Environmental Engineering Reference
In-Depth Information
Figure 12.3.3 Photo-Fenton degradation of an industrial wastewater: (a) AOS during treatment, and;
(b) Z-W biodegradability analyses of selected samples.
oxidation process, more oxidized organic intermediates are formed at the beginning
(Note how fast COD drops until H 2 O 2 is 10 mM) without any substantial miner-
alization (very low, as measured by TOC, until H 2 O 2 is 10 mM). After a certain
amount of H 2 O 2 has been consumed, COD and TOC behave similarly, stabilizing
the AOS. After 25 mM of H 2 O 2 , another increase in AOS, though not as sharp, and
another steady state after 35 mM of H 2 O 2 were observed, indicating that the very
different intermediates formed go through different oxidation-mineralization steps.
Formation of more oxidized intermediates is usually an indirect demonstration of
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