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WASTE MANAGEMENT USING SUPER CRITICAL WATER OXIDATION
Introduction
Super Critical Water(SCW)? When water’s temperature and pressure are above 3740C and 221 bar respectively, it enters a supercritical condition.
Its an additional phase to its more familiar solid, liquid and gaseous phases. Under these conditions the physical properties of water change.
Water phase Transition state
Super Critical State
Properties Of Super Critical Water
Density is less than that of the liquid;
Viscosity is the same as the gas;
Diffusivity is between the liquid and the gas.
Supercritical Water Oxidation (SCWO)?
SCWO takes advantage of the unique properties of SCW to destroy organic waste.
The organic content of the waste feed is quickly and efficiently converted to carbon dioxide, water , etc.
Process Flow Of A SCOW System:
AquaCritox:
Unique method in sustainable wastewater treatment and sludge destruction.
Uses SCWO, which destroys organic waste safely, without generating hazardous emissions.
Process:
SCW as the reaction medium, and an oxidant such as air, O2, or NO3.
High temperature and pressure.
Organic wastes and metals are oxidized to inert species.
Oxidized to CO2 and H2O along with a release of energy.
Process:
Some Facts Of Process:
Rapid & complete reaction.
Total conversion of organics to CO2, H2O, N2
Halogens converted to the corresponding mineral acids
No harmful by-products
No exhaust gas cleaning requirements
Continuous operation
Recycling of valuable in organics possible
Totally enclosed process
Some Facts Of Process:
Application of SCWO
The alterative for safe disposal is limited.
Deep well injection, open burning are restricted in many areas.
Many process are costly. SCWO represents an economic
alternative.
Super Critical Water
Surface Treatme
nt
Waste Treatme
nt
Recycling
Separation Of
Process
Application Of SCWO
Applications Of SCWO:
Hazardous & toxic harmless products.
Advantages of SCWO
Combustion efficiency is greater than 99.99 percent.
Excellent process stability and control.
Advantages of SCWO
Very high destruction efficiencies Totally contained process No smokestack Relatively low temperature operation Compact size Competitive cost Combustion efficiency is greater than
99.99 percent. Excellent process stability and control.
Demonstration and development
General atomics is the world leader in SCWO development.
They have 15 years of experience. US air force has been sponsoring
SCWO development over 10 years.
Pilot plant built by General atomic to demonstrate conversion of organic waste streams into various forms of fuels and power.
Supercritical water pilot plant
General atomic now offers SCWO for a wide range of applications.
Systems are automated, fast and easily installed.
SCWO built at McAlester Army Ammunition Plant.
use in cleanup of waste streams associated with demilitarization of weapons.
To transition from hazardous waste disposal to hazardous waste conversion.
Current SCWO applications
Evaluation in the Japanese hazardous waste destruction market.
The Bluegrass chemical demilitarization plant will use SCWO to destroy hydrolysate.
Tooele Army Depot for destruction of energetics hydrolysate.
A SCWO system is planned for waste treatment in a facility in Alaska
Conclusion
Powerful technology for transformation of toxic organic waste in inert compounds.
Specially recommended for disposal of hazardous wastes.
Thank You
