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

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Pages :
121 - 130

Nabizadeh R., Alimohammadi M., Nemati R., Naddafi K., Naseri S., Aslani H. and Mousavipour S.N.
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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+).

Fecal coliforms, Synergistic effect, Wastewater reuse