Catalytic Ozonation of Phenolic Wastewater: Identification and Toxicity of Intermediates

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Abstract

A new strategy in catalytic ozonation removal method for degradation and detoxification of phenol from industrial wastewater was investigated. Magnetic carbon nanocomposite, as a novel catalyst, was synthesized and then used in the catalytic ozonation process (COP) and the effects of operational conditions such as initial pH, reaction time, and initial concentration of phenol on the degradation efficiency and the toxicity assay have been investigated. The results showed that the highest catalytic potential was achieved at optimal neutral pH and the removal efficiency of phenol and COD is 98.5% and 69.8%, respectively. First-order modeling demonstrated that the reactions were dependent on the initial concentration of phenol, with kinetic constants varying from 0.038 min-1 ([phenol]o = 1500 mg/L) to 1.273 min-1 ([phenol]o = 50 mg/L). Bioassay analysis showed that phenol was highly toxic to Daphnia magna (LC50 96 h = 5.6 mg/L). Comparison of toxicity units (TU) of row wastewater (36.01) and the treated effluent showed that TU value, after slightly increasing in the first steps of ozonation for construction of more toxic intermediates, severely reduced at the end of reaction (2.23). Thus, COP was able to effectively remove the toxicity of intermediates which were formed during the chemical oxidation of phenolic wastewaters.

Figures

  • Table 1: Experimental steps and conditions.
  • Table 2: Specifications of nano-Fe3O4 coated on activated carbon.
  • Figure 1: Effect of initial pH on removal efficiency of phenol. [Phenol]o: 100mg/L; catalyst concentration of 0.5 g/L; reaction time: 5min.
  • Figure 2: Effect of initial concentration of phenol on degradation efficiency in COP. Catalyst concentration of 2 g/L; initial pH of 8 : 0.
  • Figure 3: The degree of phenol degradation and COD removal in the COP, [phenol]o = 500mg/L; catalyst concentration of 2 g/L; initial pH of 8 : 0.
  • Figure 4: The change of LC 50 of treated phenolic stream versus reaction time of COP, [phenol]o = 200mg/L; catalyst concentration of 2 g/L; initial pH of 8 : 0.
  • Figure 5:The change of toxic unit of treated phenolic stream versus reaction time of COP, [phenol]o = 200mg/L; catalyst concentration of 2 g/L; initial pH of 8 : 0.
  • Table 3: Identified compounds by GC/MS.

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APA

Farzadkia, M., Dadban Shahamat, Y., Nasseri, S., Mahvi, A. H., Gholami, M., & Shahryari, A. (2014). Catalytic Ozonation of Phenolic Wastewater: Identification and Toxicity of Intermediates. Journal of Engineering (United Kingdom), 2014. https://doi.org/10.1155/2014/520929

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