Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EXPERIMENTAL ANALYSIS OF THE DESALINATION PROCESS BY VACUUM ENHANCED AIR GAP MEMBRANE DISTILLATION IN A PILOT SYSTEM
Submission Author:
Ingrid Curcino , RJ
Co-Authors:
Ingrid Curcino, Thomás Rarian Padrão Costa, Guilherme Rosa , Abdul Orlando Cárdenas Gómez, Carolina Palma Naveira Cotta, Renato Machado Cotta
Presenter: Ingrid Curcino
doi://10.26678/ABCM.COBEM2023.COB2023-2145
Abstract
The present study aimed to experimentally investigate the effects of the operating parameters (factors): feed inlet temperature (56.6 °C - 73.4 °C), circulation flow rate (331.8 L/h - 668.2 L/h), and air gap manometric average pressure (-231.8 mbar -568.2 mbar) on the performance parameters: distillate flux, specific thermal energy consumption (SECth) and gain output ratio (GOR) of the membrane distillation process of a 35 g/L NaCl solution from a V-AGMD (Vacuum-enhanced Air Gap Membrane Distillation) spiral module, according to a central composite experimental design. The statistical analysis, for the studied operating range, indicated that the feed inlet temperature and the circulation flow rate are the most statistically significant parameters on the considered performance parameters. For the distillate flux, these two factors showed a positive and synergistic effect on the increase in distillate production. For the SECth, the lowest values of this parameter were obtained when increasing the feed inlet temperature and decreasing the circulation flow rate. While for the GOR, a reduction was observed when decreasing the feed inlet temperature and increasing the circulation flow rate. To preliminarily evaluate the ability to process solutions with higher concentrations, experiments were conducted with 70 g/L NaCl solution for four fixed operational conditions. These additional experiments indicated a reduction of 28.57% of the distillate flux (compared to the experiments with 38±5 g/L NaCl) and a rejection of 91% of the salt, indicating the ability to process high salt concentration waste solutions such as those from reverse osmosis.
Keywords
desalination, VAGMD, Distillate Flux, Specific Thermal Energy Consumption, Gain Output Ratio
