纤维浆料过程流木质素源污染转移及其控制节点的研究

Applicant, during the long-term practice and study, found that the lignin source pollution trasfer theory of fiber pulp process flows has not been recognized for a long time, which causes that the way of biomass pulping pollution control was distorted, and the effects of pollution control and treatment were quite poor. The project put forward studying the structure and mass change of source pollutants-the liquid phase lignin and solid phase lignin during transfer in the fiber pulp process flows, then exploring the effect of lignin source pollution transfers in the fiber pulp process flows on COD, BOD, BOD/COD, AOX and its toxicity, as well as the AOX forming mechanism, establishing the relationships among the liquid phase and solid phase lignin source pollution transfers, COD, BOD, BOD/COD, AOX and its toxicity, finding the control nodes of source pollution from the liquid phase lignin and solid phase lignin of the fiber pulp process flows, understanding the key factors of lignin source pollution. And the control measures of lignin source pollution are proposed and evaluated. The right direction and best way of pollution control for the biamass pulping process will be found to fall overall pollution sharply, and treat the pulping wastewater more easily. This original research has a great scientific significance and universal practical value on the establishment of the lignin source pollution theory of fiber pulp process flow, and on recognition and relocation of pulping pollution and its control.

申请者在长期的研究和实践中发现，纤维浆料过程流木质素源污染转移理论和实践价值一直不被人们认知，导致生物质制浆过程污染控制方向与方法被严重扭曲。项目提出，研究纤维浆料过程流源污染物质液相和固相纤维木质素转移的结构特征和质量变化，探讨木质素源污染转移对COD、BOD、BOD/COD、AOX及其毒性的贡献、AOX的形成及其转移机理，建立液相和固相木质素源污染转移与COD、BOD、BOD/COD、AOX及其毒性的关系规律，找到液相和固相木质素源污染转移的控制节点，明确木质素源污染的关键过程因素，提出和评价木质素源污染转移的控制措施，为生物质制浆过程污染控制找到正确方向和最佳途径，实现生物质制浆过程总体污染大幅下降，废水易达标处理排放。研究对纤维浆料过程流木质素源污染转移理论的建立，对重新认识和正确定位生物质制浆过程污染的产生和控制具有重要的科学意义和普遍的现实价值，属原创性研究。

纤维浆料过程流木质素源污染转移理论和实践价值一直不被人们认知，导致生物质制浆过程污染控制方向与方法被严重扭曲。项目研究纤维浆料过程流源污染物质黑液液相和纤维固相木质素转移的结构特征和质量变化，探讨木质素转移对COD，BOD和AOX的贡献及其关系规律，木质素转移的AOX形成机理及其毒性效果，提出木质素源污染转移COD、BOD和AOX的控制节点，为纤维浆料过程流木质素源污染转移数据的发掘、木质素源污染转移预测和评价、生物质制浆过程流程工业环境评价由后端评价向前端转移、推动污染控制清洁生产提供理论和实践方案。研究对重新认识和正确定位生物质制浆过程污染的产生、转移和和控制具有重要的科学意义，对流程工业前端流程环节环境评价具有普遍的应用价值，属原创性研究。. 研发最重大的发现和证实：黑液提取浓度决定黑液提取率，黑液提取率是液相木质素转移的关键控制节点，黑液液相木质素转移是过程产生污染负荷的决定因素，其对污染负荷指标的影响和贡献远远大于固相木质素转移，液相木质素转移消耗大量的漂白有效成分，大幅度降低漂白效果，给漂后废水引入大量的难生物降解的污染负荷。分子量介于1000-2000中性疏水性液相木质素是构成AOX毒性的主要来源。研究还发现理论COD与实测CODCr的差别，提出一定条件下理论COD的可应用性性和快速性。研究漂白前后木质素理论COD和CODCr的变化证实，木质素是一种难于化学和生化降解的源污染物质。