Biology Department, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada; Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7E 5E1, Canada.
Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7E 5E1, Canada.
Bioresour Technol. 2014 May;159:373-9. doi: 10.1016/j.biortech.2014.03.006. Epub 2014 Mar 12.
The spent liquor (SL) of a neutral sulfite semichemical pulping process contains lignocelluloses that are currently treated in a waste water system. In this work, an adsorption process using activated carbon (AC) was considered for isolating the lignin and hemicelluloses from SL. The maximum adsorptions of 0.9 g/g lignin and 0.43 g/g of hemicelluloses on AC were achieved under the conditions of 30°C, pH 7 and 3h with SL/AC weight ratio of 90. The addition of polydiallyldimethylammonium chloride (PDADMAC) to the SL/AC system significantly improved the adsorption of lignin to 2.5 g/g on AC. The molecular weight of PDADMAC considerably affected the results in that the higher MW PDADMAC led to less lignin, but more hemicelluloses, turbidity and chemical oxygen demand removals from the SL. The thermal analysis also revealed that the higher MW PDADMAC generated precipitates with a lower incineration temperature and heating value.
中性亚硫酸盐半化学制浆的废浆（SL）中含有木质纤维素，目前在废水处理系统中进行处理。在这项工作中，考虑使用活性炭（AC）进行吸附过程，以从 SL 中分离木质素和半纤维素。在 30°C、pH 值 7 和 3 小时的条件下，SL/AC 重量比为 90 时，活性炭对木质素的最大吸附量为 0.9 g/g，对半纤维素的最大吸附量为 0.43 g/g。向 SL/AC 体系中添加聚二烯丙基二甲基氯化铵（PDADMAC）可显著提高活性炭对木质素的吸附能力，达到 2.5 g/g。PDADMAC 的分子量对结果有很大影响，即较高 MW 的 PDADMAC 导致 SL 中的木质素减少，但半纤维素、浊度和化学需氧量的去除率增加。热分析还表明，较高 MW 的 PDADMAC 生成的沉淀物具有较低的焚烧温度和热值。
