1. Capacitive desalination (CDI) for seawater desalination Name: ZhangLiwen School: School of chemical engineering and technology Number: 2012207148

2. Introduction of capacitive desalination 4. Situation of water resources 1. Solutions to the problem 2. Introduction of seawater desalination 3. Content Conclusion 5.

3. The development of society Situation of water resources Population growth

4. Pipeline discharging sewage Trash Truck Disposing of Garbage Situation of water resources

5. Highly Polluted River Situation of water resources

6. According to statistics, only 50% of people living in Central Africa can access safe water. The largest population without access to safe tap water is in China (25%) Situation of water resources

7. Solutions Saving water Seawater desalination Reducing water pollution Solutions to the problem

8. FinallySecondFirst Cleaning up polluted water Not throwing trash or garbage into any stream or lake. Protecting ourselves against polluted water. What can we do about the water pollution ? Solutions to the problem

9. Don’t let our tears become the last drop of water on earth Solutions to the problem Saving water, begins from myself.

10. Definition Desalination is the process of removing salt and minerals from salt water to make it suitable for human consumption, irrigation and other fresh water uses. Introduction of seawater desalination

11. Desalination Thermal Membrane Capacitance Saltwater is heated, evaporated and collected. Saltwater is forced through membrane sheets at high pressures Introduction of seawater desalination

12. AdvantagePrinciple Introduction of CDI

13. Advantage Energy-efficient No pressure and heating Environment- friendly No chemical reagents Introduction of CDI

14. CDI reactors comprise pairs of porous activated carbon electrodes through which the brine flows. Introduction of CDI

15. Adsorption stage The cations in the aqueous solution are adsorbed on the cathode and the anions are adsorbed on the anode, leaving a deionized solution in the cell, which flows out as freash water. Introduction of CDI Adsorption Desorption

16. Desorption stage The electrodes are shorted, leading to ion desorption, thus forming concentrated solutions that are expelled from the cell as waste. Desorption Introduction of CDI

17. Everyone has the accountability to save water and to propagate the concept of treasuring water. CDI is regarded as a promising desalination process. Desalination is useful in solving the problem of water shortage. Conclusion