ESCO International UK – July 2015

The aim of this study was to investigate the use of ozone-based advanced oxidation processes for the oxidative destruction of COD in a petrochemical facility.

Several  AOP experiments were carried out in order to select and optimise the successful treatment option.

A LABO3-AOP pilot unit was used where filtered waste water (COD 1250 ppm) was circulated throughout the AOP reactor and ozone & H2O2 injected at various dose rates using Venturi-type  injectors. Treated samples were withdrawn from the test unit for COD analysis.  The amount of ozone and H2O2 used in the COD oxidative degradation process were also monitored.

Results analysis:

The graph below shows the COD reduction trend based on laboratory test results.

The results indicate that by simply increasing the ozone & H2O2 dose rates and reaction time, we can easily achieve less than 100 ppm COD as requested by the customer. Extended tests show that COD of less than 60 ppm can be achieved.

Conclusions:

Test results indicate that , under laboratorty testing & analytical conditions, the ozonation process can successully  oxidize  COD . Additional tests using a combination of ozone and H2O2, shows that COD can be further reduced to meet lower COD targets of less than 60 ppm. These laboratory experiment confirm that, under certain operating conditions, O3/H2O2 process is the most suitable solution for the oxidative degradation of COD .

As a result, the petrochemical facility selected ESCO International for the submission of a full scale O3/H2O2 treatment solution design.

This project demonstrates once more, ESCO International’s technical capabilities in providing advanced water treatment solutions to meet specific customer needs.

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