Disinfection of secondary treated wastewater using under pressure dissolved oxygen, copper ions and hydrogen peroxide

Many studies have been conducted to increase the efficiency of hydrogen peroxide (HP) in
wastewater disinfection to make HP disinfection more cost-effective with respect to reduced
concentration and detention time. In this study, the effects of HP, copper ions (Cu2+), and 1 atm.
pressure-dissolved oxygen (termed O2 in this study) applied either alone or in a binary or ternary
combination to undisinfected secondary treated wastewater (STW) were assessed.
Undisinfected STW in contact (1 h) with various doses of HP (alone), Cu2+ (alone), HP/Cu2+
(binary) and HP/Cu2+ with O2 (ternary) showed a variable fecal coliforms (FC) removal pattern,
ranging from 0.03 to 3.8 logs inactivation. O2 had the highest synergistic effect when combined
with Cu2+ and HP. The use of 200 mg L-1 HP + 5 mg L-1 Cu2+ together with O2 caused a 0.65 log
inactivation of FC more than the binary combination (i.e., 200 mg L-1 HP + 5 mg L-1 Cu2+).