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. 2014 Jan 23:2014:173010.
doi: 10.1155/2014/173010. eCollection 2014.

Removal of the 2-mercaptobenotiazole from model wastewater by ozonation

Jan Derco  1 , Angelika Kassai  2 , Michal Melicher  1 , Jozef Dudas  1
Affiliations

Removal of the 2-mercaptobenotiazole from model wastewater by ozonation

Jan Derco et al. ScientificWorldJournal. .

Abstract

The feasibility of ozonation process for 2-mercaptobenzothiazole (2-MBT) removal follows from results of ozonation of the model wastewater. Total removal of 2-MBT was observed after 20 minutes of ozonation. Very good reproducibility of repeated ozonation trials including sampling and analysis was observed. However, the majority of dissolved organic carbon (DOC) and chemical oxygen demand (COD) remained in the reaction mixture. Benzothiazole (BT) and 2-hydroxybenzothiazole (OBT) intermediates were identified during degradation of 2-MBT with ozone. In addition to the above benzothiazole derivatives, the creation of some other organic compounds follows from results of mass balance. The best fits of experimental data were obtained using the first kinetic model for 2-MBT and zero-order kinetic model for COD and DOC. The reaction time of 60 minutes can be considered as effective with regard to controlled oxidation in order to increase a portion of partially oxidized substances. Higher biodegradability and lower toxicity of ozonation products on respiration activity of activated sludge microorganisms was observed at higher ozonation time.

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Figures

Figure 1
Figure 1
Schematic diagram of experimental apparatus. 1: ozonation column, 2: destruction of residual ozone, 3: oxygen supply, 4: ozone generator, 5: mixture of oxygen and ozone, 6: ozone distribution, 7: sampling, 8: residual gas outlet, 9: separation of moisture, 10: glass fiber filter, 11: UV analyzer of ozone content in gas phase.
Figure 2
Figure 2
Dependencies of measured (◆) and calculated (—) 2-MBT values on ozonation time.
Figure 3
Figure 3
Dependencies of measured (◆) and calculated (—) DOC values on ozonation time.
Figure 4
Figure 4
Dependencies of measured (◆) and calculated (—) COD values on ozonation time.
Figure 5
Figure 5
Dependence of concentrations (●) 2-MBT, (◆) BT, and (■) OBT on ozonation time.
Figure 6
Figure 6
Dependencies of COD portions on ozonation time. (●) αCODoxi, (▲) αCODmin⁡, (◆) αCODparcoxi, and (■) μCODpartoxi.
Figure 7
Figure 7
Dependencies of ΔO3/ΔCOD (■) and MOC (▲) values on ozonation time.
Figure 8
Figure 8
Time dependencies of O3 concentration in the gaseous phase. — Input, ● Output 2-MBT, and ■ Output H2O.
Figure 9
Figure 9
Dependencies of SOUR with the activated sludge microorganisms on COD values during respirometric measurements performed with ozonized model wastewater containing 2-MBT during 15 minutes (●) experimental, (- - -) calculated and during 40 minutes (■) experimental, (—) calculated.
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