Regulation of Hydrogen Peroxide Dosage in a Heterogeneous Photo-Fenton Process

Abstract

In this work, a classical linear control approach for the peroxide (H2O2) dosage in a photo-Fenton process is presented as a suitable solution for improving the efficiency in the treatment of recalcitrant organic compounds that cannot be degraded by classical wastewater treatment processes like anaerobic digestion. Experiments were carried out to degrade Lignin, Melanoidin, and Gallic acid, which are typical recalcitrant organic compounds present in some kinds of effluents such as vinasses from the Tequila and Cachaça industries. Experiments were carried in Open-Loop mode for obtaining the degradation model for the three compounds in the form of a Transfer Function, and in Closed-Loop mode for controlling the concentration of each compound. First-order Transfer Functions were obtained using the reaction curve method, and then, based on these models, the parameters of Proportional Integral controllers were calculated using the direct synthesis method. In the Closed-Loop experiments, the Total Organic Carbon removal was 39% for lignin, 7% for melanoidin, and 29% for Gallic acid, which were greater than those obtained in the Open-Loop experiments.

Proceso foto-Fenton como una alternativa en la degradación de microplásticos de poliamida presentes en aguas residuales textiles

“…Debido a lo observado en la figura 28, para posteriores estudios se consideró la adición de H2O2 cada hora para evitar su consumo total en las primeras horas de reacción e impedir la disminución y/o supresión en la generación de ERO (especies reactivas de oxígeno o ROS en inglés; al adicionar el reactivo a lo largo del proceso, se impide su consumo debido al proceso de degradación así como por posibles reacciones secundarias no involucradas directamente con el proceso degradación con lo cual se puede lograr una mayor eficiencia de eliminación del contaminante [113].…”