不同共基质条件下上流式厌氧污泥床反应器中硝基酚的降解研究

用实验室规模的2个UASB反应器,分别研究了以葡萄糖和乙酸钠为共基质条件下3-硝基酚(3-NP)和2,6-二硝基酚（2,6-DNP）的降解效果.结果表明,对3-NP的降解,用葡萄糖作共基质的效果明显好于以乙酸钠为共基质;而对2,6-DNP的降解,乙酸钠作共基质效果更好.在含3-NP废水厌氧降解实验中,保持进水COD浓度为2 500 mg/Ｌ左右,HRT为26 h,以葡萄糖为共基质时,进水3-NP浓度可提高到254.6 mg/Ｌ,3-NP的去除率保持在99.0%以上;以乙酸钠为共基质时,保持HRT为30 h,3-NP浓度可提高到71.6 mg/Ｌ,3-NP去除率在90.0%以上.在含2,6-DNP废水厌氧降解实验中,保持进水COD浓度在2 500 mg/Ｌ左右,HRT为35 h,以葡萄糖为共基质时,2,6-DNP浓度可提高到170.0 mg/Ｌ,2,6-DNP的去除率保持在98.0%以上;以乙酸钠为共基质时,保持HRT为30 h,2,6-DNP最大浓度可提高到189.5 mg/Ｌ,2,6-DNP的去除率在99.2%以上.

Effects of different co-substrates on degradation of nitrophenols using upflow anaerobic sludge bed (UASB) reactors

The removal efficiencies of 3-nitrophenol (3-NP) and 2,6-dinitrophnol (2,6-DNP) were investigated in two lab-scale upflow anaerobic sludge bed (UASB) reactors using two different co-substrates. Initially, glucose was used as co-substrate and followed by sodium acetate. The results showed that glucose was found to be a better co-substrate for 3-NP degradation as compared to sodium acetate. While for the degradation of 2,6-dinitrophenol, sodium acetate was better. For the study of 3-NP degradation, input COD concentration was kept as 2500 mg/L and hydraulic retention time (HRT) was kept as 26 h with glucose as co-substrate. Maximum 3-NP concentration was 254.6mg/L and 3-NP removal efficiencies were always more than 99.0%. While HRT was 30h with sodium acetate as co-substrate, maximum 3-NP concentration was 71.6mg/L and over 90.0% 3-NP removal efficiencies could be obtained. For the study of 2,6-DNP degradation, HRT was 35h using the same input COD concentration as 3-NP degradation. The maximum 2,6-DNP concentration was 170.0mg/L and 2,6-DNP removal efficiencies were always more than 98.0% using glucose as co-substrate. While HRT was 30h with sodium acetate as co-substrate, maximum 2,6-DNP concentration was 189.5mg/L and over 99.2% 2,6-DNP removal efficiencies could be obtained.