization of vinasse, an experiment was conducted to perform anaerobic fermentation of vinasse for methane production, and biochar was prepared from the fermentation residue. The adsorption performance of the biochar for CO₂ was investigated. The results indicated that the methane yield could be increased by incorporating bamboo biochar (BB) during the fermentation of vinasse. When the mass ratio of BB to vinasse was 1:1, the methane yield reached 462.7 mL/g, surpassing the yield obtained without the addition of BB, which was 388.8 mL/g. The vinasse residue biochar (VRB) produced with BB exhibited a superior pore structure and higher CO₂ adsorption capacity compared to that produced without BB. The specific surface area of VRB prepared with BB was 159% greater than that of the biochar without BB, and the CO₂ adsorption capacity increased by 62.5%, reaching 34.75 mg/g. The pseudo-first-order and pseudo-second-order kinetic models were employed to analyze the CO₂ adsorption by biochar. It was found that the pseudo-first-order kinetic model more accurately described the CO₂ adsorption on biochar, indicating that physical adsorption predominantly governs the CO₂ uptake by biochar.