Investigation of H2O2/UV advanced oxidation process on the removal rate of coliforms from the industrial effluent: A pilot-scale study.

Wastewater recycling and reuse is very important, specially in countries with water shortage problem. Disinfection is very crucial step of wastewater treatment, particulary from the reuse and environmental protection point of view. In this research, the efficiency of the advanced oxidation process using UV and H 2 O 2 combination was investigated on fecal coliform (FC) inactivation from a real industrial effluent; furthermore, the optimal condition for disinfection of the effluent using various parameters such as pH, H 2 O 2 concentration, and contact time was determined. Based on the acquired outcomes, by pH decline from 11 to 7 and 3 inactivation rate increased (6.7% and 20.9%, sequentially), indicating the efficacy of acidic condition on the process. Increasing H 2 O 2 concentration from 5 mg/L to 15 mg/L, 25 mg/L, and 35 mg/L, was led to increase FC inactivation by 16.6%, 29.75%, and 36.33%, respectively. Considering contcat time impact on the process performance, our findings revealed that the best efficiency obtained after 40 (s) contact time. It can be concluded that the combined UV/H 2 O 2 is more potent than single UV and H 2 O 2 process, making it possible to reach irrigation standards. [Display omitted] • Novel laboratory setup built to measure the fecal coliform removal rate of effluent. • Effect of pH, H 2 O 2 concentration, retention time on fecal coliform removal studied. • The highest log. inactivation of 4.69 was reported for pH = 3. • The 36.33% increment was recorded for inactivation logarithm as the content of H 2 O 2 increased from 5 to 35 mg/L. • The acidic ambient required 40 s, the lowest retention time, for coliform removal. [ABSTRACT FROM AUTHOR]