Abstract
Multiple-effect membrane distillation (MEMD) process, by using a hollow fiber-based AGMD module and an external heat exchanger, was studied to concentrate dilute sulfuric acid solution. Latent heat of distillate was in-situ recovered by directly heating the cold feed within the AGMD module of special configuration. Permeation flux (Jw) and performance ratio (PR) parameters were used to characterize the operation performance of MEMD process. PR value obtained in the MEMD process was much higher than that obtained in traditional and the other modified membrane distillation process. The effects of heated feed-in temperature, cold feed-in temperature, feed-in flow rate and feed-in concentration on the MEMD performance were experimentally investigated. The dilute sulfuric acid in 2wt.% could be concentrated up to about 40wt.% by using MEMD process. The maximum value of PR and Jw could reach 11.5 and 5.3L/m2h, respectively. When the feed concentration was up to 20wt.%, the value of PR and Jw could still be 4.9 and 1.9L/m2h, respectively. In a long-term stability test lasting for >30days, the electrical conductivity of the distillate was always less than 150μs/cm, which demonstrated that the performance of MEMD modules was kept in good condition.
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