If both the processes are compared, it can be concluded that both
have some advantages and disadvantages. The microbial process is
an environmental friendly process but the treatment must last for a
longer time to ensure the microorganisms adaptation. In the chemical
oxidation process, the reaction time is less; however it should
be studied under an acidic medium and by adding some oxidizing
agents. This is limited by investment and operating costs. Consequently,
the conditions should first be evaluated before deciding
on which process that will be used.
It can be concluded that the microbial process and CWPO process
are promising technologies which might be used to treat
aqueous solutions containing azo dyes with good performance. The
results would expedite the application of these methods to the
treatment of wastewaters of textile industry.