制浆废液中溶解木素的壳多糖可絮凝性

Floccubility of chitosan and its application in separating soluble lignin from pulping waste liquor

用絮凝方法分离溶解木素,是造纸废液综合利用的新途径。介绍了关于新型絮凝剂壳多糖絮凝性的研究及其应用效果。分别对亚硫酸氢镁法苇浆、碱法麦草浆、中性亚硫酸钠法苇浆3种制浆废液进行实验研究。结果表明,在适宜的条件下,废液中的固形物、有机物、无机物及CODCr都有较高的去除率(52%～70%);固形物和有机物的絮凝效果:亚硫酸氢镁法苇浆废液最优,其次为碱法麦草浆废液,再其次为中性亚硫酸钠法苇浆废液;CODCr的絮凝效果:中性亚硫酸钠法苇浆废液最优,其次为亚硫酸氢镁法苇浆废液,再其次为碱法麦草浆废液。光谱分析证明,废液的溶解木素部分被絮凝沉降,部分保留在澄清液中。

Separating soluble lignin in pulping waste liquor by using flocculant is a prospective approach. This paper describes the investigation on the floccubility of chitosan, a new kind of flocculant, and its application。The flocculation of three pulping(reed magnesium bisulfite, wheat str aw alkaline, reed neutral sulfite)waste liquor with chitosan is studied. It shows that all the solid, organic, inorganic matter, and CODCr in waste liquor have higher removing rate(52%－70%)under suitable conditions. The flocculating effects of solid and organic matter for different kinds of waste liquor is listed in sequence from higher to lower: bisulfite,alkaline,neutral sulfite; while the flocculating effects of CODCr is: neutral sulfite,bisulfite,alka line. Spectral analysis reveals that the soluble lignin of pulping waste liquor is flocculated and deposited partly, and the other part is retained in the cleared liquor.