电化学氧化与生物法联合降解木质素的影响因素  

Influencing factors of lignin degradation by combination of electrochemical oxidation and biodegradation

作　　者：崔晓敏[1] 梁继东[1] 霍欣[1] 王述梁 

机构地区：[1]西安交通大学能源与动力工程学院环境科学与工程系,西安710049 [2]北京中科联合环境科技有限公司,北京100870

出　　处：《环境工程学报》2016年第5期2407-2412,共6页Chinese Journal of Environmental Engineering

基　　金：陕西省科技统筹创新工程项目(2011KTZB03-03-01);陕西省自然科学基金资助项目(2015JQ2052)

摘　　要：采用高效的电化学氧化技术联合低成本的生物降解技术,进行了木质素的降解探索。考察了电流密度、电量、初始p H和电解质浓度对木质素降解效果的影响,结果表明,电流密度和电量影响显著,而初始p H和电解质浓度的影响较小。经过综合比较,得到电化学与生物联合降解木质素的最佳反应条件为:电流密度为5.0 m A/cm2;电量为20 k C;初始p H为7;电解质浓度为0.1 mol/L。在此条件下,碱木质素和木质素磺酸钠的COD去除率分别达到65.97%和59.31%,表征木质素酚羟基结构的UV280分别降低了65.97%和59.77%,色度去除率分别为74.15%和58.32%。总之,电化学前处理可破坏木质素的关键结构,提高木质素的可生化性,从而促进加快后续生物降解。Lignin degradation by combining electrochemical oxidation（ EO） with biodegradation（ BD） was studied. The effects of four factors such as current density,electronic quantity,p H value,and concentration of the supporting electrolyte on lignin degradation were analyzed. The results showed that current density and electronic quantity had much more important impacts on lignin degradation than the p H value and concentration of the supporting electrolyte. Through comparison,the optimum conditions for ligning degradation were confirmed ascurrent intensity of 5. 0 m A / cm2,electric quantity of 20 k C,p H of 7,and concentration of supporting electrolyte of 0. 1 mol / L. For kraft lignin and lignosulfonate degradation,COD removal rates of 65. 97% and 59. 31%,UV280 reduction of 65. 97% and 59. 77%,and color removal efficiencies of 74. 15% and 58. 32% were obtained. It was confirmed that EO could destroy the recalcitrant bonding structure of lignin to produce biodegradable intermediates that could be removed easily by further bioprocesses.

关 键 词：电化学氧化 好氧生物降解 木质素 联合降解 

分 类 号：X592[环境科学与工程—环境工程]