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

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

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

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

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%

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

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

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

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

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

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

. . . . . 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

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

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