活性艳蓝经多相类芬顿预处理前后对厌氧污泥性能的影响

发布时间：2019-06-13 20:24

【摘要】：以蒽醌类染料活性艳蓝为目标污染物,探讨了其对产甲烷菌的抑制机理;分析了其经多相类芬顿预处理前后对厌氧污泥EPS、粒径分布、金属离子含量的影响;同时对活性艳蓝的降解途径进行了探究。结果表明,活性艳蓝对产甲烷菌具有代谢毒性甚至生理性毒性;其进入厌氧反应器后,会造成COD去除率降低;颗粒污泥粒径减少,污泥中钙、镁离子浓度分别由40.5和16.2 mg·L~(-1)降低到22.5和6.8 mg·L~(-1),污泥的稳定性与絮凝性变差。而经多相类芬顿预处理后,COD去除率可达90%以上,厌氧颗粒污泥EPS总量、蛋白质含量、多糖含量分别增大到98.7、69.9和28.8 mg·(g VSS)~(-1),为保持颗粒污泥的活性与稳定性提供了保障。多相类芬顿体系所产生的羟基自由基首先攻击活性艳蓝的三嗪基团及不饱和共轭键的蒽醌结构,继而生成邻苯二甲酸、苯甲酸,再被降解为丁酸、草酸、乙酸等小分子羧酸,从而降低了其毒性,有利于后续厌氧生物处理的进行。
[Abstract]:Taking anthraquinones reactive brilliant blue as the target pollutant, the inhibitory mechanism of anthraquinone dye reactive brilliant blue on methanogenic bacteria was discussed, the effects of anthraquinone dye reactive brilliant blue on EPS, particle size distribution and metal ion content of anaerobic sludge before and after multiphase Fenton pretreatment were analyzed, and the degradation pathway of reactive brilliant blue was also discussed. The results showed that reactive brilliant blue had metabolic toxicity or even physiological toxicity to methanogenic bacteria; when it entered the anaerobics reactor, the COD removal rate decreased, the particle size of granular sludge decreased, the concentration of calcium and magnesium ions in sludge decreased from 40.5 mg 路L ~ (- 1) to 22.5 mg 路L ~ (- 1) and 6.8 mg 路L ~ (- 1), respectively, and the stability and flocculation of sludge became worse. After multiphase Fenton pretreatment, the removal rate of COD was more than 90%. The total EPS, protein content and polysaccharide content of anaerobic granulated sludge increased to 98.7, 69.9 and 28.8 mg (g VSS) ~ (- 1), respectively, which provided a guarantee for maintaining the activity and stability of granular sludge. The hydroxyl radical produced by the multiphase Fenton system first attacks the triazinyl group of reactive brilliant blue and the anthraquinone structure of the unsaturated conjugated bond, and then forms phthalic acid, benzoic acid, and then degrades to butyric acid, oxalic acid, acetic acid and other small molecular carboxylic acids, which reduces its toxicity and is beneficial to the subsequent anaerobic biological treatment.
【作者单位】：广西师范大学环境与资源学院;广西师范大学岩溶生态与环境变化研究广西高校重点实验室;哈尔滨工业大学市政环境工程学院;
【基金】：广西自然科学基金项目(2015GXNSFAA139267) 岩溶生态与环境变化研究广西高校重点实验室资助项目(YRHJ15Z006)~~
【分类号】：X703

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