capacitive desalination (cdi) fo r seawater desalination

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