Decontamination of water by combined solar advanced oxidation processes and biotreatment - Solar Energy Sciences and Engineering Applications - page 390

Figure 12.4.1 Degradation of wastewater containing two biorecalcitrant compounds by solar photo-
Fenton: (a) TOC elimination and toxicity, and; (b) Biodegradability of several samples
from intermediate stages of the treatment DIM (I) and DTIM (II) Structures are also
shown.
capacity. This demonstration plant was erected in the grounds of a pharmaceutical
company in the south of Spain (see Figure 12.2.3). Using the same protocol described
in Section 12.4.1, and after performing photo-Fenton experiments, biodegradabil-
ity was monitored by Zahn-Wellens tests with the results presented in Figure 12.4.2.
Biodegradability was enhanced and the threshold was reached at TOC < 150 mg/L
(70% biodegradability in 7 days). A sample with an initial TOC of around 180 mg/L
was biodegradable, but after a longer period of around 15 days. This means that with