Student:Marlene Barrera Ventura

Supervisor:Dolors Salvatierra

Universitat Rovira i Virgili

Kinetic study of organic

wastes degradation in

supercritical water

Contents

Kinetic study of organic wastes degradation in supercritical water

• Problem description• Theory about Supercritical

Water Oxidation (SCWO)• Objective and Workplan• Test assembly• Research perspectives

Problem

Wastewaters

Agriculturalactivities

Plastic containersof phytosanitary

products

Recycling process

Plastics

Optimize the wastewater treatment processes

It is necessary...

Kinetic study of organic wastes degradation in supercritical water

TheorySome wastewater treatment processes:

•Activated carbon treatments•Incineration•Wet oxidation•Supercritical water oxidation (SCWO)

WaterCritical point:T=374CP=221 atm

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)

Kinetic study of organic wastes degradation in supercritical water

Supercritical Water Oxidation

Wastewaters

Oxidant

+

at supercritical conditions

CO2

H2O+

+Others

REACTOR

Destruction efficiences > 99.99%

short reaction times

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

Kinetic study of organic wastes degradation in supercritical water

Workplan Kinetic study of organic wastes degradation in supercritical water

To establish the detection method of the

gas chromatograph

To do experiments with each model molecule

To analyse results

To define kinetic To define kinetic modelsmodels

Bibliographic search about Supercritical Water

Oxidation

To prepare the test assembly

DEA

To do experiments at different temperatures and reaction timesTo analyse resultsTo define kinetic models

Things to do in order to reach the general objective:

Kinetic study of organic wastes degradation in supercritical water

Kinetic study of organic wastes degradation in supercritical water

Test assemblyTemperature

control

REACTOR

T

Tank

Six way valve

Cold bath

Exit of reaction products

Security purge

Pump

N2

Reaction System:

Tank

Exit of reaction products

LOAD

INJECTION

ENTRANCE

SIX WAYVALVE

REACTOR

Test assemblyKinetic study of organic wastes degradation in supercritical water

10 cm

Test assembly

Gas chromatograph:

Kinetic study of organic wastes degradation in supercritical water

Kinetic Study-ln

CA/C

A0

1/T

. .

.

..........

k=A*exp(-E/RT)

if reaction is first order

Kinetic study of organic wastes degradation in supercritical water

.....

.....

t

at constant T

slope = k slope = -E/R

ln k

Research perspectives

To establish the detection method of the

gas chromatograph

To do experiments with each model molecules

To analyse results

To define To define kinetic modelskinetic models

To design and to construct the continuous

system

To do experiments and to define models with

mixtures

To do experiments in the continuous system with

the model moleculesDEADEA

Supercritical Water

Oxidation:

Bibliographic Search

To prepare the test assembly

Comparison between batch process -

continuous process

Economic Evaluation

Kinetic study of organic wastes degradation in supercritical water

Thank you for Thank you for

your attention!!!your attention!!!

Kinetic study of organic wastes degradation in supercritical water