竹材两段挤压浸渍化学机械法制浆废水污染特性比较

Comparison of Pollution Characteristics of Different Bamboo Chemi-mechanical Pulp Wastewater Using Two Stage Impregnation Pulping Process

关键词:  竹材  化机浆废水  污染特性  制浆得率  总有机碳

Key Words:bamboo  chemi-mechanical pulp wastewater  pollution characteristic  pulp yield  TOC correlation

摘要:本文探讨了不同化学浸渍NaOH总用量下，慈竹和毛竹的化学机械法制浆性能；研究并比较了废水和COD_Cr产生量，探讨了废水的pH值、COD污染负荷、BOD₅、总氮、总磷等关键参数对生化处理的影响；测定了废水固形物的灰分及灰分中主要金属离子的含量，分析了用碱量与制浆得率及废水污染负荷的关系，探讨了废水总有机碳与COD污染负荷的相关性。结果表明，相同浸渍用碱量下，慈竹化机浆强度性能明显高于毛竹化机浆。2种化机浆综合废水产生量6.20~7.73 m³/t，pH值均大于8.5，COD_Cr产生量178.88~410.44 kg/t，用碱量与制浆得率和废水COD_Cr污染负荷相关，废水总有机碳与COD_Cr相关。

Abstract:In this paper， the chemi-mechanical pulping properties of Neosinocalamus affinis and moso bamboo with different chemical impregnation alkali amounts were discussed. The amount of wastewater and COD_Cr pollution load were compared and studied. The effects of key parameters such as pH value， COD_Cr， BOD₅， total nitrogen （TN）， and total phosphorus （TP） on biochemical treatment were discussed. The ash content of wastewater solids and the contents of main metal ions in ash were measured. The relationship between alkali consumption and pulping yield and wastewater COD_Cr pollution load was analyzed， and the correlation between wastewater total organic carbon （TOC） and COD_Cr was studied. The results showed that the strength properties of Neosinocalamus affinis chemi-mechanical pulp were significantly higher than that of moso bamboo chemi-mechanical pulp with the same impregnation alkali amount. The amount of comprehensive wastewater from the two chemi-mechanical pulps was 6.20~7.73 m³/t， the pH values were both above 8.5， and the COD_Cr pollution load was 178.88~410.44 kg/t. The total alkali consumption amount was related to the pulp yield and wastewater COD_Cr pollution load， TOC of wastewater was correlated with COD_Cr.