采用三因素二次通用旋转组合实验设计,对蔗渣氧脱浆二氧化氯漂白的主要工艺参数(ClO₂用量、NaOH 用量和漂白时间) 进行了优化,建立了工艺参数与纸浆卡伯值、白度及可吸附有机卤化物(AOX)产生量之间的二次多项式非线性回归数学模型. 结果表明:通过实验设计建立的数学模型回归显著,失拟不明显;3 个工艺参数对纸浆卡伯值、白度及AOX 产生量的影响由大到小的顺序均依次为ClO₂用量、漂白时间、NaOH 用量;在优化模拟得到的较佳工艺条件(ClO₂ 用量0.79%,NaOH 用量0.43%,漂白时间53 min) 下,纸浆卡伯值为1.83,白度为73.3% ISO,废水中AOX 质量浓度为10.8 mg/ L,与验证实验得到的纸浆卡伯值(1.76)、白度(75.0%ISO)和废水中AOX 质量浓度(11.3mg/ L)接近.

Three-factor quadratic general rotary experiment design was made to optimize three main process parame-ters of the chlorine dioxide bleaching of oxygen-delignified bagasse pulp, namely, the ClO₂ dosage, the NaOH do-sage and the bleaching time. Besides, a quadratic polynomial nonlinear regression model describing the relationshipsbetween the process parameters and the Kappa number, the brightness as well as the absorbable organic halide(AOX) content was constructed. The results show that the constructed regression model passes the significance testand fits well, that the three parameters affect the Kappa number, the brightness and the AOX content in a order of ClO₂ dosage>bleaching time>NaOH dosage, and that, in the optimal conditions, namely a ClO₂ dosage of 0.79%,a NaOH dosage of 0.43% and a bleaching time of 53min, the predicated Kappa number, brightness and AOX con-tent respectively reach 1.83, 73.3% ISO and 10.8 mg/ L, which are close to the experimental values of 1.76,75.0%ISO and 11.3mg/ L.