Degradation of printing ink effluent and industrial predesign by UV/H2O2 treatment: A kinetic study

PAULA VITALE; PAMELA RAMOS; VIVIANA COLASURDO; MAXIMILIANO DELLETESSE; GASTÓN BARRETO

Cleaner Waste Systems

Elsevier

Año: 2023

2772-9125

Advanced Oxidation Technologies (AOTs) are effective for treating non-biodegradableorganic compounds. AOTs allow to degradation of these pollutants through non-selectiveattacks by highly reactive radicals. This work studies the reduction of the organic load inreal printing ink effluents. The Chemical Oxygen Demand (COD) reduction kinetics wasevaluated. The proposed treatment consists of irradiating the effluent in the presence ofH2O2 with temperature control and commercial UV light lamps (254 nm). Optimalconditions were tested on a pilot scale. The effluents were characterized before and afterthe treatment. The irradiation, temperature, and oxidizing agent effects were evaluated.The degradations were adjusted to pseudo-first-order kinetics up to 95% degradations. The optimal kdeg was 0.0138 min-1at the laboratory scale (98% COD reduction in 300min) and 0.0058 min-1at the pilot scale (90% COD reduction in 360 min).The degradation rate increased with temperature. Degradation occurred at a higher ratewith mean values of oxidant concentration for all temperatures (between 0.02 and 0.04mol L-1). The reaction rate increased proportionally to the irradiation, with this effectincreasing as the process temperature increased. The pilot prototype was scaled up on anindustrial scale, taking into account low-cost and easy-maintenance materials