活性染料高温厌氧生物降解研究

研究了升流式厌氧污泥床反应器(UASB)在高温条件下处理含盐活性红2(RR2)染料废水的工艺及RR2的降解机理.结果表明:运行温度为(55±1)℃，水力停留时间为12 h，进水ρ(NaCl)，ρ(COD_Cr)和ρ(RR2)分别为50　000，1　000和100 mg/L的条件下，以驯化好的厌氧颗粒污泥为接种污泥， 运行10 d后反应器达到稳定，COD_Cr和RR2去除率分别为25%和90%以上.利用气相色谱－质谱联用(GC-MS)分析厌氧出水发现， RR2的生物降解途径为在厌氧条件下最先被还原的是较易断裂的偶氮键(NN)，去除颜色后形成了芳香胺类化合物，一部分芳香胺类化合物通过水解和氧化作用进一步降解为更小分子的代谢物. 

Study on Thermophilic Anaerobic Biodegradation of Reactive Dye

The characteristics of anaerobic granules degrading saline dye wastewater were investigated in a laboratory-scale upflow anaerobic sludge blanket (UASB) reactor at (55±1) ℃. Experimental results demonstrate: when domestic anaerobic granular sludge was used as seed, the hydraulic retention time (HRT) was 12 h,influent NaCl mass concentration was 50 000 mg/L, influent COD_Cr was 1 000 mg/L, and Reactive Red 2 (RR2) dye concentration was 100 mg/L. The quasi-steady state of the UASB reactor was achieved after 10 running days. The COD_Cr and RR2 removal rates were above 25% and 90% respectively. GC-MS was used to inspect the degradation process of RR2. It was found that thermophilic salt-tolerant anaerobic granular sludge brought about the reductive cleavage of the azo linkage, which resulted in dye decolourisation and production of aromatic amines. Some of the aromatic amines degraded to small molecular metabolites through hydrolysis and oxidation.