Presentation Title

A Study of an Electrochemical Oxidation Reaction using MMO anodes

Faculty Mentor

Luis Cabrales

Start Date

17-11-2018 8:45 AM

End Date

17-11-2018 9:00 AM

Location

C162

Session

Oral 1

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Water scarcity is a prevalent issue in California due to one of the worst drought to hit the state in centuries. In addition, water supplies around the world are getting strained by the consumption of an increasing population and an increase in industrial use. One way to combat this issue is by treating wastewater and reusing it for alternative purposes, such as agricultural irrigation or industrial reuse. Among many different technologies to remove organic contaminants from water, one of them is based on the principle of electrochemical oxidation. Electrochemical reactors have the advantage that the required oxidants are generated in situ by passing an electrical current through the electrodes. In this project, a mix metal oxides (MMO) anode is used to generate reactive species in the water. The reactor is configured by using a concentric anode/cathode tubes. The purpose of this project is to examine the efficiency of an electrochemical oxidation reactor by using a well-known organic molecule, in this case methylene blue. The concentration of methylene blue is monitored by UVVIS spectroscopy as a function of reaction time. In the first part, different currents were used, 5, 10, 15, 20 and 25 amps, while keeping all other variables constant. In the second part of this study, the current was maintained constant, while the initial pH of the solution was varied between 5 and 12. The last experiment consisted of varying the concentrations of methylene blue. These concentrations were 0.003, 0.006, 0.009, and 0.012 g/L. In all the experiments, a sample was taken every 30 seconds and the absorbance was measured. Through these experiments, the kinetic of the oxidation of methylene blue was successfully evaluated. Therefore, the electrochemical reactor using MMO anodes has proven that it can effectively remove organic material from water in an effective manner.

Summary of research results to be presented

With the 70 experiments conducted there is sufficient evidence to present which indicates that the electrochemical reactor using MMO anodes was successful at removing organic molecules, methylene blue, from water. Trial runs determined a 10-minute residence time, which was more than enough time to successfully reduce the menthylene blue concentration. In each experiment the data demonstrated a decrease in absorbance within the methylene blue solution. The sample solutions of methylene blue were compared to the absorbance of deionized water. This comparison led to the conclusion that the methylene blue was able to reach the same absorbance as deionized water. It was also discovered that even though MMO’s decreased the absorbance within the water it would increase the pH of water. This increase happened within the first 30 seconds of the unit being turned on but remained constant within a pH range of 9 and 10. The conductivity of the solution was also tested but there was only a slight measurable increases in this area. By understanding how MMO’s work within a known organic compound it will make future research in wastewater separation easier to comprehend.

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Nov 17th, 8:45 AM Nov 17th, 9:00 AM

A Study of an Electrochemical Oxidation Reaction using MMO anodes

C162

Water scarcity is a prevalent issue in California due to one of the worst drought to hit the state in centuries. In addition, water supplies around the world are getting strained by the consumption of an increasing population and an increase in industrial use. One way to combat this issue is by treating wastewater and reusing it for alternative purposes, such as agricultural irrigation or industrial reuse. Among many different technologies to remove organic contaminants from water, one of them is based on the principle of electrochemical oxidation. Electrochemical reactors have the advantage that the required oxidants are generated in situ by passing an electrical current through the electrodes. In this project, a mix metal oxides (MMO) anode is used to generate reactive species in the water. The reactor is configured by using a concentric anode/cathode tubes. The purpose of this project is to examine the efficiency of an electrochemical oxidation reactor by using a well-known organic molecule, in this case methylene blue. The concentration of methylene blue is monitored by UVVIS spectroscopy as a function of reaction time. In the first part, different currents were used, 5, 10, 15, 20 and 25 amps, while keeping all other variables constant. In the second part of this study, the current was maintained constant, while the initial pH of the solution was varied between 5 and 12. The last experiment consisted of varying the concentrations of methylene blue. These concentrations were 0.003, 0.006, 0.009, and 0.012 g/L. In all the experiments, a sample was taken every 30 seconds and the absorbance was measured. Through these experiments, the kinetic of the oxidation of methylene blue was successfully evaluated. Therefore, the electrochemical reactor using MMO anodes has proven that it can effectively remove organic material from water in an effective manner.