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研究麦草碱法浆ECF漂白过程中随着漂剂用量的改变,漂白浆性能及污染负荷的变化情况,并与CEH漂白进行了对比。结果表明:同一H2O2用量条件下(2%),卡伯因子从0.075增加到0.25,纸浆白度显著升高,从75.10%ISO升高到82.34%ISO;CODCr从38.10kg·t-1未漂浆增加到39.91kg·t-1未漂浆;BOD5从8.70kg·t-1未漂浆增加到10.80kg·t-1未漂浆。同一卡伯因子(0.15)条件下,H2O2用量从1.0%增加到3.0%,纸浆白度增加有限,污染负荷却会大幅增加。纸浆如需漂至78%ISO(或80%ISO),且污染负荷维持在一个相对较低水平,卡伯因子不小于0.15(或0.20)。CEH漂白AOX产生量是ECF漂白的7倍。
To study the change of bleaching agent and the load of bleaching pulp during ECF bleaching of wheat straw alkaline pulp, and to compare with CEH bleaching. The results showed that the whiteness of pulp increased significantly from 75.10% ISO to 82.34% ISO with the same H2O2 dosage (2%) and the Kappa factor increased from 0.075 to 0.25. The CODCr did not drift from 38.10kg · t-1 Pulp increased to 39.91kg · t-1 unbleached pulp; BOD5 from 8.70kg · t-1 unbleached pulp increased to 10.80kg · t-1 unbleached pulp. Under the same Kappa factor (0.15), the amount of H2O2 increased from 1.0% to 3.0%, the increase of whiteness of pulp was limited, but the load of pollution increased significantly. For a pulp that blends to 78% ISO (or 80% ISO) and maintains a relatively low pollution load, the kappa factor is not less than 0.15 (or 0.20). CEH bleaching AOX production is 7 times that of ECF bleaching.