Diseño y construcción de un prototipo a nivel de laboratorio para la generación fotoelectroquímica de hidrógeno a partir de aguas residuales del proceso de teñido en la industria textil

Abstract

This monograph described the design and construction of a prototype at laboratory level for the production of hydrogen from a photoelectrochemical treatment employing wastewater of dyed process in the textile industry since a secondary review of recent research about the reuse of textile effluents through advanced oxidation processes (AOP’s). Hydrogen peroxide (H2O2) was used as catalyst at concentrations of 600 mg/L, 1200 mg/L and 1800 mg/L added to the start of each test in the water sample prepared with 200 mg/L of indigo dye known under the commercial name as "Iris # 36 (blue Indigo)”. 18 trials took place using a regulating voltage source (MW) of 2 (A)., where conditions of voltage applied were 6, 9 and 12 V for generating electrolysis, each of these tests with one (1 ) replica, in the presence of light in the black UV range emitted by four lamps Nippon of 6W and a dark phase (without the presence of light) for 30 minutes (time of operation defined by the experimental design of type 3x3x2) with the aim of studying the influence of these parameters in the production of hydrogen (H2) and physical changes; i.e. in discoloration and mineralization in the sample (turbidity, pH and conductivity of water). According to preliminary trials and pilot tests, analysis of variance (ANOVA) was generated, which allowed us to determine the influence of the variables that are part of the system in the production of hydrogen, making it possible to establish the best construction and operating conditions in the prototype. The best operating conditions of the prototype were an applied voltage of 12 volts, catalyst concentration (hydrogen peroxide) of 1200 mg/L and in the presence of light in the UV range. Finally, through an analysis of gas chromatography on a sample of gas product of the reactor operation, it was ascertained the presence and V/V concentration (38.3%) of hydrogen (H2) and was possible to establish the prototype energy efficiency through an energy balance in the system and assess the causes of the presence of other gases in the sample.