【摘要】 为定量表征黑液提取率对纸浆中残留污染负荷的影响,以红松传统碱法蒸煮得到的浆料和黑液为研究对象,采用逆流提取工艺,对不同浆料浓度的黑液提取率与浆中残余木质素量、化学需氧量(COD_Cr)和生化需氧量（BOD₅）的关系进行研究.结果表明:木质素降解物是黑液有机物的主要污染来源,高浓高黑液提取率可有效降低污染负荷,浆料浓度从15%提高到35%时,黑液提取率显著增高（从71. 34%提高到98. 47%）,并且浆中残余木质素、COD_Cr和BOD₅的含量都大幅度降低;黑液提取率与浆中残余木质素呈线性关系,与浆中残留的COD_Cr和BOD₅分别呈一元三次函数和一元二次函数关系.提高浆料浓度和黑液提取率是减少制浆和漂白过程中污染负荷的有效方法.更多还原

【Abstract】 In order to quantitatively characterize the effects of extraction ratio of black liquor on residual pollution load of pulp,traditional alkaline cooking was used to cook the pinus koraiensis,and the countercurrent extraction process was used to extract the black liquor. The relationship between the extraction rate of black liquor and the residual lignin content,chemical oxygen demand( COD_Cr ) and biochemical oxygen demand（ BOD₅） in different pulp concentrations were studied. The results show that the lignin degradation products are the main source of pollution of black liquor organic matter,and the high concentration of high black liquor extraction rate can effectively reduce the pollution load. When the extraction rate of high black liquor increases from 71. 34% to 98. 47%,the content of residual lignin,COD_Cr and BOD₅ in the pulp are significantly reduced. The extraction ratio of black liquor is linearly related to remained lignin in pulps,and the remained COD_Cr and BOD₅ in pulps have cubic function of one variable and a uni-variable and hyperbolic relationship respectively. The results show that the high concentration of high extraction is an effective method to reduce the pollution load during pulping and bleaching in the papermaking process.更多还原