上流式厌氧污泥床反应器处理3-硝基酚废水研究

Study on 3-Nitrophenol Wastewater Treatment in UASB

利用实验室规模的UASB反应器,研究了颗粒污泥驯化前后的特性,3-硝基酚(3-NP)的降解效果和UASB处理3-NP废水的工艺参数.结果表明,驯化过程中颗粒污泥很快适应3-NP废水;扫描电镜观察显示,颗粒污泥表面丝状菌占优势.在3-NP废水厌氧降解性实验中,保持HRT和进水COD浓度不变,分别为26 h和2 500 mg/L左右,当3-NP浓度由20 mg/L逐渐提高到250 mg/L时,COD去除率由95.2%下降到85.1%;3-NP的去除率保持在99%以上;3-AP是3-NP降解过程中的主要中间产物,3-NP转化为3-AP的转化率由58.7%上升到111.9%;产气量变化较小,甲烷占总产气量百分数最小为65%,最大为74%.

Characteristies of anaerobic granules before and after acclimation, removal efficiencies of 3-nitrophenol （3-NP） and performance of 3-NP wastewater treatment were investigated in a lab-scale upflow anaerobic sludge bed （UASB）. The results showed that granular sludge acclimatized to 3-NP rapidly during acclimation. Using SEM, the filamentous bacteria was the predominant bacteria on the surface of granules. Throughout the study of 3-NP wastewater anaerobic degradation, hydraulic retention time （HRT） and input COD concentration were kept constant as 26 h and 2 500 mg/L, respectively. While 3-NP concentrations increasing from 20 mg/L to 250 mg/L gradually, COD removal decreased from 95.2 % to 85.1% and 3-NP removal efficiencies were always more than 99%. 3-AP was found to be the major intermediate during the degradation of 3-NP. Out of the total input of 3-NP concentration, on molar basis, about 58.7% -- 111.9% of 3-NP was recovered in the form of 3-AP. With increasing 3-NP concentration, the variations of gas production were minimal. The minimum methane percentage was 65% and the maximum was 74%.