Application of waste iron in ferrate(VI) synthesis and phenol removal as confirmation of efficiency

Abstract

Ferrate (VI) is a strong oxidizing, coagulating and flocculating agent. Due to its characteristics, it is suitable for treatment of waters of different origins. In these processes, resulting is an environmentally friendly and non-toxic product, Fe(OH)3, which according to the results of this paper can be recycled and re-synthesized to ferrate(VI). This paper presents a method for the synthesis of ferrate salts by oxidation process from steel pickling wastewater containing FeCl2 and FeCl3 salts.
The method for synthesis involves the process of oxidation of ferrous and ferric ions by means of Ca(ClO)2 in solid state and in the presence of KOH in solid state. The recording of the x-ray diffractometer demonstrates a significant presence of K2FeO4, while analysis revealed a yield of 15%.
The application of ferrate synthesized from waste iron is shown in the process of treating waste water from the wood industry. The example given of this paper is treatment of samples of WW from the wood industry, from the thermal dryer and steam chamber, using the Jar procedure. The initial concentration of phenol in the sample from the thermal dryer was 27 mg/l and in the sample from the steam chamber 30 mg/l. This wastewater also has a high content of natural organic matter (COD of the sample from the thermal dryer was 3233.1 mgO2/l and COD of the sample from the steam chamber was 4692.1 mgO2/l). The efficiency of removal of phenol by ferrate(VI) was 74.85% and 72.67% for samples from the thermal dryer and the steam chamber, respectively.