1. Student: Marlene Barrera Ventura Supervisor: Dolors Salvatierra
Universitat Rovira i Virgili
Kinetic study of organic
wastes degradation in
supercritical water
Student:
Marlene Barrera Ventura
Supervisor:
Dolors Salvatierra

2. Contents Problem description Theory about Supercritical
Kinetic study of organic wastes degradation in supercritical water
Contents
Problem description
Theory about Supercritical
Water Oxidation (SCWO)
Objective and Workplan
Test assembly
Research perspectives

3. Problem Plastic containers of phytosanitary products Agricultural
Kinetic study of organic wastes degradation in supercritical water
Problem
Plastic containers
of phytosanitary
products
Agricultural
activities
Recycling process
Plastics
Wastewaters
It is necessary...
Optimize the wastewater treatment processes

4. Theory Some wastewater treatment processes: Water
Kinetic study of organic wastes degradation in supercritical water
Theory
Some wastewater treatment processes:
Activated carbon treatments
Incineration
Wet oxidation
Supercritical water oxidation (SCWO)
The reactivity of the supercritical water
system is consequence of:
Its low viscosity
Its high diffusivity
The water has the behavior of
a polar dissolvent, then is able of
dissolve the oxygen and organic
compounds (single phase)
Critical point:
T=374C
P=221 atm
Water

5. Supercritical Water Oxidation
Kinetic study of organic wastes degradation in supercritical water
Supercritical Water Oxidation
Wastewaters
CO2
REACTOR + +
H2O +
Oxidant
Others
at supercritical conditions
short reaction times
Destruction efficiences > 99.99%

6. Objective and workplan
Kinetic study of organic wastes degradation in supercritical water
Objective and workplan
General Objective:
Kinetic study for the oxidation of organic model molecules in water under supercritical conditions in a batch system

7. To define kinetic models
Kinetic study of organic wastes degradation in supercritical water
Workplan
Bibliographic search about Supercritical Water Oxidation
DEA
To prepare the test assembly
To define kinetic models
To establish the detection method of the gas chromatograph
To analyse results
To do experiments with each model molecule

8. Things to do in order to reach the general objective:
Kinetic study of organic wastes degradation in supercritical water
Things to do in order to reach
the general objective:
To do experiments at
different temperatures
and reaction times
To analyse results
To define kinetic models

9. Test assembly T REACTOR Temperature control Security purge Exit of
Kinetic study of organic wastes degradation in supercritical water
Test assembly
Temperature
control
REACTOR T
Tank
Six way valve
Cold bath
Exit of
reaction
products
Security
purge
Pump N2

10. Test assembly Reaction System: Tank Exit of reaction products LOAD
Kinetic study of organic wastes degradation in supercritical water
Test assembly
Reaction System:
REACTOR
SIX WAY
VALVE
LOAD
INJECTION
ENTRANCE
10 cm
Tank
Exit of
reaction
products

11. Test assembly Gas chromatograph:
Kinetic study of organic wastes degradation in supercritical water
Test assembly
Gas chromatograph:

12. . . . . . Kinetic Study if reaction is first order at constant T t 1/T
Kinetic study of organic wastes degradation in supercritical water
Kinetic Study
if reaction is first order .
at constant T . .
-ln CA/CA0
ln k .
slope = k
slope = -E/R .
k=A*exp(-E/RT) t
1/T

13. Research perspectives
Kinetic study of organic wastes degradation in supercritical water
Research perspectives
Supercritical Water
Oxidation:
Bibliographic Search
To design and to construct the continuous system
To do experiments in the continuous system with the model molecules
To prepare the test assembly
DEA
To establish the detection method of the gas chromatograph
To define kinetic models
Comparison between batch process - continuous process
To do experiments with each model molecules
To do experiments and to define models with mixtures
To analyse results
Economic Evaluation

14. Thank you for your attention!!!
Kinetic study of organic wastes degradation in supercritical water
Thank you for
your attention!!!