removal of h2s and cod using uv, ferrate and uv/ferrate from municipal wastewater

Background: the aim of this study is to compare uv, ferrate (vi) and uv/ferrate (vi) methods for removal of hydrogen sulfide and chemical oxygen demand (cod) from municipal wastewater under a continuous condition. methods: the experiment was divided into three parts: 1) pollutants removal by using ferrate (vi) alone; 2) pollutants removal using uv alone; 3) pollutants removal using a combination of uv/ferrate (vi). the electrolysis process was utilized to generate ferrate (vi). results: the results showed that uv had the highest pollutants removal, so that 89% and 85% of hydrogen sulfide and cod were removed from the wastewater, respectively. uv/ferrate (vi) ranked as the next most efficient method. this method removed 65% and 73% of hydrogen sulfide and cod, respectively from the wastewater. conclusion: using ferrate (vi) alone had the lowest pollutant removal efficiency, with 41% and 48% of hydrogen sulfide and cod removal from wastewater, respectively. uv has a higher ability to remove hydrogen sulfide and cod from wastewater, compared with uv/ferrate (vi) and ferrate (vi) alone.