甘蔗渣作为广西制糖产业的主要副产物，是广西最有前景的非木材纤维造纸原料。蔗渣浆ECF漂白废水中有毒有害、难降解的可吸收有机卤化物(AOX)的高效降解是亟待解决的问题。光催化氧化-生物降解直接耦合技术(ICPB)为AOX高效降解提供新思路，高效负载可见光催化剂和生物膜的载体是影响ICPB作用效果的关键因素，优化体系光催化效应和微生物活性的协同作用机制及AOX降解机理和路径是尚需认知的关键科学问题。本研究以环境友好、生物相容的蔗渣纤维素高效负载可见光响应的纳米TiO2与微生物，构建ICPB体系。以2,4,6三氯苯酚、1,2,4-三氯苯作为AOX目标污染物，通过调控关键影响因素优化体系，揭示光催化-生物降解协同作用机制。最后通过生物响应分析、追踪AOX及中间产物结构和组分变化规律，推断AOX降解机理和路径。本研究为广西蔗渣浆ECF漂白废水中的AOX高效降解提供理论依据和新的实践方法。

As the main by-product of sugar industry in Guangxi, bagasse is the most promising non-wood fiber material for papermaking in Guangxi. With the improvement of the standard for AOX emission, the efficient removal of toxic and refractory organic compounds of AOX in the elemental chlorine free (ECF) bleaching wastewater is an urgent problem to be solved. Intimate coupling of photocatalysis and biodegradation (ICPB) technology provides a new way for AOX efficient degradation. The highly efficient carrier of visible-light photocatalyst and biofilm is the key factor affecting the effect of ICPB. The optimization of photocatalyst performance and microbial activity synergy mechanism of ICPB system, and the degradation mechanism of AOX are the key scientific issues to be recognized. In this research, ICPB is built by visible-light-responsive nano-TiO2 and microorganism which is effective loaded on the environment-friendly and biocompatible bagasse cellulose carrier. Then, 2,4,6-trichlorophenol and 1,2,4-trichlorobenzene are used as the target pollutants of AOX, the ICPB system is optimized by the key factors. The synergy mechanism of ICPB system is revealed. Finally, the degradation mechanism of AOX are deduced by biological response analysis, tracing the structure and composition of AOX and intermediate products. This study provides a theoretical basis and a new practical method for the efficient degradation of AOX in ECF bleaching wastewater in Guangxi.