【作者】 孙兵；

【导师】 张运展；

【作者基本信息】 大连轻工业学院 ， 制浆造纸工程， 2005， 硕士

【摘要】 本文分别采用隔膜电解(MAE)和超滤(UF)处理技术，对杨木中性亚硫酸钠—蒽醌法(NS—AQ)和碱性亚硫酸钠—蒽醌法(AS—AQ)废液进行降灰处理，并优化其实验条件，研究膜的处理特性。采用隔膜电解处理NS—AQ杨木废液时，在固定电解温度25℃、废液体积：稀碱液体积=1：2、沉淀剂用量0.6mol／L条件下，其最佳实验条件为：废液固形物含量10％，稀碱液的浓度为0.1mol／L，电解电压为8v，阳极面积为50cm~2，阴极面积为99cm~2，电解时间180min。经过此条件处理后的废液，其灰分由原废液的33.54％(NaOH计)降低到电解后的23.62％，下降了9.92个百分点。用隔膜电解处理AS—AQ法杨木废液时，其最佳实验条件为：废液固形物含量8％，稀碱液的浓度为0.1mol／L，电解电压为8v，阳极面积为37.5cm~2，阴极极面积为81cm~2，电解时间180min。废液灰分由原废液的31.42％(NaOH计)降低到电解后的19.66％，灰分下降了11.76个百分点。这种处理方法对AS—AQ法杨木废液的降灰效果要好于NS—AQ杨木废液。在温度为15℃条件下，采用超滤技术分别对NS—AQ和AS—AQ法杨木废液处理时，NS—AQ法杨木废液处理的最佳条件是：超滤膜截留分子量为1万、废液固形物含量10％、操作压力0.20Mpa、滤液体积分数为30％。在此条件下，超滤后废液灰分为24.51％(降低4.97个百分点)，木素截留率为79.98％，无机物脱出率为38.42％，有机物流失率为20.72％。在有效的降灰的同时，保证了木素分子的截留。在同样的温度条件下，对AS—AQ法杨木废液进行处理时，其最佳条件是：超滤膜截留分子量为1万、废液固形物含量10％、操作压力0.25Mpa、滤液体积分数为60％。经此条件处理后，废液灰分为23.8％(降低7个百分点)，木素截留率为70.87％，无机物脱出率为60.99％，有机物流失率为44.41％。综合来讲，对NS—AQ法和AS—AQ法杨木废液处理时，隔膜电解法选择性降灰效果较超滤法好；而经济效益上，隔膜电解法优于超滤法。更多还原

【Abstract】 In this paper, adopting membrane—assisted electrolysis (MAE) technology andultrafiltration (UF) technology to decrease the inorganic ash content of neutral sodiumsulphite anthraquinone (NS-AQ) aspen pulping waste liquor and Alkaline sodium sulphiteanthraquinone (AS-AQ) aspen pulping waste liquor, get the optimum experiment conditionand investigate the characteristic of membrane technology.Processing NS-AQ waste liquor with membrane—assisted electrolysis technology, underfixed electrolysis temperature is 25℃,waste liquor volume: alkaline liquor volume is 1:2,precipitate charge is 0.06mol/L condition, the optimum experiment conditions are as follows:waste liquor solid content is 10％, alkaline liquor density is 0.1mol/L, electrolysis voltage is8v, anode area is 50cm~2, cathode area is 99cm~2, electrolysis time is 3h. After the aboveprocessing, the waste liquor inorganic ash content is decreased by 9.92％, from the original33.54％(as NaOH) to 23.62％.While processing AS-AQ waste liquor with membrane—assisted electrolysis technology,under fixed electrolysis temperature 25℃,waste liquor volume: alkaline liquor volume=1:2, precipitate charge is 0.06mol/L condition, the optimum experiment conditions areas follows: waste liquor solid content is 8％, alkaline liquor density is 0.1mol/L,electrolysis voltage is 8v, anode area is 37.5cm~2, cathode area is 81cm~2, electrolysis time is 3h.The waste liquor inorganic ash content is decline from the original 31.42％(as NaOH) to19.66％, it is descend 11.76％.When the temperature is 15℃, adopting ultrafiltration technology, the optimumexperiment conditions of NS-AQ waste liquor are as follows: ultrafiltration membraneintercept molecular weight is ten thousand, waste liquor solid content is 10％, operationpressure is 0.2Mpa, filtered liquor volume percentage is 30％.Under the optimum condition,ultrafiltrated waste liquor inorganic ash content is 24.51％,lignin cutoff rate is 79.98％,inorganic matter takeoff rate is 38.42％, organic matter takeoff rate is 20.72％. In this method,it can validly decrease inorganic ash content and the lignin can be keep validly.To AS-AQ waste liquor, under 15℃, the optimum experiment conditions are as follows: ultrafiltration membrane intercept molecular weight is ten thousand, waste liquor solidcontent is 10％, operation pressure is 0.25Mpa, filtered liquor volume percentage is 60％.Under the optimum condition, ultrafiltrated waste liquor inorganic ash content is 23.8％,lignin cutoff rate is 70.87％, inorganic matter takeoff rate is 60.99％, organic matter takeoffrate is 44.41％.In summary, to the processing of NS-AQ and AS-AQ aspen pulping waste liquor, MAE isbetter than UF in inorganic ash content decreasing, while UF is better than MAE in economy.更多还原