ECF漂白废水回用对产污负荷的影响研究

Effect of ECF Bleaching Effluent Recycling on the Pollution Load

将麦草浆ECF漂白（DQP）中的P段洗涤废水用于D段漂后浆料的洗涤，初步探讨P段洗涤废水回用对漂白废水污染负荷及浆料性能的影响。结果表明，P段洗涤废水回用后，漂后浆料白度升高1—2个百分点，黏度略有下降；不同漂剂用量下，漂白废水CODc，下降0—2．5kg／t漂白浆，BOD5下降2．1～2．9kg／t漂白浆，AOX下降17％～20％，漂白废水产生量减少30％。

The effect of ECF bleaching effluent recycling（using P-stage filtrate to wash D-stage pulp） on the pollution load and pulp proper- ties was studied. The results showed that, by recycling P-stage filtrate, the bleached pulp whiteness increased by 1 - 2 perceatage, while vis- cosity decreased slightly; CODcr decreased by 0 - 2.5 kg/t bleached pulp and BODs decreased by 2.1 -2.9 kg/t bleached pulp,while AOX decreased by 17% -20%. and effluent amount reduced by 30%.