Kuscu Ozlem Selcuk, Sponza Delia Teresa
Department of Environmental Engineering, Engineering and Architecture Faculty, Süleyman Demirel University, Isparta, Turkey.
Bioresour Technol. 2009 Apr;100(7):2162-70. doi: 10.1016/j.biortech.2008.10.049. Epub 2008 Dec 6.
The effects of increasing nitrobenzene (NB) concentrations and hydraulic retention times (HRT) on the treatment of NB were investigated in a sequential anaerobic baffled reactor (ABR)/aerobic completely stirred tank reactor (CSTR) system. In the first step of the study, the maximum COD removal efficiencies were found as 88% and 92% at NB concentrations varying between 30 mg L(-1) and 210 mg L(-1) in ABR. The minimum COD removal efficiency was 79% at a NB concentration of 700 mg L(-1). The removal efficiency of NB was nearly 100% for all NB concentrations in the ABR reactor. The methane gas production and the methane gas percentage remained stable (1500 mL day(-1) and 48-50%, respectively) as the NB concentration was increased from 30 to 210 mg L(-1). In the second step of the study it was found that as the HRT decreased from 10.38 days to 2.5 days the COD removal efficiencies decreased slightly from 94% to 92% in the ABR. For maximum COD and NB removal efficiencies the optimum HRT was found as 2.5 days in the ABR. The total COD removal efficiency was 95% in sequential anaerobic (ABR)/aerobic (CSTR) reactor system at a minimum HRT of 1 day. When the HRT was decreased from 10.38 days to 1 day, the methane percentage decreased from 42% to 29% in an ABR reactor treating 100 mg L(-1) NB. Nitrobenzene was reduced to aniline under anaerobic conditions while aniline was mineralized to catechol with meta cleavage under aerobic conditions.
在序批式厌氧折流板反应器（ABR）/好氧完全搅拌釜式反应器（CSTR）系统中，研究了增加硝基苯（NB）浓度和水力停留时间（HRT）对NB处理效果的影响。在研究的第一步中，在ABR中NB浓度在30 mg L⁻¹至210 mg L⁻¹之间变化时，最大化学需氧量（COD）去除效率分别为88%和92%。在NB浓度为700 mg L⁻¹时，最小COD去除效率为79%。在ABR反应器中，所有NB浓度下的NB去除效率几乎均为100%。随着NB浓度从30 mg L⁻¹增加到210 mg L⁻¹，甲烷气体产量和甲烷气体百分比保持稳定（分别为1500 mL/天和48 - 50%）。在研究的第二步中发现，随着HRT从10.38天降至2.5天，ABR中的COD去除效率从94%略微降至92%。对于最大COD和NB去除效率，在ABR中发现最佳HRT为2.5天。在序批式厌氧（ABR）/好氧（CSTR）反应器系统中，最小HRT为1天时，总COD去除效率为95%。当HRT从10.38天降至1天时，在处理100 mg L⁻¹ NB的ABR反应器中，甲烷百分比从42%降至29%。在厌氧条件下硝基苯被还原为苯胺，而在好氧条件下苯胺通过间位裂解被矿化为儿茶酚。
