Fig. 7
From: Water reuse and growth inhibition mechanisms for cultivation of microalga Euglena gracilis
Removal of growth inhibitors. 3D-FEEM spectra of HA after: (a) activated carbon; (b) UV254/H2O2/O3-treatment. (c) UV254/H2O2-treatment; (d) Dry weight (DW) of E. gracilis after different treatments. The regions in these spectra are assigned to various substances found in DOM in Fig. 3b and its caption. HA represents humic acid. Asterisk represents p < 0.05. The values represent mean ± SD, where n = 3