Research Of Food Purification Technique And Equipment Base On Hyroxyl Radical

With the improvement of life quality, people paid more attention to health and food quality, and required the food to be more safe. Food security issues caused by the residue of organic pollutants, such as pesticides and antibiotics were very serious at the present stage. People need some kinds of technique or equipment which could degrade organic pollutant to protect themselves from food security issues urgently. In this paper, we designed a new kind of food purification equipment which can generate hydroxyl radicals by electrochemical oxidation technology to degrade organic pollutant based on the dimensionally stable anode, sensor technology, embedded control technology, and the Internet of Things. The equipment has the ability to purify fruits, vegetables, fish, meat and other fresh food automatically. It could reach the purpose of sterilization, disinfection, and degrading the harmful organic pollutant residues, such as pesticides, colorant, antibiotics, hormones, and so on in food. Reducing the damage of food security issues to a certain extent. The result of malachite green degradation experiment showed that the purification equipment has significant effectiveness on the degradation of organic pollutant, and better than ozone and ultrasonic technology. This paper includes the following aspects:1. Researched the food purification methods. Analyzed the common physical and chemical food purification methods, and researched the technique that could generate hydroxyl radicals, as well as the factors affecting the productivity of hydroxyl radicals on the electrochemical oxidation reaction. Put forward the food purification technique with the core of hydroxyl radicals generated by electrochemical oxidation.2. Designed the food purification equipment. Designed the structure of the purification equipment and determined the components of the equipment, including the stabilized voltage supply, micro air, touch switches, touch chip, electromagnetic relays, sensors and other components. Completed the overall framework of the equipment, achieved the basic purify function.3. Implemented the embedded automatic control. Combined with sensor technology and embedded control technology to obtain the parameters of water temperature and conductivity that affect the electrochemical oxidation reaction by sensors; obtaining parameters for different food from user input by touch buttons. Made the food purification equipment to get water quality parameters and user parameters, set the control the electrochemical oxidation voltage and time, and complete the purification automatically.4. Selected the electrochemical oxidation parameters. Research on the parameters such as the amount of electrodes, electrode interval, electrode voltage of the electrochemical oxidation reaction, and the reaction time those have impact on the generation of the hydroxyl radicals when the electrochemical oxidation reaction happens. Selected the appropriate parameters based on the experiment analysis and the actual application conditions. Completed the selection and optimization of the operating parameters for the purification equipment.5. Designed the interface for the Internet of Things. Added a wireless module to the equipment to make the equipment has the ability to connect to local area network or the Internet via WiFi that make the equipment has the ability to communicated with the server or mobile devices within the same network, making the food purification equipment to be an Internet of Things device, and making it could be monitor and control by the android mobile devices.