Abstract
Diffusion dialysis (DD) equipped with anion exchange membranes (AEMs) is effectively used as a tool to recover acid (H + ) from various type of wasted acid solution. The aim of this study was to investigate the possibility of using DD process to recover sulfuric acid (H 2 SO 4 ) from the acidic wastewater of automotive battery plant. Numbers of experimental runs were conducted to optimize the operating conditions of such equipment, for example variation of feed flow and flow rate ratio (Q water /Q feed ). The results showed that H 2 SO 4 permeated well through the AEM, while metal ions were efficiently rejected. The recovery of H 2 SO 4 increased as the flow rate decreased. Approximately 84.5% of H 2 SO 4 could be recovered at 9.38 × 10 - 5 m 3 /h m 2 . Pb 2+ ion rejection was 69.5%. In addition, H 2 SO 4 recovery efficiency could be improved by increasing the flow rate ratio. At the highest flow rate ratio, DD could recover up to 90% of H 2 SO 4 while the lowest rejection of Pb 2+ ion (61%) was obtained. Also, the results from variation of flow rate ratio revealed that the optimum Q water /Q feed should be controlled around 1 to 1.2
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