Capacitive desalination (CDI) for seawater desalination Name: ZhangLiwen School: School of chemical engineering and technology Number: 2012207148
Jan 11, 2016
Capacitive desalination (CDI) for seawater
desalination
Name: ZhangLiwen
School: School of chemical engineering and technology
Number: 2012207148
Introduction of capacitive desalination4.
Situation of water resources1.
Solutions to the problem2.
Introduction of seawater desalination3.
Content
Conclusion5.
The development of society
Situation of water resources
Population growth
Pipeline discharging sewageTrash Truck Disposing of Garbage
Situation of water resources
Highly Polluted River
Situation of water resources
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
Solutions
Saving water Seawater
desalination
Reducing water pollution
Solutions to the problem
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
Don’t let our tears become the last drop of water on earth
Solutions to the problem
Saving water, begins from myself.
DefinitionDefinition
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
Desalination
ThermalThermal
MembraneMembrane
CapacitanceCapacitance
Saltwater is heated, evaporated and collected .
Saltwater is forced through membrane sheets at high pressures
Introduction of seawater desalination
Advantage Principle
Introduction of CDI
AdvantageAdvantage
Energy-efficient
No pressure and heating
Environment-friendly
No chemical reagents
Introduction of CDI
CDI reactors comprise pairs of porous activated carbon electrodes through which the brine flows.
CDI reactors comprise pairs of porous activated carbon electrodes through which the brine flows.
Introduction of CDI
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
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
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