tailieunhanh - Waste Water Treatment and Reutilization Part 9

Tham khảo tài liệu 'waste water treatment and reutilization part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Degradation of Nitroaromatic Compounds by Homogeneous AOPs 229 Fig. 6. Linear relationships among functions of zNBEslow and different parameters kF. 2. Fe2 ss. H2O2 1 1 Fe LJss L 2 2J L Sow Unb. . NBE kn2O2. H2O2 50 Given that kFe 3 k Fe 2 during the slow phase the Fe2 concentration is negligible and Fe3 slow Fe3 0. By combining the rate equations for NBE and H2O2 with eqns 49 and 50 the following expressions for the slow phase can be obtained Nichela et al. 2008 rNBE rSlow k1. Fe3 . H2O2 kNBE . NBE __ kNBE NBE kHP H2O2 51 rHP rSlow ki. Fe3 . H2O2 . b kNBE kHP . H2 O2 __ NBE kHP H2 O2 52 It is worth to mention that eqns 51 and 52 are in excellent agreement with the experimental trends as it is observed in Fig. 6. Semi quantitative analysis of the autocatalytic profiles We also used Fenton-like process for the oxidation of a series of structurally related substrates in order to test the autocatalytic nature of these systems Nichela et al. 2010 . The model compounds were 2-hydroxybenzoic 2HBA 2 4-dihydroxybenzoic 24DHBA 2-hydroxy-5-nitrobenzoic 2H5NBA 4- hydroxy-3-nitrobenzoic 4H3NBA and 2- hydroxy-4-nitrobenzoic 2H4NBA acids. The normalized profiles of S and H2O2 are shown in Fig. 7. The kinetic behavior is strongly dependent on the nature of the substrate and excepting 4H3NBA the substrates clearly display autocatalytic decays the profiles being like inverted S-shaped curves. The quantitative description of this kinetic traces is rather complicated and to the best of our knowledge no simple equation has been proposed to model 230 Waste Water - Treatment and Reutilization Time min Fig. 7. Normalized concentration profiles of model substrates obtained in dark Fenton-like process. concentration profiles of this kind that are frequently found in degradation studies of environmental relevance. For the quantitative comparison of the kinetic curves we proposed an empirical equation for fitting the normalized decay profiles Nichela et al. 2010

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