麦草浆ECF漂白废水污染负荷研究

Study on the Effluent of Wheat Straw Pulp ECF Bleaching

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。

The effects of bleaching agent charge on pollution load and pulp properties were studied and compared with the CEH bleaching. It revealed that at a certain H2O2 charge （2%）, kappa factor increased from 0.075 to 0.25, the whiteness increased significantly from 75.10% ISO to 82.34% ISO, CODcr increased from 38.10 kg·t^-1 unbleached pulp to 39.91 kg·t^-1 unbleached pulp, and BOD5 increased from 8.70 kg·t^-1 unbleached pulp to 10.80 kg·t^-1 unbleached pulp. At certain kappa factor（0.15）, the dosage of H2O2 increased from 1.0% to 3.0%, pulp whiteness increased slightly, while pollution load increased sharply. When kappa factor is above 0.15 or 0.20, the pulp whiteness can be up to 78% ISO or 80% ISO, on condition of the pollution load is still low. The AOX formation of CEH bleaching is seven times of ECF bleaching.