Siedlecka et al. (2005) also studied a series of phenol compounds present in wastewater. These compounds, as mentioned above, are widely used therefore are commonly found in wastewater derived from different industries such as petrochemical, food or resin manufactured.
Since common biological treatment for these kinds of compounds is not feasible, is important to develop new technologies to treat these recalcitrant molecules.
In this paper the authors studied the influence of chloride and sulfate anions on Fenton’s reaction of three representative phenol compounds: phenol, 2-chloro- and 2-nitrophenol.
The batch experiments were carried out with the phenol solution in …show more content…
In conclusion, the authors found that chloride and sulfate anions influenced in the degradation rates of phenol, 2-chloro- and 2-nitrophenol under Fenton reactions. However, the chloride anion has a higher affectation in these systems. In the case of 2-chlorophenol the degradation rates are slower because the presence of additional chloride radicals from the abstraction reactions as mentioned above.
Lastly, chlorides and sulfates influence the biodegradation of phenolic compounds in a different way: biodegradability of phenol is improved by chloride and for 2-nitrophenol and 2-chlorophenol by sulfates.
As it can be seen, the examples of Fenton and photo- Fenton process applications, agree and confirm the theory explanations of these processes. Based on this, the parameters can be identified and establish a range for optimal conditions of operation or identify the possible effects of the parameters in the process. For example, the application of Fenton process (for different kind of pollutants) confirms that the optimal pH is around 3, as was discussed in the review