Experimental analysis on the synergistic effect of combined use of ozone and UV radiation for the treatment of dairy industry wastewater

Abstract

The present study focused on the various advanced oxidation processes; Ozone, UV radiation, O 3 /H 2 O 2 , O 3 /UV, UV/H 2 O 2 and O 3 /UV/H 2 O 2 for treatability of dairy industry wastewater. With this aim, the trials were carried out in cylindrical reactor fortified with UV radiation and Ozone injection. Efficiency of the treatment process was evaluated considering Chemical Oxygen Demand (COD), lactose reduction and process parameters were determined to be reaction time, pH, circulation rate, and H 2 O 2 dosage. 32.5%, 35.2% , 25%, 83% COD and 40.6%, 43.6%, 38.2%, 80% lactose reduction efficiency were obtained under the operating conditions for O 3 /H 2 O 2 , O 3 /UV, UV/H 2 O 2 and O 3 /UV/H 2 O 2 processes, respectively. As per this outcome, UV/H 2 O 2 /O 3 process gave more than 65% of COD and 52.36% of lactose reduction efficiency than other hybrid processes. Optimum conditions for UV/H 2 O 2 /O 3 process (pH = 5, time = 180 mins, circulation rate = 50 mL/h and H 2 O 2 dosage of 0.5 mL) resulted in 88% of COD and 93.4% lactose reduction.

Feasibility of applying nonthermal plasma for dairy effluent treatment and optimization of process parameters

“…The AOP could generate strong oxidizing agents (such as hydrogen peroxide, hydroxyl radicals, atomic oxygen, oxygen and hydrogen peroxide), which will tend to remove more vulnerable pollutants present in effluent (Magureanu et al, 2008; Mejía‐Morales et al, 2020). AOP processess such as ozone, UV, fenton and catalytic process alone in the treatment of dairy effluent did not provide any possible results in treatment efficiency, which is reported in a previous study (Suresh et al, 2020). Electrical discharge plasma method is one of the AOP methods that intensively removes severe pollutants present in effluent (Yu et al, 2017).…”

Ozone Processing in the Dairy Sector: A review of applications, quality impact and implementation challenges

“…Studies have also observed its applications (as individual and hurdle techniques) for air purification or disinfection, biofilm inactivation, sterilization of dairy equipment, and sanitation of dairy farms and processing areas (Masotti et al, 2019;Suresh et al, 2021;Heacox, 2014). hazardous to consumers' health (Varga and Szigeti, 2016).…”

“…However, optimizing factors, such as ozone concentration and treatment time, is necessary for each product. Other than the inactivation treatment, additional applications of ozone treatment include de-sludge treatment, wastewater processing, food contact surface and air disinfection, biofilm elimination, and reduction of toxins and antibiotics in milk (Khoori et al, 2020;Masotti et al, 2019;Sert and Mercan, 2021b;Suresh et al, 2021).…”

“…In another study byMohammadi et al (2017), milk samples were exposed to gaseous ozone at an 80 mg/min rate within containers for varying durations: 0, 0.5, 1-, 2-, 5-, and 10-min. Results revealed that 5 min of treatment could reduce AF M1 by 50% Suresh et al (2021). investigated the combined application of ozone, UV irradiation, and H2O2 for treating wastewater in the dairy industry.…”